Macromolecular alloy packaging material

A polymer alloy and packaging material technology, applied in the field of polymer alloy packaging materials, can solve problems such as single polymer

Active Publication Date: 2012-10-24
KUSN ZHANGPU COLOR PRINTING FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In summary, since the orientation processes of amorphous polymers and crystalline polymers are completely different, the existing technology only solves the orientation of a single polymer, such as: commercially available OPA, OPP, OPET, etc.
With the development of science and technology, the application of homogeneous materials has been limited. Multi-layer composite and coating methods can endow packaging materials with multiple functions and obtain different functions through the combination of structures according to requirements. It is more effective for reducing material costs. Improving the barrier property is also subject to great limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: The structural expression is: C-Y-A

[0040] In the formula: C is specifically PP; Y specifically represents a blend structure of two materials in one layer: MLDPE blended with VLDPE; A is VLDPE.

[0041] Its specific structure has 3 layers:

[0042] PP / MLDPE blended VLDPE / VLDPE;

[0043] Among them, the melting temperature of PP (C) is about 250°C, and the melting temperature of VLDPE (A) is about 160°C. Therefore, the melting temperature difference between C and A is 90°C; therefore, between C and A The internal stress gradient distribution bridge Y is set, and the viscosity of the interlayer melt and the uniformity of the forming cooling shrinkage are assisted by blending, and the polymer alloy material with a moderate thermal stress gradient is obtained by 10 times stretching.

Embodiment 2

[0044] Embodiment two: the structural expression is: A1-Y 1 -C-Y 2 -A2

[0045] In the formula, A1 is specifically PP; Y 1 Specifically represents a single-layer structure: EVA; C specifically PVDC; Y 2 It specifically represents a two-layer structure: EVA / MLDPE; A2 is specifically an ionic resin.

[0046] Its specific structure has 6 layers:

[0047] PP / EVA / PVDC / EVA / MLDPE / ion resin

[0048] Among them, the melting temperature of PP (A1) is about 260°C, the melting temperature of PVDC (C) is about 140°C, and the melting temperature of ionic resin (A2) is about 190°C. Therefore, the melting temperature between A1 and C The temperature difference of melt processing and forming is 120°C, and the temperature difference of melt processing and forming between C and A2 is 50°C; therefore, an internal stress gradient distribution bridge Y is set between A1 and C 1 , set the internal stress gradient distribution bridge Y between C and A2 2 . The polymer alloy packaging material...

Embodiment 3

[0049] Embodiment three: the structural expression is: A1-Y 1 -C-Y 2 -A2

[0050] In the formula, A1 is specifically PA; Y 1 It specifically represents a three-layer structure: anhydride-modified polypropylene polymer / PP / EVA; C is specifically PVDC; Y 2 It specifically represents a two-layer structure: EVA / MPE; A2 is specifically LLDPE or LLDPE blended with LDPE.

[0051] Its specific structure has a total of 8 layers:

[0052] PA / anhydride modified polypropylene polymer / PP / EVA / PVDC / EVA / MPE / LLDPE or LLDPE blended with LDPE

[0053] Among them, the melting temperature of PA (A1) is about 270°C, the melting temperature of PVDC (C) is about 145°C, and the melting temperature of LLDPE (A2) is about 210°C. Therefore, the melting process between A1 and C The temperature difference is 125°C, and the melting temperature difference between A2 and C is 65°C; therefore, an internal stress gradient distribution bridge Y is set between A1 and C 1 , set the internal stress gradient di...

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PUM

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Abstract

The invention relates to a macromolecular alloy packaging material with the thickness ranging from 0.015 to 0.300mm, in particular to a high-performance multiplayer coextruded stretch compound packaging material that is compounded by 3 layers or more of resins by a coextrusion blowing or coextrusion stretch method and by changing orientation in a range of 30 to 1000 percent to change the molecular structure of polymer so as to control the permeability of gas and vapor, and physical and mechanical properties of materials. The vapor barrier is required to be controllable in a range of 0.05g / m2.24h.atm to 30g / m2.24h.atm; and the gas barrier is required to be controllable in a range of 0.05ml / m2.24h.atm to 2500ml / m2.24h.atm. The invention has more functions through secondary processing, such as printing, compounding, coating, thermal molding and sacking, and is suitable for the barrier applications, such as high humidity barrier, oxygen barrier, oil barrier and aroma conservation in various environments.

Description

technical field [0001] The invention relates to a polymer alloy packaging material with a thickness in the range of ≥0.015 and ≤0.300 millimeters, in particular to a composite of three or more resin layers by co-extrusion blow molding or co-extrusion casting method, High-performance multi-layer co-extruded stretch composite packaging material that changes the molecular structure of the polymer to control the gas and water vapor permeability of the material and other physical and mechanical properties of the material by changing the degree of orientation within the range of 30% to 1000%. . Its water vapor barrier requirement is ≥0.05g / m 2 ·24h·atm and ≤30g / m 2 ·Controllable within 24h·atm range; gas barrier requirement is ≥0.05ml / m 2 ·24h·atm and ≤2500ml / m 2 ·24h·atm range controllable. This kind of packaging material can be widely used in food, processed meat products, daily necessities, cosmetics, chemical products, pesticides, military products, sealed flexible packagin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/00B65D65/40B65D30/02
Inventor 夏嘉良高学文
Owner KUSN ZHANGPU COLOR PRINTING FACTORY
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