Preparation process of modification additive for improving thermal stability of PVC materials

A PVC material, thermal stability technology, applied in the field of plastic materials, can solve the problems of "zinc burning", general long-term stability, etc., to improve heat-resistant temperature, reduce discoloration imagination, and inhibit the generation of conjugated polyene structure Effect

Inactive Publication Date: 2019-09-03
许艳辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the traditional calcium-zinc stabilizer is cheap, its long-term stability is average and it is prone to "zinc burning" phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation process for modifying additives for improving thermal stability of PVC materials, comprising the following steps:

[0022] (1) Stearic acid / expanded graphite compound: Add stearic acid to the reaction kettle, then heat to 80°C, then stir at 500r / min for 20min, and then slowly add expanded graphite with 2.2% stearic acid mass , continue to stir for 1 hour, and then naturally cool to room temperature to obtain the stearic acid / expanded graphite compound;

[0023] (2) Modifier: Add maleic anhydride and 1,4-dioxane into the reaction kettle, stir at 550r / min, then heat to 75°C, keep warm for 40min, then add p-aminobenzene The mixed solution of formic acid and 1,4-dioxane is slowly added dropwise into the reaction kettle, wherein the mass of the mixed solution of p-aminobenzoic acid and 1,4-dioxane is 20% of the mass of maleic anhydride, respectively at 70°C and Keep stirring at 85°C for 2 hours, then stop the reaction, and the obtained reaction product is rota...

Embodiment 2

[0033] A preparation process for modifying additives for improving thermal stability of PVC materials, comprising the following steps:

[0034] (1) Stearic acid / expanded graphite compound: Add stearic acid to the reaction kettle, then heat to 82°C, stir at 500r / min for 24min, and then slowly add expanded graphite with 2.5% stearic acid mass , continue stirring for 1.5 hours, then naturally cool to room temperature to obtain stearic acid / expanded graphite composite;

[0035] (2) Modifier: Add maleic anhydride and 1,4-dioxane into the reaction kettle, stir at 550r / min, then heat to 78°C, keep warm for 40min, then add p-aminobenzene The mixed solution of formic acid and 1,4-dioxane was slowly added dropwise into the reaction kettle, wherein the mass of the mixed solution of p-aminobenzoic acid and 1,4-dioxane was 20% of the mass of maleic anhydride, respectively at 72°C and Keep stirring at 88°C for 2 hours, then stop the reaction, and the obtained reaction product is rotary eva...

Embodiment 3

[0045] A preparation process for modifying additives for improving thermal stability of PVC materials, comprising the following steps:

[0046] (1) Stearic acid / expanded graphite compound: Add stearic acid to the reaction kettle, then heat to 81°C, stir at 500r / min for 22min, and then slowly add expanded graphite with 2.3% stearic acid mass , continue to stir for 1.2 hours, then naturally cool to room temperature to obtain stearic acid / expanded graphite composite;

[0047] (2) Modifier: Add maleic anhydride and 1,4-dioxane into the reaction kettle, stir at 550r / min, then heat to 76°C, keep warm for 40min, then add p-aminobenzene The mixed solution of formic acid and 1,4-dioxane was slowly added dropwise into the reaction kettle, wherein the mass of the mixed solution of p-aminobenzoic acid and 1,4-dioxane was 20% of the mass of maleic anhydride, respectively, at 71°C and Each was kept at 86°C and stirred for 2 hours, and then the reaction was stopped, and the obtained reactio...

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Abstract

Relating to the technical field of plastic materials, the invention discloses a preparation process of a modification additive for improving the thermal stability of PVC (polyvinyl chloride) materials. The process includes the steps of: (1) preparation of a stearic acid/expanded graphite compound; (2) preparation of a modifier; and (3) synthesis of the modification additive. The modification additive for improving the thermal stability of PVC materials prepared by the process provided by the invention can significantly improve the thermal stability of PVC materials.

Description

technical field [0001] The invention belongs to the technical field of plastic materials, and in particular relates to a preparation process of a modified auxiliary agent for improving the thermal stability of PVC materials. Background technique [0002] Polyvinyl chloride, English abbreviation PVC (Polyvinyl chloride), is a vinyl chloride monomer (vinyl chloridemonomer, referred to as VCM) in peroxides, azo compounds and other initiators; or under the action of light and heat, it can be polymerized according to the mechanism of free radical polymerization. made polymer. Vinyl chloride homopolymers and vinyl chloride copolymers are collectively referred to as vinyl chloride resins. [0003] PVC is a white powder with an amorphous structure, a small degree of branching, a relative density of about 1.4, a glass transition temperature of 77-90°C, and begins to decompose at about 170°C. It has poor stability to light and heat. When exposed to sunlight, it will decompose to pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K7/24C08K5/09C08K5/20
CPCC08K5/09C08K5/20C08K7/24C08L2201/08C08L27/06
Inventor 许艳辉
Owner 许艳辉
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