Liquid rubber and preparation method thereof

A liquid rubber and olefin technology, applied in the field of liquid rubber and its preparation, can solve the problems of substandard yellowness index, complicated treatment process and increased production cost, etc.

Active Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the yellowness index of hydrogenated polymers treated by the inventive method meets the requirements, the treatment process is complicated, especially after treatment with water and carbon dioxide, excess ammonia must be used for neutralization, and the pH value of the aqueous phase after treatment with ammonia must be 9-12 , otherwise the yellow index of the product will not meet the standard, which will increase the production cost of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] The invention provides a method for preparing liquid rubber, which comprises the following steps: (1) polymerizing olefins under anionic polymerization conditions in the presence of an organolithium compound and a non-polar organic solvent; the organolithium compound and the The mol ratio of said olefin is 1: 70-1850; (2) the solution that step (1) polymerization obtains is mixed with water and / or C simultaneously or successively 1 -C 6 Alcohol and gas containing 10-100% by volume of carbon dioxide are contacted, and then the contacted product is heated and / or vacuum-dried in the presence of an anti-aging agent and under stirring conditions, relative to 1 mole of the step (1) The organolithium compound, the water and / or C 1 -C 6 The consumption of the alcohol is 0.5-1.5 moles, and the consumption of the carbon dioxide is 0.5-2 moles. In a preferred situation, relative to 1 mole of the organolithium compound in step (1), the water and / or C 1 -C 6 The amount of alcoh...

Embodiment 1

[0026] (1) In a 5L polymerization reactor (jacketed) after replacing the internal gas with high-purity nitrogen, add 200g of isoprene (purified by vacuum distillation) and 1800g of cyclohexane and mix evenly to obtain a solution, and heat it under stirring The solution was brought to 50° C., and 45 mL of n-butyllithium (0.1 mol / L, the solvent was cyclohexane) was added to the solution, and then the temperature of the solution was controlled at 50-70° C. for 120 minutes.

[0027] (2) Add 0.08mL of deionized water to the solution after the polymerization reaction under stirring, and simultaneously feed carbon dioxide (purity greater than 99.9% by weight) into the solution after the polymerization reaction at a flow rate of 10mL / min for 10 minutes, continue Stir for 5 minutes, then add 1 g of 2,6-di-tert-butyl-p-cresol. The vacuum degree in the reaction kettle was set at -100kPa, and the above solution was heated to 80° C. under stirring and kept for 4 hours to obtain a colorless...

Embodiment 2

[0038] (1) Carry out polymerization reaction according to the method for embodiment 1 step (1).

[0039] (2) Prepare liquid polyisoprene rubber according to the method of step (2) of Example 1, the difference is that 0.08mL of deionized water is first added, and then passed into the solution after the polymerization reaction at a flow rate of 10mL / min Carbon dioxide (purity greater than 99.9% by weight) for 5.5 minutes and continued stirring for 10 minutes. After drying, a colorless and transparent liquid polyisoprene rubber was obtained, and the content of the 1,4-structure in the liquid polyisoprene rubber was determined to be 94.5%. Take an appropriate amount of the above-mentioned liquid polyisoprene rubber and place it in an oven at 80° C. for 4 hours, and the appearance of the liquid polyisoprene rubber is still colorless and transparent.

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Abstract

The invention provides a liquid rubber and a preparation method thereof. The method comprises: (1) polymerizing alkene under an anionic polymerisation condition and in the presence of an organolithium compound and a nonpolar organic solvent, with a mole ratio of the organolithium compound and the alkene being 1 : 70-1850; and (2) simultaneously or sequentially contacting the polymerized solution in the step (1) with water and / or C1-C6 alcohol and a gas containing 10-100 % by volume of carbon dioxide, and dying by heating or under vacuum the contacted products in the presence of an antioxidant with stirring, wherein relative to 1 mole of the organic lithium compound in the step (1), an amount of the water and / or the C1-C6 alcohol is 0.5-1.5 moles, and an amount of the carbon dioxide is 0.5-2 moles. According to the preparation method of the liquid rubber, the obtained liquid rubber has colorless and transparent appearance which has no obvious changes after aging at a certain temperature.

Description

technical field [0001] The invention relates to a liquid rubber and a preparation method thereof. Background technique [0002] Liquid rubber is a viscous flowable liquid with an index average molecular weight of less than 100,000. Its main advantages are: easy to operate, can be processed by casting or injection, simple equipment, and convenient construction; it can produce rubber shoes, industrial products to tires Various rubber products; the best processing aids in the rubber industry, such as plasticizers, softeners, co-vulcanizing agents, modifiers, etc.; plasticizers in the plastics industry; potting agents and coating agents in the electronics industry ; and asphalt modifiers. In addition, liquid rubber can also be widely used to make various coatings such as anti-corrosion coatings, low-temperature coatings, electrical insulation coatings, water-soluble coatings and electrophoretic coatings, etc., which have the advantages of toughness and impact resistance. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/00C08K5/13C08K5/526C08C2/02C08F36/06C08F36/08C08F4/48
Inventor 贺小进解希铭王世朝李传清康新贺王妮妮刘辉石建文李延良
Owner CHINA PETROLEUM & CHEM CORP
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