Amphoteric polycarboxylate-type efficient water reducing agent with viscosity reduction and antibiotic properties and preparation method thereof

A high-efficiency water-reducing agent and polycarboxylic acid-based technology, applied in the field of cement admixtures, can solve the problems of limited use, high price, and limited air-entraining viscosity-reducing effect, etc., to reduce concrete viscosity, improve surface activity, and water-reducing performance Enhanced effect

Inactive Publication Date: 2019-03-01
中建西部建设西南有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of entraining air to reduce viscosity is limited and adding too much will adversely affect the strength of concrete
In terms of admixtures, at present, the work performance of concrete is mainly improved by adding silica fume, fly ash, microbeads, etc. Although the addition of the above admixtures can reduce the viscosity of concrete, it will reduce the viscosity of high-strength and ultra-high-strength concrete. The sticking effect is very limited and generally expensive, which increases the unit cost of concrete and limits its use in ready-made concrete

Method used

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  • Amphoteric polycarboxylate-type efficient water reducing agent with viscosity reduction and antibiotic properties and preparation method thereof
  • Amphoteric polycarboxylate-type efficient water reducing agent with viscosity reduction and antibiotic properties and preparation method thereof
  • Amphoteric polycarboxylate-type efficient water reducing agent with viscosity reduction and antibiotic properties and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment sets the viscosity-reducing antibacterial amphoteric polycarboxylic acid water reducer, using prenol polyoxyalkylene ether, unsaturated acid, unsaturated phosphoric acid ester, cationic monomer and antibacterial monomer as the main raw materials. It is formed by free radical polymerization under the action of chain transfer agent. The specific steps are as follows:

[0051] Preparation of cationic monomer: Dissolve 1 mol of maleic anhydride and sodium hydroxide in ethanol, stir and heat to 50°C, add 1.05 mol of urea, and after reacting for 2 hours, continue to add 1.05 mol of N,N-di to the reactor Methyl-1,2-ethylenediamine, after reacting for 3 hours, 1.1 mol of 1-chlorobutane was added and part of sodium hydroxide was added, and the temperature was raised to 50° C. and reacted for 3 hours to obtain a cationic monomer.

[0052] Preparation of antibacterial monomer: Put 1mol of guanidine hydrochloride and 1.2mol of ethylenediamine in a reactor, first react at...

Embodiment 2

[0060] This embodiment sets the viscosity-reducing antibacterial amphoteric polycarboxylic acid water reducer, using prenol polyoxyalkylene ether, unsaturated acid, unsaturated phosphoric acid ester, cationic monomer and antibacterial monomer as the main raw materials. It is formed by free radical polymerization under the action of chain transfer agent. The specific steps are as follows:

[0061] Preparation of cationic monomer: Dissolve 1 mol of maleic anhydride and sodium hydroxide in ethanol, stir and heat to 50°C, add 1.05 mol of urea, and after reacting for 2 hours, continue to add 1.06 mol of N,N-di to the reactor Methyl-1,3-propanediamine, after reacting for 3 hours, 1.15 mol of 1-chloropentane was added and a part of sodium hydroxide was added, and the temperature was raised to 50° C. to react for 3 hours to obtain a cationic monomer.

[0062] Preparation of antibacterial monomer: Place 1 mol of guanidine hydrochloride and 1.2 mol of propylene diamine in a reactor, first re...

Embodiment 3

[0070] This embodiment sets the viscosity-reducing antibacterial amphoteric polycarboxylic acid water reducer, using prenol polyoxyalkylene ether, unsaturated acid, unsaturated phosphoric acid ester, cationic monomer and antibacterial monomer as the main raw materials. It is formed by free radical polymerization under the action of chain transfer agent. The specific steps are as follows:

[0071] Preparation of cationic monomer: Dissolve 1 mol of maleic anhydride and sodium hydroxide in ethanol, stir and heat to 50°C, add 1.05 mol of urea, and after reacting for 2 hours, continue to add 1.05 mol of N,N-di to the reactor Methyl-1,4-butanediamine, after 3.5 hours of reaction, 1.15 mol of 1-chlorohexane was added, sodium hydroxide was added, and the temperature was raised to 60° C. to react for 3 hours to obtain a cationic monomer.

[0072] Preparation of antibacterial monomer: Put 1mol of guanidine hydrochloride and 1.2mol of 1,4-butanediamine in the reactor, first react at 100℃ for ...

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Abstract

The invention provides an amphoteric polycarboxylate-type efficient water reducing agent with viscosity reduction and antibiotic properties, and belongs to the technical field of concrete admixtures.The general formula of the efficient water reducing agent is shown in the description, wherein R is selected from H or CH3; R1 is selected from alkyl of four to ten carbon atoms; X is selected from Cl, Br, I halogen elements; a, b, c, d, e, f, g, h, i, n are all integers, and a, b, c, d, e are selected from 1-30; f is selected from 2-6, and g is selected from 25-80; and h is selected from 2-8, andi is selected from 10-20. The efficient water reducing agent is prepared through polymerization of raw materials including TPEG, unsaturated carboxylic acid, unsaturated phosphate, a cationic monomerand an antibiotic monomer through free radicals under the effects of an initiator and a chain transfer agent. The invention further provides a preparation method of the efficient water reducing agent. The polycarboxylate water reducing agent has the capabilities of reducing the concrete viscosity and improvethe antimildew and anti-rancid properties of a finished compound polycarboxylate water reducing agent product.

Description

Technical field [0001] The invention belongs to the technical field of cement admixtures, and specifically relates to a polycarboxylic acid-based high-efficiency water reducing agent with a viscosity-reducing antibacterial amphoteric type and a preparation method thereof. Background technique [0002] With the continuous expansion of civil engineering scale and the continuous improvement of scientific and technological level, fresh concrete has developed from dry hardness to plasticity to large fluidity, and the strength has developed from medium and low strength to medium and high strength, and the performance has also changed from ordinary to high performance. High- and ultra-high performance concrete has the characteristics of high specific strength, large load capacity, excellent durability, resource and energy conservation, and can meet the requirements of lightweight, high-rise, large span and high durability in modern buildings and infrastructure. The significant feature o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F230/02C08F220/06C08F222/38C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F230/02C08F220/06C08F222/38
Inventor 王福涛王军陈景郑广军毕耀刘明曾超兰聪刘霞傅承飞刘其彬
Owner 中建西部建设西南有限公司
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