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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: 2020-12-01
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 preparation method of 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 multi-layered co-extruded to obtain a hot-melt sealant film; the hot-melt sealant film includes a base layer and a hot-melt sealant respectively disposed on both sides of the base layer. Adhesive layer and backside 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 23-52 wt%, More preferably, it is an EVA material with a VA content of 30-50wt%; the melting point of the first copolymer is preferably 45-72°C, more preferably 50-70°C, and the melting index is preferably 18-180g / 10min, more preferably 25 to 150 g / 10min, more preferably 50 to 80 g / 10min. In the present invention,...

Embodiment 1

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

[0054] Using three screw extruders, the hot-melt adhesive layer, the matrix layer and the back adhesive layer were respectively added to the three screw extruders for multi-layer co-ex...

Embodiment 2

[0056] 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 40%, a melting point of 55°C and a melt index of 65g / 10min; the base layer is made of EVA material. The preparation method of the ethylene-blended modified material is the same as that of 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 backside adhesive layer is 10%.

[0057] Using three screw extruders, the hot-melt adhesive layer, the base layer and the back adhesive layer were respectively added to the three screw extruders for multi-layer co-extrusion. The extrusion temperature of the hot-melt adhesive layer was 90 °C, and the The extrusion temperature of the layer was 150°C, the extrusion temperature ...

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Abstract

The invention relates to the technical field of hot-melt sealant films, and provides a hot-melt sealant film and a preparation method thereof. A hot-melt sealant material and a matrix layer material are subjected to multi-layer co-extrusion to obtain the hot-melt sealant film. The hot-melt sealant film is prepared by using a multi-layer co-extrusion method, one-step molding can be realized, the bonding capacity of the hot-melt sealant layer and the matrix layer can be greatly improved, and the obtained hot-melt sealant film is not easy to degum, uniform in sealant, good in sealing effect and good in storability. Furthermore, a back bonding layer is additionally arranged on the back surface of a matrix layer, so the back bonding strength of the hot-melt sealant film can be improved, and sealing effect is improved. By controlling the material types of the hot-melt sealant layer, the matrix layer and the back bonding layer, the extrusion temperature of multi-layer co-extrusion is controlled at medium and low temperatures, production temperature and the use temperature of the obtained hot-melt sealant film are reduced, and the bonding strength, weather resistance and temperature resistance of the obtained hot-melt sealant film are improved.

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 cohesive materials. The sticky material acts as an adhesive seal. [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 first. layer, and then gluing, it is impossible to realize the one-step forming of the hot-melt sealing film, and the glue is prone to bonding during the gluing process, which makes coating difficult, and the phenomenon of uneven glue is prone to occur, resulting in the hot-melt adhesive layer. It has poor bonding abil...

Claims

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Application Information

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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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