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A kind of viscosity reducing type polycarboxylate water reducing agent and preparation method thereof

A technology of viscous polycarboxylic acid and water reducing agent, applied in the field of water reducing agent, can solve the problems of difficulty in guaranteeing product stability, high energy consumption in the production process, unsatisfactory effect, etc., and achieve significant dimensional stabilization effect, low cost, Great potential for market application

Active Publication Date: 2020-08-11
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the technical defects of the existing viscosity-reducing polycarboxylate water-reducer, which have unsatisfactory effects, high energy consumption in the production process, and difficulty in ensuring product stability, the purpose of the present invention is to provide a viscosity-reducing polycarboxylate water-reducer and its preparation method

Method used

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  • A kind of viscosity reducing type polycarboxylate water reducing agent and preparation method thereof
  • A kind of viscosity reducing type polycarboxylate water reducing agent and preparation method thereof
  • A kind of viscosity reducing type polycarboxylate water reducing agent and preparation method thereof

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preparation example Construction

[0041] The preparation method of the present invention carries out the copolymerization reaction in the aqueous solution system, and temperature is the key condition of the polymerization reaction, and the formation of the reaction product can be better controlled within the reaction temperature range, so that the polymerization reaction can be carried out quickly and smoothly, and it is not easy to produce side effects. reaction, thereby simplifying the preparation process and reducing the preparation cost.

[0042] In one embodiment of the preparation method according to the present invention, the initiator used can be a common initiator in the field of polycarboxylate superplasticizer preparation, including but not limited to redox system, ammonium persulfate system, azobisiso Butyamidine hydrochloride and the like can be used in an amount of 0.3% to 2.8% of the total mass of the monomers.

[0043] In one embodiment of the preparation method according to the present inventi...

preparation example

[0060] c-1:

[0061] Weigh 230.0g of phenol and add it to a three-necked flask equipped with a condenser, a stirrer, and a thermometer, add 26.03g of modifier polyvinyl alcohol and 153.3g of distilled water, stir, add 2.28g of KOH, keep the temperature at 40°C, and stir to react 20min, add 66.5g formaldehyde, heat up, continue stirring for 40min, then add 0.98g KOH, raise the temperature to 70°C, keep stirring at constant temperature for 20min, finally add 146.8g formaldehyde, raise the reaction temperature to 90°C, and keep stirring at constant temperature After reacting for 20 minutes, the obtained product is water-soluble phenolic resin, then add 104g of 30% NaOH lye, and stir fully at 40°C for 1h; cool to room temperature, slowly add 65g of allyl chloride dropwise, after dropping, heat up to 70°C, and react 3h time; when a large amount of precipitates appear in the reaction system, the reaction is stopped, and the material is cooled and discharged; the product obtains c-1 ...

Embodiment 1

[0069] Add 173.3g of deionized water into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, stir and heat up to 50°C, add 223.6g of monomer (b-2), 10.4g of monomer (c-1 ), add 26g monomer (a-1) after the above-mentioned monomer dissolves, then add dropwise initiator (1.3g ammonium persulfate and 30g water mixture), chain transfer agent (0.52g mercaptoacetic acid and 40g water mixture) , respectively dropwise at a constant speed for 2 hours and react, the aging time is 1 hour, after the reaction, the temperature of the system is down to normal temperature, and the pH value of the reaction mixture is adjusted to neutrality with a NaOH aqueous solution with a mass concentration of 30%, and the material is discharged, i.e. The high-performance polycarboxylate water reducer product JN-1 was obtained, the solid content of the product was 40%, and the weight average molecular weight of the polymer was 32400.

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Abstract

The invention provides a viscosity reduction polycarboxylic acid water reducer and a preparation method thereof. The viscosity reduction polycarboxylic acid water reducer is a polymer taking unsaturated carboxylic acid, unsaturated polyalkoxylated ether and allyl or methyl allyl modified linear phenolic resin as co-monomers. The linear phenolic resin serving as the co-monomer is added into the viscosity reduction polycarboxylic acid water reducer, an aromatic nucleus structure can be introduced into the polycarboxylic acid water reducer, so that the adsorption efficiency and the adsorption thickness of cement particle surface polymer molecules can be effectively improved, the space stabilizing effect of the water reducer can be more remarkable, and the viscosity reduction polycarboxylic acid water reducer has obvious viscosity reduction effects and is simple in preparation method, strong in operability, low in energy consumption, low in cost and huge in market application potential.

Description

technical field [0001] The invention relates to the field of water reducers, in particular to a viscosity-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] At present, concrete is still the main and largest building material in the construction industry. In recent years, with the development of my country's construction industry, high-grade concrete is gradually entering the construction market due to its high strength, good integrity, and low self-weight, especially in bridge engineering. However, due to the low water-binder ratio and large amount of cementitious materials, high-grade concrete has the problems of high viscosity and slow flow speed in application. The water glue of high-strength and high-performance concrete is relatively small and has a high viscosity, which needs to be reduced. Mineral admixtures can adjust the cohesion of concrete, but it is not suitable for increasing the amount of cementitious materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F216/16C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F220/06
Inventor 朱建民刘兆滨董振鹏富扬刘晓杰
Owner LIAONING OXIRANCHEM INC
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