Compounding method of allyl polyoxyethylene methyl acrylate

A technology of polyethylene glycol acrylate and a synthesis method, which is applied in the field of synthesis of allyl polyethylene glycol acrylate, can solve the problems of solvent pollution, complex production process, difficult control and the like, and achieves reasonable reaction conditions, Highly reactive, easy-to-control effects

Inactive Publication Date: 2009-09-30
JIAHUA CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of this synthetic method is complex, not easy to control, and the removed solvent will seriously pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 124 parts of allyl polyethylene glycol with a polymerization degree of 25 from the first port of the three-necked flask, start stirring, and then add 500 parts of acrylic acid, 13 parts of p-toluenesulfonic acid, and 0.5 part of phenothiazine, and then the first port Close; on the second port of the three-necked flask, connect the condensing tube reflux device and the water separating device in turn; connect the dry air inlet pipe on the third port of the three-necked flask. Raise the temperature to 130°C and react for 6 hours. During the reaction, the air dried on silica gel added from the dry air inlet pipe entrains esterified water and unreacted acrylic acid, and is extracted by the reflux device of the condenser tube, and the acrylic acid in it is refluxed into the flask. The remaining esterification water is taken out through the water separation device. Cool down to obtain allyl polyethylene glycol acrylate.

Embodiment 2

[0018] Add 180 parts of allyl polyethylene glycol with a polymerization degree of 15 from the first port of the three-necked flask, start stirring, then add 400 parts of acrylic acid, 23 parts of p-toluenesulfonic acid, and 0.18 parts of phenothiazine, and then close the first port ; On the second port of the three-necked flask, connect the condenser tube reflux device and the water dividing device in turn; connect the dry air inlet pipe on the third port of the three-necked flask. Raise the temperature to 110°C and react for 6.5 hours. During the reaction, the air dried on silica gel added from the dry air inlet pipe entrains esterified water and unreacted acrylic acid, and is drawn out by the reflux device of the condenser tube, and the acrylic acid in it is refluxed into the flask , and the remaining esterification water is taken out through the water separation device. Cool down to obtain allyl polyethylene glycol acrylate.

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Abstract

The invention discloses a compounding method of allyl polyoxyethylene methyl acrylate, which uses propyl ethylene polyoxyethylene and crylic acid as raw materials. The raw materials are subjected to esterification reaction under the function of a toluenesulfonic acid catalyst and a thiodiphenylamine polymerization resistor, and air dried by silicon gel is supplied to bring out the water generated by the reaction. The invention has the advantages that in the reaction process, the dried air is used for bringing out the water generated by the reaction, the reaction cost is effectively lowered, wet air is discharged, and the environmental pollution is avoided; the paratoluenesulfonic acid is used as the catalyst, the thiodiphenylamine and the oxygen molecules in the air are used as the polymerization resistor, the reaction condition is reasonable, the reaction time is short and the process is simple and easy to control; the allyl polyoxyethylene methyl acrylate compounded by the method has the characteristics of high unsaturation degree, high esterification degree, high reaction activity, and the like, and is suitable for the compounding field of high-performance polycarboxylic-acid water reducer.

Description

1. Technical field [0001] The invention belongs to the technical field of ester synthesis, in particular to a method for synthesizing allyl polyethylene glycol acrylate 2. Background technology [0002] Allyl polyethylene glycol acrylate is a new type of active macromonomer of polycarboxylate water reducer. Polycarboxylate superplasticizer is the third generation superplasticizer developed after the first and second generation high-efficiency superplasticizers, and is called high-performance superplasticizer. Compared with other water-reducing agents, polycarboxylate-based water-reducing agents have the following advantages: 1. It has super-dispersion properties for cement molecules, and the water-reducing rate is much higher than that of ordinary water-reducing agents; 2. The concrete has high fluidity and small collapse damage ; 3. The adaptability to cementitious materials is better than other types of water reducing agents; 4. It is suitable for pouring waterproof and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06
Inventor 李金彪曲亚明崔治君何志刚
Owner JIAHUA CHEM
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