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Low air-entraining viscosity reducing polycarboxylic water reducer and preparation method thereof

A technology of viscous polycarboxylic acid and water reducer, which is applied in the field of building material admixtures, can solve problems such as unfavorable production and application, high price of reaction raw materials, and complicated synthesis process, so as to reduce air entrainment, increase thickness, and improve The effect of reactivity

Active Publication Date: 2017-06-23
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of polycarboxylate water reducer is in the stage of laboratory preparation, and there are disadvantages such as high price of reaction raw materials, complicated synthesis process, and large use of toxic organic solvents, which is not conducive to large-scale production and application.

Method used

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  • Low air-entraining viscosity reducing polycarboxylic water reducer and preparation method thereof
  • Low air-entraining viscosity reducing polycarboxylic water reducer and preparation method thereof
  • Low air-entraining viscosity reducing polycarboxylic water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A low-air-entraining and viscosity-reducing polycarboxylate superplasticizer, which uses alkyl phosphate triester mixture, isopentenol polyoxyethylene ether, and unsaturated carboxylic acid as the main raw materials, plays the role of initiator and chain transfer agent Next, it is formed by free radical polymerization, and the specific steps are as follows:

[0046] 1) Preparation of alkyl phosphate triester mixture: put 1 mol of phosphorus pentoxide in the reactor, slowly add 1 mol of n-butanol dropwise, react at 20-30°C for 2 hours; continue to add 2.0 g polymerization inhibitor hydroquinone, then slowly add 2.1mol prenyl alcohol dropwise, and after the addition of prenyl alcohol is completed, the temperature is raised to 60°C, and the mixture is kept for three hours to obtain the mixture of alkyl phosphate triesters;

[0047] 2) Preparation of low-air-entraining and viscosity-reducing polycarboxylate superplasticizer:

[0048] Weigh 200g (85.11%) of isopentenol poly...

Embodiment 2

[0054] A low-air-entraining and viscosity-reducing polycarboxylate superplasticizer, which uses alkyl phosphate triester mixture, isopentenol polyoxyethylene ether, and unsaturated carboxylic acid as the main raw materials, plays the role of initiator and chain transfer agent Next, it is formed by free radical polymerization, and the specific steps are as follows:

[0055] 1) the preparation of alkyl phosphate triester mixture is with embodiment 1;

[0056] 2) Preparation of low-air-entraining and viscosity-reducing polycarboxylate superplasticizer:

[0057] Weigh 200g (83.3%) of isopentenol polyoxyethylene ether monomer (molecular weight 2400) and dissolve it in 100g of deionized water, pass through nitrogen to exhaust the air, heat up to 40°C and keep it warm to obtain solution A;

[0058] Weigh 24g (10%) of alkyl phosphate triester mixture, 16g (6.7%) of acrylic acid, 0.048g of chain transfer agent, and 0.72g of sodium hydrosulfide and dissolve them in 30g of deionized wat...

Embodiment 3

[0063] A low-air-entraining and viscosity-reducing polycarboxylate superplasticizer, which uses alkyl phosphate triester mixture, isopentenol polyoxyethylene ether, and unsaturated carboxylic acid as the main raw materials, plays the role of initiator and chain transfer agent Next, it is formed by free radical polymerization, and the specific steps are as follows:

[0064] 1) Preparation of alkyl phosphate triester mixture: put 1 mol of phosphorus pentoxide in the reactor, slowly add 1 mol of n-amyl alcohol dropwise, react at 20-30°C for 2 hours; continue to add 2.0 g polymerization inhibitor, then slowly add 2.3mol prenyl alcohol dropwise, after the prenyl alcohol dropwise is completed, the temperature is raised to 60°C, and the mixture is incubated for three hours to obtain the alkyl phosphate triester mixture;

[0065] 2) Preparation of low-air-entraining and viscosity-reducing polycarboxylate superplasticizer:

[0066] Weigh 200g (84%) of isopentenol polyoxyethylene ether...

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Abstract

The invention discloses a low air-entraining viscosity reducing polycarboxylic water reducer which is formed by free radical polymerization of an alkyl phosphotriester mixture, TPEG and unsaturated carboxylic acid under the action of an initiator and a chain transfer agent. By introducing an alkyl phosphotriester monomer containing two double bonds to a main chain, molecules of the obtained polycarboxylic water reducer are of heterocyclic multibranched structures, so that the thickness of a polycarboxylic water reducer adsorption layer is increased, the plastic viscosity of concrete can be remarkably reduced, and meanwhile, by introducing the phosphotriester structure into the molecules of the polycarboxylic water reducer, the foaming property of the obtained polycarboxylic water reducer can be effectively improved and the air entraining property thereof can be reduced. The low air-entraining viscosity reducing polycarboxylic water reducer prepared by the invention is low in dosage and high in water reducer rate, the air entraining property of the low air-entraining viscosity reducing polycarboxylic water reducer can be reduced, the strength and durability of the concrete are improved while the viscosity of high grade concrete is remarkably reduced, and the raw materials are low in cost, the reaction condition is mild, and the low air-entraining viscosity reducing polycarboxylic water reducer is suitable for being popularized and applied.

Description

technical field [0001] The invention belongs to the technical field of building material admixtures, in particular to a low-air-entraining and viscosity-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] The development of modern super high-rise buildings is inseparable from the improvement of concrete technology. Super high-rise pumped concrete not only meets the strength, durability, and workability requirements specified in the concrete design, but also meets the requirements of pipeline transportation for concrete. Since the pipeline load pressure of concrete is directly related to the fluidity in concrete workability, when the yield stress and plastic viscosity of concrete increase, the pressure of the concrete pumping hydraulic system also increases. This requires super high-rise pumped concrete to have lower yield stress and plastic viscosity. [0003] Concrete mixture is a complex, viscous multiphase system compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F230/02C08F220/06C04B24/26C04B103/30
CPCC04B24/246C04B2103/302C08F283/065C08F230/02C08F220/06
Inventor 王少峰赵日煦毕耀杨文郑广军李兴熊龙汪金文刑菊香
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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