Prepn process of 4,4'-methylene-bis(3-chloro-2,6-diethyl aniline) (MCDEA)

Abstract

The preparation process of 4, 4'-methylene-bis-(3-chloro-2, 6-diehtyl aniline) (MCDEA) belongs to the field of polymer synthesis technology. Under the protection of inert gas, material 3-chloro-2, 6-diehtyl aniline is reacted with hydrochloric acid in water solution to produce 3-chloro-2, 6-diehtyl aniline hydrochloride. Then, water solution of formaldehyde is dropped while heating to produce condensation; and through maintaining the temperature for finishing the reaction and neutralization with alkali, coarse MCDEA product is separated. Through further decolorizing, dewatering, crystallizing and pelletizing, MCDEA product is obtained. The preparation process is simple and has mild reaction condition, low production cost and high yield, and MCDEA has micro toxicity and may be used to replace MOCA as chain expander for PU material.

Description

technical field

[0001] The invention belongs to the field of polymer material synthesis, and relates to a preparation method of chain extender 4,4'-methylene-bis-(3-chloro-2,6-diethylaniline) [MCDEA] for polyurethane synthesis. Background technique

[0002] The research and development of polyurethane (referred to as PU) materials has a history of more than 60 years. In the past 40 years, all kinds of PU materials have developed rapidly, and the output has increased by more than 2,000 times. In the past 20 years, the output of PU materials in my country has also increased by more than 20 times. With the continuous expansion of the application of PU materials, the number of its products has jumped to the top of the world's six major synthetic materials, and the global output is about 10 million tons.

[0003] Due to its excellent performance, PU materials are widely used in various fields of the national economy and in all aspects of people's basic necessities of life. Such...

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