The method for synthesizing cement dispersant of acrylamide-fatty acid vinyl ester graft copolymer

A technology of fatty acid vinyl ester and graft copolymer, which is applied in the field of dispersant for cement concrete, can solve the problems of single raw material variety, large loss, and spread to concrete, etc., and achieves the effects of improving stability, preventing cement coagulation, and mild conditions.

Active Publication Date: 2017-03-22
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned preparation methods all have a certain degree of inadequacy. The macromonomers used in the synthesis of water reducers all need ethylene oxide or propylene oxide to make, and the raw material species are too single. The supply of propane is difficult, and the production of the existing polycarboxylate superplasticizer is bound to be restricted to a certain extent, which will affect the concrete industry and cause great losses
Therefore, it is required to find substitutes for ethylene oxide and propylene oxide as soon as possible, to enrich the types of raw materials, and to play their role in the structure of the water reducer, to maintain its excellent performance, and to ensure fast Simple process operation and low preparation cost, easy to industrialized production, there is no report on this aspect of work at home and abroad

Method used

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  • The method for synthesizing cement dispersant of acrylamide-fatty acid vinyl ester graft copolymer
  • The method for synthesizing cement dispersant of acrylamide-fatty acid vinyl ester graft copolymer
  • The method for synthesizing cement dispersant of acrylamide-fatty acid vinyl ester graft copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Add 200g of water into the reactor, heat up to 95°C, add 1.3g of mercaptoacetic acid, and then add dropwise 500g of 20% acrylamide aqueous solution and 228.4g of 5% potassium persulfate aqueous solution for 1 hour, After the dropwise addition, the constant temperature reaction was continued for 5 hours, and then the solvent water was distilled off under reduced pressure to obtain polyacrylamide, a polymerization product. Take 90g of the obtained polyacrylamide and 450g of acetic acid and add them into the reactor to stir, raise the temperature to 70°C, add 17.53g of thioglycolic acid, dropwise add the mixed solution of 327g of vinyl acetate and 20.83g of azobisisobutyronitrile for 6 hours, After the dropwise addition, the constant temperature reaction was continued for 4 hours. After the reaction, the acetic acid solvent was distilled off under reduced pressure to obtain the graft copolymer polyacrylamide-g-polyvinyl acetate. Add 417.66g of the obtained graft copolymer t...

Embodiment 2

[0028] After the cement dispersant solution with a concentration of 20% by mass obtained in Example 1 was stored at 6° C. for 15 days, its implementation effect was measured.

Embodiment 3

[0030] Add 400g of water into the reactor, heat up to 80°C, add 2.99g of mercaptopropionic acid, and then add dropwise 400g of 25% acrylamide aqueous solution and 83.9g of 20% sodium persulfate aqueous solution for 5 hours After the dropwise addition, the constant temperature reaction was continued for 3 hours, and then the solvent water was distilled off under reduced pressure to obtain polyacrylamide, a polymerization product. Take 90g of the obtained polyacrylamide and 1200g of acetic acid and add them to the reactor to stir, raise the temperature to 50°C, add 26.92g of mercaptopropionic acid, and dropwise add the mixed solution of 1270g of vinyl propionate and 31.5g of azobisisoheptanonitrile 10 After the dropwise addition, the constant temperature reaction was continued for 1 hour. After the reaction, the acetic acid solvent was distilled off under reduced pressure to obtain the graft copolymer polyacrylamide-g-polyvinyl propionate. Add 1360g of the obtained graft copolym...

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Abstract

The invention relates to a method for synthesizing cement disperser from an acrylamide-fatty acid vinyl ester graft copolymer. The method comprises the following steps: taking acrylamide and fatty acid vinyl ester as main reaction raw materials, and compounding a cement disperser by using the acrylamide-fatty acid vinyl ester graft copolymer prepared from a method of polymerizing, grafting, alcoholysis reacting and hydrolyzing, namely taking the acrylamide as a reaction monomer, polymerizing under the effect of an initiator and a molecular weight modifier, and grafting and polymerizing with the fatty acid vinyl ester to obtain a grafting copolymer, and performing alcoholysis reaction and hydrolyzation on the grafting copolymer to obtain the cement disperser in a structure with the main chain of polyacrylic acid and side chain of polyvinyl alcohol. The preparation method is simple in process, easy to control and low in cost. The fatty acid vinyl ester is adopted to substitute the current important compound materials of the cement disperser, namely ethylene oxide and propylene epoxide. The prepared cement disperser has excellent cement paste mobility and holding capacity and shows good cement adaptability and concrete application performance.

Description

technical field [0001] The invention relates to the technical field of a dispersant for cement concrete, in particular to a dispersant that uses acrylamide monomers to self-polymerize first, then graft copolymerize with fatty acid vinyl ester, and finally alcoholyze and hydrolyze to form a comb-like structure The specific synthesis method of cement dispersant. Background technique [0002] In recent years, with the rapid development of the construction industry, the amount of concrete and cement has been increasing, and the cement dispersant has become one of the very important components in the construction industry. Good slump performance, fast strength growth, strong adaptability and other advantages have become a hot spot in the research and development of concrete admixtures. However, polyoxyethylene ether, an important macromonomer for the synthesis of polycarboxylate superplasticizers, is mainly made of ethylene oxide and propylene oxide. The types of raw materials a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F265/10C08F218/08C08F218/10C08F120/56C08F8/12C04B24/26
Inventor 刘晓赵明王子明尹东杰刘玮申和庆
Owner BEIJING UNIV OF TECH
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