CREATED impact-resistant POLIURETHAN
At the Institute of Problems of Chemical Physics RAS a shock-resistant polyurethane blocked diisocyanate and its method of preparation. New polymer is 5-8 times more strongly resists impact load than existing counterparts polymers, and the glass transition temperature polymer compositions obtained by the new technology does not exceed 30-70 | C.
It is well known that polyurethane coatings, adhesives and film materials often prepared using isocyanates blocked caprolactam. As a second component polyurethane compositions generally used various compounds having active hydrogen atoms, epoxy resins or amine adducts thereof.
However, existing compositions can only be used as coatings, and with organic solvents in the preparation of compositions and formed into a coating. Such compositions can not be practically processed in the unit without the use of solvents because of high reactivity and high composition viscosity at moderate temperatures (around 100 | C). In addition, to obtain high quality thick block products of compositions based on blocked di-or polyisocyanates by the free-casting is difficult also because of gas formation due to the presence of blocked polyisocyanates and residual solvent unblocked isocyanate groups, as well as traces of moisture in the composition.
But the Institute of Problems of Chemical Physics, Russian Academy of Sciences were able to develop a new impact-resistant polyurethane based on blocked polyisocyanates that can be processed by the free-casting without the use of solvents.
Success has been achieved thanks to the fact that the polyurethane was made on the basis of an adduct of bisphenol A diglycidyl ether with hydroxyl-containing monoamine, Î-caprolactam blocked diisocyanate at a certain molar ratio [OH] to [NCO]. In addition, as the polyurethane contains hydroxyl monoamine methylethanolamine, and as a diisocyanate - 4,4 #39;-diisocyanatodicyclohexylmethane.
The new polymer composition has an energy of ductile fracture is 5-8 times greater than that of the existing analogue ehpoksiaminnyh composite systems. A glass transition temperature of the polymer compositions obtained by the new technology does not exceed 30-70 | C.
Contact information:
142432, Moscow region., Noginsk, Chernogolovka, Institutsky, etc., 18, IPCP, B.A.Komarovu
