A kind of nano polycarboxylate water reducer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of nano-polycarboxylate water reducing agent and its preparation, can solve the problems of insignificant anti-sludge effect, low water-reducing performance, cumbersome steps, etc., and achieve excellent anti-sludge performance , High water reduction rate, not easy to agglomerate and precipitate

Active Publication Date: 2019-04-30
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the products reported in these patents do not have high water-reducing performance, and the anti-mud effect is not significant, and the steps are cumbersome, polluting, and costly

Method used

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  • A kind of nano polycarboxylate water reducer and preparation method thereof
  • A kind of nano polycarboxylate water reducer and preparation method thereof
  • A kind of nano polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In the flask that stirrer is housed, add small molecule RAFT reagent EMP5.04g, polyethylene glycol monomethyl ether methacrylate macromonomer (M w =500) 150g, acrylic acid 25.9g+itaconic acid 31.2g, sodium methallylsulfonate 11.85g, V-50 initiator 2.03g (the molar ratio of raw materials is 3:40:48+32::1) and 151g of water is fully mixed, and the polymerization concentration is 60% at this time, and the 2 Under the atmosphere, the temperature was raised to 60 ° C, and after 2 hours of reaction, the macromolecular RAFT reagent aqueous solution MR01 was obtained, the monomer conversion rate was 98.5%, and the molecular weight was M w for 10800.

[0050] Add 648g of hydrophobic monomer propyl methacrylate and 1153g of water to MR01, stir at a speed of 1000rpm for 30min to form a stable emulsion, then add 10g of aqueous solution containing 1.02g of V-50 initiator, at this time MR01, hydrophobic monomer and initiator The molar ratio of the agent is 6:1350:1, the polymerizat...

Embodiment 2

[0052] In the flask that stirrer is housed, add small molecule RAFT reagent BDMAT4.03g, polyethylene glycol monomethyl ether methacrylate macromonomer (M w =800) 160g, acrylic acid 42.2g+fumaric acid 17g, sodium styrene sulfonate 13.7g, V-501 initiator 1.32g (raw material molar ratio is 3:45:132+33:14:1) and water 225g fully Mixing, at this time the polymerization concentration is 50%, in N 2 Under the atmosphere, the temperature was raised to 70 ° C, and after 3 hours of reaction, the macromolecular RAFT reagent aqueous solution MR02 was obtained, the monomer conversion rate was 99.0%, and the molecular weight was M w is 15300;

[0053] Add 370g of hydrophobic monomer styrene and 1550g of water in MR02, after stirring at a speed of 1000rpm for 30min to form a stable emulsion, then add 10g of aqueous solution containing 1.15g of VA-044 initiator. At this time, the moles of MR02, hydrophobic monomer and initiator The ratio is 4:1000:1, the polymerization concentration is 25%,...

Embodiment 3

[0055] In the flask that stirrer is housed, add small molecule RAFT reagent BDMAT3.53g, polyethylene glycol monomethyl ether methacrylate macromonomer (M w =1000) 200g, acrylic acid 36g, 2-acrylamide-2-sodium methylpropanesulfonate 10.4g, potassium persulfate initiator 0.844g (the molar ratio of raw materials is 4:64:160:16:1) and water 376g Mix well, at this time the polymerization concentration is 40%, in N 2 Under the atmosphere, the temperature was raised to 80°C, and after 4 hours of reaction, the macromolecular RAFT reagent aqueous solution MR03 was obtained, the monomer conversion rate was 99.3%, and the molecular weight was M w is 19400;

[0056] Add hydrophobic monomer tert-butyl methacrylate 356g and water 1030g in MR03, after stirring 30min under the speed of 1000rpm to form stable emulsion, then add the aqueous solution 10g that contains 0.845g potassium persulfate initiator, now MR03, hydrophobic monomer and The molar ratio of the initiator is 4:800:1, the polym...

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Abstract

The invention provides a preparation method of polycarboxylic acid nanoparticles. The polycarboxylic acid nanoparticles are formed through copolymerizing a hydrophilic monomer unsaturated acid, a hydrophilic monomer polyethylene glycol monomethyl ether methacrylate, a hydrophilic monomer unsaturated sulfonate and a hydrophobic monomer styrene or (meth)acrylate, and have a linear microstructure in water. The water reducer applied to concrete has the advantages of low proportion, high water reduction, long slump retaining time and excellent mud resistance; and the polycarboxylic acids particles solves the water reducing and slump retaining problems of concrete without a super water reducer or an extra sacrificing agent when the mud content of aggregates is high, so the water reducer has good economic benefit.

Description

technical field [0001] The invention relates to the technical field of admixtures for cement concrete, in particular to a nano polycarboxylate water-reducer which has an anti-mud effect and can be used as a concrete water-reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has become the most important product in the current concrete admixture market due to its advantages such as low dosage, high water reducing rate, good slump retention, strong molecular structure adjustability, and environmental protection. Polycarboxylate superplasticizer is a comb-shaped water-soluble polymer, which is composed of a main chain rich in carboxylic acid groups and a polyoxyalkylene side chain. The carboxylic acid groups on the polycarboxylic acid main chain can be directional adsorbed on the surface of positively charged cement or cement hydrate, while the polyoxyalkylene side chains stretch in the solution to form a hydration layer to pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F293/005C08F2438/01
Inventor 冉千平李申桐杨勇刘金芝张茜翟树英王秀梅
Owner JIANGSU SOBUTE NEW MATERIALS
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