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High-performance polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of high-performance polycarboxylate water reducer and its preparation, can solve the problems of long reaction cycle time, increased production cost, long production cycle, etc. Improved compressive strength and strong product adaptability

Inactive Publication Date: 2016-11-23
北京麦凯特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of the polycarboxylate water reducer in the prior art has the following disadvantages: the synthesis process requires esterification and polymerization, the production cycle is long, and the operation is troublesome and the cost is high. It is gradually being replaced by the ether polycarboxylate water reducer
Moreover, the process of synthesizing ether-based water reducers is common in the market: polyether monomers are used as raw materials. In the redox system, active monomers and chain transfer agents are prepared by dropwise addition. The reaction cycle time is longer and can Consumption is large, increasing the production cost of the product

Method used

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  • High-performance polycarboxylate superplasticizer and preparation method thereof
  • High-performance polycarboxylate superplasticizer and preparation method thereof
  • High-performance polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Put 350 parts of methyl alkenyl polyoxyethylene ether (molecular weight 2400) and 370 parts of deionized water into the reactor, stir and heat up, and keep stirring at a temperature of 50-60°C to completely dissolve the reactants, and then add Put 55 parts of acrylic acid and 3 parts of mercaptopropionic acid into the container at one time, and add 200 parts of 2% ammonium persulfate aqueous solution dropwise at the same time. The dropping time is 1.5 hours. The high-performance polycarboxylate water reducer of the present invention can be prepared by adjusting the pH of the solution to 5-6 with aqueous sodium hydroxide solution, marked as MT-1. The experimental data are shown in Table 1 and Table 2 of the example experimental data.

Embodiment 2

[0022] Put 350 parts of methyl alkenyl polyoxyethylene ether (molecular weight 2400) and 450 parts of deionized water into the reactor, stir and heat up, and keep stirring at a temperature of 50-60°C to completely dissolve the reactants, and then add Put 40 parts of acrylic acid and 4 parts of mercaptopropionic acid into the container at one time, and add 150 parts of 5% ammonium persulfate aqueous solution dropwise at the same time. The dropping time is 100 minutes. Sodium hydroxide aqueous solution adjusts the pH of the solution to 5-6, and the high-performance polycarboxylate water reducer of the present invention can be prepared, marked as MT-2. The experimental data are shown in Table 1 and Table 2 of the example experimental data.

Embodiment 3

[0024] Put 350 parts of methyl alkenyl polyoxyethylene ether (molecular weight 2400) and 400 parts of deionized water into the reactor, stir and heat up, and keep stirring at a temperature of 50-60°C to completely dissolve the reactants, and then add Put 45 parts of acrylic acid and 3 parts of mercaptopropionic acid into the container at one time, and add 100 parts of 8% ammonium persulfate aqueous solution dropwise at the same time. The dropping time is 80 minutes. Sodium hydroxide aqueous solution adjusts the pH of the solution to 5-6, and the high-performance polycarboxylate water reducer of the present invention can be prepared, which is marked as MT-3. The experimental data are shown in Table 1 and Table 2 of the example experimental data.

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Abstract

The invention discloses a high-performance polycarboxylate superplasticizer and a preparation method thereof. The high-performance polycarboxylate superplasticizer is prepared from, by weight, 350 parts of polycarboxylate superplasticizer macromonomers, 370-500 parts of deionized water, 40-55 parts of acrylic acid, a chain transfer agent and an initiator water solution, wherein addition quantity of the chain transfer agent is 0.01-1% of the total weight of methyl alkenyl polyethenoxy ether and acrylic acid, and concentration of the initiator water solution is 2-10%, and addition quantity of the initiator water solution is 0.01-3% of the total weight of methyl alkenyl polyethenoxy ether and acrylic acid. The high-performance polycarboxylate superplasticizer has advantages that reasonable process, low preparation cost and excellent service performances are achieved, and when mixing amount converted powder is 0.2-0.4% of a concrete cementing material, water reducing rate can reach 28%, 3d compressive strength is increased by 80-100%, and setting time is shortened evidently; high concrete workability, freeness of large bubbles, high concrete appearance quality, low alkali content, freeness of chloride ions and rebar corrosion and excellent anti-freeze and anti-carbonization performances are realized.

Description

technical field [0001] The invention relates to a high-performance polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Compared with high-efficiency water-reducing agents such as naphthalene-based, melamine-based, and sulfamate, polycarboxylate-based water-reducing agents have low dosage, high water-reducing rate, good fluidity and slump retention of fresh concrete, low shrinkage, Environmental friendliness, good compatibility with cement, admixtures and other admixtures have become the direction of development and application in recent years and even in the future. The ester polycarboxylate superplasticizer represented by (methoxy)polyethylene glycol mono(meth)acrylate has good dispersibility and slump retention, and has strong cement adaptability, and is widely used. [0003] In recent years, my country has achieved rapid development in the research and application of polycarboxylate superplasticizers, and its consumption is also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/30
Inventor 潘冰
Owner 北京麦凯特科技有限公司
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