Surface protection sheet

A protective sheet and vinyl technology, applied to film/sheet-shaped adhesives, adhesive types, safety equipment, etc., can solve problems such as surface protection sheet breakage, reduced operability, and surface protection sheet floating, and achieve Good workability, prevention of breakage, and outstanding effect of preventing floating

Inactive Publication Date: 2013-08-21
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] It has been found that the surface protection sheet breaks and handleability during metal bending. Although the handleability is good when the base material is made of low-density polyethylene, the surface protection sheet breaks. On the contrary, when the base material is made of ethylene-α - In the case of an olefin copolymer composition, the surface protection sheet does not break, but the handleability is significantly reduced
In addition, it has also been found that in the case of using a hydrogenated product of a random copolymer composed of styrene and a diene or an olefin-based copolymer as an adhesive in order to improve anchoring properties, if it is placed on a polypropylene substrate, There will be a problem of floating of the surface protection sheet due to the influence of the hardness of the base material
On the other hand, it has been found that if it is installed on a soft polypropylene base material with good flexibility, although the problem of floating of the surface protection sheet can be improved, there is a problem of lowering the handleability.

Method used

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  • Surface protection sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Relative to the density of 0.919g / cm 3 Low-density polyethylene (Sumitomo Mitsui Polyolefin Co., Ltd., Sumikasen F-218) 80% by weight, and a density of 0.882g / cm 3 A resin mixture consisting of 20% by weight of ethylene-octene copolymer (Exxon Mobil, EXACT8201), mixed with 3.8% by weight of carbon black (manufactured by Mitsubishi Chemical, carbon black "#45"), natural silica (average particle diameter 5.0 μm) 0.2% by weight, a film was formed at a die temperature of 170° C. using a blow molding machine to produce a support base material with a thickness of 100 μm. A styrene-ethylene-butylene-styrene polymer (manufactured by Asahi Kasei Co., Ltd., Tuftec H1221) was applied to the obtained supporting substrate so that the thickness after drying was 15 μm, and dried to prepare a surface protection sheet.

Embodiment 2

[0068] Relative to the density of 0.918g / cm 3 70% by weight of low-density polyethylene (manufactured by Japan Polychem Corporation, Nobatec LD LC-500), and a density of 0.902g / cm 3 A resin mixture composed of 30% by weight of an ethylene-octene copolymer (Exxon Mobil, EXACT0201), mixed with 3.8% by weight of carbon black (manufactured by Mitsubishi Chemical, carbon black "#45"), and a weather-resistant stabilizer (Ciba Specialty Chemicals Chimassorb 944 (manufactured by the company) 0.1% by weight was formed into a film at a die temperature of 200° C. using a blow molding machine to produce a supporting base material having a thickness of 80 μm. A solution obtained by dissolving a propylene-based copolymer (manufactured by Sumitomo Chemical Co., Ltd., Tafthren X2135) in a toluene solution and filtering it was applied to the obtained support substrate so that the thickness after drying was 5 μm, and dried to prepare a surface Protective sheet.

Embodiment 3

[0070] Relative to the density of 0.919g / cm 3 Low-density polyethylene (Sumitomo Mitsui Polyolefin Co., Ltd., Sumikasen F-218) 75% by weight, and a density of 0.882g / cm 3 A resin mixture composed of 25% by weight of ethylene-octene copolymer (manufactured by Exxon Mobil, EXACT8201), mixed with 3.8% by weight of carbon black (manufactured by Mitsubishi Chemical, carbon black "#45"), lubricant (manufactured by NOF Corporation, Alflow H50S) 0.6% by weight, the obtained substrate layer component and the adhesive layer component composed of styrene-ethylene-butylene-random polymer (manufactured by JSR Corporation, Dynaron 2324P) were heated at 200° C. The die head temperature was formed into a film by co-extrusion, and a surface protection sheet composed of a base material layer of 110 μm and an adhesive layer of 8 μm was produced.

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Abstract

The invention provides a surface protection sheet. The surface protection sheet has the advantages of no fracture or floatation during metal bending processing, good operationality and excellent anchoring effect. The invention also provides a bending processing method of a metal plate using the surface protection sheet. The surface protection sheet is obtained through forming an adhesive layer on one surface of a substrate layer of a resin mixture formed by low-density polyethylene and an ethylene-alpha-olefin copolymer, the theoretic substrate density obtained through calculating according to the respective densities of low-density polyethylene and the ethylene-alpha-olefin copolymer and a mixing ratio is 0.905-0.915g / cm<3>, and the machine-direction (MD) and transverse-direction (TD) Elmendorf tear strength, the MD / TD tear strength ratio and the largest MD and TD stress of the surface protection sheet are 0.1-0.9N, 0.2-2.0 and 20-30MPa respectively.

Description

technical field [0001] The present invention relates to a surface protection sheet. Specifically, the present invention relates to a surface protection sheet that can be used for, for example, a metal plate, a painted metal plate, an aluminum alloy frame, a resin plate, a decorative steel plate, a vinyl chloride-laminated steel plate, When members such as glass plates are transported, processed, or maintained, they are attached to the surface of these members to protect them. Background technique [0002] A surface protection sheet having excellent metal bending workability comprising an ethylene-α-olefin copolymer in a support base material has been proposed (for example, refer to Patent Document 1). Since the surface protection sheet contains 50% by weight or more of ethylene-α-olefin resin, the surface protection sheet does not break during bending. However, there is a problem in operability. Specifically, after affixing a surface protection sheet to a metal plate, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J125/04C09J123/14B21D55/00B21D5/00
Inventor 武田公平生岛伸祐山户二郎
Owner NITTO DENKO CORP
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