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High-barrier nylon film and preparation method thereof

A technology of nylon film and high barrier, applied in the field of nylon film packaging

Inactive Publication Date: 2013-01-30
厦门长塑实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the processing characteristics of the two materials are quite different. Among them, the glass transition temperature of PA6 is 55°C, while that of MXD6 is 85°C. It is difficult to produce the two-way stretched nylon film (BOPA film) according to the usual production process. To achieve normal production, there are the following contradictions in the MD stretching (longitudinal stretching) stage: the stretching temperature is set above the TG temperature (glass transition temperature) of MXD6, which is far beyond the normal processing temperature of PA6. At this time, the film and stretching The sticking phenomenon of the rollers will cause damage to the surface of the film, seriously affecting the production process and film quality; if the temperature is too low, the film cannot be stretched due to the MXD6 content, so that the production cannot proceed normally

Method used

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  • High-barrier nylon film and preparation method thereof

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the scope of the described embodiments.

[0019] figure 1 It is a schematic diagram of the three-layer structure of the high barrier film of the present invention. Such as figure 1 As shown, the high barrier film of the present invention comprises a first surface layer 1, a core layer 2, and a second surface layer 3, that is, the melts of the first surface layer 1, the core layer 2, and the second surface layer 3 are flow-cast to the excitation layer through a co-extrusion die. The cast sheet is chilled and then stretched longitudinally and transversely. In the above three-layer structure, the core layer 2 is located between the first skin layer 1 and the second skin layer 3 . Wherein, in the above-mentioned first surface layer 1: MXD6 mass percentage (%wt) content is 10-30%, PA6 mass percentage c...

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Abstract

The invention discloses a high-barrier nylon film which comprises a first surface layer, a core layer and a second surface layer, and is characterized in that in the first surface layer, the mass percentage of MXD6 is 10-30%, the mass percentage of PA6 is 66-88% and the mass percentage of self-made masterbatch is 2-4%, and in the second surface layer, the mass percentage of MXD6 is 10-30%, the mass percentage of PA6 is 66-88% and the mass percentage of self-made masterbatch is 2-4%. The invention also provides a preparation method of the high-barrier nylon film.

Description

Technical field: [0001] The invention relates to the field of nylon film packaging, in particular to a biaxially stretched nylon film with oxygen barrier performance and a preparation method thereof. technical background: [0002] Compared with other barrier materials, MXD6 (a kind of nylon formed by polycondensation of m-xylylenediamine and adipic acid) has the characteristics of less decrease in gas barrier properties and faster recovery of gas barrier properties during boiling or distillation treatment . Utilizing this feature, it can be made into a film with high barrier properties. However, compared with PA6 (nylon 6) film, MXD6 has the characteristics of poor flexibility, and the film is more brittle if used alone. Combining the characteristics of the two materials, under the premise of not affecting the barrier performance, the two materials are melt blended, extruded into a cast sheet and then biaxially stretched to produce a high barrier film. However, the proc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/18B32B27/34B29C69/00B29C47/06B29C55/12
Inventor 林凤龙赵黎
Owner 厦门长塑实业有限公司