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Lanthanum sorbate composite heat stabilizer for pvc

A composite heat stabilizer, lanthanum sorbate technology, applied in the field of heat stabilizers for PVC, can solve the problems of strong odor, easy vulcanization pollution, high price, etc., and achieve excellent static thermal stability and dynamic thermal stability.

Active Publication Date: 2021-05-25
TANGSHAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organotin has excellent thermal stability and transparency, but it is expensive, has a strong odor, and is easy to sulfide and pollute, so people have different opinions on its application

Method used

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  • Lanthanum sorbate composite heat stabilizer for pvc

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of lanthanum sorbate: add water into a three-necked flask as a solvent; add 0.03mol sorbic acid into the solvent; heat up to 70°C, keep warm for a period of time until the sorbic acid is fully dissolved, take 0.03mol sodium hydroxide and mix it with deionized water into a 0.5 mol / L solution, transferred to a constant pressure dropping funnel, dropped into a three-necked flask, and controlled at a rate of 1 drop / s, until the pH of the solution = 7, and kept stirring during the dropping process. Prepare 0.01mol lanthanum nitrate with deionized water to make a 0.1mol / L solution, slowly drop it into a flask, control the reaction temperature at 80°C, keep the reaction for 40min, and then filter with suction to obtain a precipitate. Wash the precipitate with absolute ethanol at 60-70°C for 2-3 times, and dry it in a blast drying oven at 70°C to obtain lanthanum sorbate.

[0021] The preparation of zinc stearate: adopt above-mentioned same method, make zinc stearat...

Embodiment 2

[0024] Preparation of lanthanum sorbate: add water into a three-necked flask as a solvent; add 0.03mol sorbic acid into the solvent; heat up to 70°C, keep warm for a period of time until the sorbic acid is fully dissolved, take 0.03mol sodium hydroxide and mix it with deionized water into a 0.5 mol / L solution, transferred to a constant pressure dropping funnel, dropped into a three-necked flask, and controlled at a rate of 1 drop / s, until the pH of the solution = 7, and kept stirring during the dropping process. Prepare 0.01mol lanthanum nitrate with deionized water to make a 0.1mol / L solution, slowly drop it into a flask, control the reaction temperature at 80°C, keep the reaction for 40min, and then filter with suction to obtain a precipitate. Wash the precipitate with absolute ethanol at 60-70°C for 2-3 times, and dry it in a blast drying oven at 70°C to obtain lanthanum sorbate.

[0025] Preparation of calcium stearate: adopt above-mentioned same method, make calcium stear...

Embodiment 3

[0028] Preparation of lanthanum sorbate: Add water into a three-necked flask as a solvent; add 0.03mol sorbic acid into the solvent; heat up to 80°C, keep warm for a period of time until the sorbic acid is fully dissolved, and take 0.03mol sodium hydroxide and mix it with deionized water into a 1 mol / L solution, transferred to a constant pressure dropping funnel, and dropped into a three-necked flask at a controlled rate of 1 drop / s until the pH of the solution was 7, with constant stirring during the dropping process. Prepare 0.01mol lanthanum nitrate with deionized water to make 0.3mol / L solution, slowly drop it into the flask, control the reaction temperature at 80°C, keep the reaction for 40min, and then suction filter to obtain the precipitate. Wash the precipitate with absolute ethanol at 60-70°C for 2-3 times, and dry it in a blast drying oven at 70°C to obtain lanthanum sorbate.

[0029] The preparation of zinc stearate: adopt above-mentioned same method, make zinc ste...

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Abstract

The invention provides a lanthanum sorbate composite heat stabilizer for PVC, which is compounded by lanthanum sorbate and zinc stearate or lanthanum sorbate and calcium stearate, wherein the compound of lanthanum sorbate and zinc stearate The molar ratio is 3:1 to 15:1, and the molar ratio of lanthanum sorbate to calcium stearate is 1 / 3:1 to 3:1. In the present invention, the conjugated double bond that can be added in the molecular chain of sorbic acid and the rare earth lanthanum ion play a synergistic role, and at the same time, the lanthanum sorbate is compounded with zinc stearate or calcium stearate according to the principle of similar compatibility. The lanthanum sorbate composite thermal stabilizer for PVC of the present invention has excellent static thermal stability and can simultaneously take into account dynamic thermal stability.

Description

technical field [0001] The invention relates to a heat stabilizer for PVC, in particular to a lanthanum sorbate composite heat stabilizer for PVC. Background technique [0002] Polyvinyl chloride (PVC) is a thermoplastic linear polymer obtained by free radical polymerization of vinyl chloride as a monomer. Its products are widely used in industry, agriculture, construction, automobiles, aerospace, electronics, various fields of life. PVC is a heat-sensitive material. Due to the unstable structure generated during the polymerization process, it is prone to dechlorination and degradation when heated, and the double bonds and conjugated double bonds on the molecular chain continue to increase, resulting in its color changing from white to yellow. Brown, brown until it completely turns black, and its mechanical properties gradually lose until it loses its use value. Therefore, heat stabilizers need to be added during molding processing to prevent it from being degraded and cros...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/06C08K5/098C08K3/28
CPCC08K3/28C08K5/098C08K2201/014C08L2201/08C08L27/06
Inventor 于静李敏贤
Owner TANGSHAN NORMAL UNIV
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