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Compound polycarboxylate superplasticizer and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of compound polycarboxylate water reducing agent and its preparation, can solve the problems of reduced comprehensive performance of concrete, poor mud resistance, easy insertion, etc., and achieves no toxic side effects and stable properties. , the effect of increasing the physical size

Active Publication Date: 2015-07-08
甘肃智通云翔交通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the technical problem that the side chain of the existing polycarboxylate superplasticizer is easy to insert into the layered structure of clay, resulting in poor mud resistance, which in turn leads to a decline in the comprehensive performance of concrete

Method used

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  • Compound polycarboxylate superplasticizer and preparation method thereof
  • Compound polycarboxylate superplasticizer and preparation method thereof
  • Compound polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]The hydroxyl-terminated polyether macromonomer of Example 1 is obtained by esterifying the terminal hydroxyl of the polyether macromonomer with the carboxyl group of a macromolecular carboxylic acid under the catalysis of a catalyst; the polyether The molar ratio of the macromonomer to the macromolecular carboxylic acid is 1:0.2-1; the reaction temperature of the esterification reaction is 80°C-130°C. Wherein the polyether macromonomer adopts isopentenyl polyoxyethylene ether (TPEG) or isobutenyl polyoxyethylene ether (HPEG). Specifically, the catalyst can use p-toluenesulfonic acid or sulfamic acid, and its consumption depends on the consumption of the polyether macromonomer; specifically, the consumption of the catalyst can be 2% of the mass of the polyether macromonomer ~6%.

[0047] Specifically, the catalyst uses p-toluenesulfonic acid or sulfamic acid.

[0048] The structural formula of the polyether macromonomer that is esterified at the hydroxyl end is as follo...

Embodiment 2

[0061] Since the esterification reaction is a reversible reaction, if the H generated during the esterification reaction 2 Accumulation of O in the reaction vessel will accelerate its reverse reaction. Therefore, in order to improve the efficiency of the esterification reaction, on the basis of the raw material of the polyether macromonomer that is esterified with terminal hydroxyl groups used in Example 1, in the raw material of the polyether macromonomers that are esterified with terminal hydroxyl groups in this embodiment, add A water-carrying agent is used, and the amount of the water-carrying agent is 10% to 20% of the mass of the polyether macromonomer. Specifically, cyclohexane can be used.

[0062] Further, in order to prevent the double bond polymerization of the reaction raw material polyether macromonomer in the reaction process, in the esterification reaction, a polymerization inhibitor is also added; the consumption of the polyether macromonomer is 0.05% to 0.5%...

Embodiment 3

[0067] The polycarboxylate superplasticizer mother liquor is obtained by mixing the hydroxyl-terminated polyether macromonomer described in Example 1 with water, an initiator, a chain transfer agent and acrylic acid for heating and reaction, and then adding it to the alkaline solution And the pH value is obtained after reaching 6-7.

[0068] The mixing ratio of the hydroxyl-terminated polyether macromonomer and water, initiator, chain transfer agent and acrylic acid used in the polycarboxylate superplasticizer mother liquor of the present invention adopts the existing mixing ratio, and the existing initiator , chain transfer agent. However, as an example, this Example 3 gives a specific ratio, but it cannot limit the polycarboxylate superplasticizer mother liquor of the present invention.

[0069] The molar ratio of water, initiator, chain transfer agent and acrylic acid used in Example 3 to the molar ratio of the hydroxyl-terminated polyether macromonomer is shown in Table 1...

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Abstract

The invention provides a compound polycarboxylate superplasticizer and a preparation method thereof. The compound polycarboxylate superplasticizer comprises a polycarboxylate superplasticizer mother solution, wherein the polycarboxylate superplasticizer mother solution is obtained by the steps of mixing a terminal hydroxyl esterifiable polyether macromonomer, water, an initiator, a chain transfer agent and acrylic acid, reacting while heating and neutralizing until the pH value is up to 6-7; and the terminal hydroxyl esterifiable polyether macromonomer is obtained by carrying out esterification reaction on the terminal hydroxyl of a polyether macromonomer and carboxyl of macromolecular carboxylic acid under the catalytic action of a catalyst. The terminal hydroxyl esterifiable polyether macromonomer takes the macromolecular carboxylic acid as a terminal blocking group of the polyether macromonomer, so that the physical size of the tail end of a side chain is greatly increased, then, the physical size of the tail end of the side chain of the polycarboxylate superplasticizer mother solution synthesized and prepared by using the terminal hydroxyl esterifiable polyether macromonomer is greatly increased, the polycarboxylate superplasticizer mother solution is not easily inserted to a laminated structure of clay, and furthermore, a mud-resistant effect is achieved. Then, the polycarboxylate superplasticizer mother solution is compound to form the compound polycarboxylate superplasticizer provided by the invention, so that the working performance of concrete is better ensured.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer, in particular to a compound polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Water reducing agent is the most widely researched and applied concrete admixture at present, and admixture has become the fifth important component in concrete besides cement, sand, stone and water. As a new generation of water reducing agent, polycarboxylic acid has the advantages of low dosage, good slump retention performance, low concrete shrinkage, strong molecular structure adjustability, simple production process and environmental friendliness. It is recognized as the future development direction of concrete admixtures. [0003] In actual use, because the side chains of polycarboxylate superplasticizers are easily inserted into the layered structure of clay, the dispersion performance of polycarboxylate superplasticizers in concrete containing cl...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B103/30
Inventor 徐一伦但维吕红雨
Owner 甘肃智通云翔交通科技有限公司
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