Double long branch-chain polycarboxylic acid water reducing agent and preparation process thereof

A technology of branched polycarboxylate and water reducer, which is applied in the field of double long chain branched polycarboxylate water reducer, can solve the problems of poor cement adaptability, complex production process, and low water reducing rate, and achieve slump The effect of small loss of strength, low dosage, and improvement of early and late strength

Inactive Publication Date: 2010-12-08
湖北鑫汇生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems of polycarboxylate superplasticizer production process is too complex, high cost, low water reducing rate and p

Method used

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  • Double long branch-chain polycarboxylic acid water reducing agent and preparation process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 50g of water into a 250ml four-necked flask equipped with a thermometer, a stirrer, a dropping funnel, and a condenser, and heat it to 80°C; Mixed aqueous solution of 15g monomethacrylate, 1.6g sodium 2-acrylamide-2 methylpropyl sulfonate, 13.2g methacrylic acid and 107g water, and 1.1g ammonium persulfate and 90g water solution, dropwise addition time Control at 5±0.5 hours; after the addition is completed, keep the constant temperature at 80-90°C and continue the reaction for 4 hours. After the reaction is completed, add 6.3g of 40wt% sodium hydroxide aqueous solution dropwise to neutralize to about PH=7 to obtain a polycarboxylate water reducer Product XH-1. The measurement performance indicators are shown in Table 1.

Embodiment 2

[0025] Add 50g of water into a 250ml four-neck flask equipped with a thermometer, stirrer, dropping funnel, and condenser, and heat to 80±5°C; at the same time, dropwise add 30g of methoxypolyethylene glycol methacrylate, polyethylene glycol Diol monomethacrylate 10g, 2.2g of sodium 2-acrylamide-2 methylpropyl sulfonate, methacrylic acid 12.8g and water 107g mixed aqueous solution, and ammonium persulfate 2.6g and water 90g aqueous solution, drop Adding time is controlled at 5 ± 0.5 hours; after the dropwise addition is completed, the constant temperature is continued at 80-90°C for 4 hours, and after the reaction is completed, 6.1g of 40wt% sodium hydroxide aqueous solution is added dropwise to neutralize to about PH=7, and polycarboxylic acid is obtained. Aqueous product XH-2. The measurement performance indicators are shown in Table 1.

Embodiment 3

[0027] Add 50g of water into a 250ml four-neck flask equipped with a thermometer, agitator, dropping funnel, and condenser, and heat it to 80±5°C; at the same time, add 35g of methoxypolyethylene glycol methacrylate, polyethylene glycol A mixed aqueous solution of 5 g of glycol monomethacrylate, 0.85 g of sodium 2-acrylamide-2 methylpropyl sulfonate, 15.3 g of methacrylic acid and 107 g of water, and an aqueous solution of 4.1 g of ammonium persulfate and 90 g of water, drop Adding time is controlled at 5 ± 0.5 hours; after the dropwise addition is completed, the constant temperature is kept at 80-90° C. to continue the reaction for 4 hours, and after the reaction is completed, 7.0 g of 40 wt % sodium hydroxide aqueous solution is added dropwise to neutralize to about PH=7, and polycarboxylic acid is obtained. Aqueous product XH-3. The measurement performance indicators are shown in Table 1.

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Abstract

The invention discloses a double long branch-chain polycarboxylic acid water reducing agent and a preparation process thereof. The water reducing agent is copolymerized from methoxypolyethylene glycol methyl acrylate, polyethylene glycol monomethyl acrylate, methacrylic acid and 2-acrylamide-2 methyl propyl sodium sulfonate by using ammonium persulfate as an initiator. The preparation process comprises the following steps of: dissolving the four monomers into water to form dropping solution 1, and dissolving the ammonium persulfate into water to form dropping solution 2; adding the water into four flasks provided with a thermometer, a stirrer, a dropping funnel and a condenser, and heating the water to 80 DEG C; dropping the dropping solution 1 and the dropping solution 2 into the flasks at the same time, keeping the constant temperature of between 80 and 90 DEG C after the dropping is finished, and reacting the solution for 4 to 15 hours; and after the reaction is finished, neutralizing the solution by using sodium hydroxide till the pH is 7 to 9 so as to obtain the water reducing agent solution. By substituting a part of polyether for methoxyl polyester, the branch chains in the molecular structure of the water reducing agent have high density, the two long branch chains have better synergistic steric effect, the water reducing rate of the water reducing agent is higher, the slump loss of concrete is lower and the water reducing agent has stronger adaptability to cement.

Description

technical field [0001] The invention relates to a double long-chain branched polycarboxylate water reducer and a preparation process thereof. Background technique [0002] With the development of concrete in my country in recent years, the performance of concrete in all aspects has been continuously improved, and the requirements for concrete water reducing agents are also getting higher and higher. Polycarboxylate superplasticizer is the third generation of high-performance superplasticizer, which has the advantages of low dosage, high water reducing rate, small slump loss, strong adaptability to cement, and can greatly improve the mixing capacity of fly ash and mineral powder. The amount of material used is green and environmentally friendly, and it can greatly save cement. It has the advantages of preparing high-strength and ultra-high-strength concrete. It is widely used in commodity concrete, high-strength concrete, and high-performance concrete. Concrete engineering w...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F290/06C04B103/30
CPCC04B2103/0094C04B24/165C04B2103/308C04B2103/302C04B24/166
Inventor 廖国胜李厚祥
Owner 湖北鑫汇生物科技有限公司
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