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Casting polypropylene film for coating metal substrate and preparation method thereof

A technology for casting polypropylene and metal substrates, which is applied in the direction of metal layered products, chemical instruments and methods, coatings, etc., can solve the problems of low printing strength, surface film breakage, and high equipment requirements, and achieve a simple and scientific preparation method , small molecular orientation, high elongation at break

Active Publication Date: 2014-12-24
ORG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the metal can industry, the can body material is generally tin-plated steel sheet, chrome-plated steel sheet or chrome-plated aluminum sheet. In order to protect the metal from corrosion, a layer of paint is usually applied to the outer surface of the metal material for the can. However, the coating process There will be organic solvents that pollute the environment volatilize, and the coating and coating equipment are expensive, and the coating process is complicated
[0003] Later, it was found that the double-drawn polyester film can be pasted on the surface of the metal substrate, which solved the problem of environmental pollution by organic solvents, but there are also some defects, such as: the double-drawn polyester film has a high melting point, and when it is hot-sticked to the surface of the metal substrate It requires higher temperature (generally 240-280°C), consumes more energy, has high requirements for equipment, and the lamination process is complicated; in addition, biaxially oriented polyester film molecules are highly oriented, although it can be printed after corona, However, the adaptability to ink is poor, and the printing strength is generally not high; in addition, the elongation at break of double-stretched polyester film is low, usually about 120%~180%. The rate can reach more than 300%) During the stretching process, problems such as separation of the film from the metal substrate or fracture of the surface film will occur
[0004] Although the polyolefin film produced by the casting process has the advantages of low melting point and high elongation at break (generally up to 400%), its adhesion to the metal substrate cannot be achieved without the use of adhesives. Low, especially difficult to meet the high bonding force required by high-temperature cooking after metal deformation, currently mainly used for flexible packaging

Method used

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  • Casting polypropylene film for coating metal substrate and preparation method thereof
  • Casting polypropylene film for coating metal substrate and preparation method thereof
  • Casting polypropylene film for coating metal substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Raw material formula of cast polypropylene film:

[0029] Polypropylene modified resin: maleic anhydride modified polypropylene resin (the molar content of maleic anhydride in the modified polypropylene resin is 5%), intrinsic viscosity 0.7dL / g;

[0030] Polypropylene resin: polypropylene chips, intrinsic viscosity 0.7dL / g.

[0031] Process method:

[0032] (1) Put the above-mentioned polypropylene modified resin and polypropylene chips into different barrels, melt them through different screw extruders, and then pass through a multi-channel co-extrusion head (for example, a co-extrusion with three channels The melt of polypropylene modified resin and polypropylene resin is extruded from the die of the extruder head), the temperature of the screw extruder and the die is controlled between 190-230°C, and the temperature of the barrel can be gradually increased from 180°C Raise to 320°C;

[0033] (2) The melt is cast by casting rolls, and the cooled film primary produc...

Embodiment 2

[0044] Raw material formula of cast polypropylene film:

[0045] Polypropylene modified resin: maleic anhydride modified polypropylene resin (the molar content of maleic anhydride in the modified polypropylene resin is 12%), intrinsic viscosity 0.8dL / g;

[0046] Polypropylene resin: polypropylene chips, intrinsic viscosity 0.8dL / g.

[0047] Process method:

[0048] (1) Put the above-mentioned maleic anhydride-modified polypropylene resin and polypropylene chips into different barrels, melt them through different screw extruders, and then extrude polypropylene through the die of the multi-channel co-extrusion head The melt of modified resin and polypropylene resin, the temperature of the screw extruder and the die is controlled between 190-230°C, and the temperature of the barrel can be gradually increased from 180°C to 320°C;

[0049] (2) The melt is cast by casting rolls, and the cooled film primary product is obtained after the cooling rolls are cooled. The temperature of ...

Embodiment 3

[0054] Raw material formula of cast polypropylene film:

[0055] Polypropylene modified resin layer: maleic anhydride modified polypropylene resin (the molar content of maleic anhydride in the modified polypropylene resin is 20%), intrinsic viscosity 0.85dL / g;

[0056] Polypropylene resin: polypropylene chips, intrinsic viscosity 0.85dL / g

[0057] Process method: (1) Put the above-mentioned maleic anhydride modified polypropylene resin and polypropylene chips into different barrels, melt them through different screw extruders, and then extrude them through the die mouth of the multi-channel co-extrusion head The melt of polypropylene modified resin and polypropylene resin is produced, the temperature of the screw extruder and the die is controlled between 190-230°C, and the temperature of the barrel can be gradually increased from 180°C to 320°C;

[0058] (2) The melt is cast by casting rolls, and the cooled film primary product is obtained after the cooling rolls are cooled....

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Abstract

The invention provides a casting polypropylene film for coating metal substrate and a preparation method thereof. The polypropylene film comprises a layer A and a layer B; the layer A is a polypropylene modified resin layer, and the layer B is a polypropylene resin layer; and the thickness ratio of the layer A to the layer B is 20-40:60-80. The casting polypropylene film is prepared by a co-extruded cast process; the modified polypropylene resin and the polypropylene resin have viscosity no less than 0.7dL / g; and a modified monomer for the polypropylene modified resin is maleic anhydride. The invention also provides a preparation method of the casting polypropylene film. The technical scheme provides the casting polypropylene film with high elongation and capable of covering on the surface of the metal substrate under low temperature, and solves defects in the prior art, such as over-high temperature for coating a biaxially oriented polyester film on a metal substrate, large energy consumption, low break elongation, incapability of deep processing, and incapability to coating on the metal substrate of an existing cast polyolefin film.

Description

technical field [0001] The invention relates to a polypropylene film and a preparation method thereof, in particular to a casting polypropylene film for laminating a metal substrate and a preparation method thereof. Background technique [0002] In the metal can industry, the can body material is generally tin-plated steel sheet, chrome-plated steel sheet or chrome-plated aluminum sheet. In order to protect the metal from corrosion, a layer of paint is usually applied to the outer surface of the metal material for the can. However, the coating process There will be organic solvents that pollute the environment volatilize, and the paint and coating equipment are expensive, and the coating process is complicated. [0003] Later, it was found that the double-drawn polyester film can be pasted on the surface of the metal substrate, which solved the problem of environmental pollution by organic solvents, but there are also some defects, such as: the double-drawn polyester film ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B27/32B32B15/085C08L51/06B29C47/00B29C41/26
Inventor 赵宇晖曾科尹化洁
Owner ORG TECH CO LTD
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