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Dihydropyridine PVC composite heat stabilizer and preparation method thereof

A composite heat stabilizer and dihydropyridine technology, which is applied in the field of dihydropyridine PVC composite heat stabilizer and its preparation, can solve problems such as instability in the later stage of processing, and achieve improved thermal stability time, excellent initial whiteness, and plasticity. The effect of enhanced ability

Pending Publication Date: 2021-12-10
慧科高新科技股份有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The environment-friendly calcium-zinc stabilizer has the advantages of environmental protection, non-toxicity, low price, and easy-to-obtain raw materials. It overcomes the shortcomings of other types of heat stabilizers and has become the mainstream heat stabilizer currently used. However, it has the problem of instability in the later stage of processing.

Method used

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  • Dihydropyridine PVC composite heat stabilizer and preparation method thereof
  • Dihydropyridine PVC composite heat stabilizer and preparation method thereof
  • Dihydropyridine PVC composite heat stabilizer and preparation method thereof

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Embodiment 1-3

[0029] Preparation of Molecular Sieve Modified by Sodium Perchlorate

[0030] The 4A type molecular sieve is subjected to water removal treatment in an industrial microwave oven, mixed with perchlorate after being taken out, cooled to room temperature and fully ground to obtain a modified molecular sieve. The drying temperature is 375±25°C, the drying time is 3 hours, and the mixing time is 20 minutes.

[0031] The mass ratio of perchlorate to dried 4A molecular sieve is 2:3.

[0032] Preparation of dihydropyridine PVC composite heat stabilizer:

[0033] Dihydropyridine can be prepared by co-heating (1 hour) ethyl acetoacetate and urotropine in ethanol solution of ammonium acetate; the obtained liquid is cooled to precipitate crystals, filtered and washed with ethanol, and dried in air to obtain a light yellow powder like dihydropyridine.

[0034] In a high-speed mixer, add dihydropyridine and heat up to 80-90°C, continue to add sodium perchlorate modified molecular sieves ...

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Abstract

The invention belongs to the technical field of chemical synthesis, and particularly relates to a dihydropyridine PVC (polyvinyl chloride) composite heat stabilizer and a preparation method thereof, and the composite heat stabilizer is prepared from the following raw materials in parts by weight: 20-30 parts of dihydropyridine; 5-10 parts of an antioxidant; 5-10 parts of a plasticizer; 20-45 parts of a modified molecular sieve; 10-20 parts of zinc stearate; and 5-10 parts of calcium stearate. The stabilizer is formed by compounding dihydropyridine and a sodium perchlorate modified molecular sieve, beta-diketone, bisphenol A, pentaerythritol and other components in a traditional calcium-zinc stabilizer formula are replaced, and the dosage of hard calcium, hard zinc and calcium stearate is reduced. The stabilizer has excellent synergistic effect and lubricating effect, and can prolong the thermal stability time of PVC products, prevent precipitation and blooming phenomena, improve the later weather resistance and reduce the production cost.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a dihydropyridine PVC composite heat stabilizer and a preparation method thereof. Background technique [0002] PVC is the abbreviation of polyvinyl chloride resin. It is a thermoplastic linear polymer produced by free radical polymerization of vinyl chloride monomer. The industrial product is white or light yellow powder, with a relative density of 1.36 and a chlorine content of 56-58%. It has the advantages of alkali resistance, wear resistance, good electrical insulation, flame retardant and self-extinguishing. However, PVC has poor thermal stability, and when heated to 140 degrees, hydrogen chloride will be released to degrade and lose processability. Usually, the processing temperature is above 160-180 degrees. Therefore, heat stabilizers must be added during PVC molding. PVC heat stabilizers are essential in PVC processing. [0003] To solve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/3432C08K9/02C08K7/26C08K5/098C08L27/06
CPCC08K5/3432C08K9/02C08K7/26C08K5/098C08L2201/08C08L27/06
Inventor 唐守余曹伟李廷希张海昌李德刚杨朝平
Owner 慧科高新科技股份有限公司
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