Paper having enhanced dry strength and wet strength

A technology of dry strength and wet strength, applied in the direction of reinforcing agent addition, textile and papermaking, paper, etc., can solve the problems of low paper strength, environmental pollution, easy to break, etc.

Active Publication Date: 2014-03-19
ASIA SYMBOL GUANGDONG PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, some garbage bag products in daily life use paper bags, such as garbage bags on high-speed rail and airplanes, but they are all coated paper at present. The main reason is that the paper that has not been coated has low strength, and the strength is lower after being exposed to

Method used

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  • Paper having enhanced dry strength and wet strength
  • Paper having enhanced dry strength and wet strength
  • Paper having enhanced dry strength and wet strength

Examples

Experimental program
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Embodiment

[0064] The percentages in the examples are by weight. The dry breaking length is measured according to DIN53112sheet1. The wet breaking length is measured according to DIN53112sheet2.

[0065] Preparation of Acrylamide Graft Copolymerized Starch

[0066] Weigh a certain amount of starch (for example, obtained from Kemira Chemicals), add water, pass N in a water bath at 85°C 2 Stir and gelatinize for 1h, then add about 1wt% of initiator cerium ammonium nitrate and acrylamide, the mass ratio of starch to acrylamide is 1:1.5, react at 35°C for 3h, the grafting rate can reach 90%, and the solid content is 34 %, the viscosity is the acrylamide grafted co-polymerized starch A of 585mPa.s.

[0067] Preparation of urea glyoxal resin

[0068] The molar ratio of the total amount of glyoxal to urea is 1.5-2.0:1.0, the glyoxal is added in two times, the molar ratio of the first addition of glyoxal to the second addition of glyoxal is 9:1, the specific process It is prepared by the fo...

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Abstract

The invention relates to paper having enhanced dry strength and wet strength, which comprises a mixture of the following enhancers: a) amphoteric starch and/or graft copolymerization starch, b) urea glyoxal resin and c) polyvinylamine, wherein the three enhancers are added into the paper in a manner that the sum of the three enhancers accounts for 0.2-5% of the absolute dry weight of the paper. The invention also relates to an additive composition capable of simultaneously enhancing dry strength and wet strength of paper, which comprises: a) amphoteric starch and/or graft copolymerization starch, b) urea glyoxal resin and c) polyvinylamine, wherein the ratio of the three is preferably 2:2:1.

Description

technical field [0001] The present invention relates to papers having enhanced dry and wet strengths and methods for their manufacture. Background technique [0002] At present, some garbage bag products in daily life use paper bags, such as garbage bags on high-speed rail and airplanes, but they are all coated paper at present. The main reason is that the paper that has not been coated has low strength, and the strength is lower after being exposed to water, so it is easy to break. . Most of the products are packaged in plastic bags. Because coated paper and plastic bags are difficult to recycle and decompose, causing pollution to the environment, we produce environmentally friendly paper bag base paper that can be recycled and easily decomposed. [0003] Paper strength is usually characterized by its dry and wet strength, among other properties. Dry strength properties can be measured as a function of the tensile strength of dry paper sheets that are typically conditione...

Claims

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Application Information

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IPC IPC(8): D21H21/18D21H21/20D21H17/56
Inventor 李情兰王乐祥刘继春许正茂吴建辉
Owner ASIA SYMBOL GUANGDONG PAPER
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