A kind of linear easy-tear polyamide film and preparation method thereof

A polyamide film and polyamide technology, which is applied in flat products, other household appliances, applications, etc., can solve the problems of difficult linear tear opening of composite bags, and achieve the effect of good linear tear performance and excellent linear tear performance.

Active Publication Date: 2018-02-09
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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  • A kind of linear easy-tear polyamide film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] With 39 parts by mass of PA6 (relative viscosity 3.0), 30 parts by mass of MXD6 (relative viscosity 2.85), 10 parts by mass of polyamide-polyether copolymer, 20 parts by mass of PA6 / MXD6 secondary material, 1 part by mass of MXD6-g-MAH is mixed, wherein PA6 / MXD6 secondary material is obtained by melt extrusion of 70 parts by mass of PA6 and 30 parts by mass of MXD6 after pelletization, and the mixture is melted and extruded in a single-screw extruder , the melt is cast from a T-shaped die to a chilled roller with a surface temperature of 20°C for quenching casting; the cast sheet is sent to a warm water tank whose temperature has been adjusted to 60°C, and the humidity is adjusted for 1 minute; the humidity is adjusted The surface of the final cast sheet is blown dry with an air knife to dry the residual moisture on the surface; the dry cast sheet is sent to a stretching furnace for synchronous biaxial stretching at 170°C, and the stretching ratios of both vertical and h...

Embodiment 2

[0032] With 81 mass parts of PA6 (relative viscosity 3.0), 8 mass parts of MXD6 (relative viscosity 2.85), 5 mass parts of polyamide-polyether copolymer, 3 mass parts of PA6 / MXD6 secondary material, 3 mass parts of MXD6-g-MAH is mixed, wherein PA6 / MXD6 secondary material is obtained by melt extrusion of 70 parts by mass of PA6 and 30 parts by mass of MXD6 after pelletization, and the mixture is melted and extruded in a single-screw extruder , melted and extruded in a single-screw extruder, the melt is cast from a T-shaped die to a chilled roll with a surface temperature of 20°C for quenching casting; the cast sheet is sent to a warm water bath that has been adjusted to 60°C During the process, 1min of humidity control treatment is carried out; the surface of the cast sheet after humidity adjustment is blown dry with an air knife; the dry cast sheet is sent to a stretching furnace for synchronous biaxial stretching at 170°C , the longitudinal and transverse stretch ratios are b...

Embodiment 3

[0034] With 60 mass parts of PA6 (relative viscosity 3.0), 20 mass parts of MXD6 (relative viscosity 2.85), 8 mass parts of polyamide-polyether copolymer, 10 mass parts of PA6 / MXD6 secondary material, 2 mass parts of MXD6-g-MAH is mixed, wherein the PA6 / MXD6 secondary material is obtained by melt extrusion of 70 mass parts of PA6 and 30 mass parts of MXD6 after pelletization, melt extrusion in a single-screw extruder, melt Cast from a T-shaped die to a chilled roller with a surface temperature of 20°C for quenching casting; send the cast sheet to a warm water tank whose temperature has been adjusted to 60°C, and perform a humidity-conditioning treatment for 1 min; Dry the residual moisture on the surface of the sheet with an air knife; send the dried sheet to a stretching furnace for synchronous biaxial stretching at 170°C, and the stretching ratios in the vertical and horizontal directions are both 2.8; The relaxation ratio is set to 3%, and heat setting treatment is carried ...

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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 invention relates to the technical field of films, in particular to a linear easy-to-tear polyamide film and a preparation method thereof. Background technique [0002] As the heat-sealing layer material of flexible packaging composite film, polymers such as linear low-density polyethylene and homopolypropylene are usually used. The bag is difficult to cut and difficult to tear. Since straight slits cannot be produced but curved and inclined slits, the risk of accidental leakage of the contents of the bag increases when the bag is torn open, especially when the package contains liquid contents, which can easily cause liquid leakage. 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 is widely used in food packaging and daily necessities packaging due to its excellent mechanical properties, barrier properties, and strong puncture resis...

Claims

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Application Information

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Patent Type & Authority Patents(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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