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A kind of aromatic barium mercapto salt, composition and its application as stabilizer in PVC
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An aromatic and composition technology, applied in the preparation of organic compounds, carboxylates, carboxylates, etc., can solve the problems of poor stability, affect the colorability and precipitation of PVC films, and achieve good resistance. Oxidation, improving initial coloration and later stability, and good compatibility
Active Publication Date: 2018-02-27
ZHEJIANG HIMPTON NEW MATERIAL
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[0004] At present, the barium soap in the barium-zinc composite stabilizer is mainly formed by the reaction of carboxylic acid and barium hydroxide. The carboxylic acid is mainly fatty acid, and the stabilized barium carboxylate is the C-Ba bond. Poor, and most of them are easy to precipitate during processing, which seriously affects the coloring and precipitation of PVC film
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Embodiment 1
[0039] Put 314g of o-toluic acid, 104g of diethylene glycol, and 1.5g of concentrated sulfuric acid into the reactor, stir, raise the temperature to 110°C, and continue the reaction for 3 hours at a vacuum of -0.06MPa, remove the generated water, and then wash with water. Dehydration obtains dimercaptobenzoic acid ester;
[0040] Mix the intermediate product of the above reaction with 150g of isooctanoic acid and 40g of butanediol methyl ether at 60°C for 40 minutes, add 90g of barium hydroxide, heat up to 110°C, react for 2 hours, dehydrate, and filter to obtain the product aromatic mercapto Barium salt 1#, after determination, the barium content is 10.12%.
Embodiment 2
[0042] Put 283g of p-toluic acid, 93g of diethylene glycol, and 3g of p-toluenesulfonic acid into the reactor, stir, raise the temperature to 115°C, and continue the reaction for 2.5 hours at a vacuum degree of -0.08MPa to remove the generated water. Then wash with water and dehydrate to obtain dimercaptobenzoic acid ester;
[0043] Mix the intermediate product of the above reaction with 163g of n-capric acid and 32g of propylene glycol ethyl ether at 65°C for 45 minutes, add 80g of barium hydroxide, heat up to 105°C, react for 2.5 hours, dehydrate, and filter to obtain the product aromatic mercaptobarium salt 2#, after determination, the barium content is 9.43%.
Embodiment 3
[0045] Put 220g of m-toluic acid, 73g of diethylene glycol, and 1g of sodium bisulfate into the reactor, stir, raise the temperature to 113°C, and continue the reaction for 3.5 hours at a vacuum of -0.07MPa, remove the generated water, and then wash with water. Dehydration obtains dimercaptobenzoic acid ester;
[0046] Mix the intermediate product of the above reaction with 208g of lauric acid and 30g of ethylene glycol butyl ether at 63°C for 50 minutes, add 63g of barium hydroxide, heat up to 107°C, react for 3 hours, dehydrate, and filter to obtain the product aromatic mercapto Barium salt 3#, after determination, the barium content is 9.24%.
[0047] Two, the preparation of aromatic mercapto barium salt composition
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Abstract
The invention relates to aromatic mercapto barium salts, a preparing method thereof and applications of the aromatic mercapto barium salts. The general formula structure of the aromatic mercapto barium salts is shown in the description, wherein R is a C8-C12 straight-chain or branch-chain alkane. The preparing method for the aromatic mercapto barium salts includes (1) mixing mercaptobenzoic acid, diethylene glycol and a catalyst by stirring, heating to 70-150 DEG C, reacting with the vacuum degree ranging from -0.06 MPa to -0.09 MPa until no water drops in a water separator, cooling to room temperature, washing with water, and subjecting an oil phase to vacuum distillation to remove water to obtain diethylene glycol mercaptobenzoate, and (2) adding a C8-C12 aliphatic acid, a solvent and a proper amount of barium hydroxide, reacting at 90-110 DEG C for 2-4 h, dehydrating, and filtering to obtain a target product. Novel barium soap is adopted to improve thermal stability of PVC. Contrast experiments prove that the through applying compositions formed by the aromatic mercapto barium salts, the zinc soap and traditional stabilizing agents as PVC stabilizing agents, the initial-stage coloring stability and later-period stability of the PVC can be greatly improved and precipitation is inhibited so that the compositions have a good application prospect.
Description
technical field [0001] The invention relates to an aromatic barium mercapto salt, a composition and its application as a stabilizer in PVC. Background technique [0002] Polyvinyl chloride (PVC) is the second largest plastic species after polyethylene. It has high strength, excellent corrosion resistance and insulation. Its products are widely used in construction, electrical appliances, toys, packaging and other industries. However, PVC has its structural defects. It is unstable when heated and decomposes to release hydrogen chloride gas. The solution is to add heat stabilizers to PVC processing. [0003] Liquid composite metal soap stabilizers are more and more widely used because they are free from dust pollution in the production and application process, clean and environmentally friendly, easy to measure, and low in price. Among them, liquid barium zinc heat stabilizer is widely used in soft PVC because of its high heat stability and good transparency. [0004] At pre...
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