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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. Pollution, good compatibility

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

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Latex production

[0024] 1) Feeding process: inside a 10L polymerizer with stirring, nitrogen inlet and outlet, material inlet and outlet, temperature and pressure measurement ports and jacket (the polymerizer is first evacuated, and then replaced with nitrogen, when the vacuum reaches -0.10MPa) Add 63 parts by mass of soft water and emulsifier solution (including 10 parts of soft water, 0.4 parts of sodium lauryl sulfate, 0.4 parts of sodium lauryl succinate, and 0.6 of nonphenol based polyoxyethylene ether TX-12. Parts, β-naphthalenesulfonate sodium formaldehyde condensate is 0.2 parts), potassium phosphate, disodium hydrogen phosphate, sodium bicarbonate, sodium bicarbonate, tetrasodium EDTA solution total 0.9 parts, potassium persulfate 1 part, styrene 18 parts, n-twelve Alkyl mercaptan 0.2 parts, methacrylic acid 1 part, itaconic acid 1 part, n-butyl acrylate 4 parts, acrylonitrile 0.8 parts, N-methylol acrylamide 0.8 parts, butadiene 20 parts, then start to heat ...

Embodiment 2

[0033] Add 2000ml deionized water and 1500ml containing 55g emulsifier, 9g potassium phosphate, and 3g disodium hydrogen phosphate into a 10L polymerization vessel with stirring, nitrogen inlet and outlet, material inlet and outlet, temperature and pressure measurement port and jacket. Add 450ml of styrene, 70g of other functional monomers, 7.5ml of t-dodecyl mercaptan and 500ml of an aqueous solution containing 13.5g of potassium persulfate. Start the vacuum pump and evacuate for 30 minutes. Then, add 500g of butadiene to the polymerization Feed hot water into the jacket of the kettle, raise the temperature for polymerization, and keep the polymerization temperature at 55±1°C. When the conversion rate is more than 45%, continuously add 900g each of styrene and butadiene, and t-dodecyl mercaptan into the polymerization kettle. 7.5ml, 500ml of aqueous solution containing 20g of emulsifier and other additives, increase the reaction temperature to 65±1°C to maintain the reaction. Whe...

Embodiment 3

[0036] 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 500ml of styrene , 60g of other functional monomers, 9ml of tert-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, and send hot water to the jacket of the polymerizer to increase the temperature For polymerization, keep the polymerization temperature at 55±1℃. When the conversion is over 55% based on the total monomer, continuously add 950g butadiene, 1000ml styrene, 12ml t-dodecyl mercaptan, and emulsification. 20g of reagent and 500ml of aqueous solution of other auxiliaries, raise the reaction temperature to 65±1°C to maintain the reaction. When the conversion rate is >97% based on the total amount of monomer...

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PUM

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Abstract

This invention relates to a synthesis method for carboxylated styrene-butadiene latex used in the cement-based waterproof coating. The preparation method involves 30 to 50 shares of butadiene or isoprene isoprene, 30 to 55 shares of styrene, 0.1 to 5 shares of methyl acrylate , 1 to 5 shares of itaconic acid, 1 to 8 shares of n-butyl acrylate butyl acrylate, 1.2 to 2.8 hares of emulsifier, 0.3 to 1.2 hares of initiator potassium supersulphate, 0.2 to 0.8 shares of molecular weight regulator, 0.01 to 0.5 shares of pH buffer sodium bicarbonate, 0.01 to 5 shares of electrolyte, 0.01 or 5 shares of chelating agent ethylenediamine tetraacetic acid or endrate disodium and 100 to 150 shares of soft water for polymerization. The electrolyte is the combination of potassium phosphate and disodium hydrogen phosphate, with the ratio of 3 to 2: 1; 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 latex produced by the present invention is of good compatibility with the additives as the paint during the paint preparation. The prepared paint is of excellent fluidity, water retention and machinery stability under the high-cut condition. The improved mortar has the advantages of good permeability, high bond strength and so on.

Description

Technical field: [0001] The invention relates to a method for synthesizing carboxyl styrene-butadiene latex for cement-based waterproof coating. Background technique [0002] Cement concrete is the largest man-made building material in modern times. The application of concrete in my country has grown very rapidly. From 1950 to 2002, the output of cement increased at a rate of 15% each year. By 2002, the output of cement in my country reached approximately 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 output, the annual consumption of concrete can reach 6-7 million cubic meters, ranking first in the world. [0003] Ordinary concrete is essentially a non-uniform porous material. Under the corrosive action of carbon dioxide, water, chloride ions, sulfates and other substances, it will accelerate the destruction of concrete and greatly shorten the service life of concrete. For this reason...

Claims

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Application Information

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Patent Type & Authority Applications(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
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