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A kind of phosphate-containing high adaptability polycarboxylate water reducing agent and preparation method thereof

A phosphate ester and adaptable technology, applied in the field of building materials, can solve the problems of segregation bleeding, poor workability, poor adaptability, and insufficient slump-preserving performance, and achieve the goal of improving dispersion ability, strong adsorption capacity, and improving slump-preserving performance Effect

Active Publication Date: 2018-04-17
GUIZHOU TIEJIANHENGFA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a highly adaptable polycarboxylate water reducer containing phosphate and its preparation method, which solves the problem of poor adaptability of existing ether polycarboxylate water reducers, which are prone to retention of concrete with high mud content. Insufficient slump performance, segregated bleeding and poor workability

Method used

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  • A kind of phosphate-containing high adaptability polycarboxylate water reducing agent and preparation method thereof
  • A kind of phosphate-containing high adaptability polycarboxylate water reducing agent and preparation method thereof
  • A kind of phosphate-containing high adaptability polycarboxylate water reducing agent and preparation method thereof

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Embodiment 1

[0013] A preparation method of a highly adaptable polycarboxylate water reducer containing phosphate, comprising the following steps:

[0014] Add 125g of water and 160g of polyether macromonomer APEG to a 1000mL four-necked round-bottomed flask equipped with a thermometer, an electric stirrer, a constant temperature electric heating mantle, and a peristaltic pump. The molecular weight of the APEG used is 2000-24000. After dissolving evenly, directly add the mixed solution of 1.6g hydrogen peroxide and 7g water and stir for 10 minutes to fully dissolve it. A mixed aqueous solution consisting of 20 g of acrylic acid, 3 g of hydroxyethyl acrylate phosphate, 2 g of 2-methacrylic acid-3 (N, N-diacetamide)-2 hydroxypropyl ester, and 35 g of water was added dropwise within 3 hours. Mixed solution composed of 0.35g ascorbic acid, 0.86g mercaptopropionic acid, and 40g water, the temperature is kept between 58-61°C; after the dropwise addition, continue to react for 2 hours, then cool ...

Embodiment 2

[0017] A preparation method of a highly adaptable polycarboxylate water reducer containing phosphate, comprising the following steps:

[0018] Add 145g of water and 160g of polyether macromonomer HPEG into a 1000mL four-necked round-bottomed flask equipped with a thermometer, an electric stirrer, a constant temperature electric heating mantle, and a peristaltic pump. The molecular weight of the HPEG used is 2000-24000. After dissolving evenly, directly add the mixed solution of 1.8g hydrogen peroxide and 7g water and stir for 10 minutes to fully dissolve it. A mixed aqueous solution consisting of 22 g of acrylic acid, 2 g of hydroxyethyl acrylate phosphate, 2 g of 2-methacrylic acid-3 (N, N-diacetamide)-2 hydroxypropyl ester, and 35 g of water was added dropwise within 3 hours. A mixed solution composed of 0.25g of ascorbic acid, 0.95g of mercaptopropionic acid, and 40g of water is kept at a temperature between 58-61°C; after the dropwise addition, the reaction is continued fo...

Embodiment 3

[0021] A preparation method of a highly adaptable polycarboxylate water reducer containing phosphate, comprising the following steps:

[0022] Add 135g of water and 150g of polyether macromonomer TPEG to a 1000mL four-necked round-bottomed flask equipped with a thermometer, an electric stirrer, a constant temperature electric heating mantle, and a peristaltic pump. The molecular weight of the TPEG used is 2000-24000. After dissolving evenly, directly add the mixed solution of 1.5g hydrogen peroxide and 8g water and stir for 10 minutes to fully dissolve it. A mixed aqueous solution consisting of 18 g of acrylic acid, 4 g of hydroxyethyl acrylate phosphate, 3 g of 2-methacrylic acid-3 (N, N-diacetamide)-2 hydroxypropyl ester, and 35 g of water was added dropwise within 3 hours. Mixed solution composed of 0.32g ascorbic acid, 1.14g mercaptopropionic acid, and 40g water, keep the temperature between 58-61°C; continue to react for 2 hours after the dropwise addition, then cool down...

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Abstract

The invention discloses a phosphate containing high-adaptability polycarboxylate superplasticizer and a preparation method thereof.The phosphate containing high-adaptability polycarboxylate superplasticizer is prepared through the steps that unsaturated polyether macromonomers, micromonomers, unsaturated phosphate monomers, 2-methacrylic acid-3(N,N-oxalic acid amine)-2 hydroxy propyl ester, an initiator and a chain transfer agent react with water at the temperature of 50-80 DEG C for 3-6 hours, a copolymer is obtained, then the pH value is adjusted to range from 6.0 to 7.0 with alkaline matter, and a settled solution is obtained.Compared with a polycarboxylate superplasticizer, the phosphate containing high-adaptability polycarboxylate superplasticizer has higher adsorption capacity, sulfate in cement can be effectively resisted, the dispersing power of polycarboxylate is greatly improved, the phosphate structure can change the crystal morphology formed at the initial stage of ettringite, and then collapse protecting performance is improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a highly adaptable polycarboxylate water reducer containing phosphate and a preparation method thereof. Background technique [0002] In recent years, with the continuous expansion of the scale of civil engineering and the continuous improvement of the level of science and technology, some important buildings with high-rise, long-span and special functional requirements continue to appear, such as skyscrapers, super-long-span bridges, high-speed railways and giant water conservancy projects. Construction, etc. , requiring concrete to have higher strength, better durability, and better stability. Water reducing agent is one of the indispensable important components of high performance concrete. Water reducing agent can reduce the water consumption of concrete during use, improve its durability, improve the collapse retention, change the properties of concret...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F230/02C08F220/36C08F222/06C04B24/24C04B103/30
CPCC04B24/246C04B2103/302C08F283/065C08F220/365
Inventor 刘成舟李本秀王毓陈娟陈凯穆黔
Owner GUIZHOU TIEJIANHENGFA NEW MATERIAL TECH CO LTD
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