Method for preparing polyisoprene rubber latex

A technology of polyisoprene and rubber latex, which is applied in the field of rubber, can solve the problems of low efficiency in removing solvent and water, and achieve the effects of avoiding changes in performance and appearance, reducing energy consumption, and improving production efficiency

Active Publication Date: 2017-10-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the problem that prior art removes solvent and the lower efficiency of water when preparing polyisoprene rubber latex, provides a kind of method for preparing polyisoprene rubber latex, and this method can greatly improve The preparation efficiency of latex obtains the polyisoprene rubber latex with stable performance

Method used

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  • Method for preparing polyisoprene rubber latex
  • Method for preparing polyisoprene rubber latex

Examples

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Effect test

preparation example 1

[0065] (1) Preparation of polyisoprene rubber solution

[0066] Add 25kg of refined isoprene and 225kg of dry cyclohexane to the 500L jacketed polymerization reactor fully replaced by high-purity nitrogen, mix well, heat to 40°C while stirring, and add 105.0ml of n-butyllithium to the solution solution (0.8mol / L, the solvent is cyclohexane) to remove impurities in the polymerization system, then add 37.0mL n-butyllithium solution (0.8mol / L, the solvent is cyclohexane) to the solution, and the temperature of the solution is controlled at 50 Within the range of ±5°C, the pressure in the polymerization reactor was controlled to be 0.2±0.05MPa (gauge pressure) and reacted for 180 minutes. After the reaction, add deionized water equimolar with the active organic lithium initiator and continue to stir for 10 minutes to terminate the polymerization reaction, then add a cyclohexane solution of 2,6-di-tert-butyl-p-cresol with a concentration of 20% by weight (wherein, the amount of 2,...

preparation example 2

[0070] Carry out according to preparation example 1 preparation process, difference is, in step (1), polymerization reaction process is continuous reaction process, adopts 3 stills to be connected in series, and the residence time of every still is 1.0 hour, and organic solvent adopts as hexane, obtains concentration: 10% by weight polyisoprene rubber solution. Sampling and analysis of the Mooney viscosity of polyisoprene rubber is 65, the weight average molecular weight is 1.76 million, and the molecular weight distribution index is 2.21. The cis-1,4-structure content of polyisoprene rubber is determined by NMR spectrometer as 84.9%, trans 1,4-structure content is 10.3%, 3,4-structure content is 4.8%. The conversion of isoprene was 100%, as determined by weighing method. The gel content in the polymer was zero.

[0071] And, change the add-on of organic solvent in step (1) and the add-on of water in step (2), make in the gained polyisoprene rubber emulsion (coded as II), th...

preparation example 3

[0073] According to the preparation process of Preparation Example 1, the difference is that the amount of organic solvent added in step (1) and the amount of water added in step (2) are changed so that in the obtained polyisoprene rubber emulsion (coded as III) , the content of the polyisoprene rubber solution is 40% by volume (wherein the content of the organic solvent is about 80% by weight), and the content of water is 60% by volume.

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Abstract

The invention relates to the field of rubber, particularly a method for preparing polyisoprene rubber latex. The method for preparing polyisoprene rubber latex comprises the following steps: (1) synthesizing an organic-solvent-containing polyisoprene rubber solution; (2) adding water, an emulsifier and a pH buffering agent, and emulsifying the obtained mixed solution under the action of mechanical force while controlling the pH value of the emulsion at 9-13, thereby obtaining a polyisoprene rubber emulsion; and (3) enabling the polyisoprene rubber emulsion to continuously pass through a concentrator and a scraper-bearing film evaporator, wherein the inside of the concentrator is provided with a static skimmer and/or a dynamic skimmer, the inside of the scraper-bearing film evaporator is provided with both a static skimmer and a dynamic skimmer, and in addition, at least part of the obtained polyisoprene rubber emulsion is circulated to the inlet of the film evaporator. The method can greatly enhance the latex preparation efficiency, and can obtain the polyisoprene rubber latex with stable performance.

Description

technical field [0001] The invention relates to the field of rubber, in particular to a method for preparing polyisoprene rubber latex. Background technique [0002] Natural rubber latex products have high elasticity, low creep, high tensile strength, high elongation at break, good film-forming properties, etc., and occupy a dominant position in the field of latex products. Although the latex products prepared by natural latex have excellent performance, due to the small amount of protein contained in them, some people, especially those who are often in contact with natural latex products, are prone to allergic reactions or other adverse reactions (such as irritant dermatitis), which will cause pain or discomfort symptoms. [0003] In order to solve the allergy problem caused by natural latex, and at the same time in order to solve the source and cost of natural latex, the development of synthetic latex to replace natural latex has become a very necessary way to produce lat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/07C08C1/12C08C1/075C08L9/00
CPCC08C1/075C08C1/12C08J3/07C08J2309/00
Inventor 贺小进张杰王雪董新民张国娟赵晓冬于浩吕鹏飞董江舟谭金枚胡保利申翠平卢松
Owner CHINA PETROLEUM & CHEM CORP
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