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A phosphate-containing mud-resistant polycarboxylate water reducer and a preparing method thereof

A technology of phosphate ester and polycarboxylic acid, which is applied in the field of building materials, can solve the problems of insufficient slump performance of concrete, poor adaptability, segregation and bleeding, etc., and achieve the effects of novel structure, improved slump performance, and improved dispersion ability

Inactive Publication Date: 2019-05-21
江西省建筑材料工业科学研究设计院
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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 phosphate-containing anti-mud type polycarboxylate water reducer and its preparation method, which solves the problem of poor adaptability of existing polycarboxylate water reducers and the tendency to have slump retention performance for concrete with high mud content Insufficient defects and problems such as segregation bleeding and poor workability

Method used

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  • A phosphate-containing mud-resistant polycarboxylate water reducer and a preparing method thereof
  • A phosphate-containing mud-resistant polycarboxylate water reducer and a preparing method thereof
  • A phosphate-containing mud-resistant polycarboxylate water reducer and a preparing method thereof

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Embodiment 1

[0022] A preparation method of phosphate-containing anti-mud type polycarboxylate water reducer, comprising the following steps:

[0023] Add 123g of water and 155g 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 2400. After uniformity, directly add the mixed solution of 1.8g hydrogen peroxide and 8g water and stir for 8 minutes to fully dissolve it. Within 3 hours, add dropwise the mixed aqueous solution consisting of 22g of acrylic acid, 4g of unsaturated phosphoric acid ester, 2g of glycidyl methacrylate, and 38g of water, and the mixed solution of 0.30g of ascorbic acid, 0.80g of mercaptopropionic acid, and 45g of water. Keep it between 57-60°C; continue to react for 2 hours after the dropwise addition, then cool down to 30-35°C, add 30% sodium hydroxide solution and dilution water to ...

Embodiment 2

[0026] A preparation method of phosphate-containing anti-mud type polycarboxylate water reducer, comprising the following steps:

[0027] Add 140g of water and 155g of polyether macromonomer HPEG 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. After uniformity, directly add the mixed solution of 1.8g hydrogen peroxide and 8g water and stir for 10 minutes to fully dissolve it. Within 3 hours, add dropwise the mixed aqueous solution consisting of 22g of acrylic acid, 4g of unsaturated phosphoric acid ester, 2g of glycidyl methacrylate, and 38g of water, and the mixed solution of 0.30g of ascorbic acid, 0.85g of mercaptopropionic acid, and 45g of water. Keep it between 57-60°C; continue to react for 2 hours after the dropwise addition, then cool down to 35-40°C, add 30% sodium hydroxide solution and dilution water to obtain a pH of 6-7 and a concentration of abou...

Embodiment 3

[0030] A preparation method of phosphate-containing anti-mud type polycarboxylate water reducer, comprising the following steps:

[0031] Add 135g of water and 150g of polyether macromonomer TPEG to a 1000mL four-necked round-bottom 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 2400. After uniformity, directly add the mixed solution of 1.5g hydrogen peroxide and 8g water and stir for 10 minutes to fully dissolve it. Within 3 hours, add dropwise the mixed aqueous solution consisting of 18g of acrylic acid, 4g of unsaturated phosphoric acid ester, 3g of glycidyl methacrylate, and 35g of water, and the mixed solution of 0.32g of ascorbic acid, 1.14g of mercaptopropionic acid, and 40g of water. Keep it between 57-60°C; continue to react for 2 hours after the dropwise addition is completed, then cool down to 35-40°C, add 30% sodium hydroxide solution and diluti...

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Abstract

A phosphate-containing mud-resistant polycarboxylate water reducer is provided and has a general chemical formula shown as a formula (I), wherein R1 is -H or -CH3, R2 is -CH2- or -CH2CH2-, R3 is -H, -COOH or -CH2COOH, R4 is -H or an alkali metal ion, and x, y, z, m and n are non-zero integers. The provided polycarboxylate water reducer has higher adsorption capacity than existing polycarboxylate water reducers, can effectively resist sulfates in cement, has greatly improved dispersion capability, and can change crystal morphology formed in the initial period of ettringite, thus improving slump loss resistance. The invention further provides a preparing method of the phosphate-containing mud-resistant polycarboxylate water reducer.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a phosphate-containing mud-resistant polycarboxylate water reducer 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 and long-span and special functional requirements continue to appear, requiring concrete to have higher strength, better durability, and better stability. Polycarboxylate superplasticizer has many advantages such as low dosage, high water reducing rate, high slump retention performance, adjustable molecular structure, and environmental friendliness, and has been widely used in concrete. However, in the actual production and application of concrete, it is found that with the rapid increase in the amount of infrastructure projects, the consu...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/32C08F222/06C08F230/02C08F220/06C04B24/26C04B103/30
Inventor 邹小平刘成舟习海平张建强柴天红
Owner 江西省建筑材料工业科学研究设计院
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