Preparation method of high-quality breathable hot melt adhesive film

Abstract

The invention discloses a preparation method of a high-quality breathable hot melt adhesive film. The preparation method comprises steps as follows: BPO (benzoyl peroxide) and DCP (dicumyl peroxide) in a mass ratio being 3:(1-1.5) are dissolved by ethyl acetate with the concentration of 30%, and an initiator solution is prepared; an EAA (ethylene acrylic acid copolymer) and MAH (maleic anhydride) in a mass ratio being 100:(1.5-2) are uniformly stirred in a blender mixer, the initiator solution is added to the blender mixer and is uniformly stirred, and then a modified hot melt adhesive raw material is prepared through melt grafting granulation by means of a double-screw granulator with seven temperature regions; an antioxidant, a hyperdispersant and an anti-blocking agent are added to the modified hot melt adhesive raw material, and a mixture is placed in a kneading machine for mixing; the mixture is subjected to extrusion by a single-screw extruder and is processed by an embossing and piercing roller, a casting machine and an expander, and a product is prepared. The modified hot melt adhesive adopts the EAA with low AA content, the EAA-graft-MAH grafting ratio is enabled to be higher and the MAH residue quantity is enabled to be lower through initiator compounding, preparation of the fisheye-free hot melt adhesive film with high polarity and excellent heat resistance is facilitated; the heat resistance and the adhesion performance are balanced, and the preparation method has wider application prospect.

Description

technical field [0001] The invention relates to a hot-melt adhesive film, in particular to a preparation method of a high-quality hot-melt adhesive breathable film. Background technique [0002] At present, there are several different types of hot melt adhesive raw materials for olefin hot melt adhesive films widely used in the market: [0003] Ethylene vinyl acetate copolymers (EVA) with different vinyl acetate (VA) content; [0004] Ethylene acrylic acid copolymers (EAA) with different acrylic acid (AA) content; [0005] Polyethylene (PE) grafted maleic anhydride (MAH) copolymer (PE-graft-MAH); [0006] The hot-melt collagen materials of the above three systems all have advantages in specific fields of use, lack of universality and generality, and have their own shortcomings in the large-scale promotion and use of hot-melt adhesive films! [0007] EVA system: Although the high VA content ensures sufficient adhesion, the hot melt adhesive material of this structure has a...

AI Technical Summary

Problems solved by technology

What is more fatal to film users is that the material has poor stability and contains more gel particles, and the appearance of the film is extremely poor or even impossible to form a film.

In addition, when the grafted material of the HDPE system is used as a film, the transparency is very low

[0010] Processing method: Since the existing hot-melt adhesive EVA and EAA films mainly use the scraping process, release paper must be used as a support. For film products, the cost of the backing paper will account for 10%-40% of the cost. It not only increases the cost of customers, but also causes great waste, which is not conducive to environmental protection, and the product has poor air permeability and moisture permeability