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Special early-strength polycarboxylate superplasticizer for prefabricated parts and preparation method of special early-strength polycarboxylate superplasticizer

A technology of early-strength polycarboxylic acid and water-reducing agent, which is applied in the field of concrete admixtures, can solve the problems of poor concrete shrinkage effect and complicated process production, and achieve low slump retention, simple process, and early strong performance effect

Active Publication Date: 2015-04-08
东方雨虹民用建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They are all formed by free radical polymerization of compounds containing carboxylic acid groups, sulfonic acids, and amides. However, the production process is more complicated, and the shrinkage effect on concrete is not good.

Method used

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  • Special early-strength polycarboxylate superplasticizer for prefabricated parts and preparation method of special early-strength polycarboxylate superplasticizer
  • Special early-strength polycarboxylate superplasticizer for prefabricated parts and preparation method of special early-strength polycarboxylate superplasticizer
  • Special early-strength polycarboxylate superplasticizer for prefabricated parts and preparation method of special early-strength polycarboxylate superplasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put 1 mol of isopentenyl polyether, 0.5 mol of dimethyl fumarate and 130 mol of deionized water into a reaction flask, raise the temperature, and stir at 70°C to completely dissolve the reactants, then drop into the container Solubilize 1.25mo of l2-acrylamido-methylpropanesulfonic acid, 3.4mol of polypropylene glycol monoacrylate and 1.5mol of deionized water in water, 0.15mol of ammonium persulfate solution and 0.1mol of mercaptoethanol , Control the rate of addition, finish dropping within 3h, keep the temperature for 1 hour. After cooling, add 30% sodium hydroxide solution to adjust the pH to 6.5 to obtain a 50% solid early-strength polycarboxylate high-performance water reducer.

Embodiment 2

[0030] Put 1 mol of isopentenyl polyether, 0.4 mol of dimethyl fumarate and 100 mol of deionized water into a reaction flask, raise the temperature, stir at 65°C to completely dissolve the reactants, and then drop into the container 1.5 mol of 3-acrylamidophenylboronic acid, 3 mol of polypropylene glycol monoacrylate and 1.5 mol of deionized water, 0.2 mol of ammonium persulfate solution and 0.35 mol of sodium allyl sulfonate were dissolved, Control the rate of addition, finish dropping within 3 hours, and keep the temperature for 1 hour. After cooling, add 30% sodium hydroxide solution to adjust the pH to 6.5 to obtain a 50% solid early-strength polycarboxylate high-performance water reducer.

Embodiment 3

[0032] Put 1 mol of isopentenyl polyether, 0.5 mol of dimethyl fumarate and 100 mol of deionized water into a reaction flask, raise the temperature, stir at 60°C to completely dissolve the reactants, and then drop into the container 1.0 mol of methylol acrylamide, 4 mol of polypropylene glycol monoacrylate and 1.5 mol of deionized water are dissolved with 0.35 mol of ammonium persulfate solution and 0.4 mol of sodium methallyl sulfonate, Control the rate of addition, finish dropping within 3 hours, and keep the temperature for 1 hour. After cooling, add 30% sodium hydroxide solution to adjust the pH to 6.5 to obtain a 50% solid early-strength polycarboxylate high-performance water reducer.

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PUM

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Abstract

The invention discloses a special early-strength polycarboxylate superplasticizer for prefabricated parts. The special early-strength polycarboxylate superplasticizer is prepared by implementing copolymerization reaction on isopentenyl polyether and an acrylamide group monomer and acrylic polypropylene glycol monoester mixed solution together with dimethyl fumarate and a molecular weight modifier as well as an initiator. The special early-strength polycarboxylate superplasticizer disclosed by the invention is high in water reduction rate, high in early strength, relatively low in shrinkage rate, good in adaptability, free of formaldehyde pollution in the production process, and particularly applicable to prefabricated parts and cement products.

Description

technical field [0001] The invention relates to a special early-strength polycarboxylate water reducer for prefabricated components, which belongs to the field of concrete admixtures. Background technique [0002] In recent years, with the development of major projects such as high-speed railways, subways, and South-to-North Water Diversion, as well as large-scale urbanization, higher requirements have been put forward for concrete admixtures. Ensure the durability of concrete structures. Therefore, it is of great significance to study the early-strength polycarboxylate superplasticizer suitable for precast concrete to improve the early strength of concrete and accelerate the turnover speed of the formwork. [0003] Polycarboxylate superplasticizers have developed rapidly in China, although they have reached the level of foreign superplasticizers such as Japan and Germany. In the actual application of precast concrete, most of the composite early-strength superplasticizers...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F290/06C08F283/06C08F220/54C08F220/58C08F230/06C08F222/14C08F2/38
Inventor 王虎群熊卫峰段文锋
Owner 东方雨虹民用建材有限责任公司
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