High-barrier polyolefin composite film
A polyolefin, high-barrier technology, used in polyurea/polyurethane adhesives, non-polymer adhesive additives, adhesive types, etc., can solve the problem of long drying tunnel, poor heat resistance, and no barrier properties. and other problems, to achieve the effect of overcoming technical defects, reducing packaging costs, and excellent barrier performance.
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[0035] The present invention also provides a preparation method of polyurethane adhesive, which comprises the following steps:
[0036] 1) Add diphenylmethane diisocyanate, polytetrahydrofurandiol, epoxy resin, castor oil, styrene, dibenzoyl peroxide and additives into a stirred tank and heat and stir evenly;
[0037] 2) Continue to add filler and curing agent, heat and stir evenly to obtain polyurethane adhesive.
[0038] Then, the polyurethane adhesive is roll-coated between the layers (between the printed decoration layer 2 and the sheet-shaped inorganic silica PVA coating 4), and the polyurethane adhesive layer 3 is obtained after drying.
Example Embodiment
[0040] Example 1
[0041] Polyurethane adhesive includes the following parts by weight:
[0042]
[0043] Among them, the polyurethane adhesive also includes 15 parts by weight of closed-form 1,2-carbodidecaborane. The filler is a mixture of nano zinc oxide powder, nano calcium carbonate powder and nano alumina powder. Additives also include stabilizers and coupling agents.
Example Embodiment
[0044] Example 2
[0045] Polyurethane adhesive includes the following parts by weight:
[0046]
[0047] Among them, the polyurethane adhesive also includes 18 parts by weight of closed-1,2-dicarbonate dodecaborane. The filler is a mixture of nano zinc oxide powder, nano calcium carbonate powder and nano alumina powder. Additives also include stabilizers and coupling agents.
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