Acrylate coating for improving oxygen barrier property of PET (Polyethylene Terephthalate) film

Abstract

The invention discloses an acrylate coating for improving oxygen barrier property of a PET (polyethylene terephthalate) film. The acrylate coating is prepared from the following components in percentage by weight: 25-60% of a hard monomer, 2.5-12.5% of a soft monomer, 1-20% of a functional monomer, 0.2-1% of an initiator and 30-70% of a solvent. The hard monomer provides rigidity for a coating chain segment, the soft monomer prevents the coating from cracking, the functional monomer is dicarboxylic acid, the carboxylic acid group is unstable at high temperature and can be dehydrated to form anhydride, and the inter-chain anhydride can enable a molecular chain to form a net-shaped cross-linked structure, so that on one hand, the movement of the molecular chain segment is greatly limited, and on the other hand, the molecular chain segment is prevented from cracking; on the other hand, the interaction force of molecular chain segments is increased, and gaps between the chain segments are reduced. Therefore, the thermal motion of the molecular chain segment of the coating polymer is limited, the free volume fraction is reduced, the permeation path of oxygen is reduced or blocked, and the permeability of oxygen is reduced. Therefore, a coating layer measured by the acrylate coating disclosed by the invention has a good barrier effect on oxygen.

Description

technical field [0001] The invention relates to the field of paint preparation, in particular to an acrylate paint for improving the oxygen barrier properties of PET films. Background technique [0002] Known for its excellent sealability, transparency, high temperature resistance and tensile strength, polyethylene terephthalate (PET) film can meet most packaging requirements. In recent years, PET film has become an important packaging material in the fields of food, medicine and cosmetics. Therefore, the demand for high performance and new functionalities of PET films is growing, especially oxygen barrier properties. [0003] Oxygen barrier property is the ability of a material to prevent oxygen penetration. The existing oxygen barrier coatings are mainly crystalline polymers. Although this type of oxygen barrier can provide better oxygen barrier performance, due to high crystallization, such coatings are common. Highly brittle and difficult to dissolve. When used as a p...

AI Technical Summary

Problems solved by technology

[0003] Oxygen barrier property is the ability of a material to prevent oxygen penetration. The existing oxygen barrier coatings are mainly crystalline polymers. Although this type of oxygen barrier can provide better oxygen barrier performance, due to high crystallization, such coatings are common. Brittle, insoluble specific

When used as a coating, there are disadvantages such as poor coating adaptability

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