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High-barrier polylactic acid film and preparation method thereof

A polylactic acid, high-barrier technology, applied in chemical instruments and methods, unsaturated alcohol copolymer adhesives, adhesive types, etc., can solve poor barrier properties, low oxygen barrier properties, and limit the application of polylactic acid films, etc. problem, to achieve the effect of ensuring degradability and solving poor barrier

Active Publication Date: 2021-04-09
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

However, its barrier property is poor, and its barrier property to oxygen is not high, which greatly limits the application of polylactic acid film.

Method used

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  • High-barrier polylactic acid film and preparation method thereof
  • High-barrier polylactic acid film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, a high-barrier polylactic acid film is composed of the following mass percentages: first surface layer 1 polylactic acid 99.4%, anti-blocking agent cross-linked polymethyl methacrylate particles 0.5%, erucamide 0.1%; The junction layer 2 is composed of 43% polylactic acid, 55% polyvinyl alcohol, and 2% ethylene-methyl acrylate copolymer; the barrier layer 3 is composed of 100% polyvinyl alcohol; the second adhesive layer 4 is composed of 43% polylactic acid, polyvinyl alcohol Vinyl alcohol 55%, ethylene-methyl acrylate copolymer 2%; the second surface layer 5 polylactic acid 99.4%, blocking agent cross-linked polymethyl methacrylate particles 0.5%, erucamide 0.1%. The thicknesses of the five layers are 10um / 5um / 5um / 5un / 10um respectively.

Embodiment 2

[0043]The difference between Example 2 and Example 1 is that this example is a high-barrier polylactic acid film, which is composed of the following mass percentages: first surface layer 1 polylactic acid 99.6%, anti-blocking agent cross-linked polymethyl methacrylate particles 0.2% , composed of 0.2% erucamide; the first bonding layer 2 is composed of 23% polylactic acid, 74% polyvinyl alcohol, and 3% ethylene-methyl acrylate copolymer; the barrier layer 3 is composed of 100% polyvinyl alcohol; the second The adhesive layer 4 is composed of 23% polylactic acid, 74% polyvinyl alcohol, and 3% ethylene-methyl acrylate copolymer; the second surface layer 5 is 99.6% polylactic acid, and 0.2% of cross-linked polymethyl methacrylate particles, Composition of erucamide 0.2%. The thickness of the five layers are 12um / 5um / 4um / 5un / 12um respectively.

Embodiment 3

[0045] The difference between embodiment 3 and embodiment 1 is: this embodiment is a kind of high barrier polylactic acid film, which is composed of the following mass percentages: the first surface layer 1 polylactic acid 99.4%, anti-blocking agent cross-linked polymethyl methacrylate particles 0.3% , composed of 0.3% erucamide; the first bonding layer 2 is composed of 32% polylactic acid, 65% polyvinyl alcohol, and 3% ethylene-methyl acrylate copolymer; the barrier layer 3 is composed of 100% polyvinyl alcohol; the second The adhesive layer 4 is composed of 32% polylactic acid, 65% polyvinyl alcohol, and 3% ethylene-methyl acrylate copolymer; the second surface layer 5 is 99.4% polylactic acid, and 0.3% of cross-linked polymethyl methacrylate particles of the blocking agent. Composition of erucamide 0.3%. The thickness of the five layers are 8um / 6um / 4um / 6un / 8um respectively.

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Abstract

The invention discloses a high-barrier polylactic acid film and a preparation method thereof. The high-barrier polylactic acid film sequentially consists of a first surface layer, a first bonding layer, a barrier layer, a second bonding layer and a second surface layer. The first surface layer is composed of, in percentage by mass, 99.2 to 99.7 percent of polylactic acid, 0.2 to 0.5 percent of an anti-blocking agent and 0.1 to 0.3 percent of a slipping agent. The first bonding layer is composed of, in percentage by mass, 21 to 44 percent of polylactic acid, 55 to 74 percent of polyvinyl alcohol and 1 to 5 percent of a compatilizer. The barrier layer is composed of, in percentage by mass, 100% of polyvinyl alcohol. The second bonding layer is composed of, in percentage by mass, 21 to 44 percent of polylactic acid, 55 to 74 percent of polyvinyl alcohol and 1 to 5 percent of a compatilizer. The second surface layer is composed of, in percentage by mass, 99.2 to 99.7 percent of polylactic acid, 0.2 to 0.5 percent of the anti-blocking agent and 0.1 to 0.3 percent of the slipping agent. The film disclosed by the invention is prepared by adopting a step-by-step two-way stretching process, and the obtained polylactic acid film has excellent barrier properties and keeps good mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of polymer material films, and in particular relates to a high-barrier polylactic acid film and a preparation method thereof. Background technique [0002] While traditional petroleum-based polymer materials have brought countless conveniences to people, they have also brought many burdens to the environment. "White pollution" is becoming an increasingly serious problem. Polylactic acid is a new degradable plastic with corn starch as the main raw material, which has good biocompatibility and biodegradability, so it has received more and more attention. [0003] How to block oxygen is an important topic in the field of soft food packaging. Oxygen in the air will have a negative impact on the quality of most foods. Oxygen will destroy the nutrients in the food, make the oil in the food oxidize and produce peroxide, so that the food will deteriorate and expire. [0004] As a new type of degradable film materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/30B32B27/36B32B7/12C09J129/04C09J167/04
CPCB32B27/08B32B27/306B32B27/36B32B7/12C09J129/04C08L67/04
Inventor 陈曦贾露李智尧郑伟牟青英
Owner 厦门长塑实业有限公司
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