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Method for synthesizing cement dispersing agent by using terminated functional polyethylene fatty acid ester macromonomer

A technology of fatty acid vinyl ester and synthetic cement, which is applied in the field of cement dispersants, can solve the problems of affecting the concrete industry, loss, and single variety of raw materials, and achieve the effects of lowering prices, improving stability, and simplifying the preparation process

Active Publication Date: 2015-05-20
BEIJING UNIV OF TECH
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  • Summary
  • 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 macromers used in the synthesis of water reducers all need ethylene oxide or propylene oxide. If there is a problem in the supply of alkane, the production of the existing polycarboxylate superplasticizer is bound to be restricted to a certain extent, and then spread to the concrete industry, causing great losses
Therefore, it is necessary to find substitutes for propylene oxide and ethylene oxide as soon as possible, enrich the types of raw materials, prepare new macromonomers, and then prepare new cement dispersants, and maintain their excellent performance. Guaranteed simple process operation and low preparation cost, easy to industrialized production, related work in this area has not been reported at home and abroad

Method used

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  • Method for synthesizing cement dispersing agent by using terminated functional polyethylene fatty acid ester macromonomer
  • Method for synthesizing cement dispersing agent by using terminated functional polyethylene fatty acid ester macromonomer
  • Method for synthesizing cement dispersing agent by using terminated functional polyethylene fatty acid ester macromonomer

Examples

Experimental program
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Effect test

Embodiment 1

[0026] First, add 800g of toluene to the reactor, stir and raise the temperature to 80°C, add 3.12g of mercaptoethanol, then dropwise add the mixed solution of 100g of vinyl propionate and 3.28g of azobisisobutyronitrile for 1 hour, and the addition ends After continuing the constant temperature reaction for 5 hours, the toluene solvent was removed by distillation under reduced pressure to obtain polyvinyl propionate. Dissolve 100g of the obtained polyvinyl propionate in 1000g of sulfolane, stir and heat up to 50°C, add 5.56g of sodium hydroxide, react for 0.5 hours, then add 1.06g of 3-chloropropene and 0.94g of tetrabutylphosphine bromide in sequence , reacted for 2 hours, and then filtered the reaction solution to remove the generated sodium chloride, then purified 3 times with a mixed solvent of methanol-water with a volume ratio of 1:1, and then dried in vacuo. Add 100g of end-group-functionalized polyvinyl propionate into 160g of methanol, stir and heat up to 30°C, add 0...

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] First, add 200g of methanol into the reactor, stir and heat up to 60°C, add 5.34g of mercaptopropanol, then add dropwise the solution of 100g of vinyl acetate and 5.75g of azobisisoheptanonitrile for 6 hours, and the dropwise addition ends After continuing the constant temperature reaction for 2 hours, the methanol solvent was distilled off under reduced pressure to obtain polyvinyl acetate. Dissolve 100 g of the obtained polyvinyl acetate in 100 g of dimethyl sulfoxide, stir and heat up to 30 ° C, add 2.17 g of potassium hydroxide, react for 5 hours, then add 1.48 g of 3-chloropropene and 0.62 g of tetrabutyl ammonium bromide, reacted for 1 hour, and then filtered the reaction solution to remove the generated potassium chloride, then purified 5 times with a mixed solvent of methanol-water with a volume ratio of 2:1, and then dried in vacuum. Add 100g of end-group-functionalized polyvinyl acetate into 160g of ethanol, stir and heat up to 40°C, add 0.58g of potassium hyd...

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Abstract

The invention relates to a method for synthesizing a cement dispersing agent by using a terminated functional polyethylene fatty acid ester macromonomer. The cement dispersing agent is prepared by taking fatty acid vinyl ester as a main reaction raw material through a method comprising the steps of autopolymerization, substitution, alcoholysis and copolymerization, namely, polymerizing by taking fatty acid vinyl ester as a reaction monomer under the action of an initiator and a chain transfer agent to generate a polymer; then, carrying out substitution reaction on the polymer and an unsaturated chlorinated substance to obtain a polyethylene fatty acid ester macromonomer of which the macromolecular chain terminal is a double bond; next, carrying out alcoholysis on the macromonomer to prepare a macromonomer with the double bond at the terminal and with a polyvinyl alcohol structure; and finally, carrying out copolymerization reaction on the macromonomer and a carboxylic acid micromonomer to prepare the cement dispersing agent. The method is simple and easily-controlled in process, low in cost, environment-friendly and pollution-free; and the cement dispersing agent prepared by taking fatty acid vinyl ester as the raw material has favorable net cement paste flowability and holding capacity and shows favorable cement adaptability and concrete application property.

Description

technical field [0001] The invention relates to the technical field of a dispersant for cement concrete, in particular to a method of self-polymerizing and then substituting a fatty acid vinyl ester monomer to obtain a terminal-functionalized polyfatty acid vinyl ester macromonomer, which is then alcoholysed and then combined with The specific preparation method of cement dispersant by copolymerization of small carboxylic acid monomers. Background technique [0002] In recent years, with the rapid development of the construction industry, the amount of concrete and cement has been increasing, and cement dispersants have become one of the essential components in the construction industry. Among them, the emergence of polycarboxylate water reducers has solved the problem of In the past, the problems of low water-reducing rate and slow setting of ordinary lignosulfonate-based water-reducing agents, and the shortcomings of naphthalene-based water-reducing agents polluting the en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F263/02C08F220/06C08F220/56C08F222/06C08F222/02C08F118/08C08F118/10C08F8/24C08F2/38C04B24/26C04B103/40
Inventor 刘晓赵明王子明刘玮尹东杰庞晓凡
Owner BEIJING UNIV OF TECH
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