Synthesis of liquid end hydroxy polybutadiene-styrene rubber

A hydroxyl-terminated polybutadiene and liquid rubber technology, applied in the field of free radical polymerization, can solve the problems of turbidity and opacity of the polymer, increase in viscosity, and high peroxide content in the liquid polymer, and achieve narrow molecular weight distribution, high molecular weight, good transparency

Inactive Publication Date: 2005-05-04
BC P INC CHINA NAT PETROLEUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2. The peroxide content of liquid polymers without terminator treatment is high, and there is a problem of viscosity increase during storage
[0005] 3. The polymer is cloudy and opaque

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add monomer (butadiene / styrene is 85 / 15) 14.5Kg, industrial ethanol 12.9Kg, dicumyl hydroperoxide-hydrogen peroxide 3.0Kg, dodecyl sulfide in 50L stainless steel pressure-resistant polymerization kettle Alcohol 0.25Kg, start the reaction polymerization tank to stir, when the temperature rises to 128°C reaction temperature, maintain the reaction at the reaction temperature for 4 hours until the polymerization reaction ends. Add 0.65Kg of hydroquinone to the crude polymer glue, continue to stir and react. After the reaction is completed, wash with water and let it stand for 24 hours. After drying in a desiccator, add 0.032kg of 2246 anti-aging agent, and filter through a filter to obtain Hydroxyl-terminated polybutadiene-styrene liquid polymer. Its main physical properties are: number average molecular weight 2843, hydroxyl value 0.706mmol / g, viscosity 12.2Pa.s, bound styrene 15.4%, dispersion index 1.95, average functionality 2.1, no peroxide detected.

Embodiment 2

[0020] Add 25% (butadiene / styrene is 75 / 25) 4.04Kg of total amount monomer in 50L stainless steel pressure-resistant polymerizer, industrial acetone 5.0Kg, hydrogen peroxide p-menthane-hydrogen peroxide 3.0Kg, B Amide 0.03Kg, n-mercaptan 0.25Kg, start the reaction polymerization tank to stir, heat up to 125°C, start feeding once after 1 hour of reaction, add butadiene / styrene (75 / 25) 7.272Kg, industrial acetone-hydrogen peroxide P-menthane-hydrogen peroxide solution 5.3Kg, continue to react for 1 hour and then feed twice, add butadiene / styrene (75 / 25) 4.848Kg, industrial acetone-hydrogen peroxide p-menthane-hydrogen peroxide 1.5Kg . The reaction was continued for 2 hours until the end of the polymerization reaction. Add 0.65Kg of sodium methylene dinaphthalenesulfonate to the crude polymer glue, continue to stir and react for 1 hour until the end of the reaction, wash with water and let stand, dry in a desiccator, add 0.032kg of 2246 anti-aging agent, pass through the filter ...

Embodiment 3

[0022] Add 14.1Kg of monomer (butadiene / styrene is 85 / 15), 11.5Kg of industrial ethanol, 2.1Kg of 30% hydrogen peroxide, and 0.17Kg of dodecyl mercaptan into a 50L stainless steel pressure-resistant polymerization kettle to start the reaction The polymerization tank was stirred, and when the temperature was raised to a reaction temperature of 120° C., the reaction was maintained at the reaction temperature for 4 hours until the polymerization reaction was completed. Add 0.65Kg of p-tert-butylcatechol to the crude polymer glue, and continue to stir and react. After the reaction is completed, wash with water and let it stand for 24 hours. After drying in a desiccator, add 0.026kg of 2246 anti-aging agent and filter through a filter. That is, the hydroxyl-terminated polybutadiene-styrene liquid polymer is obtained. Its main physical properties are: number average molecular weight 3177, hydroxyl value 0.623mmol / g, viscosity 11.6Pa.s, bound styrene 15.12%, dispersion index 1.8, ave...

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Abstract

The present invention relates to a kind of synthetic method of hydroxyl-terminated styrene-butadiene liquid rubber, especially a kind of with butadiene, styrene as monomer, organic peroxide as initiator, organic ketone, C1-C6 organic alcohol as solvent, The radical polymerization method performed is characterized in that a reaction terminator is used after the reaction. The hydroxyl-terminated polybutadiene-styrene liquid rubber prepared by the present invention has a high molecular weight, a narrow molecular weight distribution, a functionality close to 2, a copolymerized segment of butadiene and styrene in the multi-molecular chain, and excellent comprehensive performance of the product; Low residual monomer content, low odor, good transparency and so on. Can be applied to pouring solid tires, tire retreading, polyurethane adhesives, polyurethane electrical potting adhesives, solid rubber plasticizers, polyurethane elastomer materials, sealants, epoxy resin toughening modification, anti-corrosion wear-resistant materials, photosensitive polymer materials and other fields.

Description

technical field [0001] The invention relates to a synthetic method of hydroxyl-terminated polybutadiene-styrene liquid rubber, that is, hydroxyl-terminated styrene-butadiene liquid rubber, in particular to a method using butadiene and styrene as monomers and organic peroxide as initiator , organic ketones, C 1 -C 6 The organic alcohol is used as a solvent, and the free radical polymerization method is carried out. Background technique [0002] Hydroxyl-terminated polybutadiene-styrene liquid rubber is a functional polymer. The polymer can be applied to pouring solid tires, tire retreading, polyurethane adhesives, polyurethane electrical potting adhesives, solid rubber plasticizers, polyurethane elastomer materials, sealants, epoxy resin toughening modification, anti-corrosion and wear-resistant materials, photosensitive Applications in polymer materials and other fields. The synthesis techniques of hydroxy-terminated styrene-butadiene liquid rubber mainly include anionic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/06C08F4/32C08F236/10
Inventor 齐永新郝爱赵小龙潘广勤张凤英李景云于晶胡少坤杜海
Owner BC P INC CHINA NAT PETROLEUM CORP
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