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Polyvinyl chloride processing aid and preparation method thereof

A technology of styrene and ethanol, which is applied in the field of polyvinyl chloride processing aids and its preparation, can solve the problems of limited application, poor smell, and high cost of organotin stabilizers, so as to reduce production costs, improve thermal stability, and reduce dosage Effect

Inactive Publication Date: 2012-03-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high cost and bad smell of organic tin stabilizers limit its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Under vigorous stirring, disperse 100 grams of ACR 401 in 400 milliliters of isopropanol / water (volume ratio of isopropanol and water is 20:1) solution of NaOH with a mass concentration of 7% to prepare a suspension. The concentration is 0.25g / ml. Hydrolyze at condensing reflux temperature for 10 hours, control the carboxyl content after hydrolysis to be 2.25×10 -3 mol / g. The hydrolyzate is filtered, dispersed in 300 milliliters of water / ethanol (water and ethanol volume ratio is 1: 25) mixed solvent under vigorous stirring to prepare a suspension, neutralize the excess NaOH in the suspension with hydrochloric acid, adjust the pH value to 5.4. Adding 100 milliliters concentration is the ethanol solution of 100 g / liter lanthanum trichloride, and reacts at reflux temperature for 8 hours. The product was washed, dehydrated, and dried to obtain ACR-Re, in which the mass percentage of rare earth lanthanum was about 4.34%, and the neutralization degree of carboxyl groups w...

Embodiment 2

[0027] Under vigorous stirring, disperse 100 grams of ACR 401 in 500 milliliters of NaOH with a mass concentration of 5.3% in isopropanol / water (the volume ratio of isopropanol and water is 20:1) solution to prepare a suspension, the suspension The concentration is 0.2 g / ml. Hydrolyze at condensing reflux temperature for 6 hours, control the carboxyl content after hydrolysis to be 1.5×10 -3mol / g, the hydrolyzate is filtered, and dispersed in 300 ml of water / ethanol (water and ethanol volume ratio is 1:25) mixed solvent under vigorous stirring to prepare a suspension, neutralize excess NaOH with hydrochloric acid, and adjust the pH value to 4.5, adding 100 milliliters of ethanol solution with a concentration of 40 g / liter lanthanum cerium trichloride, reacting at room temperature for 24 hours, washing, dehydrating and drying the product to obtain ACR-Re, wherein the mass percentage of rare earth lanthanum is 2.2%, the carboxyl group neutralization degree is about 33.6%; the mo...

Embodiment 3

[0029] Under vigorous stirring, disperse 100 grams of ACR 401 in 400 milliliters of NaOH with a mass concentration of 8.3% in isopropanol / water (the volume ratio of isopropanol and water is 20:1) solution to prepare a suspension, the suspension The concentration is 0.25g / ml. Hydrolyze at reflux temperature for 12 hours, control the carboxyl content after hydrolysis to be 4×10-3 mol / g, filter the hydrolyzate, and disperse in 300 ml of water / ethanol under vigorous stirring (the volume ratio of water and ethanol is 1:25) Prepare a suspension in a mixed solvent, neutralize excess NaOH with hydrochloric acid, adjust the pH to 7.0, add 100 ml of ethanol solution with a concentration of 160 g / L lanthanum cerium trichloride, react at reflux temperature for 12 hours, wash and dehydrate the product , dry, and make ACR-Re, wherein, the mass percent content of rare earth lanthanum is 7.3%, and the neutralization degree of carboxyl group is about 46.3%; The molar content of each monomer in...

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PUM

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Abstract

The invention discloses a polyvinyl chloride processing aid (PVC) and a preparation method thereof. Rare earth complex of methyl methacrylate-ethyl acrylate-butyl acrylate-styrene-methyl methacrylate random copolymer can be used as the polyvinyl chloride processing aid, wherein the carboxyl neutralization degree in the complex is 30 to 50 percent; the content of rare earth in percentage by mass is 2.0 to 7.5 percent; and the mol content of each monomer in the random copolymer is that: 50 to 80 percent of methyl methacrylate, 10 to 40 percent of methyl acrylic acid, 5 percent of ethyl acrylateand butyl acrylate, and 5 percent of styrene. The rare earth complex used for the PVC processing aid can obviously increase thermal stability of PVC and improve the tensile property of PVC material, and has PVC plasticization-promoting capacity superior to domestic ACR 401. The aid can be compounded with soap stabilizer and prepared into composite stabilizer free from toxicity, harm and environment pollution so as to reduce the consumption of the soap stabilizer.

Description

technical field [0001] The invention relates to a polyvinyl chloride (PVC) processing aid and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) has strong intermolecular interactions, and thermal decomposition occurs during processing and plasticizing. Therefore, processing aids are important materials for PVC processing. At present, among PVC processing aids, acrylates (ACR) are the most widely used. It has good compatibility with PVC and can be used in main processing methods such as PVC extrusion, injection molding, blow molding, blistering and calendering. 1 to 4% ACR can promote plasticization, reduce PVC plasticization temperature, inhibit melt fracture, improve its fluidity, prolong molding processing stability time, and suppress surface defects such as silver wires caused by pressure fluctuations and flow scars. At the same time, ACR can also improve the light resistance, weather resistance and aging resistance of PVC materials. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/12C08F220/14C08L33/12C08L27/06C08F220/06C08F212/08C08F220/18C08F8/42
Inventor 宋义虎朱肖楠郑强
Owner ZHEJIANG UNIV