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A kind of biaxially stretched polypropylene film with high heat-sealing strength and its manufacturing method

A technology of biaxial stretching and polypropylene film, which is applied in the polymer field, can solve problems such as unfavorable packaging, reduced film stiffness, and reduced film rigidity, and achieve good physical and mechanical properties, excellent film stiffness, and low cost.

Active Publication Date: 2017-03-01
HAINAN SHINER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Heat-sealing biaxially oriented polypropylene film is used in hundreds of thousands of tons every year in the country. It is widely used in cigarette packaging, pharmaceutical packaging, tea packaging, cosmetic packaging and other daily necessities packaging, but it is rarely used directly in food packaging. One of the main reasons is that the heat-sealing strength of heat-sealing biaxially oriented polypropylene is relatively small, generally less than 4N / 15mm. If it is to be used in food packaging, it must be combined with PE or CPP film, which will increase production costs and cause a series of environmental problems
The patent application of CN200810177464 discloses a heat-sealable biaxially oriented polypropylene film, which improves the heat-sealing strength of the film by adding a propylene-butene copolymer to the heat-sealing layer and the core layer, but the propylene-butene copolymer It is a very "soft" polymer, and its price is high. Its addition will significantly reduce the rigidity of the film. Although the heat sealing performance has been improved, the stiffness of the film has been reduced, which is not conducive to packaging, and will also increase cost

Method used

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  • A kind of biaxially stretched polypropylene film with high heat-sealing strength and its manufacturing method
  • A kind of biaxially stretched polypropylene film with high heat-sealing strength and its manufacturing method
  • A kind of biaxially stretched polypropylene film with high heat-sealing strength and its manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Films with a thickness of 18 μm were produced.

[0030] Ingredients: The thickness of the upper layer is 2 μm, including 96% of copolymerized polypropylene, 3% of low stereoregular polyolefin and 1% of synthetic silica; the thickness of the middle layer is 14 μm, of which 96% of homopolypropylene, 3% of low stereoregularity polyolefin, Mixed antistatic agent 1%, mixed antistatic agent includes 50% ethoxylated amine and 50% glycerol monostearate; the thickness of the lower layer is 2 μm, of which copolymerized polypropylene is 86%, low stereoregularity polyolefin 12% and 2 % synthetic silica.

[0031] Film making: The biaxially oriented polypropylene film of the present invention is produced by a biaxially oriented co-extrusion process, wherein the extruder temperature: 243°C; the casting machine temperature: 18°C; the longitudinal stretch ratio: 530%, the longitudinal stretching pre Heating temperature: 100°C, longitudinal stretching temperature: 84°C; transverse stret...

Embodiment 2

[0034] Films with a thickness of 30 μm were produced.

[0035] Ingredients: The thickness of the upper layer is 3 μm, including 91% of copolymerized polypropylene, 7.5% of low stereoregularity polyolefin and 1.5% of synthetic silica; the thickness of the middle layer is 24 μm, of which 92% of homopolypropylene, 6% of low stereoregularity polyolefin, mixed Antistatic agent 2%, mixed antistatic agent including 40% ethoxylated amine and 60% glycerol monostearate; lower layer thickness 3μm, of which copolymerized polypropylene 90%, low stereoregularity polyolefin 8% and synthetic silica 2%.

[0036] Film production: The biaxially oriented polypropylene film of the present invention is produced by a biaxially oriented co-extrusion process, wherein the extruder temperature: 200°C; the caster temperature: 35°C; the longitudinal stretch ratio: 480%, and the longitudinal stretch Heating temperature: 105°C, longitudinal stretching temperature: 100°C; transverse stretching ratio: 800%, ...

Embodiment 3

[0039] Films with a thickness of 40 μm were produced.

[0040] Ingredients: the upper layer is 5 μm thick, including 86% polypropylene copolymer, 12% low stereoregularity polyolefin and 2% synthetic silica; the middle layer is 30 μm thick, including 87% homopolypropylene, 10% low stereoregularity polyolefin, mixed Antistatic agent 3%, mixed antistatic agent including 60% ethoxylated amine and 40% glycerol monostearate; lower layer thickness 5μm, of which copolymerized polypropylene 96%, low stereoregularity polyolefin 3% and synthetic silica 1%.

[0041] Film production: The biaxially oriented polypropylene film of the present invention is produced by a biaxially oriented co-extrusion process, wherein the extruder temperature: 260°C; the casting machine temperature: 23°C; the longitudinal stretch ratio: 510%. Heating temperature: 110°C, longitudinal stretching temperature: 70°C; transverse stretching ratio: 1000%, transverse stretching preheating temperature: 190°C, transvers...

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Abstract

The invention relates to a high-heat seal strength biaxial oriented polypropylene film and a manufacturing method thereof. The film comprises an upper layer, a middle layer and a lower layer, and is of a three-layered structure, wherein the total thickness is 18-40 microns. The upper layer is prepared from the following raw materials in percentage by weight: 86%-96% of co-polypropylene, 3%-12% of low-stereoregularity polyolefin and 1%-2% of synthesized silica; the middle layer is prepared from the following raw materials in percentage by weight: 87%-96% of homo-polypropylene, 3%-10% of low-stereoregularity polyolefin and 1%-3% of a mixed antistatic agent; and the lower layer is prepared from the following raw materials in percentage by weight: 86%-96% of co-polypropylene, 3%-12% of low-stereoregularity polyolefin and 1%-2% of synthesized silica. The mixed antistatic agent is prepared from the following raw materials in percentage by weight: 40%-60% of ethoxylated amine and 40%-60% of glycerin monostearate. The film has high heat seal strength; and compared with an existing heat seal film, the stiffness of the film is improved.

Description

technical field [0001] The invention relates to a biaxially stretched polypropylene film with high heat-sealing strength and a manufacturing method thereof, belonging to the technical field of macromolecules. Background technique [0002] Heat-sealing biaxially oriented polypropylene film is used in hundreds of thousands of tons every year in the country. It is widely used in cigarette packaging, pharmaceutical packaging, tea packaging, cosmetic packaging and other daily necessities packaging, but it is rarely used directly in food packaging. One of the main reasons is that the heat-sealing strength of heat-sealing biaxially oriented polypropylene is relatively small, generally less than 4N / 15mm. If it is to be used in food packaging, it must be combined with PE or CPP film, which will increase production costs and cause a series of environmental problems. The patent application of CN200810177464 discloses a heat-sealable biaxially oriented polypropylene film, which improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B27/18B29C69/02B29C55/14B29C47/92B29C48/92
CPCB29C48/92B29C55/14B29C69/02B32B27/06B32B27/18B32B27/32B32B33/00B32B2307/31
Inventor 黎坛王俊峰
Owner HAINAN SHINER IND