A kind of biaxially stretched polyamide film and preparation method thereof

A polyamide film, biaxial stretching technology, applied in chemical instruments and methods, flat products, other household appliances, etc., can solve the problems of reducing the puncture resistance and flexibility of the film, low yield of nylon film, and high rigidity, etc. To achieve the effect of excellent straight-line easy tearing effect and good straight-line tearing performance

Active Publication Date: 2021-11-23
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

However, in actual production, it is found that the special nylon MXD6 added to the nylon film material has straight-line tearability, but MXD6 has high rigidity and is easy to break the film, which reduces the puncture resistance and flexibility of the film, and subsequent processing is prone to pinholes, etc. problems, and the bow effect is obvious, resulting in a relatively low yield of linear easy-to-tear nylon film

Method used

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  • A kind of biaxially stretched polyamide film and preparation method thereof
  • A kind of biaxially stretched polyamide film and preparation method thereof

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preparation example Construction

[0029] The preparation method of the biaxially stretched polyamide film of the embodiment of the present invention comprises:

[0030] Step 1. Mix the components in layers A, B, and C in proportion, and disperse them evenly with a high-speed mixer;

[0031] Step 2. Melt and co-extrude the homogeneously mixed raw materials in Step 1 through three extruders, and cast the melt through a T-shaped die to a quenched cast sheet with a chilled roller with a surface temperature of 15-35°C;

[0032] Step 3. The cast sheet in step 2 is subjected to a humidity-conditioning treatment for 1-2 minutes in a water tank at 40-75°C. After the humidity-conditioning, the surface of the cast sheet is dried with an air knife to dry the residual moisture on the surface, and simultaneous or distributed pulling is carried out. Stretching, the stretching temperature is 130-205°C, and the stretching ratio is 2.5×2.5-3.5×3.5;

[0033] Step 4. The film obtained in step 3 is subjected to heat setting treat...

Embodiment 1

[0035] Such as figure 1 As shown, a biaxially oriented polyamide film with a thickness of 15 μm and layers A and C with a thickness of 2 μm.

[0036] In terms of mass percentage, layer A and layer C are both composed of 69.5% nylon 6, 30% special nylon composition and 0.5% anti-stick nylon masterbatch; layer B is composed of 85% nylon 6 and 15% special nylon composition;

[0037] The special nylon composition is composed of MXD6-PA66 copolymer, PA512, PA66 / PA6 copolymer and MXD6-g-MAH, and the content ratio is 6:4:3:1.

Embodiment 2

[0039] Such as figure 1 As shown, a biaxially oriented polyamide film with a thickness of 15 μm and layers A and C with a thickness of 3 μm.

[0040] In terms of mass percentage, layer A and layer C are composed of 79% nylon 6, 20% special nylon composition and 1% anti-stick nylon masterbatch; layer B is composed of 65% nylon 6 and 35% special nylon composition;

[0041] The special nylon composition is composed of MXD6-PA66 copolymer, PA612, MXD6 / PA6 copolymer and MXD6-g-MAH, and the content ratio is 7:3:3:1.

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Abstract

The invention provides a biaxially oriented polyamide film and a preparation method thereof, wherein the biaxially oriented polyamide film comprises three layers of co-extruded biaxially oriented nylon film, which are layers A, B, and C from top to bottom; A Layer and C layer are composed of 67% ~ 79.5% nylon 6, 20% ~ 30% special nylon composition and 0.5% ~ 3% anti-stick nylon masterbatch; B layer is composed of 65% ~ 85% nylon 6 and 15% ~ Composition of 35% special nylon composition; special nylon composition contains MXD6-PA66 copolymer, long carbon chain nylon, nylon copolymer and compatibilizer. The film has the effect of straight-line tearing, and even the bags compounded with PP, PE and other films also have straight-line tearing performance.

Description

technical field [0001] The invention relates to the technical field of film materials, in particular to a biaxially stretched polyamide film and a preparation method thereof. Background technique [0002] With the development of social economy, people are increasingly pursuing the convenience of life, especially in the field of packaging. Existing products used for food, medicine and other packaging usually use PE, PP and other materials as the heat-sealing layer, and the outer layer is made of PA, PET and other materials. The bag with this structure has the characteristics of high sealing strength and excellent barrier properties. But there is also the problem that the tearing resistance is large, and it cannot be torn straight along the scratches during use, which causes certain troubles in people's lives. Especially for the elderly and children, due to physical strength factors, it is more desirable that the product is easy to tear. Therefore, the demand for films with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/34B32B27/18B32B27/06B32B33/00B29D7/01C08L77/02C08L77/06C08L51/08C08J5/18
CPCB29D7/01B32B27/08B32B27/18B32B27/34B32B33/00B32B2307/582C08J5/18C08J2377/02C08J2451/08C08J2477/06
Inventor 林新土陈曦郑伟贾露刘运锦李智尧廖贵何
Owner 厦门长塑实业有限公司
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