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Synthesis method of high conversion food grade styrene butadiene rubber

A technology of styrene-butadiene rubber and synthesis method, which is applied in the field of polymer elastomer synthesis, can solve problems such as patents or other technical materials that have not yet been seen, and achieve controllable gel content, shorten degassing time, and save energy consumption Effect

Inactive Publication Date: 2005-03-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, Shell is also producing this product, but we have not seen their patents or other technical materials

Method used

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  • Synthesis method of high conversion food grade styrene butadiene rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: In a 10-liter polymerizer with stirring, nitrogen inlet and outlet, material inlet and outlet, temperature and pressure measurement ports and jacket, 2000 ml of deionized water and deionized water containing 115 g of fatty acid soap and 6 g of potassium chloride were added. Add 2500ml of aqueous solution, add 1750ml of styrene, 9ml of dodecanethiol, and 500ml of an aqueous solution of 13.5g of potassium persulfate, start the vacuum pump, evacuate for 30 minutes, then add 1250g of butadiene, and send hot water to the jacket of the polymerizer to increase the temperature. For polymerization, keep the polymerization temperature at 50-65°C. When the conversion rate is more than 45%, add 500g of butadiene and 9ml of dodecyl mercaptan to the gathering kettle continuously or in 3-5 times. When the conversion rate is more than 90% , To terminate.

[0025] After flash degassing and vacuum degassing of the polymer emulsion, the unreacted butadiene has been completely remov...

Embodiment 2

[0026] Example 2: In the above polymerization reactor, 2500ml of deionized water solution containing 2000ml of deionized water, 135g of fatty acid soap and 7.5g of potassium phosphate were added, and an aqueous solution of 950ml of styrene, 9ml of dodecyl mercaptan and 15.0g of potassium persulfate were added. 500ml, start the vacuum pump, evacuate for 30 minutes, then add 1700g butadiene, feed hot water into the jacket of the polymerization kettle, raise the temperature for polymerization, keep the polymerization temperature at 50-55℃, when the conversion rate is ≥55%, transfer to the party kettle Add 450 g of butadiene, 12 ml of dodecyl mercaptan, and 7.5 g of mercaptopropionic acid continuously or in 2-6 times, and stop when the conversion rate is ≥90%.

[0027] After flash degassing and vacuum degassing of the polymer emulsion, the unreacted butadiene has been completely removed. When the residual styrene content is less than 65ppm, add 35ml of dicumyl hydrogen peroxide and re...

Embodiment 3

[0029] Example 3: According to the method and feeding amount of Example 2, only butadiene and regulator are added at one time for polymerization, and when the conversion rate is ≥90%, it is terminated. After flash degassing and vacuum degassing of the polymer emulsion, the unreacted butadiene has been completely removed. Add 45ml of cumene hydroperoxide and react at 50-60°C for four hours under stirring, then coagulate and dry. Mooney viscosity (ML 100 1+4 ) 85, the gel content is 51%, and the residual styrene content is less than 25 ppm. This product cannot be processed into chewing gum and bubble gum.

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Abstract

A process for preparing food-class butadiene-styrene rubber with high conversion rate 85-98% includes such steps as high-temp emulsion polymerizing between conjugated diolefin and styrene, and as well as water-soluble peroxide as trigger and food-class surfactant as emulsifier, vacuum degassing, coagulating, and drying.

Description

Technical field [0001] The invention relates to a method for synthesizing a polymer elastomer, in particular to a method for synthesizing high-temperature polymerization and high conversion food-grade styrene-butadiene rubber. Background technique [0002] In the mid-1960s, Goodyear Tire & Rubber Co. of the United States took the lead in producing food-grade styrene-butadiene rubber, which was divided into the following brands according to the difference of the combined styrene and the antioxidants used: [0003] Plioflex Grade Mooney Viscosity %Bood Styrene Stabilizer 1027 47 to 57 22 to 25 BHT 6642A 47 to 57 22 to 25 BHA 1028 52 to 64 45 to 50 BHT 6648A 52 to 64 45 to 50 BHA [0004] In addition, Shell is also producing this product, but we have not yet seen their patents or other technical information. [0005] In the US patent US 6 235 319 (2001.5.22), S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/24C08F236/10
Inventor 薛心涛李成贵扬蜀黔樊祥峰任彩霞李亮扬瑞祥张晓东吴绍荣吕峰赵以美孙明俭
Owner BC P INC CHINA NAT PETROLEUM CORP
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