Heat-energy-free novel integrated efficient polycarboxylic acid water reducer and preparation method therefor

A technology of high-efficiency polycarboxylate and superplasticizer, which is applied in the field of concrete admixture and high-efficiency polycarboxylate superplasticizer, can solve the problems of poor cement adaptability and high energy consumption in production, and achieve safe production process and short production time , the effect of improving performance

Inactive Publication Date: 2015-11-25
山东华强环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the biggest disadvantage of the above polycarboxylate high-efficiency water reducer is that it has poor adaptability to cement, the maximum water reducing rate is not more than 40%, and the production temperature is mostly above 50°C, so the production energy consumption is large

Method used

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  • Heat-energy-free novel integrated efficient polycarboxylic acid water reducer and preparation method therefor
  • Heat-energy-free novel integrated efficient polycarboxylic acid water reducer and preparation method therefor
  • Heat-energy-free novel integrated efficient polycarboxylic acid water reducer and preparation method therefor

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Embodiment 1

[0041] A method for preparing a new type of heat-free integrated high-efficiency polycarboxylate water reducer, comprising the following steps:

[0042] (1) Preparing the base material: first stirring and dissolving TPEG with a molecular weight of 2000-3000 and water together to form 220g of a 60wt% substrate solution;

[0043] (2) Preparation of material B: Acrylic acid and water are pre-formulated into 77wt% solution B27g;

[0044] (3) Prepare material A: the initiator ammonium persulfate is preformed into 30 g of an aqueous solution with a concentration of 0.15 wt %, and then sequentially add 0.3 g of molecular weight regulator vinyl acetate and 0.2 g of hydrogen peroxide (30 wt %) and stir evenly to obtain solution A ;

[0045](4) Add solution B and solution A dropwise to the substrate solution at the same time at 30°C±1°C, the dropping time of solution A is controlled at 1.5 hours, and the dropping time of solution B is controlled at 1.0 hour; solution A is added dropwis...

Embodiment 2

[0050] (1) Preparation of base material: First, TPEG with a molecular weight of 2000-3000 and water are stirred and dissolved to form 264g of a 50wt% substrate solution;

[0051] (2) Preparation of material B: Acrylic acid and water are pre-formulated into 70wt% solution B29.7g;

[0052] (3) Preparation of material A: the initiator ammonium persulfate is pre-formulated into 30 g of an aqueous solution with a concentration of 0.2 wt %, and then sequentially add 0.1 g of molecular weight modifier mercaptopropionic acid and 0.4 g of hydrogen peroxide (30 wt %), and stir evenly to obtain a solution A;

[0053] (4) Add solution B and solution A to the substrate solution at the same time at 25°C±1°C. The dropping time of solution A is controlled at 3.5 hours, the dropping time of solution B is controlled at 3.0 hours, and the dropping time of solution A is controlled at 3.0 hours. Finished keeping warm for 0.5 hours. After the heat preservation is completed, add water and stir eve...

Embodiment 3

[0055] (1) Preparing the base material: first stirring and dissolving TPEG with a molecular weight of 2000-3000 and water together to form 240g of a 55wt% substrate solution;

[0056] (2) Preparation of material B: Acrylic acid and water are pre-formulated into 80wt% solution B26g;

[0057] (3) Preparation of material A: the initiator ammonium persulfate is preformed into 30 g of an aqueous solution with a concentration of 0.18 wt %, and then sequentially add 0.5 g of molecular weight modifier sodium methacrylate sulfonate and 0.15 g of hydrogen peroxide (30 wt %), and stir evenly , to get solution A;

[0058] (4) Add solution B and solution A dropwise to the bottom material at 20°C±1°C at the same time. The time for adding solution A is controlled at 3.5 hours, the time for adding solution B is controlled at 3.0 hours, and the time for adding solution A is controlled at 3.0 hours. After completion, keep warm for 1.5 hours. After the heat preservation is completed, add water...

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Abstract

The invention relates to a heat-energy-free novel integrated efficient polycarboxylic acid water reducer and a preparation method therefor. The water reducer is obtained by polymerizing a polymerizable organic acid small monomer with a carboxylic acid group and a polymerizable polyether TPEG large monomer with a long chain at normal temperature. The water reducer is simple in reaction, free of heat energy consumption, short in reaction time and safe and pollution-free in production process. The water reducing rate can reach 45-50%. By adopting he water reducer, the doping amount of mineral admixtures in concrete can be properly improved, the cost of building materials is lowered, and the performance of concrete is improved. The water reducer is small in doping amount, strong in anti-clay ability and high in comprehensive cost performance, and is widely applied to preparing concrete with super-durability.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a high-efficiency polycarboxylate water reducer synthesized at room temperature, and belongs to the technical field of water reducers. Background technique [0002] Polycarboxylate comb-shaped polymer admixture is a new generation of polycarboxylate superplasticizer (PCE) developed by Japan and the United States since the 1980s. Its structure is characterized by a comb-shaped grafted long-chain macromolecular structure. With dense carboxylic acid groups, the branched chain of the molecule is a non-ionic polyethylene glycol chain. The molecule uses the hydrophilic long side chain to provide steric hindrance and the dense carboxylic acid groups on the main chain and the cement particles. The "anchor" effect of the product produces high water reduction, low dosage, and high slump performance, which has gradually been widely recognized by the concrete industry. For the preparation of high-stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F2/38C08F4/30C04B24/26C04B103/30
Inventor 马永峰郭树杰卢国明
Owner 山东华强环保科技有限公司
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