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Method for synthesizing polyvinyl chloride modifier

A technology of polyvinyl chloride resin and synthesis method, which is applied in the field of synthesis of polyvinyl chloride resin modifiers, and can solve the problems of long reaction period, unstable polymerization system, and increased difficulty of the seed emulsion polymerization process

Active Publication Date: 2009-10-14
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 parts

[0059] Styrene 28 parts

[0060] Emulsifier 0.37 parts

[0061] Potassium persulfate 0.4 part

[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 hou...

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 part

[0073] Tertiary dodecyl mercaptan 0.25 parts

[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 about ...

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Abstract

The invention relates to a synthesis method of an impact modifier butadiene, styrene and methyl methacrylate terpolymer for polyvinyl chloride resin. The method is to firstly prepare an emulsifier for styrene-butadiene polymerization, and adjust The solid content of the electrolyte and latex in the emulsifier is used to synthesize styrene-butadiene latex with an average particle size in the range of 80-280nm. The prepared styrene-butadiene latex is subjected to three-step graft polymerization, the first step is to graft styrene, and the second step is to graft Graft ethyl acrylate, three-step graft methyl methacrylate, control the cross-linking degree of styrene-butadiene latex during the polymerization of styrene-butadiene, reduce stress whitening, introduce grafting agent in the process of three-time graft polymerization, improve The coverage of the grafted monomer on the rubber surface, and finally after coagulation and drying, the MBS resin is obtained. The MBS resin synthesized by this method is used to modify PVC, which has good transparency and excellent resistance to stress whitening Performance and excellent impact resistance, and the polymerization reaction system is stable, making it possible to increase the solid content of styrene-butadiene latex.

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 th...

Claims

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Application Information

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Patent Type & Authority Patents(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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