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Manufacture method for biaxially oriented PVDF thin film

A manufacturing method and biaxial stretching technology, applied in the field of plastic film manufacturing, can solve the problems of uneven film thickness, thin neck, general performance, etc., and achieve low crystallization rate and crystallinity, low investment, simple manufacturing process and equipment. Effect

Inactive Publication Date: 2012-09-19
CHENGDU WISEDONE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the single-bubble tube process is used to blow the film, the resulting film has a general performance due to insufficient orientation. However, when the double-bubble tube secondary blowing process is used to process PVDF, due to the fast crystallization rate and high crystallinity of the PVDF resin, the film will Thin neck phenomenon is easy to appear during the first blowing and stretching process, resulting in uneven film thickness, which will directly cause the bubble tube to be easily broken during the second blowing and stretching process, and cannot form a stable bubble tube

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] PVDF resin 8Kg, Solef 1009 from Solvay, the melt flow rate is 3.5g / 10min (ASTM D12382.16Kg / 230°C);

[0029] PMMA resin 2Kg, Korea LG IF830, melt flow rate is 2.3g / 10min (ASTMD12383.8Kg / 230℃);

[0030] antioxidant 245: 0.1Kg, UV absorber 234: 0.2Kg.

[0031] A twin-screw extruder is used to melt and blend the above materials. The screw diameter is 20mm, L / D=20, and the extrusion temperature is 160-180°C. After extrusion and granulation, the materials are dried at 80°C for 6 hours.

[0032] The dried blend particles are melted and plasticized through the extruder in the double-bubble tube secondary blown film unit, and the extrusion temperature is 160-170°C. Extruded through the ring die to form a cylindrical tube embryo, the diameter of the ring die is 40mm. The tube embryo is cooled by the cooling air ring, and the temperature of the cold air in the cooling air ring is 15°C. In the first inflation stretching process, the stretch ratio is 10 and the inflation rati...

example 2

[0034] PVDF resin 7Kg, Solef 1009 from Solvay, the melt flow rate is 3.5g / 10min (ASTM D12382.16Kg / 230°C);

[0035] PMMA resin 3Kg, Korea LG IF830, melt flow rate is 2.3g / 10min (ASTMD12383.8Kg / 230℃);

[0036] antioxidant 245: 0.1Kg, UV absorber 234: 0.2Kg.

[0037] A twin-screw extruder is used to melt and blend the above materials. The screw diameter is 20mm, L / D=20, and the extrusion temperature is 160-180°C. After extrusion and granulation, the materials are dried at 80°C for 6 hours.

[0038] The dried blend particles are melted and plasticized through the extruder in the double-bubble tube secondary blown film unit, and the extrusion temperature is 160-170°C. Extruded through the ring die to form a cylindrical tube embryo, the diameter of the ring die is 40mm. The tube embryo is cooled by the cooling air ring, and the temperature of the cold air in the cooling air ring is 15°C. In the first inflation stretching process, the stretch ratio is 15, and the inflation rat...

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Abstract

The invention discloses a manufacture method for a biaxially oriented PVDF thin film, and relates to the manufacture field of plastic film. The method comprises the steps of adding a proper amount of polymer which is compatible with PVDF, into a PVDF resin to form a blend; blowing and stretching the blend twice by a double-bubble tube twice blowing-stretching film manufacture process, to obtain the PDVF thin film having high orientation degrees in both horizontal direction and vertical direction. Compared with the method of the prior art, the method of the invention can manufacture the biaxially oriented PVDF thin film with better performance, is relatively simple in both manufacture process and equipment, and has low investment for production line.

Description

Technical field: [0001] The invention relates to a method for manufacturing biaxially stretched PVDF, which belongs to the field of plastic film manufacturing. Background technique [0002] Polyvinylidene fluoride (PVDF) is a high-crystallinity, fluorine-containing thermoplastic engineering plastic. In addition to special properties such as piezoelectricity, dielectricity, and pyroelectricity, it also has good chemical corrosion resistance and high temperature resistance. Durability, oxidation resistance, super weather resistance, radiation resistance, can be used outdoors for a long time without maintenance. Therefore, it is widely used as an outdoor protective film for electronic and electrical components and related facilities. [0003] At present, the manufacturing method of PVDF generally adopts cast film method and bubble tube blown film method. The casting film method requires extremely high technological conditions, complex equipment composition, and huge investmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08L33/12C08L33/08C08L33/10C08L31/04B29C55/14
Inventor 黄莲华
Owner CHENGDU WISEDONE TECH
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