Degradable low-water-vapor-transmittance heat-sealable two-way stretching polylactic acid smoke film and preparation method thereof

A technology of biaxial stretching and polylactic acid, which is applied in the field of flexible packaging, can solve problems such as poor water vapor barrier properties, and achieve the effects of degradable heat sealing performance, high heat sealing strength, and good application prospects

Active Publication Date: 2022-03-18
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

[0006] In order to solve the problem that its water vapor barrier property of the existing BOPLA film mentioned in the background technology is poor and is not suitable for packaging of products requiring high water vapor barrier performance; the present invention Provide a degradable low water vapor transmission rate heat-sealable biaxially oriented polylactic acid cigarette film, the film structure of which includes a BOPLA film layer and a water vapor barrier layer;

Method used

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  • Degradable low-water-vapor-transmittance heat-sealable two-way stretching polylactic acid smoke film and preparation method thereof
  • Degradable low-water-vapor-transmittance heat-sealable two-way stretching polylactic acid smoke film and preparation method thereof
  • Degradable low-water-vapor-transmittance heat-sealable two-way stretching polylactic acid smoke film and preparation method thereof

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preparation example Construction

[0036] Specifically, the present invention also provides a method for preparing the degradable low water vapor transmission rate heat-sealable biaxially oriented polylactic acid cigarette film, the steps of which are as follows:

[0037] (1) Preparation of water vapor barrier coating: Add polyurethane polymer coating, inorganic powder, and suspending agent in sequence in a certain weight ratio in the container, stir evenly, then add water, continue stirring evenly, finally add crosslinking agent, and stir evenly Standing and defoaming to obtain the water vapor barrier coating;

[0038] (2) Weigh crystalline polylactic acid slices, non-crystalline polylactic acid slices, anti-blocking agents and smoothing agents according to a certain weight ratio, and put them into a twin-screw extruder to obtain inner layer 13 through melt blending, extrusion, and granulation masterbatch, spare;

[0039] (3) Weigh crystalline polylactic acid slices, non-crystalline polylactic acid slices, an...

Embodiment 1

[0046] The film layer structure of the biaxially stretched polylactic acid cigarette film includes a BOPLA film layer 10 and a water vapor barrier layer 20; the BOPLA film layer 10 is followed by a surface layer 11, a core layer 12 and an inner layer 13 from bottom to top, which are obtained through three layers. Layer casting co-extrusion and biaxial stretching are made, and the inner layer 13 in the BOPLA film layer 10 is connected with the water vapor barrier layer 20; wherein, the thickness of the BOPLA film layer 10 is 15um; the water vapor barrier layer 20 The thickness is 0.5um;

[0047] The water vapor barrier layer 20 is composed of polyurethane polymer coating, inorganic powder, suspending agent, crosslinking agent and water in a mass ratio of 85.0:5.89:0.50:1.00:33.7.

[0048] In parts by weight, the raw material components of the inner layer 13 of the BOPLA film layer 10 include 75.0 parts of crystalline polylactic acid slices, 23.0 parts of non-crystalline polylac...

Embodiment 2

[0060] The difference between this embodiment and embodiment 1 is only:

[0061] The water vapor barrier layer 20 is composed of polyurethane polymer coating, inorganic powder, suspending agent, crosslinking agent and water in a mass ratio of 85.0:8.50:1.25:2.50:43.5;

[0062] In parts by weight, the raw material components of the inner layer 13 of the BOPLA film layer 10 include 85.0 parts of crystalline polylactic acid slices, 14.4 parts of non-crystalline polylactic acid slices, 0.50 parts of opening agent and 0.10 parts of smooth agent; the core layer 12 is composed of crystalline polylactic acid slices; the raw material components of the surface layer 11 include 90.0 parts of crystalline polylactic acid slices, 9.4 parts of non-crystalline polylactic acid slices, 0.50 parts of opening agent and 0.10 parts of slip agent.

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Abstract

The invention relates to the technical field of flexible packaging, in particular to a degradable low-water-vapor-transmittance heat-sealable two-way stretching polylactic acid cigarette film and a preparation method thereof. The film layer structure of the biaxially oriented polylactic acid smoke film comprises a BOPLA film layer and a water vapor barrier layer, the water vapor barrier layer comprises the following raw material components: a polyurethane polymer coating, inorganic powder, a suspending agent, a cross-linking agent and water; the mass ratio of the polyurethane polymer coating to the inorganic powder to the suspending agent to the cross-linking agent to the water is (65.5 to 85.0) to (5.89 to 8.50) to (0.50 to 1.25) to (1.00 to 2.50) to (33.7 to 43.5). The two-way stretching emulsion polymer film is low in water vapor transmission rate, has excellent water vapor barrier property, has excellent properties such as low haze and high heat sealing strength, has degradability and good heat sealing property, and has a very good application prospect in product packaging with high requirements on the water vapor barrier property.

Description

technical field [0001] The invention relates to the technical field of flexible packaging, in particular to a degradable low water vapor transmission rate heat-sealable biaxially stretched polylactic acid cigarette film and a preparation method thereof. Background technique [0002] As a new type of material, plastic products are characterized by lightness, durability, and low cost. They are widely used all over the world and are growing every year. For example, in cigarette packaging, BOPP film is currently the most widely used. Although BOPP film has the advantages of good transparency, good dimensional stability, and good water vapor barrier, but because BOPP film cannot be degraded by nature, and cigarettes are used in people's lives If the amount of use in the film is large, the BOPP film used in the packaging box will be thrown away randomly, causing environmental pollution. [0003] Polylactic acid (PLA) is a polymer obtained by polymerization of lactic acid as the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B27/06B32B33/00C08L67/04C09D175/06C09D7/61C08J5/18B29D7/01B29C55/02B29C55/14
CPCB32B27/36B32B27/08B32B33/00B29D7/01B29C55/023B29C55/143C08J5/18C09D175/06C09D7/61C08J2367/04C08J2467/04C08K2003/2227C08K2003/222C08K2003/2272B32B2307/716B32B2307/7265B32B2255/10B32B2255/26C08K3/36C08K3/22Y02W90/10
Inventor 李智尧魏婕吴腾达贾露廖贵何陈曦郑伟
Owner 厦门长塑实业有限公司
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