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Paper fold-resistance reinforcing agent and preparation method thereof

A technology of strengthening agent and folding resistance, applied in the field of preparation of paper strengthening agent, can solve the problems of complex production process of wood pulp ratio, high production cost, multiple wood resources, etc., achieve excellent film-forming properties, improve ring compressive strength and Bursting strength, good affinity effect

Inactive Publication Date: 2016-05-18
DSSUN NEW MATERIAL SHANDONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional production method of kraft liner is to increase the amount of liner, that is, to increase the proportion of wood pulp, to improve the surface strength and folding resistance of the paper, so it requires higher production costs and consumes more wood resources. The increase of the pulp ratio brings the complexity of the production process

Method used

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  • Paper fold-resistance reinforcing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add 10g sodium hydroxide and 50g sodium hypochlorite (9% available chlorine) in 1000g water, stir until there is no insoluble matter, add cornstarch 200g (moisture is 13%) while stirring, obtain starch milk after stirring, Heat to 95°C, heat-preserve and gelatinize for 10 minutes, then add 14.5g of 3-chloro-2-hydroxypropyltrimethylammonium chloride solution (mass concentration is 69%), continue to react at 95°C for 60 minutes, and obtain amphoteric starch solution ;

[0032] (2) Add 5.22 g of polyamide polyamine epoxy resin to (1), and react at 95° C. for 30 minutes; reduce the system temperature to 80° C.;

[0033] (3) Add 8.7 g of cationic polyacrylamide to (2), react at 80°C for 60 minutes, and cool down to room temperature to obtain a folding strength enhancer.

Embodiment 2

[0035] (1) In 1000g of water, add 30g of sodium hydroxide and 10g of potassium persulfate, stir evenly until there is no insoluble matter, under stirring, add 150g of tapioca starch (moisture is 13%), stir to obtain starch milk, add Raise the temperature to 80°C, heat-preserve and gelatinize for 20 minutes, then add 20g of 2,3-epoxypropyltrimethylammonium chloride (mass concentration: 50%), and continue the reaction at 80°C for 30 minutes to obtain an amphoteric starch solution;

[0036] (2) Add 7.83 g of polyamide polyamine epoxy resin to (1), and react for 40 minutes at 80° C.;

[0037] (3) Add 27.84 g of anionic polyacrylamide to (2), react at 80° C. for 60 minutes, and cool down to room temperature to obtain a folding strength enhancer.

Embodiment 3

[0039] (1) add 10g sodium hydroxide and 40g sodium hypochlorite (9% available chlorine) in 1000g water, stir until there is no insoluble matter, add potato starch 200g (moisture is 13%) while stirring, obtain starch milk after stirring, Heat to 70°C, heat-preserve and gelatinize for 30 minutes, then add 20g of N-(2,3-epoxypropyl)diethylamine solution (mass concentration: 69%), continue to heat-retain at 70°C for 60 minutes, and obtain amphoteric starch solution ;

[0040] (2) Add 10.44 g of polyamide polyurea cyclic resin to (1), heat-retain and react at 70°C for 60 minutes, then cool down to 60°C;

[0041] (3) Add 17.4 g of amphoteric polyacrylamide to (3), heat-retain and react at 60°C for 90 minutes, and cool down to room temperature to obtain a folding strength enhancer;

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Abstract

The invention provides a preparation method of a paper fold-resistance reinforcing agent. The method comprises the following steps: 1, mixing starch, water, hydroxide, hypochlorite or persulfate, and a cationic etherifying agent and reacting to prepare amphoteric starch; 2, mixing resin and the amphoteric starch and reacting at 70-95 DEG C for 30-60 min; and 3, mixing a product obtained in the Step 2 and polyacrylamide and reacting at 60-80 DEG C for 30-120 min so as to obtain the fold-resistance reinforcing agent. On the precondition of reducing the wood-pulp ratio of slurry, by surface sizing or coating of the fold-resistance reinforcing agent prepared by the method, fold resistance of paper is raised. Meanwhile, in comparison with a traditional technology, surface strength is enhanced; and in comparison with the prior art, fold resistance and surface strength are both greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a paper strengthening agent, in particular to a preparation method of a paper folding strength strengthening agent. Background technique [0002] In the paper industry, market competition is increasingly fierce, how to improve product quality and production cost is the core issue of the paper industry, among which, the dry strength of paper is one of the structural characteristics of paper. [0003] The dry strength of paper is mainly obtained with the formation of fiber network and bonding between fibers after drying. In fact, the strength of paper mainly depends on the strength of individual fibers and the degree of bonding between fibers, the number, the distribution of fiber bonds, and so on. The strength of the fiber network can be improved by mechanical beating and refining, because the number of fine fibers increases after increasing the degree of beating, thereby increasing the formation of bond...

Claims

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Application Information

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IPC IPC(8): D21H21/18
Inventor 施晓旦李改霞
Owner DSSUN NEW MATERIAL SHANDONG
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