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Powdery styrene-butadiene rubber preparation method

A technology for powdered styrene-butadiene rubber and styrene-butadiene latex, which is applied in the field of rubber synthesis, can solve the problem of excessively high additive dosage, and achieve the effects of reducing dosage, reducing viscoelasticity and improving plasticity

Active Publication Date: 2018-12-11
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The white carbon black content of this technology is as high as 20% to 30%, and there is still the problem of excessive additives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Preparation of reducing agent aqueous solution: Weigh 10 parts of water, add 0.35 part of complex ferrous salt under stirring, and then add 0.5 part of dibasicum powder to dissolve it.

[0044] (2) Add 1000g of deionized water and 1000g of styrene-butadiene latex (SBR1502) into a 10L polymerization kettle, fill with nitrogen to replace the air, add 108g of reducing agent aqueous solution, and heat up while stirring. After stirring for more than half an hour, when the temperature reaches 50°C, Slowly add 20g of DIP and maintain the reaction temperature for 2 hours to obtain surface cross-linked styrene-butadiene latex. Sampling was dried, and its insoluble content in toluene was measured to be 95%.

[0045] (3) Move the surface cross-linked styrene-butadiene latex into a 10L coagulation kettle, add 500g of water under stirring, then add 5g of antioxidant 4010, heat up to 70°C, slowly add 90g of 20% sodium chloride solution, and after the latex is granulated, Slowly ...

Embodiment 2

[0050] (1) Preparation of reducing agent aqueous solution: Weigh 10 parts of water, add 0.2 part of complex ferrous salt under stirring, and then add 0.4 part of white powder to dissolve it.

[0051] (2) Add 1000g of deionized water and 1000g of styrene-butadiene latex (SBR1502) into a 10L polymerization kettle, fill with nitrogen to replace the air, add 120g of reducing agent aqueous solution, and heat up while stirring. After stirring for more than half an hour, when the temperature reaches 50°C, Slowly add 29g of DIP, maintain the reaction temperature for 2 hours, cross-link the styrene-butadiene latex on the surface, take a sample and dry it, and measure its insoluble content in toluene to be 99%.

[0052] (3) Move the surface cross-linked styrene-butadiene latex into a 10L coagulation kettle, add 500g of water under stirring, then add 5g of antioxidant 264, heat up to 70°C, slowly add 90g of 20% sodium chloride solution, and after the latex is granulated, Slowly add 120 g...

Embodiment 3

[0057] (1) Preparation of reducing agent aqueous solution: Weigh 10 parts of water, add 0.5 part of complex ferrous salt under stirring, and then add 0.6 part of white powder to dissolve it.

[0058] (2) Add 1000g of deionized water and 1000g of styrene-butadiene latex (SBR1502) into a 10L polymerization kettle, fill with nitrogen to replace the air, add 60g of reducing agent aqueous solution, and heat up while stirring. After stirring for more than half an hour, when the temperature reaches 40°C, Slowly add 15g of DIP, maintain the reaction temperature for 1 hour, cross-link the styrene-butadiene latex on the surface, take a sample and dry it, and its insoluble content in toluene is 91%.

[0059] (3) Move the surface cross-linked styrene-butadiene latex into a 10L coagulation kettle, add 500g of water under stirring, then add 5g of antioxidant 2264, heat up to 60°C, slowly add 90g of 20% sodium chloride solution, and after the latex is granulated, Slowly add 120 g of 10% calc...

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Abstract

The invention belongs to the field of rubber synthesis, and particularly relates to a powdery styrene-butadiene rubber preparation method, which comprises: (1) sequentially adding water, styrene-butadiene latex and a reducing agent aqueous solution into a polymerization kettle, carrying out stirring heating, adding an oxidizing agent, and carrying out a cross-linking reaction to obtain surface-cross-linked styrene-butadiene latex; and (2) adding water and an anti-aging agent to the surface-cross-linked styrene-butadiene latex, then adding a primary agglomeration agent and a secondary agglomeration agent, carrying out agglomeration to obtain a powder polymer aqueous suspension, dewatering, washing, screening, and drying. According to the present invention, the chemical cross-linking is performed on the surface of the styrene-butadiene latex particles, such that the number of the rubber molecules active points on the surface of the particles is reduced, the plasticity of the surface of the particles is improved, the viscoelasticity of the surface is reduced, the deformation of the product is reduced, the long-lasting and stable chemical separation effect is generated between the rubber particles, the consumption of the inorganic separation agent is low, the influence on the performance of the rubber product is low, and the prepared powdery styrene-butadiene rubber has characteristics of uniform particles, good fluidity and good storage stability.

Description

technical field [0001] The invention belongs to the field of rubber synthesis, and in particular relates to a preparation method of powdered styrene-butadiene rubber. Background technique [0002] According to the definition of British Standard BS2955-1993, polymers with a particle size of less than 1mm are called powder polymers. Rubber with particle size less than 1mm is powder rubber. From the perspective of rubber processing technology, powder rubber has quite a few advantages: such as short mixing time, low power consumption, low discharge temperature and good final dispersion. Powdered rubber can also be piped and weighed automatically like carbon black and other fillers, which helps to improve the automation of factory mixing production. [0003] Compared with block or sheet rubber, the pulverization of rubber only changes the form of rubber, but does not change the basic properties of rubber. Powdered rubber can not only prepare rubber products, but also be used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/26C08J3/24C08J3/16C08L9/06C08C1/15C08C1/02
CPCC08C1/02C08C1/15C08J3/16C08J3/245C08J3/26C08J2309/06
Inventor 解洪梅袁辉志
Owner CHINA PETROLEUM & CHEM CORP
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