The invention discloses a
thermoplastic solvent-free two-component
polyurethane adhesive and a preparation method thereof. The
thermoplastic solvent-free two-component
polyurethane adhesive comprises
polyol, diisocyanate, a catalyst and a chain
extender, wherein the diisocyanate is prepared from one or more of
diphenylmethane diisocyanate,
isophorone diisocyanate, 2, 4-
toluene diisocyanate, 2, 6-
toluene diisocyanate and
hexamethylene diisocyanate, and the diisocyanate is prepared from one or more of
diphenylmethane diisocyanate,
isophorone diisocyanate, 2, 4-
toluene diisocyanate, 2, 6-
toluene diisocyanate and
hexamethylene diisocyanate; a catalyst includes; the chain
extender comprises one or more of 1, 2-
propylene glycol, 1, 2-hexanediol, 1, 2-pentanediol, 1, 3-
propylene glycol, 1, 6-hexanediol and 1, 10-decanediol; the chain
extender comprises one or more of 1, 2-
propylene glycol, 1, 2-hexanediol, 1, 2-pentanediol, 1, 3-propylene glycol, 1, 6-hexanediol and 1, 10-decanediol; the
polyurethane elastomer is prepared from the following components in parts by weight: 40 to 50 parts of
polyol, 35 to 40 parts of diisocyanate, 0.005 part of a catalyst and 10 to 20 parts of a chain extender. The
polyurethane adhesive prepared by the invention is convenient to melt and disassemble when devices are recycled.