Method for preparing polycarboxylic acid water reducing agent

A technology of polycarboxylate and water reducing agent, which is applied in the field of cement dispersants, can solve the problems of cement performance differences and adaptability, and achieve the effects of large plastic retention rate, reduced operating strength, and improved wide adaptability

Active Publication Date: 2012-07-25
山东华伟银凯建材科技股份有限公司
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Problems solved by technology

[0004] In practical engineering applications, there have always been compatibility problems between concrete admixtures and cement. There are many types of cement in my country, and there are differences in raw materials used in various places, resulting in significant differences in cement performance sometimes. Although polycarboxylate water reducers have many The excellent performance also has the problem of adaptability

Method used

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  • Method for preparing polycarboxylic acid water reducing agent

Examples

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example example 1

[0029] The molecular weight of MPEGMA is 1000, the molecular weight of APEG is 2000, and the molecular weight of NPEG is 750; the molar ratio MPEGMA:APEG:NPEG:MAA=1:1:0.1:3. The initiator is ammonium persulfate, its dosage is 0.8% of the total mass of the monomers, and it is made into a 1.0% aqueous solution.

[0030] Put APEG into the bottom water in advance, MPEGMA, NPEG, MAA, chain transfer agent and a certain amount of water to make a 55% aqueous solution and initiator ammonium persulfate solution, and add it dropwise to the bottom water at 90°C for 5 hours. . The weight ratio of water to all solid raw materials is 8:2. After adding the raw materials, keep it warm for 2 hours. After cooling down, adjust the pH to 8±0.5 with sodium hydroxide solution, which is the polycarboxylate water reducer product.

example example 2

[0032] The molecular weight of MPEGMA is 1000, the molecular weight of APEG is 1000, and the molecular weight of NPEG is 750; the molar ratio MPEGMA:APEG:NPEG:MAA=1:2:0.2:6. The initiator is ammonium persulfate, the amount of which is 0.8% of the mass of the monomer, and it is made into a 1.0% aqueous solution.

[0033] Put APEG into the bottom water in advance, MPEGMA, NPEG, MAA, chain transfer agent and a certain amount of water to make a 55% aqueous solution and initiator ammonium persulfate solution, and add it dropwise to the bottom water at 90°C for 5 hours. . The weight ratio of water to all solid raw materials is 8:2. After adding the raw materials, keep it warm for 2 hours. After cooling down, adjust the pH to 7-9 with sodium hydroxide solution, which is the polycarboxylate water reducer product.

example example 3

[0035] The molecular weight of MPEGMA is 1300, the molecular weight of APEG is 2000, and the molecular weight of NPEG is 1000; the molar ratio MPEGMA:APEG:NPEG:MAA=2:1:0.05:3. The initiator is ammonium persulfate, the amount of which is 0.5% of the mass of the monomer, and it is made into a 1.0% aqueous solution.

[0036] Put APEG into the bottom water in advance, MPEGMA, NPEG, MAA, chain transfer agent and a certain amount of water to make a 55% aqueous solution and initiator ammonium persulfate solution, and add it dropwise to the bottom water at 90°C for 5 hours. . The weight ratio of water to all solid raw materials is 8:2. After adding the raw materials, keep it warm for 2 hours. After cooling down, adjust the pH to 7-9 with sodium hydroxide solution, which is the polycarboxylate water reducer product.

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Abstract

The invention relates to a method for preparing a polycarboxylic water reducing agent, which belongs to the technical field of cement dispersant. The method is characterized in that the water reducing agent is essentially prepared by copolymerization of ester macromer, ether macromer, amine macromer and small carboxylic monomers. The method grafts different varieties of functional macromers on side chains through reasonable molecular structural design, so that the product has wide adaptability to different varieties of cement and the plasticity-maintaining rate of cement paste is larger.

Description

technical field [0001] The invention relates to a cement dispersant, in particular to a preparation method of a polycarboxylate water reducer with wide adaptability. Background technique [0002] High-performance concrete has excellent mechanical properties, durability and good construction performance, and has important application value for high-rise buildings, long-span bridges, underwater structures, super-long tunnels and other engineering structures with special requirements. Important building materials in construction. Freshly mixed high-performance concrete must have good fluidity, good pumpability and controllable slump loss to ensure construction requirements. High-efficiency water reducer is an indispensable additive for the production of high-performance concrete. Polycarboxylate water reducer is the third generation of high-performance chemical water reducer developed after the ordinary water reducer represented by wood calcium and the high-efficiency water r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C04B24/26C04B103/30
Inventor 贾吉堂段彬王惠忠张明曹玉林崔洪友
Owner 山东华伟银凯建材科技股份有限公司
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