Preparation method of styrene butadiene rubber

A technology of styrene-butadiene rubber and styrene, which is applied in the field of preparation of styrene-butadiene rubber, can solve problems such as low conversion rate and viscosity increase, and achieve the effects of reducing recycling energy consumption, increasing production capacity, and improving primary utilization rate

Active Publication Date: 2018-07-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a kind of preparation method of styrene-butadiene rubber, to solve the problem of low conversion rate caused by viscosity increase when adopting emulsion polymerization to prepare styrene-butadiene rubber in the prior art

Method used

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  • Preparation method of styrene butadiene rubber
  • Preparation method of styrene butadiene rubber
  • Preparation method of styrene butadiene rubber

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preparation example Construction

[0037] The specific steps of the above-mentioned preparation method provided by the present invention can adopt common steps in the art of polystyrene butadiene emulsion. In a preferred embodiment, the preparation method includes the following steps: mixing styrene, butadiene, soft water, emulsifier, reducing agent, molecular weight regulator, activator and electrolyte to obtain a mixed solution; adding an initiator for emulsion polymerization; when the conversion rate of the total monomers of the emulsion polymerization reaches 58-62%, adding an aqueous solution of potassium salt to the reaction system of the emulsion polymerization; and when the conversion rate of the total monomers of the emulsion polymerization reaches 68-72% , add a terminator to the emulsion polymerization reaction system to terminate the emulsion polymerization, and then obtain styrene-butadiene rubber. In this way, the initiator can be added to carry out polymerization after the reaction system is homo...

Embodiment 1

[0042] In the polymerization water bath, a 350ml polymerization bottle was used, and the polymerization bottle was replaced with vacuum and nitrogen. Add soft water, emulsifier, electrolyte, molecular weight regulator, reducing agent, activator, styrene, butadiene into the polymerization bottle, when the temperature of the polymerization bottle drops to 4.5°C, add hydrogen peroxide p-menthane to carry out polymerization experiment. When the conversion rate reaches 70%, a terminator is added, and stirring is continued for 0.5 h to terminate the polymerization reaction. Take a sample for viscosity testing.

[0043] The above polymerization was carried out at 4.5°C based on the following recipe.

[0044]

[0045] When the conversion rate reaches 60%, add mass concentration 8×10 -4 When potassium chloride aqueous solution is the total mass fraction of soft water 2%, the polymer emulsion viscosity is as follows:

[0046]

[0047]

[0048] Note: "When the conversion rat...

Embodiment 2

[0050] In the polymerization water bath, a 350ml polymerization bottle was used, and the polymerization bottle was replaced with vacuum and nitrogen. Add soft water, emulsifier, electrolyte, molecular weight regulator, reducing agent, activator, styrene, butadiene into the polymerization bottle, when the temperature of the polymerization bottle drops to 5.5°C, add hydrogen peroxide p-menthane to carry out polymerization experiment. When the conversion rate reaches 68%, a terminator is added, and stirring is continued for 1 h to terminate the polymerization reaction. Take a sample for viscosity testing.

[0051] The above polymerization was carried out at 5.5°C based on the following recipe.

[0052]

[0053] When the conversion rate reaches 58%, add mass concentration 1×10- 4 When potassium chloride aqueous solution is the total mass fraction of soft water 2%, the polymer emulsion viscosity is as follows:

[0054] project

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Abstract

The invention provides a preparation method of styrene butadiene rubber. The preparation method comprises the following steps: performing emulsion polymerization of styrene and butadiene, wherein whenthe conversion rate of total monomers for emulsion polymerization reaches 58-62%, a sylvite aqueous solution is added into the reaction system of emulsion polymerization, and reacting is further conducted to obtain styrene butadiene rubber. In the method, viscosity of a polymerization system with a high conversion rate can be controlled to a viscosity level with low conversion rate, then the viscosity of the system is kept at a relatively low state, and the problems of performance degradation of the styrene butadiene rubber and decrease of latex heat transfer and stability caused by excessively high viscosity are relieved. Thus, the conversion rate of emulsion polymerization can be improved while the product performance and operation stability are maintained. The one-time utilization rateof the monomers is increased, the recycling energy consumption is reduced, and the production capacity of the polymerization equipment can be enhanced; and therefore, the method has great significance.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a preparation method of styrene-butadiene rubber. Background technique [0002] Due to its excellent mechanical properties and good processing performance, styrene-butadiene rubber has become a general-purpose synthetic rubber with the largest production capacity, output and consumption in the world. Among them, emulsion polystyrene butadiene rubber accounts for 85% of its total output and is an important type of styrene butadiene rubber. [0003] During the preparation process of the existing emulsion polystyrene butadiene rubber, the viscosity of the polymerization system increases with the increase of the conversion rate of the total monomers of the emulsion polymerization. This will lead to a deepening of the branching degree, and its rubber properties will gradually deteriorate. At the same time, the increase in viscosity will also affect the heat transfer and st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/10C08F212/08C08F2/38
CPCC08F2/38C08F236/10C08F212/08
Inventor 孙继德殷兰庞建勋李永茹王秀芝侯军刘洪伟郭睿达高微
Owner PETROCHINA CO LTD
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