Uv-crosslinked hot-melt pressure-sensitive adhesive used for polyvinyl-chloride insulated adhesive tape

Abstract

The present invention provides a UV-crosslinked hot-melt pressure-sensitive adhesive used for a polyvinyl chloride (PVC) insulation adhesive tape, made by mixing a polymer of vinyl monomers, functional monomers, special soft monomers, and photoinitiators with a tackifying resin and an antioxidant in certain proportions; the composition of the photoinitiator polymer contains a copolymer of one or more polymerizable photosensitive initiators and acrylate monomers, or a mixture of oligomers of one or more polymerizable photosensitive initiators and acrylate high polymers. The PVC adhesive tape made using such a pressure-sensitive adhesive has the advantages of excellent mechanical properties, bonding performance, and resistance to high temperatures, and is energy-saving and environmentally friendly; the present invention overcomes the defect of the prior art that a relatively long thermal oven is needed to volatilize a solvent in the glue when coating a PVC adhesive tape, which is applicable for wrapping and strapping cable bundles in different positions of the body of an automobile, can satisfy the requirement for uses on high temperature-resistant positions of an engine inside the automobile, and reaches a long-term temperature resistance level of 125° C.

1 . A UV-crosslinked hot-melt pressure-sensitive adhesive used for a PVC insulation adhesive tape, comprising the following major components: polymers containing vinyl monomers, functional monomers, soft monomers, and photoinitiators, a polymerization initiator, and an antioxidant. 
     
     
         2 . The UV-crosslinked hot-melt pressure-sensitive adhesive used for a PVC insulation adhesive tape according to  claim 1 , further comprising a copolymer of one or more polymerizable photosensitive initiators and acrylate monomers, or comprising a mixture of oligomers of one or more polymerizable photosensitive initiators and acrylate high polymers. 
     
     
         3 . The UV-crosslinked hot-melt pressure-sensitive adhesive used for a PVC insulation adhesive tape according to  claim 1 , wherein the vinyl monomer is selected from a group consisting of one or more n-butyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, isobornyl acrylate, n-dodecyl acrylate, methyl n-butyl acrylate, methyl 2-ethylhexyl acrylate, and methyl n-octyl acrylate, and the amount of the vinyl monomer is 40-65% of the total amount. 
     
     
         4 . The UV-crosslinked hot-melt pressure-sensitive adhesive used for a PVC insulation adhesive tape according to  claim 1 , wherein the functional monomer is a nitrogen-containing functional monomer, preferably N-vinylpyrrolidone, and the amount thereof is 2-10% of the total amount. 
     
     
         5 . The UV-crosslinked hot-melt pressure-sensitive adhesive used for a PVC insulation adhesive tape according to  claim 1 , wherein the soft monomer is C17 acrylate or methyl acrylate, and the amount of the vinyl monomer is 5-15% of the total amount. 
     
     
         6 . The UV-crosslinked hot-melt pressure-sensitive adhesive used for a PVC insulation adhesive tape according to  claim 1 , wherein the photoinitiator is methacryloyloxy or acryloyloxy containing acetophenone or benzophenone derivatives, and the amount of the vinyl monomer is 2-10% of the total amount. 
     
     
         7 . The UV-crosslinked hot-melt pressure-sensitive adhesive used for a PVC insulation adhesive tape according to  claim 1 , further comprising a tackifying resin, the tackifying resin comprising one or more selected from the group consisting of rosin resins, terpene resins, petroleum resins, and corresponding hydrogenated or esterified modified resins, and the amount of the tackifying resin being 2-20% of the total amount. 
     
     
         8 . The UV-crosslinked hot-melt pressure-sensitive adhesive used for a PVC insulation adhesive tape according to  claim 2 , wherein the polymerization initiator comprises azo compounds, acyl peroxides, and alkyl peroxides, the azo compound being 2,2-azobisisobutyronitrile, and the acyl peroxides being benzoyl peroxide, didecanoyl peroxide or isononanoyl peroxide, or the polymerization initiator is benzotriazole-1-yl-oxy-tris(dimethyl amino) phosphonium hexafluorophosphate, and the amount of the polymerization initiator is 1-10% of the total amount. 
     
     
         9 . The UV-crosslinked hot-melt pressure-sensitive adhesive used for a PVC insulation adhesive tape according to  claim 1 , wherein the antioxidant is an aromatic antioxidant, a hindered phenol antioxidant, or a secondary antioxidant, and the amount thereof is 0.5-1.5% of the total amount. 
     
     
         10 . The UV-crosslinked hot-melt pressure-sensitive adhesive used for a PVC insulation adhesive tape according to  claim 9 , wherein the antioxidant is dianiline, p-dianiline, antioxidant 1010, or antioxidant 1076.