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Production method of butylbenzene lithium series anionic polymers

An anionic polymer and anionic polymerization technology, applied in the production field of lithium-butadiene lithium anionic polymer, can solve the problems of high price, high freezing point of solvent, toxicity of benzene, etc.

Inactive Publication Date: 2003-02-05
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these two reports, the freezing point of the solvent benzene is as high as 5.5°C, and it is easy to freeze in winter. Although the freezing point of toluene is lower, reaching minus 94°C, toluene is used as a solvent, which is prone to chain transfer reactions and affects product quality. Both are toxic
[0004] The above solvents for synthesizing lithium-butadiene lithium-based anionic polymers have the following defects in varying degrees: some solvents have a higher freezing point, which is not conducive to organizing industrial production in cold regions; some solvents generally have higher prices, resulting in higher product costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] in N 2 C in a clean stirred round bottom flask 6 Raffinate oil and cyclohexane were formulated into composite solutions according to the following mass ratios: 0 / 100, 10 / 90, 20 / 80, 30 / 70, 40 / 60. After the prepared solution was stirred evenly, it was dehydrated with molecular sieves to below 20ug / g, and the freezing point data of the composite solvent measured according to GB510-83 is listed in Table 1.

[0010] Proportion

[0011] As can be seen from Implementation 1, in the composite solvent with C 6 The addition of raffinate increases the freezing point of the composite solvent system, and when the ratio reaches 40 / 60, the freezing point can reach -47.2°C, which can meet the winter safety production needs in cold regions in northern my country.

Embodiment 2

[0013] Utilize the compound solvent system that implements 1 to prepare, press S / B=30 / 70 (mass ratio), design molecular weight Mn=100,000, carry out linear SBS polymerization synthesis test, test product physical property data is listed in Table 2.

[0014] Table 2 The physical properties of linear SBS products synthesized by complex solvents in different proportions

[0015] * 300% constant elongation strength, tensile strength, elongation at break and permanent deformation are carried out according to the national standard GB / T528-92.

[0016] The Shore hardness is implemented according to the national standard GB / T531-92.

[0017] As can be seen from Example 2, when the composite solvent C 6 The content of raffinate oil increases gradually, and when it is less than 45%, the performance of SBS synthesized by composite solvent is roughly equivalent to that of SBS synthesized by pure cyclohexane (0 / 100). When C 6 When the raffinate oil content exceeds 50%, the ...

Embodiment 3

[0019] Utilize the composite solvent prepared in embodiment 1, press S / B=30 / 70 (mass ratio), design molecular weight Mn=230,000, carry out star-shaped SBS polymerization synthesis test, test product physical property data is listed in Table 3.

[0020] Table 3 The physical properties of star-shaped SBS synthesized by different compounding solvents

[0021] As can be seen from Example 3, in the composite solvent with C 6 Gradual increase of raffinate content, when C 6 When the raffinate oil content is below 40%, the composite solvent has no effect on the star-shaped SBS polymerization reaction and the physical properties of the synthesized product. When C 6 The raffinate oil content reaches 50%, and the tensile strength and hardness of the synthetic product decrease.

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PUM

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Abstract

The present invention provides a production method of butylbenzenelithium series anion polymer, and is characterized by that it adopts the compound solvent formed from cyclodexane and C6 raffinate oil as solvent for anion reaction.

Description

technical field [0001] The invention relates to a production method of lithium-butadiene lithium series anionic polymer. Background technique [0002] Lithium-butadiene-based anionic polymers specifically include SBS, SIS, SEBS, SEPS, Low-cis polybutadiene rubber, solution-polymerized styrene-butadiene rubber or K-resin, etc., in the existing production technology, the solvents used for the production of the above-mentioned styrene-butadiene lithium anionic polymer mainly include: [0003] U.S. Patent 3,078,254 (1963) 3,198,774 (1965) discloses a kind of solvent with cyclohexane or cyclohexane and normal hexane in the ratio of 9:1 and as the production solvent of butylbenzene block copolymer SBS. Among them, pure cyclohexane is the most commonly used solvent, but the freezing point of pure cyclohexane is as high as 6.5°C. Pure cyclohexane is used as a solvent for the production of lithium-butadiene lithium anionic polymers. When organizing production in cold regions in wint...

Claims

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Application Information

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IPC IPC(8): C08F4/48C08F12/08C08F36/06
Inventor 张红星周立新叶强陈铁桥李望明胡中玉
Owner CHINA PETROCHEMICAL CORP
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