Tus neeg sawv cev qhia txheej

Ua ntej, qhov kev qhia ntawm tus neeg saib xyuas txheej

Nws muaj ntau txoj hau kev rau kev siv roj hmab. Raws li cov qauv tshuaj, muaj cov:

1. Polyacrylates (PA); 2. Polyurethanes (PU); 3. Polyvinyl chlorides (PVC); 4. Silicones; 5. Khoom siv hluavtaws (xws li polychloroprene).

Tsis tas li ntawd, kuj muaj polytetrafluoroethylene, polyamide, polyester, polyethylene, polypropylene thiab proteins. Tam sim no, cov ntaub ntawv tseem ceeb yog polyacrylates thiab polyurethanes.

Raws li qhov nruab nrab siv hauv kev siv, nws muab faib ua ob hom: hnyav hom thiab dej hom.

Cov roj-raws li txheej gel yog npaj los ntawm dissolving acrylic acid los yog polyurethane hauv cov roj (toluene, DMF, methyl ethyl ketone, thiab lwm yam) raws li qhov hnyav. Qhov kom zoo dua yog qhov uas ua rau cov cuab yeej zoo nkauj, qhov ceev nrooj zoo, thiab PU tuaj yeem txuas nrog cov cua kub kua nplaum, uas yog txheej nplaum uas feem ntau siv tam sim no. Qhov tsis zoo yog vim tias siv cov roj oily, muaj kev tiv thaiv ib puag ncig, tshwj xeeb yog tam sim no hais tias roj nqi muaj risen, uas ua rau cov tshuaj ua kom muaj roj ntau tuaj. Feem ntau ntawm cov txheej nplaum siv ntau cov oily cov kuab tshuaj vim cov nqi siab. Kev tiv thaiv txog kev tiv thaiv tsis yog mus txog rau tus qauv, thiab nrog kev txhim kho ntxiv ntawm ib puag ncig cov qauv hauv ntau lub teb chaws, kev tiv thaiv ib puag ncig rau cov roj hmab coated tau siab dua thiab siab dua.

Dej raws txheej txheem yog tau los ntawm emulsification ntawm acrylic los yog polyurethane resin los ntawm kev tshwj xeeb emulsification khoom siv dej ua hnyav. Nws qhov zoo tshaj plaws yog: ntau yam, thaj chaw tiv thaiv, tsis muaj nqi, ntau coatings yog tam sim no ua los ntawm dej-soluble kua nplaum, xws li: dej-soluble PA, dej-soluble PU thiab zaj duab xis lo nplaum, oily waxy, scratching paste Thiab lwm cov kev ua pa . Dej solubility yog kev coj ntawm txheej tom ntej vim nws cov functionality, environmental friendliness thiab tus nqi tsawg. Cov kev tsis zoo yog cov neeg pluag tsis zoo, cov neeg txom nyem tsis huv, thiab PU tuaj yeem tsis txuas rau cov cua kub cua txias.

Raws li txheej txheem thiab ci tej yam mob, muaj txheej txheem lo thiab txheej ntub txheej, tsis tshua muaj kev sib dhos sib txuas ntawm cov kua nplaum thiab qhov kub siab sib txuas ntawm cov nplais. Cov coatings qhuav thiab tsis tshua muaj siab kub yog cov qauv ntawm cov coated fabrics rau yav tom ntej vim tias lawv txoj kev txheej txheem yooj yim, tsis tshua muaj siab ci thiab txuag hluav taws xob.

Polyacrylate txheej nplaum (Polyacrylate hu ua PA) acrylic

Kev ua tau zoo: hnub ci thiab huab cua zoo, tsis yoojyim rau daj; zoo transparency thiab compatibility, zoo rau kev tsim cov khoom siv xim dawb; zoo ntxuav; muaj zog adhesion; txo nqi. Quav elasticity, yooj yim wrinkle; txom nyem nto tiav; nyuaj hloov kho.

Polyurethane txheej nplaum (Polyurethane raug xa mus ua PU)

Polyurethane yog ib lub tshuab polyurethane thiab yog ib lub tshuab muaj polymer uas muaj ib -NHCOO chav nyob hauv ib lub qauv molecular. Chav tsev yog tsim los ntawm reacting lub isocyanate pawg nrog ib pab pawg neeg hydroxyl. Polyurethane coatings yog lub ntsiab ntawm txoj kev loj hlob hnub no, thiab lawv qhov zoo yog:

Qhov txheej yog mos thiab ywj; qhov txheej txheem muaj zog thiab siv tau rau cov tho txheej heev; qhov txheej yog qhov ntxeem tau, muaj kev ruaj nphauv thiab chaw sib kis zoo; txhav tsis kam, noo noo thiab qhuav tu tsis ua hauj lwm.

Qhov tsis zoo yog tias:

Them siab; huab cua phem tsis kam; hydrolysis nyob rau hauv dej, tshav kub thiab alkali.

PU txheej neeg ua hauj lwm xaib

Tus PU lo tus neeg sawv cev yog muab tso rau hauv lub polyester polyurethane, ib hom polyurethane, polyurethane muaj ntxhiab, thiab ib qho aliphatic isocyanate hom polyurethane.

Raws li qhov nruab nrab siv hauv kev siv, nws muab faib ua feem xyaw thiab dej.

Xuas tes ua kua PU txheej nplaum

Pv-based-based PU muaj lub zog tensile zoo thiab dej tsis kam, tab sis yog cov co toxic heev thiab yooj yim rau kev hlawv. Nyob rau hauv cov nqe lus ntawm Cheebtsam, nws tseem raug muab faib ua ob-pab pawg thiab kev faib tawm ib leeg. Ob qhov khoom tiv thaiv ua ke muaj ib lub prepolymer thiab tus neeg sawv cev ntawm tus ntoo khaub lig, uas yog tus prepolymer hydroxyl-terminated ua los ntawm reacting lub isocyanate nrog ib tug oligomeric polyol. Tus neeg saib xyuas kev sib tw no yog ib qho uas muaj ntau tshaj (lossis ntau dua) ntawm pawg (yog peb lossis tshaj saud). Feem ntau cov tshuaj hnyav PU txheej gels siv DMF, los yog toluene thiab isopropanol sib xyaw kom hnyav. Yuav kom ua tiav cov dej ua tsis zoo thiab cov dej noo noo, cov tshuaj ua dej tshuaj xo txheej feem ntau txheej txheem ntawm cov ntaub ntub los ntawm txheej txheej txheej.

Dej raws li PU txheej nplaum

Cov dej system faib rau ob hom: dej-soluble thiab dej-dispersible. PU-water based PU yog siv rau ntaub txheej txheej, muaj ib qho loj ntawm nto, thiab muaj dej tsis zoo. Cov dej haus PU coatings feem ntau yog siv hauv qhuav coatings. Txhawm rau txhawm rau txhim kho cov dej tsis zoo, softness thiab durability ntawm coated cov khoom, rau pem hauv ntej thiab qab waterproofing yuav tsum tau nqa tawm.

Los ntawm txoj kev xav ntawm waterproof txheej, PVC yog dej tsis ruaj, tab sis nws yuav nyuaj thiab brittle nyob rau lub caij ntuj no, yooj yim tsim creases los yog lov, thiab qhov nyhav loj dua PU txheej. PU txheej tsis tsuas yog ua kom muaj qhov tsis xws luag ntawm PU, tab sis kuj yog dej tsis sib haum. Lub silicone txheej yog PU, tab sis nws muaj peev xwm zoo dua qub thiab muaj peev xwm ua tiav ntau yam PU coatings nrog ib daim ntaub me me.