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Method for synthesizing carboxyl butadiene-styrene latex used for cement group water-proofing material

A technology of carboxylated styrene-butadiene latex and waterproof material, used in antifouling/underwater coatings, paints containing biocides, coatings, etc. The amount of recovered monomers and the effect of good compatibility

Active Publication Date: 2009-08-12
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

If the styrene content is too high, although it can increase the compressive and tensile strength, it will reduce the adhesion and bending properties

Method used

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  • Method for synthesizing carboxyl butadiene-styrene latex used for cement group water-proofing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Latex production

[0024] 1) Feeding process: in a 10L polymerization kettle with stirring, nitrogen inlet and outlet, material inlet and outlet, temperature and pressure measurement port and jacket (the polymerization kettle is first evacuated, then replaced with nitrogen, when the vacuum degree reaches -0.10MPa) Drop into 63 parts of soft water by mass successively, emulsifier solution (wherein 10 parts of soft water, 0.4 part of sodium lauryl sulfate, 0.4 part of sodium lauryl succinate, 0.6 part of nonyl polyoxyethylene ether TX-12 0.2 parts of sodium β-naphthalenesulfonate formaldehyde condensate), 0.9 parts of potassium phosphate, disodium hydrogen phosphate, sodium bicarbonate, tetrasodium EDTA solution, 1 part of potassium persulfate, 18 parts of styrene, and 0.2 parts of alkyl mercaptan, 1 part of methacrylic acid, 1 part of itaconic acid, 4 parts of n-butyl acrylate, 0.8 parts of acrylonitrile, 0.8 parts of N-methylol acrylamide, 20 parts of butadiene, and...

Embodiment 2

[0035] Add 2000ml of deionized water and 1500ml of deionized water containing 55g of emulsifier, 9g of potassium phosphate, and 3g of disodium hydrogenphosphate Add 450ml of styrene, 70g of other functional monomers, 7.5ml of tert-dodecyl mercaptan and 500ml of aqueous solution containing 13.5g of potassium persulfate, start the vacuum pump, and evacuate for 30 minutes, then add 500g of butadiene to polymerize Feed hot water into the jacket of the kettle, heat up to polymerize, and keep the polymerization reaction temperature at 55±1°C. When the conversion rate is >45%, continuously add 900g of styrene, butadiene, and tert-dodecylmercaptan to the polymerization kettle. 7.5ml, 500ml of aqueous solution containing 20g of emulsifier and other additives, raise the reaction temperature to 65±1°C, and maintain the reaction. Termination was performed when the conversion was >97% based on total monomer.

[0036] After the polymer emulsion has undergone flash degassing and vacuum dega...

Embodiment 3

[0038] In the above polymerization reactor, add 2000ml of deionized water and 1400ml of deionized aqueous solution containing 35g of alkyl sulfate, 25g of alkyl succinate, 60g of TX-15, 10g of potassium phosphate, and 5g of disodium hydrogen phosphate, and add 500ml of styrene , 60g of other functional monomers, 9ml of tertiary dodecylmercaptan and 500ml of 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, and heat up Polymerization, keeping the polymerization reaction temperature at 55±1°C, when the conversion is >55% based on the total amount of monomers, continuously add 950g of butadiene, 1000ml of styrene, 12ml of tertiary dodecyl mercaptan to the polymerization kettle, containing emulsifying Add 20g of agent and 500ml of aqueous solution of other additives, increase the reaction temperature to 65±1°C, and maintain the reaction. T...

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Abstract

The invention relates to a method for synthesizing carboxylated styrene-butadiene latex for cement-based waterproof coatings, which comprises 30-50 parts of butadiene or isoprene, 30-55 parts of styrene, 0.1-5 parts of methacrylic acid, clothing Conic acid 1-5 parts, n-butyl acrylate 1-8 parts, emulsifier 1.2-2.8 parts, initiator 0.3-1.2 parts, molecular weight regulator 0.2-0.8 parts, pH value buffer 0.01-0.5 parts, electrolyte 0.01- 5 parts, 0.01-5 parts of chelating agent and 100-150 parts of soft water are polymerized. The polymerization reaction adopts batch-wise addition of monomers and various preparations, and the temperature is controlled in two steps. When the conversion rate reaches 99.0% , carry out vacuum degassing treatment, the latex has good compatibility with additives such as pigments, the prepared coating has excellent fluidity, water retention and mechanical stability under high shear conditions, and the modified mortar has good impermeability, Advantages of high bond strength.

Description

Technical field: [0001] The invention relates to a method for synthesizing carboxylated styrene-butadiene latex for cement-based waterproof coatings. Background technique [0002] Cement concrete is the largest man-made building material in contemporary times. The application of concrete in my country has grown very rapidly. From 1950 to 2002, cement production increased at a rate of 15% per year. By 2002, my country's cement production had reached about 7.0×10 8 tons (data source: National Bureau of Statistics), ranking first in the world, accounting for about 1 / 3 of the world's annual cement production, and the annual consumption of concrete can reach 6-7 million cubic meters, ranking first in the world. [0003] Ordinary concrete is essentially a heterogeneous porous substance. Under the erosion of carbon dioxide, water, chloride ions, sulfate and other substances, it will accelerate the destruction of concrete, resulting in a greatly shortened service life of concrete. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F236/08C08F4/30C08F2/38C09D5/16C09D125/10C04B41/48
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