A low-air-entraining viscosity-reducing polycarboxylate water reducer and its preparation method

A technology of viscous polycarboxylic acid and water reducing agent, applied in the field of building material admixtures, can solve the problems of complex synthesis process, high price of reaction raw materials, unfavorable production and application, etc. gaseous effect

Active Publication Date: 2018-12-28
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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  • A low-air-entraining viscosity-reducing polycarboxylate water reducer and its preparation method
  • A low-air-entraining viscosity-reducing polycarboxylate water reducer and its preparation method
  • A low-air-entraining viscosity-reducing polycarboxylate water reducer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A low-air-entraining and viscosity-reducing polycarboxylic acid water reducer, which uses alkyl phosphate triester mixture, prenol polyoxyethylene ether, unsaturated carboxylic acid as main raw materials, and acts as initiator and chain transfer agent. Next, it is formed by free radical polymerization, the specific steps are as follows:

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

[0047] 2) Preparation of low air-entraining and viscosity-reducing polycarboxylic acid water reducer:

[0048] Weigh 200g (85.11%) of prenol polyoxyethylene ether mon...

Embodiment 2

[0054] A low-air-entraining and viscosity-reducing polycarboxylic acid water reducer, which uses alkyl phosphate triester mixture, prenol polyoxyethylene ether, unsaturated carboxylic acid as main raw materials, and acts as initiator and chain transfer agent. Next, it is formed by free radical polymerization, the specific steps are as follows:

[0055] 1) The preparation of the alkyl phosphate triester mixture is the same as in Example 1;

[0056] 2) Preparation of low air-entraining and viscosity-reducing polycarboxylic acid water reducer:

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

[0058] Weigh 24g (10%) alkyl phosphate triester mixture, 16g (6.7%) acrylic acid, 0.048g chain transfer agent, 0.72 sodium hydrosulfide and dissolve in 30g deionized water to obtain mixed solution B;

[0059] Dissolve 3.6 g of ammon...

Embodiment 3

[0063] A low-air-entraining and viscosity-reducing polycarboxylic acid water reducer, which uses alkyl phosphate triester mixture, prenol polyoxyethylene ether, unsaturated carboxylic acid as main raw materials, and acts as initiator and chain transfer agent. Next, it is formed by free radical polymerization, the specific steps are as follows:

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

[0065] 2) Preparation of low air-entraining and viscosity-reducing polycarboxylic acid water reducer:

[0066] Weigh 200g (84%) prenol polyoxyethylene ether monomer (molecular weight 3000) and dissolve it in 100g...

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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, and in particular relates to a low air-entraining and viscosity-reducing type polycarboxylic acid 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. Pumping concrete for super high-rise buildings not only meets the requirements of strength, durability, and workability specified in concrete design, but also meets the requirements of pipeline transportation for concrete. Because the pipeline load pressure of concrete is directly related to the fluidity of concrete workability, when the concrete yield stress and plastic viscosity 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, visco...

Claims

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Application Information

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Patent Type & Authority Patents(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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