Polyurethane varnish - kan igbalode finishing ohun elo ti

Awọn idagbasoke ti igbalode imo ero fun isejade ti finishing ohun elo laaye lati gbe awọn gbogbo awọn titun ati ki o titun awọn ọja pẹlu nọmba kan ti oto-ini. Iru novelties kan polyurethane lacquer.

Eleyi awọn ohun elo ti o duro kan ti o yatọ tiwqn solusan ti hydroxyl polyfunctional isocyanates. Polyurethane lacquer nigba ti loo fọọmu lori dada ti a ri to polima pẹlu onisẹpo mẹta be. Ilana yi waye nitori awọn lenu ti isocyanates pẹlu hydroxyl irinše (pe polyesters gba nipa awọn lenu ti ohun excess ti polyhydric oti pẹlu kan dibasic acid tabi pẹlu apapo ti awọn monobasic ati dibasic ọra acids).

Igba ti a lo ati ki o fi aye die sile hydrolyzed polyvinyl acetates, pe polyacetals, cellulose esters, ati phenol-formaldehyde resini ksilolformaldegidnye. Lara awọn isocyanates lo julọ commonly lo diisocyanate ati orisirisi apapo rẹ. Bakannaa, lo hexamethylene diisocyanate ati awọn lenu awọn ọja ti excess diisocyanate pẹlu a polyhydric oti ati hydroxyl ti o ni awọn polyesters. Nṣiṣẹ pẹlu awọn ohun elo beere pataki ona. O ti wa ni Nitorina siwaju sii to wulo lati lo "dina" tabi "farasin" isocyanates, agbo eyi ti wa ni rọọrun decomposed nigbati kikan. Egbe yi pẹlu awọn lenu awọn ọja ti isocyanates pẹlu malonic, acetoacetic ester, ethyleneimine ati feniluretanom. Polyurethane lacquers ni tituka lilo esters, ketones, chlorinated hydrocarbons, nitroparaffins. Wọnyi irinṣẹ diluent ni xylene, toluene, aliphatic hydrocarbon.

Polyurethane lacquers wa o si wa bi ọkan-paati tabi meji-paati akopo. Ni awọn keji irú lọtọ pese ojutu ti hydroxyl-ti o ni agbo, tabi apapo ti awọn wọnyi orisirisi agbo ogun ati isocyanate solusan ṣaaju ki o to lilo yi oluranlowo ti wa ni adalu. Iru a gbaradi meji-paati lacquer ti wa ni pa lati 4 to 48 wakati. Iru epo wa ni lilo fun ti a bo ti gbona ati ki o tutu curing. Unlimited kà idurosinsin ọkan-paati gbona-curing epo ṣe lori ilana ti ki-a npe ni "dina" isocyanates.

Polyurethane varnish fọọmu kan didan, rirọ epo pẹlu ga líle, ti o dara gulu, ga aisi-itanna-ini ati kemikali resistance. Wọn ti wa ni increasingly ni lilo fun aabo ti nja, irin, onigi roboto sii ati ti lo fun kikun awọn ẹrọ ti kemikali, smelting ati refining eweko, lori ounje katakara.

Wa polyurethane varnish fun parquet, aga, roba, iwe, alawọ, ọkọ constructions, sintetiki aso ati pilasitik. Eleyi ti a bo jẹ gidigidi ti o tọ ati ki o wulo, o gidigidi mu ki awọn selifu aye ti o yatọ si ohun elo. Ọkan-paati epo ti wa ni igba ti a lo fun aabo ti bàbà, aluminiomu ati irin awọn ọja.

Varnish polyurethane omi aabo fun awọn onigi Odi ati orule ti m ati imuwodu. O ti wa ni oyimbo ina ati ooru-sooro. Yi sihin bo gba daradara saami awọn adayeba ẹwa ti igi.