Method for synthesizing polyethyleneglycol monomethyl ether metacrylic acid ester

A technology of polyethylene glycol monomethyl ether and methacrylate, which is applied in the field of synthesis of polyethylene glycol monomethyl ether methacrylate, can solve the problems of low esterification rate and Michael addition side reactions, which are difficult to avoid Polymerization and other problems, to achieve the effect of simple steps, increase the rate of esterification, avoid polymerization and other side reactions
CN101289533AInactive Publication Date: 2008-10-22SUN YAT SEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUN YAT SEN UNIV
Publication Date
2008-10-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for synthesizing poly (ethylene glycol) methyl ether methacrylate. Methyl methacrylate and PGME are synthesized to generate the poly (ethylene glycol) methyl ether methacrylateby through the ester exchange reaction. The catalyst used in the ester exchange reaction is a base catalyst and has high catalytic activity; an inhibitive substance is added in the reaction system to avoid the polyreaction in the process of reaction and air is put into the reaction system; the reaction temperature is moderate and is between 80 and 85 DEG C; the reaction side product of methanol and a reaction medium form an azeotrope which is taken out of the reaction system, thereby ensuring that the reaction is done completely. The method quantificationally converts the PGME into the poly (ethylene glycol) methyl ether methacrylate, has esterification rate close to 100 percent, avoids the polyreaction and other side reactions, has simple steps and is suitable for the industrial production.
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Description

technical field

[0001] The invention belongs to the technical field of chemical synthesis, in particular to a method for synthesizing polyethylene glycol monomethyl ether methacrylate. technical background

[0002] Polyethylene glycol monomethyl ether methacrylate has many important applications, such as: (1) As a macromer, it is used as a high-performance polycarboxylate water reducer with important application value in cement and concrete engineering Synthesis is the most important and main raw material for determining the performance of polycarboxylate superplasticizers. The degree of esterification during the synthesis of the macromonomer directly affects the performance of the final polycarboxylate superplasticizer product; (2) As a reactive nonionic emulsifier used in emulsion polymerization, it can make the obtained emulsion have very good mechanical stability and stability to metal salts, and can make the stability of the prepared emulsion not affected by pH changes,...

Claims

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