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Viscosity-reducing type polycarboxylic acid water reducing agent for high-strength concrete and preparation method of viscosity-reducing type polycarboxylic acid water reducing agent

A viscous polycarboxylate and high-strength concrete technology, which is applied in the field of water reducing agent, can solve the problems of concrete viscosity increase, achieve the effect of improving water retention, improving workability, and helping to reduce viscosity

Active Publication Date: 2019-03-15
湖北西建新材料科技有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional ordinary polycarboxylate superplasticizer has a high water-reducing rate and can disperse cement particles to a certain extent, its large number of polar adsorption groups will cause strong interaction between the adsorption interfaces. increasing the viscosity of concrete

Method used

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  • Viscosity-reducing type polycarboxylic acid water reducing agent for high-strength concrete and preparation method of viscosity-reducing type polycarboxylic acid water reducing agent
  • Viscosity-reducing type polycarboxylic acid water reducing agent for high-strength concrete and preparation method of viscosity-reducing type polycarboxylic acid water reducing agent
  • Viscosity-reducing type polycarboxylic acid water reducing agent for high-strength concrete and preparation method of viscosity-reducing type polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The viscosity-reducing polycarboxylate superplasticizer for high-strength concrete in this example uses maleic anhydride modified phosphate, unsaturated carboxylic acid and isopentenol polyoxyethylene ether as the main raw materials, and acts as an initiator and a chain transfer agent. , formed by free radical polymerization. Specific steps are as follows:

[0035](1) Preparation of maleic anhydride-modified phosphate ester: 0.1mol of polyethylene glycol with a molecular weight of 400 is placed in a reaction vessel, and 0.1mol of maleic anhydride and 0.3% of the total mass of raw materials are added at one time under stirring conditions. The p-toluenesulfonic acid was stirred and reacted at 55°C for 3h. Then add 0.02mol of P in batches within 20min 2 o 5 , and continued stirring at 70°C for 2h. Continue to add 0.04 mol of ethylene glycol dropwise within 30 minutes, and keep the temperature for 1 hour under stirring condition to prepare maleic anhydride-modified phos...

Embodiment 2

[0041] The viscosity-reducing polycarboxylate superplasticizer for high-strength concrete in this example uses maleic anhydride modified phosphate, unsaturated carboxylic acid and isopentenol polyoxyethylene ether as the main raw materials, and acts as an initiator and a chain transfer agent. , formed by free radical polymerization. Specific steps are as follows:

[0042] (1) The preparation of maleic anhydride modified phosphoric acid ester is the same as in Example 1.

[0043] (2) Preparation of viscosity-reducing polycarboxylate water reducer: Weigh 10g (4.4%) of maleic anhydride modified phosphate, 200g (87.7%) of isopentenol polyoxyethylene ether with a molecular weight of 2400 and 150g Add water into a reaction vessel that excludes air, stir and dissolve at room temperature, and use it as a base material. 15g (6.6%) methacrylic acid and 17.5g water are formulated into material A, 0.7g (0.3%) mercaptoethanol, 0.25g vitamin C (0.1%) and 15g water are formulated into mate...

Embodiment 3

[0048] The viscosity-reducing polycarboxylate superplasticizer for high-strength concrete in this example uses maleic anhydride modified phosphate, unsaturated carboxylic acid and isopentenol polyoxyethylene ether as the main raw materials, and acts as an initiator and a chain transfer agent. , formed by free radical polymerization. Specific steps are as follows:

[0049] (1) Preparation of maleic anhydride-modified phosphate ester: put 0.1 mol of polypropylene glycol with a molecular weight of 1000 in a reaction vessel, heat up to 50°C to fully dissolve, and add 0.1 mol of maleic anhydride at one time under stirring conditions and concentrated sulfuric acid with a mass percentage of 0.2%, stirred and reacted at 60° C. for 2.5 h. Then add 0.03mol of P in batches within 30min 2 o 5 , and continued stirring at 70°C for 2.5h. Continue to add 0.06 mol of diethanolamine dropwise within 25 minutes, and keep the temperature for 1.5 hours under the condition of stirring, so as to ...

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Abstract

The invention provides a viscosity-reducing type polycarboxylic acid water reducing agent for high-strength concrete, and belongs to the technical field of water reducing agents. The viscosity-reducing type polycarboxylic acid water reducing agent has the following general formula as shown in the description, wherein R' is selected from CH3 or H; R1 is selected from CH2CH2 or CH3CHCH2; R2 is small-molecule alcohol or alcohol amine with a hydroxyl group; a, b, c, m, n and g are all integers; a, b and c are taken from 1 to 50; m is taken from 5 to 150; n is taken from 20 to 110; and g is taken from 1 to 12. According to the viscosity-reducing type polycarboxylic acid water reducing agent for high-strength concrete, maleic anhydride, polyethylene glycol or polypropylene glycol, the small-molecule alcohol or alcohol amine and a phosphorylating reagent are adopted to prepare maleic anhydride modified phosphate ester for polycarboxylic acid water reducing agent synthesis, so that a phosphategroup of a specific structure is introduced into a molecular structure of the polycarboxylic acid to increase the polymer adsorption capacity and lower an LHB value; an effect of reducing the viscosity of the concrete is achieved by improving the capacity of a surfactant of the water reducing agent and weakening the interactivity between adsorption interfaces. Meanwhile, a functional monomer preparation process can be simplified and the production cycle can be shortened; and no expensive monomers are needed, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of water reducers, in particular to a high-strength concrete viscosity-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the further deepening of my country's modernization, the high-rise, light weight, large collapse and complex structure of modern buildings and engineering facilities have become an inevitable trend in the development of the construction industry under the new situation. High-strength or even ultra-high-strength concrete has been widely used due to its high overall strength and light weight. However, its high glue material and low water-binder ratio lead to the problems of high viscosity and slow flow of fresh concrete. [0003] At present, the commonly used methods to reduce the viscosity of high-strength concrete mainly focus on three aspects: increasing the amount of water reducing agent, using high-quality mineral admixture powd...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C04B24/24C08F230/02C04B103/30
CPCC04B24/246C04B2103/302C08F230/02C08F283/065C08F220/06
Inventor 曾超王军陈景郑广军毕耀刘明王福涛兰聪刘霞罗杰傅承飞刘其彬
Owner 湖北西建新材料科技有限公司
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