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CN-122013603-A - Fluorine-free waterproof and oil-proof barrier material, fluorine-free waterproof and oil-proof paper and preparation method thereof

CN122013603ACN 122013603 ACN122013603 ACN 122013603ACN-122013603-A

Abstract

The invention provides a fluorine-free waterproof and oil-proof blocking material, fluorine-free waterproof and oil-proof paper and a preparation method thereof, and relates to the technical field of waterproof and oil-proof packaging paper. The fluorine-free waterproof and oil-proof barrier material comprises a component A and a liquid B in a mass ratio of (5-8) (2-5), wherein the liquid B is a chitosan solution with a mass fraction of 1-3wt%, and the component A is as follows. The fluorine-free waterproof and oil-proof barrier material is obtained by compounding epoxy silicone oil modified by two silane coupling agents and a chitosan solution, the reaction activity and the functional adjustability of an organosilicon polymer are greatly enhanced by introducing amino groups in the component A, and the grafted 3-methacryloxypropyl trimethoxysilane can form a crosslinked network, so that the cohesive strength and the interface binding force are obviously enhanced, and the fluorine-free waterproof and oil-proof barrier material has excellent waterproof and oil-proof performances. The chitosan is added to improve the film forming property, so that a film with low surface energy is obtained on the surface of the paper, and the film has excellent waterproof and oil-proof green environment-friendly barrier properties. The structural formula of the component A is as follows.

Inventors

  • WANG YANHUA
  • WANG SONGLIN
  • XU JUN
  • LI XUAN
  • WU JIAHUI

Assignees

  • 青岛科技大学

Dates

Publication Date
20260512
Application Date
20260415

Claims (10)

  1. 1. A fluorine-free waterproof and oil-proof barrier material is characterized by comprising a component A and a liquid B in a mass ratio of (5-8) (2-5), wherein the liquid B is a chitosan solution with a mass fraction of 1-3 wt%, and the component A is ,1≤m≤15,5≤n≤100。
  2. 2. A method for preparing the fluorine-free water-proof and oil-proof barrier material according to claim 1, comprising the steps of: Adding a silane coupling agent KH-550 with the mass ratio of (10-25) to 20 and epoxy silicone oil into a solvent, performing an epoxy ring-opening reaction at 30-40 ℃, then adding a silane coupling agent KH-570 with the mass ratio of (5-7) to 20 and the epoxy silicone oil, adding water and a catalyst, and performing a hydrolytic condensation reaction at 35-60 ℃ to obtain a component A; Preparing a chitosan solution with the mass fraction of 1-3wt% into a solution B; And mechanically mixing the component A and the liquid B according to a set proportion to obtain the fluorine-free waterproof and oil-proof barrier material.
  3. 3. The method for preparing the fluorine-free waterproof and oil-proof barrier material according to claim 2, wherein the molecular structure of the epoxy silicone oil is: ,1≤m≤15,5≤n≤100。
  4. 4. The preparation method of the fluorine-free waterproof and oil-proof barrier material is characterized in that the solvent is absolute ethyl alcohol or isopropanol, and the mass volume ratio of the epoxy silicone oil to the solvent is 0.25-0.5 g/mL.
  5. 5. The method for preparing the fluorine-free waterproof and oil-proof barrier material according to claim 2, wherein water is added in the hydrolysis condensation reaction, and the addition amount of the water is 5-6wt% of the epoxy silicone oil.
  6. 6. The preparation method of the fluorine-free waterproof and oil-proof barrier material according to claim 2, wherein the catalyst for the hydrolytic condensation reaction is dibutyl tin dilaurate, and the ratio of the volume of the catalyst to the mass of the epoxy silicone oil is (15-20) mu L and 20g.
  7. 7. The method for preparing the fluorine-free waterproof and oil-proof barrier material according to claim 2, wherein in the method for preparing the liquid B, the solvent is an aqueous solution of acetic acid with a mass fraction of 0.5-1.5wt%.
  8. 8. The preparation method of the fluorine-free waterproof and oilproof paper is characterized by comprising the following steps of: The fluorine-free waterproof and oil-proof barrier material of claim 1 is coated on the surface of a paper base material, and is heated and cured at 50-70 ℃ to 0.5 h. The component A and the liquid B synergistically enhance the barrier property of the paper, and a protective layer with good film forming property can be formed on the surface of the paper when the paper is coated with the paper, so that the paper can resist the penetration of moisture and grease.
  9. 9. The method for producing fluorine-free water-and oil-repellent paper according to claim 8, wherein the fluorine-free water-and oil-repellent barrier material has a coating amount of 9 on the surface of the paper-based material 10g/m 2 。
  10. 10. A fluorine-free water-and oil-repellent paper prepared by the method for preparing a fluorine-free water-and oil-repellent paper according to any one of claims 8 to 9.

Description

Fluorine-free waterproof and oil-proof barrier material, fluorine-free waterproof and oil-proof paper and preparation method thereof Technical Field The invention relates to the technical field of waterproof and oilproof packaging paper, in particular to a fluorine-free waterproof and oilproof blocking material, fluorine-free waterproof and oilproof paper and a preparation method thereof. Background The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art. Paper is a bio-based, recyclable and biodegradable cellulosic material that can be a substitute for disposable plastic packaging. However, the hydroxyl groups in the fiber structure and the porosity of the fibers make the paper hydrophilic, and the paper has poor barrier properties to water and oil media, so that the application of the paper is limited, and the improvement of the barrier properties of the paper-based material becomes the key of the application in the field of paper-based packaging materials. Fluorine-containing compounds, petroleum-based polymers and the like can provide paper with excellent water and oil repellency, but are limited in use due to the risk of nuisance which can cause harm to human health and ecosystems. Conventional polysiloxanes (e.g., polydimethylsiloxane) have some hydrophobicity but are not effective in blocking low surface tension oils. In the existing fluorine-free waterproof agent, the organic silicon is generally only endowed with waterproof effect, oil-proof performance is difficult to realize at the same time, so that the application of the fluorine-free waterproof agent in the fields of food packaging, oil-proof paper and the like is limited, most of polysiloxanes are of an inactive or monofunctional structure, and active groups capable of chemically bonding with hydroxyl groups on the surface of paper fibers are lacking. The coating mainly depends on physical adsorption or weak hydrogen bonding, and has poor interfacial bonding force, so that the barrier property is rapidly reduced. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a fluorine-free waterproof and oil-proof blocking material, fluorine-free waterproof and oil-proof paper and a preparation method thereof. In order to achieve the above object, the present invention is realized by the following technical scheme: The fluorine-free waterproof and oil-proof blocking material comprises a component A and a liquid B in a mass ratio of (5-8) (2-5), wherein the liquid B is a chitosan solution with a mass fraction of 1-3 wt%, and the component A is ,1≤m≤15,5≤n≤100。 In a second aspect, the preparation method of the fluorine-free waterproof and oil-proof blocking material comprises the following steps: Adding a silane coupling agent KH-550 with the mass ratio of (10-25) to 20 and epoxy silicone oil into a solvent, performing an epoxy ring-opening reaction at 30-40 ℃, then adding a silane coupling agent KH-570 with the mass ratio of (5-7) to 20 and the epoxy silicone oil, adding water and a catalyst, and performing a hydrolytic condensation reaction at 35-60 ℃ to obtain a component A; Preparing a chitosan solution with the mass fraction of 1-3wt% into a solution B; And mechanically mixing the component A and the liquid B according to a set proportion to obtain the fluorine-free waterproof and oil-proof barrier material. In a third aspect, a method for preparing fluorine-free waterproof and oilproof paper includes the following steps: and coating the fluorine-free waterproof and oil-proof barrier material on the surface of a paper base material, and heating and curing at 50-70 ℃ for 0.3-0.7 h. In a fourth aspect, the fluorine-free waterproof and oilproof paper is prepared by the preparation method of the fluorine-free waterproof and oilproof paper. The beneficial effects of the invention are as follows: According to the invention, two silane coupling agent modified epoxy silicone oils are compounded with chitosan solution to obtain the fluorine-free waterproof and oil-proof blocking material, the reaction activity and the functional adjustability of an organosilicon polymer are greatly enhanced by introducing amino groups in the component A, and the grafted 3-methacryloxypropyl trimethoxy silane can form a crosslinked network with the silicone oil, so that the cohesive strength and the interface binding force are obviously enhanced, and the fluorine-free waterproof and oil-proof blocking material has excellent waterproof and oil-proof performances. The chitosan is added to improve the film forming property, so that a film with low surface energy is obtained on the surface of the paper, and the film has excellent waterproof and oil-proof green environment-friendly ba