Polycarboxylate superplasticizer containing phosphate groups and preparation method

A technology of water reducer and polycarboxylic acid, which is applied in the field of polycarboxylate water reducer and its preparation, and achieves the effects of simple preparation method, low energy consumption and good slump performance

Inactive Publication Date: 2016-12-14
ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention proposes a phosphoric acid group-containing polycarboxylate water reducer and its preparation method. The polycarboxylate water reducer has good sulfate ion resistance and mud resistance, and solves the problem of polycarboxylate water reducer. The Adaptability of Acid Water Reducer and Concrete Raw Materials

Method used

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  • Polycarboxylate superplasticizer containing phosphate groups and preparation method
  • Polycarboxylate superplasticizer containing phosphate groups and preparation method
  • Polycarboxylate superplasticizer containing phosphate groups and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 75 parts of allyl polyoxyethylene ether (HPEG-2400) into the four-neck flask, stir and dissolve 52.5 parts of water, and heat up to 20°C. After the allyl polyoxyethylene ether is completely dissolved, add 0.23 parts Sodium phosphate, stir to dissolve, then add 0.98 parts of sodium hypophosphite, keep warm for 10 minutes after the solid is completely dissolved, add 0.7 parts (mass concentration: 30%) of hydrogen peroxide, stir for 5 minutes, and drop the pre-configured feed solution at the same time A, material liquid B; wherein material liquid A is formed by mixing 10 parts of acrylic acid and 9.5 parts of water, and the dropping time is 3 hours, and material liquid B is formed by mixing and dissolving 0.2 parts of L-ascorbic acid and 22.5 parts of water into, the dropping time is 3.5h. After the dropwise addition of the two materials is completed, the temperature is kept at the final temperature for 1 to 1.5 hours, and the pH is adjusted to 7±1 with 32% sodium hydr...

Embodiment 2

[0025] Add 75 parts of isopentenol polyoxyethylene ether (TPEG-2400) into the four-neck flask, stir and dissolve 52.5 parts of water, and heat up to 20°C. After the polyether is completely dissolved, add 0.23 parts of sodium phosphate, Stir to dissolve, then add 0.98 parts of sodium hypophosphite, after the solid dissolves completely, add 0.7 parts (mass concentration: 30%) of hydrogen peroxide, stir for 5 minutes, and drop the pre-configured feed liquid A and feed liquid B at the same time; Wherein feed liquid A is formed by mixing 8.7 parts of acrylic acid and 9.5 parts of water, and the dropping time is 3 hours; feed liquid B is formed by mixing and dissolving 0.2 parts of L-ascorbic acid and 22.5 parts of water, and the dropping time is 3.5h. After the dropwise addition of the two materials is completed, the temperature is kept at the final temperature for 1 to 1.5 hours, and the pH is adjusted to 7±1 with 32% sodium hydroxide solution to obtain the polycarboxylate water r...

Embodiment 3

[0029] Add 75 parts of isopentenol polyoxyethylene ether (TPEG-2400) into the four-neck flask, stir and dissolve 70 parts of water, and heat up to 25°C. After the polyether is completely dissolved, add 0.2 parts of sodium phosphate, Stir to dissolve, then add 0.87 parts of sodium hypophosphite, after the solid dissolves completely, add 1 part (mass concentration: 30%) of hydrogen peroxide, stir for 5 minutes, and drop the pre-configured feed liquid A and feed liquid B at the same time; Wherein feed liquid A is to be formed by mixing 6 parts of acrylic acid, 11.8 parts of hydroxyethyl acrylate and 28 parts of water, and the dropping time is 2.5 hours; feed liquid B is made of 0.16 parts of L-ascorbic acid and 25.8 parts of water It is formed by mixing and dissolving, and the dropping time is 3h. After the dropwise addition of the two materials is completed, the temperature is kept at the final temperature for 1 to 1.5 hours, and the pH is adjusted to 7±1 with 32% sodium hydroxi...

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Abstract

The invention discloses a polycarboxylate superplasticizer containing phosphate groups. The polycarboxylate superplasticizer is prepared from, by weight, 70-80 parts of unsaturated polyether monomer, 0.3-1.0 part of hydrogen peroxide, 2-10 parts of carboxylic acid, 0-18 parts of carboxylic ester, 0.5-1.5 parts of chain transfer agent, 9-28 parts of deionized water X for feed liquid A preparation, 0.1-0.2 part of reductant, 18-26 parts of deionized water Y for feed liquid B preparation and 45-80 parts of deionized water Z for dissolving large unsaturated polyether monomers. Due to the fact that the phosphate groups are introduced to molecular chains, the polycarboxylate superplasticizer containing the phosphate groups is high in water reducing rate and good in slump retaining performance and has very good sulfate and mud resistance capability. A preparation method is simple, the polycarboxylate superplasticizer is synthesized under normal temperature, the energy consumption is low, inorganic phosphate serves as the chain transfer agent, the price is low, the material cost is low, higher-price chain transfer agents in a traditional process can be replaced, and industrial production is easy.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a phosphoric acid group-containing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete mixed with polycarboxylate superplasticizer has remarkable characteristics such as high water reduction, high slump retention, high reinforcement and high durability, so polycarboxylate superplasticizer is more and more widely used in concrete engineering, especially railway in the industry. A large number of engineering examples and studies have shown that compared with naphthalene-based, melamine-based and sulfamate-based water-reducers, polycarboxylate-based water-reducers are more sensitive to the clay content of aggregates, mainly manifested as polycarboxylate-based water reducers. The water-reducing and dispersing ability of the acid-based water-reducing agent is severely reduced, the slump-preserving effect is poor, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F222/02C08F2/38C04B24/26C04B103/30
CPCC04B24/2605C04B24/2647C04B24/267C04B2103/302C08F2/38C08F283/065C08F220/281
Inventor 黄海汪志勇林春红陈娟滕茂茁孙迅瞿鑫明吴团华张有为
Owner ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD
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