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Dispersing agent and preparation method thereof

A technology of dispersant and initiator, which is applied in the field of dispersant for chlorinated polyethylene and its preparation, can solve problems such as condensation kettle and large HLB, and achieve the effects of lower reaction temperature, low solid content, and reduced amount of coarse material

Inactive Publication Date: 2017-06-30
ZIBO VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The relative molecular weight of the modified comonomer is different for different purposes. PAA with a relative molecular weight in the range of about 500-5000 is mainly used as a dispersant, but due to the strong hydrophilicity of -COOH in its molecule, its HLB Larger, it is easy to be hydrophilic and cause condensation during the production process, which is a technical problem in the production process of acrylic dispersants

Method used

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  • Dispersing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Add 500~700Kg of water, 0.1~8Kg of sodium oleate, 100~200Kg of acrylic acid, heat to 40℃~70℃, add initiator and comonomer methyl methacrylate 10~60Kg dropwise in a 1-ton reactor , React at 70℃~90℃ for 20~60 minutes. Cool down to 40°C and discharge.

[0028] After testing, its viscosity average molecular weight is: 500~5000

Embodiment 2

[0030] Add 500~700Kg of water to a 1 ton reaction kettle, add 0.1~8Kg of K12, 100~200Kg of acrylic acid, and heat to 30℃~70℃. Add initiator and comonomer methyl methacrylate 10~ 60Kg, at 70℃~90℃, react for 20~60 minutes. Cool down to 40°C and discharge.

[0031] After testing, its viscosity average molecular weight is: 500~5000

Embodiment 3

[0033] Add 500~700Kg of water to a 1 ton reaction kettle, add 0.1~8Kg of ABS-Na, 100~200Kg of acrylic acid, heat to 40℃~70℃, add the initiator and comonomer methyl methacrylate dropwise in turn 10~60Kg, at 70℃~90℃, react for 20~60 minutes. Cool down to 40°C and discharge.

[0034] After testing, its viscosity average molecular weight is: 500~5000

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Abstract

The invention discloses a dispersing agent for chlorinated polyethylene. A certain quantity of water, emulsifiers and acrylic acid are added into a reactor, initiators and copolymerized monomer are added dropwise, reaction is performed at the temperature of 40-90 DEG C, the emulsifiers can be selected from peregal and K12, or peregal and ABS-Na or sodium oleate, the initiators can be selected from persulphuric acid initiators and can be ammonium persulfate, potassium persulfate and sodium persulfate, and the copolymerized monomer can be selected from one or two of methyl methacrylate, ethyl methacrylate, styrene and diethylbenzene. The dispersing agent is high in lipophilicity, low in solid content and good in dispersing effect and solves the problems of poor dispersing effect and narrow use range of sodium polyacrylate (PAA) under acidic conditions, and the cost of the dispersing agent is reduced.

Description

[0001] (1) Technical field [0002] The invention relates to a dispersant, in particular to a dispersant for chlorinated polyethylene and a preparation method thereof. [0003] (2) Background technology [0004] Chlorinated polyethylene (CPE) is a modified product of chlorinated high-density polyethylene. The production process of chlorinated polyethylene generally includes acid phase suspension method, aqueous phase suspension method, solid phase method and solution method, etc. The aqueous phase suspension method is Commonly used production methods require the addition of a certain amount of dispersant in the production process. The quality of the dispersant has a huge impact on the quality of the product. It is mainly manifested in: the pressure of chlorine gas or the amount of chlorine gas and the amount of coarse materials directly determine the quality of the product. inferior. At this stage, the main component of the special dispersant is sodium polymethacrylate, which has a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/14C08F220/18C08F212/36C08F212/08C08F2/26C08F2/30C08F8/22C08F110/02B01F17/52C09K23/52
CPCC08F2/26C08F2/30C08F8/22C08F220/06C09K23/00
Inventor 孟海涛
Owner ZIBO VOCATIONAL INST
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