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Completely biodegradable waterproof paper

A biodegradable, waterproof paper technology, applied in papermaking, paper coatings, textiles and papermaking, etc., can solve the problems of white pollution, difficult to biodegrade, not completely biodegradable, etc., and achieve good hydrophobicity and good adhesion. Effect

Active Publication Date: 2015-02-18
EASTERN LIAONING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We know that both polyethylene and polypropylene are petrochemical products, which have high stability and are difficult to biodegrade. Even if they are filled with starch, they can only disintegrate (turn into pieces) during long-term storage. Its fragments can exist in the natural environment for hundreds of years, so the above two kinds of waterproof paper cannot be completely biodegraded when discarded, and will form white pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 cellulose ester coating (dipping method)

[0019] Dissolve cellulose laurate in dichloromethane to form a solution with a concentration of 1mg / mL. Immerse plain paper in the solution for 30 seconds, take it out and dry it naturally. The thickness of the coating formed on the surface is 3nm (measured by atomic force microscope AFM) ), the weight gain ratio is 11%, the measured contact angle (static contact angle meter) is 88°, and the paper contact angle is 25°. Put the dried paper horizontally into water and soak for 1 minute, take it out and weigh it, the weight gain ratio is 47.6%, which is lower than the water absorption weight gain ratio of untreated paper 176.3%. In the case of water immersion, the strength of waterproof paper does not decrease, while the strength of ordinary paper is already very low, and almost completely loses its strength. After natural drying at 30°C, the weight and shape of the waterproof paper were completely recovered, while t...

Embodiment 2

[0028] Embodiment 2 cellulose ester coating (dipping method)

[0029] Cellulose laurate is dissolved in chloroform to form a solution with a mass concentration of 3 mg / mL, the paper is immersed in the solution for 30 seconds, taken out and dried naturally, the thickness of the coating formed on the surface is 6nm measured by atomic force microscope (AFM), increasing The weight ratio was 24%, and the measured contact angle (static contact angle meter) was 95°. Put it horizontally into water and soak for 1 minute, take it out and weigh it, the weight gain ratio is 20.8%, which is far lower than the weight gain ratio of untreated paper which is 176.3%. In the case of water immersion, the strength of waterproof paper does not decrease, while the strength of ordinary paper is already very low, and almost completely loses its strength. After natural drying at 30°C, the weight and shape of the waterproof paper were completely recovered, while the weight of the ordinary paper was rec...

Embodiment 3

[0030] Embodiment 3 cellulose ester coating (dipping method)

[0031] Cellulose palmitate was dissolved in chloroform to form a 50mg / mL solution, and the paper was horizontally immersed in the solution for 20s, 40s, 60s and 3min respectively. The results are shown in Table 2. In the case of water immersion, the strength of waterproof paper does not decrease, while the strength of ordinary paper is already very low, and almost completely loses its strength. After natural drying at 30°C, the weight and shape of the waterproof paper were completely restored. Although the weight of the ordinary paper recovered, it was seriously warped and deformed. The details are shown in Table 2:

[0032] Table 2 Example 5 Dip Coating Example

[0033] serial number

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Abstract

The invention relates to novel completely biodegradable waterproof paper. The waterproof paper especially is waterproof paper and various kinds of packing paper, on surface of which pens can write and characters or patterns can be printed. The waterproof paper contains paper and its surface coating a polysaccharide ester film. A preparation method of the waterproof paper is coating technologies such as an impregnation method, a spray method, a scraping method and the like. The polysaccharide ester used contains cellulose ester, starch ester and bacterial polysaccharide ester (such as dextran ester). A solvent of the prepared coating contains polar / nonpolar organic solvents such as chloroform, dichloromethane, acetone, toluene and the like. The waterproof paper is water-repellent and has good writing ability and printability. Meanwhile, the selected raw materials have excellent biodegradability such that complete biodegradation can be realized under a specific condition. Thus, the waterproof paper has an excellent function of environmental protection.

Description

technical field [0001] The invention belongs to the technical field of waterproof paper manufacture, and in particular relates to a completely biodegradable waterproof paper. Background technique [0002] The role of paper in production and life is unquestionable. It is a carrier for storing knowledge, and it can also be used as a decoration material, packaging material, etc. Ordinary paper is mainly prepared from cellulose. Even if some specific paper-making additives are added, its biodegradability is still outstanding. Under certain conditions, the cellulose in paper can be completely degraded after a certain period of time. . Because cellulose itself has a large number of hydroxyl groups, which can form hydrogen bonds with water, causing the paper to have moisture absorption properties, the waterproof performance of ordinary paper is very low. Once the paper absorbs moisture and water, on the one hand, the strength of the paper will be reduced sharply, or even directly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/14D21H19/14
Inventor 吴晓杰黄凤远
Owner EASTERN LIAONING UNIV
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