Category: Education/Academic/Examination>>Thesis Report
Problem Description:
For example, the appliances I buy have foam, but I don’t know anyone who recycles them How to dispose of them
Analysis:
Waste plastics come in various varieties and shapes. Many recycling methods have been created in practice. Here are some examples for reference.
1. Addition of film
Film is a major category of plastic products, with many types and generally short service life. It is one of the main types of recycling. Introducing examples according to usage and form.
(1) Agricultural films. Agricultural films mainly include mulching films and shed films. Mulch films are mainly PE films, and shed molds include PE, PE/EVA, and PVC films. When recycling, PE and To distinguish PVC films, agricultural films are generally dirty and often contain soil, sand, grass roots, iron nails, iron wires, etc. Iron impurities must be removed and cleaned. The main recycling method is granulation. If so, use artificial When sorting and cleaning conditions are met, the cleaned and dried waste film can be directly used to produce plastic products by hot extrusion, such as basins, barrels, plastic flanges, etc.
The uses of waste agricultural film recycled pellets are as follows
1. PE recycled pellets. PE recycled pellets can be used to produce agricultural film, and can also be used to make fertilizer packaging bags and garbage bags. , agricultural recycled water pipes, fences, tree supports, pots, barrels, garbage bins, geotechnical materials, etc.
2. PVC recycled pellets. PVC recycled pellets can be used to produce heavy packaging bags, agricultural water pipes, shoe soles, and other packaging films. The materials of packaging films include cellophane (cellophane), PE, PVC, PP, EVA, PVDC, PA, PET and various composite films. A single-layer packaging film of one material, after sorting and cleaning, can be directly made into plastic products like agricultural film or granulated into various products. Composite films include composite films of different plastics and films made of plastic, paper, aluminum foil, and other materials. The regeneration process after recycling is more complicated, such as: multi-layer plastic composite films. Multi-layer plastic composite films include PE/PP, PE /EVA/PE, PE/adhesive/PA/adhesive/PE, PP/PVDC, etc., before recycling, different materials must first be separated. Separation can be done by solvent separation.
Paper-plastic composite film, paper-plastic composite film needs to be separated from paper and plastic before recycling. This is also the method of paper-plastic composite separation. The separation equipment is a chromium-plated hollow barrel with electric heating. There is a hollow cylinder with blades inside the barrel. The barrel and the hollow cylinder rotate in opposite directions. The crushed paper-plastic mixture is added to the barrel. The plastic on the heated mixture in the barrel melts and comes out from the lower part of the barrel. Material, the air in the hollow cylinder takes away the exhaust gas.
Aluminum-plastic composite film, including BOPP/aluminum, PE/aluminum, etc., is used for various food packaging. The used aluminum-plastic composite flexible packaging bag is actually a kind of mixed waste, which can be recycled More difficult. The treatment method abroad is mainly incineration to recover heat. In China, there are methods of incineration to extract aluminum and crushing and adding fillers to produce low-grade crude products, but the effect is not very satisfactory. Here is an example of using the conductivity of aluminum to manufacture antistatic functional materials. The process is as follows: aluminum-plastic composite waste - cleaning - crushing - sieving - pellet - aluminum powder - additives - extrusion - semi-finished product - extrusion - finished product . The aluminum-plastic composite waste is cleaned, crushed and screened through a 10-day sieve, and then pelletized. This process can use the pelletizer of Beijing Plastic Machinery Factory. The pellet process conditions are water spray: 0.8 liters of 95-degree water, feeding time: 3 minutes; air extraction time: 5 minutes, crushing time: 10 minutes, 15 kilograms processed each time. The pelletized material is then extruded with an extruder to form a semi-finished product. This semi-finished product is then added with 20% aluminum powder, flame retardants, compatibilizers and other additives, and then the finished product is obtained by extruding and selecting particles. As conductive material.
3. PET film, in the plastics industry, PET is mainly used as film and bottles, while the film can be used as packaging, decoration, tape base or capacitor insulation, PET sheets are also used as photographic film base, PET is also widely used in fiber, film and fiber The physical viscosity of PET is higher than that of bottle PET paper. So recycling is slightly different.
The scraps produced by PET film and fiber production plants can be used to wait for polyester/epoxy resin powder coatings. Generally, the relative molecular mass of these scraps is about 20,000, the melting point is above 260 degrees, and it has a single composition. Linear PET. Alcoholyze such scraps with polyol at 250 to 260 degrees to obtain low melting point oligomer polyester with a relative molecular weight of about 2000 to 5000. The oligomer polyester is polycondensed by adding dibasic acid anhydride and esterifying agent at 200 to 220 degrees to obtain a product with an acid value of about 3.05 mgKOH/g, a softening point of about 85 to 105 degrees, and a glass transition temperature of less than or equal to 50 degrees. This product Used to make polyester/epoxy resin powder coatings.
Polyester formula for polyester/epoxy resin powder coating
Raw material dosage
PET scraps 723.6g Dibasic acid anhydride 0.98mol < /p>
Diol 1.71mol Catalyst 0.1%
PET industrial waste can also be used as adhesive. Japan's Osaka Municipal Industrial Research Institute and Fuji Photo Film Company reacted PET industrial waste with glycerin to make adhesives for metal bonding. PET industrial waste is modified with adipic acid or ethylene glycol, and hot melt adhesive can also be produced, which can be used for bonding flexible materials such as cloth, leather, paper, plastic, aluminum, etc. Performance of polyester/epoxy resin powder coating
Indicator name technical standard Indicator name technical standard
Appearance is flat and smooth, with a slight orange peel gloss allowed/% >85
Fineness/mesh>180 Flexibility/mn 1
Curing time/(min/oc) 20/180 Hardness>2H
Horizontal flow/[mm(oc .min)] >25/180—5 Moisture resistance (40 oc+-2 oc, RH95%+_3%)/d 21
Acid leaching resistance of 25% H2SO4 at room temperature for 90 days, the coating film is intact
< p> Impact strength/kN/cm 50 Resistant to alkali immersion in 25% NaOH4 and the coating film is intact for 90 days at room temperatureAdhesion (level) 1-2 Resistant to salt water immersion in 10NaCL and the coating film is intact for 90 days at room temperature
>Unsaturated polyester can be produced by reacting waste PET films, sheets or fibers with propylene glycol, styrene, glycerin, phthalic anhydride, maleic anhydride, hydroquinone and catalysts. To make artificial marble. For the recycling method of waste PET film, you can also refer to the recycling method of PET bottles.
Bonding properties of polyester hot melt adhesive
Material bonding strength Material bonding strength
Shear strength/MPa Tear strength (N/25mm ) Shear strength/MPa Tear strength/(N/25mm)
Cotton (plain weave) 3.07① 2.10①
Polyester 2.93① 112.0 PET film 3 ．05① Tear
Leather (haired) 2.27② 100 Aluminum foil 12.90④ 126
Tape (for raincoat) 2.83① ---- 8.83①
Canvas (for tent use) 7.60 73.0 Aluminum foil 20.13 133
Kraft paper 1.93③ 12.2 Tinplate 11.85 70.3
① Material breakage value, the bonded part is not cracked ② The skin layer is peeled off ③ The paper layer is torn ④ The test value using the board as the sample
2. Recycling of bottles
Bottles include soft drink bottles, mineral water bottles, liquid food bottles, cosmetic bottles, etc. The materials used include polyethylene (PE), polyvinyl chloride (PVC), polyvinyl chloride (PVC), Ethylene phthalate (polyester) (PET), etc. Usually mineral water bottles are made of PVC or PET, carbonated drink bottles are made of PET, refreshing beverage bottles, liquid food bottles are made of PVC, PE, detergent bottles, cosmetic bottles, milk bottles, lactic acid bacteria drinks are mostly made of PE.
The various recycled bottles are generally sorted manually and then recycled according to different materials. Currently, there are many technologies and equipment used for the recycling of various bottles
(1) Recycling of PET bottles. PET bottles are widely used in carbonated drinks such as Coca-Cola, Pepsi-Cola, and Sprite. Currently, most of them are composed of PET bottles and HDPE bottle bottoms. The bottle cap material is HDPE, and the trademark is biaxially oriented polyethylene. Propylene (BOPP) film is adhered to the bottle body using EVA adhesive. The way to reuse polyester bottles after recycling is through regeneration and granulation. Alcoholysis and other methods. No matter which method is used, the polyester bottle must first be separated from other bottles, and the polyester bottle body must be separated from the bottom of the bottle.
① Separation: The mixed addition bottles enter the crusher through the conveyor belt for crushing, and then undergo density separation.
② Regeneration and granulation: Extruder can be used for regeneration and granulation. The separated PET scraps are extruded and granulated into pellets through an extruder. In order to avoid water absorption during extrusion and a decrease in physical viscosity, they should be dried before extrusion. The uses of PET pellets are as follows:
a. Re-manufacture PET bottles. Recycled pellets cannot be used in direct contact with food, but can be used in the middle layer of three-layer PET bottles to make carbonated beverage bottles. .
b. Spinning to make fiber, recycled PET material can be used to spin to make fiber, which can be used as pillow core, mattress, sleeping bag, felt, etc.
c. Glass fiber reinforced material. Glass fiber reinforced recycled PET has good heat resistance and mechanical strength and can be used to make automobile parts, such as heat-resistant automobile wheel covers. Its thermal distortion temperature Up to 240 degrees. The bending elastic modulus is 9500MPa, the bending strength is 214 MPa, and the impact strength is 15kf/m2.
d. Blending modification, recycled PET material can be blended with other polymers to produce Various modified materials, such as mixed with PE***, can obtain PET*** mixture with improved impact properties. PE:PET is (10~50): (90~50): if a small amount of polypropylene is added, ***The dimensional stability of the mixture can be significantly improved. Since the polarity of PE and PET is quite different, compatibility treatment is required when mixing. Generally, the compatibility is improved through graft modification of polyolefin.
③ Alcoholysis: PET waste is alcoholyzed in the presence of an alkaline catalyst, and then dibasic acid anhydride and other polycondensation are added to obtain a product with an acid value greater than 12. After dilution, filtering, and adding an appropriate amount of catalyst, it can be made Get alkyd resin paint. See the table below for the recipe. Reaction temperature 80~85 degrees, reaction 4~5h
PET waste alcoholysis coating formula
Material addition amount/% Material addition amount/%
PET Material 25 N-hydroxymethylacrylamide 2
Triethylene glycol 23 nonionic emulsifier 0.9
Dibutyl phthalate 18 anionic emulsifier Agent 1.1
Vinyl acetate 24 persulfate initiator 1.4~1.6
a-methylstyrene 7 water 130
Methacrylic acid 1
Another example is to react PET waste with polyol at 220~250oc, and then solvate to obtain an insulating paint with a three-dimensional network structure. The quality meets the requirements of GB6109 ③ Others, PET bottles are also Can be used to make plasticizer: 2-ethylhexyl terephthalate (DOTP), its plasticizing effect is similar to dioctyl phthalate (DOP), and is slightly better than DOP in terms of electrical properties and low-temperature flexibility. Waste PET bottles can also be made into adhesives and unsaturated polyester in a similar way to waste PET films
(2) Addition of PVC bottles, the PVC recycling process is as follows.
PVC bottles are cleaned, sorted, crushed and regenerated
PVC bottles are first cleaned with steam and alkali solution to remove the trademarks, and then mechanically and manually sorted. The final PVC bottles are crushed twice, and finally a powdery regenerated product with a fineness of 500~1200μm is obtained, with a purity of up to 99.98%
(3) The addition of PE bottles, the PE used as bottle material is Mainly HDPE, including dairy product bottles, food bottles, cosmetic bottles, etc. After sorting and cleaning, the HDPE recycled bottles can be crushed and selected for the following uses:
① Use colored Coke bottle base< /p>
② Used to extrude the middle core layer of pipes
③ Filled with talcum powder or glass fiber to make flower tea cups or injection molded products.
④ Composite with this fiber and used as artificial wood. Because wood fiber has poor compatibility with HDPE, it is necessary to add appropriate coupling agent or use activated wood fiber.
⑤ To make artificial gravel, crush HDPE bottles into fine pieces or granules, and then stick the gravel shape made of yarn, metal, etc. on the surface, and then mix it with concrete or asphalt for civil engineering Building materials.
3. Recycling of polystyrene foam
Polystyrene foam can be effectively molded into polystyrene beads. Foam plastics used for packaging of household appliances or frozen food packaging; there are also a few instant noodle bowls made of expandable polystyrene beads. These plastic products are bulky and cost a lot of tuition and fees, and their recycling receives special attention in China.
The main ways of recycling polystyrene foam include: granulating after volume reduction, crushing and using as various filling materials, cracking to produce oil or recycling styrene and others.
(1) After volume reduction and granulation, polystyrene foam can be melted, extruded and granulated to make recycled pellets. However, it is bulky and difficult to transport, so it usually needs volume reduction before recycling. Methods include mechanical method, solvent method and heating method.
(2) After crushing, it can be used as filler. Polystyrene foam products can be used as filler after being crushed to make various products. Such as ① Re-molding into foam plastic products
② Concrete composite panel products
③ Gypsum sandwich bricks
④ Used as asphalt reinforcement
⑤ Used as soil modifier
(3) Cracking to produce oil or recycling styrene, the device for cracking waste polystyrene foam plastic to produce oil is as follows
Waste Polystyrene foam pretreatment, heat treatment, volume reduction, catalytic cracking, distillation of styrene
(4) Others, waste polystyrene foam can be used to manufacture coatings and adhesives, etc.
① Coating, expandable polystyrene foam can be made into paint after crushing it and adding appropriate solvent. The process flow is as follows
Filler, colorant
PS, ethyl acetate back grinding Over-grinding and processing
Ethanol, dibutyl ester, cyclic milling filter reaction kettle grinding filter product
Oxygen resin, nitrile rubber kettle
② Bonding Agent, a mixed solvent of esters and benzene, adding waste polystyrene foam, anti-sedimentant, plasticizer, phenolic resin and other additives, it can be made into coatings for cement, steel and wood.
③ Brominate to produce brominated polystyrene flame retardant, using aluminum dichloride as a catalyst to make electrophilic substitution reaction between waste polystyrene and bromine to produce brominated polystyrene, containing bromine The amount can reach 60% to 70% and is used as a flame retardant for thermoplastics such as PET, ABS, and nylon. Brominated polystyrene is cheap, has good flame retardant effect and thermal stability. A dosage of 5 parts (mass) can have obvious flame retardant effect. Used together with antimony trioxide, it has a good flame retardant synergistic effect.
4. Additional charges for plastic footwear
Plastic footwear includes foamed and non-foamed sandals, as well as various plastic soles. The main materials include PVC, PE, PE/EVA, etc. Before collecting and recycling, it must first be sorted. Generally, manual sorting is the main method. After sorting, various waste shoes are regenerated according to the type of material and used.
(1) The additional collection of PVC plastic footwear. The additional collection of PVC plastic footwear mainly adopts the method of re-granulation. The sorted and washed waste PVC shoe material is put on the double-roller refining machine. Mixing, at this time, various refined additives are added according to the specific source and quality of the waste material, and after thorough mixing, the waste material is pelletized, cut into granules, and extruded through filtration to obtain recycled pellets.
The addition of auxiliary additives depends on the condition of the waste PVC shoe material. If it is leftover material from the factory, there is no need to add additives. It only needs to be mixed with new material in a certain proportion, including the leftover material and new material. The ratio can reach 1:1 or even higher. For foamed PVC waste, the mixing temperature needs to be appropriately increased and the mixing time also needs to be extended to drive out bubbles.
For poor-quality waste PVC shoe materials, various additives must be added, and various impurities must be removed through extrusion filtration. The formula for determining the amount of plasticizer added is:
b C1K1 C2K2 b
X=A (A1 +A2 +…) × (1+ )
10b 10 C1K1 10 C2K2 100
A=A1+A2 + …
Where: X—— The mass of plasticizer to be added to the recycled ingredients, kg
A——The total mass of waste plastics in the recycled ingredients, kg
A1 A2...——The mass of a certain kind of waste plastics recycled and processed, kg
b——The mass ratio of plasticizer required in recycled raw materials, %
C1 C2...——The mass ratio of plasticizer in the original formula of a certain waste plastic recycled and processed, %
p>
K1 K2…——The retention coefficient of plasticizer of certain waste plastics recycled and processed, usually determined based on experience.
Other additives, such as stabilizers, lubricants, etc., can in principle be determined using the above formulas and experience.
Waste PVC agricultural film and industrial film are often used as PVC recycled materials for shoemaking. Generally, the content of plasticizer in PVC film is about 42 parts. Here are some practical ingredients (using factory PVC foam) Ratio of scraps).
Formula ①
10 kg of factory PVC foam shoe material scraps 25 kg of waste PVC film
10 kg of new material powder
New The formula of the powder material is as follows:.
PVC (XO-4) 100 (parts by mass) dibasic lead sulfate 5.0
DOP 35 dibasic lead phosphite 2.0
DBP 60 medium yellow pulp 1.0
Mixed ester 25 iron oxide red pulp 2.2
Barium stearate 3.5 carbon black pulp 0.14
Formula ②
p>30 kg of factory PVC foam scraps and 10 kg of new material powder
5 kg of waste PVC film
The formula of new material powder is as follows.
PVC (XO-4) 100 (mass parts) DOP 25
Tribasic lead sulfate (powder) 0.5 DBP 30
Barium stearate 0.7
(2) Recycling of PE and PE/EVA shoe materials. PE and PE/EVA shoe materials are usually foam products. Factory scraps are mainly crushed and then granulated. Added to new materials, waste materials collected from society can mainly be used for agricultural tools, fences, etc.
5. Recycling of polyurethane
There are many types of polyurethane, and its products include soft and hard foam plastics, thermoplastic elastic and industrial products, etc., which are widely used in automobiles, home appliances, chemicals, daily necessities and other fields. Recycling can be carried out separately by type.
(1) Recycling of polyurethane flexible foam plastics. Polyurethane flexible foam plastics can be recycled mechanically. There are ① Coated with adhesive, compression molding and reuse ② Low temperature recycling as filler
(2) Recycling of reaction injection molded polyurethane ① Used as filler for glass fiber reinforced RIM-PUR. ②Mixed with polypropylene.
Flexible PP elastomer can be produced from waste RIM-PUR crushed materials and PP** concrete. Methods include 1, activation treatment 2, adding compatibilizer 3, and adding inorganic fillers. ③ Direct compression molding recycling RIM-PUR recycled material can be directly compressed into various products after crushing and grinding, without adding adhesives. ④ Partial thermal degradation recycling, heat the RIM-PUR waste in a kneader to a certain degree and knead it, so that part of the PU molecular chain in the material is broken and degraded, and the material changes from hard to soft plastic state. At this time, isocyanate is added to make the material The moderately degraded PU molecular chains are cross-linked to produce hard materials, which are used in automobile tool boxes and other applications that require strength and high hardness.
6. Recycling of phenolic plastics
The main fillers for waste phenolic plastics are added to phenolic plastics. The overall properties of materials added with waste phenolic plastics have declined, especially the unnotched impact strength, even if the added amount is only 5 %, the unnotched impact strength can even be reduced by 35%. The added particles of waste phenolic plastic have an impact on the performance. Usually, small particles of waste phenolic plastic can improve the material properties. The notched impact strength of materials added with waste aldehyde plastics has improved, and the bending properties, dielectric strength, water absorption and thermal distortion temperature have basically remained unchanged. Effect of waste phenolic plastic recycling materials on the properties of phenolic plastics Material composition Bending strength/MPa Tensile Strength/MPa Notched impact strength/(J/M2) Unnotched impact strength/(J/M2) Heat distortion temperature/oC
Phenolic resin 85.5 46.7 752 3154 115
Phenolic resin Resin + 5% large particle size recycled material 74.0 23.1 904 1955 110
Phenolic tree index + 5% medium particle size recycled material 81.2 40.6 1135 2039 107
Phenolic tree index + 5% small particle size recycled material 79.1 37 967 2376 109
Phenolic resin + 10% medium particle size recycled material 80.5 —— 736 2039 107
Phenolic resin + 15% medium particle size recycled material Particle size recycled material 78.8 —— 820 2018 111
Phenolic resin + 20% medium particle size recycled material 77.0 —— 749 1998 109
Definition and classification of degradable plastics and uses
1. Definition
Degradable plastics refer to a category of products whose various properties can meet the requirements of use, remain unchanged during the storage period, and remain in the natural environment after use Plastics that can degrade into environmentally friendly substances under certain conditions, therefore, are also called environmentally degradable plastics.
Polymer degradation refers to the process of fragmentation of polymerized macromolecules caused by chemical and physical factors. Polymers are exposed to oxygen, water, heat, light, radiation, chemicals, pollutants, and mechanical forces. The degradation process of macromolecular chain breakage in animals such as insects and microorganisms under environmental conditions is called environmental degradation. Degradation causes the molecular weight of the polymer to decrease and the physical properties of the polymer material to decrease until the polymer material loses its usability. This phenomenon is also called the aging degradation of the polymer material.
Both natural and synthetic polymers will degrade when exposed to environmental conditions. However, under the same environmental conditions, the degradation susceptibility of various polymers, especially synthetic polymers, is quite different. , therefore, the decomposability of various polymers is also different. For example, polypropylene is easily degraded under light-oxygen environmental conditions, while polystyrene is difficult to degrade under the same environmental conditions. Polyvinyl alcohol is susceptible to degradation in the presence of certain microorganisms. It is easier to degrade under certain environmental conditions, while polyethylene, polypropylene, and polystyrene are difficult to degrade under the same environmental conditions.
The degradation process of environmentally degradable plastics mainly involves biological degradation, photodegradation and chemical degradation. Moreover, these three main degradation processes have synergistic, synergistic and coherent effects on each other. For example, photodegradation and oxidative degradation often proceed simultaneously and promote each other; biodegradation is more likely to occur after the photodegradation process.
The aging degradation of polymers is directly related to the stability of polymers. Aging degradation of polymers shortens the service life of plastics. For this reason, since the advent of plastics, scientists have been committed to research on anti-aging, that is, stabilization, of such materials to produce highly stable polymer materials. Currently, scientists from various countries are also taking advantage of the aging degradation of polymers. Acts race to develop environmentally degradable plastics.
2. Classification
Environmentally degradable plastics are a new type of plastics
Foreign development of environmentally degradable plastics began in the 1970s, when they mainly developed optical The purpose of degradable plastics is to solve the environmental pollution problems caused by plastic waste, especially disposable plastic packaging products. By the 1980s, development and research turned to biodegradable plastics. Moreover, there were also efforts to use renewable resources instead of petroleum. , biodegradable plastics produced from raw materials such as plant starch and cellulose, animal chitin, etc. In addition, biodegradable plastics produced by microbial fermentation have also been developed.
A type of biodegradable medical plastic that has long been used clinically, such as polylactic acid, has also attracted people's attention, hoping that it can be used to solve the environmental pollution problem of plastics. However, whether this type of plastic can There are still different opinions on classifying it as environmentally degradable plastics. The opinion of the Japan Degradable Plastics Research Association believes that it cannot be classified as environmentally degradable plastics. However, considering that degradable plastics are a new type of plastic, they should also include biodegradable plastics, and degradable plastics may be classified according to their uses into environmentally (naturally) degradable plastics and biodegradable (environmentally) degradable plastics. The latter has been used in medicine for surgical sutures, artificial bones, etc.
China’s development and research on degradable plastics is basically in sync with the world. However, the research and development of degradable plastics in China began with agricultural mulch films. China is a large agricultural country, with the consumption of mulch film ranking first in the world. In order to solve the problem of residual mulch film accumulated in farmland causing damage to plant root system development and affecting crop yields, as well as the obstruction of agricultural machinery and mechanized farming operations by residual mulch film, in the 1970s, The development of photodegradable plastic mulch films began. Around 1990, biodegradable plastics filled with starch in general plastics appeared. At the same time, on the basis of photodegradable plastics, mulch films with both photodegradable and biodegradable functions filled with starch were developed. . At present, various types of degradable mulch films are under development and are still in the application demonstration and promotion stage. In recent years, as the living standards of the Chinese people have improved, the environmental pollution problems caused by disposable plastic packaging products have become increasingly serious. For this reason, degradable plastic products for packaging, mainly disposable packaging, such as garbage bags, are being actively developed. Shopping bags, lunch boxes, etc.
3. Uses
There are two main uses for degradable plastics: one is the area where ordinary plastics were originally used. In these areas, used or post-consumer plastic products are difficult to collect and cause harm to the environment, such as agricultural mulch films and disposable plastic packaging. The second is areas where plastics are used to replace other materials. The use of degradable plastics in these areas can bring convenience, such as golf pegs for golf courses and seedling fixing materials for tropical rainforest afforestation. The specific application areas are as follows:
1. Agriculture, forestry and fishery, mulch films, water-retaining materials, seedling pots, seedbeds, rope nets, pesticides and fertilizer slow-release materials.
2. Packaging industry, shopping bags, garbage bags, compost bags, disposable lunch boxes, instant noodle bowls, buffer packaging materials
3. Daily groceries, disposable tableware (knives , forks, chopsticks) toys, disposable gloves, disposable tablecloths.
4. Sporting goods, golf course spikes and tees
5. Hygiene products, women's hygiene products, baby diapers, medical mattresses, disposable razors.
6. Medical materials, bandages, clips, small sticks for cotton swabs, gloves, drug sustained-release materials, as well as surgical sutures and fracture fixation materials.
Selected from China Plastics Industry Network