Prepn process of epichlorohydrin wet strength agent for polyamide and polyamine

Abstract

The preparation process of polyamide-polyamine epichlorohydrin wet strength agent for papermaking includes two steps of synthesizing polyamide-polyamine and synthesizing ultimate product. The preparation process of polyamide-polyamine epichlorohydrin includes adding polyamine into the first reactor, heating, adding adipic acid and catalyst through stirring, adding water for diluting and other steps to obtain polyamide-polyamine; adding polyamide-polyamine solution into the second reactor, dropping epichlorohydrin while stirring, heating, reflux, adding catalyst, adding water for diluting, and adding HCl to regulate pH value to 7-8 while stirring to obtain product.

Description

technical field [0001] The invention relates to a method for preparing a wet strength agent for papermaking, in particular to a new method for preparing a polyamide polyamine epichlorohydrin wet strength agent. Background technique [0002] In the past, the paper industry usually used urea-formaldehyde resin or melamine-formaldehyde resin as a wet strength agent to improve the wet strength of paper. In addition to their poor performance and poor stability, these two wet strength agents are required to make paper under acidic conditions, which seriously corrodes the equipment, and more prominently causes serious environmental pollution in the paper industry, which has become more and more serious. The more it does not adapt to the environmental requirements of the era of knowledge economy in the 21st century, and because of this, it cannot meet the requirements in the production of paper for hygiene, medicine, and food industries, which seriously restricts the production and ...

AI Technical Summary

Problems solved by technology

In recent years, a polyamide epichlorohydrin wet strength agent has come out, and its trade name is PAE resin. Although it has the characteristics of excellent performance, little pollution, non-toxicity, and papermaking at any pH value, it combines the technology of wet strength agent products The performance has been improved to a new level, but due to the use of diethylene polyamines as raw materials in the preparation process, the price of the product is expensive, which in turn leads to high papermaking costs, making small and medium paper mills daunted, helpless in the production of filter paperboard and other products At present, melamine formaldehyde resin is still used as the wet strength agent, which limits its popularization and application, and can only be used in a small number of special papers.

In addition, due to its high post-curing temperature and high energy consumption, it often produces seersucker paper defects when making paper, which is not satisfactory. These disadvantages urgently need to be further improved.

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