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Recycled PVC blending modification technology--Yiwu pc lens sales manufacturer

by:Eugenia     2022-01-09
Recycled plastics have become an effective social resource. The components of recycled plastics are often blended with two or more different materials. These materials can be used to produce various plastic products. Modification of plastics is another simple and effective method to obtain new performance resins besides polymerization methods. Modified synthetic materials are not only simple in process, low in cost, but also excellent in performance, which expands the application fields of synthetic resins. The use of blending modification process technology to achieve high performance, multi-function and refinement of recycled plastics is a relatively scientific and practical new process technology. Polyvinyl chloride has many excellent properties and is widely used, but it also has obvious shortcomings, such as low softening point, poor heat resistance, poor cold resistance, easy decomposition, and poor thermal stability. In order to improve its shortcomings, some modified varieties of polyvinyl chloride have appeared.>>>>Blend modification of recycled PVC? PVC/CPE blended modified polyvinyl chloride and polyethylene are general-purpose plastics with a large amount, occupying a large proportion of waste plastics, and often when recycling waste plastics Difficult to sort. CPE is the product of chlorinated polyethylene. CPE with a chlorine content of 25%-40% has the properties of an elastomer. CPE can act as a compatibilizer between polyvinyl chloride and polyethylene, and can improve the performance of the blend, which is of great significance for the recycling and reuse of polyvinyl chloride and polyethylene recycled plastics. In addition, CPE can be added to PVC hard products, mainly for the purpose of toughening modification. CPE with a chlorine content of 36% is usually used as a toughening modifier for PVC. ? PVC/MBS blended modified MBS is formed by grafting methyl methacrylate (MMA) and styrene (ST) onto polybutadiene (PB) or styrene butadiene rubber (SBR) macromolecular chains. Branch blend. MBS resin has good compatibility with polyvinyl chloride, which can significantly increase the impact strength of polyvinyl chloride and improve the processing performance of polyvinyl chloride. PVC/MBS blends also have better transparency. Therefore, MBS It is widely used in the toughening modification of rigid PVC, especially in transparent products. ? PVC/EVA blend modified EVA is a random copolymer of ethylene and vinyl acetate. Polyvinyl chloride and EVA are blended and modified. EVA can be used for toughening modification of rigid polyvinyl chloride, and it can also be used for soft polyvinyl chloride. Rigid PVC/EVA blends can be used to produce sheets and profiles, and can also be used to produce low-foaming products. The use of EVA in soft polyvinyl chloride can significantly improve the cold resistance of polyvinyl chloride. The embrittlement temperature of this PVC/EVA blend can reach -70°C. In addition, the soft PVC/EVA blend also has a good feel. Soft PVC/EVA blends can be used to produce cold-resistant films, sheets, artificial leather, etc., and can also be used to produce foamed products. ? PVC/ABS blended modified ABS is an acrylonitrile-butadiene-styrene copolymer, which has the characteristics of high impact performance, easy molding and processing, good hand feeling and easy electroplating. Blending polyvinyl chloride with ABS can combine the advantages of the two to become a new material with a wide range of uses in electrical enclosures, electrical components, automobile dashboards, textile equipment, luggage and so on. ABS can be used as a toughening modifier for rigid PVC, and its processing fluidity is also significantly improved. Due to the moderate compatibility between PVC and ABS, compatibilizers such as CPE, SAN, etc. should be added during blending. After adding the compatibilizer CPE to the ABS/PVC blend system, the impact strength of the blend system can be significantly improved. In addition, because ABS contains unsaturated double bonds, its thermal stability and antioxidant properties are low, so in addition to adding heat stabilizers to the formulation, antioxidants should also be added. The blending of ABS and PVC can also significantly improve the flame-retardant properties of ABS. This feature makes ABS/PVC blends suitable for the manufacture of electrical enclosures and components, and can avoid the shortcomings of performance degradation and additives precipitation caused by the addition of small molecule flame retardants. In the PVC/ABS blend system, an appropriate amount of plasticizer can also be added to become a semi-rigid product, which can be used to manufacture automobile dashboards. ? PVC/TPU blending modified polyvinyl chloride and thermoplastic polyurethane are blended and modified to become a new type of thermoplastic elastomer, also known as polyurethane rubber. Polyurethane has excellent physical and chemical properties and excellent biocompatibility. Blending TPU with polyvinyl chloride, replacing liquid plasticizers such as DOP with TPU to make soft polyvinyl chloride medical products, which can avoid the migration of liquid plasticizers. In the PVC/TPU blend system, in order to improve the mechanical properties, reinforcing agents can be added. Among various reinforcing agents, white carbon black (silica) has a better reinforcing effect. The heat stabilizer of polyvinyl chloride can choose calcium stearate and so on. TPU can also be used in PVC hard products as a toughening agent for PVC to prepare PVC/TPU blended toughening materials. ? Blending of different varieties of polyvinyl chloride The blending modification of polyvinyl chloride includes not only the blending of polyvinyl chloride with other polymers, but also the blending of different varieties of polyvinyl chloride. High degree of polymerization polyvinyl chloride is blended with ordinary polyvinyl chloride. High degree of polymerization polyvinyl chloride resin (HPVC) refers to polyvinyl chloride resin with a degree of polymerization greater than 2000. HPVC can be used to make polyvinyl chloride thermoplastic elastomers. However, due to the high degree of polymerization, it is difficult to process and shape HPVC. Blending HPVC with ordinary polyvinyl chloride can improve the processing fluidity of HPVC. For ordinary polyvinyl chloride, HPVC can be regarded as a modifier, which can improve the performance of ordinary polyvinyl chloride. HPVC has a higher plasticizer capacity than ordinary polyvinyl chloride. In the HPVC/PVC blend system, more plasticizers can be added to improve the cold resistance and elasticity of the product. Here HPVC plays a role similar to nitrile rubber. For example, adding more than 20 parts of HPVC to the soft polyvinyl chloride film, the product is full of elasticity, and has good low-temperature flexibility. Yiwu pc lens sales factory
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