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Method for reducing viscosity of conjugated diene polymer solution

A technology of polymer solution and conjugated diene, applied in the field of reducing the viscosity of conjugated diene polymer solution

Active Publication Date: 2015-07-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But use carboxylic acid (salt), sulfonic acid (salt) etc. to reduce the viscosity of polymer solution and there is no report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0035] In the specification of this application, all parts and percentages are by weight unless expressly stated otherwise.

[0036] test

[0037] In the present invention, the molecular weight and the molecular weight distribution of the conjugated diene polymer of synthesis adopt Shimadzu LC-10AT type gel permeation chromatography (GPC) to measure, THF is mobile phase, narrow distribution polystyrene is standard sample, temperature is 25°C.

[0038] The viscosity of the polymer solution was measured by Mitsubishi HAAKE C35 at a test temperature of 50°C.

[0039] The treatment method is the same for the polymer solution and the polymer solution after adding the viscosity reducer. Use steam and hot water to remove unreacted monomers and solvents in the polymer solution by steam stripping to obtain a polymer solid sample containing water and a very small amount of solvent and monomer, and then use an open mill to dry to obtain the product. The Mooney viscosity of the polyme...

Embodiment 1

[0041] Example 1 (add 0.2% viscosity reducer)

[0042] Polyisoprene was synthesized by using neodymium naphthenate / triisobutylaluminum / sesquialuminum rare earth (molar ratio 1 / 15 / 2) catalyst system, isoprene as monomer and cyclohexane as solvent. The polymerization reaction was carried out under the protection of nitrogen, and 350 g of isoprene, 1938 g of cyclohexane and 45 g of catalyst were sequentially added to a 5L polymerization kettle, the monomer concentration was 15 wt%, and the catalyst dosage was 1.9×10 -6 molNd / g IP, the polymerization reaction temperature is 25°C, and the reaction time is 1.5 hours later. In the polyisoprene solution, the weight percentage of the polymer is 14.25%. The polyisoprene has a weight average molecular weight of 1,654,102 and a molecular weight distribution of 3.1. The viscosity of the polymer solution was 12000 cp. The ash content of the product is 0.46%, and the tensile strength of the vulcanized rubber is 26.0MPa.

[0043] In the...

Embodiment 2

[0045] Example 2 (add 0.4% viscosity reducer)

[0046] Polybutadiene was synthesized by neodecanoate / diisobutylaluminum hydride / diethylaluminum chloride (molar ratio 1 / 18 / 3) rare earth catalyst system, butadiene as monomer and hexane as solvent. The polymerization reaction was carried out under the protection of nitrogen, and 800 g of butadiene, 3858 g of hexane and 48 g of catalyst were successively added into a 10L polymerization kettle, the monomer concentration was 17wt%, and the catalyst consumption was 2.2×10 -6 molNd / gIP, the polymerization reaction temperature is 50°C, and the reaction time is 1.5 hours. In the polybutadiene solution, the weight percentage of the polymer is 16.4%. The polybutadiene has a weight average molecular weight of 654,102 and a molecular weight distribution of 2.7. The viscosity of the polymer solution was 14000 cp. The ash content of the product is 0.48%, and the tensile strength of the vulcanized rubber is 17.0MPa.

[0047] In 3L reacto...

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Abstract

The invention provides a method for reducing viscosity of conjugated diene polymer solution, which comprises the step of adding an ionic surfactant into the conjugated diene polymer solution. The method provided by the invention is simple in operation, is easy to implement on an industrial production device, and can solve problems that the conjugated diene polymer solution with high viscosity is difficult to transport and consumes a large amount of energy. The method can play a role in stopping polymerization reaction while realizing reduction of viscosity of conjugated diene polymer solution; and the viscosity reduction treatment has no influence on the properties of the final product.

Description

technical field [0001] This invention relates to a method for reducing the viscosity of solutions of conjugated diene polymers. The invention is especially suitable for reducing the glue viscosity of high-viscosity conjugated diene polymers. Background technique [0002] Ziegler-Natta catalysts can initiate homopolymerization or copolymerization of conjugated dienes to synthesize stereoregular polymers. Conjugated diene homopolymers or copolymers synthesized by coordination polymerization, such as polybutadiene, polyisoprene and butadiene-isoprene copolymer, have high linear structure and high cis structure content (>96%), high molecular weight and other characteristics, its structure is regular, and its physical and mechanical properties are excellent. The microstructure and macroscopic properties of polyisoprene rubber synthesized by directional polymerization of isoprene initiated by Ziegler-Natta catalyst are close to those of natural rubber, and it is an ideal subs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F36/04C08F6/06C08F136/06C08F136/08C08F236/06C08F236/08
Inventor 张杰李传清谭金枚梁爱民徐林于国柱欧阳素芳杨亮亮赵姜维辛益双
Owner CHINA PETROLEUM & CHEM CORP
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