Three-layer composite release film for 3D printing process and preparation method of three-layer composite release film

Abstract

The invention discloses a three-layer composite release film for a 3D printing process and a preparation method of the three-layer composite release film. The three-layer composite release film comprises a layer B and layers A arranged on the two sides of the layer B, the component of the layer A is poly (4-methyl-1-pentene); the component of the layer B is long-chain branch modified poly (4-methyl-1-pentene); the ratio of the total mass of the layer A to the mass of the layer B is 10: (1-5); the preparation method of the long-chain branch modified poly (4-methyl-1-pentene) comprises the following steps: mixing poly (4-methyl-1-pentene), a grafting monomer and an initiator, and carrying out melt extrusion to obtain the long-chain branch modified poly (4-methyl-1-pentene), and the grafting monomer comprises 1, 4-butanediol diacrylate and maleic anhydride. According to the invention, the poly (4-methyl-1-pentene) and the long-chain-chain modified poly (4-methyl-1-pentene) are respectively used as the surface layer and the middle layer, so that the prepared release film has excellent release property under the condition that a release agent is not added, and the film is high in light transmittance and good in mechanical property and can meet the use requirements in the 3D printing process.

Description

technical field [0001] The invention relates to the technical field of release films, in particular to a three-layer composite release film for 3D printing process and a preparation method thereof. Background technique [0002] Stereolithography (SLA) is a relatively mature 3D printing technology. The photocuring system uses photosensitive resin as raw material, irradiates with low-power ultraviolet light, and shapes the photosensitive resin in a fixed temperature and humidity environment (normal temperature 18-28°C, humidity ≤ 60%-70%). Compared with selected laser sintering (SLS) or selected laser melting (SLM), the light curing system has a simple structure and low cost, and can realize the rapid generation of high-precision complex models. This characteristic determines that the light curing 3D printing technology has more For a wide range of product applications and development prospects. [0003] The release film used in 3D printing SLA is a film material that is fix...

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Problems solved by technology

[0005] The present invention aims to overcome the problems that the release film in the prior art has the defects of release agent migration, low light transmittance, or easy cracking along the MD direction of tape casting, and is not suitable for 3D printing process, and provides a 3D printing process Using a three-layer composite release film and a preparation method thereof, respectively adopting poly-4-methyl-1-pentene and long-chain branched modified poly-4-methyl-1-pentene as the surface layer and the middle layer, the prepared The release film has excellent release properties without adding a release agent, and the film has high light transmittance and good mechanical properties, which can meet the requirements for use in the 3D printing process

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