A modified cyclodextrin self-assembled polycarboxylate water reducer and its preparation method

A cyclodextrin and polycarboxylic acid technology, which is applied in the field of concrete, can solve the problems of difficult to meet safety production, energy conservation and environmental protection, difficult to guarantee product quality, complicated preparation methods, etc., and achieves improved slump retention capability, low cost, and improved adaptability. Effect

Active Publication Date: 2019-08-20
CCCC SHEC WUHAN PORT NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although through the above research, the polycarboxylate superplasticizer containing cyclodextrin in the side chain has been successfully prepared, the preparation method is relatively complicated, including: esterification, sulfonylation, alcohol amine substitution, epoxy ring opening and free radical polymerization, etc. A variety of complex chemical reactions, it is difficult to meet the requirements of safe production, energy saving and environmental protection, product quality is also difficult to guarantee, and the economic cost is high

Method used

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  • A modified cyclodextrin self-assembled polycarboxylate water reducer and its preparation method
  • A modified cyclodextrin self-assembled polycarboxylate water reducer and its preparation method
  • A modified cyclodextrin self-assembled polycarboxylate water reducer and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0028] Dissolve 0.15 mol of hydroxypropyl-β-cyclodextrin in deionized water, add 0.15 mol of n-butyl acrylate, stir at room temperature for 1.0 h, add 1.0 mol of methallyl polyoxyethylene ether with a molecular weight of 2000 , heat up to 40°C, add 0.055mol hydrogen peroxide, add dropwise an aqueous solution containing 3.7mol acrylic acid, a mixed aqueous solution containing 0.016mol ascorbic acid and 0.056mol mercaptoacetic acid, the dropping time is 2h and 2.5h respectively, and keep warm for 1.0 h, then lower the temperature to 30°C, add liquid caustic soda and water with a mass fraction of 30%, adjust the pH value to 6-8, and obtain a product that is a modified cyclodextrin self-assembled polycarboxylate water reducer with a mass fraction of 40% PC-Z1.

Embodiment 2

[0030] Dissolve 0.15 mol of hydroxyethyl-β-cyclodextrin in deionized water, add 0.15 mol of n-propyl acrylate, stir at room temperature for 1.0 h, add 1.0 mol of polyethylene glycol monomethyl ether acrylate with a molecular weight of 2000, Raise the temperature to 60°C, add 0.069mol of hydrogen peroxide, add dropwise the aqueous solution containing 2.5mol acrylic acid and 1.2mol methacrylic acid, the mixed aqueous solution containing 0.015mol saffron and 0.07mol mercaptopropionic acid, and the dropping time is 2.5h and 3.0h, keep warm for 1.0h after the dropwise addition, then cool down to 50°C, add 30% mass fraction of liquid alkali and water, adjust the pH value to 6-8, and obtain the product which is 40% mass fraction of modified cyclodextrin Self-assembled polycarboxylate superplasticizer PC-Z2.

Embodiment 3

[0032]Dissolve 0.15 mol of hydroxyethyl-β-cyclodextrin in deionized water, add 0.15 mol of n-propyl methacrylate, stir at room temperature for 1.0 h, add 1.0 mol of polyethylene glycol monomethacrylate with a molecular weight of 2000 For methyl ether ester, heat up to 65°C, add 0.08mol hydrogen peroxide, add dropwise the aqueous solution containing 3.7mol methacrylic acid, the mixed aqueous solution containing 0.015mol sodium hypophosphite and 0.085mol mercaptoethanol, and the dropping time is 3.0h and 3.0h, keep warm for 1.5h after the dropwise addition, then lower the temperature to 50°C, add liquid caustic soda and water with a mass fraction of 30%, adjust the pH value to 6-8, and obtain a product that is a modified cyclodextrin with a mass fraction of 40% Self-assembled polycarboxylate superplasticizer PC-Z3.

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Abstract

The invention provides a modified cyclodextrin self-assembled polycarboxylate water reducer and its preparation method. First, the modified cyclodextrin is dissolved in deionized water, and a small lipophilic monomer containing an unsaturated double bond is added. , stirred at room temperature for 1-3 hours, then added polyether or polyester macromonomer, raised the temperature to 40-80°C, added dropwise the aqueous solution of unsaturated carboxylic acid monomer, the initiator and the mixed aqueous solution of chain transfer, and added dropwise The time is 2 to 4 hours. After the dropwise addition, keep warm for 1 to 2 hours, then cool down to 30 to 50°C; finally add alkali solution to adjust the pH value to 6 to 8, that is, the modified cyclodextrin self-assembled polycarboxylate Aqua. The invention solves the deficiency in the prior art, the preparation method of the water reducer is simple, the product can improve the workability of concrete, and greatly improves the adaptability to concrete.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a modified cyclodextrin self-assembled polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has become a research hotspot in domestic and foreign industries because of its advantages such as low dosage, high water reducing rate, good slump retention, low shrinkage, good volume stability, simple process, green environmental protection, and easy industrialization. . The designability of its molecular structure is strong, and the potential for high performance is great. It can prepare a multifunctional polycarboxylate water reducer by selecting monomers with different functions for copolymerization. However, in recent years, the construction of a large number of large-scale projects, passenger dedicated lines, water conservancy and hydropower projects, and the rise of the real estate industry have led to a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02C08F283/06C08F220/18C08F220/06C08F222/02C08F212/08C04B24/28C04B103/30
CPCC04B24/28C08F283/065C08G81/02C04B2103/302C08F220/18C08F220/1803C08F220/1804C08F220/1805
Inventor 李顺凯高玉军王文荣韦鹏亮
Owner CCCC SHEC WUHAN PORT NEW MATERIALS
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