Method for preparing methyl allyl alcohol polyoxyethylene ether

A technology of methallyl alcohol polyoxyethylene ether and methallyl alcohol, which is applied in the field of preparation of methallyl alcohol polyoxyethylene ether, can solve the limitation of conversion rate, grafting rate, polycarboxylic acid molecular weight and The molecular structure is difficult to meet the design requirements, etc., to achieve the effect of increasing the degree of unsaturation

Inactive Publication Date: 2011-07-27
SHANGHAI DUOLUN CHEM
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  • Abstract
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AI Technical Summary

Problems solved by technology

The degree of unsaturation reflects the density of double bonds, and the lower degree of unsaturation will limit the conversion rate and grafting rate of further copolymerization of methallyl alcohol polyoxyethylene / polyoxypropylene ether with unsaturated compounds. It will make it difficult for the molecular weight and molecular structure of polycarboxylic acid to meet the design requirements

Method used

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  • Method for preparing methyl allyl alcohol polyoxyethylene ether
  • Method for preparing methyl allyl alcohol polyoxyethylene ether
  • Method for preparing methyl allyl alcohol polyoxyethylene ether

Examples

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Embodiment 1～10

[0019] The polymerization reaction was carried out in a tank reactor with a volume of 4 L equipped with a stirring and heating device. First replace the air in the reactor with nitrogen, add 72g of methallyl alcohol, and add the required amount of catalyst. Then replace the air in the reactor with nitrogen at room temperature, start stirring, heat up to the set reaction temperature, then feed the required amount of ethylene oxide (EO) gas, and simultaneously control the system pressure to the set value. Maintain the set reaction temperature for aging reaction until the set reaction time is reached to end the polymerization reaction.

[0020] After the polymerization reaction, neutralize the product with acetic acid, filter the product with a liquid filter bag with a precision of 35-75 μm after cooling, and remove the solid matter to obtain the methallyl alcohol polyoxyethylene ether product.

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Abstract

The invention discloses a method for preparing methyl allyl alcohol polyoxyethylene ether. In the method, methallyl alcohol and ethylene oxide undergo a polymerization reaction in the presence of a catalyst to form the methyl allyl alcohol polyoxyethylene ether. The catalyst is sodium methyl allyl alcohol or potassium methyl allyl alcohol; the molar charge ratio of the methallyl alcohol to the ethylene oxide is 1.0:(5.0-78.0); the amount of the catalyst is 0.10 to 0.60 weight percent based on the methallyl alcohol; and the reaction pressure is 0.10 to 0.40MPaG, the reaction temperature is 50 to 150 DEG C, and the reaction time is 3 to 7 hours. The key technical point of the method is that the instauration of the product is increased by over 10 percent by using the more ideal catalyst. The method can be used for preparing methyl allyl alcohol polyoxyethylene ethers with a weight-average molecular weight of 150 to 6,000.

Description

technical field [0001] The invention relates to a preparation method of methallyl alcohol polyoxyethylene ether, in particular to a method for preparing methallyl alcohol polyoxyethylene ether by polymerization reaction using methallyl alcohol and ethylene oxide as raw materials. Background technique [0002] Polycarboxylate-based concrete water-reducing agents have many advantages such as high efficiency, non-toxicity, non-pollution, and environmental friendliness. Polycarboxylate-based concrete water-reducing agents usually use allyl polyoxyethylene / polyoxypropylene ether as the main unit It is prepared by copolymerization with unsaturated compounds such as maleic anhydride, acrylic acid, sodium allyl sulfonate, methacrylic acid or styrene. The polyoxyethylene / polyoxypropylene ether with branched chain (typically such as methallyl alcohol polyoxyethylene ether) is the fourth-generation polycarboxylic acid developed in recent years. It is a water reducing agent, which has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C07C43/16C07C41/03
Inventor 徐兴建舒建生朱学文
Owner SHANGHAI DUOLUN CHEM
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