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A kind of amphiphilic polycarboxylate cement dispersant and preparation method thereof

A technology of cement dispersant and polycarboxylate, which is applied in the field of amphiphilic polycarboxylate cement dispersant and its preparation, to achieve the effects of improving compressive strength, strong slump retention, and high water-reducing rate

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

[0011] In order to solve the problem that the existing polycarboxylate cement dispersant has no help in improving the mechanical properties of concrete, the present invention combines the advantages of polycarboxylate cement dispersant and nanomaterials to provide an amphiphilic polycarboxylate cement dispersant An agent and a preparation method thereof, the amphiphilic polycarboxylate cement dispersant not only has the advantages of excellent water reduction, slump retention, and adjustable structure of polycarboxylate, but also has the function of nanomaterials to improve the mechanical properties of concrete, such as flexural resistance strength, compressive strength and impermeability; the products described in this invention will definitely have a profound impact on the technical field of building materials

Method used

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  • A kind of amphiphilic polycarboxylate cement dispersant and preparation method thereof
  • A kind of amphiphilic polycarboxylate cement dispersant and preparation method thereof
  • A kind of amphiphilic polycarboxylate cement dispersant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add 9.33g of RAFT reagent EMP, 30g of acrylic acid, 2.26g of V-50 initiator (the molar ratio of raw materials is 5:50:1) and 27.7g of water into the flask equipped with a stirrer, and mix well. At this time, the polymerization concentration is 60 % in N 2 Under the atmosphere, the temperature was raised to 60°C, and after 1 hour of reaction, the polymer A-1 solution containing RAFT functional ends was obtained, and the monomer conversion rate was 99.2% as measured by HPLC;

[0057] In the flask that stirrer is housed, add RAFT reagent EMP4.03g, polyethylene glycol monomethyl ether methacrylate macromonomer (M w =600) 180g, V-501 initiator 1.67g (the molar ratio of the raw materials is 3:50:1) and fully mixed. At this time, the polymerization concentration is 100%. 2 Under the atmosphere, the temperature was raised to 60°C, and after 3 hours of reaction, the polymer B-1 containing RAFT functional terminal was obtained, and the monomer conversion rate was 98.6% as measur...

Embodiment 2

[0060] Add 6.11g of RAFT reagent CETPA, 20g of acrylic acid + 5.97g of methacrylic acid, 1.25g of V-50 initiator (the molar ratio of raw materials is 5:60+15:1) and 33.4g of water into the flask equipped with a stirrer, and mix well , when the polymerization concentration is 50%, at N 2 Under the atmosphere, the temperature was raised to 70°C, and after 1 hour of reaction, the polymer A-2 solution containing RAFT functional ends was obtained, and the monomer conversion rate was 98.9% as measured by HPLC;

[0061] In the flask that stirrer is housed, add RAFT reagent BDMAT3.38g, polyethylene glycol monomethyl ether methacrylate macromonomer (M w =1000) 180g, 1.29g of VA-044 initiator (the molar ratio of raw materials is 3:45:1) and 46.2g of water are fully mixed. At this time, the polymerization concentration is 80%. 2 Under the atmosphere, the temperature was raised to 70°C, and after 2 hours of reaction, the polymer B-2 solution containing RAFT functional ends was obtained, ...

Embodiment 3

[0064] Add 4.61g of RAFT reagent BDMAT, 23.5g of acrylic acid + 8.01g of maleic anhydride, 1.06g of VA-044 initiator (the molar ratio of raw materials is 5:100+25:1) and 37.2g of water to the flask equipped with a stirrer. Mixing, at this time the polymerization concentration is 50%, in N 2 Under the atmosphere, the temperature was raised to 70°C, and after 2 hours of reaction, the polymer A-3 solution containing RAFT functional ends was obtained, and the monomer conversion rate was 98.7% as measured by HPLC;

[0065] In the flask that stirrer is housed, add RAFT reagent CETPA4.22g, polyethylene glycol monomethyl ether methacrylate macromonomer (M w =1200) 240g, ammonium persulfate initiator 1.21g (the molar ratio of raw materials is 3:37.5:1) and water 163g are fully mixed, and the polymerization concentration is 60% at this moment, in N 2 Under the atmosphere, the temperature was raised to 70°C, and after 2 hours of reaction, the polymer B-3 solution containing RAFT functio...

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Abstract

The present invention provides an amphiphilic polycarboxylic acid cement dispersant and a preparation method thereof. The amphiphilic polycarboxylic acid cement dispersant is a polycarboxylic acid particle dispersion liquid with wormlike micromorphology; the amphiphilic polycarboxylic acid cement dispersant comprises amphiphilic polycarboxylic acid nanoparticles and water; the weight-average molecular weight of the amphiphilic polycarboxylic acid nano particles is 15000-40000; the amphiphilic polycarboxylic acid cement dispersant has the advantages of excellent water reducing property, slump loss resistance, adjustable structure and the like of a polycarboxylic acid, and also has the functions of improvement of concrete mechanical properties such as flexural strength, compressive strength and impermeability of a nano material.

Description

technical field [0001] The invention belongs to the technical field of admixtures for cement concrete, and in particular relates to an amphiphilic polycarboxylate cement dispersant and a preparation method thereof. Background technique [0002] Polycarboxylate cement dispersant 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. [0003] Polycarboxylic acid is a comb-shaped polymer, its main chain is rich in carboxylic acid groups, and its side chain is polyoxyalkylene group. When it is added to cement paste, the main chain can be directional adsorbed on the surface of cement particles. The electrostatic repulsion of the main chain and the steric repulsion of the hydration adsorption layer formed by the side chain play a role in dispersion. However, the main effect of polycarboxylic acid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F212/08C08F220/18C08F220/14C08F120/06C08F120/28C08F220/06C08F222/06C08F222/02C08F2/10C08F2/22C04B24/26C04B103/40
CPCC04B24/2647C04B24/2676C04B24/2688C04B24/2694C04B2103/408C08F2/10C08F2/22C08F120/06C08F120/28C08F212/08C08F220/06C08F220/14C08F220/18C08F220/1803C08F220/1804C08F293/005C08F2438/03C08F222/06C08F222/02
Inventor 李申桐冉千平舒鑫杨勇赵红霞曹攀攀严涵
Owner JIANGSU SOBUTE NEW MATERIALS
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