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
Comparison scheme
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 water reducer and a preparation method thereof, comprising the following raw materials in parts by weight: polyether macromonomer 350, deionized water 370-500, acrylic acid 40-55; chain transfer agent, adding The amount is 0.01-1% of the total weight of methyl alkenyl polyoxyethylene ether and acrylic acid; the concentration of the initiator aqueous solution is 2-10%, and the addition amount is 0.01-1% of the total weight of methyl alkenyl polyoxyethylene ether and acrylic acid 3%. The invention has the advantages of reasonable process, low preparation cost, and good performance. When the amount of the powder is converted to 0.2-0.4% of the concrete cementitious material, the water reducing rate can reach 28%, and the 3d compressive strength can be increased by 80%. -100%, the setting time is significantly shortened; the concrete has good workability, no large bubbles, and the appearance quality of the concrete is good; the alkali content is low; it does not contain chloride ions, and it is not corrosive to steel bars; it has good frost resistance and carbonation resistance. .

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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