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Polyvinylidene fluoride composite membrane prepared through multilayer coextrusion tape casting method

A polyvinylidene fluoride, multi-layer co-extrusion technology, applied in the direction of flat products, household appliances, other household appliances, etc., can solve the problems of unfavorable industrial production, reduce the good quality of PVDF film, complicated operation process, etc., and achieve anti-ultraviolet performance. Excellent, large-scale continuous production, and high process controllability

Inactive Publication Date: 2012-08-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned various modification methods have their own advantages and limitations, but in general, these two methods will introduce other substances or groups into the PVDF membrane, which will reduce the excellent quality of the PVDF membrane, and its operating process Complicated, not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 1% silane coupling agent KH-550 into TiO2, and mix it with a high-speed mixer for 20 minutes at 80°C. Add 100g of treated TiO2 to 1000g of PVDF, mix evenly, extrude and granulate, and use it as material A. Add 20g of treated TiO2 and 400g of PMMA to 1000g of PVDF, mix evenly, extrude and granulate, and use as B material. Add material A and material B above to machine A and machine B of the three-layer co-extrusion equipment respectively; at the same time, add EVA resin to machine C of the three-layer co-extrusion equipment, and extrude and cast it into a film. The film thickness was 25 μm, and the film width was 1000 mm. . The film is A / B / C three-layer composite, and the thickness ratio of the three layers A:B:C is 1:1:1. The outer layer of the film is a PVDF protective layer, the middle is a modified layer, and the inner layer is an EVA adhesive layer. After testing, the tensile strength of the film is 40.2 MPa (ASTM D882-80, A method 22° C.), and the peel stre...

Embodiment 2

[0022] Add 1.2% silane coupling agent KH-550 to TiO2, and mix it with a high-speed mixer for 20 minutes at 80°C. Add 70g of treated TiO2 to 1000g of PVDF, mix evenly, extrude and granulate, and use it as material A. Add 15g of treated TiO2 and 430g of PMMA to 1000g of PVDF, mix evenly, extrude and granulate, and use as B material. Add material A and material B above to machine A and machine B of the three-layer co-extrusion equipment respectively; at the same time, add EVA resin to machine C of the three-layer co-extrusion equipment, and extrude and cast it into a film. The film thickness was 38 μm, and the film width was 800 mm. The film is A / B / C three-layer composite, and the thickness ratio of the three layers A:B:C is 1.5:2:1. The outer layer of the film is a PVDF protective layer, the middle is a modified layer, and the inner layer is an EVA adhesive layer, which has good adhesive performance. After testing, the tensile strength of the film is 44 MPa (ASTM D882-80, A m...

Embodiment 3

[0024] Add 1.5% silane coupling agent KH-550 to TiO2, and mix it with a high-speed mixer for 20 minutes at 80°C. Add 50g of treated TiO2 to 1000g of PVDF, mix evenly, extrude and granulate, and use it as material A. Add 20g of treated TiO2 and 450g of PMMA to 1000g of PVDF, mix evenly, extrude and granulate, and use as B material. The above-mentioned material A and material B are respectively added to machine A and machine B of the double-layer co-extrusion equipment, and the double-layer co-extrusion is cast into a film. The film thickness was 30 μm, and the film width was 500 mm. The film is an A / B double-layer composite, and the thickness ratio of the two layers A:B is 1:1.5. The outer layer of the film is a PVDF protective layer, and the inner layer is a PVDF modified layer, which has good adhesive properties. After testing, its tensile strength is 42.4MPa (ASTM D882-80, A method 22 ℃), and the surface tension of the inner layer is 38 dyne.

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Abstract

The invention relates to a process for preparing a polyvinylidene fluoride composite membrane through a multilayer coextrusion tape casting method. The method comprises the following steps: resin modification is performed on PVDF (Polyvinylidene Fluoride) resin by using TiO2 and PMMA, and then different modified resins are respectively added into a corresponding machine of multilayer coextrusion equipment, and finally, the composite membrane is formed through extrusion tape casting of the multilayer coextrusion equipment. The polyvinylidene fluoride composite membrane prepared through the multilayer coextrusion tape casting method is characterized is that the polyvinylidene fluoride composite membrane prepared through the multilayer coextrusion tape casting method adopts a multilayered structure, the outer layer of the multilayered structure is a PVDF protecting layer, the middle layer is a modified layer, and the inner layer is an EVA glue layer. The composite membrane not only has the excellent weather resisting property, the uvioresistant property and the excellent mechanical property of the PVDF, meanwhile has an excellent adhesive property, and can be well bonded together with a solar energy rear panel base material. In addition, the product cost performance is high, the degree of automation of the production technology is high, and the polyvinylidene fluoride composite membrane is suitable for industrial production.

Description

1. Technical field [0001] The invention relates to a method for preparing a polyvinylidene fluoride composite film by adopting a multilayer co-extrusion casting method, and belongs to the field of polymer material processing. 2. Background technology [0002] Polyvinylidene fluoride resin (PVDF) is a fluorine-containing material with excellent comprehensive properties developed in the 1970s, which belongs to fluorocarbon thermoplastic resin. Due to the large electronegativity of fluorine element, the small van der Waals radius, the carbon-fluorine bond energy is extremely strong (up to 485KJ / mol), and the helical rod-shaped molecules in its unique fluorinated chain overall structure are compact, rigid, and smooth on the surface, making Fluoroplastics are excellent in weather resistance, heat resistance, high and low temperature resistance, and chemical resistance. The excellent characteristics of fluororesin make fluorine-containing materials (fluorine film or fluorocarbon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/06B29L7/00B29K27/12
Inventor 苑会林刘小建冯刚李鑫
Owner BEIJING UNIV OF CHEM TECH
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