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Method for improving water vapor barrier property of food packaging paper under high temperature and high humidity

A water vapor barrier, high temperature and high humidity technology, applied in wrapping paper, wrapping paper, packaging, etc., can solve problems such as low moisture resistance, difficulty in guaranteeing green environmental protection performance, food quality and shelf life, etc.

Active Publication Date: 2021-06-04
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a green and environmentally friendly material, cellulose paper is widely used in various fields, but its moisture-proof performance is low under high temperature and high humidity, which has a serious impact on the quality and shelf life of food
At present, the moisture-proof treatment of paper is generally made of paper-plastic or paper-metal composite materials, which have an obvious effect of blocking water vapor, but it is difficult to guarantee the green performance of plastic / metal-paper

Method used

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  • Method for improving water vapor barrier property of food packaging paper under high temperature and high humidity
  • Method for improving water vapor barrier property of food packaging paper under high temperature and high humidity
  • Method for improving water vapor barrier property of food packaging paper under high temperature and high humidity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Coating of physically cross-linked polyvinyl alcohol / nanoclay / alkali lignin composite gel (20:1:1) reduces the water vapor transmission rate of paper.

[0022] method:

[0023] Mix polyvinyl alcohol, nanoclay and alkali lignin at a volume ratio of 20:1:1 at a volume ratio of 2.0 wt%, and crosslink for 2 hours by adding borax to obtain a composite gel. The composite gel is coated on the surface of paper, and dried under normal pressure to obtain coated paper. According to the TAPPI T448om-09 standard method, the water vapor transmission rate of the paper at 23°C, 50% relative humidity (RH) and 38°C, 90% RH were respectively measured.

[0024] The experimental results are shown in Table 1:

[0025] The water vapor transmission rate of the reference sample at 23°C, 50%RH and 38°C, 90%RH are 512g / m 2 / d and 1861g / m 2 / d. When the PVA / NC / AL composite gel (20:1:1) is coated on the paper surface with an amount of 4g / m 2 , the water vapor transmission rate of c...

Embodiment 2

[0029] Example 2: Coating of physically cross-linked polyvinyl alcohol / nanoclay / alkali lignin composite gel (10:1:1) reduces the water vapor transmission rate of paper.

[0030] method:

[0031] Same as Example 1, the difference is that polyvinyl alcohol, nanoclay and alkali lignin are mixed in a volume ratio of 10:1:1.

[0032] The experimental results are shown in Table 2:

[0033] When the PVA / NC / AL composite gel (10:1:1) is coated on the paper surface with an amount of 4g / m 2 , the water vapor transmission rate of the coated paper at 23°C, 50%RH and 38°C, 90%RH is respectively reduced to 5g / m 2 / d and 132g / m 2 / d.

[0034] Table 2 Composite gel (10:1:1) coated paper water vapor transmission rate (WVTR, g / m 2 / d)

[0035]

[0036] By adjusting the volume ratio of each component of the composite gel, the water vapor transmission rate of the paper can be effectively improved. When the volume ratio of polyvinyl alcohol, nanoclay and alkali lignin in the composite gel ...

Embodiment 3

[0037] Example 3: Coating of physically cross-linked polyvinyl alcohol / nanoclay / alkali lignin composite gel (5:1:1) reduces the water vapor transmission rate of paper.

[0038] method:

[0039] Same as Example 1, the difference is that polyvinyl alcohol, nanoclay and alkali lignin are mixed in a volume ratio of 5:1:1.

[0040] The experimental results are shown in Table 3:

[0041] When the PVA / NC / AL composite gel (5:1:1) is coated on the paper surface with an amount of 4g / m 2 , the water vapor transmission rate of coated paper at 23°C, 50%RH and 38°C, 90%RH is respectively reduced to 21g / m 2 / d and 218g / m 2 / d.

[0042] Table 3 Composite gel (5:1:1) coated paper water vapor transmission rate (WVTR, g / m 2 / d)

[0043]

[0044] Continue to increase the volume ratio of nanoclay and alkali lignin in the composite gel, that is, the volume ratio of polyvinyl alcohol, nanoclay and alkali lignin is adjusted to 5:1:1, and the coating amount is 4g / m 2 At 23°C, 50% RH and 38°C...

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Abstract

The invention belongs to the field of food packaging materials, and particularly discloses a method for improving the water vapor barrier property of food packaging paper under high temperature and high humidity, the surface of paper is uniformly coated with a physically crosslinked polyvinyl alcohol / nano clay / alkali lignin composite gel, and normal pressure drying is performed to obtain the food packaging paper. On the basis of good film-forming property of polyvinyl alcohol, the stability of the polyvinyl alcohol hydrogel under high temperature and high humidity is improved by utilizing nano clay and alkali lignin, a stable compact layer is formed on the surface of the paper, the method is simple, easy to operate, safe and environment-friendly, and the green and environment-friendly performance of the paper is effectively guaranteed; the surface of paper is coated with the physically crosslinked polyvinyl alcohol / nano clay / alkali lignin composite gel, when the coating weight is 4.0g / m<2>, the water vapor permeability of the paper can be reduced by 99% under 23DEG C and 50% relative humidity (RH), the water vapor permeability of the paper can be reduced by 93% under 38DEG C and 90% relative humidity (RH), and the water vapor barrier property of food packaging paper can be effectively improved.

Description

technical field [0001] The invention belongs to the field of food packaging materials, and in particular relates to a method for improving the water vapor barrier performance of food packaging paper under high temperature and high humidity. Background technique [0002] The production of food packaging materials from renewable resources is gaining more and more attention. Cellulose is the largest renewable resource on earth. As a green environmental protection material, cellulose paper is widely used in various fields, but its moisture-proof performance is low under high temperature and high humidity, which seriously affects the quality and shelf life of food. At present, paper-plastic or paper-metal composite materials are generally used for moisture-proof treatment of paper, which can effectively block water vapor, but it is difficult to guarantee the green performance of plastic / metal-paper. Contents of the invention [0003] In view of the deficiencies in the prior a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/10D21H19/20D21H19/34D21H19/14D21H21/16
CPCD21H27/10D21H19/20D21H19/34D21H19/14D21H21/16Y02W90/10
Inventor 王旺霞谷峰邓志飞康伟杰曹文杰宋夏夏朱杨
Owner YANCHENG INST OF TECH
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