I-polyurethane varnish - izinto ezigqibeleleyo zokugqibela

Ukuphuhliswa kobuchwepheshe bezobugcisa bezolimo ukwenzela ukuveliswa kwezixhobo zokugqiba kwenza kube lula ukuvelisa zonke iimveliso ezintsha kunye neenombolo ezizodwa. Ezi zintle ziquka i-polyurethane varnish.

Le ngongoma yindlela ehlukileyo yokwenza isisombululo se-hydroxyl ene-polyfunctional isocyanates. I-polyurethane varnish xa isetyenziswe kuyo yakha i-polymeric eqinile phezu komhlaba kunye nesakhiwo sesithathu. Le nkqubo ibangelwa ukuphendulwa kwe-isocyanates kunye neengxenye ze-hydroxyl (iipolyester ezingaphelelanga ezifunyenwe yindlela eyenziwa ngayo ngokugqithiseleyo kotywala nge-dibasic acid okanye kunye nexube ye-monobasic ne-dibasic fatty acids).

Ngokuqhelekileyo zisetyenzisiwe kwaye zincinci i-polyvinyl acetate, i-polyacetals ezingaphelele, i-ethers ye-cellulose, i-phenol formaldehyde kunye ne-xylene-formaldehyde resins. Phakathi kwama-isocyanates asetyenziswa kakhulu amaninzi asetyenziswa i-toluene diisocyanate kunye nemidixo yayo eyahlukahlukeneyo. I-hexethylene diisocyanate kunye nemveliso ye-toluene diisocyanate kunye ne- polyhydric alcohol kunye ne-polyester ene-hydroxyl isetyenziswa kwakhona. Ukusebenza kwezi zinto kudinga ukuqapha okukhethekileyo. Yingakho kusebenza ngakumbi ukusebenzisa "i-isocyanate" okanye "ifihliweyo" eyaziwayo, eziyi-compounds ezonakalisa lula xa zishushu. Eli qela liquka iimveliso zokusabela ze-isocyanate kunye ne-malonate, i-acetoacetic ether, i-ethyleneimine kunye ne-phenylurethane. I-polyurethane i-varnishes iyachithwa ngama- esters, i- ketoni, i-hydrocarbons chlorinated, i-nitroparaffin. I-diluent yala ma-agent is xylene, i-toluene, i-hydrocarbon i-aliphatic.

I-Polyurethane i-varnishes ifumaneka ngesimo sequmrhu elilodwa okanye izakhiwo ezimbini. Kwimeko yesibini, isisombululo esilungiselelwe ngokwahlukileyo samakhemikhali e-hydroxyl okanye i mixube zala maqumrhu kunye nezixazululo ze-isocyanate ziyaxutywa ngaphambi kokusetyenziswa kwe-arhente. Uluhlu olunjalo olulungiselelweyo lwe-lacquer lugcinwa ngeeyure ezingama-4 ukuya kuma-48. Ezi zivalo zisetyenziselwa ukutshisa nokutshisa. Elinye iqela elishushu eliphilisa iilcquers ezenziwe ngesiseko sezinto ezibizwa ngokuba "zivaliwe" i-isocyanate zibhekwa njengezinzile ngokungenamkhawulo.

I-polyurethane i-verarnish ifom i-glossy, i-elastic coatings kunye nobunzima obuphezulu, ukubambelela kakuhle, izakhiwo eziphezulu zeeleyiti kunye nokuchasana kwamakhemikhali. Ziye zisetyenziswe ngokubanzi ukukhusela ikhonkrithi, izitye, izakhiwo zokhuni kwaye zisetyenziselwa ukupakisha izixhobo zamakhemikhali, i-metallurgical kunye neoli, kwiindawo zokutya.

I-polyurethane i- pararnet yeparquet, ifenitshala, ierubha, iphepha, isikhumba, izakhiwo zeenqanawa, izambatho zokwenziwa kunye neeplastiki ziveliswa. Le ngxibo ihlala ihlala ihlala ihlala kwaye iyenzeka, iyakwandisa ngokukhawuleza impilo yobomi bezinto ezahlukeneyo. I-component-varnishes enye isetyenziswa rhoqo ukukhusela ithusi, i-aluminium kunye nemveliso yensimbi.

I-Lacquer i-polyurethane yamanzi ikhusela iindonga zeenkuni kunye nezilwanyana ezivela kwiifungi kunye nesikhunta. Ukukhanya okukhawulezileyo nokukhuseleka kobushushu. Ingubo evulekileyo ikuvumela ukuba ugxininise ngokugqithiseleyo ubuhle bemvelo bokhuni.