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

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...

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.

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