A kind of hot-melt sealant film and preparation method thereof

A technology of hot-melt sealing and hot-melt adhesive layer, which is used in chemical instruments and methods, household seals, flat products, etc. Insufficient adhesive strength on the back side, to achieve the effect of low production cost, high material utilization rate and good storage performance

Active Publication Date: 2022-05-10
CIXI LANXING PLASTIC & RUBBER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional hot-melt sealant film includes a base layer and a hot-melt adhesive layer arranged on the surface of the base layer. During production, the hot-melt adhesive is usually coated on the surface of the base layer by gluing. This method requires the preparation of the base layer, and then apply glue, it is impossible to realize the one-step forming of the hot melt sealing film, and the glue is prone to sticking during the glue application process, resulting in difficulty in coating and uneven glue, resulting in hot melt adhesive layer Poor bonding ability with substrate layer, easy to degumming
In addition, the traditional hot-melt sealant film also has the problem of insufficient adhesive strength on the back side

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The invention provides a method for preparing a hot-melt sealant film, comprising the following steps:

[0028] The hot-melt adhesive layer material, the base layer material and the back adhesive layer material are subjected to multi-layer co-extrusion to obtain a hot-melt sealant film; Adhesive layer and back adhesive layer.

[0029] In the present invention, the hot melt adhesive layer material is a first copolymer, and the first copolymer is preferably an EVA (ethylene-vinyl acetate copolymer) material with a VA (vinyl acetate) content of 23 to 52 wt%. It is more preferably an EVA material with a VA content of 30 to 50 wt %; the melting point of the first copolymer is preferably 45 to 72°C, more preferably 50 to 70°C, and the melt index is preferably 18 to 180g / 10min, more preferably 25 to 150 g / 10 min, more preferably 50 to 80 g / 10 min. In the present invention, the material selected for the hot-melt adhesive layer has a high viscosity and a high melting index, ca...

Embodiment 1

[0053] It adopts a three-layer structure of hot melt adhesive layer, base layer and back adhesive layer. The hot melt adhesive layer is made of EVA material with a VA content of 30wt%, a melting point of 50°C, and a melting index of 50g / 10min; the base layer is made of polyethylene copolymer. Mixed modified material, the preparation method is: using low-density polyethylene and linear low-density polyethylene materials according to the mass ratio of 25:75, fully mixed evenly, and then placed in a screw extruder for extrusion molding; the back adhesive layer is VA Content is 18%, and melt index is the EVA material of 3g / 10min; Wherein, the mass fraction of hot-melt adhesive layer is 30%, the mass fraction of matrix layer is 50%, and the mass fraction of back adhesive layer is 20%.

[0054] Using 3 screw extruders, add the hot melt adhesive layer, base layer and back adhesive layer into three screw extruders respectively for multi-layer co-extrusion, wherein the extrusion tempera...

Embodiment 2

[0056] It adopts a three-layer structure of hot melt adhesive layer, base layer and back adhesive layer, among which the hot melt adhesive layer is made of EVA material with 40% VA content, melting point of 55°C, and melting index of 65g / 10min; the base layer is made of polystyrene Ethylene blended modified material, the preparation method is the same as in Example 1; the back adhesive layer is an EVA material with a VA content of 18% and a melt index of 3g / 10min. Wherein, the mass fraction of the hot melt adhesive layer is 35%, the mass fraction of the base layer is 55%, and the mass fraction of the back adhesive layer is 10%.

[0057] Using 3 screw extruders, add the hot melt adhesive layer, base layer and back adhesive layer into three screw extruders respectively for multi-layer co-extrusion, wherein the extrusion temperature of the hot melt adhesive layer is 90°C, and the matrix The extrusion temperature of the layer is 150°C, the extrusion temperature of the back adhesiv...

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Abstract

The invention relates to the technical field of hot-melt adhesive films, and provides a hot-melt sealing adhesive film and a preparation method thereof. In the invention, the hot-melt adhesive layer material and the matrix layer material are subjected to multi-layer co-extrusion to obtain a hot-melt sealing adhesive film. The invention utilizes a multi-layer co-extrusion method to prepare a hot-melt sealing adhesive film, which can realize one-step molding, and can greatly improve the bonding ability of the hot-melt adhesive layer and the base layer. Good effect and good storage. Further, the present invention adds a back adhesive layer on the back of the base layer, which can increase the back bonding strength of the hot melt adhesive film and improve the sealing effect. The present invention controls the extrusion temperature of multi-layer co-extrusion at medium and low temperature by controlling the material types of the hot-melt adhesive layer, the base layer and the back adhesive layer, thereby reducing the production temperature and the service temperature of the obtained hot-melt sealing adhesive film, and improving Adhesive strength, weather resistance and temperature resistance of the obtained hot melt sealant film.

Description

technical field [0001] The invention relates to the technical field of hot-melt adhesive films, in particular to a hot-melt sealing adhesive film and a preparation method thereof. Background technique [0002] The hot-melt adhesive sealing film is a film with a certain thickness made of meltable and adhesive materials. The sticky matter plays the role of bonding and sealing. [0003] The traditional hot-melt sealant film includes a base layer and a hot-melt adhesive layer arranged on the surface of the base layer. During production, the hot-melt adhesive is usually coated on the surface of the base layer by gluing. This method requires the preparation of the base layer, and then apply glue, it is impossible to realize the one-step forming of the hot melt sealing film, and the glue is prone to sticking during the glue application process, resulting in difficulty in coating and uneven glue, resulting in hot melt adhesive layer It has poor bonding ability with the base layer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/30B32B27/32B32B27/18B32B7/12B32B27/08B32B33/00B29D7/01
CPCB32B27/306B32B27/32B32B27/18B32B7/12B32B27/08B32B33/00B29D7/01B32B2581/00B32B2307/306B32B2307/552B32B2250/246
Inventor 刘群江仝永哲张美宁
Owner CIXI LANXING PLASTIC & RUBBER IND
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