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Preparation method of composite adsorption-type solid water reducing agent for sulphoaluminate cement

A technology of sulfoaluminate cement and composite adsorption, which is applied in the field of solid water reducing agent to achieve excellent setting retardation effect, improve dispersibility and delay generation effect

Active Publication Date: 2020-03-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this requires a fundamental innovation in the molecular structure of the synthesized polymer, not sticking to the design route of the traditional water reducer, and innovatively synthesizing a linear structure water reducer with fast adsorption capacity and a strong steric position. Comb structure superplasticizer with high resistance, and composite adsorption superplasticizer prepared by charge adsorption, which not only has good initial fluidity of cement slurry, but also has excellent slurry fluidity retention ability and retarding effect, and at the same time It is also conducive to industrialized production and popularization and application, and there is no report about the work in this area at home and abroad

Method used

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  • Preparation method of composite adsorption-type solid water reducing agent for sulphoaluminate cement
  • Preparation method of composite adsorption-type solid water reducing agent for sulphoaluminate cement
  • Preparation method of composite adsorption-type solid water reducing agent for sulphoaluminate cement

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Experimental program
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Effect test

Embodiment 1

[0031] First, 5.76g of acrylic acid was added to the reactor, stirred and heated to 120°C, and then a mixed solution of 17.84g of phosphonic acid-B-styryl ester, 0.31g of mercaptoethanol and 0.892g of methylamine was added dropwise for 3 hours, and divided into 12 Add 0.73g of ammonium persulfate at a time, and the stirring time is 5 minutes between each addition, continue the constant temperature reaction for 1 hour after the dropwise addition, stop the reaction, cool to 15°C, and obtain a linear solid water reducer; then add 8.609g of vinyl acetate Mix well with 86.09g of toluene, add 1.21g of allyl bromide, 4.305g of cuprous bromide, 6.8508g of N,N,N,N,N-pentamethyldivinyltriamine, and treat with nitrogen gas three times under ice-water bath After deoxygenation for 5 minutes, stir for 15 minutes until it is evenly mixed, under nitrogen protection, heat up to 30°C for polymerization reaction, react for 3 hours, desalt and vacuum distillation to remove toluene, add 12.816g of ...

Embodiment 2

[0033]First, 8.26g of methacrylic acid was added to the reactor, stirred and heated to 80°C, then 13.13g of 10-(2-methacryloyloxy) monodecyl phosphate, 0.52g of thioglycolic acid and 0.788g of urea were added dropwise Mix the solution for 4 hours, add 0.97g potassium persulfate in 15 times, and stir for 8 minutes between each addition, continue the constant temperature reaction for 3 hours after the dropwise addition, stop the reaction, cool to 15°C, and obtain a linear solid water reducer ; Next, mix 50.06g vinyl propionate and 400g p-xylene evenly, add 0.9055g methallyl chloride, 1.485g cuprous chloride, 2.3427g 2,2-bipyridine, and process 5 times with nitrogen in an ice-water bath After deoxygenation for 8 minutes, stir for 30 minutes until it is evenly mixed, under the protection of nitrogen, heat up to 50°C for polymerization reaction, react for 8 hours, desalt and vacuum distillation to remove p-xylene, add 103.6575g of ethanol, stir and heat up to 40 ℃, add 0.378g potas...

Embodiment 3

[0035] First, 11.76g of acrylic acid was added to the reactor, stirred and heated to 60°C, and then a mixed solution of 14.73g of phosphonic acid-B-styryl ester, 0.84g of mercaptopropionic acid and 1.03g of ethylamine was added dropwise for 6 hours. Add 0.95g of sodium persulfate 10 times, and the stirring time is 10 minutes between each addition, continue the constant temperature reaction for 4 hours after the dropwise addition, stop the reaction, cool to 20°C, and obtain a linear solid water reducer; then add 114.14g of butyric acid Mix vinyl ester and 570.7g dimethylformamide evenly, add 1.4903g ​​1-bromo 3-methyl-2-butene, 8.626g ferrous bromide, 13.8234g 1,1,4,7,10,10-hexamethyl Triethylenetetramine, treated with nitrogen in an ice-water bath for 4 times and deoxygenated for 10 minutes, stirred for 25 minutes until it was mixed evenly, and then heated to 60°C under the protection of nitrogen to carry out polymerization reaction, reacted for 12 hours, desalted and distilled...

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Abstract

The invention relates to a preparation method of a composite adsorption-type solid water reducing agent for sulphoaluminate cement. Firstly, a linear solid water reducing agent is synthesized; then acomb-shaped solid water reducing agent is synthesized; and furthermore, a solid water reducing agent is prepared by a composite adsorption method. Namely, unsaturated carboxylic acid and unsaturated phosphate are copolymerized first; meanwhile, a polyhydroxy side chain macromonomer is self made and is copolymerized with unsaturated polyoxyethylene ether, a cationic monomer and an anionic monomer;and then the polymerization products are fully mixed and ground to obtain the composite adsorption-type solid water reducing agent. The composite adsorption-type water reducing agent prepared by the method is novel and unique in structure and excellent in performance, can be widely applied to sulphoaluminate cement to improve fluidity and retention capacity of pure slurry and prolong the operationtime, and well solves the problems of too fast setting and hardening of sulphoaluminate cement slurry, fast fluidity loss and the like. In addition, the composite adsorption-type water reducing agentis prepared into a form of solid products, so that application in repairing materials is facilitated. The prepared composite adsorption-type water reducing agent has a more excellent action effect and application suitability compared with a conventional water reducing agent, and the market prospect is wide.

Description

technical field [0001] The invention relates to the technical field of a solid water reducer for sulphoaluminate cement, in particular to a comb-shaped solid water reducer prepared by using unsaturated carboxylic acid and unsaturated phosphate monomers to prepare a linear solid water reducer. The specific preparation method of water agent followed by composite adsorption to prepare solid water reducer. Background technique [0002] In recent years, with the continuous improvement of the building materials industry's requirements for energy conservation and environmental protection, sulphoaluminate cement has attracted more and more attention from academia and industry, especially the high belite sulphoaluminate derived from sulphoaluminate cement For salt cement, the clinker calcination temperature is lower and the limestone raw material consumption is low, the energy consumption and CO 2 The emission is significantly lower than that of the most commonly used ordinary Portl...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F230/02C08F220/06C08F283/06C08F263/04C04B24/24C04B103/30
CPCC04B24/243C04B2103/302C08F220/06C08F230/02C08F263/04C08F283/065C08G81/021
Inventor 刘晓卢磊宋晓飞王子明许谦白夏冰赖光洪管佳男
Owner BEIJING UNIV OF TECH
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