Cov txheej txheem ua rau cov khoom siv polyurethane
Jun 03, 2023
Cov txheej txheem-rau-polyurethane-cov ntaub ntawv
Nyob rau hauv xyoo tas los no, kev txhim kho ntawm cov thev naus laus zis cuam tshuam rau kev hloov kho polyurethane tau dhau los ua qhov kev tshawb fawb hotspot. Lub hom phiaj yog ua kom cov hloov kho polyurethane muaj cov khoom siv zoo dua qub nrog rau kev ua kom sov, tshuaj tiv thaiv thiab lwm yam khoom, kom cov tshuab ua npuas dej tuaj yeem siv dav hauv kev tsim khoom ntawm tsheb.
Polyurethane tau tsim thawj zaug los ntawm German chemist Otto Bayer thiab nws cov npoj yaig hauv xyoo 1936 thaum kawm txog cov txheej txheem polymerization ntxiv ntawm isocyanates. Peb qhov kev lag luam loj hauv lub xyoo pua 20th tau txhawb txoj kev loj hlob sai ntawm kev tsim khoom ntawm polyurethane. Cov khoom siv polyurethane tuaj yeem siv dav hauv ntau yam xws li kev lag luam teeb, kev lag luam petrochemical, kev lag luam electromechanical, kev lag luam tsheb, kev lag luam hluav taws xob, kev lag luam tub rog thiab kev tsim kho kev lag luam.
Cov txheej txheem ua rau cov ntaub ntawv polyurethane
RIM polyurethane feem ntau yog hais txog RIM, RRIM (Reinforced Reaction Injection Molding), SRIM, MC-RIM, GRIM thiab RIRIM (Rotary Txhaj RIM).
RIM hais txog cov txheej txheem ntawm cov khoom siv uas tsis muaj zog; RRIM feem ntau yog hais txog cov ntaub ntawv lossis cov txheej txheem npaj los ntawm kev cuam tshuam cov fibers luv luv lossis lwm yam khoom siv ntxiv nrog cov khoom siv tshuaj tiv thaiv; SRIM yog hais txog cov fibers ntev ntev uas tau muab tso rau hauv cov kab noj hniav thiab tom qab ntawd txhaj rau hauv kab noj hniav los ntawm cov ntaub qhwv fiber ntau. Cov khoom siv lossis cov txheej txheem uas cuam tshuam tom qab dhau mus; MC-RIM yog hais txog ntau cov tshuaj tiv thaiv kev txhaj tshuaj molding, tseem hu ua "multi-stage txhaj RIM", uas yog, cov khoom siv rau ntawm daim tawv nqaij thiab hauv nruab nrab qhov chaw raug txhaj rau hauv kab noj hniav txuas ntxiv mus; GRIM yog hais txog nyias-walled thiab hollow qhov chaw. Cov txheej txheem no tuaj yeem txuag tau li 40 feem pua ntawm cov khoom siv raw; RIRM yog hu ua rotary reaction injection molding. Cov yam ntxwv ntawm cov cuab yeej no yog tias tsis muaj kev txwv ntawm viscosity ntawm cov khoom. Muaj ob txoj kev txhaj tshuaj: ib qho yog kev txhaj tshuaj sib xyaw nrog lub qhov me me ua qhov chaw txhaj tshuaj, thiab lwm qhov yog lub dav hlau teb dav hlau sib xyaw nrog qhov sib txawv raws li qhov chaw txhaj tshuaj.