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Method for improving whiteness of polyvinyl alcohol

A technology of polyvinyl alcohol whiteness and polyvinyl alcohol, applied in the field of polyvinyl alcohol preparation technology, can solve the problems of product yellowing, high drying efficiency, low volatile content, etc., achieve high whiteness, improve production efficiency, and accelerate removal Effect

Active Publication Date: 2021-06-25
内蒙古双欣环保材料股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to solve the above problems, provide a method for improving the whiteness of polyvinyl alcohol, solve the problem that PVA causes the product to turn yellow, and propose a The new polyvinyl alcohol drying process ensures the whiteness of the product, lower volatile matter and higher drying efficiency

Method used

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  • Method for improving whiteness of polyvinyl alcohol
  • Method for improving whiteness of polyvinyl alcohol
  • Method for improving whiteness of polyvinyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Embodiment 1: Get six parts of polyvinyl alcohol semi-finished product 8~10g of degree of alcoholysis ≥ 99.0%, put into 6 weighing bottles respectively, and put it into the oven that temperature is 120 ℃ and dry it, Take out a weighing bottle every 5Min and analyze the samples in it. After analysis and detection, with the prolongation of drying time, the whiteness of the sample gradually decreased, and the color gradually deepened. The sample began to change color after 2 hours of drying, and the whiteness of the sample with a drying time of 3 hours was 80.2%.

Embodiment 2

[0107] Embodiment 2: Get six parts of polyvinyl alcohol semi-finished product 8~10g of degree of alcoholysis ≥ 99.0%, put into 6 weighing bottles respectively, and put it into the oven that temperature is 160 ℃ and dry it, Take out a weighing bottle every 5Min and analyze the samples in it. After analysis and detection, with the prolongation of the drying time, the whiteness of the sample rapidly and gradually decreased, and the color gradually deepened. The sample began to change color when the drying time was 10 minutes, and the whiteness of the sample with a drying time of 30 minutes was 65.0%. It can be seen that the drying temperature is too high, which is not conducive to maintaining the whiteness of polyvinyl alcohol products.

Embodiment 3

[0108] Embodiment 3: Get six parts of polyvinyl alcohol semi-finished product 8~10g of degree of alcoholysis ≥ 99.0%, put into 6 weighing bottles respectively, and put it into the oven that temperature is 170 ℃ and dry it, Take out a weighing bottle every 5Min and analyze the samples in it. After analysis and detection, with the prolongation of drying time, the whiteness of the sample decreased rapidly, and the color gradually deepened. The sample began to change color when it was dried for 5 minutes, and the whiteness of the sample with a drying time of 30 minutes was 50.0%. It can be seen that the drying temperature is too high, which is not conducive to maintaining the whiteness of polyvinyl alcohol products.

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Abstract

The invention relates to a method for improving whiteness of polyvinyl alcohol. The method comprises the following steps of: adding a protective solution into a polyvinyl alcohol semi-finished product, and drying. According to the method for improving the whiteness of polyvinyl alcohol, the problems that a final finished product becomes yellow, the whiteness of the product is reduced and the like due to too high drying temperature, long drying time or impurities in the PVA can be effectively solved, meanwhile, volatile components in the preparation process of polyvinyl alcohol can be effectively removed, and polyvinyl alcohol resin with high whiteness and ultra-low volatile components can be obtained.

Description

technical field [0001] The invention belongs to the field of polyvinyl alcohol preparation technology, and in particular relates to a method for improving the whiteness of polyvinyl alcohol, and at the same time, can effectively remove volatile matter in the preparation process of polyvinyl alcohol. Background technique [0002] Polyvinyl alcohol (PVA) is a water-soluble high molecular polymer, which contains both a hydrophobic group - acetyl group and a hydrophilic group - hydroxyl group, so it is widely used in various industries. When using the belt alcoholysis process to prepare polyvinyl alcohol, polyvinyl acetate resin (PVAc) and alkali methanol are mixed evenly in the mixer, cast to the belt alcoholysis machine for alcoholysis to produce semi-finished polyvinyl alcohol, and then through a powder machine, The second powder machine is crushed into granules, and enters the screw extruder to squeeze out the alcoholysis waste liquid of polyvinyl alcohol (mainly methanol an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F118/08C08F8/00C08F6/10
CPCC08F6/001C08F8/00C08F118/08C08L29/04
Inventor 张飞雄李金龙姜维余德宝李桃景雁凤徐晓云李婷王杰韩天宇
Owner 内蒙古双欣环保材料股份有限公司
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