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Method for preparing polycarboxylate superplasticizer by carrying out graft copolymerization on acrylic ester polymer and fatty acid vinyl ester

A fatty acid vinyl ester and acrylate technology, which is applied in the specific preparation field of polycarboxylate superplasticizer, can solve the problems of incalculable loss, single variety of raw materials, and spread to concrete, etc., to prevent cement coagulation, improve stability, improve conditions mild effect

Active Publication Date: 2015-05-20
GUIZHOU DR SHI 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 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. If the supply of propane is cut off, the production of the existing polycarboxylate superplasticizer will inevitably be restricted to a certain extent, and then spread to the concrete industry, and the loss is immeasurable
Therefore, it is required to find substitutes for ethylene oxide and propylene oxide as soon as possible, to enrich the diversification of raw materials, and to play their role and mechanism in the structure of the water reducer, to maintain their excellent performance, and at the same time Guaranteed fast 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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  • Method for preparing polycarboxylate superplasticizer by carrying out graft copolymerization on acrylic ester polymer and fatty acid vinyl ester
  • Method for preparing polycarboxylate superplasticizer by carrying out graft copolymerization on acrylic ester polymer and fatty acid vinyl ester
  • Method for preparing polycarboxylate superplasticizer by carrying out graft copolymerization on acrylic ester polymer and fatty acid vinyl ester

Examples

Experimental program
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Effect test

Embodiment 1

[0025] First, add 200g of methanol into the reactor, raise the temperature to 60°C, add 3.489g of isopropanol, then add dropwise the solution of 100g of methyl acrylate and 0.288g of azobisisoheptanonitrile for 10 hours, and continue to After constant temperature reaction for 0.5 hours, the methanol was distilled off under reduced pressure to obtain the polymerization product polymethyl acrylate. Take 90g of the obtained polymerization product polymethyl acrylate and add it to the reactor, then add 450g of water, 22.2g of sodium laurate, and 9.42g of isopropanol, raise the temperature to 50°C, stir for 10 minutes until it is evenly mixed, and then add dropwise 357.96g vinyl butyrate and 567g mass fraction of 5% potassium persulfate aqueous solution for 10 hours, continue the constant temperature reaction for 3 hours after the dropwise addition, lower the temperature to 25°C, add saturated sodium chloride solution to the obtained mixed emulsion to break the emulsion , and then ...

Embodiment 2

[0027] After the 40% by mass water reducer solution obtained in Example 1 was stored at 6° C. for 15 days, its implementation effect was measured.

Embodiment 3

[0029] First, add 300g of ethanol to the reactor, raise the temperature to 70°C, add 0.06g of isopropanol, then dropwise add the solution of 100g of ethyl acrylate and 8.2g of azobisisobutyronitrile for 8 hours, continue to After constant temperature reaction for 5 hours, ethanol was distilled off under reduced pressure to obtain polyethyl acrylate, a polymer product. Take 90g of the obtained polymerization product polyethyl acrylate and add it to the reactor, then add 4500g of water, 55.5g of sodium laurate, and 18.18g of n-dodecyl mercaptan, raise the temperature to 60°C, stir for 15 minutes until it is evenly mixed, Then 1026g of vinyl butyrate and 142.8g of 20% potassium persulfate aqueous solution were added dropwise for 8 hours. After the dropwise addition, the constant temperature reaction was continued for 5 hours, and the temperature was lowered to 30°C. In the mixed emulsion obtained, saturated chlorinated chloride was added. The calcium solution was demulsified, was...

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Abstract

The invention relates to a method for preparing a polycarboxylate superplasticizer by carrying out graft copolymerization on acrylic ester polymer and fatty acid vinyl ester. According to the method for preparing the polycarboxylate superplasticizer by carrying out graft copolymerization on the acrylic ester polymer and fatty acid vinyl ester, acrylic ester polymer and fatty acid vinyl ester are taken as main reaction raw materials, polymerization is carried out firstly, then grafting is carried out and then alcoholysis and hydrolysis are carried out to prepare the polycarboxylate superplasticizer grafted and polymerized with the acrylic polymer and fatty acid vinyl ester, namely acrylic ester is taken as a reaction monomer, polymerization is carried out under the actions of an initiating agent and a molecular weight regulating agent, then graft polymerization is carried out with the fatty acid vinyl ester to obtain a graft copolymer with the acrylic ester polymer as a main chain and polyvinyl ester fatty acid as a side chain, and finally alcoholysis and hydrolysis are carried out on the graft copolymer. The method for preparing the polycarboxylate superplasticizer by carrying out graft copolymerization on the acrylic ester polymer and fatty acid vinyl ester has the advantages that a process is simple and easy to control, cost is low, environmental protection is realized, no pollution is produced, the fatty acid vinyl ester is used for replacing the existing polycarboxylate superplasticizer, and diversification of raw materials is enriched; and the prepared superplasticizer has good cement paste fluidity and holding capability and shows good cement adaptability and concrete application property.

Description

technical field [0001] The invention relates to the technical field of a polycarboxylate water reducer for cement concrete, in particular to a polycarboxylate water reducer that uses acrylic monomers to self-polymerize first, then graft copolymerizes with fatty acid vinyl esters, and finally undergoes alcoholysis and hydrolysis to become The specific preparation method of the polycarboxylate water reducer with comb structure. 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 admixtures have become one of the essential components in the construction industry. The emergence of polycarboxylate superplasticizers, It solves the problems of low water-reducing rate and slow setting of the previous generation of lignosulfonate-based ordinary water-reducing agents, and makes up for the shortcomings of naphthalene-based water-reducing agents that pollute the environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/04C08F218/10C08F218/08C08F8/12C04B24/26C04B103/30
CPCC08F120/14C08F120/18C04B24/2641C04B2103/006C04B2103/32C08F265/06C08F8/12C08F265/04C08F218/12C08F216/06C08F218/08C08F218/10C08F8/06C08F265/00
Inventor 王子明赵明刘晓尹东杰刘玮李慧群
Owner GUIZHOU DR SHI TECH
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