Polycarboxylic acid water reducing agent and method for preparing same

A technology of water reducer and polycarboxylic acid, applied in the field of polycarboxylate water reducer and its preparation

Inactive Publication Date: 2016-07-20
南通瑞特建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is difficult to produce polycarboxylate water reducers with high water reducing rate and excellent slump retention in China. The products generally have only one feature, so they often need to be used in combination with other admixtures

Method used

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preparation example Construction

[0052] Another object of the present invention is to provide the preparation method of polycarboxylate superplasticizer, described method comprises the following steps:

[0053] 1) Weigh polyethylene glycol monomethyl ether methacrylate, 2-methallyl alcohol polyoxyethylene ether, sulfonated cyclodextrin maleic anhydride ester, acrylic acid, ammonium persulfate and water in parts by weight;

[0054] 2) Add polyethylene glycol monomethyl ether methacrylate, 2-methallyl alcohol polyoxyethylene ether, sulfonated cyclodextrin maleic anhydride ester, and acrylic acid to prepare a solution with a concentration of 25-45% respectively , while adding an appropriate amount of water to dissolve ammonium persulfate;

[0055] 3) Add the mixed solution of 2-methallyl alcohol polyoxyethylene ether and sulfonated cyclodextrin maleic anhydride ester obtained in step 2) into the reaction kettle, pass in protective gas nitrogen, insert a condenser tube, stir and heat up to 70-100°C, start to dro...

Embodiment approach 1

[0060] Embodiment 1, a polycarboxylate water reducer, the polycarboxylate water reducer includes the following components in parts by weight:

[0061] Polyethylene glycol monomethyl ether methacrylate 100 parts

[0062] 35-75 parts of 2-methallyl alcohol polyoxyethylene ether

[0063] Sulfonated cyclodextrin maleic anhydride ester 25-50 parts

[0064] 20-30 parts of acrylic acid

[0065] Ammonium persulfate 2-6 parts

[0066] Sodium hydroxide 3-8 parts

[0067] 100-700 parts of water;

[0068] Wherein, the sulfonated cyclodextrin maleic anhydride ester is prepared from sulfonated cyclodextrin and maleic anhydride.

Embodiment approach 2

[0069] Embodiment 2 is the same as Embodiment 1, except that the polyethylene glycol monomethyl ether methacrylate has a molecular weight of 900-1800.

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Abstract

The invention belongs to the field of building concrete additives, and particularly relates to a polycarboxylic acid water reducing agent and a method for preparing the same. The polycarboxylic acid water reducing agent comprises methoxy polyethylene glycol methacrylate, 2-methyl acrylic polyether, sulfated cyclodextrins maleic anhydride ester, acrylic acid, ammonium persulfate, sodium hydroxide and water. The polycarboxylic acid water reducing agent and the method have the advantages that the polycarboxylic acid water reducing agent is excellent in slump loss resistance and is particularly excellent in adaptability to concrete with intermediate and low flowability and high in water reducing ratio when used in high-temperature environments in summers.

Description

technical field [0001] The invention belongs to the field of building concrete admixtures, and more specifically, the invention relates to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Compared with naphthalene-based water-reducers, polycarboxylate-based water-reducers have high water-reducing rate, small slump loss, proper air-entrainment, and no use of toxic substances such as formaldehyde in the synthesis process, which is an important factor for realizing high-performance concrete. means. The polycarboxylate water reducer has a comb-shaped structure, which has low permeability, high water reducing rate, good slump retention, large degree of freedom in molecular structure design, multiple synthesis methods, and great development potential. It has become one of the research hotspots of concrete admixtures. With the development of commercial concrete, people have higher and higher requirements for the slump retention perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F299/02C08F299/00C08F283/06C08F220/06C08F251/00C04B24/16C04B103/30
CPCC08F299/026C04B24/165C04B2103/302C08F251/00C08F283/065C08F299/00C08F299/022C08F220/06
Inventor 杨海华
Owner 南通瑞特建筑材料有限公司
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