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Emulsion polymerization method for preparing tractable butadiene styrene rubber

A technology of emulsion polymerization and styrene-butadiene rubber, which is applied in the field of emulsion polymerization to prepare styrene-butadiene rubber. It can solve the problems of affecting vulcanization strength, molecular chain breakage, product surface cracking, etc., and achieves good physical and mechanical properties and improved Mooney viscosity. , The effect of improving the tensile strength

Active Publication Date: 2013-12-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the gel will affect the vulcanization strength during the rubber processing process, it is easy to affect the uniformity of the molecular structure of the rubber product. During the stress deformation process, the molecular chain group will be unevenly stressed, resulting in the breakage of the molecular chain and cracks on the surface of the product. Seriously affect the quality and service life of the product

Method used

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  • Emulsion polymerization method for preparing tractable butadiene styrene rubber
  • Emulsion polymerization method for preparing tractable butadiene styrene rubber
  • Emulsion polymerization method for preparing tractable butadiene styrene rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Add 5100 ml of water to a 10-liter reactor, then add 333.09 grams of CP-10 and 8.5 grams of CP-50, disperse and dissolve under stirring, add 380 grams of styrene, 4.1 grams of tertiary dodecyl mercaptan, and sodium dithionite 0.1692g, after nitrogen inflation-vacuum replacement, add cumene peroxide 0.4726g, then add butadiene 1243g, control the temperature to 12°C for reaction, when the conversion rate reaches 30-36%, add emulsifier CP-10105g , 0.55 grams of tertiary dodecyl mercaptan, 30.6 grams of aliphatic ether polysulfide and 87 grams of styrene and continue to react. When the conversion rate reaches 50 ± 3%, add 105 grams of emulsifier CP-10, 0.45 grams of tertiary dodecyl mercaptan Continue the reaction after 1 gram, add 32 grams of terminator after the reaction conversion reaches more than 75%, degas after 30 minutes, then condense, dry, and the results after the glue sample detection are shown in Table 1:

[0061] Table 1

[0062]

Embodiment 2

[0064] at 3M 3 Add 1600 kilograms of water to the reaction kettle, then add 56.75 kilograms of potassium stearate solution and 53.89 kilograms of potassium oleate solution, 20 kilograms of potassium chloride solution, and 14.28 kilograms of diffusing agent N solution, and disperse and dissolve under stirring. 2.6 kilograms of mercaptans, add 200 kilograms of styrene, 46 kilograms of ammonium persulfate solution, 576 kilograms of butadiene, and control the temperature to 8 ° C for reaction. When the conversion rate reaches 30-36%, add 10.5 grams of emulsifier potassium stearate solution , 7.5 kilograms of potassium oleate solution, 16 kilograms of aliphatic ether polysulfides and 54 kilograms of styrene continue to react, and when the conversion rate reaches 50 ± 3%, add 10.5 kilograms of emulsifier potassium stearate solution and 7.5 kilograms of potassium oleate solution Continue to react after 1 kg, add 48 kg of terminator when the reaction conversion rate reaches more than ...

Embodiment 3

[0068] Add 4449 ml of water into a 10-liter reactor, then add 98.56 g of CP-103 and 15.37 g of CP-50, disperse and dissolve under stirring, add 400.59 g of styrene, 4.1 g of tert-dodecyl mercaptan, and 0.17 g of sodium dithionite gram, nitrogen inflation-after vacuum replacement, add 0.856 grams of dicumyl peroxide, then add 1440 grams of butadiene, control the temperature to 5±0.5°C for reaction, when the conversion rate reaches 30-36%, add emulsifier CP- 10 75 grams, 0.65 grams of tertiary dodecyl mercaptan, 31.5 grams of aliphatic ether polysulfides and 54 grams of styrene, and then continue the reaction. When the conversion rate reaches 50±3%, add emulsifier CP-10 75 grams, tertiary ten Continue to react after 0.35 grams of dicarbon mercaptan, add 35 grams of terminators when the reaction conversion rate reaches more than 80 ± 2%, degas after 30 minutes, then condense, dry, and the results after the glue sample detection are shown in Table 3:

[0069] table 3

[0070] ...

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Abstract

The invention relates to an emulsion polymerization method for preparing a tractable butadiene styrene rubber. The polymerization method comprises at least the following steps: adding part of styrene (an oil phase) and part of an emulsifier (an aqueous phase), a regulator and an initiator into a polymerization kettle; adding butadiene; carrying out emulsion polymerization with stirring; and when conversion rate of the polymerization reaction in the middle stage reaches 30-60%, refilling the emulsifier, the crosslinking agent, styrene and the regulator by one or more times. The styrene butadiene rubber prepared by the method provided by the invention has high micro gel content and low gel content; coupled with the electron cloud effect of the pi bonds in the benzene ring of the molecular chain, a three-dimensional net shape structure is easy to form in the processing process; and the rubber product has good physical and mechanical properties, increased Mooney viscosity, and correspondingly increased tensile strength and 300% stretching strength.

Description

technical field [0001] The invention relates to a method for preparing styrene-butadiene rubber by emulsion polymerization, more precisely, a method for producing styrene-butadiene rubber raw materials with high microgel content and easy processing by emulsion polymerization. Background technique [0002] At present, there are many methods for preparing styrene-butadiene rubber by emulsion method, such as continuous polymerization method and batch polymerization method. [0003] During the polymerization process of rubber production, insoluble substances in good rubber solvents will be generated due to the increase of rubber molecular branching and chemical crosslinking between molecules. It is a macromolecule formed by the increase of branching of a single linear molecule or a three-dimensional network-shaped macromolecular group formed by the interaction between linear molecules, which is called a gel. [0004] Microgels refer to molecules with micro-branched structures, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/10C08F2/24C08F2/38
Inventor 张元寿张茵钟启林季江东赵洪国郑红兵李晶王真琴翟云芳徐典宏董万卓康安福
Owner PETROCHINA CO LTD
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