Preparation method of auxiliary water reducing agent for cement-based building material

A water-reducing agent and infrastructure technology, applied in the field of building admixtures, can solve the problems of by-products affecting performance and harsh preparation conditions

Active Publication Date: 2021-06-08
厦门路桥翔通建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has a certain auxiliary water-reducing effect, its preparation conditions are relatively harsh (strong oxidizing agent, high temperature, etc.), and by-products are prone to affect performance

Method used

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  • Preparation method of auxiliary water reducing agent for cement-based building material
  • Preparation method of auxiliary water reducing agent for cement-based building material
  • Preparation method of auxiliary water reducing agent for cement-based building material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 100g of TPEG (number average molecular weight 2300-2500), 5.4g of acrylic acid and deionized water were added to the reactor. Under continuous stirring, the temperature of the reactor was raised to 60±5°C. When the reaction kettle is stabilized at 60±5°C, add 1.8 g of potassium persulfate at one time under continuous stirring. Then, the reaction kettle was kept warm at 60±5°C, and a deionized aqueous solution containing 0.9 g of ammonium persulfate was added dropwise, and the drop was completed within 1 to 2 hours. After dropping, keep warm at 60±5°C for 1-2h. Finally, after cooling down to 50°C, liquid caustic soda was added into the reaction kettle, and the final pH was adjusted to 5-6 to obtain auxiliary water reducer for cement-based building materials. Record the sample as S-1.

[0026] Purify S-1, and then characterize the S1 sample with a Nicholas Fourier transform infrared spectrometer IS5, the spectrum is as follows figure 1 shown. figure 1 1109cm in the in...

Embodiment 2

[0028] 100g of TPEG (number average molecular weight 2300-2500), 2.7g of acrylic acid and deionized water were added to the reactor. Under continuous stirring, the temperature of the reactor was raised to 60±5°C. When the reaction kettle is stabilized at 60±5°C, add 0.9 g of ammonium persulfate at one time under continuous stirring. Then, the reaction kettle was kept warm at 60±5°C, and a deionized aqueous solution containing 0.45 g of ammonium persulfate was added dropwise, and the drop was completed within 2 to 3 hours. After dropping, keep warm at 60±5°C for 1-2h. Finally, after cooling down to 50°C, liquid caustic soda was added to the reaction kettle, and the final pH was adjusted to 5-6 to obtain cement-based building material auxiliary water reducer, and the recorded sample was S-2.

Embodiment 3

[0030] 100 g of TPEG (number average molecular weight 2300-2500), 3.6 g of acrylic acid and deionized water were added to the reactor. Under continuous stirring, the temperature of the reactor was raised to 60±5°C. When the reaction kettle is stabilized at 60±5°C, add 0.63 g of potassium persulfate at one time under continuous stirring. Then, the reaction kettle was kept warm at 60±5°C, and the deionized aqueous solution containing 0.27g VC was added dropwise, and the drop was completed within 3 to 4 hours. After dropping, keep warm at 60±5°C for 1-2h. Finally, after cooling down to 50°C, liquid caustic soda was added to the reaction kettle, and the final pH was adjusted to 5-6 to obtain cement-based building material auxiliary water reducer, and the recorded sample was S-3.

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Abstract

The invention discloses a preparation method of an auxiliary water reducing agent for a cement-based building material. The method comprises the following steps: (1) mixing TPEG with the number-average molecular weight of 2300-2500, unsaturated carboxylic acid and deionized water, and heating to 55-65 DEG C while stirring; (2) adding an initiator which is potassium persulfate and/or ammonium persulfate into the material obtained in the step (1), and carrying out heat preservation reaction at 55-65 DEG C; and (3) cooling the material prepared in the step (2) to 45-50 DEG C, and adjusting the pH value to 5-6 with liquid caustic soda to obtain the product. Through molecular structure design, the high-performance auxiliary water reducing agent for the cement-based building material is directly synthesized by adopting free radical polymerization, and can directly replace part of high-water-reducing polycarboxylic acid water reducing agent mother liquor, so that the effects of reducing the total material amount, reducing the cost, saving energy and reducing emission are achieved.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of an auxiliary water reducer for cement-based building materials. Background technique [0002] With the country's increased investment in people's infrastructure and well-being and stimulating domestic demand, the concrete superplasticizer industry has great potential for development. Among the superplasticizers, the polycarboxylate high-performance superplasticizer has the highest output. In 2017, the output of polycarboxylate high-performance superplasticizers was 7.2353 million tons, accounting for about 77.63% of the total production of superplasticizers, and the total output value exceeded 10 billion. It is of great practical significance to use economical and cheap materials to prepare functional additives to replace polycarboxylate superplasticizers. [0003] CN108033705A discloses a compound or salt as an auxiliary water red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B103/30
CPCC08F283/065C04B24/2605C04B2103/302C08F220/06Y02W30/91
Inventor 黄永毅余燕华郭鹏飞
Owner 厦门路桥翔通建材科技有限公司
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