Viscosity reduction type polycarboxylate concrete admixture and preparation method thereof

A viscous polycarboxylic acid, high-performance technology, applied in the field of viscosity-reducing polycarboxylic acid high-performance water reducing agent and its preparation, can solve the problem of molecular structure hydrophilicity and hydrophobicity and viscosity reduction effect. Economic problems, complex preparation methods, etc., to achieve the effects of excellent cement adaptability, significant viscosity reduction effect, and simple process

Active Publication Date: 2017-10-20
广东瑞安科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the unsaturated modified polyoxyethylene ether macromonomer used in the synthesis process of the water reducer is formed by random copolymerization of ethylene oxide and propylene oxide, and has a relatively large molecular weight, which is very important for adjusting the hydrophilicity and

Method used

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  • Viscosity reduction type polycarboxylate concrete admixture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1.

[0023] A high-performance water-reducing agent for viscosity-reducing polycarboxylic acid, synthetic raw materials are: low molecular weight block modified unsaturated polyoxyethylene ether comonomer A, unsaturated carboxylic acid comonomer B, alkylphenol polyoxyethylene Ether C, initiator, reducing agent, chain transfer agent, liquid caustic soda and water; the mass ratio of synthetic raw materials is, unsaturated polyoxyethylene ether comonomer A: unsaturated carboxylic acid comonomer B: alkylphenol polyoxygen Vinyl ether C: initiator: reducing agent: chain transfer agent: liquid caustic soda: water is (320~420): (24~36): (3~10): (1~5): (0.5~3): ( 0.5~4): (20~50): (400~500).

[0024] Among them, the low-molecular-weight block modified unsaturated polyoxyethylene ether comonomer has a molecular chain segment of propylene oxide or butylene oxide embedded in the middle of the ethylene oxide segment to form a molecular structure. Its chemical structure is as foll...

Example Embodiment

[0031] Example 2.

[0032] Put 324.1 parts of low molecular weight block modified unsaturated polyoxyethylene ether CH with a molecular weight of 500 into a four-necked flask equipped with a stirrer and a thermometer 2 =C(CH 2 CH 3 )CH 2 O-(CH 2 CH 2 O) 2 -(CH 2 CH 2 CH 2 O) 2 -(CH 2 CH 2 O) 5 OH() and 4.8 parts of nonylphenol polyoxyethylene ether NP-4, add 250.5 parts of water, start stirring and heat up to 35℃~40℃, after the monomer in the flask is completely dissolved, add 1.2 parts of ammonium persulfate and stir for 5min After ~10min, add the solution of material I and material II at the same time, material I (a solution made by stirring 34.7 parts of acrylic acid and 40 parts of water), add 3h~4h, material II (from 2.1 parts of sodium bisulfite, 1.8 parts) Stir thioglycolic acid and 58.7 parts of water to make a solution) dropwise for 3.5h~4.5h, after dripping, continue to keep at 40℃~45℃ for 1h~2h, after the reaction, add 93.5 parts of water and cool to 30℃, add 39.2 A po...

Example Embodiment

[0033] Example 3.

[0034] Put 359.4 parts of low molecular weight block modified unsaturated polyoxyethylene ether CH with a molecular weight of 800 into a four-necked flask equipped with a stirrer and a thermometer 2 =C(CH 2 CH 3 )CH 2 O-(CH 2 CH 2 O) 3 -(CH 2 CH 2 CH 2 CH 2 O) 4 -(CH 2 CH 2 O) 7 OH and 5.7 parts of nonylphenol polyoxyethylene ether NP-10, add 254.3 parts of water, start stirring and heat up to 35℃~40℃, after the monomer in the flask is completely dissolved, add 1.9 parts of sodium persulfate and stir for 5min~10min After that, the solution of material I and material II was added dropwise at the same time, material I (a solution made by stirring 25.4 parts of acrylic acid and 30 parts of water) was added dropwise for 3h-4h, material II (composed of 1.8 parts of L-ascorbic acid, 1.6 parts of mercaptoethanol and Mix 72.4 parts of water evenly to make a solution) dropwise for 3.5h~4.5h, after dripping, continue to keep at 40℃~50℃ for 1h~2h, after the reaction, add ...

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Abstract

The invention discloses a viscosity reduction type polycarboxylate concrete admixture and a preparation method thereof. The polycarboxylate concrete admixture contains the following synthetic raw materials: low molecular weight segmented modified unsaturated polyoxyethylene ether comonomer A, an unsaturated carboxylic acid comonomer B, alkylphenol ethoxylate C, an initiator, a reducing agent, a chain transfer agent, caustic soda liquid and water, wherein the mass ratio of the synthetic raw materials is as follows: a ratio of the low molecular weight segmented modified unsaturated polyoxyethylene ether comonomer A to the unsaturated carboxylic acid comonomer B to the alkylphenol ethoxylate C to the initiator to the reducing agent to the chain transfer agent to the caustic soda liquid to the water is (320-420):(24-36):(3-10):(1-5):(0.5-3):(0.5-4):(20-50):(400-500). The viscosity reduction type polycarboxylate concrete admixture disclosed by the invention has the characteristics of excellent dispersion property, obvious viscosity reduction effect, and excellent cement adaptability, and the product is simple in process, safe, reliable and stable in performance, does not contain any chloride ion, does not have any Corrosion damage on reinforcement and is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a viscosity-reducing polycarboxylate high-performance water reducer and a preparation method thereof. Background technique [0002] With the rapid development of my country's construction industry, high-grade concrete is being more and more used in engineering construction due to its high overall strength and light weight. However, the application environment of high-grade concrete often has complex building structures and dense reinforcement, which puts forward higher requirements for the workability, fluidity, self-compacting and strength growth of high-grade concrete. [0003] At present, the strength of concrete is mainly improved by reducing the water-cement ratio and increasing the amount of cementitious materials, but these methods will increase the viscosity of the concrete and reduce the fluidity, thereby reducing the pumping performance of the concrete and a...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B103/30
CPCC04B40/0039C04B2103/302C04B24/32C04B24/04C04B2103/0096C04B2103/0068C04B22/06C04B22/002C04B22/14C04B24/16
Inventor 仲以林陆智明黄凯波符惠玲巫晓鑫
Owner 广东瑞安科技实业有限公司
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