Method for producing super-white polyvinyl chloride resin through vinyl chloride suspension polymerization after-treatment

A technology of polyvinyl chloride resin and suspension polymerization, which is applied in the field of ultra-white polyvinyl chloride resin after vinyl chloride suspension polymerization to achieve easy dispersion, good fluidity, and good whitening effect

Active Publication Date: 2017-08-11
TANGSHAN SANYOU CHLOR ALKALI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no method of whitening through the principle of blue light-yellow light complementary optics after polyvinyl chloride is polymerized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for producing ultra-white polyvinyl chloride resin after suspension polymerization of vinyl chloride. According to the mass ratio, 15 parts of absolute ethanol, 2 parts of liquid carbolic acid, 4 parts of "acid blue 90" and 400 parts of water are used to prepare whitening aids ;In the range of 0-80°C, according to the volume ratio, the whitening aid is diluted for dispersion, and each part of the whitening aid is added to 200 times the volume of deionized water, and stirred at a speed of 20-80 r / min for 1 minute, In the SG3 type resin slurry, dilute the auxiliary agent at 1.6L / m 3 slurry, add dilution aid to the stripped slurry and stir evenly. After centrifugation at a speed of 1500-2000r / min and drying at 60°C for 10-15 minutes, the initial whiteness of the product was sampled and tested to be 93.2%, and the aging whiteness of the product tested according to the national standard GB5761 was 88.4%. The initial whiteness of the same batch of samples without po...

Embodiment 2

[0017] A method for producing ultra-white polyvinyl chloride resin after suspension polymerization of vinyl chloride. According to the mass ratio, 15 parts of absolute ethanol, 2 parts of liquid carbolic acid, 5 parts of "acid blue 74" and 500 parts of water are used to prepare whitening aids , dilute 200 times with deionized water to prepare dilution aid.

[0018] In the SG5 type resin slurry, dilute the auxiliary agent by 2L / m 3 slurry, add dilution aid to the stripped slurry and stir evenly. After centrifugation at a speed of 2000r / min and drying at 60°C for 15 minutes, the initial whiteness of the product was sampled and tested to be 94.2%, and the aging whiteness of the product tested according to the national standard GB5761 was 88.3%. The initial whiteness of the same batch of samples without post-treatment of whitening additives is 92.5%, and the aging whiteness of GB5761 is 86.5%.

Embodiment 3

[0020] A method for producing ultra-white polyvinyl chloride resin after suspension polymerization of vinyl chloride, comprising 15 parts of absolute ethanol, 2 parts of liquid carbolic acid, 6 parts of "acid blue 5", and 600 parts of water to configure whitening aids according to the mass ratio, Prepare dilution aid by diluting 200 times with deionized water.

[0021] In the SG8 type resin slurry, dilute the auxiliary agent at 2.4L / m 3 slurry, add dilution aid to the stripped slurry and stir evenly. After centrifugation and drying, the initial whiteness of the product is 93.8% according to the sampling test, and the aging whiteness of the product is 88.3% according to the national standard GB5761. The initial whiteness of the same batch of samples without post-treatment of whitening additives is 92.2%, and the aging whiteness of GB5761 is 86.7%.

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Abstract

The invention relates to a production method of super-white polyvinyl chloride resin, and particularly relates to a method for producing super-white polyvinyl chloride resin through vinyl chloride suspension polymerization after-treatment. The method comprises the following steps of preparing a whitening assistant from the following raw materials in parts by weight: 12-18 parts of ethanol, 1-3 parts of liquid carbolic acid, 4-8 parts of a blue pigment substance and 400-600 parts of deionized water; dispersing and diluting the whitening assistant by using the deionized water; and adding the product to slurry polymerized by polyvinyl chloride, stirring evenly, centrifuging and drying to prepare a super-white polyvinyl chloride resin product. Compared with the prior art, the method has the advantages that the whitening effect is good; the whitening efficiency is high; the whitening assistant is a water-soluble high-dispersion solution and a blue pigment molecule is adsorbed by resin particle fold, so that the yellowing phenomenon is eliminated under the blue light-yellow light complementary action; the pigment molecule is fully dispersed in the slurry, so that the coloring efficiency is greatly improved; and the later resin downstream processing cost is reduced.

Description

technical field [0001] The invention relates to a production method of ultra-white polyvinyl chloride paste resin, in particular to a method for producing ultra-white polyvinyl chloride resin after suspension polymerization of vinyl chloride. Background technique [0002] Domestically produced general-purpose suspension-process polyvinyl chloride resin is widely used in building materials, industrial products, daily necessities, floor tiles, artificial leather, profiles, pipes, packaging, and so on. In most application fields, white polyvinyl chloride plastic products have higher requirements on the whiteness of the resin. For colored plastic products, the whiteness of the resin also affects the coloring performance in the later stage. Therefore, the polyvinyl chloride industry as a whole has higher requirements on the whiteness of the resin. [0003] At present, polyvinyl chloride production enterprises usually use steam stripping to reduce the residual vinyl chloride mon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/20C08L27/06
CPCC08J3/2056C08J2327/06
Inventor 赵琳刘宝东高悦周爱存陈福新桑兆虎苏永学杜建军赵丽颖刘黎王峰周云飞李德军刘洋李明徐建玲孔令媛乔梁吕彦玲赵亮张克强鲍雷雷刘思佳陈国超
Owner TANGSHAN SANYOU CHLOR ALKALI
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