Preparation Of Polyether Polyurethane Adhesive And Its Structure And Property

In this paper, polypropylene glycol (PPG2000,PPG600),polyethylene glycol(PEG1000,PEG400)were used as the main polyether diol, toluene diisocyanate isophorone and diisocyanate were used as the main diisocyanate ,and isophorone diamine,1,4-BD were used as the main chain extender to synthesize ethanol-soluble polyurethane with different material in the solvent that mixed by isopropanol and ethyl acetate.Adjusted the hard segment content by mixing polyether diol, changing the amount of diisocynate and chain extender. The chemical structure of PU and PUU were studied by FTIR, the degree of hydrogen bonding of PU and PUU were studied by computer peak fitting,the adhesive property of PU and PUU to different material were studied by test of T peel strength.1.When used mixed polyether diol PPG600/PPG2000, the degree of disordered hydrogen bonding of urethane carbonyl groups increased with increasing of PPG600 conten,the amount of ordered hydrogen bonding urethane carbonyl groups increased.There is a better compatibility between soft segment and hard segment. When used mixed polyeter diol PEG400 /PPG2000, the amount of ordered hydrogen bonding urea carbonyl groups increased ,but then the degree of ordered hydrogen bonding for urea carbonyl groups decreased and the degree of disordered hydrogen bonding increased with the increase of PEG400 content . The change in degree of hydrogen bonding for urethane carbonyl groups was not evident.2.When the amount of diisocyanate and chain extender was increased ,PU was tend to has long hard segment.The degree of ordered hydrogen bonding and disordered hydrogen bonding were both increased, separation of hard segment and soft segment was increased.3.Study on the adhesion of PU with PET, Nylon, BOPP. PUU which had urea carbonyl had greater peel strength(PET, Nylon) than PU.PU that synthesized with IPDI,1,4-BD had good peel strength to BOPP.