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Method for preparing high mud-resistant polycarboxylic acid dispersant by grafting cationic side chains by copolymerization of unsaturated halogenated hydrocarbons

A technology of unsaturated and halogenated hydrocarbons, applied in the field of high mud-resistant dispersants, to achieve the effect of broadening research directions and design ideas, broad application prospects, and less side reactions

Active Publication Date: 2019-04-05
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this requires the synthetic concrete dispersant to achieve a fundamental innovation in molecular structure, not only to have the composite performance of water-reducing and slump-resistance-mud resistance, but also to ensure convenient process operation, low preparation cost, simple and easy The obtained reaction raw materials are conducive to industrialized production and popularization and application, and there are no reports about the work in this area at home and abroad

Method used

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  • Method for preparing high mud-resistant polycarboxylic acid dispersant by grafting cationic side chains by copolymerization of unsaturated halogenated hydrocarbons
  • Method for preparing high mud-resistant polycarboxylic acid dispersant by grafting cationic side chains by copolymerization of unsaturated halogenated hydrocarbons
  • Method for preparing high mud-resistant polycarboxylic acid dispersant by grafting cationic side chains by copolymerization of unsaturated halogenated hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, 7.82g of methacrylic acid, 1.06g of fumaric acid, 1.91g of allyl chloride, 0.61g of dibenzoyl peroxide, and 86.36g of dimethyl sulfoxide will be added to the reactor successively, and the stirring time between each feeding After 18 minutes, the reactor was filled with nitrogen repeatedly 3 times to deoxygenate and then sealed for 30 minutes, and the temperature was raised to 90°C for polymerization reaction. After 3 hours of reaction, 91.76g of methanol was added, and the precipitate was repeatedly washed 4 times, and the precipitate was vacuum-dried at 60°C. To constant weight, the carboxylic acid-chlorinated hydrocarbon copolymer is obtained; 48.5g dimethyl diallyl ammonium chloride and 0.45g isopropanol are added in another reactor, and then 562.94g water is added to prepare the mass concentration It is an 8% aqueous solution, and the reactor is filled with nitrogen repeatedly 4 times to remove oxygen and then sealed for 20 minutes. Add 0.89g of ammonium cerium...

Embodiment 2

[0031] The polycarboxylic acid dispersant solution with a concentration of 40% obtained in Example 1 was stored at 6° C. for 30 days, and its implementation effect was measured.

Embodiment 3

[0033] First, 7.17g of methacrylic acid, 1.63g of maleic anhydride, 2.03g of 4-bromo-1-butene, 0.76g of azobisisobutyronitrile, and 108.34g of dimethyl sulfoxide will be successively added to the reactor. The stirring time is 5 minutes at intervals, the reactor is filled with nitrogen repeatedly 3 times to remove oxygen for 25 minutes, and then sealed, and the temperature is raised to 110°C for polymerization reaction. After 2 hours of reaction, 102.92g of methanol is added, and the precipitate is washed repeatedly for 3 times, and the precipitate is placed at 80°C Dry under vacuum to constant weight to obtain carboxylic acid-brominated hydrocarbon copolymer; 8.83g methacryloxyethyl dimethyl butyl ammonium bromide and 0.36g n-propanol are added in another reactor, and then Add 450.14g of water to prepare an aqueous solution with a mass concentration of 2%, fill the reactor with nitrogen gas repeatedly for 4 times to remove oxygen and then seal it for 10 minutes, add 0.33g of ce...

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Abstract

Belonging to the field of dispersants, the invention provides a method for preparation of high mud resistant polycarboxylic acid dispersant by unsaturated halogenated hydrocarbon copolymerization and grafting with a cationic side chain. The method consists of: employing an unsaturated carboxylic acid monomer, an unsaturated halogenated hydrocarbon monomer, an unsaturated cationic quaternary ammonium salt monomer, a polyethylene glycol compound and the like as the raw materials, firstly conducting main chain copolymerization, then polymerizing the cationic side chain, performing functionalization, and finally carrying out etherification grafting so as to synthesize the excellent performance high mud resistant polycarboxylic acid dispersant material with unsaturated halogenated hydrocarbon copolymerized and grafted with cationic side chain, i.e. taking unsaturated carboxylic acid and unsaturated halogenated hydrocarbon as the reactants, conducting free radical polymerization to obtain a carboxylic acid-halogenated hydrocarbon copolymer main chain, using high valence cerium salt-alcohol to initiate polymerization of an unsaturated cationic quaternary ammonium salt monomer so as to obtain a hydroxyl terminated cationic side chain, then modifying the hydroxyl terminated cationic side chain and the polyethylene glycol compound to obtain a functionalized side chain, and carrying out etherification grafting of the functionalized side chain on the carboxylic acid-halogenated hydrocarbon copolymer main chain. The method provided by the invention realizes high water reduction, slump loss resistance, high clay resistance and other multiple effects.

Description

technical field [0001] The invention relates to the technical field of a high-mud-resistant dispersant for cement concrete, in particular to a kind of dispersant that first copolymerizes unsaturated carboxylic acid and unsaturated halogenated hydrocarbon into the main chain, then polymerizes the cationic side chain and functionalizes the main side A specific preparation method for synthesizing a highly mud-resistant polycarboxylic acid dispersant by chain etherification grafting. Background technique [0002] The rapid development of building materials and concrete engineering technology has accelerated the in-depth exploration and systematic research of concrete chemical admixtures, especially polycarboxylic acid chemical admixtures, which have gradually been widely used due to their advantages of small dosage and high water reducing rate. , but its sensitivity to aggregate mud content greatly affects its workability and effectiveness, and restricts its further important ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02C08F220/06C08F222/02C08F222/06C08F214/14C08F214/16C08F126/02C08F120/34C08F4/40C04B24/28C04B103/40
CPCC04B24/28C04B2103/408C08F4/40C08F120/34C08F126/02C08F220/06C08F222/02C08G81/02C08G81/025C08F214/14C08F222/06C08F214/16
Inventor 刘晓管佳男王子明辛鹏浩奚文博
Owner BEIJING UNIV OF TECH
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