WO2022134790A1 - 一种塑料膜和塑料袋及其制备方法 - Google Patents

一种塑料膜和塑料袋及其制备方法 Download PDF

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Publication number
WO2022134790A1
WO2022134790A1 PCT/CN2021/124852 CN2021124852W WO2022134790A1 WO 2022134790 A1 WO2022134790 A1 WO 2022134790A1 CN 2021124852 W CN2021124852 W CN 2021124852W WO 2022134790 A1 WO2022134790 A1 WO 2022134790A1
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WIPO (PCT)
Prior art keywords
film
plastic film
cellulose
polylactic acid
polyvinylidene chloride
Prior art date
Application number
PCT/CN2021/124852
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English (en)
French (fr)
Inventor
邱建汉
梁国强
汤晓
Original Assignee
广州亚俊氏真空科技股份有限公司
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Filing date
Publication date
Application filed by 广州亚俊氏真空科技股份有限公司 filed Critical 广州亚俊氏真空科技股份有限公司
Priority to EP21908791.3A priority Critical patent/EP4249558A4/en
Publication of WO2022134790A1 publication Critical patent/WO2022134790A1/zh
Priority to US18/214,518 priority patent/US20230339223A1/en

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    • C08J5/18—Manufacture of films or sheets
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    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2427/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08J2427/08—Homopolymers or copolymers of vinylidene chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

  • the invention relates to the field of polymer composite materials, in particular to a plastic film, a plastic bag and a preparation method thereof.
  • the common food packaging bags on the market are mainly made of PA, metal film (such as aluminum foil), PE, RCPP and other materials.
  • the existing food packaging bags are not biodegradable, have poor water resistance, poor air tightness, and need to be improved in mechanical properties.
  • the purpose of the present invention is to overcome the deficiencies of the prior art and provide a plastic film, a plastic bag and a preparation method thereof.
  • the technical scheme adopted in the present invention is: a plastic film, the plastic film includes a film A and a film B, and the film A includes polylactic acid, polyadipate/butylene terephthalate, and at least one of PBS polymers; the film B includes a base layer and a coating layer, the coating layer is attached to surround the base layer, and the film A and the film B are laminated and formed;
  • the coating material is polyvinylidene chloride and the base material is cellulose, or the coating material is alumina and the base material is polylactic acid, or the coating material is polyvinylidene chloride and the The base material is polylactic acid, or the coating material is alumina and the base material is cellulose.
  • Plastic film has excellent water resistance, air tightness and mechanical properties, and is biodegradable, and can be widely used in food packaging bags, overcoming the inability of existing food packaging bags to biodegrade, poor water resistance, poor air tightness, and mechanical properties. issues to be improved.
  • the film includes polylactic acid and polyadipate/butylene terephthalate.
  • the inventor found that the plastic film obtained by combining polylactic acid and polyadipate/butylene terephthalate for the preparation of film A has better water resistance, better gas resistance than single-component film A. dense mechanical properties and biodegradability.
  • the inventors found through research that when the weight ratio of each component in the plastic film meets the above conditions, it has more excellent water resistance, air tightness, mechanical properties and biodegradability.
  • the inventors found through research that when the weight ratio of each component in the plastic film meets the above conditions, it has more excellent water resistance, air tightness, mechanical properties and biodegradability.
  • the inventors found through research that when the weight ratio of each component in the plastic film meets the above conditions, it has more excellent water resistance, air tightness, mechanical properties and biodegradability.
  • the inventors have found through research that when the weight ratio of each component in the plastic film meets the above conditions, it has more excellent waterproofness, airtightness, mechanical properties and biodegradability.
  • the surface of the plastic film is provided with uneven lines, the roughness Ra of the lines is 0.1-0.2 mm, the distance between the adjacent peaks and troughs of the lines is 1.2-4 mm, and the lines are adjacent to each other.
  • the height difference between the crest and the trough is 0.18 to 0.4 mm.
  • the plastic film After the above-mentioned lines are arranged on the surface of the plastic film, it is prepared into a plastic bag, which can be vacuumized.
  • the lines on the surface of the plastic film overlap to form a gas passage, which can extract the gas in the plastic bag to a greater extent, and to a greater extent. Decrease the vacuum level that the plastic bag can achieve.
  • the present invention also provides a method for preparing any of the above-mentioned plastic films, the method comprising the following steps:
  • the present invention also provides a plastic bag prepared from any one of the above-mentioned plastic films.
  • the present invention also provides the application of the above-mentioned plastic bag in food packaging.
  • the present invention provides a plastic film, a plastic bag and a preparation method thereof.
  • the plastic film of the present invention combines polylactic acid, polyadipic acid/butylene terephthalate, and PBS polymer in After at least one of them is compounded with cellulose film and polyvinylidene chloride and prepared into a plastic film, it is found that the plastic film has excellent waterproofness, air tightness and mechanical properties, and is biodegradable, and can be widely used in food packaging bags. It overcomes the problems that the existing food packaging bags cannot be biodegraded, have poor water resistance, poor air tightness, and need to be improved in mechanical properties.
  • the plastic film includes a film A and a film B, the film A is made of polylactic acid and polyadipate/butylene terephthalate; the film B includes cellulose A film base layer and a coating layer, the coating layer is attached to surround the cellulose film base layer, the coating material is polyvinylidene chloride, the film A and the film B are laminated and formed after being glued together; the Glue accounts for 0.9% of the weight of the plastic film;
  • the surface of the plastic film is provided with uneven lines, the roughness Ra of the lines is 0.1-0.2 mm, the distance between the adjacent peaks and troughs of the lines is 1.2-4 mm, and the adjacent peaks and troughs of the lines are 1.2-4 mm. The height difference between them is 0.18 to 0.4 mm.
  • the preparation method of the plastic film of the present embodiment comprises the following steps:
  • the plastic film is obtained by laminating the film A and the film B through an adhesive and embossing.
  • the plastic film includes a film A and a film B, the film A is made of polylactic acid and polyadipate/butylene terephthalate; the film B includes cellulose A film base layer and a coating layer, the coating layer is attached to surround the cellulose film base layer, the coating material is polyvinylidene chloride, the film A and the film B are laminated and formed; the glue occupies the plastic 1.2% of film weight;
  • the surface of the plastic film is provided with uneven lines, the roughness Ra of the lines is 0.1-0.2 mm, the distance between the adjacent peaks and troughs of the lines is 1.2-4 mm, and the adjacent peaks and troughs of the lines are 1.2-4 mm. The height difference between them is 0.18 to 0.4 mm.
  • the preparation method of the plastic film of the present embodiment comprises the following steps:
  • the plastic film is obtained by laminating the film A and the film B through an adhesive and embossing.
  • the film A is composed of polylactic acid, and the film A does not include polyadipate/butylene terephthalate .
  • the plastic film of Example 2 was tested for biodegradability according to the standard EU13432-2012, and the plastic film of Example 2 was tested in parallel.

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Abstract

本发明提供了一种塑料膜，所述塑料膜包括薄膜A和薄膜B，所述薄膜A包括聚乳酸、聚己二酸/对苯二甲酸丁二酯、以及PBS聚合物中的至少一种；所述薄膜B包括基层和涂层，所述涂层贴合包围所述基层，所述薄膜A和薄膜B层压成型；所述涂层材料为聚偏二氯乙烯且所述基层材料为纤维素膜；或者涂层材料为氧化铝且所述基层材料为聚乳酸。本发明的塑料膜将聚乳酸、聚己二酸/对苯二甲酸丁二酯、以及PBS聚合物中的至少一种与纤维素膜、聚偏二氯乙烯复合制备为塑料膜后，发现塑料膜具有优异的防水性、气密性和机械性能，而且可生物降解，可以在食品包装袋广泛应用，克服了现有的食品包装袋无法生物降解、防水性差、气密性差、和机械性能有待提升的问题。

Description

一种塑料膜和塑料袋及其制备方法 技术领域
本发明涉及高分子复合材料领域，具体涉及一种塑料膜和塑料袋及其制备方法。
背景技术
目前市场上常见的食品包装袋主要由PA、金属膜(如铝箔)、PE、RCPP等材料制作而成。但是现有的食品包装袋无法生物降解、防水性差、气密性差、而且机械性能有待提升。
发明内容
本发明的目的在于克服现有技术存在的不足之处而提供一种塑料膜和塑料袋及其制备方法。
为实现上述目的，本发明采取的技术方案为：一种塑料膜，所述塑料膜包括薄膜A和薄膜B，所述薄膜A包括聚乳酸、聚己二酸/对苯二甲酸丁二酯、以及PBS聚合物中的至少一种；所述薄膜B包括基层和涂层，所述涂层贴合包围所述基层，所述薄膜A和薄膜B层压成型；
所述涂层材料为聚偏二氯乙烯且所述基层材料为纤维素、或者涂层材料为氧化铝且所述基层材料为聚乳酸、或者所述涂层材料为聚偏二氯乙烯且所述基层材料为聚乳酸、或者涂层材料为氧化铝且所述基层材料为纤维素。
发明人通过研究发现，将聚乳酸、聚己二酸/对苯二甲酸丁二酯、以及PBS聚合物中的至少一种与纤维素膜、聚偏二氯乙烯复合制备为塑料膜后，发现塑料膜具有优异的防水性、气密性和机械性能，而且可生物降解，可以在食品包装袋广泛应用，克服了现有的食品包装袋无法生物降解、防水性差、气密性差、和机械性能有待提升的问题。
优选地，所述薄膜包括聚乳酸和聚己二酸/对苯二甲酸丁二酯。
发明人通过研究发现，将聚乳酸和聚己二酸/对苯二甲酸丁二酯搭配用于制备薄膜A，相比于单一组分的薄膜A得到的塑料膜具有更优异的防水性、气密性机械性能和生物降解性。
优选地，所述塑料膜中聚乳酸、聚己二酸/对苯二甲酸丁二酯、纤维素和聚偏二氯乙烯的重量比为聚乳酸：聚己二酸/对苯二甲酸丁二酯：纤维素：聚偏二氯乙烯＝(10～20):(45～65)：(20～35)：(2～5)。
优选地，所述塑料膜中聚乳酸、聚己二酸/对苯二甲酸丁二酯、纤维素和聚偏二氯乙烯的重量比为聚乳酸：聚己二酸/对苯二甲酸丁二酯：纤维素：聚偏二氯乙烯＝(12～18):(50～60)：(20～35)：(2～5)。
发明人通过研究发现塑料膜中各组分的重量比符合上述条件时，具有更优异的防水性、气密性机械性能和生物降解性。
优选地，所述塑料膜中聚乳酸、聚己二酸/对苯二甲酸丁二酯、纤维素和聚偏二氯乙烯的重量比为聚乳酸：聚己二酸/对苯二甲酸丁二酯：纤维素：聚偏二氯乙烯＝(12～18):(55～60)：(24～32)：(2～5)。
发明人通过研究发现塑料膜中各组分的重量比符合上述条件时，具有更优异的防水性、气密性机械性能和生物降解性。
优选地，所述塑料膜中聚乳酸、聚己二酸/对苯二甲酸丁二酯、纤维素和聚偏二氯乙烯的重量比为聚乳酸：聚己二酸/对苯二甲酸丁二酯：纤维素：聚偏二氯乙烯＝(12～18):(55～60)：(24～32)：(3～4)。
发明人通过研究发现塑料膜中各组分的重量比符合上述条件时，具有更优异的防水性、气密性机械性能和生物降解性。
优选地，所述塑料膜中聚乳酸、聚己二酸/对苯二甲酸丁二酯、纤维素和聚偏二氯乙烯的重量比为聚乳酸：聚己二酸/对苯二甲酸丁二酯：纤维素：聚偏二氯乙烯＝(15～18):(55～60)：(24～28)：(3～4)。
发明人通过研究发现塑料膜中各组分的重量比符合上述条件时，具有更优 异的防水性、气密性机械性能和生物降解性。
优选地，所述塑料膜表面设置有凹凸不平的纹路，所述纹路的粗糙度Ra为0.1～0.2mm，所述纹路相邻波峰和波谷之间的距离为1.2～4mm，所述纹路相邻波峰和波谷之间的高度差为0.18～0.4mm。
在塑料膜表面设置上述纹路后，制备为塑料袋，可以进行抽真空的操作，塑料膜表面的纹路交叠形成气体通路，可以将塑料袋中的气体更大程度的抽离，更大程度地降低塑料袋可以达到的抽真空的真空度。
本发明还提供上述任一所述塑料膜的制备方法，所述方法包括以下步骤：
(1)按照重量配比将聚乳酸、聚己二酸/对苯二甲酸丁二酯、以及PBS聚合物中的至少一种混炼后挤压成薄膜A；
(2)按照重量配比将纤维素混炼后挤压成薄膜B的纤维素膜基层，将聚偏二氯乙烯在纤维素膜基层表面形成涂层，得到薄膜B；
(3)将薄膜A和薄膜B通过胶黏剂层压为所述塑料膜。
本发明还提供上述任一所述塑料膜制备的塑料袋。
本发明还提供上述所述塑料袋在食品包装中的应用。
本发明的有益效果在于：本发明提供了一种塑料膜和塑料袋及其制备方法，本发明的塑料膜将聚乳酸、聚己二酸/对苯二甲酸丁二酯、以及PBS聚合物中的至少一种与纤维素膜、聚偏二氯乙烯复合制备为塑料膜后，发现塑料膜具有优异的防水性、气密性和机械性能，而且可生物降解，可以在食品包装袋广泛应用，克服了现有的食品包装袋无法生物降解、防水性差、气密性差、和机械性能有待提升的问题。
具体实施方式
为更好的说明本发明的目的、技术方案和优点，下面将结合具体实施例对本发明作进一步说明。
实施例1
作为本发明实施例的一种塑料膜，所述塑料膜包括薄膜A和薄膜B，所述薄膜A由聚乳酸和聚己二酸/对苯二甲酸丁二酯；所述薄膜B包括纤维素膜基层和涂层，所述涂层贴合包围所述纤维素膜基层，所述涂层材料为聚偏二氯乙烯，所述薄膜A和薄膜B通过胶水贴合后层压成型；所述胶水占所述塑料膜重量的0.9％；
所述塑料膜中聚乳酸、聚己二酸/对苯二甲酸丁二酯、纤维素和聚偏二氯乙烯的重量比为聚乳酸：聚己二酸/对苯二甲酸丁二酯：纤维素：聚偏二氯乙烯＝14.8:59.2:22.8:2.3，塑料膜的厚度为75μm；
所述塑料膜表面设置有凹凸不平的纹路，所述纹路的粗糙度Ra为0.1～0.2mm，所述纹路相邻波峰和波谷之间的距离为1.2～4mm，所述纹路相邻波峰和波谷之间的高度差为0.18～0.4mm。
本实施例塑料膜的制备方法，所述方法包括以下步骤：
(1)按照重量配比将聚乳酸、聚己二酸/对苯二甲酸丁二酯混炼后挤压成薄膜A；
(2)按照重量配比将纤维素混炼后挤压成薄膜B的纤维素膜基层，将聚偏二氯乙烯乳液涂布在纤维素膜基层表面形成涂层，烘箱烘干固化定型，得到薄膜B；
(3)将薄膜A和薄膜B通过胶黏剂层压，进行压纹得到所述塑料膜。
实施例2
作为本发明实施例的一种塑料膜，所述塑料膜包括薄膜A和薄膜B，所述薄膜A由聚乳酸和聚己二酸/对苯二甲酸丁二酯；所述薄膜B包括纤维素膜基层和涂层，所述涂层贴合包围所述纤维素膜基层，所述涂层材料为聚偏二氯乙烯，所述薄膜A和薄膜B层压成型；所述胶水占所述塑料膜重量的1.2％；
所述塑料膜中聚乳酸、聚己二酸/对苯二甲酸丁二酯、纤维素和聚偏二氯乙烯的重量比为聚乳酸：聚己二酸/对苯二甲酸丁二酯：纤维素：聚偏二氯乙烯＝13.3:52.5:30:3，塑料膜的厚度为110μm；
所述塑料膜表面设置有凹凸不平的纹路，所述纹路的粗糙度Ra为0.1～0.2mm，所述纹路相邻波峰和波谷之间的距离为1.2～4mm，所述纹路相邻波峰和波谷之间的高度差为0.18～0.4mm。
本实施例塑料膜的制备方法，所述方法包括以下步骤：
(1)按照重量配比将聚乳酸、聚己二酸/对苯二甲酸丁二酯混炼后挤压成薄膜A；
(2)按照重量配比将纤维素混炼后挤压成薄膜B的纤维素膜基层，将聚偏二氯乙烯乳液涂布在纤维素膜基层表面形成涂层，烘箱烘干固化定型，得到薄膜B；
(3)将薄膜A和薄膜B通过胶黏剂层压，进行压纹得到为所述塑料膜。
对比例1
作为本发明对比例的一种塑料膜，本实施例与实施例1的唯一区别为：所述薄膜A由聚乳酸组成，所述薄膜A不包括聚己二酸/对苯二甲酸丁二酯。
对比例2
作为本发明对比例的一种塑料膜，本实施例与实施例1的唯一区别为：用聚酯树脂替换聚己二酸/对苯二甲酸丁二酯。
对比例3
作为本发明对比例的一种塑料膜，本实施例与实施例1的唯一区别为：用KPT(纤维素和聚偏二氯乙烯涂层)替换聚己二酸/对苯二甲酸丁二酯。
性能测试
1、测试实施例1～2和对比例1～3的塑料膜的氧气透过率和水蒸气透过量。氧气透过率测试方法为：GB/T 1038-2000《塑料薄膜和薄片气体透过性试验方法压差法》试验条件：T＝(23±0.5)℃，RH＝0％，水蒸气透过量的测试方法为GB/T 1037-1988《塑料薄膜和片材透水蒸气性试验方法(杯式法)》试验条件：T＝(38±0.6)℃，RH＝(90±2)％结果如表1所示。
表1 塑料膜的气密性和防水性
Figure PCTCN2021124852-appb-000001
Figure PCTCN2021124852-appb-000002
2、塑料膜的生物降解性能
将实施例2的塑料膜按照标准EU13432-2012进行生物降解性能的检测，平行测试实施例2的塑料膜。
表2 塑料膜的生物降解性
Figure PCTCN2021124852-appb-000003
3、机械性能
测试实施例1和实施例2塑料膜的机械性能如表3所示。
表3 实施例1和实施例2塑料膜的机械性能
样品性能 实施例1 实施例2
热封强度 15.8N/15mm 22.03N/15mm
纵向拉伸率 23.8％ 36.8％
纵向拉伸强度 36.6N/mm 2 40.86N/mm 2
横向拉伸率 94.6％ 74.4％
横向拉伸强度 19.98N/mm 2 23.94N/mm 2
横向直角撕裂力 10.12N 11.73N
横向直角撕裂强度 134.93N/mm 106.63N/mm
纵向直角撕裂力 10.47N 17.37N
纵向直角撕裂强度 139.6N/mm 157.9N/mm
抗摆锤 0.93J 1.13J
摩擦系数(外) 静态0.6动态0.42 静态0.6动态0.42
摩擦系数(内) 静态0.14动态0.12 静态0.14动态0.12
剥离强度 1.73N 1.5N
热封范围 118℃～125℃ 122℃～130℃
最后所应当说明的是，以上实施例仅用以说明本发明的技术方案而非对本发明保护范围的限制，尽管参照较佳实施例对本发明作了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本发明技术方案的实质和范围。

Claims (10)

  1. 一种塑料膜，其特征在于，所述塑料膜包括薄膜A和薄膜B，所述薄膜A包括聚乳酸、聚己二酸/对苯二甲酸丁二酯、以及PBS聚合物中的至少一种；所述薄膜B包括基层和涂层，所述涂层贴合包围所述基层，所述薄膜A和薄膜B层压成型；
    所述涂层材料为聚偏二氯乙烯且所述基层材料为纤维素、或者涂层材料为氧化铝且所述基层材料为聚乳酸、或者所述涂层材料为聚偏二氯乙烯且所述基层材料为聚乳酸、或者涂层材料为氧化铝且所述基层材料为纤维素。
  2. 根据权利要求1所述的塑料膜，其特征在于，所述薄膜包括聚乳酸和聚己二酸/对苯二甲酸丁二酯。
  3. 根据权利要求2所述的塑料膜，其特征在于，所述塑料膜中聚乳酸、聚己二酸/对苯二甲酸丁二酯、纤维素和聚偏二氯乙烯的重量比为聚乳酸：聚己二酸/对苯二甲酸丁二酯：纤维素：聚偏二氯乙烯＝(10～20):(45～65)：(20～35)：(2～5)。
  4. 根据权利要求3所述的塑料膜，其特征在于，所述塑料膜中聚乳酸、聚己二酸/对苯二甲酸丁二酯、纤维素和聚偏二氯乙烯的重量比为聚乳酸：聚己二酸/对苯二甲酸丁二酯：纤维素：聚偏二氯乙烯＝(12～18):(50～60)：(20～35)：(2～5)。
  5. 根据权利要求4所述的塑料膜，其特征在于，所述塑料膜中聚乳酸、聚己二酸/对苯二甲酸丁二酯、纤维素和聚偏二氯乙烯的重量比为聚乳酸：聚己二酸/对苯二甲酸丁二酯：纤维素：聚偏二氯乙烯＝(12～18):(55～60)：(24～32)：(3～4)。
  6. 根据权利要求5所述的塑料膜，其特征在于，所述塑料膜中聚乳酸、聚己二酸/对苯二甲酸丁二酯、纤维素和聚偏二氯乙烯的重量比为聚乳酸：聚己二酸/对苯二甲酸丁二酯：纤维素：聚偏二氯乙烯＝(15～18):(55～60)：(24～28)：(3～4)。
  7. 根据权利要求1-6任一所述塑料膜，其特征在于，所述塑料膜表面设置有凹凸不平的纹路，所述纹路的粗糙度Ra为0.1～0.2mm，所述纹路相邻波峰和波谷之间的距离为1.2～4mm，所述纹路相邻波峰和波谷之间的高度差为0.18～0.4mm。
  8. 如权利要求1-7任一所述塑料膜的制备方法，其特征在于：所述方法包括以下步骤：
    (1)按照重量配比将聚乳酸、聚己二酸/对苯二甲酸丁二酯、以及PBS聚合物中的至少一种混炼后挤压成薄膜A；
    (2)按照重量配比将纤维素混炼后挤压成薄膜B的纤维素膜基层，将聚偏二氯乙烯在纤维素膜基层表面形成涂层，得到薄膜B；(3)将薄膜A和薄膜B通过胶黏剂层压为所述塑料膜。
  9. 如权利要求1-7任一所述塑料膜制备的塑料袋。
  10. 如权利要求9所述塑料袋在食品包装中的应用。
PCT/CN2021/124852 2020-12-24 2021-10-20 一种塑料膜和塑料袋及其制备方法 WO2022134790A1 (zh)

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