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Composite film, preparation method thereof and plastic film product

A technology of composite films and raw materials, applied in the field of plastic films, can solve the problems of poor compatibility, delamination damage, inability to meet the application requirements of shopping bags, etc.

Pending Publication Date: 2021-04-20
佛山(华南)新材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found through experiments that the inner and outer layer materials PLA, PBAT and the middle layer material PVA have poor compatibility. Whether it is obtained by hot pressing or co-extrusion, the multilayer film lacks interlayer bonding, especially after heat sealing. The layers are easy to separate, and are prone to delamination and damage after being stressed or stretched, which cannot meet the application requirements of shopping bags, inflatable films, etc. that require force and load bearing

Method used

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  • Composite film, preparation method thereof and plastic film product
  • Composite film, preparation method thereof and plastic film product
  • Composite film, preparation method thereof and plastic film product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides a composite film, which includes a heat-sealing layer, an adhesive layer and a support layer laminated in sequence, and is specifically prepared by the following steps:

[0036] (1) Preparation of heat-sealing layer materials: Weigh the raw materials of each component according to the composition ratio in Table 1, and put them into a high-speed mixer for homogeneous mixing. The speed of the mixer is 800-2000r / min, and the mixing time is 0.5-1min. The mixture was dried at 105°C for 2 hours, and then put into a twin-screw extruder for melt kneading and extrusion, and the extrusion temperature was 190°C. The extruded samples are transported by steel belt air-cooled cooling, and pelletized for later use.

[0037] Preparation of the adhesive layer material: Weigh the raw materials of each component according to the composition ratio in Table 1, and put them into a high-speed mixer for homogeneous mixing. The speed of the mixer is 800-2000r / min, and...

Embodiment 2

[0045] This embodiment provides a composite film, which includes a heat-sealing layer, an adhesive layer and a support layer laminated in sequence, and is specifically prepared by the following steps:

[0046] (1) Weigh the raw materials of each component according to the composition ratio in Table 2, and prepare the heat-sealing layer material, the bonding layer material and the supporting layer material respectively according to the method of Example 1.

[0047] (2) Preparation of composite film: Add the above-mentioned layers of materials into the three-layer co-extrusion casting equipment, adjust the temperature of the screw to 220 ° C, the speed of the casting roll to 60 m / min, and the temperature of the casting roll to 40 ° C, and Adjust the thickness ratio of the three layers to heat seal layer: adhesive layer: support layer is 50:20:30, adopt the roller cooling method, the speed of the cooling roller is 60m / min, the temperature is 20 ℃, after cutting and winding Obtain...

Embodiment 3

[0052] This embodiment provides a composite film, which includes a heat-sealing layer, an adhesive layer and a support layer laminated in sequence, and is specifically prepared by the following steps:

[0053] (1) Weigh the raw materials of each component according to the composition ratio in Table 3, and prepare the heat-sealing layer material, the bonding layer material and the supporting layer material respectively according to the method of Example 1.

[0054] (2) Preparation of composite film: Add the above-mentioned layers of materials into a three-layer co-extrusion casting equipment, adjust the temperature of the screw to 190°C, use air-cooled cooling, the temperature of the cold air is 15°C, and the inflation ratio is 2.5, after cutting 1. Obtain the degradable multilayer composite film of this embodiment after winding.

[0055] Table 3 Components and configuration methods of each layer of materials in the composite film of Example 3

[0056]

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Abstract

The invention discloses a composite film, a preparation method thereof and a plastic film product. The composite film comprises a heat sealing layer, a bonding layer and a supporting layer which are sequentially stacked, wherein based on the mass of the heat sealing layer, the heat sealing layer is prepared from a heat sealing layer raw material comprising 48-100 parts by mass of PBAT, 0-30 parts by mass of a filler, 0-20 parts by mass of a biodegradable material and 0-2 parts by mass of a processing aid, the bonding layer is prepared from a bonding layer raw material comprising bonding resin, the bonding resin is copolyester containing an active group, and the active group is a carboxyl or anhydride group; wherein the supporting layer is prepared from the following raw materials in parts by mass: 68-100 parts of thermoplastic modified polyvinyl alcohol, 0-20 parts of filler, 0-10 parts of biodegradable material and 0-2 parts of processing aid. The composite film provided by the invention has good mechanical properties, layers are not easy to separate, and the composite film has good application prospects.

Description

technical field [0001] The invention relates to the technical field of plastic films, in particular to a composite film, a preparation method thereof and a plastic film product. Background technique [0002] With the development of society and economy, more and more plastic products are used. Among them, plastic film products are widely used, and can be found in various production industries such as food, packaging, logistics express, electronics, transportation, and even life. Traditional plastic film products are mostly disposable products, which are difficult to reuse and self-consumption in nature is also very difficult, resulting in a large amount of waste plastic film being discharged into nature, causing severe environmental problems. Therefore, non-degradable plastic films bear the brunt of the plastic products that are prohibited from being produced and sold in the national "plastic ban order". It is an important solution to develop new degradable plastic films tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/36B32B27/30B32B27/18B32B7/12B32B37/12B32B37/15C08J5/18C08L67/02C08L29/04C08L3/02C08L51/06C08L67/04C08L23/08C08L1/02B29C65/02B29C65/48B29C48/05B29C48/18B29C48/25
Inventor 刘耀春刘嘉贤圣桂金樊小军李爽贾芳
Owner 佛山(华南)新材料研究院
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