Method for synthesizing liquid 3, 3 '-dichloro-4, 4'-diaminodiphenyl methane

By performing the condensation reaction under specific conditions and adding polyols or polyesters, the melting point of 3,3'-dichloro-4,4'-diaminodiphenylmethane is successfully reduced, making it a paste at room temperature, solving the energy waste and material performance problems caused by the high melting point of existing products, achieving a simpler production process and better market applicability.

CN119707704APending Publication Date: 2025-03-28SHANDONG CHONGSHUN NEW MATERIAL TECH CO LTD
0 Cites 0 Cited by

Patent Information

Application Number
CN202411910330.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing 3,3′-dichloro-4,4′-diaminodiphenylmethane products have a high melting point and require melting and insulation during use, resulting in waste of energy, and high temperatures will affect the performance and appearance of materials.

Method used

A liquid 3,3'-dichloro-4,4'-diaminodiphenylmethane synthesis method is adopted. By performing a condensation reaction under specific conditions and adding polyols or polyesters for mixing, the melting point of the product is reduced and the product is made into paste at room temperature.

Benefits of technology

The liquid state of the product is realized, the production process is simplified, the energy consumption is reduced, the tear strength of the product is improved, and it can be stored for a long time under room temperature, making it easy to use.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention belongs to the technical field of organic synthesis, and discloses a method for synthesizing liquid 3, 3 '-dichloro-4, 4'-diaminodiphenyl methane, which comprises the following steps: condensing o-chloroaniline and formaldehyde according to a molar ratio of 1: 0.55-1: 0.7 in 1 hydrochloric acid at 46-60 DEG C under the protection of nitrogen, then adding an assistant accounting for 0.3% of the mass of the formaldehyde, heating to 81-100 DEG C, stirring at the rotating speed of 60-70 rpm, carrying out heat preservation reaction for 1 hour, cooling to room temperature, and filtering, thereby obtaining the liquid 3, 3 '-dichloro-4, 4'-diaminodiphenyl methane. And neutralizing, washing, dehydrating and filtering to obtain a pasty 3, 3 '-dichloro-4, 4'-diaminodiphenyl methane product. And adding polyol or polyester into the product, and mixing to prepare a liquid mixture product which takes 3, 3 '-dichloro-4, 4'-diaminodiphenyl methane as a main material. The product is in a liquid state, is short in production process flow and convenient to use, and can better meet market requirements.
Need to check novelty before this filing date? Find Prior Art