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Coated high-barrier biaxially stretched polylactic acid film and preparation method thereof

A biaxially stretched, high-barrier technology, applied in chemical instruments and methods, coatings, flat products, etc., can solve the problems of pinhole defects on the film surface, decrease in film softness, and affect film barrier properties, etc., and achieve simple process , Water resistance improvement, the effect of improving water resistance

Active Publication Date: 2020-02-11
中仑新材料股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The softness of the BOPLA film using inorganic nanomaterials as the barrier layer will decrease
In addition, for the BOPLA film using inorganic nanomaterials as the barrier layer, due to the agglomeration of inorganic particles in the coating dispersion, the gap between the particles may cause pinhole defects on the surface of the film, which affects the barrier properties of the film.

Method used

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  • Coated high-barrier biaxially stretched polylactic acid film and preparation method thereof
  • Coated high-barrier biaxially stretched polylactic acid film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A coating-type high-barrier biaxially oriented polylactic acid film preparation method, the total film thickness is 19 μm; the film thickness of the high-barrier coating is 2 μm, the film thickness of the primer layer is 2 μm, the film thickness of A layer is 3 μm, the film thickness of B layer is 9 μm, and the film thickness of C layer The film thickness is 3 μm.

[0049] Its preparation steps are as follows:

[0050] Step a, preparing the substrate layer:

[0051] Step a1, blending PLA, toughening agent, compatibilizer, chain extender, antioxidant, antistatic agent, antiblocking agent, smooth agent in proportion, melt blending, extruding through twin-screw extruder, Granulating, drying the masterbatch obtained, for subsequent use;

[0052] Step a2, blending PLA, toughening resin, compatibilizer, and chain extender in proportion, melt blending, extruding, and granulating through a twin-screw extruder, and drying the obtained masterbatch for subsequent use;

[0053] St...

Embodiment 2

[0066] A coating-type high-barrier biaxially oriented polylactic acid film preparation method, with a total film thickness of 18 μm; a high-barrier coating film thickness of 1.5 μm, an undercoat film thickness of 1.5 μm, a layer A film thickness of 3 μm, and a B layer film thickness of 9 μm. The film thickness of layer C is 3 μm.

[0067] Its preparation steps are identical with embodiment 1.

[0068] In step a1, the material ratio is: 85 parts of PLA, 10 parts of toughening agent, 2 parts of compatibilizer, 1 part of chain extender, 0.5 part of antioxidant, 0.5 part of antistatic agent, 0.5 part of anti-blocking agent, 0.5 part of cooling agent lubricant;

[0069] In step a2, the material ratio is: 87 parts of PLA, 10 parts of toughening resin, 2 parts of compatibilizer, and 1 part of chain extender;

[0070] In step b, the mass ratio of PVA: acrylic emulsion: polyurethane emulsion is 5:4:1; the content of layered silicate is 0.1%-1%; the neutralization degree of NaOH is 10...

Embodiment 3

[0073] A coating-type high-barrier biaxially stretched polylactic acid film preparation method, with a total film thickness of 17 μm; a high-barrier coating film thickness of 1 μm, an undercoat film thickness of 1 μm, a layer A film thickness of 3 μm, a B layer film thickness of 9 μm, and a C layer The film thickness is 3 μm.

[0074] Its preparation steps are identical with embodiment 1.

[0075] In step a1, the material ratio is: 74 parts of PLA, 20 parts of toughening agent, 3 parts of compatibilizer, 1 part of chain extender, 0.5 part of antioxidant, 0.5 part of antistatic agent, 0.5 part of anti-blocking agent, 0.5 part of cooling agent lubricant;

[0076] In step a2, the material ratio is: 76 parts of PLA, 20 parts of toughening resin, 3 parts of compatibilizer, and 1 part of chain extender;

[0077] In step b, the mass ratio of PVA: acrylic emulsion: polyurethane emulsion is 5:4:1; the content of layered silicate is 0.1%-1%; the neutralization degree of NaOH is 10mol%...

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Abstract

The invention relates to a coated high-barrier biaxially stretched polylactic acid film and a preparation method thereof. The coated high-barrier biaxial tensile polylactic acid film structurally comprises a high-barrier coating, a bottom coating and a substrate layer from inside to outside in sequence, wherein the substrate layer is composed of three layers of a co-extruded biaxially stretched PLA (polylactic acid) film, namely a layer A, a layer B and a layer C; the layer A and the layer C comprise the following components in parts by mass: 68-93.2 parts of PLA, 5-20 parts of a toughening agent, 1-3 parts of a compatibilizer, 0.2-1 part of a chain extender, 0.2-1 part of an antioxidant, 0.5-3 parts of an antistatic agent, 0-1 part of an open agent and 0-1 part of a smoothening agent; thelayer B comprises the following components in parts by mass: 76-93.8 parts of PLA, 5-20 parts of a toughened resin, 1-3 parts of a compatibilizer and 0.2-1 part of a chain extender; and the high barrier coating is a water-resistant modified PVA coating. Production procedures are simple, green and environmental protection materials are used, and the film is excellent in performance, and still hasa good barrier effect in case of a very thin high-barrier coating.

Description

technical field [0001] The invention relates to the field of film flexible packaging, in particular to a coating-type high-barrier biaxially stretched polylactic acid film and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a polymer obtained by polymerization of lactic acid as the main raw material. The raw material source is sufficient and can be regenerated. The production process of polylactic acid is non-polluting, and the product can be biodegraded to realize the cycle in nature, so it is an ideal green polymer material. In recent years, with the gradual improvement of people's awareness of environmental protection and the continuous increase of white garbage, more and more attention and research have been paid to polylactic acid, and the types of polylactic acid film products in the market have been continuously enriched. [0003] Biaxially oriented polylactic acid film (BOPLA) is a transparent biodegradable polymer film with high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B27/18B32B27/08B32B33/00B29D7/01C09D129/04C09D175/04C09D133/04C09D7/61
CPCB29D7/01B32B27/08B32B27/18B32B27/36B32B33/00B32B2250/244B32B2255/10B32B2255/26B32B2307/73C08L2205/03C09D129/04C09D7/61C09D7/70C08L75/04C08L33/04C08K7/00C08K3/34
Inventor 贾露刘运锦林新土李智尧陈曦廖贵何
Owner 中仑新材料股份有限公司
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