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A fluorescent polycarboxylate water reducer and its preparation method

A polycarboxylic acid-based and water-reducing agent technology is applied in the field of water-reducing agents for cement concrete, which can solve problems such as short service life, and achieve the effects of reducing reaction difficulty, rapid reaction and high efficiency, and simple operation.

Active Publication Date: 2021-12-03
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most signs and luminous concrete are fluorescent paints, but their service life is short, and it is not the best choice to deal with the harsh working environment of the road

Method used

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  • A fluorescent polycarboxylate water reducer and its preparation method
  • A fluorescent polycarboxylate water reducer and its preparation method
  • A fluorescent polycarboxylate water reducer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Keep 2 mol of acrylic acid, 1 mol of allyl polyethylene glycol (weight average molecular weight 300) under the combined action of 0.1 mol of hydrogen peroxide, 0.05 mol of white block, and 0.03 mol of 2-mercaptopropionic acid at a temperature of 5°C Carry out redox free radical polymerization reaction for 5 hours under low temperature to obtain the pre-product of water reducer;

[0028] 2) 1 mol of the water reducer pre-product obtained in step 1) and 10 mol of N-(hydroxyethyl) carbazole with fluorescent properties were subjected to an esterification reaction for 5 hours under the action of 0.1 mol of solid acid, and then potassium hydroxide was used to The pH value was adjusted to 7, and water was added to obtain a fluorescent polycarboxylate water reducer with a concentration of 60 wt % and a weight average molecular weight of 20,000.

Embodiment 2

[0030] 1) Keep 3mol methacrylic acid, 1mol methallyl polyethylene glycol (weight average molecular weight 800) under the action of 0.08mol ammonium persulfate, 0.1mol sodium sulfite and 0.04mol mercaptoethanol at a temperature of 15°C Carrying out 4 hours of redox radical polymerization to obtain the pre-product of water reducer;

[0031] 2) 1 mol of the pre-product of the water reducer obtained in step 1) and 7 mol of N-(hydroxymethyl) carbazole with fluorescent properties were subjected to an esterification reaction for 3 hours under the action of 0.08 mol of concentrated sulfuric acid, and then dissolved in sodium hydroxide The pH value was adjusted to 6, and water was added to obtain a fluorescent polycarboxylate water reducer with a concentration of 50 wt % and a weight average molecular weight of 40,000.

Embodiment 3

[0033] 1) 4mol sodium acrylate, 1mol 3-methyl-3-butene-1-polyethylene glycol (weight average molecular weight is 1000), in 0.06mol sodium persulfate, 0.15mol sodium metabisulfite and 0.05mol dodecanethiol Under the combined action, keep the temperature at 25°C for 3 hours for redox radical polymerization to obtain the pre-product of the water reducer;

[0034] 2) 1 mol of the water reducer pre-product obtained in step 1) and 6 mol of 9-(p-hydroxymethyl)phenylcarbazole with fluorescent properties were subjected to an esterification reaction for 4 hours under the action of 0.03 mol of p-toluenesulfonic acid, and then Calcium hydroxide is used to adjust the pH value to 6.5, and water is added to obtain a fluorescent polycarboxylate water-reducer with a concentration of 50 wt % and a weight-average molecular weight of 50,000.

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PUM

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Abstract

The invention discloses a fluorescent polycarboxylate water-reducer and a preparation method thereof. The preparation process of the water-reducer is first to use unsaturated acid and its derivative monomers and unsaturated polyether monomers to oxidize-reduce free radicals. Polymerization reaction to generate a pre-product of the water-reducing agent, and then esterify the pre-product of the water-reducing agent with organic molecules with fluorescent properties to obtain a fluorescent polycarboxylic acid-based water-reducer. The method of the invention effectively reduces the difficulty of the reaction, has rapid and efficient reaction, is non-toxic and pollution-free, has good controllability of the production process, less side reactions, strong adaptability to different cement varieties, high water-reducing rate, and high cost performance and competitive price. Advantage.

Description

technical field [0001] The invention relates to the technical field of a water reducer for cement concrete, in particular to a method for preparing a fluorescent poly water reducer by combining a redox radical polymerization reaction and an esterification reaction. Background technique [0002] The patent (application number: 201710458500.3) discloses a UV and fluorescent dual tracer concrete admixture, which is composed of allyloxypolyethylene ether monomer or end-capped allyloxypolyethylene ether monomer, unsaturated carboxyl The acid monomer or unsaturated carboxylic acid anhydride monomer and the water-soluble fluorescent monomer containing unsaturated double bonds are obtained by free radical polymerization. The raw materials of synthetic polymers are non-toxic and harmless, and conform to the characteristics of clean production. When the inventive polymer is used as a water reducer, it can also accurately and efficiently help analyze the internal filling of concrete a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/56C08F8/32C08F290/06C08F212/14C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F8/30C08F283/065C08F290/062C08F220/06C08F220/56C08F212/14C04B24/2647C04B24/2694C04B28/02C04B2103/32C04B2111/807C08F8/14C04B2103/0061C04B2103/54C08F299/026C08F2810/00
Inventor 钱珊珊郑春扬黄春满姜海东胡阳成李伟甘杰忠
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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