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Preparation method of vinyl chloride-vinyl acetate resin with uniformly distributed blocks

A technology of vinyl acetate copolymer resin with uniform distribution, applied in the production of bulk chemicals, etc., can solve the problems of uneven block distribution, dense surface film, low internal porosity, etc., to achieve non-toxic production process, increase porosity, etc. , recycling simple effects

Active Publication Date: 2021-07-27
内蒙古鄂尔多斯电力冶金集团股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, PVVA currently produced in China generally has the disadvantages of uneven block distribution, poor solubility, dense surface film, low internal porosity, and uneven channels, which limit its application in processing and other high-end fields. Therefore, there is an urgent need for It improves quality and efficiency

Method used

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  • Preparation method of vinyl chloride-vinyl acetate resin with uniformly distributed blocks
  • Preparation method of vinyl chloride-vinyl acetate resin with uniformly distributed blocks
  • Preparation method of vinyl chloride-vinyl acetate resin with uniformly distributed blocks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Count 0.9kg VC and 0.1kgVAc monomer into the reactor, add 1.0kg supercritical fluid CO according to the first group formula in Table 1 2 , 20.0g supercritical enhancer C 15 h 31 ArOH, 0.5g initiator cumene hydroperoxide / Na 2 S 2 o3 , add 1.5g of reaction auxiliary PVA, seal the reaction kettle, stir and heat up to 30°C, then raise the temperature to 50°C at a rate of 0.4°C / min, and the polymerization pressure is 10MPa. After 4 hours of reaction, add the terminator p-tert-butyl o Hydroquinone 1.5g, after stirring for 10min, open the valve to volatilize the solvent and additives in about 15s, and the gas enters the gas separation and recovery system. The obtained solid is washed with water and dried to obtain the pure product copolymerized resin.

Embodiment 2～ Embodiment 16

[0040] With reference to the method described in Example 1, according to the raw material formula ratio and process workpiece parameters recorded in Tables 1 to 3 (the data of the first group in the corresponding Tables 1 to 3 in Embodiment 1), replace them with 2 to 16 respectively. The data of the group correspond to Example 2 to Example 16.

[0041] Table 1 Recipe table

[0042]

[0043] Note: bpy means cuprous chloride / bipyridine

[0044] Table 2 ratio table

[0045]

[0046] Table 3 process condition table

[0047]

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Abstract

The invention relates to a method for preparing vinyl chloride-vinyl acetate copolymer resin with uniformly distributed blocks by a supercritical method. The method comprises the following steps of: polymerizing a supercritical fluid serving as a reaction medium and a supercritical enhancer serving as an auxiliary agent for a certain time under the action of an initiator and in the presence of a polymerization additive, adding a terminating agent, and completing pressure relief within a certain period of time to obtain the vinyl chloride-vinyl acetate copolymer resin with uniformly distributed blocks. The vinyl chloride-vinyl acetate copolymer resin prepared by the method is uniform in block distribution, good in solubility, porous in surface and uniform in internal pore channels.

Description

technical field [0001] The invention relates to a preparation method of vinyl chloride-vinyl acetate copolymer resin, in particular to a method for preparing vinyl chloride-vinyl acetate copolymer resin with uniform block distribution by a supercritical method. Background technique [0002] Vinyl chloride-vinyl acetate copolymer resin (PVVA), also known as vinyl chloride resin, is made by copolymerizing vinyl chloride (VC) and vinyl acetate (VAc) mainly based on vinyl chloride segments. Because the resin has excellent properties such as internal plasticization and low melting temperature, it is widely used in floor tiles, card base sheets, coatings, inks, adhesives and other fields. Vinyl chloride resin is one of the most important varieties of vinyl chloride copolymers. Resins are classified according to their synthesis methods, including suspension polymerization, emulsion polymerization and solution polymerization. [0003] Compared with polyvinyl chloride resin, the VAc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/06C08F218/08C08F2/00
CPCC08F214/06C08F218/08C08F2/00Y02P20/54
Inventor 钱荧辉邓宇赵长森牛强
Owner 内蒙古鄂尔多斯电力冶金集团股份有限公司
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