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Polycarboxylate-type cement water-reducing agent and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of polymers, can solve the problem of low cost performance of polycarboxylate, and achieve the effects of low cost, good slump retention and good dispersion

Inactive Publication Date: 2013-04-03
TAIYUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to reduce production costs or improve cost performance, many researchers or manufacturers are still exploring new formulas. Among them, using cheap maleic anhydride as raw material to partially replace other unsaturated acids or unsaturated sulfonic acids has been studied more, from many According to the patent, when maleic anhydride is used as a monomer to copolymerize with macromonomer allyl polyglycol ether or other alkenyl polyglycol ethers, (meth)acrylic acid or acrylamide (AM) should be used in combination to Adjust the polymerization activity, but from the perspective of practical application, the cost performance of polycarboxylic acid is not high

Method used

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  • Polycarboxylate-type cement water-reducing agent and preparation method thereof
  • Polycarboxylate-type cement water-reducing agent and preparation method thereof
  • Polycarboxylate-type cement water-reducing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] The alkenyl polyoxyethylene ether macromonomer is selected from methoxy-terminated allyl polyethylene glycol ether, molecular weight 1000, (the molar basis is 1), monomethyl maleate and N-glycine-based maleamide The molar number (relative to benchmark) of acid mixture is 1.0, and the molar percentage of maleic acid monomethyl ester and N-glycine base maleamic acid in this mixture is 35%: 65%, acrylic acid (AA) molar number ( Relative to the benchmark) is 2, ammonium persulfate is the initiator, the addition of the initiator is 2.0% of the total weight of the monomer, and the required deionized water is added according to the solid content of 35%, and the two types of monomers A and B And part of the water is used as the base material, the aqueous solution of the acrylic acid monomer and the initiator is added dropwise separately, the polymerization temperature is 75-80 ℃, and the polymerization reaction is 6.0 hours to obtain the polymer, which is neutralized with NaOH t...

Embodiment 2

[0023] The alkenyl polyoxyethylene ether macromonomer is selected from methoxy-terminated allyl polyethylene glycol ether, molecular weight 1000, (the molar basis is 1), monomethyl maleate and N-glycine-based maleamide The molar number (relative to the benchmark) of the mixture of acids is 1.0, and the molar percentages of the two in the mixture are respectively 80%: 20%, the molar number of acrylic acid (AA) (relative to the benchmark) is 2.0, and ammonium persulfate is the initiator The addition amount of the initiator is 2.5% of the total weight of the monomer, and the required deionized water is added according to the solid content of 35%. The two types of monomers A and B and part of the water are used as primers. The aqueous solution of the agent was added dropwise separately, the polymerization temperature was 80-85°C, and the polymerization reaction was 5.0 hours to obtain a polymer, which was neutralized with NaOH to obtain a polycarboxylate water reducer, which was de...

Embodiment 3

[0025] Alkenyl polyoxyethylene ether macromonomer selects allyl polyethylene glycol ether, molecular weight 1000, (mole number basis is 1), the mole of the mixture of itaconate monomethyl ester and N-glycine base maleamic acid number (relative to the benchmark) is 1.0, and the molar percentages of the two are respectively 70%: 30% in the mixture, the molar number of acrylic acid (AA) (relative to the benchmark) is 2.0, ammonium persulfate is the initiator, and the The addition amount is 2.5% of the total weight of the monomers, and the required deionized water is added according to the solid content of 35%. The two types of monomers A and B and part of the water are used as primers. Add dropwise, the polymerization temperature is 80-85°C, and the polymerization reaction takes 5.0 hours to obtain a polymer, which is neutralized with NaOH to obtain a polycarboxylate water reducer, which is designated as PC3. See Table 1 for the relationship between the slurry fluidity of cement ...

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Abstract

The invention discloses a polycarboxylate-type high-performance cement water-reducing agent, which is prepared by copolymerizing vinyl polyoxyethylene ether which is taken as a big monomer, a mixture of derivatives of binary anhydride and micro-molecular monohydric alcohol or dihydric alcohol as well as derivatives of maleic anhydride and amino acid taken as an unsaturated monomer, and an acrylic monomer which is comparatively high in activity. The water-reducing agent disclosed by the invention is low in cost, good in dispersion, excellent in slump loss resistant property, high in strength of the concrete, and high in cost performance.

Description

technical field [0001] The invention belongs to the field of macromolecules, and in particular relates to a polycarboxylate cement water reducer and a preparation method thereof. Background of the invention [0002] Polycarboxylate high-performance water reducer (superplasticizer) is becoming the main water reducer for concrete due to its advantages of good dispersibility, high water reducing rate, good slump retention, and environmental friendliness in the preparation process and use process. Variety, from the structure and composition of the polymerized monomers of the existing commercialized polycarboxylic acid-based high-efficiency water reducers, it is mainly polymerized with polyoxyethylene ether or ester macromonomers with unsaturated double bonds and unsaturated acids. In order to reduce the cost or improve the adaptability to cement, some monomers such as sodium alkenyl sulfonate and maleic anhydride (maleic anhydride) can be added to form comb-shaped composites in ...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C04B103/30
Inventor 吕志平孙晋平孙诚轩李国伟孙佳悦张鑫孙建
Owner TAIYUAN UNIV OF TECH
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