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Method for controlling synchronous degradation of each layer of co-extrusion composite film by utilizing same biological base

A technology of co-extrusion compounding and thin film, applied in the direction of chemical instruments and methods, synthetic resin layered products, layered products, etc.

Active Publication Date: 2014-09-03
圣厦药品食品包装新材料(昆山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a method for controlling the synchronous degradation of each layer in a co-extruded composite film, aiming to use the existing bioactive additive "EcoPure" which has the characteristics of biodegradability to most common commercial plastics containing carbon chains, to solve many problems. The degradation rate of each layer of materials in the multi-layer co-extruded composite film tends to be consistent during the biodegradation process, so as to achieve the purpose of developing a biodegradable co-extruded composite film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] Embodiment 1: A kind of three-layer co-extruded composite film

[0112] The structural expression is: B-C-A

[0113] In the formula:

[0114] B represents the first layer, and the material is nylon 6 (PA6), accounting for 21.2% by weight of the total weight of the co-extruded composite film;

[0115] C represents the second layer, the material is a linear low-density polyethylene-based polymer (TIE) modified by maleic anhydride grafting, and the weight percentage accounting for the total weight of the co-extruded composite film is 10%;

[0116] A represents the third layer, the material is low-density polyethylene (LDPE), accounting for 68.8% by weight of the total weight of the co-extruded composite film.

[0117] The co-extruded composite film of this embodiment is an asymmetric three-layer structure: PA6 / TIE / LDPE, wherein:

[0118] The molecular formula of PA6 is: -[NH-(CH 2 )5-CO]n-

[0119] After calculation, the molecular weight of PA6 is 113.1586, and the at...

Embodiment 2

[0130] Embodiment 2: A kind of five-layer co-extruded composite film

[0131] The structural expression is: A i -C a -B h -C b -A j

[0132] In the formula:

[0133] A i and A j Indicates the first layer and the fifth layer respectively, the materials of the first layer and the fifth layer are low-density polyethylene (LDPE), and the weight percentage of the first layer and the fifth layer to the total weight of the co-extruded composite film is 38.25% %;

[0134] C a and C b Indicates the second layer and the fourth layer respectively, and the materials of the second layer and the fourth layer are linear low-density polyethylene-based polymers (TIE) grafted with maleic anhydride, and the materials of the second layer and the fourth layer account for The percentage by weight of the total weight of the co-extruded composite film is 8%;

[0135] B h Indicates the third layer, the material is ethylene-vinyl alcohol copolymer (EVOH) (32%PE+68%PVA), accounting for 7.5...

Embodiment 3

[0149] Embodiment 3: A kind of five-layer co-extruded composite film

[0150] The structural expression is: A k -C a -B h -C b -A l

[0151] In the formula:

[0152] A k Indicates the first layer, the material is nylon 6 (PA6), accounting for 20% by weight of the total weight of the co-extruded composite film;

[0153] C a and C b Indicates the second layer and the fourth layer respectively, and the materials of the second layer and the fourth layer are linear low-density polyethylene-based polymers (TIE) grafted with maleic anhydride, and the materials of the second layer and the fourth layer account for The percentage by weight of the total weight of the co-extruded composite film is 10%;

[0154] B h Indicates the third layer, the material is ethylene-vinyl alcohol copolymer (EVOH) (32%PE+68%PVA), accounting for 10% by weight of the total weight of the co-extruded composite film;

[0155] A l Indicates the fifth layer, which is made of low-density polyethylene ...

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Abstract

The invention discloses a method for controlling the synchronous degradation of each layer of a co-extrusion composite film by utilizing the same biological base. Aiming at the co-extrusion composite film which is in three layers or more than three layers, a biological active additive 'EcoPure' is used as the biological base. The method is characterized by comprising the following steps of: calculating a weight proportion relationship between carbon contents of each layer of the co-extrusion composite film first, then determining the addition concentration of the biological base of each layer according to the weight proportion relationship between the carbon contents of each layer in extruded polymer of each layer before the preparation, and making the degradation rate of each layer of the co-extrusion composite film be accordant. The method disclosed by the invention has the contribution of having a predictable control ability for the biological degradation process and the degradation rate of multi-layer co-extrusion composite film which is composed of different polymers; and by balancing the concentration of the biological base, the biological degradation rate which is suitable for the final processing environment is provided, and the appearance, the function and the physical and mechanism performance of a product before being discarded are ensured to be unchanged.

Description

technical field [0001] The invention relates to the technical field of a biodegradable multi-layer co-extruded composite film, in particular to a method for controlling the synchronous degradation of each layer in the composite film by using the same biological base. Background technique [0002] Multi-layer co-extruded composite film refers to a film composed of three or more layers of different polymers, which is compounded by co-extrusion blow molding method, co-extrusion casting method or co-extrusion stretching method. As a plastic packaging material, this film is widely used in food, processed meat products, daily necessities, cosmetics, chemical products, pesticides, military products, etc. wrapper function. It has various barrier properties such as high moisture resistance, oxygen resistance, oil resistance, and fragrance retention in various environments. In addition, this film can also be used as a printing substrate to print various patterns and characters by gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/18
Inventor 夏嘉良高学文夏瑜唐敏艳
Owner 圣厦药品食品包装新材料(昆山)有限公司
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