EPS foam is a thermoplastic material. Each cubic meter of volume contains 3 to 6 million independent closed bubbles, and the volume of air contained is more than 98%. Since the thermal conductivity of air is very small, and It is enclosed in foam plastic and cannot convection, so EPS is a material with very excellent thermal insulation properties.
1. Definition of plastics
Plastics are polymer organic materials with resin as the main component, molded into a certain shape under a certain temperature and pressure, and able to maintain a certain shape at room temperature. Material.
Resin refers to an organic polymer that usually has a conversion or melting range when heated, has fluidity under the action of external force during conversion, and is solid, semi-solid or liquid at room temperature. It is the most basic plastic and also The most important ingredient. Broadly speaking, any polymer that is the basic material of plastics in the plastics industry can be called a resin.
2. Classification of plastics
There is currently no exact classification of plastics. The general classifications are as follows: 1. Thermoplastics are classified according to their physical and chemical properties: plastics that can be repeatedly heated, softened and cooled to harden within a specific temperature range. Such as polyethylene plastic and polyvinyl chloride plastic.
Thermosetting plastics: Plastics that can solidify into infusible and insoluble materials due to heat or other conditions. Such as phenolic plastics, epoxy plastics, etc.
2. Sort by plastic use
General plastics: -generally refers to plastics with large output, wide range of uses, good formability and low price. Such as polyethylene, polypropylene, polyvinyl chloride, etc.
Engineering plastics: - Generally refers to plastics that can withstand certain external forces, have good mechanical properties and dimensional stability, can still maintain their excellent properties at high and low temperatures, and can be used as engineering structural parts . Such as ABS, nylon, polyvinyl, etc.
Special plastics: -generally refers to plastics with special functions (such as heat resistance, self-lubricating, etc.) and used in special requirements. Such as fluoroplastics, silicone, etc.
3． According to the plastic molding method
Molded plastic: resin mixture for molding. Such as general thermosetting plastics.
Laminated plastic: refers to fiber fabrics impregnated with resin, which can be combined by lamination and hot pressing to become a whole material.
Injection, extrusion and blow molding plastics: -Generally refers to resin mixtures that can melt and flow at the barrel temperature and harden rapidly in the mold. Such as general thermoplastics.
Casting plastic: A liquid resin mixture that can be poured into a mold without pressure or with a little pressure and can harden into a product of a certain shape. Such as MC nylon.
Reaction injection molding compound: generally refers to liquid raw materials that are injected into the mold cavity under pressure to react and solidify to produce finished products. Such as polyurethane.
4. Divided by plastic semi-finished products and finished products
Molding powder: Also known as plastic powder, it is mainly obtained by fully mixing, pressing and crushing thermosetting resin (such as phenolic) and fillers. Such as phenolic plastic powder.
Reinforced plastic: A type of plastic that has reinforced materials and some mechanical properties are greatly improved compared to the original resin.
Foam plastic: a plastic with countless micropores inside the whole body.
Film: Generally refers to a flat and soft plastic product with a thickness of less than 0.25 mm.
3. Basic properties of plastics
1. Light weight and high specific strength. Plastic is light in weight. The density of general plastics is between 0.9~2.3 g/cm3, which is only 1/8~1/4 of steel and about 1/2 of aluminum. The density of various foam plastics is even lower, about Between 0.01~0.5 g/cm3. The strength calculated per unit mass is called specific strength. The specific strength of some reinforced plastics is close to or even exceeds that of steel. For example, alloy steel has a tensile strength per unit mass of 160 MPa, while glass fiber reinforced plastic can reach 170~400 MPa.
2. Excellent electrical insulation properties. Almost all plastics have excellent electrical insulation properties, such as minimal dielectric loss and excellent arc resistance, which are comparable to ceramics.
3． Excellent chemical stability. Generally, plastics have good corrosion resistance to chemicals such as acids and alkalis. In particular, polytetrafluoroethylene has better chemical corrosion resistance than gold, and can even withstand the corrosion of highly corrosive electrolytes such as "Aqua Regia". It is called " "The King of Plastic".
4. Good friction reduction and wear resistance. Most plastics have excellent friction-reducing, wear-resistant and self-lubricating properties. Many friction-resistant parts made of engineering plastics take advantage of these properties of plastics. When certain solid lubricants and fillers are added to wear-resistant plastics, their friction coefficients can be reduced or their wear-resistant properties can be further improved.
5. Light transmission and protective properties. Most plastics are available as transparent or translucent products, with polystyrene and acrylic plastics being as transparent as glass. The chemical name of organic glass is polymethylmethacrylate, which can be used as aviation glass material. Plastic films such as polyvinyl chloride, polyethylene, and polypropylene have good light transmission and warmth retention properties and are widely used as agricultural films. Plastic has a variety of protective properties, so it is often used as protective packaging products, such as plastic films, boxes, barrels, bottles, etc.
6. Excellent shock absorption and noise reduction performance.
Some plastics are flexible and elastic. When they are subjected to frequent mechanical impact and vibration from the outside world, viscous internal friction occurs inside, converting mechanical energy into thermal energy. Therefore, they are used as shock-absorbing and sound-absorbing materials in engineering. For example, bearings and teeth made of engineering plastics can reduce noise, and various foam plastics are widely used as excellent shock-absorbing and sound-absorbing materials.
The excellent properties of the above-mentioned plastics make it widely used in industrial and agricultural production and people's daily life; it has been used as a substitute for materials such as metal, glass, ceramics, wood and fiber in the past, and It has become an indispensable material for modern life and cutting-edge industry.
However, plastic also has shortcomings. For example, the heat resistance is worse than that of metals and other materials. Generally, plastics can only be used at temperatures below 100°C, and a few can be used at around 200°C. The thermal expansion coefficient of plastics is 3 to 10 times greater than that of metals, and it is easily affected by temperature changes that affect dimensional stability. Under the action of load, plastics will slowly produce viscous flow or deformation, that is, creep phenomenon; in addition, plastics will age under the influence of atmosphere, sunlight, long-term pressure or certain substances, causing performance deterioration. These shortcomings of plastic more or less affect or limit its application. However, with the development of the plastics industry and the in-depth research on plastic materials, these shortcomings are gradually being overcome, and novel plastics and various plastic composite materials with excellent properties are constantly emerging.
4. Uses of plastics
Plastics have been widely used in various fields such as agriculture, industry, construction, packaging, cutting-edge national defense industries, and people's daily lives.
Agriculture: A large amount of plastics are used to make mulch films, seedling-raising films, greenhouse films, drainage and irrigation pipes, fish nets, breeding floats, etc.
Industry: Plastics are widely used in the electrical and electronic industries to make insulation materials and packaging materials; in the machinery industry, plastics are used to make transmission gears, bearings, bearing bushes and many parts to replace metal products; in the chemical industry In the construction industry, plastics are used as pipes, various containers and other anti-corrosion materials; in the construction industry, they are used as doors and windows, stair handrails, floor tiles, ceilings, heat and sound insulation boards, wallpaper, downpipes and pit pipes, decorative panels and sanitary ware, etc.
In the defense industry and cutting-edge technology, whether it is conventional weapons, aircraft, ships, rockets, missiles, artificial satellites, spacecraft and atomic energy industries, plastics are indispensable materials. In people's daily life, plastics are widely used, such as plastic sandals, slippers, raincoats, handbags, children's toys, toothbrushes, soap dishes, thermos shells, etc. sold on the market. At present, it has also been widely used in various household appliances, such as televisions, cassette players, electric fans, washing machines, refrigerators, etc.
As a new type of packaging material, plastic has been widely used in the field of packaging, such as various hollow containers, injection molded containers (turnover boxes, containers, barrels, etc.), packaging films, woven bags, corrugated boxes , foam plastics, strapping ropes and packing tapes, etc.
5. The development history and current situation of the plastics industry
As early as the 19th century, people had been utilizing natural resins such as asphalt, rosin, amber, and shellac. In 1868, natural cellulose was nitrated and camphor was used as a plasticizer to create the world's first plastic variety, called celluloid. This began the history of human use of plastics. This began the history of human use of plastics. In 1909, the first synthetic plastic - phenolic plastic - appeared. In 1920, another synthetic plastic-aminoplastic (aniline formaldehyde plastic) was born. These two plastics played an active role in promoting the development of the electrical industry and instrument manufacturing industry at that time.
By the 1920s and 1930s, plastics such as alkyd resin, polyvinyl chloride, acrylics, polystyrene and polyamide appeared one after another. From the 1940s to the present, with the development of science, technology and industry, and the extensive development and utilization of petroleum resources, the plastics industry has developed rapidly. In terms of varieties, polyethylene, polypropylene, unsaturated polyester, fluoroplastics, epoxy resin, polyformaldehyde, polycarbonate, polyimide, etc. have appeared. Questions and Answers on Basic Knowledge of Waste Plastics
1. What is PPC plastic and how to identify it from its appearance?
Reply: PPC belongs to the PP category, and its full name is chlorinated polypropylene, which is used to manufacture daily necessities, electrical appliances, etc.
2. I am in the business of crushing waste plastics. ``What are the prices of waste plastics now (2004-11-9)?
Reply: Polypropylene (woven) Bag): 1200-1600 yuan/ton; polypropylene (basin and barrel material): 2100-2600 yuan/ton; polyethylene (soft material): 2300-3300 yuan/ton; polyethylene (hard material): 2700-3800 yuan / ton; polyvinyl chloride: 2500-3100 yuan / ton; foam: 2000-3300 yuan / ton; polyester (mineral water bottle): 5000-5800 yuan / ton; (Statement: The data provided are for reference only, please refer to Quotation date.)
3. What types of raw materials are used to produce HDPE gas pipes and water supply pipes?
Reply: The raw materials used to produce HDPE gas pipes and water supply pipes are PE80 and PE100
4. What material is PPN?
Reply: PPN is a type of polypropylene.
5. Which EVA has the best elasticity nowadays? <2004-11-21>? What brand? It should be made in China, and what soft polyvinyl chloride is used for injection molding? ?
Reply: Domestic EVA is basically produced in Beijing and is divided into extrusion grade type 14 (VA=14) general purpose film, type 18 (VA=18) foam, and injection grade Type 5 (VA=
5) food packaging film.
PVC is generally used for injection molding in types 5 and 3.
6. What is the Chinese name for PPU plastic?
Reply: PPU is thermoplastic polyurethane.
7. How to identify PVC plastic? Can PVC be regenerated and granulated? In what way? What is the current market situation of recycled PVC (2004-12-4)?
Reply: 1) Chinese name of PVC: polyvinyl chloride.
Identification by combustion method, softening or melting temperature range: 75~90°C; combustion situation: difficult to soften; combustion flame state: yellow above and green below; smoke after leaving the fire: extinguished after leaving the fire; odor : Pungent sour taste.
Solvent treatment and identification, solvents: tetrahydrofuran, cyclohexanone, methanone, dimethylformamide; non-solvents: methanol, acetone, heptane.
2) It can be regenerated and granulated.
3) The PVC recycling process mainly includes the following 6 steps:
(1) Pretreatment of PVC waste; (2) Selective dissolution in mixed solvents; (3) Separation of insoluble substances; (4) Precipitation of recycled PVC;
(5) Drying treatment; (6) Recovery and recycling of solvents
4) The current price is 8200 Around yuan/ton (2004-12-4).
8. What is the use of ethylene-propylene rubber?
Reply: Ethylene-propylene rubber includes ternary and binary ethylene-propylene rubber, general uses: all molded products; general hoses and heat-resistant hoses in automobiles; manufacturing electrical components; due to excellent extrusion performance, it can Mix with high viscosity rubber to improve extrudability.
9. What material are beverage bottle caps made of?
Reply: Generally made of PP (polypropylene).
10. Which manufacturer and model do LL0412 LL0501 LL0503 LL0504 and LL0505 represent?
Reply: LL means LLDPE; the last four digits represent the delivery time, the first two digits represent the year, and the last two digits represent the month. For example, LL0505 indicates that the trading product is LLDPE and the delivery month is May 2005. And so on.
11. Is the raw material of 5000S linear plastic?
Reply: 5000S is HDPE (high density polyethylene), not a linear plastic.
12. Find a plastic that can withstand high temperatures. About more than 200 degrees.
Reply: PTFE can meet the above requirements.
In addition, high-temperature resistant special engineering plastics include fluoroplastics, silicone resins, polyetherimines, polyetheretherketones, liquid crystal polymers, etc. Modified nylon can withstand high temperatures above 250 degrees.
13. Is ABS a modified polystyrene?
Reply: ABS is acrylonitrile-butadiene-styrene polymer and does not belong to modified polystyrene. Modified polystyrene belongs to PS.
14. What is the difference between high-pressure polyethylene glycol and low-pressure polyethylene glycol?
Reply:
High-pressure polyethylene (HPPE) is low-density polyethylene (LDPE);
Low-pressure polyethylene (LPPE) is high-density polyethylene ( HDPE).
15. I want to set up a recycled plastic pellet factory, but I don’t know what materials those woven bags are made of, such as PP, ABS, etc.
Reply:
PP is generally used to make woven bags; ABS is more rigid and is generally used to make shells, parts, etc.
16. What type of plastic raw material is Noryl SE1 GFN3 and what is its name?
What type of plastic material is Lexan 940 and what is its name? How much does it cost?
Reply:
Lexan 940 is a PC produced by General Electric Plastics Company in the United States, with a market price of about 34,000. Noryl SE1
GFN3J is also made by General Electric, PPO, The market price is around 35,000.
17. What is the proportion of ABS?
Reply:
The density of ABS is about 1.05 grams per cubic centimeter, slightly heavier than water, and has the characteristics of toughness, hardness and rigidity.
18. What type of plastic are MSRESIN, ATRATE and TYPE? What is their name? How much is the price? What is the manufacturer?
Reply:
MSRESIN is MS resin, which is a commonly used transparent plastic raw material. It is generally injection molded and extruded. Its transparency is close to PMMA and is used for optical components/toys/lampshades and lighting. /OA accessories/food containers/home appliances/building materials, etc.; mostly imported from Japan and Taiwan, with quotations ranging from 15,500 to 18,300.
19. What is the English code for scrap acrylic? What is the approximate price of scrap now?
Reply:
ACRYLIC is a special kind of organic glass.
PMMA is commonly known as organic glass, also known as acrylic or acrylic. Hong Kong people often call it acrylic. It is an important thermoplastic that was developed earlier and has good transparency, chemical stability and Weather-resistant, easy to dye, easy to process, beautiful in appearance, it is widely used in the construction industry.
The price of transparent acrylic scrap is about 10,000; as the new year is approaching, the acrylic scrap market is out of stock.
20. What is the difference in performance between PS material and ABS material?
Reply:
PS plastic (polystyrene), material properties: electrical insulation (especially Excellent high-frequency insulation, colorless and transparent, light transmittance second only to organic glass, coloring, water resistance, good chemical stability, average strength, but brittle, prone to stress cracking, not resistant to benzene, gasoline, etc. Organic solvent. Suitable for making insulating transparent parts, decorative parts, chemical instruments, optical instruments and other parts. Molding properties: 1. Amorphous material, low moisture absorption, does not need to be fully dried, is not easy to decompose, but has a large thermal expansion coefficient and is prone to internal stress. .It has good fluidity and can be molded by screw or plunger injection machines. 2. It is suitable to use high material temperature, high mold temperature and low injection pressure. Extending the injection time will help reduce internal stress and prevent shrinkage and deformation. 3. Available Various forms of gates. The gates are arc-connected to the plastic parts to avoid damaging the plastic parts when removing the gate. The demoulding slope is large and the ejection is uniform. The wall thickness of the plastic parts is uniform. It is best not to have inserts. If there are inserts, The parts should be preheated. ABS (acrylonitrile-butadiene-styrene) is a light yellow granular or bead-shaped opaque resin that is non-toxic, odorless and has low water absorption. It has excellent physical and mechanical properties, excellent low-temperature impact resistance, excellent electrical properties, wear resistance, dimensional stability, chemical resistance, and dyeability. Easy to process and shape. ABS is resistant to water, inorganic salts, alkali and acids, insoluble in most alcohols and hydrocarbon solvents, and easily soluble in aldehydes, ketones, esters and some chlorinated hydrocarbons. The disadvantages of ABS are that it is flammable, has a low heat distortion temperature, and has poor weather resistance. Combustion characteristics: flammable; continues to burn away from fire; strong flame, thick black smoke; softening, foaming; acrylonitrile smell. Solubility: Soluble solvent: methylene chloride; Insoluble solvent: alcohols, aliphatic hydrocarbons, water. Application: automotive industry, mechanical equipment, electronic appliances, etc.
21. What PP material is used in syringes? Can it be recycled? How much does it cost per ton?
Reply:
The PP material used in syringes is a The kind is called random polypropylene, which can be recycled. The current price includes tax is about 13,000.
Waste syringes are medical waste and should be used to avoid harm.
Some netizens recommend South Korea’s RP340R (MI25) or 370Y (MI18); and strongly recommend not to use recycled materials because it can easily cause medical accidents.
22. What are the uses, prices and processing technologies of waste PET?
Reply:
Uses: Recycled PET is mainly used for fibers, sheets, non-food packaging bottles, etc. The developed uses include: building materials, food packaging and containers, etc., Japan The company has used polymer alloy improvement technology to process recycled PET into powder coatings with better performance than those made with new PET materials. Price: No public quotation was found.
Basically, it is a one-by-one negotiation.
Treatment process: Teijin Corporation of Japan has developed a recycling method for DMT (dimethyl terephthalate) and EG (ethylene glycol) from waste PET bottles. The waste PET bottles are first crushed. It is washed and then dissolved in EG. Under the boiling point temperature of EG and a pressure of 0.1MPa, PET is depolymerized to generate bis-hydroxyethyl terephthalate (BHET). After filtering, the filter residue and additives are removed, and BHET reacts with methanol. At the boiling point of methanol and a pressure of 0.1MPa, DMT and EG are generated through transesterification reaction. After distillation, DMT and EG are separated, and then the DMT is refined through the recrystallization process; EG is purified through distillation, and the methanol can be recycled. The purity of the recovered DMT and EG reaches 99.99%, and the production cost is comparable to the cost of the general DMT and EG methods. DMT can be converted into pure TPA (terephthalic acid), which is used to make bottle-grade PET resin. The recycling device can generate about 10% of the raw materials used by the company to produce resin.
23. How are waste plastics classified?
Reply:
Commonly used waste plastic types are roughly divided into PE, PP, PVC, PET, EPS, ABS, PA, etc. Among them, PE includes plastic greenhouse materials, industrial packaging films, lactic acid Beverage bottles, dishwashing liquid bottles, etc.; PP includes woven bags, packing tapes, strapping ropes, some car bumpers, etc., PVC includes plastic door and window profiles, pipes, etc.; PET includes tea beverage bottles such as Coke, Sprite, etc.; EPS is commonly known as foam plastics. .
24. The chemical name of waste plastics, and what plastic products can be made after various waste plastics are made into particles.
For example, what can be done after mineral water bottles are made into particles? Chemical name?
What can be done after woven bags are made into granules?
Reply:
Thermoplastic plastic products can be granulated again after recycling, which is called regeneration Plastic, its name is ** recycled material.
Theoretically, its uses are slightly narrower than new materials. Because of the level of recycling technology and the specific uses of finished products: such as food packaging, medical treatment, etc. (To avoid harm to the human body, such products generally do not use recycled materials).
However, the advanced recycling processing technology and strict recycling systems in developed countries have made the performance of recycled materials close to that of new materials, and even new uses can be developed through recycling, synthesis, etc. Domestic technology is lagging behind, and so far, no enterprise standards or national standards have been issued for recycled plastic particles. Therefore, the quality of plastic recycled materials varies, and its use depends on its specific technical indicators.
25. What is the English code for organic plastic (acrylic)?
Reply: ACRYLIC is a special kind of organic glass, referred to as PMMA
26. What is the scientific name of nylon?
Reply:
Nylon is also called PA or polyamide.
27. What kind of plastic are the infusion tubes used in hospitals made of?
Reply: PVC, PE
28. What are the detailed uses of polytetrafluoroethylene?
Reply:
Polytetrafluoroethylene (PTFE), commonly known as the king of plastics, is the fluoroplastic variety with the largest output and usage, accounting for about 70% of the entire fluoroplastics production, and is used in the chemical industry , machinery, electrical appliances, construction, electronics, automobiles and many other fields
29. What is the information related to PPR? Aluminum-plastic PPR composite pipe and non-embroidered PPR composite pipe.
Reply:
It is out of stock in the near future, so there is no quotation yet.
PPR pipe products are suitable for living, sanitary drinking water and hot water heating systems in industrial and civil buildings. They are upgraded products that replace copper pipes and galvanized pipes. They can be used for: 1. Residential hot and cold water systems 2 Purified water and pure water pipelines 3 Industrial water and chemical substance transportation and discharge 4 Hot water circulation system 5 Compressed air pipes 6 Food and beverage production and transportation systems 7 Other industrial and agricultural pipes.
Steel-plastic composite pipe is an environmentally friendly ideal pipe widely used in urban water supply, natural gas, petrochemical and other fields. Steel-plastic composite pipe has the dual advantages of metal and plastic; it is resistant to high temperature, high pressure, and corrosion; the inner wall of the pipe is smooth, has low resistance, does not scale, is non-toxic, non-polluting, anti-static, heat-insulating, and easy to cut and process.
Application scope of aluminum-plastic composite pipes:
Industry: various instruments, shielding conduits, insulating conduits, and transportation pipelines for various gas and liquid media.
Construction industry: indoor cold, hot and gas pipes in buildings, hot and cold pipes for solar water heaters, low-temperature radiation, and heating pipes.
Agriculture: pipes for nurseries, orchards, garden sprinkler irrigation pipes and other irrigation projects.
Public services: hot and cold water pipes in hotels and restaurants, hospital oxygen pipes, food pipes, various air conditioner pipes, and various pipes on ships.
30. What kind of plastic is used for springs?
Reply:
The main requirements for the performance of spring plastics: 1. The deformation energy V value should be large (that is, the spring modulus E value should be small) 2. Strength, especially fatigue strength 3. It is easy to process and form. The deformation energy V value of thermosetting fiber-reinforced plastic (FRP) is larger than that of ordinary metals and can be compared with spring steel. Its strength is high and the stress is distributed in one direction, making it an ideal material for manufacturing leaf springs.
31. Characteristics, main uses and differences of each label of ABS, PS, PP, PE and other materials.
Reply:
ABS has good rigidity, high impact strength, heat resistance, low temperature resistance, chemical resistance, excellent mechanical strength and electrical properties, easy processing, and dimensional stability during processing It has good surface gloss, is easy to paint and color, and can also be used for secondary processing such as metal spraying, electroplating, welding and bonding.
Main applications: automobiles, appliances, electronics/electrical appliances, building materials, ABS alloy/*** hybrid PS has excellent electrical insulation (especially high-frequency insulation), colorless and transparent, light transmittance second only to organic glass, coloring and water resistance It has good chemical stability, average strength, but is brittle and prone to stress cracking. It is not resistant to benzene, gasoline and other organic solvents. It is suitable for making insulating transparent parts, decorative parts, chemical instruments, optical instruments and other parts. Basic PE It is divided into three major categories, namely high-pressure low-density polyethylene (LDPE), high-density polyethylene (HDPE) and linear low-density polyethylene (LLDPE). Films are its main processed products, followed by sheets and coatings, hollow containers such as bottles, cans, barrels and other various injection molding and blow molding products, pipes and wires, cable insulation and sheathing, etc. Mainly used in packaging, agriculture and transportation sectors.
PP is cheap, light, has good processability and is widely used. The development of catalysts and new processes has further promoted the expansion of application fields. Some people say: "As long as the material of a product is replaced by plastic, then this products have the potential to use polypropylene." Main uses: woven bags, tarpaulins, durable consumer goods: such as cars, home appliances and carpets, etc.
32. What types of commonly used PC products are there? What kind of plastic are VCD discs and outer packaging boxes made of?
Reply:
Polycarbonate (PC) material has the advantages of light weight, transparency, high strength, earthquake resistance and good processing performance. In the course of more than 50 years of development, its application fields Keep expanding.
The application of PC products has penetrated into industries such as automobiles, construction, medicine, clothing, etc. PC car lights, PC car sunroofs, light wave conductor optical fibers in automobile communication systems, transparent ceiling roofs, PC Boards, PC injection tubes, in addition, some new fields such as self-lighting systems at the bottom of swimming pools, solar energy collection systems, high-definition large TV screens, chip-marked fibers in textiles that can identify fabric materials are indispensable for PC materials. , PC products are making contributions to all walks of life, and their application potential will be further developed.
Optical disc is the most familiar PC application field, and it is developing in the direction of large capacity. The storage capacity of new DVD is expected to reach 100 billion bytes.
33. Performance of PC
Reply:
High impact strength, dimensionally stable model, colorless and transparent, good colorability, electrical insulation and corrosion resistance It has good properties and wear resistance, but has poor lubricity, tendency to stress cracking, easy hydrolysis at high temperatures, and poor compatibility with other resins.
34. Which places are the largest recycled plastic markets in my country?
Reply:
Generally, in areas where the trading of new materials is more active, the trading of recycled materials is also more active, such as Yuyao, Guangdong, Shandong and other places.
35. What is the common name of ACETAL (acetal diethyldehyde)? How is the performance?
Reply:
ACETAL is acetal, acetal diethanol; commonly known as plastic steel (known as plastic steel in Hong Kong and Taiwan); it can be used as buckles for outdoor products, etc., with high Hard and moisture-proof, it can be used in cold or dry environments.
36. What are the plastic materials that do not deform at 180 degrees?
Reply:
Aromatic nylon can withstand high temperatures up to 260°C, and there are also fluoroplastics that can withstand such high temperatures.
37. Is PP powder a universal material? Is injection molding as versatile as wire drawing? Can it replace PP material? What's the market price? Reply:
PP plastics are all general-purpose plastics. As long as the equipment allows, powder and granular materials can be substituted for each other. The current market price is around 10,200.
38. How do you analyze the daily oil prices of Brent, WTI, and OPEC? At the same time, how do you analyze the level of oil futures to determine whether the trend of plastics will be high or low now and in the future?
Reply:
Due to the cost push principle: crude oil - naphtha - ethylene - polyethylene - plastic products, the price of crude oil is consistent with the general trend of plastics (in the short term deviation is also normal), but in theory this impact should have a certain hysteresis effect, and is not as sensitive as the current domestic plastics market. The current international oil price mainly affects the domestic plastics market through mentality and a herd mentality.
When the market returns to rationality, the supply and demand for plastic itself will have a greater impact on market prices