Txhua tus neeg yuav tsum paub cov lus "PU txheej", yog li dab tsi yog PU? Cov khoom siv twg yog nws tsim los ntawm? Nws yog coated li cas? Hauv qab no, kuv yuav qhia luv luv txog qee qhov kev paub hauv cheeb tsam no los tham nrog koj, vam tias yuav pab koj kom nkag siab qee qhov kev nkag siab ntawm lub tswv yim ntawm PU txheej.

PU tiag tiag yog polyurethane. Nws qhov kev ua tau zoo yog qhov tshwj xeeb los ntawm kev hnav tsis kam, hnyav tsis kam thiab kub tsis kam (hauv qab 30 degree), zoo waterproof thiab ya raws permeability, cua tsis kam thiab softness. Feem ntau, nws yog milky dawb emulsion. Cov ntaub ntawv xws li cov ntaub thiab cov ntaub tsis-woven tuaj yeem muab tso rau hauv ntau yam ntaub los yog hauv ob sab phlu, thiab tuaj yeem ua tiav thiab sib xyaw nrog ntau tshaj ob lossis peb txheej ntawm cov yeeb yaj kiab uas muaj ntau yam ntxwv. Peb feem ntau tuaj rau hauv kev sib cuag nrog nyias-coated PU khoom, uas yog tsuas yog siv rau PU txheej ntawm sab nraum zoov khaub ncaws thiab hnab ntaub. Piv txwv li, cov khoom xws li imitation tawv (xws li tawv tawv), txhuam suede thiab lwm yam khoom kuj yog PU txheej khoom. Polyurethane PU txheej tuaj yeem tsim tau ntau yam khoom siv ntau yam khoom muaj nqis ntxiv, uas yog siv dav hauv khaub ncaws, kho kom zoo nkauj, tub rog thiab lwm yam lag luam.

PU txheej txheej txheej tau muab faib ua nws daim ntawv txheej, uas tuaj yeem muab faib ua cov dej-raws li thiab hnyav-raws li polyurethane. Solvent-raws li zaj duab xis-forming zog yog zoo, muaj zog adhesion rau fabrics, dej siab tsis kam, ntau haum rau waterproof thiab ya raws-permeable txheej. Txawm li cas los xij, hom hnyav muaj qee yam toxicity thiab flammability, thiab tsis yog ib puag ncig tus phooj ywg.

PU txheej tus neeg sawv cev yog ib qho thaiv polymer tsim los ntawm cov ntu mos thiab ntu tawv rov ua dua. Cov ntu mos ua rau PU mos thiab elastic. Nws yog tsim los ntawm polyether lossis polyester diol. Qhov loj ntawm nws qhov hnyav molecular kuj tuaj yeem cuam tshuam qhov softness thiab hardness ntawm PU. Cov ntu nyuaj ua rau PU muaj zog thiab elastic modulus. Nws yog tsim los ntawm ntau yam diisocyanates thiab saw extender. Qhov piv ntawm ob thiab cov qauv ntawm cov khoom siv raw tuaj yeem txiav txim siab thiab cuam tshuam rau kev ua haujlwm ntawm cov khoom.

Cov txheej txheem synthesis feem ntau yog ua los ntawm diisocyanate, polyester diol lossis polyether diol ntxiv rau cov saw txuas ntxiv thiab catalyst los ntawm kev daws teeb meem polymerization lossis bulk polymerization. Feem ntau granular los yog hmoov cov ntaub ntawv tuaj yeem tsim los ntawm bulk polymerization. Hom dej-emulsion tuaj yeem ua los ntawm emulsifier lossis tus kheej emulsion los ntawm kev qhia cov pab pawg hydrophilic. Cov kuab tshuaj yog ua los ntawm cov kuab tshuaj sib txawv raws li xav tau.

Cov txheej txheem txheej txheem suav nrog txoj kev qhuav, txoj kev ntub dej, txoj kev kub yaj, txoj kev hloov mus, txoj kev sib txuas, thiab lwm yam. Ntawm lawv, txoj kev qhuav yog siv ntau tshaj plaws. Txoj kev qhuav yog kom uniformly txheej txheej slurry ntawm lub hauv paus daim ntaub nrog ib tug coater. , Tom qab cua sov kom volatilize cov kuab tshuaj los yog dej, cov txheej ua ib zaj duab xis rau saum npoo ntawm cov ntaub. PU nyias txheej yog cov khoom siv qib siab hauv cov txheej txheem qhuav, feem ntau yog siv rau cov khaub ncaws fabrics.

Muaj ntau yam ntxwv thiab hom polyurethane PU txheej cov ntaub ntawv. Raws li rau lwm yam khoom thiab kev siv, peb yuav tsis qhia lawv ib tug los ntawm ib tug ntawm no.

Tsis tas li ntawd, cia kuv hais tias kuv tau siv cov yeeb yaj kiab polytetrafluoroethylene (PTFE) uas kuv tau kawm kwv yees tom qab ua haujlwm thaum kuv tshawb fawb tsis ntev los no hauv lub tuam txhab loj PU txheej khoom. Raws li kev taw qhia ntawm cov neeg ua haujlwm cuam tshuam, qee qhov (PTFE) cov yeeb yaj kiab kuj tau coated thiab npog nrog ib txheej ntawm polyurethane (PU) zaj duab xis los ua cov yeeb yaj kiab tsis muaj dej thiab ua pa.

Cov zaj duab xis sib xyaw ntawm polyurethane thiab PTFE zaj duab xis yog tsim los ntawm txoj kev qhuav. Siv cov kuab tshuaj sib xyaw, PU tuaj yeem ua tau zoo rau ntawm cov khoom siv PTFE. Cov nplaum polyurethane yog siv rau PTFE zaj duab xis siv cov txheej txheem kho hniav.

Cov dej noo permeability ntawm cov yeeb yaj kiab sib xyaw no txo ​​qis nrog qhov nce ntawm cov yeeb yaj kiab tuab, thiab rov ua dua. Lub polyurethane siv nyob rau hauv cov zaj duab xis composite yog ib tug thermoplastic nplaum. Tom qab cov zaj duab xis sib xyaw ua ke rau cov ntaub los ntawm thermocompression, cov ntaub ntawv tsis muaj dej tsis zoo nrog cov dej zoo tuaj yeem tau txais.