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Preparation method of three-layer co-extruded polyvinyl fluoride film

A polyvinyl fluoride, three-layer co-extrusion technology, used in chemical instruments and methods, layered products, flat products, etc., can solve problems such as poor, uneven film surface color and low compatibility, etc.

Active Publication Date: 2016-07-20
中化蓝天氟材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The special structure of polyvinyl fluoride results in little difference between its melting temperature and decomposition temperature, so it is not suitable to adopt the traditional processing method of direct melt extrusion of thermoplastic resin
In the production, the method of adding latent solvent to reduce the melting temperature of the resin to prepare the film, coupled with this special processing method, coupled with the low surface energy of the polyvinyl fluoride resin and the poor compatibility of the filler additive with the resin, etc., may easily lead to Fillers or additives migrate to the surface of the film, causing problems such as die deposits, uneven color of the film surface, and insufficient smoothness of the film surface, reducing product quality

Method used

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  • Preparation method of three-layer co-extruded polyvinyl fluoride film
  • Preparation method of three-layer co-extruded polyvinyl fluoride film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 20kg gamma-butyrolactone in the high-speed disperser, after temperature rises to 80 ℃, with 10kg polyvinyl fluoride resin, 30gUV-326 (Ciba company sales A kind of hydroxyphenyl benzotriazole ultraviolet absorber), 20g light stabilizer 770 (Ciba company sales A hindered amine light stabilizer) was respectively added to high-speed stirring γ-butyrolactone to disperse into uniform slurry A. Add 20kg of γ-butyrolactone into the high-speed disperser, and after the temperature rises to 80°C, add 20kg of polyvinyl fluoride resin into the high-speed stirring γ-butyrolactone to disperse into uniform slurry B.

[0021] The slurry is transported to the hopper of the twin-screw extruder through a metering pump, and passed through a co-extrusion die equipped with a melt distributor, and cast on a cold hub at 50°C to obtain a thick sheet. The thick sheet is first stretched longitudinally in a stretching roller at 80°C with a draw ratio of 3 times, then stretched transversely a...

Embodiment 2

[0023] Add 15kg of γ-butyrolactone into the high-speed disperser, and after the temperature rises to 80°C, add 10kg of polyvinyl fluoride resin, 1.5kg of titanium dioxide, and 0.3kg of heat stabilizer (epoxidized soybean oil) into the high-speed stirring γ-butyrolactone respectively. Butyrolactone was dispersed into uniform white slurry A. Add 20kg of γ-butyrolactone into the high-speed disperser, and after the temperature rises to 80°C, add 15kg of polyvinyl fluoride resin and 1.5kg of titanium dioxide into the high-speed stirring γ-butyrolactone to disperse into uniform white slurry B.

[0024] The slurry is transported to the hopper of the twin-screw extruder through a metering pump, passes through a co-extrusion die equipped with a melt distributor, and is cast on a cold hub at 50°C to obtain a thick sheet. The thick sheet is first stretched longitudinally in a stretching roller at 80°C with a draw ratio of 3 times, then stretched transversely at 120°C with a draw ratio of...

Embodiment 3

[0026] Add 15kg N,N-dimethylacetamide to the high-speed disperser, and after the temperature rises to 75°C, mix 10kg polyvinyl fluoride resin, 2kg titanium dioxide, 5g carbon black, 0.5kg matting powder, 0.05kgUV-360 Ciba sales A kind of hydroxyphenylbenzotriazole ultraviolet absorber , 0.35kg of heat stabilizer (barium stearate) were added to high-speed stirring N,N-dimethylacetamide and dispersed into a uniform white slurry A. Add 20kg of N,N-dimethylacetamide to the high-speed disperser, and after the temperature rises to 75°C, add 20kg of polyvinyl fluoride resin and 1.5kg of titanium dioxide to the high-speed stirring N,N-dimethylacetamide respectively Disperse into a uniform white slurry B.

[0027] The slurry is transported to the hopper of the twin-screw extruder through a metering pump, passes through a co-extrusion die equipped with a melt distributor, and is cast on a cold hub at 50°C to obtain a thick sheet. The thick sheet is stretched longitudinally in a st...

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Abstract

The invention provides a preparation method of a three-layer co-extruded polyvinyl fluoride film. The BA-type three-layer co-extruded polyvinyl fluoride film is obtained in a two-way stretching mode by preparing two types of slurry and forming tape casting through a three-layer co-extrusion die head. The prepared film has excellent ageing resistance.

Description

technical field [0001] The invention belongs to the field of polymer material processing, and in particular relates to a preparation method of a three-layer co-extruded polyvinyl fluoride film. Background technique [0002] Polyvinyl fluoride is -CH 2 -CHF- is a chain crystalline polymer with a structural unit, which has similar excellent properties to other fluorine-containing polymers. As a film and coating, it has been widely used in construction, decoration, electronic circuits, photovoltaic industries and other fields. [0003] Due to the special structure of polyvinyl fluoride, the difference between its melting temperature and decomposition temperature is not large, so it is not suitable to adopt the traditional processing method of direct melt extrusion of thermoplastic resin. In the production, the method of adding latent solvent to reduce the melting temperature of the resin to prepare the film, coupled with this special processing method, coupled with the low sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/20B32B27/30C08L27/14B29C47/06B29C55/14B29L7/00B29L9/00
Inventor 张艳中张昱喆刘伟常怀云马培良
Owner 中化蓝天氟材料有限公司