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A kind of preparation method of biaxially stretched polyvinyl fluoride film

A technology of polyvinyl fluoride and biaxial stretching, which is applied in the field of biaxially stretched polyvinyl fluoride film preparation, can solve the problems of low latent solvent content, excessive latent solvent volatilization, and inability to ensure continuous transverse stretching, etc., to achieve uniformity Good, overcoming operational complexity, and expanding the application field of thin films

Active Publication Date: 2011-12-14
SINOCHEM LANTIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in actual production, the temperature of the above-mentioned preheating roller is 140°C-145°C and the temperature of the longitudinal stretching roller is 130°C-135°C, which will cause the latent solvent to volatilize too quickly during the stretching process, and the latent solvent content after the longitudinal stretching is too low, which cannot be guaranteed Subsequent transverse stretching is carried out continuously

Method used

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  • A kind of preparation method of biaxially stretched polyvinyl fluoride film

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Effect test

Embodiment 1

[0034] Add polyvinyl fluoride resin (molecular weight 1,000,000) 100kg, γ-butyrolactone 180kg, plasticizer dioctyl phthalate (DOP) 5kg, titanium dioxide 20kg, pigment carbon black (C) 0.2kg in the mixing mixer, Stir for about 20 minutes to obtain a slurry with a viscosity of 1.0 cpa.

[0035] The slurry is extruded into cast sheets through a twin-screw extruder and a die, and the cast sheets are cooled and shaped at 40°C by a cooling hub.

[0036] Then carry out longitudinal stretching on stretching rollers, longitudinal stretching is 4 times, stretching temperature is 100°C, and transverse stretching is carried out on a horizontal stretching machine, said transverse stretching is 4 times, stretching temperature is 130°C.

[0037] 170°C negative pressure suction and then connected to a condenser tube to collect, remove the residual latent solvent on the film, collect volatile components (mainly latent solvent), control the temperature range of 190°C for shaping to obtain a ...

Embodiment 2

[0040] Add polyvinyl fluoride resin (molecular weight 1500000) 100kg, γ-butyrolactone 200kg, plasticizer dioctyl phthalate (DOP) 5kg, titanium dioxide 20kg, pigment carbon black (C) 0.2kg in the mixing mixer, Stir for about 20 minutes to obtain a slurry with a viscosity of 1.1 cpa. The slurry is extruded into cast sheets through a twin-screw extruder and a die, and the cast sheets are cooled and shaped by a cooling hub at 40°C.

[0041] After longitudinal stretching for 5 times, the stretching temperature is 110°C, and transverse stretching is carried out on a horizontal stretching machine, and the transverse stretching is 3 times, and the stretching temperature is 135°C.

[0042] Pumping and devolatilization at 170°C, collecting volatile components (latent solvent), and setting at 190°C to obtain a biaxially oriented polyvinyl fluoride film. The shaped film is corona treated (380 volts, 20kHz), and the surface energy of the film is 50 dynes.

[0043]

Embodiment 3

[0045] Add 100kg of polyvinyl fluoride resin (molecular weight: 2,000,000), 150kg of N,N-dimethylformamide (DMF), 5kg of plasticizer dioctyl phthalate (DOP), 20kg of titanium dioxide, and pigment carbon into the mixer Black (C) 0.2kg, stirred for about 20 minutes to obtain a slurry with a viscosity of 1.2cpa. The slurry is extruded into cast sheets through a twin-screw extruder and a die head, and the cast sheets are cooled and shaped by a cold hub at 30°C, and then stretched longitudinally by 2 times at a stretching temperature of 90°C and transversely stretched by 7 times at a stretching temperature of 140°C °C, devolatilization at 150 °C, and setting at 170 °C to obtain a biaxially oriented polyvinyl fluoride film. The qualitative film was corona treated (380 volts, 20kHz), and the surface energy of the film was 52 dynes.

[0046]

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Abstract

A preparation method of a biaxially stretched polyvinyl fluoride film belongs to the technical field of polymer processing, and the preparation method comprises the following steps: well mixing polyvinyl fluoride resin powder, a solvent, a plasticizer and fillers to obtain a mixed material with viscosity of 1.0 cpa-1.2 cpa, quantitatively delivering the mixed material to a hopper of a twin screw extruder by a slurry pump, performing strip casting by the twin screw extruder and a mould head, cooling and setting the casting strip by a cold hub, performing longitudinal stretching, transverse stretching, devolatilization, setting, surface treatment, trimming to obtain the biaxially stretched polyvinyl fluoride film. The preparation method of the invention reduces the processing temperature, and increases the film uniformity; by selective addition of fillers or pigment, the color of the film can be changed, which extends the application field of the film; the biaxial stretching process step improves the mechanical properties of the film, and increases the barrier property of the film; and a film product with good uniformity and excellent surface properties is obtained.

Description

technical field [0001] The invention belongs to the technical field of polymer processing, and in particular relates to a preparation method of a biaxially stretched polyvinyl fluoride film. Background technique [0002] Polyvinyl fluoride (polyvinyl fluoride) is the simplest representative of fluoropolymer homologues, and its composition contains the least number of fluorine atoms, so it has the lowest density and production cost compared with other fluoropolymers. But like other fluoropolymers, polyvinyl fluoride resins have exceptional chemical resistance, hydrophobicity and abrasion resistance. In particular, it has excellent aging resistance and non-stick properties. As a film and coating, polyvinyl fluoride is widely used in construction, decoration, electronic circuits, solar energy and other fields. [0003] Polyvinyl fluoride is based on -CH 2 CHF—chain crystalline polymer as a structural unit. Since there is a fluorine atom with a high electronegativity in the ...

Claims

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Application Information

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IPC IPC(8): C08L27/14C08K3/22C08K3/26C08K3/36C08K3/04C08K5/12B29C55/14B29C71/04B29C48/92
CPCB29C48/40Y02P70/10
Inventor 张艳中张昱喆陈伟马培良
Owner SINOCHEM LANTIAN
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