A kind of slump-preserving polycarboxylate water reducer and its preparation method and application

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of building materials, can solve the problems of compatibility between retarder and cement, concrete quality hazards, cumbersome production process, etc., and achieve good slump retention ability and reaction conditions Simple and easy to control, good adaptability

Active Publication Date: 2018-09-04
江苏润天建材(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the re-mixing of water reducer and retarder may cause compatibility problems between retarder and cement, which will cause harm to the quality of concrete; The requirements are high, and the use value is not great
However, the existing improved water reducer has a large dosage, and the production process is cumbersome, time-consuming and costly.

Method used

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  • A kind of slump-preserving polycarboxylate water reducer and its preparation method and application
  • A kind of slump-preserving polycarboxylate water reducer and its preparation method and application
  • A kind of slump-preserving polycarboxylate water reducer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In the embodiment of the present invention, a slump-retaining polycarboxylate water reducer is composed of the following raw materials in parts by weight: 27 parts of polymethacrylic acid, 1 part of polyepoxysuccinic acid, 7 parts of casein, polyethylene glycol 5 parts of ethylene glycol ester, 3 parts of calamine.

[0018] Mix casein with 1% sodium hydroxide solution by mass to prepare a casein solution, wherein the mass ratio of casein to sodium hydroxide solution is 1:3.5. Crush the calamine, pass through a 100-mesh sieve, add anhydrous ethanol 4 times its mass, stir at a temperature of 52°C for 12 minutes, then add polyepoxysuccinic acid, stir at a temperature of 65°C for 20 minutes, and then Add casein solution and stir at 76°C for 30 minutes, add polymethacrylic acid and polyethylene adipate, seal and stir at 80°C for 40 minutes, then ultrasonicate at 68°C Treat for 20 minutes with an ultrasonic power of 800W, then centrifuge at a speed of 3000r / min for 5 minutes...

Embodiment 2

[0020] In the embodiment of the present invention, a slump-retaining polycarboxylate water reducer is composed of the following raw materials in parts by weight: 35 parts of polymethacrylic acid, 5 parts of polyepoxysuccinic acid, 15 parts of casein, polyethylene glycol 12 parts of ethylene glycol ester, 10 parts of calamine.

[0021] Mix casein with 1% sodium hydroxide solution by mass to prepare a casein solution, wherein the mass ratio of casein to sodium hydroxide solution is 1:3.5. Pulverize the calamine, pass through a 100-mesh sieve, add anhydrous ethanol 4 times its mass, stir at a temperature of 52°C for 15 minutes, then add polyepoxysuccinic acid, stir at a temperature of 65°C for 20 minutes, and then Add casein solution, and stir at 76°C for 30 minutes, add polymethacrylic acid and polyethylene adipate, seal and stir at 80°C for 45 minutes, and then sonicate at 68°C Treat for 20 minutes with an ultrasonic power of 800W, then centrifuge at a speed of 3000r / min for 5...

Embodiment 3

[0023] In the embodiment of the present invention, a slump-retaining polycarboxylate water reducer is composed of the following raw materials in parts by weight: 29 parts of polymethacrylic acid, 2 parts of polyepoxysuccinic acid, 9 parts of casein, polyethylene glycol 7 parts of ethylene glycol esters, 5 parts of calamine.

[0024] Mix casein with 1% sodium hydroxide solution by mass to prepare a casein solution, wherein the mass ratio of casein to sodium hydroxide solution is 1:3.5. Crush the calamine, pass through a 100-mesh sieve, add anhydrous ethanol 4 times its mass, stir at a temperature of 52°C for 13 minutes, then add polyepoxysuccinic acid, stir at a temperature of 65°C for 20 minutes, and then Add casein solution, stir at 76°C for 30 minutes, add polymethacrylic acid and polyethylene adipate, seal and stir at 80°C for 42 minutes, and then ultrasonicate at 68°C Treat for 20 minutes with an ultrasonic power of 800W, then centrifuge at a speed of 3000r / min for 5 minu...

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Abstract

The invention discloses a slump retaining type polycarboxylic acid water reducing agent, and a preparation method and application thereof. The water reducing agent is prepared from the following raw materials in parts by weight: 27 to 35 parts of polymethylacrylic acid, 1 to 5 parts of polyepoxysuccinic acid, 7 to 15 parts of casein, 5 to 12 parts of polyethylene glycol adipate and 3 to 10 parts of calamine; the calamine is smashed; absolute ethyl alcohol is added for heat stirring treatment; the polyepoxysuccinic acid is added, and heat stirring treatment is performed; then, the casein solution is added, and heat stirring treatment is performed; the polymethacrylic acid and the polyethylene glycol adipate are added; heat treatment, ultrasonic treatment and centrifugal treatment are performed; filter liquor is taken; heat stirring treatment is performed; the water reducing agent is obtained. The water reducing agent has the advantages of high slump retaining performance, excellent dispersion performance and good adaptability; the preparation process is simple; the control is easy; the reaction period is short; no pollution exists; the energy consumption is low; a good effect is also achieved on reducing the slump loss of concrete under the condition of low mixing content; the concrete water loss and evaporation due to long-time transportation and high temperature can be reduced; the industrial production is easily realized.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a slump-retaining polycarboxylate water reducer and its preparation method and application. Background technique [0002] With the development of science and technology and the needs of construction projects, the research and production of concrete water reducers have tended to develop in the direction of high performance and pollution-free. The polycarboxylate high-efficiency water reducer represented by polyacrylate and its graft copolymer has become the development direction of the future high-efficiency water reducer due to its high water-reducing rate, low dosage, good dispersibility and other excellent properties. With the application of polycarboxylate superplasticizers in concrete engineering, some shortcomings have gradually emerged. For example, due to differences in temperature, raw materials and construction techniques, the slump of concrete will lose a lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/28C04B103/30
CPCC04B40/0039C04B2103/302C04B24/2641C04B24/281C04B24/283C04B14/26C04B24/14
Inventor 汪培杰
Owner 江苏润天建材(集团)有限公司
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