Slow-release type polycarboxylate water reducer

A slow-release polycarboxylic acid and water-reducing agent technology, applied in the chemical industry, can solve the problems of affecting construction, affecting the performance and quality of concrete, insufficient anti-adsorption capacity of admixtures, etc. Effect

Inactive Publication Date: 2016-08-17
LIUZHOU QIANGWEI FORGING PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the slump loss of freshly mixed concrete is too fast, it will not only affect the construction but also greatly affect the performance and quality of concrete
The ess

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A slow-release polycarboxylate water reducer, composed of the following raw materials in parts by weight: 100 parts of methallyl polyoxyethylene ether, 20 parts of methacrylic acid, 8 parts of polyethylene glycol, thioethanol 0.39 parts of acid, 0.38 parts of hydrogen peroxide (30%), 0.12 parts of L-ascorbic acid, 60 parts of chloroform, 0.05 parts of hydroquinone, and 0.04 parts of composite catalyst.

[0016] Its specific production process includes the following steps:

[0017] (1) Put methacrylic acid and polyethylene glycol into the flask in proportion, add chloroform as a solvent, hydroquinone as a polymerization inhibitor, and heat the rest to 120 °C under nitrogen protection and condensing reflux conditions. ℃ and mechanically stirred for 4 hours to stop the reaction;

[0018] (2) After the flask is cooled to room temperature, carry out vacuum distillation to remove the process product and solvent to obtain the esterified macromonomer mixture. Configure liquid...

Embodiment 2

[0022] 1. A slow-release polycarboxylate water reducer, consisting of the following raw materials in parts by weight: 110 parts of methallyl polyoxyethylene ether, 30 parts of methacrylic acid, 10 parts of polyethylene glycol, sulfur 0.425 parts of glycolic acid, 0.42 parts of hydrogen peroxide (30%), 0.14 parts of L-ascorbic acid, 70 parts of chloroform, 0.065 parts of hydroquinone, and 0.06 parts of composite catalyst.

[0023] Its specific production process includes the following steps:

[0024] (1) Put methacrylic acid and polyethylene glycol into the flask in proportion, add chloroform as a solvent, hydroquinone as a polymerization inhibitor, and heat the rest to 120 °C under nitrogen protection and condensing reflux conditions. ℃ and mechanically stirred for 4 hours to stop the reaction;

[0025] (2) After the flask is cooled to room temperature, carry out vacuum distillation to remove the process product and solvent to obtain the esterified macromonomer mixture. Conf...

Embodiment 3

[0029] A slow-release polycarboxylate water reducer, consisting of the following raw materials in parts by weight: 120 parts of methallyl polyoxyethylene ether, 40 parts of methacrylic acid, 12 parts of polyethylene glycol, thioethanol 0.46 parts of acid, 0.46 parts of hydrogen peroxide (30%), 0.16 parts of L-ascorbic acid, 80 parts of chloroform, 0.08 parts of hydroquinone, and 0.08 parts of composite catalyst.

[0030] Its specific production process includes the following steps:

[0031] (1) Put methacrylic acid and polyethylene glycol into the flask in proportion, add chloroform as a solvent, hydroquinone as a polymerization inhibitor, and heat the rest to 120 °C under nitrogen protection and condensing reflux conditions. ℃ and mechanically stirred for 4 hours to stop the reaction;

[0032] (2) After the flask is cooled to room temperature, carry out vacuum distillation to remove the process product and solvent to obtain the esterified macromonomer mixture. Configure liq...

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PUM

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Abstract

The invention discloses a slow-release type polycarboxylate water reducer, and belongs to the field of chemical industry. The polycarboxylate water reducer is prepared from, by weight, 100-120 parts of methyl allyl polyethenoxy ether, 20-40 parts of methacrylic acid, 8-12 parts of polyethylene glycol, 0.39-0.46 part of mercaptoacetic acid, 0.38-0.46 part of hydrogen peroxide (30%), 0.12-0.16 part of L-ascorbyl acid, 60-80 parts of trichloromethane, 0.05-0.08 part of hydroquinone and 0.04-0.08 part of composite catalyst. The slow-release type polycarboxylate water reducer is simple in process, can effectively relieve the problem of concrete slump loss, and has no adverse influences on other performance of concrete.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a slow-release polycarboxylate water reducer Background technique [0002] For the ready-mixed concrete industry, when the concrete mixture must be transported for a long time, the initial slump level should be maintained as much as possible to ensure the smooth transportation, pumping and pouring of concrete. If the slump loss of fresh concrete is too fast, it will not only affect the construction but also greatly affect the performance and quality of concrete. The essence of the problem is that the mineral fine powder material in the concrete absorbs the admixture too fast, and the admixture has insufficient anti-adsorption ability. [0003] Polycarboxylate high-efficiency water reducer has become a hot spot in the research and development of concrete admixtures due to its high water reducing rate, good slump retention performance, fast strength increase, and good appearance q...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F222/20C04B24/26C04B103/30
CPCC04B24/2647C04B2103/302C08F283/065C08F222/102
Inventor 白健
Owner LIUZHOU QIANGWEI FORGING PLANT
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