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A kind of composite film and preparation method thereof

A technology of composite film and mass parts, applied in the direction of chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of low tensile strength, low elongation at break and impact strength, softness and stiffness of products and poor barrier properties, to achieve the effects of high vertical and horizontal strength, reduced dosage, and high elongation at break

Active Publication Date: 2020-04-17
深圳市正旺环保新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although PLA and PBAT have broad application prospects, they also have significant defects. For example, PLA has extremely low elongation at break and impact strength at room temperature after blown film molding, which is difficult to meet the needs of real life; High elongation at break, but low tensile strength, soft products, poor stiffness and barrier properties, while biodegradable resins are currently expensive, and large-scale promotion is difficult to be accepted by the market

Method used

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  • A kind of composite film and preparation method thereof

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Embodiment 1

[0028] The present embodiment provides a kind of composite film, and the thickness of described composite film is 0.04mm, comprises inner layer, middle layer and outer layer arranged successively, and described inner layer comprises the PBAT of 50 mass parts, the thermoplastic starch of 30 mass parts, 5 Parts by mass of ethylene acrylic resin, 8 parts by mass of nano-calcium carbonate and 1 part by mass of tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer, the middle layer includes 90 parts by mass of low-density polyethylene, 10 parts by mass of Metallocene polyethylene and 5 mass parts of simethicone, the outer layer includes 85 mass parts of PA6 and 5 mass parts of PE-g-MAH, the inner layer: the middle layer: the thickness ratio of the outer layer is 3: 1:1. The metallocene polyethylene in the middle layer has high molecular weight, narrow molecular weight distribution, less branched chain, low density, and high purity. Mixing it with low-density polyeth...

Embodiment 3

[0036] The present embodiment provides a kind of composite film, and the thickness of described composite film is 0.1mm, comprises inner layer, middle layer and outer layer arranged in sequence, and described inner layer comprises the thermoplastic starch of 70 mass parts, the thermoplastic starch of 50 mass parts, 3 The PE-g-GMA of mass parts, the nano barium sulfate of 5 mass parts and the microcrystalline wax of 3 mass parts, described middle layer comprises the low density polyethylene of 80 mass parts, the metallocene polyethylene of 20 mass parts and 2 mass parts polyvinyl alcohol, the outer layer includes 95 parts by mass of PA6 / PA66 and 5 parts by mass of PE-g-MAH, the mass ratio of PA6:PA66 in the PA6 / PA66 is 40:45, and the inner layer: The thickness ratio of middle layer: outer layer is 2.5:0.8:1.5.

[0037]The present embodiment also provides a kind of preparation method of above-mentioned composite film, the above-mentioned 70 mass parts of PBAT, 50 mass parts of t...

Embodiment 4

[0039] The present embodiment provides a kind of composite film, and the thickness of described composite film is 0.07mm, comprises inner layer, middle layer and outer layer arranged in sequence, and described inner layer comprises the PBAT of 60 mass parts, the thermoplastic starch of 40 mass parts, 4 parts by mass of siloxane, 7 parts by mass of nano kaolin and 2 parts by mass of ethylene-tetrafluoroethylene copolymer, the middle layer includes 85 parts by mass of low density polyethylene, 15 parts by mass of metallocene polyethylene and 4 parts by mass of Parts of sodium carboxymethyl starch, the outer layer includes 90 parts by mass of PA6 / PA66 and 8 parts by mass of PE-g-ST, and the mass ratio of PA6:PA66 in the PA6 / PA66 is 75:25, the The thickness ratio of inner layer: middle layer: outer layer is 3:1.5:0.8.

[0040] This embodiment also provides a method for preparing the above-mentioned composite film. The above-mentioned inner layer materials, middle layer materials a...

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Abstract

The invention discloses a composite thin film and a method for preparing the same. The composite thin film and the method have the advantages that the composite thin film is made of biodegradable plastics and biology-based polyamide and accordingly is degradable, green and environmentally friendly; middle layers of the composite thin film are made of mixtures of low-density polyethylene and metallocene polyethylene, and accordingly the problem of vulnerability to longitudinal destruction due to inconsistency of the strength in longitudinal and transverse directions in film blowing procedures due to single low-density polyethylene can be solved; different formulas for inner layers, the middle layers and outer layers are designed, and accordingly the composite thin film is high in longitudinal and transverse strength, elongation at breakage and impact strength.

Description

technical field [0001] The invention relates to the field of thin films, in particular to a composite thin film and a preparation method thereof. Background technique [0002] With the gradual reduction of petroleum resources, it is already a global problem to find alternatives to petroleum. Renewable resources derived from nature have the characteristics of green, environmental protection and sustainable development and have gained unprecedented development opportunities. Biodegradable materials are being used by the world Researchers from all over the world attach great importance to it. Especially in the past 5 years, bio-based materials have been more publicly demonstrated, polylactic acid (PLA), polycaprolactone (PCL), aliphatic-aromatic copolyester (PBAT), polybutylene Cost-effective bioplastics such as butanediol bis-acid (PBS) have been introduced to the market and are widely used in food packaging, containers, electronic product components and other fields. PLA is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/34B32B27/18B32B27/08B32B27/32B32B27/36B32B33/00C08L67/02C08L3/02C08L23/08C08L27/18C08L23/06C08L83/04C08L77/02C08L51/06C08L91/06C08L29/04C08L77/06C08L3/08C08K3/26C08K3/30C08K3/34B29C55/28B29C48/18
Inventor 张坚洪
Owner 深圳市正旺环保新材料有限公司
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