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Polycarboxylate superplasticizer and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, applied in the field of polycarboxylic acid water reducing agent, can solve the problems of shielding, difficult to control molecular structure, unable to give full play to the role of POSS group, etc., and achieve simplified use process and good mud resistance. and early strength function, the effect of easy control of the preparation process

Active Publication Date: 2020-12-18
武汉艾博思特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent with the application number 201710759362.2 discloses a preparation method of a polycarboxylate water reducer using octavinyl-POSS as a monomer, but since there are eight vinyl groups in this monomer, it is easy to cause polycarboxylate water reducer. Cross-linking of water agent, difficult to control molecular structure, synthesis of polycarboxylate superplasticizer with comb structure
In addition, the POSS group is connected to the main chain, which is easily shielded by the long branched polyether chain, and cannot give full play to the role of the POSS group.

Method used

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  • Polycarboxylate superplasticizer and preparation method thereof
  • Polycarboxylate superplasticizer and preparation method thereof
  • Polycarboxylate superplasticizer and preparation method thereof

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preparation example Construction

[0042] Step 1, the preparation of heptaisobutylaminopropyl POSS

[0043] The preparation process of heptaisobutylaminopropyl POSS is described in the master's thesis of Huazhong University of Science and Technology Han Chang (Han Chang. Synthesis of MRI contrast agent ligands containing monoamino POSS [D]. Wuhan: Huazhong University of Science and Technology, 2012.) method is carried out.

[0044] Step 2: Preparation of the second polyether macromonomer modified by POSS

[0045] 50 g of polyether macromonomer HPEG with a weight average molecular weight of 2400 was dissolved in 100 ml of THF / DMF, and 30 ml of triethanolamine solution containing 4.032 g of p-toluenesulfonyl chloride (TsCl) was added dropwise at 0°C. After stirring at 20°C for 12 hours, the solution with a pH value of 7-8 was neutralized with hydrochloric acid, concentrated by rotary evaporation, the filtrate was refrigerated at 4°C overnight, and suction filtered. The sample obtained by suction filtration was ...

Embodiment 1

[0049] The second polyether macromonomer and 45g HPEG (molecular weight 2400) of 45g HPEG-POSS modification are placed in reactor, add 90g water and dissolve, add 1.2g massfraction in reactor and be the hydrogen peroxide of 27.5%, be warming up to Stir well at 20°C. Add 10g of water to 10g of acrylic acid to dissolve to prepare drop solution X; add 0.2g of vitamin C and 0.38g of thioglycolic acid to 30g of water to prepare drop solution Y; control the temperature in the reactor at 30± At 2°C, start to add dropwise solutions X and Y at the same time, and the dropping time is 3h and 3.5h respectively. Neutralize until the pH value is 6-7, and the obtained polycarboxylate water reducer is named PCE1.

Embodiment 2

[0051] Put 35g VPEG-POSS and 45g TPEG (molecular weight 3600) in the reactor, add 80g water to dissolve, add 1.2g hydrogen peroxide with a mass fraction of 27.5% into the reactor, heat up to 20°C and stir evenly. Add 10g of water to 20g of acrylic acid to dissolve to prepare drop solution X; add 0.2g of vitamin C and 0.38g of thioglycolic acid to 30g of water to prepare drop solution Y; control the temperature in the reactor at 30± At 2°C, start to add dropwise solutions X and Y at the same time, and the dropping time is 3h and 3.5h respectively. Neutralize to a pH value of 6-7, and the obtained polycarboxylate water reducer is named PCE2.

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Abstract

The invention relates to a polycarboxylate superplasticizer which is a random copolymer formed by more than or equal to 10% and less than or equal to 20% of unsaturated carboxylic acid A, more than orequal to 45% and less than or equal to 75% of first polyether macromonomer B and more than or equal to 10% and less than or equal to 45% of POSS modified second polyether macromonomer C. According tothe invention, the polycarboxylate superplasticizer has a comb-shaped structure of a traditional polycarboxylate superplasticizer, part of long-chain branch end groups contain POSS groups, and the polycarboxylate superplasticizer can be used as a composite polycarboxylate superplasticizer with good water reducing performance, mud resistance and early strength performance at the same time.

Description

technical field [0001] The invention relates to the field of water reducers, in particular to a polycarboxylate water reducer. Background technique [0002] Polycarboxylate superplasticizer, as a high water-reducing, green product, has become the mainstream product in water reducer, but in the development process of polycarboxylate superplasticizer, it also faces new problems. For example, it has poor adaptability to sand and gravel with high mud content. In order to improve the mud resistance of polycarboxylate superplasticizers, some researchers have introduced groups with large spatial dimensions such as β-cyclodextrin and starch into the molecule, but these groups contain a large number of retarding groups. It will delay the setting of cement and prolong the project period. The patent with application number 201710759362.2 discloses a preparation method of polycarboxylate water reducer using octavinyl-POSS as a monomer, but since there are eight vinyl groups in this mo...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F283/12C08F220/06C08G77/46C04B24/26C04B103/30
CPCC08F283/065C08F283/124C08G77/46C04B24/2694C04B2103/302C08F220/06
Inventor 陈刚陈学兵
Owner 武汉艾博思特科技有限公司
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