High-solid content polyamide polyamine epichlorohydrin wet strength agent, as well as preparation and application thereof

Abstract

The invention discloses a high-solid content polyamide polyamine epichlorohydrin wet strength agent, as well as a preparation method and an application thereof. The preparation method comprises the following steps: performing condensation on a dibasic acid and a diamine under the action of an acidic catalyst to get a polyamide polyamine intermediate; enabling the polyamide polyamine intermediate, an organic chloride and a cation active monomer or a mixture of the cation active monomer and sodium hydroxide to perform nucleophilic addition reaction to get a high-viscosity cation polymer; and further adding water-soluble hydroxy amine to react and regulating pH with an acid to get the high-solid content polyamide polyamine epichlorohydrin wet strength agent. The obtained wet strength agent has the advantages of high solid content above 40% (in percentage by weight), high charge density, stability in storage, great wet-strengthening performance and few chlorine-containing byproducts, and can be applied in papermaking wet-end chemistry process.

Description

technical field [0001] The invention relates to a polyamide polyamine epichlorohydrin wet strength agent, in particular to a high solid content polyamide polyamine epichlorohydrin wet strength agent and a preparation method and application thereof. Background technique [0002] Polyamide polyamine-epichlorohydrin resin (PAE) is a thermosetting resin, which is usually added to the pulp making process as a wet strength agent. After molding and drying, paper with certain wet strength properties is obtained, such as: Toilet paper, diapers, map paper and paper bag paper with special performance requirements. The dosage of PAE is generally 0.1-0.5% of the absolute dry mass of the pulp, depending on the type of pulp, the ratio of long and short fibers, the final use of the paper, etc. After using PAE, the percentage of wet strength / dry strength of the paper is increased to 10-25 %, for paper products without PAE, the ratio of wet strength / dry strength is only a few percent. [00...

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Problems solved by technology

Ye Qingguo obtained a low-chlorine PAE wet strength agent with a solid content of 50-56% by low-temperature reaction and post-treatment by adding organic amines, but the preparation process was complicated and the preparation time was long, and the wet strength performance of the prepared product was not evaluated. (Ye Qingguo, Wang Sheng, "Chemical Reaction Engineering and Technology", Issue 4, 2006)

[0005] It can be seen that there are many studies on the preparation method of PAE, but to increase the solid content and obtain a high-performance wet strength agent, it cannot be solved only by the original technology.

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