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Linear easy-to-tear polyamide film and preparation method thereof

A polyamide film and polyamide technology, applied in flat products, other household utensils, applications, etc., can solve the problem of difficult straight-line tear opening of composite bags, and achieve good straight-line tearing performance and excellent straight-line tearing performance.

Active Publication Date: 2016-07-20
厦门长塑实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of linear easy-to-tear polyamide film and its preparation method, to solve the technical problem that the composite bag is difficult to tear open in a straight line in the products of the prior art

Method used

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  • Linear easy-to-tear polyamide film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] 39 mass parts of PA6 (relative viscosity 3.0), 30 mass parts of MXD6 (relative viscosity 2.85), 10 mass parts of polyamide-polyether copolymer, 20 mass parts of PA6 / MXD6 secondary material, 1 mass part of MXD6-g-MAH is mixed, where the PA6 / MXD6 secondary material is prepared by melt extrusion of 70 parts by mass of PA6 and 30 parts by mass of MXD6 after pelletizing, and the mixture is melted and extruded in a single screw extruder , The melt is cast from the T-die to a chill roll with a surface temperature of 20°C to quench the cast sheet; the cast sheet is sent to a warm water tank that has been adjusted to 60°C, and the humidity is adjusted for 1 min; Use an air knife to blow dry the residual moisture on the surface of the cast piece; send the blow-dried cast piece to a stretching furnace, and perform simultaneous biaxial stretching at 170°C, with a stretching ratio of 2.8 in both longitudinal and transverse directions; The horizontal relaxation ratio was set to 3%, an...

Embodiment 2

[0032] 81 parts by mass of PA6 (relative viscosity 3.0), 8 parts by mass of MXD6 (relative viscosity 2.85), 5 parts by mass of polyamide-polyether copolymer, 3 parts by mass of PA6 / MXD6 secondary material, 3 parts by mass MXD6-g-MAH is mixed, where the PA6 / MXD6 secondary material is prepared by melt extrusion of 70 parts by mass of PA6 and 30 parts by mass of MXD6 after pelletizing, and the mixture is melted and extruded in a single screw extruder , Melt extruded in a single screw extruder, the melt is cast from a T-die to a chill roll with a surface temperature of 20°C to quench the cast sheet; the cast sheet is sent to a warm water tank adjusted to 60°C In the process, the humidity treatment is carried out for 1 min; the surface of the cast sheet after the humidity control is blown dry with an air knife; the cast sheet with the surface blown dry is sent to the stretching furnace for simultaneous biaxial stretching at 170°C , The stretching magnification in the longitudinal an...

Embodiment 3

[0034] 60 parts by mass of PA6 (relative viscosity 3.0), 20 parts by mass of MXD6 (relative viscosity of 2.85), 8 parts by mass of polyamide-polyether copolymer, 10 parts by mass of PA6 / MXD6 secondary material, 2 parts by mass MXD6-g-MAH is mixed, where the PA6 / MXD6 secondary material is made of 70 parts by mass of PA6 and 30 parts by mass of MXD6 after melt extrusion and pelletization, and melt extruded in a single screw extruder. Cast from the T-die cast to a chill roll with a surface temperature of 20°C to quench the cast piece; send the cast piece to a warm water tank that has been adjusted to 60°C, and implement a humidity adjustment treatment for 1 min; The surface of the sheet is dried with an air knife; the cast sheet with the dry surface is sent to the stretching furnace, and the simultaneous biaxial stretching is carried out at 170°C. The stretching magnification in both vertical and horizontal directions is 2.8; The relaxation ratio is set to 3%, and the heat setting...

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Abstract

The invention discloses a linear easy-to-tear polyamide film which comprises the following components in parts by mass: 39-81 parts of PA6, 8-30 parts of MXD6, 5-10 parts of softening agent, 3-20 parts of PA6 / MXD6 regrind and 1-3 parts of MXD6-g-MAH. The invention also discloses a preparation method of the linear easy-to-tear polyamide film, and the preparation method comprises the following steps: (I) weighing the components of the mass parts and mixing uniformly, melting in an extruder, and casting the melt to a sharp cooling roll quench-cooling cast piece with surface temperature of 20-30 DEG C; (II) conveying the cast piece into a warm-water tank adjusted to 40-65 DEG C and performing humidity adjustment treatment for 1-2min; and blow-drying residual moisture on the surface of the humidity-adjusted cast piece by an air knife; (III) conveying the cast piece with a blow-dried surface into a stretching furnace, and performing synchronous biaxial stretching at a temperature of 170-195 DEG C; and (IV) performing heat setting treatment at a temperature of 200-215 DEG C to continuously prepare linear easy-to-tear polyamide films with thickness of 10-30mu m. The polyamide film prepared in the invention has an excellent linear tearing property.

Description

Technical field [0001] The present invention relates to the technical field of films, in particular to a linear easily tearable polyamide film and a preparation method thereof. Background technique [0002] As the heat-sealing layer material of the flexible packaging composite film, linear low-density polyethylene, homopolypropylene and other polymers are usually used. This type of material has the characteristics of excellent sealing strength, but greater tear resistance, resulting in composite The problem that the bag is difficult to cut and tear. Since straight cracks cannot be produced but curved and inclined cracks, the risk of accidental leakage of the contents of the bag is increased when the bag is torn, especially when the package contains liquid content, it is easy to cause liquid to leak. Therefore, there is a need to develop a film for bags that can be easily torn by hand in a straight line at the incision. [0003] Biaxially oriented polyamide film has excellent mech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/00C08L23/08C08K5/20B29D7/01
CPCB29D7/01C08J5/18C08J2377/02C08J2423/08C08J2477/00C08J2477/02C08K2201/014C08L77/02C08L2203/16C08L2205/025C08L2205/03C08L77/00C08K5/20C08L23/0815
Inventor 林凤龙
Owner 厦门长塑实业有限公司
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