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Photo-initiation type polycarboxylic acid water reducing agent and preparation method thereof

A type of polycarboxylic acid and photoinitiator technology, applied in the field of photoinitiated polycarboxylate water reducer and its preparation, can solve the problems of complex production process, long reaction time, low production efficiency, etc., and achieve simple production process, Short reaction time and improved production efficiency

Inactive Publication Date: 2016-08-03
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

The literature reports all use heat or adding a reducing agent as the activator, the production process is complicated, the reaction takes a long time, the production efficiency is low, and the energy consumption is high

Method used

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  • Photo-initiation type polycarboxylic acid water reducing agent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Isopentenol polyoxyethylene ether (molecular weight 2400): 85 parts

[0025] Acrylic: 13 parts

[0026] Mercaptopropionic acid: 0.6 parts

[0027] Photoinitiator-2959: 0.7 parts

[0028] Deionized water: 60 parts

[0029] At room temperature, add water, isopentenol polyoxyethylene ether, acrylic acid, mercaptopropionic acid, and photoinitiator-2959 into the photoinitiator reaction kettle, stir to dissolve, and mix well; turn on the ultraviolet light, and the light frequency is 275 -350nm continuous change, light intensity 15mj / cm 2 , irradiated for 5 minutes, aged for 1 hour, and neutralized by adding sodium hydroxide to pH=6.5, which is the product with a mass concentration of 60%.

[0030] Comparative sample 1

[0031] Isopentenol polyoxyethylene ether (molecular weight 2400): 85 parts

[0032] Acrylic: 13 parts

[0033] Mercaptopropionic acid: 0.6 parts

[0034] Hydrogen peroxide: 0.84 parts

[0035] Vitamin C: 0.25 parts

[0036] Deionized water: 60 parts ...

Embodiment 2

[0039] Allyl polyoxyethylene ether (molecular weight 1200): 72 parts

[0040] Acrylic: 15 parts

[0041] Maleic anhydride: 12 parts

[0042] Thioglycolic acid: 0.7 parts

[0043] Photoinitiator-QTX: 0.4 parts

[0044] Deionized water: 35 parts

[0045] At room temperature, add deionized water, allyl polyoxyethylene ether, acrylic acid, maleic anhydride, thioglycolic acid, and photoinitiator-QTX into the photoinitiation reactor, stir to dissolve, and mix well; turn on the UV lamp Irradiation, the light frequency changes continuously at 200-400nm, 20mj / cm 2 , irradiated for 4 minutes, aged for 2 hours, and neutralized by adding potassium hydroxide to pH = 7, which is the product with a mass concentration of 70%.

[0046] Comparative sample 2

[0047] Allyl polyoxyethylene ether (molecular weight 1200): 70 parts

[0048] Acrylic: 15 parts

[0049] Maleic anhydride: 12 parts

[0050] Thioglycolic acid: 0.7 parts

[0051] Hydrogen peroxide: 1.1 parts

[0052] Vitamin C: ...

Embodiment 3

[0056] Methallyl polyoxyethylene ether (molecular weight 2900): 80

[0057] Methacrylic acid: 8

[0058] Hydroxyethyl Acrylate: 12

[0059] Mercaptopropionic acid: 0.4

[0060] Photoinitiator-HBP:0.6

[0061] Deionized water: 100

[0062] At 5°C, add deionized water, methallyl polyoxyethylene ether, methacrylic acid, hydroxyethyl acrylate, mercaptopropionic acid, and photoinitiator-HBP into the photoinitiation reactor, stir to dissolve, and mix Uniform; turn on the UV lamp irradiation, the light frequency changes continuously at 350-550nm, 12mj / cm 2 , irradiated for 8 minutes, aged for 0.5 hours, and neutralized by adding sodium hydroxide to pH=7.5, which is the product, and its mass concentration is 50%.

[0063] Comparative sample 3

[0064] Methallyl polyoxyethylene ether (molecular weight 2900): 80

[0065] Methacrylic acid: 8

[0066] Hydroxyethyl Acrylate: 12

[0067] Mercaptopropionic acid: 0.4

[0068] Hydrogen peroxide: 0.4 parts

[0069] Vitamin C: 0.12 pa...

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Abstract

The invention relates to a photo-initiation type polycarboxylic acid water reducing agent and a preparation method thereof. The preparation method comprises the following steps: dissolving the following components into water in parts by weight: 72 to 90 parts of a big polyether monomer, 10 to 27 parts of an unsaturated poly-monomer, 0.2 to 0.9 part of a molecular weight modifier and 0.3 to 1.0 part of a photoinitiator, so as to obtain a mixed monomer solution; continuously performing ultraviolet irradiation on the mixture in a photo-initiation reactor, then performing aging reaction in a reaction kettle for 0.2 to 2 h, and neutralizing to reach the PH of 6.5 to 7.5 so as to obtain a finished product. The preparation method can be carried out under room temperature, and even low temperature, so that the energy consumption is low; the reaction is fast, and the production efficiency is high; the whole reaction process is short in time. The process method is simple and is easy to operate, and the production efficiency of the polycarboxylic acid water reducing agent can be greatly improved, so that the product has higher market competitiveness.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer for cement concrete and a preparation method thereof, in particular to a photoinitiated polycarboxylate water reducer and a preparation method thereof. technical background [0002] Polycarboxylate superplasticizer has become the research and application development in recent years and even in the future because of its low dosage, high water reducing rate, good fluidity and retention of fresh concrete, low shrinkage, and environmental friendliness. focus. The research, development and production application of domestic polycarboxylate superplasticizers have made great progress, and the products have gradually moved from relatively single to multi-variety, multi-functional and multi-level development. [0003] The polycarboxylate superplasticizer products currently on the market mainly use the thermal cracking of peroxides and the redox system to release free radicals and initiate the activity of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/06C08F220/28C08F220/56C08F2/48C04B24/26C04B103/30
CPCC04B24/2647C04B2103/302C08F2/48C08F283/065C08F220/281
Inventor 张岭钱珊珊丁蓓王毅姜海东郑春扬
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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