Release film for leather and preparation method thereof

Abstract

The invention discloses a preparation method of a release film for leather. The preparation method comprises the following steps: preparing a pre-coating coating; preparing a release layer coating; preparing a base material through corona treatment; coating the base material with a pre-coating layer paint, and curing to form a pre-coating layer to obtain a pre-coated base material; and embossing and curing the release layer coating on the pre-coated base material by adopting a slit coating mode assisted by electron beams to form a release layer, and obtaining the release film for leather. The invention further discloses the release film for leather. The release film for the leather comprises a three-layer structure, namely the release layer synthesized by aliphatic polyurethane propionic acid resin, the pre-coating layer of water-based acrylic emulsion and the base material subjected to corona treatment; embossing and curing are cured by adopting an electron beam assisted direct rolling mode, so that embossing and curing are carried out at the same time, and the problem that a traditional release film is poor in flatness and texture fidelity due to limitation of the physical strength of a base material is solved; and the obtained product has the advantages of being vivid in texture, high in repeated utilization rate and good in solvent resistance, surface scratch resistance and flatness.

Description

technical field [0001] The invention relates to the field of release film production, in particular to a release film for leather and a preparation method thereof. Background technique [0002] Due to the limitation of the physical strength of the base paper, the traditional release paper for artificial leather is prone to tearing due to the decrease in strength after repeated use, and the base paper will shrink during the high temperature process and is prone to curling problems. After repeated use, it may The flatness of the texture is affected by the deformation of the base paper. [0003] At present, most release papers have complex hierarchical structures and their preparation methods are cumbersome. For example, Chinese patent CN107722323A proposes a release film for the production of synthetic leather cured by UV, which utilizes UV resin, leveling agent and photosensitizer The mixed embossed layer paint is coated on a 100-200 μm PET film, and the embossed layer paint...

AI Technical Summary

Problems solved by technology

[0002] Due to the limitation of the physical strength of the base paper, the traditional release paper for artificial leather is prone to tearing due to the decrease in strength after repeated use, and the base paper will shrink during the high temperature process and is prone to curling problems. After repeated use, it may The flatness of the texture is affected by the deformation of the base paper

[0003] At present, most release papers have complex hierarchical structures and their preparation methods are cumbersome. For example, Chinese patent CN107722323A proposes a release film for the production of synthetic leather cured by UV, which utilizes UV resin, leveling agent and photosensitizer The mixed embossed layer paint is coated on a 100-200 μm PET film, and the embossed layer paint is embossed and UV-irradiated in a semi-cured state at 85-95°C to obtain a patterned release film , but this technology is limited by the limited energy density and irradiation of ultraviolet rays, which limits the thickness of the UV-cured coating, so the release film cured by ultraviolet rays is only suitable for flat or polar lines, and an embossed layer is required in the production process The coating is in a semi-cured state, and the production process is complicated

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