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A kind of production method of polycarboxylate high-performance water reducing agent for concrete pipe pile

A technology for a concrete pipe pile and a production method, which is applied to sheet pile walls, foundation structure engineering, construction, etc., can solve problems such as poor slump retention, improve stability, improve compressive strength retention of pipe piles, eliminate The effect of steam curing

Active Publication Date: 2020-05-01
天津市科冠达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of poor slump retention in the prior art, the present invention provides a new type of polycarboxylate water reducer with high slump retention by improving the raw material type and proportioning method of the water reducer, specifically The solution is:

Method used

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  • A kind of production method of polycarboxylate high-performance water reducing agent for concrete pipe pile

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Effect test

Embodiment 1

[0014] A production method of a novel polycarboxylate high-performance water reducer for concrete pipe piles, the production method of the water reducer comprises the following steps:

[0015] a. Heat clear water to 65°C, dissolve monomethoxypolyethylene glycol methacrylate, chitosan, and ammonium persulfate in water respectively, and the monomethoxypolyethylene glycol methacrylate and shell The weight ratio of polysaccharides is 1:1~2:1, the molar weight of ammonium persulfate accounts for 5% of the total molar weight of all monomers, and is added dropwise at a constant speed at the same time, and the dropwise addition is completed within 1.5 hours;

[0016] b. React at constant temperature for 3 hours, cool to room temperature after the reaction, and neutralize to weak alkalinity with 1 mol / L sodium hydroxide solution;

[0017] c. Distill the solution under reduced pressure to remove most of the water, and use solvent extraction to obtain the product, or directly remove all ...

Embodiment 2

[0019] A production method of a novel polycarboxylate high-performance water reducer for concrete pipe piles The production method of the water reducer includes the following steps:

[0020] a. Heat clear water to 80°C, dissolve monomethoxypolyethylene glycol methacrylate, sodium carboxymethylcellulose, acrylic acid, and ammonium persulfate in water respectively, and the monomethoxypolyethylene glycol methyl Acrylic acid ester, carboxymethyl cellulose sodium and acrylic acid weight ratio are 10:1:20, and the molar weight of ammonium persulfate accounts for 3% of the total molar weight of all monomers, and is added dropwise at a constant speed at the same time, and the dropwise addition is completed within 1 hour. ;

[0021] b. React at constant temperature for 3 hours, cool to room temperature after the reaction, and neutralize to weak alkalinity with 1 mol / L sodium hydroxide solution;

[0022] c. Distill the solution under reduced pressure to remove most of the water, and us...

Embodiment 3

[0024] A production method of a novel polycarboxylate high-performance water reducer for concrete pipe piles, the production method of the water reducer comprises the following steps:

[0025] a. Heat clear water to 90°C, dissolve monomethoxypolyethylene glycol methacrylate, acrylic acid, β-cyclodextrin, and ammonium persulfate in water respectively, and the monomethoxypolyethylene glycol methyl The weight ratio of acrylate, acrylic acid and β-cyclodextrin is 10:1:10, the molar weight of ammonium persulfate accounts for 3% of the total molar weight of all monomers, and is added dropwise at a constant speed at the same time, and the dropwise addition is completed within 1 hour;

[0026] b. React at constant temperature for 3 hours, cool to room temperature after the reaction, and neutralize to weak alkalinity with 1 mol / L sodium hydroxide solution;

[0027] c. Distill the solution under reduced pressure to remove most of the water, and use solvent extraction to obtain the produ...

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Abstract

The invention discloses a production method of a novel high-performance polycarboxylate water reducer for a concrete pipe pile. The novel high-performance polycarboxylate water reducer is prepared through the following steps: mono-methoxy polyethylene glycol methacrylate is taken as a main synthesis monomer of the water reducer, a polymerization macromonomer is added at the constant temperature of65-90 DEG C, the molar weight of an ammonium persulfate initiator is 3%-5% of the total molar weight of all the monomers, a reaction is performed for 0.5-6 h, and after the reaction, a product is obtained by distillation for water removal. The prepared water reducer has high content of hydrophilic long chains, can promote reactivity, improves slump retention performance and has an obvious improvement effect on compressive strength retentivity of pipe pile concrete.

Description

technical field [0001] The invention relates to a production method of a novel polycarboxylate high-performance water-reducer applied to steam-free curing concrete pipe piles, and belongs to the technical field of cement water-reducers. Background technique [0002] Pipe piles are widely used in road and bridge construction. When preparing pipe pile concrete, it is necessary to add water reducer to the cement raw materials. At present, polycarboxylate superplasticizers commonly used in engineering generally use acrylic acid and acrylic esters as the main synthetic raw materials, which can greatly increase the water reducing rate, but will affect the slump retention performance and mixing performance of pipe pile concrete There are negative effects. At the same time, due to the high water-reducing rate of this water-reducing agent, it is easy to cause the bottoming phenomenon when the pipe pile is pumped, and the slump retention cannot be guaranteed. It is necessary to add a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F290/06C04B24/38E02D5/58C04B103/30
Inventor 原衷旭刘彪鹏杜欣
Owner 天津市科冠达科技有限公司
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