PVC composition with dimensional stability
A technology of dimensional stability and composition, applied in the field of PVC composition, can solve the problems of high requirements for production equipment, unusable products, high product density, etc., and achieve scientific and reasonable formula design, increase dimensional stability, and excellent thermal stability. Effect
Active Publication Date: 2020-01-24
CHINA PETROLEUM & CHEM CORP
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Problems solved by technology
[0004] The addition of a large amount of inorganic fillers does increase the dimensional stability of PVC products, but the mechanical properties of the material decrease significantly, and it also leads to excessive density of the products.
The method of using chemical cross-linking to improve the dimensional stability of materials has the problems of complex process and high requirements for production equipment, and at the same time cross-linking makes it difficult to reuse recycled materials
High heat-resistant polymers mainly include N-substituted maleimide copolymers, α-methylstyrene copolymers, styrene-maleic anhydride copolymers, and heat-resistant engineering plastics. The price is high, and the processing temperature range of many copolymers is quite different from that of PVC, so it cannot be used
Method used
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Embodiment
[0029] Embodiment preparation method:
[0030] (1) Mixing of raw materials: Weigh the materials according to the ratio of raw materials, then add them to the high-speed mixer and mix until the mixing temperature is 120°C, put the materials into the low-speed mixer, and discharge the materials when the temperature of the materials cools down to about 40°C.
[0031] (2) Special material granulation process: the mixed material is granulated by twin-screw, and the process parameters are set as follows:
[0032] Extruder temperature (°C): Zone 1, Zone 2, Zone 3, Zone 4, Zone 5
[0033] 110 120 130 140 150 150
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Abstract
The invention relates to a PVC composition with dimensional stability, and belongs to the technical field of polyvinyl chloride resin modification. The PVC composition with dimensional stability includes the following raw materials in parts by mass: 100 parts of PVC resin, 2-3 parts of a stabilizer, 5-6 parts of an impact-resistant modifier, 1.5-2.0 parts of a lubricant, 0.4-0.6 part of an antioxidant, 4-6 parts of a hyperbranched polyester processing aid, and 20-30 parts of modified hydrotalcite. The formula provided by the invention has scientific and reasonable design and low costs, and theobtained PVC resin has the advantages of a stable size, excellent fluidity and excellent thermal stability, thereby facilitating industrial production.
Description
technical field [0001] The invention relates to a PVC composition with dimensional stability and belongs to the technical field of polyvinyl chloride resin modification. Background technique [0002] PVC has excellent mechanical properties, and also has excellent properties such as heat insulation, flame retardant, wear resistance, and chemical corrosion resistance. Its low price and wide source of raw materials make it a general-purpose plastic with superior cost performance. However, the heat resistance of PVC is poor, the glass transition temperature is about 80°C, and the long-term continuous use temperature does not exceed 65°C. Excessively high temperature will cause great deformation of it, which greatly limits its application range. [0003] At present, the methods to improve the heat resistance and dimensional stability of PVC products mainly include adding a large amount of inorganic fillers, cross-linking, and adding high-rigidity monomer copolymers. [0004] Th...
Claims
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IPC IPC(8): C08L27/06C08L67/00C08K9/04C08K9/06C08K3/26
CPCC08L27/06C08L2201/08C08L67/00C08K9/04C08K9/06C08K3/26
Inventor 贾小波裴小静肖恩琳张新华张学明王晶王秀丽
Owner CHINA PETROLEUM & CHEM CORP