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Method for synthesizing carboxyl butadiene-styrene latex improving concrete tensile strength

A technology of carboxylated styrene-butadiene latex and synthesis method, which is applied in the field of synthesis of carboxylated styrene-butadiene latex, can solve the problems of high price and unfavorable popularization and application, and achieve the effects of low price, improved water resistance and weather resistance, and reduced pollution

Active Publication Date: 2008-03-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The monomers and additives used in the above technologies are various and expensive, which is not conducive to the promotion and application in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Latex production

[0019] 1) Feeding process: in a 10L polymerization kettle with stirring, nitrogen inlet and outlet, material inlet and outlet, temperature and pressure measuring port and jacket (the polymerization kettle is first evacuated, and then replaced with nitrogen, when the vacuum reaches -0.10MPa) Drop into 63 parts of soft water by mass successively, emulsifier solution (10 parts of soft water, 0.8 part of H-95, 0.6 part of nonyl polyoxyethylene ether TX-12, 0.2 part of β-naphthalene sulfonate sodium formaldehyde condensate parts), potassium phosphate, sodium bicarbonate, tetrasodium EDTA solution totaling 0.9 parts, potassium persulfate 1 part, styrene 22 parts, n-dodecyl mercaptan 0.2 parts, methacrylic acid 1 part, itaconic acid 1 part , 4 parts of n-butyl acrylate, 0.8 parts of acrylonitrile, 0.8 parts of N-methylol acrylamide, 14 parts of butadiene, 20 parts of styrene, then start to heat up, when the reaction temperature reaches 50 ℃, add initiato...

Embodiment 2

[0027] In a 10L polymerization kettle with stirring, nitrogen inlet and outlet, material inlet and outlet, temperature and pressure measurement port and jacket, add 2000 ml of deionized water and 2500 ml of deionized aqueous solution containing 65g of emulsifier and 9g of potassium phosphate, add styrene 1450ml, 80g of other functional monomers, 7.5ml of tert-dodecyl mercaptan, and 500ml of an aqueous solution containing 13.5g of potassium persulfate, start the vacuum pump, evacuate for 30 minutes, then add 900g of butadiene, and send heat to the jacket of the polymerization kettle. Water, heat up and polymerize, keep the polymerization reaction temperature at 55±1°C, when the conversion rate is greater than 45%, continuously add 500g each of styrene and butadiene, and 7.5ml of tert-dodecanethiol to the polymerization kettle, containing an emulsifier. 20g and 500ml of an aqueous solution of other additives, increase the reaction temperature to 65±1°C, and maintain the reaction....

Embodiment 3

[0030] In the above polymerization reactor, 2000ml of deionized water and 2500ml of deionized water containing 35g of alkyl sulfate, H-9533g, 21g of TX-15 and 7.5g of potassium phosphate were added, 1500ml of styrene, 70g of other functional monomers, tertiary 9ml of dodecyl mercaptan and 500ml of an aqueous solution containing 35.0g of potassium persulfate, start the vacuum pump, evacuate for 30 minutes, then add 550g of butadiene, send hot water to the jacket of the polymerization kettle, heat up and polymerize, and keep the polymerization temperature at 55± At 1°C, when the conversion is greater than 55% based on the total amount of monomers, continuously add 450g of butadiene, 500ml of styrene, 12ml of tert-dodecanethiol, and an aqueous solution containing 20g of emulsifier and other additives to the polymerization kettle 500ml, increase the reaction temperature to 65±1℃, and maintain the reaction. Termination was performed when the conversion was >97% based on total monom...

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Abstract

The present invention relates to a synthetic method for carboxylated styrene-butadiene latex with improved concrete bending and tensile strength through the preparation method of conjugated dienes - styrene copolymer. The preparation method involves 30 to 50 shares of butadiene or isoprene isoprene, 40 to 55 shares of styrene, 1 to 3 shares of acrylonitrile, 1 to 4 shares of N-hydroxymethylin acrylamide, 0.1 to 5 shares of methyl acrylate, 1 to 5 shares of itaconic acid, 4 to 12 shares of acrylic n-butyl, 1.0 to 2.0 shares of emulsifier, 0.4 to 1.0 shares of potassium persulphate, 0.1 to 0.8 shares of molecular weight regulator, 0.01 to 0.5 shares of pH buffer agent, 0.01 to 5 shares of potassium phosphate, 0.01 to 5 shares of chelator and 100 to 150 shares of soft water; In the polymerization reaction, monomer and a variety of agents are added with intermission. And reaction temperature control adopts the two-step laddered control. When the conversion rate reaches 99.0 percent, the mixture experiences the vacuum degassing treatment. The present invention has the advantages of low cost, strong bonding, easy mixing with the cement, convenient construction and fast film forming at room temperature. The present invention prolongs the service life of the road and reduces the brittle fracture surface of the road. Small amount of improved styrene-butadiene latex added to the road concrete can reduce the water content of the road surface, and strengthen and toughen the road.

Description

technical field [0001] The invention relates to a synthesis method for preparing a carboxylated styrene-butadiene latex which improves the flexural tensile strength of concrete by using a method for synthesizing a conjugated diene-styrene copolymer by thermal emulsion polymerization of styrene-butadiene latex. Background technique [0002] In the production of styrene-butadiene latex for concrete modification abroad, styrene and butadiene are the main monomers for polymerization, and monounsaturated carboxylic acid is the third functional monomer. The properties of the copolymers formed by different ratios of styrene and butadiene are different. Such as D623 latex for pavement concrete modification, the ratio of styrene to butadiene is 65:35; B1603 latex is used for cement-based waterproof materials, and the ratio of styrene to butadiene is 30:70. When the amount of bound styrene is higher than 60%, the latex cures slowly to form a film at room temperature and forms a hard ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F2/38C08F4/30C08F2/24C04B24/26C08F236/08C08F220/44C08F220/56
Inventor 俞燕龙潘广勤张耀亨郝爱孙莉樊爱兰
Owner BC P INC CHINA NAT PETROLEUM CORP
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