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Method for synthesizing polyvinyl chloride modifier

A technology of polyvinyl chloride resin and synthesis method, applied in the field of synthesis of polyvinyl chloride resin modifier, can solve the problems of unstable polymerization system, increased difficulty, limitation of solid content of styrene-butadiene latex and the like

Active Publication Date: 2008-03-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of the above process are that the diameter expansion process leads to unstable polymerization system, and rubber blocks are easy to be produced during the polymerization process. In order to solve the problem of system stability, it is necessary to emulsify the grafted monomers, and then carry out grafting, which increases the process time. The difficulty on the surface; the seed emulsion polymerization process has a long reaction cycle, and these two processes have certain restrictions on the solid content of styrene-butadiene latex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of emulsifier for styrene-butadiene latex

[0024] In the normal pressure kettle that stirs is equipped with, add each material by following proportioning: (below all are parts by weight on a dry basis)

[0025] 78 parts of deionized water

[0026] Potassium oleate 22 parts

[0027] Sodium chloride 4 parts

[0028] Diffuser NNO 3.5 parts

[0029] Add deionized water into an atmospheric pressure kettle, control the reaction temperature to 50°C, add potassium hydroxide, oleic acid, sodium chloride and a diffusing agent in sequence, and react for 30 minutes to obtain an emulsifier for styrene-butadiene latex.

[0030] (2) Synthesis of styrene-butadiene latex with suitable particle size

[0031] In the pressure polymerization kettle equipped with agitation, add each material in turn according to the following formula (the following are parts by weight on a dry basis):

[0032] Butadiene 72 parts

[0033] Styrene 28 parts

[0034] Emulsifier 0.37 parts...

Embodiment 2

[0055] In the synthetic formula of styrene-butadiene latex in embodiment 1, the designed solid content of styrene-butadiene latex is increased to 45%. The preparation of emulsifier and the synthesis of MBS grafted latex are all the same as in embodiment 1. The performance test results are shown in Table 1. The latex synthesis method is detailed as follows:

[0056] Synthesis of SBR Latex

[0057] In the pressure polymerization kettle equipped with agitation, add each material in turn according to the following formula (the following are parts by weight on a dry basis):

[0058] Butadiene 72

[0059] Styrene 28 parts

[0060] Emulsifier 0.37 parts

[0061] Potassium persulfate 0.4 parts

[0062] Tertiary dodecyl mercaptan 0.25 parts

[0063] 123 parts of deionized water

[0064] After turning on the stirring and replacing it with nitrogen twice, after the reaction was heated up, the polymerization was stirred and polymerized at a constant temperature for about 16 hours, t...

Embodiment 3

[0066] In the synthetic formula of styrene-butadiene latex in embodiment 1, the design solid content of latex is increased to 55%, the preparation of emulsifier and the synthesis of MBS grafted latex are all the same as in embodiment 1, and the performance test results are shown in Table 1. Synthesis of styrene-butadiene latex The method is detailed as follows:

[0067] Synthesis of SBR Latex

[0068] In the pressure polymerization kettle equipped with agitation, add each material in turn according to the following formula (the following are parts by weight on a dry basis):

[0069] Butadiene 72 parts

[0070] Styrene 28 parts

[0071] Emulsifier 0.37 parts

[0072] Potassium persulfate 0.4 parts

[0073] 0.25 parts of tertiary dodecyl mercaptan

[0074] 82.6 parts of deionized water

[0075] After turning on the stirring and replacing it with nitrogen twice, after the reaction was heated up, the polymerization was stirred and polymerized at a constant temperature for ab...

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Abstract

The present invention relates to the synthesis method for a PVC resin anti-impact modifier butadiene, styrene, and methyl methacrylate copolymer. The preparation method is that a styrene butadiene polymerization emulsifier is firstly prepared. Then the solid content of electrolyte and latex in the emulsion is adjusted so as to generate styrene-butadiene rubber latex through polymerization reaction, the average particle diameter of which is from 80 to 280 nanometers. Then the prepared styrene-butadiene rubber latex experiences a three-step graft polymerization: the first step is styrene graft, the second ethyl acrylate graft and the last step methyl methacrylate graft. The cross-linking degree of the styrene-butadiene rubber latex is controlled in the styrene butadiene polymerization reaction so as to reduce stress blushing. In the third graft polymerization reaction, grafting agent is introduced in so as to enlarge the coverage of graft monomer on the rubber surface. MBS resin is finally obtained through agglomeration and drying treatment. The MBS resin obtained by the present invention is of good transparency, excellent stress blushing ability and anti-impact capability. The polymerization reaction system of the present invention is stable, which makes the content enhancement of the styrene-butadiene rubber latex possible.

Description

technical field [0001] The invention relates to a polyvinyl chloride (PVC) resin impact modifier butadiene, styrene, methyl methacrylate terpolymer ( referred to as MBS) synthetic method. Background of the invention [0002] MBS resin is a terpolymer prepared by emulsion graft polymerization of butadiene, styrene and methyl methacrylate. It has a typical core-shell structure in submicroscopic morphology. The core is a diameter of 10--300nm The spherical core of the rubber phase of the rubber phase, the outer shell is formed by grafting styrene and methyl methacrylate monomers. Since the solubility parameters of methyl methacrylate and polyvinyl chloride are similar, between polyvinyl chloride and rubber particles It acts as an interfacial adhesive and forms a homogeneous phase in the process of mixing with PVC, while the rubber phase is distributed in the continuous medium of PVC in the form of particles. [0003] From the perspective of the inherent characteristics of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F279/02C08F2/22C08L27/06
Inventor 李晶周超王硕赵金德李金英陈继新张辉
Owner BC P INC CHINA NAT PETROLEUM CORP
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