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Main chain carboxy-density-adjustable high-efficiency polycarboxylic acid water reducing agent

A technology of water reducer and polycarboxylate, which is applied in the field of new polycarboxylate water reducer with adjustable main chain carboxyl density, which can solve the problems that do not involve the influence of main chain carboxyl density on the performance of polycarboxylate water reducer , to achieve the effect of improving the fluidity of the net pulp, good dispersibility and improving dispersibility

Inactive Publication Date: 2012-07-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relevant studies have not involved the influence of the carboxyl density of the main chain on the performance of polycarboxylate superplasticizers

Method used

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  • Main chain carboxy-density-adjustable high-efficiency polycarboxylic acid water reducing agent

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: This high-efficiency polycarboxylate water reducer with adjustable main chain carboxyl density, the main chain is polymerized from maleic anhydride, methacrylic acid, acrylic acid and styrene, wherein the amount of maleic anhydride is 0.5mol, methyl The content of acrylic acid is 50% of the amount of maleic anhydride, the content of acrylic acid is 10% of the amount of maleic anhydride, the content of styrene is 7.7% of the total moles of carboxyl groups, and the amount of ammonium persulfate is 3.0% of the total moles of unsaturated monomers. The side chain is polyethylene glycol monomethyl ether with a relative molecular weight of 2000, the content of which is 19.2% of the total molar number of carboxyl groups, and the main chain and side chain are connected by esterification.

[0031] During the synthesis of polycarboxylate water reducer, 49.0 g of maleic anhydride, 5.6 g of 50% NaOH, H 2 O 55.6 g, start the stirrer, and maintain a rotating speed of 150 re...

Embodiment 2

[0033] Example 2: This high-efficiency polycarboxylate water reducer with adjustable main chain carboxyl density, the main chain is polymerized from maleic anhydride, methacrylic acid, acrylic acid and styrene, wherein the amount of maleic anhydride is 0.5mol, methyl The content of acrylic acid is 30% of maleic anhydride, the content of acrylic acid is 5% of maleic anhydride, the content of α-methylstyrene is 150% of the total moles of carboxyl groups, and the amount of ammonium persulfate is 2.7% of the total moles of unsaturated monomers. %, the side chain is polyethylene glycol monomethyl ether with a relative molecular weight of 3000, the content is 10% of the total molar number of carboxyl groups, and the main chain and side chain are connected by esterification.

[0034] During the synthesis of polycarboxylate water reducer, 49.0 g of maleic anhydride, 5.6 g of 50% NaOH, H 2 O 55.6 g, start the stirrer, and maintain a rotating speed of 150 rev / min, then heat with a water...

Embodiment 3

[0036] Example 3: This high-efficiency polycarboxylate water reducer with adjustable main chain carboxyl density, the main chain is polymerized from maleic anhydride, methacrylic acid, acrylic acid and styrene, wherein the amount of maleic anhydride is 0.5mol, methyl The content of acrylic acid is 40% of maleic anhydride, the content of acrylic acid is 8% of maleic anhydride, the content of styrene is 1% of the total moles of carboxyl groups, and the amount of potassium persulfate is 1.0% of the total moles of unsaturated monomers. It is polyethylene glycol monomethyl ether with a relative molecular weight of 500, and its content is 40% of the total molar number of carboxyl groups. The main chain and side chain are connected by esterification reaction.

[0037] During the synthesis of polycarboxylate water reducer, 49.0 g of maleic anhydride, 5.6 g of 50% NaOH, H 2 O 55.6 g, start the stirrer, and keep the rotating speed of 150 rev / min, then water bath heating. When the tempe...

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Abstract

The invention discloses a novel main chain carboxy-density-adjustable high-efficiency polycarboxylic acid water reducing agent which has a comb-type structure. The main chain is mainly formed by randomly copolymerizing carboxy-containing unsaturated monomers and nonpolar unsaturated monomers; the side chain is long chain polyether; and the main chain and the side chain are connected through esterifying reaction to form the polycarboxylic acid water reducing agent. The nonpolar unsaturated monomers are used as the carboxy density regulator, and the consumption of the carboxy density regulator is regulated to effectively regulate the carboxy density in the water reducing agent main chain, thereby finely regulating the comprehensive properties of the water reducing agent. In addition, the unsaturated functional monomers containing sulfonic groups, amido groups or the like can be added according to needs to further improve the dispersity and solubility of the water reducing agent. The maximum water reducing rate of the water reducing agent is up to 42%; and when used in Portland cement or slag-base cementing material, the water reducing agent can obviously enhance the net slurry and mortar flowability of the product, the net slurry and mortar flowability retentivity, folding strength, compression strength and the like.

Description

technical field [0001] The invention relates to a novel polycarboxylate superplasticizer with adjustable main chain carboxyl density, which belongs to the technical field of fine chemicals. Background technique [0002] Water reducer is an essential chemical admixture to improve slag-based cementitious materials and concrete products. It can significantly improve the workability, compactness, strength and durability of products at a low water-cement ratio. comprehensive performance. Polycarboxylate water reducer is the third generation water reducer product, it can not only greatly improve the comprehensive performance of slag-based cementitious materials and concrete, but also has the characteristics of low dosage, green environmental protection, large degree of freedom of molecular structure, etc. The application prospect is extremely broad. At present, the research on polycarboxylate water reducers at home and abroad mainly focuses on the following aspects: (1) research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B24/16C04B103/30
Inventor 孙彦琳王红刘艳娜赵文波赵榆琳
Owner KUNMING UNIV OF SCI & TECH
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