Composite hot-melt adhesive net film and manufacturing process thereof

A preparation process of a composite hot melt adhesive mesh film, comprising the following steps:

• 1) providing a polyamide hot melt adhesive and a polyolefin hot melt adhesive as raw materials to produce the composite hot melt adhesive, wherein the polyamide hot melt adhesive has a differential scanning calorimetry final melting point of 116° C. to 130° C. and a melt flow rate of 30 g/10 min/160° C. to 50 g/10 min/160° C. and the polyolefin hot melt adhesive comprises the following components in mass by percentage taking the total of the following components as 100%:
• 8% to 15% of compatibilizer, 50% to 70% of polyethylene, 3% to 10% of other polyolefin, 0.2% to 0.8% of initiator, 0.7% to 1.3% of silane coupling agent, 8% to 20% of tackifier, 1.0% to 10% of inorganic filler and 0.4% to 0.8% of antioxidant,
• wherein the compatibilizer is maleic anhydride grafted low density polyethylene and the silane coupling agent is vinyltrioxysilane or γ-aminopropyltrimethoxysilane;
• 2) melting and pumping the polyamide hot melt adhesive and the polyolefin hot melt adhesive into a first spinneret and a second spinneret that are independent from each other respectively;
• 3) spraying the polyamide hot melt adhesive onto a conveyor belt at a first preset speed through the first spinneret under drafting of a first air flow, and then heating the polyamide hot melt adhesive through a first infrared heating zone;
• 4) spraying the polyolefin hot melt adhesive onto the polyamide hot melt adhesive-containing conveyor belt from step 3) at a second preset speed through the second spinneret under drafting of a second air flow, stacking the polyolefin hot melt adhesive with the polyamide hot melt adhesive while the polyamide hot melt adhesive is hot, and then heating the stacked the polyolefin hot melt adhesive and the polyamide hot melt adhesive through a second infrared heating zone, so as to form a stacked polyolefin hot melt adhesive and polyamide hot melt adhesive;
• and
• 5) cooling, crystallizing, curing and rolling up the stacked polyolefin hot melt adhesive and polyamide hot melt adhesive to form the composite hot melt adhesive.