Polycarboxylic water reducer with viscosity reducing and slump retaining functions, and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of concrete admixtures, can solve the problems of high reaction temperature, low temperature, difficult production control, etc., and achieve the effect of simple production equipment, reasonable process and good performance

Inactive Publication Date: 2018-12-18
SICHUAN TONGZHOU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention introduces and controls a certain amount of hydrophobic units and hydrophobic groups in the molecular structure of the carboxylic acid copolymer to reduce the viscosity of cement-based materials under the action of the water reducer, but the reaction temperature of this method is 50-70 °C, The reaction temperature is high, and the production is difficult to control

Method used

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  • Polycarboxylic water reducer with viscosity reducing and slump retaining functions, and preparation method thereof
  • Polycarboxylic water reducer with viscosity reducing and slump retaining functions, and preparation method thereof
  • Polycarboxylic water reducer with viscosity reducing and slump retaining functions, and preparation method thereof

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Effect test

Embodiment 1

[0032]This embodiment provides a polycarboxylic acid-based water-reducing agent with both viscosity reduction and slump retention functions. 465g of deionized water is prepared by polymerization, wherein the total amount of the two unsaturated polyether monomers, the amount of unsaturated carboxylic acid monomers, the amount of unsaturated carboxylic acid alkyl esters and the amount of unsaturated phosphate esters The ratio of the amount of monomer-like substances is: 1.0:3.45:0.28:0.82, the amount of chain transfer agent is 0.52% of the total mass of unsaturated polyether monomer, and the amount of oxidant is 1.2% of the total mass of unsaturated polyether monomer %, and the amount of the reducing agent is 0.2% of the total mass of the unsaturated polyether monomer.

[0033] The concrete preparation method of the above-mentioned polycarboxylic acid-based water reducing agent with both viscosity reduction and slump retention functions is as follows:

[0034] ①Add 120g isobute...

Embodiment 2

[0039] This embodiment provides a polycarboxylic acid-based water-reducing agent with both viscosity-reducing and slump-preserving functions. The water-reducing agent consists of 370.7 g of a comonomer, 4.0 g of an oxidizing agent, 0.65 g of a reducing agent, 1.56 g of a chain transfer agent and 465g of deionized water is prepared by polymerization, wherein the total amount of the two unsaturated polyether monomers, the amount of unsaturated carboxylic acid monomers, the amount of unsaturated carboxylic acid alkyl esters and the amount of unsaturated phosphate esters The ratio of the amount of monomer-like substances is: 1.0:3.2:0.31:0.52, the amount of chain transfer agent is 0.64% of the total mass of unsaturated polyether monomer, and the amount of oxidant is 1.33% of the total mass of unsaturated polyether monomer %, and the amount of the reducing agent is 0.22% of the total mass of the unsaturated polyether monomer.

[0040] The concrete preparation method of the above-me...

Embodiment 3

[0046] This embodiment provides a polycarboxylic acid-based water reducing agent with both viscosity reduction and slump retention functions. 470g of deionized water is prepared by polymerization, wherein the total amount of the two unsaturated polyether monomers, the amount of unsaturated carboxylic acid monomers, the amount of unsaturated carboxylic acid alkyl esters and the amount of unsaturated phosphates The ratio of the amount of monomer-like substances is: 1.0:3.22:0.27:0.58, the amount of chain transfer agent is 0.53% of the total mass of unsaturated polyether monomer, and the amount of oxidant is 1.4% of the total mass of unsaturated polyether monomer %, and the amount of the reducing agent is 0.4% of the total mass of the unsaturated polyether monomer.

[0047] The concrete preparation method of the above-mentioned polycarboxylic acid-based water reducing agent with both viscosity reduction and slump retention functions is as follows:

[0048] ①Add 200g isobutenol p...

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Abstract

The invention discloses a polycarboxylic water reducer with viscosity reducing and slump retaining functions, and a preparation method thereof, and belongs to the technical field of building materials. The polycarboxylic water reducer is prepared through the following steps: free radical polymerization of an unsaturated polyether monomer I, an unsaturated block modified polyether monomer II, an unsaturated carboxylic acid monomer, an unsaturated carboxylic acid alkyl ester, an unsaturated phosphate ester monomer, a chain transfer agent, an oxidant, a reducing agent and deionized water in an aqueous solution at 15-30 DEG C, addition of an alkali solution to adjust the pH value, and water supplementation. The water reducer can meet the requirements of the water-reducing and slump-retaining performances of high-strength concrete, and also can greatly reduce the viscosity of the concrete and significantly improve the working performances of the high-strength concrete, so the problems of fast slump loss and excessive viscosity of existing polycarboxylic water reducers are solved. The preparation method can be carried out at normal temperature without a heat source, so the preparation method has the advantages of simple production device, reasonable process, simplicity in operation, high production efficiency, and suitableness for industrial production and promotion.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a polycarboxylic acid-based water-reducing agent with both viscosity-reducing and slump-preserving functions and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy and the improvement of construction level, the requirements for concrete quality are getting higher and higher. Polycarboxylic acid-based high-performance water-reducing admixture is a new generation of building water-reducing admixture that has appeared and applied in my country in recent years. Adapted to the development of high-performance concrete, it has been widely used in real estate construction, highways, railways, bridges, water conservancy and hydropower and other engineering fields. [0003] With the development of concrete technology, concrete is gradually moving towards the direction of high strength and ultra-high strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/06C08F222/02C08F220/14C08F220/18C08F230/02C04B24/26C04B103/30
CPCC04B24/2694C08F283/065C04B2103/302C08F220/1803C08F220/1802C08F220/1804
Inventor 万甜明舒豆豆罗率何年杨志飞
Owner SICHUAN TONGZHOU CHEM TECH
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