Polycarboxylic-acid concrete efficient water reducer with amide/imide structure and preparation method thereof

A high-efficiency water-reducing agent and polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems of difficult synthesis process, harsh conditions, and many side reactions, and achieve the effects of low cost, energy saving and consumption reduction, and good adaptability.

Active Publication Date: 2015-02-25
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention provides a polycarboxylate concrete high-efficiency water reducer with an amide / imide structure, which is difficult to synthesize, has many side reactions, harsh conditions, and high cost. A method for preparing a high-efficiency water-reducing agent for carboxylic acid concrete, the process operation is simple and easy to control, the preparation and synthesis process is safe and environmentally friendly, low in cost, energy-saving and consumption-reducing; It has the advantages of remarkable water dispersion effect, high storage stability, and reduced slurry viscosity at low water-binder ratio. It has good adaptability to different cements at low dosage or low water-cement ratio.

Method used

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  • Polycarboxylic-acid concrete efficient water reducer with amide/imide structure and preparation method thereof
  • Polycarboxylic-acid concrete efficient water reducer with amide/imide structure and preparation method thereof
  • Polycarboxylic-acid concrete efficient water reducer with amide/imide structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Step 1) Neutralize 45g of ethylamine with equimolar acetic acid and add 107.8g of maleic anhydride into the reactor. Under the protection of nitrogen, heat up to 60°C, add 0.18g of concentrated sulfuric acid, continue to heat up to 95°C, and keep the temperature for 4h , cooling to obtain the acylated product c.

[0065] Step 2) In the glass reactor equipped with thermometer, stirrer, dropping funnel and nitrogen inlet tube, add 200g deionized water, add 12.5g acylate product c, 240g methallyl polyethylene glycol ether simultaneously (Mn=2400g / mol), 19.6g of maleic anhydride, while stirring, purging the reaction vessel with nitrogen, and heating up to 60°C to dissolve, then adding 2.72g of ammonium persulfate, and stirring evenly. Then mix 4.08g of mercaptoacetic acid and 134g of water, stir to form a uniform monomer aqueous solution, add it dropwise to the reactor for 2 hours, keep it warm for 2 hours after the addition, cool to room temperature, and add alkali to neut...

Embodiment 2

[0067] Step 1) After neutralizing 59.1g of N-ethylmethylamine with equimolar acetic acid and adding 168.3g of itaconic anhydride into the reactor, under the protection of nitrogen, the temperature was raised to 60°C, and 0.35g of p-toluenesulfonic acid was added, Continue to raise the temperature to 100°C, keep the temperature constant for 3h, then lower the temperature to obtain the acylated product c.

[0068] Step 2) In the glass reactor equipped with thermometer, stirrer, dropping funnel and nitrogen inlet tube, add 75g of deionized water, add 15.3g of acylated product c, 16.8g of itaconic anhydride at the same time, and use nitrogen gas while stirring Purging reaction vessel, and be warming up to 70 ℃ and dissolve, add dropwise the initiator solution of 200g polyethylene glycol monomethyl ether methacrylate (Mn=2000g / mol) solution, 4.75g sodium persulfate (60g) water and 5.23g of sodium bisulfite, 60g of aqueous solution, the dropping time is 3h, after the dropping is com...

Embodiment 3

[0070] Step 1) After neutralizing 45g of ethylamine with equimolar acetic acid, add 117.6g of maleic anhydride into the reactor, under the protection of nitrogen, heat up to 60°C, add 0.25g of p-toluenesulfonic acid, continue to heat up to 105°C, Keep the temperature for 5 hours, then lower the temperature to obtain the acylated product c.

[0071] Step 2) in the glass reactor equipped with thermometer, stirrer, dropping funnel and nitrogen inlet pipe, add 197g deionized water, add 25g acylate product c, 240g methyl butenyl polyethylene glycol ether ( Mn=2400g / mol), purging the reaction vessel with nitrogen while stirring, and heating up to 65°C to dissolve, then adding 1.65g of hydrogen peroxide (mass concentration: 30%), and stirring evenly. Then 0.41g of L-ascorbic acid, 64.5g of methacrylic acid, 1.65g of 3-mercaptopropionic acid, and 132g of water were mixed, stirred to form a uniform monomer aqueous solution, which was added dropwise to the reactor for 2 hours. After co...

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Abstract

The invention provides a polycarboxylic-acid concrete efficient water reducer with an amide / imide structure. The polycarboxylic-acid water reducer prepared by employing the method has the advantages of being simple and easily controllable in technological operation, safe and environment-friendly in preparation synthesis, low in cost, energy-saving, consumption-reducing, substantial in water-reducing dispersing effect, high in storage stability, capable of reducing slurry viscosity under the condition of a low water-binder ratio, and the like. The polycarboxylic-acid water reducer has relatively good adaptability to different kinds of cement under the condition of low doping amount or low water-cement ratio, and helps to solve the problems that the raw material preparation cost of amide / imide type polycarboxylic acids is high, preparation conditions are severe and difficult to control, and the like.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a polycarboxylic acid with an amide / imide structure that can be used as a high-efficiency water reducer for concrete and a preparation method thereof. Background technique [0002] Water reducing agent is the most widely researched and applied concrete admixture at present, and admixture has become the fifth important component in concrete besides cement, sand, stone and water. Compared with traditional formaldehyde condensation water reducers (naphthalene, melamine, sulfamic acid salts), polycarboxylate high-efficiency water reducers have high water reducing rate, excellent slump retention performance and adjustable setting time , low shrinkage, good concrete appearance quality, low alkali content and chloride ion content, good adaptability to cementitious materials, etc. [0003] According to the connection mode of the branch chain and the mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F290/06C08F222/06C08F222/04C08F220/06C08F222/38C08F2/38C04B24/32C04B103/30
CPCC04B24/267C04B2103/302
Inventor 冉千平王秀梅杨勇舒鑫刘金芝
Owner JIANGSU SOBUTE NEW MATERIALS
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