Preparing method for fatty-group-modified polycarboxylate water reducer

Abstract

The invention provides a preparing method for fatty-group-modified polycarboxylate water reducer, and relates to the technical field of building materials. The preparing method includes the followingsteps that (1) sodium sulfite, sodium pyrosulfite and liquid caustic soda are added into deionized water, and a solution A is prepared; (2) formaldehyde, acetone and cyclohexanone are stirred to be even, and a solution B is prepared; (3) the solution B is dropwise added into the solution A, and aldehyde-ketone condensation liquid is obtained; (4) the aldehyde-ketone condensation liquid, methyl allyl polyoxyethylene ether and hydrogen peroxide are added into the deionized water, and a solution C is prepared; (5) crylic acid is taken and added into the deionized water, the mixture is mixed, anda solution D is prepared; (6) initiating agent and chain transfer agent are taken and added into the deionized water, the mixture is mixed and stirred to be even, and a solution E is prepared; (7) under the normal temperature condition, the solution D is added into the solution C, and meanwhile the solution E is dropwise added into a base solution; (8) dropwise adding is completed, and heat preservation stirring is carried out for 50 min. The preparing method has the advantages of being high in water reduction, low in mixing amount, high in water-reducing rate and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of an aliphatic modified polycarboxylate water reducer. Background technique [0002] According to the development process of water reducers, the development of water reducers is generally divided into three stages: the first generation of ordinary water reducers represented by wood calcium, and the second generation of high-efficiency water reducers represented by naphthalene and melamine , the third-generation high-performance water reducer represented by polycarboxylate. Water reducer is the simplest, most effective and economical technical means to reduce the amount of cement in concrete, improve the utilization rate of industrial waste residue, and improve concrete strength, work performance and durability. It is an essential material and core technology for modern concrete preparation, especially polymer Carboxylic acid high-performance supe...

AI Technical Summary

Problems solved by technology

[0003] With the technical development of polycarboxylate admixture and the continuous application in concrete engineering, the use of various high-performance concrete has created convenient conditions, which solved some of the original concrete engineering construction problems and greatly improved the concrete construction technology, but its The cost price is high, the water-reducing rate of aliphatic water-reducing agent is relatively low, no air entrainment, no retardation, large loss of concrete slump, over-mixing has little effect on concrete performance, and is not suitable for high-strength long-distance transportation, but Its cost is cheap, and it has good adaptability to mud content in sand and gravel.

In the prior art, there is simple physical mixing of aliphatic water reducer and polycarboxylate water reducer, but the effect of this method is not obvious

[0004] In the Chinese patent, formaldehyde, acetone, sodium bisulfite, and sodium hydroxide are used to react under certain conditions, and then the resulting product is synthesized into a polycarboxylate water reducer under certain conditions, but the reaction of the product is too violent and difficult to control , it is easy to cause the second-step polymerization reaction to fail or be very weak, and the products produced cannot meet the design requirements

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