Method for preparing organosilicon modified paper sheet humidifying strong agent

Abstract

The invention discloses a preparation method of a paper wet strengthening agent that is modified by organic silicon, which comprises the following steps: firstly combines the raw materials of dibasic acid and polyhydric amine into a polyamine intermediate compound of daiamid. A certain amount of the polyamine intermediate compound of daiamid, epoxy chloropropane and an organosilane coupling agentare taken to react under certain temperature so as to achieve certain viscosity, and the reaction is halted by adding acid, thus obtaining the paper wet strengthening agent that is modified by organic silicon. The preparation method of the paper wet strengthening agent that is modified by organic silicon can reduce the usage of the epoxy chloropropane and lower the organic chlorine content in discharged substances; the cross-linked product greatly increases molecular weight and active crosslinking points of molecular chain sections. The product of the paper wet strengthening agent that is modified by organic silicon achieves greatly raised retention degree, can improve not only the wet strength of paper but also the paper physical performance such as folding resistance, tensile strength and dry strength, etc., and the superficial water-proof performance of paper can be greatly raised if the paper wet strengthening agent is coated on the surface of paper.

Description

technical field [0001] The invention belongs to the field of preparation technology of fine chemicals, and in particular relates to a preparation method of an organosilicon-modified paper moisturizing strength agent. Background technique [0002] Many paper products, especially industrial papers, require high wet strength. Polyamide polyamine epichlorohydrin (PAE), as the most widely used wet strength agent at present, has advantages that cannot be compared with traditional wet strength agents urea-formaldehyde resin (UF), modified melamine-formaldehyde resin (MF) and acrylamide polymers . It not only has good wet strength effect and repulpability, but also has no free formaldehyde in the production process, which is friendly to the ecological environment and human health. The existing PAE preparation method is usually prepared by reacting adipic acid and diethylenetriamine or triethylenetetramine under alkaline conditions to prepare polyamine, and then reacting with epich...

AI Technical Summary

Problems solved by technology

Since this type of product has not been cross-linked and modified, its cross-linking degree and molecular weight are low, and its retention performance is poor. The wet strength effect of the paper is far from the production requirements, especially for some paper types that require high wet strength. It is still not ideal; at the same time, it will bring many adverse effects to the papermaking, such as the pulp is easy to produce air bubbles, flocculation, poor paper uniformity, low rigidity, etc.