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Synthesis of liquid end hydroxy styrene-butadiene rubber

A hydroxy-terminated styrene-butadiene and liquid rubber technology, applied in the field of free radical polymerization, can solve the problems of low styrene content, severe reaction, difficult control, etc., and achieve the effects of less residual monomers, good color and low cost of raw materials

Inactive Publication Date: 2004-01-21
BC P INC CHINA NAT PETROLEUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. The reaction in the polymerization process with high concentration one-time feeding is violent, difficult to control, and the content of bound styrene is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 20% butadiene, styrene (butadiene / styrene is 75 / 25) 2.8Kg of monomer total amount in 50L stainless steel pressure-resistant polymerization kettle, industrial ethanol 2.635Kg, hydrogen peroxide (50%) 0.28Kg, ethanolamine 0.14Kg, dodecyl mercaptan 0.112Kg, start the reaction polymerization tank to stir, when the temperature rises to 125°C, turn on the high-precision metering pumps for butadiene, styrene and organic peroxide to reduce the remaining 80% The monomer, initiator, and solvent were divided into three parts on average, and the addition was completed within the first hour, the second hour, and the third hour respectively. After the addition was completed, the reaction was continued for 1 hour to end. Add 0.65Kg of the terminator sodium methylenediphthalene disulfonate to the crude polymer glue, and continue to stir and react. After the reaction is completed, wash with water and let it stand. After entering the desiccator for drying, add anti-aging agent and ant...

Embodiment 2

[0017] Add 20% butadiene, styrene (butadiene / styrene is 75 / 25) 2.8Kg of monomer total amount in 50L stainless steel pressure-resistant polymerization kettle, industrial ethanol 2.635Kg, hydrogen peroxide (50%) 0.28Kg, dodecyl mercaptan 0.112Kg, start the reaction polymerization tank to stir, when the temperature rises to 125°C, add the remaining 80% butadiene, styrene and initiator to the reaction tank continuously within 4 hours In the process, the addition was completed, and the reaction was continued for 1 hour until the end of the polymerization reaction. Process operation and aftertreatment method are with embodiment 1. The main physical properties of the polymer are: number average molecular weight 2626, hydroxyl value 0.756mmol / g, viscosity 15.6Pa.s, benzene knot 22.65%, dispersion index 2.89, average functionality 1.99.

Embodiment 3

[0019] Add 25% (butadiene / styrene is 75 / 25) 3.50Kg of total monomer in 50L stainless steel pressure-resistant polymerization kettle, industrial acetone 3.15Kg, hydrogen peroxide (23%) 0.76Kg, triethanolamine 0.018Kg , N-mercaptan 0.16Kg. Start the reaction polymerization tank to stir, heat up to 128°C, and the remaining 75% monomer, initiator, and solvent are fed in the same manner as in Example 1. After the addition was complete, the reaction was continued for 1 hour to end. The reaction was continued for 1 hour until the end of the polymerization reaction. Add 0.65Kg of terminator sodium methylenediphthalene disulfonate to the crude polymer glue, react at 100°C for half an hour, then wash with water, let it stand, and send it to a desiccator for drying, add anti-aging agent, anti-oxidant Additives such as additives are filtered through a filter to obtain a hydroxyl-terminated polybutadiene-styrene liquid polymer. Its main physical property indicators are: number average m...

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Abstract

The present invention relates to the synthesis of end hydroxy styrene-butadiene liquid rubber, and is especially the free radical polymerization of butadiene monomer and styrene monomer inside organic ketone or C1-C6 organic alcohol solvent in the presence of organic peroxide as initiator. The present invention features the polymerization mode with batchwise added material. The end hydroxy styrene-butadiene liquid rubber of the present invention has high molecular weight, narrow molecular weight distributing range, functionality near 2, copolymerized chain segment of butadiene and styrene in the multi-molecular chain, and excellent comprehensive product performance. The product may be used in solid tyre, polyurethane adhesive, solid rubber plasticizer, elastic polyurethane material, and other fields.

Description

technical field [0001] The invention relates to a synthetic method of hydroxy-terminated styrene-butadiene liquid rubber, that is, a synthetic method of hydroxy-terminated styrene-butadiene liquid rubber, in particular to a compound that uses butadiene and styrene as monomers, organic peroxides as initiators, and 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 copolymerized liquid polymer belongs to functionalized high molecular polymer. Since the product came out, it has developed rapidly abroad. It has been used in pouring solid tires, tire retreading, polyurethane adhesives, polyurethane electrical potting adhesives, solid rubber plasticizers, polyurethane elastomer materials, sealants, coatings, pouring and sealing bags, Thermoplastic resin modification, epoxy resin plastic modification, anti-corrosion and wear-resistan...

Claims

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Application Information

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IPC IPC(8): C08F2/06C08F236/10
Inventor 齐永新赵小龙郝爱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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