Preparation method of high-efficiency polycarboxylate superplasticizer

A polycarboxylate and superplasticizer technology, which is applied in the field of preparation of high-efficiency polycarboxylate superplasticizers, can solve the problems of poor dispersion of polycarboxylate superplasticizers, and achieve improved fluidity, compactness, and compatibility Good performance, improve the effect of flexural and compressive strength

Inactive Publication Date: 2020-09-15
常德市俊德科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a preparation method of high-efficiency polycarboxylate water reducer, aiming to solve the problem of poor dispersibility of existing polycarboxylate water reducer

Method used

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  • Preparation method of high-efficiency polycarboxylate superplasticizer
  • Preparation method of high-efficiency polycarboxylate superplasticizer
  • Preparation method of high-efficiency polycarboxylate superplasticizer

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Experimental program
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Embodiment 1

[0017] The embodiment of the present invention provides a preparation method of high-efficiency polycarboxylate superplasticizer, comprising:

[0018] Under nitrogen atmosphere, take 60gCH 3 [OCH 2 CH 2 ] 6 [OCH 2 CH(CH 3 )] 29 NH 2 Put it into the flask and heat it to 130°C in an oil bath. With stirring, add 8 mL of glycidyl alcohol dropwise within 50 minutes. After the addition is completed, keep stirring at the temperature for 18 hours to react to obtain intermediate a.

[0019] Naturally cool intermediate a to 75°C, take 21g of intermediate a and add 1.9mL of 4mol / L sodium methoxide solution under stirring, keep the temperature and stir for 5h after the addition is completed, and carry out the reaction. After the reaction is completed, the methanol is distilled off under reduced pressure. 60mL of anhydrous tetrahydrofuran and stirred to raise the temperature to 130°C, then add 180mL of glycidol in tetrahydrofuran solution dropwise within 18 hours under stirring, whe...

Embodiment 2

[0022] The embodiment of the present invention provides a preparation method of high-efficiency polycarboxylate superplasticizer, comprising:

[0023] Under nitrogen atmosphere, take 30g CH 3 [OCH 2 CH 2 ] 19 [OCH 2 CH(CH 3 )] 3 NH 2 Put it into the flask and heat it to 120°C in an oil bath. With stirring, add 4 mL of glycidyl alcohol dropwise within 30 minutes. After the addition is completed, keep stirring at the temperature for 12 hours to react to obtain intermediate a.

[0024] Naturally cool intermediate a to 70°C, take 15 g of intermediate a and add 1.4 mL of 3.7 mol / L sodium methoxide solution under stirring, keep the temperature and stir for 2 hours after the addition is completed, and react under reduced pressure to remove methanol after the reaction is completed Then add 50mL of anhydrous tetrahydrofuran and stir to heat up to 120°C, then add 160mL of glycidol in tetrahydrofuran dropwise within 15 hours under stirring, wherein the volume ratio of glycidol to ...

Embodiment 3

[0027] The embodiment of the present invention provides a preparation method of high-efficiency polycarboxylate superplasticizer, comprising:

[0028] Under nitrogen atmosphere, take 50gCH 3 [OCH 2 CH 2 ] 41 NH 2 Put it into the flask and heat it to 150°C in an oil bath. With stirring, add 9 mL of glycidyl alcohol dropwise within 1 hour. After the addition is completed, keep stirring at the temperature for 24 hours to react to obtain intermediate a.

[0029] Naturally cool intermediate a to 75°C, take 25g of intermediate a and add 2mL of 4mol / L sodium methoxide solution under stirring, keep the temperature and stir for 6h to react after the addition is completed, and remove methanol by distillation under reduced pressure after the reaction is completed, then add 80mL Anhydrous tetrahydrofuran and stirring to heat up to 150 ° C, and then under stirring, dropwise add 190 mL of tetrahydrofuran solution of glycidol within 20 hours, wherein the volume ratio of glycidol to tetra...

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Abstract

The invention is applicable to the technical field of concrete admixtures, and provides a preparation method of a high-efficiency polycarboxylate superplasticizer. According to the invention, the polycarboxylate superplasticizer is prepared by combining epoxypropanol anion ring-opening polymerization with polyether amine; the polycarboxylate superplasticizer has a polyether amine long chain and adendritic polyepoxypropanol long chain at the same time, and has the advantages of low viscosity and large number of end groups, the end groups can form a plurality of contact points with cement particles, and the binding force between the polycarboxylate superplasticizer and cement is effectively increased. The dendritic structure can have large steric hindrance, and the dispersity of cement canbe improved after the dendritic structure is combined with cement particles. The polyether amine long chain can extend into gaps among the cement particles and prevent sulfate ions from invading, so that the binding force between the polycarboxylate superplasticizer and the cement particles is improved. The polycarboxylate superplasticizer prepared by the invention also has the advantages of highwater reducing rate, low mixing amount and good compatibility with cement, and can be used as an admixture for various types of concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a preparation method of a high-efficiency polycarboxylate water reducer. Background technique [0002] Concrete admixtures are chemical substances that are added in the process of mixing concrete, accounting for less than 5% of the cement mass, and can significantly improve the performance of concrete. Concrete admixtures are characterized by many varieties and small dosage, which have a great influence on the performance of concrete. They also have the characteristics of less investment, quick results, and significant technical and economic benefits. With the continuous advancement of science and technology, admixtures have been used more and more, and admixtures have become the fifth important component of concrete besides the four basic components of cement, sand, stone and water. Commonly used concrete admixtures are mainly naphthalene-based superplasticizers, po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G65/337C04B24/32C04B103/30
CPCC04B24/32C04B2103/302C08G65/2624C08G65/337
Inventor 李健沈舟
Owner 常德市俊德科技发展有限公司
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