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Paper-Making Aid Composition and Process for Increasing Tensile Strength of Paper

a technology of tensile strength and paper, applied in papermaking, non-fibrous pulp addition, reinforcing agent addition, etc., can solve the problems of mf resin and uf resin not being widely used, unable to retain 4%-10% of dry paper strength, and losing almost all mechanical strength of paper and paper boards. to achieve the effect of increasing dry strength and wet strength of paper

Inactive Publication Date: 2018-10-18
ECOLAB USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The inventors found that a specific combination of two types of resins, called polyamide polyamine-epichlorohydrin and anionic dialdehyde-modified polyacrylamide, when used together in a certain ratio, can significantly increase the strength of paper. This combination helps to make paper that is stronger both in dry and wet states. Other beneficial properties of paper, such as flexibility and smoothness, are not compromised.

Problems solved by technology

Furthermore, the paper and paper board will lose almost all mechanical strength after soaking in water and only 4%-10% of dry paper strength can be retained due to the interfiber bonding force from hydrogen bonding in celluloses.
MF resin and UF resin can't be used widely since each can only be used in acidic conditions and contains harmful and volatile formaldehyde.
Another type of wet strength agent, such as polyethyleneimine (PEI), has not been commercialized in a large scale due to the unrefined technology.
To some types of paper which requires a relatively high wet strength, the one-sided excessive addition of PAE resin cannot achieve the effect of imparting high wet strength.
Moreover, PAE resin has drawbacks including a long time for curing, difficult for waste paper recovery, high level of organochlorine, and not environmentally friendly.
However, this document does not pay special attention to the optimized combination of anionic GPAM with PAE resin.

Method used

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  • Paper-Making Aid Composition and Process for Increasing Tensile Strength of Paper
  • Paper-Making Aid Composition and Process for Increasing Tensile Strength of Paper

Examples

Experimental program
Comparison scheme
Effect test

preparation example

2. Preparation Example

[0088](a) Preparation of PAE resin

[0089]PAE resin used in the examples and comparative examples was polyamide polyamine epichlorohydrin, manufactured and sold by Nalco. Co., which was prepared according to the following process:

[0090]About 82 kg of diethylenetriamine, about 15 kg of distilled water and about 1 kg of p-toluenesulfonic acid were put into a reaction vessel. Then, about 110 kg of adipic acid was added portion-wise with stirring, and the mixed solution was allowed to automatically warm up to about 125° C. After fractionation of water, the system was further heated to about 150˜160° C., and kept the temperature for about 3 h. When the total amount of distillated water and amine was approximately 35 kg, the reaction tended to complete. Then, the system was cooled to below 100° C., and about 160 kg of water was added and stirred until a uniform bright red, transparent viscous liquid was obtained, having a solids content of about 50% and a viscosity (25...

example 1

[0101]The PAE resin solution and GPAM 2 were respectively diluted 15 times by adding the ionized water. The diluted PAE resin solution and GPAM2 solution were added into the furnish in sequence in an active concentration mass ratio of about 1.25:1. The interval of adding the components was about 60 s. The hand sheet samples of the invention were prepared according to the hand sheet preparation method as described above with two different dosages (about 3 kg / ton or about 6 kg / ton). The thick stock used in this Example was a mixed slurry of softwood bleached kraft pulp and hardwood bleached kraft pulp.

[0102]It should be noted that the dosage of the tested additive herein refers to the amount of the active ingredient in the solution (agent) relative to the dry fiber in the pulp slurry. The meaning of dosage also applies to the following examples. The composition and amount ratios of different paper-making aids used in the example and the measured properties were listed in Table 1.

TABLE...

example 2

[0104]The PAE solution and GPAM 2 were respectively diluted 15 times by adding the ionized water, and added into the furnish in sequence in different active concentration mass ratios (see Table 2 below). The interval of adding the components was about 60 s. The hand sheet samples of the invention were prepared according to the hand sheet preparation method as described above with two different dosages (about 2 kg / ton or about 4 kg / ton). The thick stock used in the Example was a mixed slurry of softwood bleached kraft pulp and hardwood bleached kraft pulp.

TABLE 2Optimization of the combination of PAE resin and GPAM2WetDryPaper-makingDosageWettensileDrytensileaidof thetensilestrengthtensilestrengthcompositionaidstrength,increase,strength,increase,(PAE:GPAM2)kg / tN · m / g%N · m / g%Blank01.7933.171:024.75165.434.95.21:046.34254.236.9411.40:121.948.433.08−0.30:142.2324.634.353.63.5:1 24.89173.236.048.73.5:1 46.87283.839.7819.92:124.61157.535.577.22:147.2302.240.221.21:124.78167.036.39.41:14...

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Abstract

A paper-making aid composition, as well as processes for increasing tensile strength in paper and paper-making processes are provided. The paper-making composition comprises an anionic dialdehyde-modified polyacrylamide and a polyamide polyamine-epichlorohydrin (“PAE”) resin present in the paper-making aid composition at a weight ratio of PAE resin to anionic dialdehyde-modified polyacrylamide of from about 5:1 to about 1:1.6. The processes utilize an anionic dialdehyde-modified polyacrylamide and PAE resin at certain ratios. The anionic dialdehyde-modified polyacrylamide and PAE resin may be added to the pulp slurry as a composition or separately.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to Chinese Patent Application Serial No. 201410698600.X filed on Nov. 27, 2014, the disclosure of which is incorporated herein by reference in its entirety.TECHNICAL FIELD OF THE INVENTION[0002]The present invention, which is in the field of paper-making process, relates to a paper-making aid composition and its preparation process, to a process for increasing tensile strength, especially dry tensile strength and wet tensile strength of paper, and to a paper-making process.BACKGROUND OF THE INVENTION[0003]Strength (including dry strength, wet strength and temporary wet strength, etc.) is a structural property of paper, which mainly depends on the interfiber bond and the nature of fibers in the paper sheet. During the paper making process, the strength properties of paper can be improved by adding strength agents to the paper stock by adjusting the ratio of fibers and pulping to fibrillate as well as by virt...

Claims

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Application Information

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IPC IPC(8): D21H17/37D21H17/38D21H17/43D21H17/55D21H21/20D21H23/28
CPCD21H17/375D21H17/38D21H17/43D21H17/55D21H21/20D21H23/28D21H17/42D21H17/45D21H17/56D21H21/18
Inventor XU, NAZHANG, MENGZHAO, YULIN
Owner ECOLAB USA INC