Preparation method of modified PAE wet strength agent

A kind of PAE wet strength agent and modification technology, applied in the direction of reinforcement addition, etc., to achieve the effect of high wet strength and folding resistance

Inactive Publication Date: 2011-01-19
天津市奥东化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, when PAE is used alone, the wet strength increase value sometimes fails to meet the requirements of special paper, and it brings many adverse effects in the papermaking process, such as the slurry system is prone to air bubbles and flocculation, and it is difficult to peel off the paper. The uniformity of the page is poor, and too much addition may easily cause problems such as sticking to the cylinder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A preparation method of modified PAE wet strength agent, the steps are as follows:

[0014] 1.1. Synthesis of intermediates through polycondensation: react adipic acid and diethylenetriamine under the action of catalyst p-toluenesulfonic acid for 10 hours at 140°C to synthesize intermediate polyamides, in which adipic acid, diethylenetriamine The mass ratio of amine to p-benzenesulfonic acid is 1:1:0.005. During the reaction, the operator takes samples from the reactor, and the reaction is terminated when the extracts are continuously drawn.

[0015] 1.2. Synthesis of PAE by epoxidation reaction: at 40°C, with a pH value of 8, the above-mentioned intermediate polyamide was reacted with epichlorohydrin for 6 hours, wherein the mass ratio was 1:0.2, and the pH value of the material was monitored during the reaction. Ammonia water can be added for regulation if necessary.

[0016] 1.3. PAE modified by cross-linking reaction: After the above (1.2.) step epoxidation react...

Embodiment 2

[0018] The wet strength agent for papermaking in this experimental example is malonic acid, triethylenetetramine, epichlorohydrin, and polyethyleneimine as main raw materials, and is prepared by including the following main methods and steps.

[0019] 2.1. Synthesis of intermediates by polycondensation reaction: under the condition of 150°C, react with triethylenetetramine under the action of p-toluenesulfonic acid for 8 hours to synthesize intermediate polyamides, in which malonic acid, triethylenetetramine, p-toluene The mass ratio of sulfonic acid is 1:1.01:0.005. During the reaction, the operator takes a sample from the reactor, and the reaction is terminated when the extract is drawn continuously.

[0020] 2.2. Synthesis of PAE by epoxidation reaction: at 60°C and pH value of 9, react the above intermediate polyamide with epichlorohydrin for 6 hours, wherein the mass ratio is: 1:0.5, monitor the pH value of the material during the reaction , Ammonia water can be added f...

Embodiment 3

[0023] The wet strength agent for papermaking in this experimental example is polyamide epichlorohydrin modified by polyethyleneimine (PEI), that is, modified PAE. Its molecular chain has a three-dimensional network structure, and polyamide epichlorohydrin (PAE ) is obtained by the epoxidation reaction of polyamide synthesized by the polycondensation reaction of sebacic acid and tetraethylenepentamine and epichlorohydrin. Using sebacic acid, tetraethylenepentamine, epichlorohydrin, and polyethyleneimine (PEI) as main raw materials, it is prepared by including the following main methods and steps.

[0024] 3.1. Synthesis of intermediates by polycondensation reaction: Under the condition of 180°C, react sebacic acid and tetraethylenepentamine under the action of catalyst for 4 hours to synthesize intermediate polyamide, among which, sebacic acid, tetraethylenepentamine, p-toluenesulfonate The mass ratio of the acid is 1:1.2:0.015. During the reaction, the operator takes a sampl...

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PUM

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Abstract

The invention relates to a preparation method of a modified PAE wet strength agent, comprising the following steps of synthesizing polyamide used as an intermediate: reacting 1-1.2 percent of dicarboxylic acid with 0.005-0.02 percent of polyethylene polyamine for 2-10h under the action of a catalyst at the temperature of 140-200 DEG C; reacting 1 percent of the polyamide with 0.2-1 percent of chloroepoxy propane for 2-6h at the temperature of 40-80 DEG C with a pH value of 8-10; adding polymine and hexamethylene tetramine into the PAE, and continuously reacting for 0.5-1.5h; adding hydrogen peroxide after finishing the reaction, wherein the weight ratio of the PAE to the polymine to the hydrogen peroxide is 1:0.002-0.2:0.005-0.02, and the pH value is 2-5. The invention has the advantages that polyamide epichlorohydrin modified by a PEI crosslinking agent is used as a wet strength agent for papermaking, and the wet strength agent can be kept for a longer time without generating bubbles and flocculation and can enable a paper to have stronger wet strength and stronger folding endurance.

Description

technical field [0001] The invention belongs to papermaking industry additives, in particular to a preparation method of a modified PAE wet strength agent. Background technique [0002] The wet strength of paper wet strength refers to the strength of the paper after it touches water or absorbs water in a humid environment. In many paper products, especially industrial paper, decorative paper and fruit bag paper, higher wet strength is required. . The use of wet strength agents can improve the strength of paper when wet or wet. Generally, without adding wet strength agent, the strength of paper after soaking is only 3-10% of the strength of paper when it is dry, but after adding wet strength agent, it can maintain 20-40% of the original strength. There are two types of paper wet strength agents, namely temporary and permanent. The temporary type is used for a short time and discarded after use; the permanent type is used for corrugated paper, fruit bag paper and special p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/20
Inventor 田成杰李端于庆海吴连海
Owner 天津市奥东化工有限公司
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