Preparation method of acrylamide cross-linked urea glyoxal resin wet strength agent

Abstract

The invention relates to a preparation method of acrylamide cross-linked urea glyoxal resin wet strength agent. The preparation method is characterized by comprising the following steps: mixing glyoxal and urea as per mole ratio of 1 to 2: 0.3 to 1, regulating pH value to be 1.5 to 3 with acid, reacting for 2.5 to 6 h under the temperature of 35 DEG C to 75 DEG C, cooling, regulating pH value to be neutral with alkali after adding the glyoxal with the adding amount of moles of 15% to 40 % of first glyoxal weight, reacting for 1 to 2 h under the temperature of 20 DEG C to 35 DEG C, regulating pH value to be neutral so as to obtain urea resin, adding cross-linking monomers and cation monomers into the urea resin (the mole ratio of the cross-linking monomers, the cation monomers and the urea is 0.5 to 3.5:0.2 to 2:5, reacting for 1 to 2 h under the temperature of 50 DEG C to 80 DEG C, and adding deionized water for dilution until the solid content occupies 12% of total content so as to obtain acrylamide cross-linked urea glyoxal resin wet strength agent. The invention has the benefits that formaldehyde and organic halide are not added during preparation process, so that damage to environment and human health is eliminated.

Description

technical field [0001] The invention belongs to a wet strength agent for papermaking, in particular to a preparation method of an acrylamide crosslinked urea glyoxal resin wet strength agent. Background technique [0002] With the rapid development of the paper industry, the traditional wet strength agents used in the paper industry, such as urea-formaldehyde resin (UF) and melamine-formaldehyde resin (MF), have become less and less suitable due to the use conditions and the release of harmful substances (A0X). Meet the needs of users. [0003] PAE is currently the most widely used wet strength agent for papermaking. Its performance has been widely recognized and has become the mainstream product of wet strength agent. However, it is easily affected by the reaction conditions during the preparation process, such as high production temperature, long time, The volatilization of raw materials is serious, the ratio reaction of raw materials is lower than the theoretical reactio...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the paper industry, the traditional wet strength agents used in the paper industry, such as urea-formaldehyde resin (UF) and melamine-formaldehyde resin (MF), have become less and less suitable due to the use conditions and the release of harmful substances (A0X). Meet the needs of users

[0003] PAE is currently the most widely used wet strength agent for papermaking. Its performance has been widely recognized and has become the mainstream product of wet strength agent. However, it is easily affected by the reaction conditions during the preparation process, such as high production temperature, long time, The volatilization of raw materials is serious, the ratio reaction of raw materials is lower than the theoretical reaction value, etc., which can easily lead to premature termination of end groups in the polycondensation process, resulting in low molecular weight of polymers, affecting the use effect, and bringing many adverse effects to papermaking, such as polycondensation The material is prone to air bubbles, flocculation, difficulty in paper forming and peeling, poor paper uniformity, etc.

At the same time, the more critical issue is that the currently widely used PAE wet strength agent is not suitable. The United Nations Health Organization has formulated requirements. By 2015, paper products are not allowed to use chemical raw materials containing organic halides (AOX).