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High molecule dispersants for polychloroethylene synthesis, high molecule dispersants preparation method and applications

A polymer dispersant, polyvinyl chloride technology, applied in chemical instruments and methods, transportation and packaging, dissolution and other directions, can solve the problems of increasing production process consumption, unfavorable material processing and molding, increasing stirring power, etc. The process is simple and easy to implement, which is conducive to the processing of materials and the effect of solving the problem of compatibility.

Inactive Publication Date: 2009-03-18
郑勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, polyvinyl chloride (PVC) is polymerized from vinyl chloride monomer, and its preparation mostly adopts suspension polymerization method, and a small amount of emulsion polymerization method is used. In the preparation of polyvinyl chloride by suspension polymerization method, in order to maintain the porosity of the finished particles And particle size, in order to facilitate the processability of the material, it is often used to increase the stirring power for stirring or increase the amount of dispersant to achieve this purpose, which increases the consumption in the production process to a certain extent
At present, there are also some composite dispersion systems. Although they can improve the particle properties of PVC, there are certain defects in their processability and compatibility with additives, which are not conducive to the processing and molding of materials.

Method used

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  • High molecule dispersants for polychloroethylene synthesis, high molecule dispersants preparation method and applications

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] 1. Prepare the emulsion in a 1 cubic reaction kettle, the steps include: adding

[0017] Deionized water: 280 kg

[0018] DOWFAX 2A1: 6 kg

[0019] Butyl acrylate: 80 kg

[0020] Methyl methacrylate: 180 kg

[0021] Potassium persulfate: 0.1 kg

[0022] Hanging white block: 0.1 kg

[0023] Stir and heat up to the reaction temperature under nitrogen protection, control the temperature at 80°C for two hours, cool down to 55°C and cool to obtain a polymerized emulsion;

[0024] 2. Take 100 kg of polymerized emulsion, put it into an emulsification tank, add 10 kg of carboxymethyl cellulose, 2 kg of hydrated silicon dioxide, and stir for 1 hour to prepare a new polyvinyl chloride synthetic polymer dispersant;

[0025] 3. Take 1% of this dispersant (relative to the mass of vinyl chloride monomer), and 0.5% of polyvinyl alcohol (relative to the mass of vinyl chloride monomer), combine it into a composite dispersion system, add it to deionized water and stir for 30 minutes...

example 2

[0027] 1. Replace the butyl acrylate in Example 1 with n-butyl methacrylate, and keep the others unchanged to obtain the dispersant of the present invention.

[0028] 2. Keeping the other things unchanged, get polyvinyl chloride resin.

example 3

[0030] 1. Replace the methyl methacrylate in Example 1 with styrene and acrylonitrile (styrene and acrylonitrile are used in a mass ratio of 4:1), and polymerize the other materials unchanged to obtain the material of the present invention.

[0031] 2. Keeping the other things unchanged, get polyvinyl chloride resin.

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PUM

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Abstract

The invention discloses a novel macromolecular dispersing agent for synthesization of polyvinyl chloride, and a preparation method and application thereof. The dispersing agent is acrylic macromolecular polymer emulsion containing hydrated silicon dioxide and carboxy cellulose. The dispersing agent is prepared through the following steps: firstly, polymerizing a methacrylate monomer, a methacrylic acid monomer, and a styrene acrylonitrile mixed monomer; and then adding the carboxy cellulose and the hydrated silicone dioxide to the polymerized emulsion. The dispersing agent can be used together with the prior polyvinyl chloride dispersing agent. The dispersing agent can effectively maintain the viodage and particle size of PVC structural particles, solve the problem of mutual dissolution in the processing course of PVC, reduce the processing viscosity of the PVC, and contribute to the machine shaping of materials.

Description

technical field [0001] The invention relates to a chemical auxiliary agent, in particular to a dispersant used in the preparation of polyvinyl chloride. Background technique [0002] At present, polyvinyl chloride (PVC) is polymerized from vinyl chloride monomer, and its preparation mostly adopts suspension polymerization method, and a small amount of emulsion polymerization method is used. In the preparation of polyvinyl chloride by suspension polymerization method, in order to maintain the porosity of the finished particles And particle size, in order to facilitate the processability of the material, it is often achieved by increasing the stirring power for stirring or increasing the amount of dispersant, which increases the consumption in the production process to a certain extent. At present, there are also some composite dispersion systems. Although the particle properties of PVC can be improved, there are certain defects in its processability and compatibility with add...

Claims

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Application Information

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IPC IPC(8): C08F14/06C08F2/20B01F17/52C08L33/04C08L25/08C08L1/26C08K3/36C09K23/52
Inventor 郑勇
Owner 郑勇
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