In addition to calcium powder, what else can be added to PVC injection granulation to make the product hard?
You can also add silica powder, that is, silica powder. Will the granulation temperature increase if more calcium powder is added to PVC granulation?
No, the calcium powder is dispersed in PVC. The key is that the resin melts. If it reaches its dispersion limit, no matter how high the temperature is, it will not matter. Use, the temperature rise is just plasticizing. PVC injection molding adds nano-calcium and the product produced by injection molding has powder particles
Mix evenly, reach a certain temperature, cool, it is best to granulate and then injection molding
If There is also the problem that the formula may not be reasonable. Why does PVC secondary granulation calcium powder not plasticize?
The introduction of polyvinyl chloride uses polystyrene standards and THF (tetrahydrofuran) as the mobile phase (note that your column must be able to be used for THF ), a differential refractive index detector, and a universal calibration method to determine the molecular weight and distribution of PVC. Most literature gives the K and α values ??of each polymer at 25°C. The K and α values ??of polystyrene and polyvinyl chloride at 28°C have not yet been found in reliable literature. If it is not necessary to measure the molecular weight of PVC at 28°C, it can be measured at 25°C. At this time, the K and a of PS and PVC are as follows: PS: K=0.016, a=0.706 PCV: K=0.0163, a=0.766 Definition , Features Polyvinyl chloride tile (UPVC lightweight roof tile) is a new type of roof waterproof material. PVC tiles are made of rigid polyvinyl chloride (UPVC) as the main material and are mixed with heat stabilizers, lubricants, fillers, light shielding agents, ultraviolet absorbers, foaming agents, etc., after being mixed, plasticized and processed through three processes. What is the difference between polyethylene, polyvinyl chloride, polystyrene, and polypropylene? Polyethylene PE is milky white, translucent, and waxy when it is not colored; it is made by hand. The product feels smooth when touched, flexible and pliable; it can be slightly stretched. Generally, low-density polyethylene is softer and has better transparency; high-density polyethylene is harder. Common products: handbags, water pipes, oil drums, beverage bottles (calcium milk bottles), daily necessities, etc. Polypropylene PP is white, translucent, and waxy when uncolored; lighter than polyethylene. The transparency is also better than polyethylene and harder than polyethylene. Common products: basins, barrels, furniture, films, woven bags, bottle caps, car bumpers, etc. Polystyrene PS is transparent when untinted. When the product is dropped or knocked, it will have a metallic-like crisp sound. It has a good luster and transparency, similar to glass. It is brittle and easy to break. You can scratch the surface of the product with your fingernails. Modified polystyrene is opaque. Common products: stationery, cups, food containers, home appliance casings, electrical accessories, etc. Polyvinyl chloride PVC is slightly yellow, translucent in color and shiny. The transparency is better than polyethylene and polystyrene, but worse than polystyrene. Depending on the amount of additives, it is divided into soft and hard polyvinyl chloride. Soft products are flexible and tough and feel sticky, while hard products have a higher hardness than low-density polyethylene. , and lower than polypropylene, whitening will occur at the inflection point. Common products: sheets, pipes, shoe soles, toys, doors and windows, wire sheaths, stationery, etc. Polyethylene terephthalate PET has good transparency, better strength and toughness than polystyrene and polyvinyl chloride, and is not easily broken. Common products: often bottle products such as cola, mineral water bottles and other polyethylene wastes. Polyethylene is the thermoplastic with the largest output among plastics and the most widely used. It is polymerized from ethylene and is a partially crystalline material. It can be used as general thermoplastics. The molding method is processed. Polyethylene can be divided into three categories: high-density polyethylene, low-density polyethylene and linear low-density polyethylene. The density of high-density polyethylene is generally higher than 0.94g/cm, while the density of low-density polyethylene and linear low-density polyethylene is between 0.91 and 0.94g/cm. There are two main sources of waste polyethylene film: 1. Leftovers and defective products produced in film production. These waste materials are clean and have clear varieties. They can be crushed and compressed and sent directly to the extruder for granulation. The recycling process is relatively simple. 2. Waste films from the chemical industry, electrical industry, food and consumer goods industry, etc.
These waste films have been contaminated, some have been colored and printed with trademarks, and some also contain impurities such as sand, sawdust or shredded paper. Because polyethylene is cheap, easy to obtain, and easy to mold, its products have a wide range of applications, but the most used ones are packaging products, estimated to be more than 60. High-density polyethylene is mainly used in packaging films, bottles, and hollow containers; low-density polyethylene is mainly used in packaging films and agricultural films; linear low-density polyethylene is mainly used in films, film plastics, and pipes. And on wires and cables. PVC waste PVC used to be the most widely used plastic in history. Now it is replaced by polyethylene and PET in some fields, but it is still used in large quantities. Its consumption is second only to polyethylene and polypropylene. Polyvinyl chloride products are available in various forms and can be divided into three categories: hard polyvinyl chloride, soft polyvinyl chloride, and polyvinyl chloride paste. Rigid polyvinyl chloride is mainly used in extruded products such as pipes, door and window profiles, and sheets, as well as injection molded parts such as pipe joints, electrical parts, and extrusion-blown bottle products. They account for more than 65% of PVC consumption. Soft PVC is mainly used in calendered sheets, automotive interiors, handbags, films, labels, wires and cables, medical products, etc. PVC paste accounts for about 10% of PVC products, and its main products include slush molding products. Polymethyl methacrylate waste Polymethyl methacrylate (PMMA) is commonly known as organic glass. PMMA has unique properties that other plastics do not have: excellent transparency (close to glass); good toughness, chemical resistance, and weather resistance. Therefore, it has been widely used in automobiles, medical equipment, indoor swimming pools, etc. With the development of automobiles and other related industries, the usage of PMMA is also increasing. There are three main categories of PMMA products: sheets made by casting or extrusion methods; specific products that already contain additives such as modifiers and pigments; paints and coatings. Polystyrene waste Polystyrene is a homopolymer of styrene, a general-purpose thermoplastic plastic whose output is second only to polyethylene, polypropylene, and polyvinyl chloride. Polystyrene has a wide range of applications. It can be roughly divided into the following four aspects: General-purpose polystyrene: It is used in a large number of daily products and transparent products such as home appliances, computers, and medical care. High-impact polystyrene: Its impact strength and elongation at break are greatly improved. The products are widely used in electrical accessories, home appliance casings, food containers, etc. Extruded foamed polystyrene sheets and thermoformed products: Thick sheets are mainly used as thermal insulation, sound insulation and shock-proof materials. Thermoformed products are widely used in food packaging and fast food containers. Expandable polystyrene foam products: Products are used in shock-proof packaging for electrical appliances and thermal insulation materials in construction, refrigeration and other industries. The first two types of polystyrene products have a long service life and can be recycled by conventional recycling methods, so they put less pressure on the environment. The latter two types of polystyrene products are mostly disposable packaging, which are large in size and consume a lot. If they are directly discarded without processing, they will cause great pressure on the environment. A large part of what people often call "white pollution" is styrofoam. Polyethylene terephthalate waste Polyethylene terephthalate (PET) is the condensation polymer of terephthalic acid or dimethyl terephthalate and ethylene glycol ester. Linear thermoplastic. PET is usually a crystalline plastic, but in bottles and film products, in order to make it highly transparent, special process conditions can be used to make it an amorphous plastic. PET has a wide range of uses due to its excellent performance and low cost. According to its product form, it can be divided into four categories: polyester fiber, film, engineering injection molded parts, and bottles. PET bottles have replaced some traditional packaging materials due to their advantages such as light weight, non-breakability and low energy consumption. They are widely used in food, beverages, cosmetics and other fields. Especially for beverage bottles, PET has an absolute advantage. Beverage bottles are single-use, so the amount of waste is huge. The recycling technology of PET bottles has reached a very high level abroad, and the recycling rate in the United States, Germany and other countries has now reached more than 80%. Not only that, in order to facilitate recycling, these countries have also formulated some local regulations, which have mandatory regulations on the disposal, collection, use, design and manufacturing of PET bottles.
A simple classification of the sources of waste plastics. Plastics, especially thermoplastics, will produce waste materials or discarded products in every link such as synthesis, molding processing, circulation and consumption, collectively referred to as "plastic waste", the vast majority of which are generated during consumption and use. , and especially packaging materials, agricultural films and disposable drugs have the largest amount of waste. Generation of waste plastics: 1. Waste generated during resin production; 2. Waste generated during molding processing; 3. Waste generated during compounding and regeneration processing; 4. Waste generated during secondary processing; 5. Industrial consumption Post-plastic waste; This type of waste comes from a wide range of sources and has complex usage conditions, and must be processed before it can be recycled and reused. This type of waste includes: 1) Bags, barrels, etc. used in the chemical industry; 2) Containers, waste rayon, etc. in the textile industry; 3) Packaging materials, foam anti-shock pads, etc. in the home appliance industry; 4) Construction Building materials, pipes, etc. in the industry; 5) Shrink film, stretch film, etc. in the filling industry; 6) Turnover boxes, egg trays, etc. in the food processing industry; 7) Mulch film, greenhouse film, fertilizer bags, etc. in agriculture ; 8) Fishing nets, floating balls, etc. in fishing; 9) Bumpers, fuel tanks, battery boxes, etc. removed from scrapped vehicles. 6. Waste plastics after daily consumption
It may be that too much calcium powder is added. You can appropriately reduce the amount of calcium powder and add RQT-P-1 to increase the plasticity of the plastic. The degree of chemicalization can make the plastic molecules better combined and increase the brightness. What is new in pp plastic granulation? Injection molded products shrink less and are quick to shape
Glass fiber, minerals, elastomers and polyethylene can be added to improve it. The effect is glass fiber gt; minerals gt; elasticity. Body gt; polyethylene. Can adding calcium powder to PVC plastic powder increase the volume?
Plastic can be regarded as an incompressible solid under normal conditions. Whether fillers or plasticizers are added, the volume will increase. What product should I use to increase the tensile strength of PVC granulation?
Tensile strength is closely related to the degree of polymerization of PVC, calcium powder content, plasticizer dosage, toughening agent dosage, etc. The tensile strength can be improved by replacing high polymerization resin, reducing calcium powder, reducing plasticizers and toughening agents. Rigid particle toughening replaces ordinary toughening. Cross-linking and mixing with ABS or CPVC are also effective. Can injection molding PVC products add new masterbatch?
Can it be made into PVC particles? You can pay attention to the PVC filled masterbatch PVC used in Guangdong Wei Linna injection molding. Is there any such product with added calcium powder? It is native. The PVC is mixed with 5 calcium powder.
If calcium powder is not filled, it is organic tin, which is very expensive