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Moisture-proof packaging paper and preparation method thereof

A technology of wrapping paper and paper, applied in the direction of wrapping paper, wrapping paper, packaging, etc., can solve the problems of weak barrier, easy delamination, cracking, etc.

Active Publication Date: 2021-05-07
CHINA TOBACCO SICHUAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the surface of the double-layer film is a dense oil layer, its water vapor barrier is better than that of the emulsion film, but it is prone to delamination, cracking and other adverse phenomena
In contrast, emulsion films have higher physical strength but weaker barrier properties

Method used

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  • Moisture-proof packaging paper and preparation method thereof
  • Moisture-proof packaging paper and preparation method thereof
  • Moisture-proof packaging paper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Add 10 g of PVA0588 into 100 mL of deionized water, stir and dissolve at 90° C. for 6 h at a stirring speed of 200 rpm to obtain a PVA solution.

[0031] (2) Add 6 g of glyceryl tristearate (melting point 56° C.) and 0.9 g of Tween 80 (emulsifier) ​​to the obtained PVA solution, and emulsify for 2 h at a stirring speed of 1000 rpm.

[0032] (3) Use a high-shear emulsifier to homogenize the composite emulsion, control the shear speed to 20000 rpm, and shear the time for 3-5 minutes to obtain the composite emulsion.

[0033] (4) Coat the composite emulsion evenly on the wrapping paper, and dry it at different temperatures between room temperature and 150°C.

[0034] Observe the microscopic morphology of the coating at different drying temperatures by atomic force microscopy (AFM), select several typical temperature values, and the results are as follows figure 1 shown;

[0035] It can be seen from the figure that when the drying temperature is slightly higher than t...

Embodiment 2

[0041] (1) Add 5 g of PVA1799 to 100 mL of deionized water, stir and dissolve at 90° C. for 6 h at a stirring speed of 200 rpm to obtain a PVA solution.

[0042] (2) Add 5 g of beeswax (melting point 67° C.) and 0.1 g of cetyltrimethylamine bromide (emulsifier), and emulsify for 1 h at a stirring speed of 1000 rpm.

[0043] (3) Use a high-shear emulsifier to homogenize the composite emulsion, control the shear speed to 20000 rpm, and shear the time for 3-5 minutes to obtain the composite emulsion.

[0044] (4) Coat the composite emulsion evenly on the wrapping paper, and dry at 30°C, 60°C, 90°C and 120°C.

[0045] The water vapor transmission rate test was carried out on the coated paper at different drying temperatures, and the results are shown in the table below:

[0046]

[0047] It can be seen from the results that when the emulsion coating is dried at 90°C, the water vapor barrier property of the coated paper is the strongest.

Embodiment 3

[0049] (1) Take by weighing 4.8g of chitosan in a beaker, add 240mL of 2% acetic acid solution, then add 0.5g of glycerin, stir to make a concentration of 2wt% chitosan solution.

[0050] (2) Add 3 g of palm wax (melting point 85° C.), 0.3 g of Tween 80 and 0.15 g of Span 80 into the chitosan solution, and stir and emulsify at 90° C. for 2 hours at a stirring speed of 1200 rpm.

[0051] (3) The composite emulsion was homogenized by using a high-shear emulsifier, the shear speed was controlled at 22000 rpm, and the shear time was 3 minutes to obtain the composite emulsion.

[0052](4) After the composite emulsion is cooled to room temperature, soak the blank paper in the composite emulsion for 1 min to ensure that the paper sample fully absorbs the emulsion.

[0053] (5) The impregnated papers were divided into two groups, one group was dried at room temperature, and the other group was dried at 100°C.

[0054] The water vapor transmission rate test was carried out on two grou...

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Abstract

The invention discloses a preparation method of moisture-proof packaging paper, and the method comprises the following steps: adding a high-hydrophobicity natural grease material into a degradable polymer matrix solution with good film-forming property and water solubility, and adding an emulsifier to prepare a composite emulsion; employing the homogenized composite emulsion for paper coating, enabling grease to be enriched on the surface of a polymer matrix by controlling the drying temperature, and forming a similar double-layer coating structure, thereby improving the moisture resistance and physical strength of paper.

Description

technical field [0001] The invention relates to the technical field of wrapping paper, in particular to a moisture-proof wrapping paper and a preparation method thereof. Background technique [0002] Due to the characteristics of abundant resources, easy recycling and easy degradation, paper packaging materials are considered to be the most promising green packaging materials. However, due to its strong hydrophilicity and its physical properties are greatly reduced after moisture absorption, it cannot meet the packaging needs of food, cigarettes, medicines, precision instruments and other fields. At present, paper often achieves moisture-proof function through high water vapor barrier materials such as composite plastics and metals. However, these methods will cause paper to lose its original degradation and recyclability, resulting in waste of resources, environmental pollution and other problems. Therefore, it is of great significance to develop paper coating materials w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/10D21H21/16D21H19/14D21H19/20D21H19/18D21H19/34
CPCD21H27/10D21H21/16D21H19/14D21H19/20D21H19/18D21H19/34Y02W90/10
Inventor 吉笑盈李东亮黄馨施丰成耿宗泽
Owner CHINA TOBACCO SICHUAN IND CO LTD
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