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Low air-entraining type maleic anhydride poly carboxylic acid water reducing agent and preparation method thereof

A technology of maleic anhydride and polycarboxylic acid, which is applied in the field of concrete admixtures, can solve the problems of large air-entraining volume, high concrete viscosity, poor concrete appearance, etc., and achieve easy industrialization, high viscosity and simple preparation process Effect

Active Publication Date: 2017-04-26
福建路桥翔通建材科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of ordinary polycarboxylate superplasticizers, such as large air-entraining volume, high-grade concrete viscosity, and poor appearance of concrete due to difficulty in venting, the present invention provides a low-air-entraining maleic anhydride-based polycarboxylate superplasticizer. Water agent and its preparation method. The low-air-entraining maleic anhydride polycarboxylate water-reducer synthesized by this method has low air-entrainment and viscosity-reducing effects in high-grade concrete, so that the concrete has easy density and Good exhaust capacity, can get fair-faced concrete with good appearance effect

Method used

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  • Low air-entraining type maleic anhydride poly carboxylic acid water reducing agent and preparation method thereof
  • Low air-entraining type maleic anhydride poly carboxylic acid water reducing agent and preparation method thereof
  • Low air-entraining type maleic anhydride poly carboxylic acid water reducing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: The preparation method of low air-entraining type maleic anhydride polycarboxylate water reducer

[0026] Add 200 parts of TPEG, 15 parts of maleic anhydride and 284 parts of deionized water into the reactor, stir at room temperature until completely dissolved, add 1.9 parts of hydrogen peroxide at one time, stir for 5 minutes, and then dropwise add 2 parts of N - A mixed solution of vinylpyrrolidone, 2.75 parts of methyl methacrylate, 0.85 parts of octanol and 36 parts of deionized water, and a mixed solution of 0.2 parts of vitamin C, 1.0 parts of mercaptopropionic acid and 40 parts of deionized water , the dropping time is 2.5-3.5 hours, continue to react for 1-2 hours after dropping, and then adjust the pH to 6-7 with liquid caustic soda to obtain low air-entraining maleic anhydride polycarboxylate superplasticizer, record the sample for M-1.

[0027] Deionized water was added three times; the deionized water added to the reactor for the first time wa...

Embodiment 2

[0028] Embodiment 2: the preparation method of low air-entraining type maleic anhydride polycarboxylate water reducer

[0029] Add 200 parts of TPEG, 18 parts of maleic anhydride and 270 parts of deionized water into the reactor, stir at room temperature until completely dissolved, add 2.45 parts of ammonium persulfate at one time, stir for 5 minutes, and then dropwise add 1.5 parts of A mixed solution of N-vinyl caprolactam, 2 parts of butyl acrylate, 0.5 parts of lauryl alcohol and 35 parts of deionized water, and a mixed solution of 0.31 parts of saffron, 0.5 parts of thioglycolic acid and 40 parts of deionized water , the dropping time is 2.5-3.5 hours, continue to react for 1-2 hours after dropping, and then adjust the pH to 6-7 with liquid caustic soda to obtain low air-entraining maleic anhydride polycarboxylate superplasticizer, record the sample for M-2.

Embodiment 3

[0030] Embodiment 3: the preparation method of low air-entraining type maleic anhydride polycarboxylate water reducer

[0031] Add 200 parts of TPEG, 22 parts of maleic anhydride and 280 parts of deionized water into the reactor, stir at room temperature until completely dissolved, add 3 parts of potassium persulfate at one time, stir for 5 minutes, and then dropwise add 2.5 A mixed solution of N-vinyl caprolactam, 3.5 parts of methyl methacrylate, 1.2 parts of dodecyl alcohol and 35 parts of deionized water, and a mixture of 0.42 parts of chalk, 1.5 parts of mercaptopropionic acid and 40 parts of deionized water Mix the solution, drop it for 2.5-3.5 hours, continue to react for 1-2 hours after the drop, and then adjust the pH to 6-7 with liquid caustic soda to obtain a low air-entraining maleic anhydride polycarboxylate superplasticizer. Record the sample as M-3.

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Abstract

The invention discloses a low air-entraining type maleic anhydride poly carboxylic acid water reducing agent and a preparation method thereof. The low air-entraining type maleic anhydride poly carboxylic acid water reducing agent is prepared from the following components in parts by weight: 200 parts of TPEG, 15-22 parts of maleic anhydride, 3.5-6.0 parts of a functional monomer A, 0.5-1.2 parts of a functional monomer B, 1.9-3.0 parts of oxidant, 0.2-0.42 part of reducing agent, 0.5-1.5 parts of chain transfer agent and 345-360 parts of deionized water; and a pH value is regulated with liquid alkali to 6-7. The low air-entraining type maleic anhydride poly carboxylic acid water reducing agent is applied to high grade concrete and has the actions of low air entraining and viscosity reduction, so that the concrete has easy compaction ability and better gas exhausting ability, fair-faced concrete with good apparent effect can be obtained, and the technical problems of large viscosity, difficult exhaust and poor apparent effect of the high grade concrete are effectively solved. Meanwhile, the preparation technology is simple with normal temperature condition only needed, saves energy, is environmental-friendly and is liable in industrialization.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a low air-entraining maleic anhydride polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate high-performance water-reducing agent is a new type of green and environment-friendly water-reducing agent. It has the advantages of large degree of freedom in molecular structure design, less environmental pollution, adjustable functions, and high water-reducing rate. It has been widely used in Concrete works. Most of the traditional polycarboxylate superplasticizers are prepared by reaction at high temperature, which has low efficiency, high energy consumption and high cost. [0003] At present, concrete is still the most important building material in the construction industry. With the rapid development of my country's economy and the improvement of construction level, high-grade concrete is bei...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F222/06C08F226/10C08F220/14C08F226/06C08F220/18C08F2/38C08F2/44C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F2/38C08F2/44C08F283/065C08F220/1804
Inventor 廖毅坚杨顺荣蒋日阳李芳
Owner 福建路桥翔通建材科技有限公司
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