Mahydrofluoroolefins (HFOs) akabuda sechinhu chakakosha mukugadzirwa kwemafuro epolyurethane anochengetedza kupisa, zvakanyanya nekuda kwekudzikira kwawo kwekupisa kwepasi rose (GWP) zvichienzaniswa nema blowing agents echinyakare akadai se hydrofluorocarbons (HFCs) uye hydrochlorofluorocarbons (HCFCs). Mumasystem aya, kugadzikana uye kushanda kwema polyurethane catalysts kwakakosha pakuzadzisa hunhu hwefuro hunodiwa. Pakati pema catalysts anoshandiswa mumasystems akavakirwa paHFO, DMDEE (Dimethylethanolamine) inoonekwa seyakanaka nekuda kwekuenderana kwayo uye kugadzikana kwayo.
Kusimbisa HFO-Based Systems
MaHFO ari kufarirwa zvakanyanya muindasitiri iyi nekuda kwekubatsira kwawo nharaunda uye kushanda zvakanaka mukudzivirira furo. Zvisinei, kuunzwa kweHFO mumasisitimu epolyurethane kunounza matambudziko akasiyana, kunyanya maererano nekugadzikana kwemacatalyst. Macatalyst echinyakare eamine anogona kuratidza kugadzikana kwakaderera mumasisitimu akavakirwa paHFO, zvichikonzera kusawirirana mumhando uye mashandiro efuro. Apa ndipo panowanikwaDMDEEine basa rakakosha.
DMDEE inozivikanwa nekudzikira kweamine activity yayo, izvo zvinoita kuti igare yakasimba kana ikashandiswa muHFO-based polyurethane systems. Kugadzikana uku kwakakosha pakuona kuti furo rinogadzirwa nguva dzose, sezvo richidzivirira kupindirana kusati kwaitika kunogona kukanganisa chimiro chefuro uye hunhu hwekudzivirira. Kuenderana kweDMDEE neHFOs kunoita kuti irambe ichishanda panguva yese yekuburitsa furo, zvichibatsira mukuvaka masero akafanana uye kushanda zvakanaka kwekudzivirira furo.
Kushandiswa Kwakapararira muHFO-StabilizedChinogadzirisaMhinduro
Kugadzikana kweDMDEE nemaHFO kwakaita kuti ishandiswe zvakanyanya mune dzinenge dzese mhinduro dzeHFO-based catalyst. Inonyanya kushanda mukuchengetedza kuenzana pakati pema "reactions" ekuputira ne "crispy", izvo zvakakosha kuti pave ne "foam" yepamusoro ine "thermal insulation properties" yakanaka. Kudzikira kweamine activity yeDMDEE hakungobatsiri chete kugadzikana kwayo asiwo kunobatsira mukugadzirisa maitiro e "reaction" yefoam, zvichiita kuti "foam" iite zvakanaka uye idzorerwe.
Zvinhu Zvinofemera Mukugadzirwa kwePolyurethane Foam
Pamusoro peHFOs, mamwe ma "blowing agents" akasiyana-siyana anoshandiswa mukugadzira ma "polyurethane foams", anosanganisira HFCs, HCFCs, formates, ketones (senge acetone), uye hydrocarbons. Imwe neimwe yeiyi agents ine hunhu hwayo hunogona kukanganisa kusarudzwa kwe "catalysts". Zvisinei, muma "HFO-based systems", kushandiswa kweDMDEE kwave kusingakoshi nekuda kwekugadzikana kwayo uye kushanda kwayo kusingaenzaniswi.
Mukupedzisa, DMDEE catalyst inoita basa rakakosha mukugadzikana kwema HFO-based polyurethane systems, ichivimbisa kuti furo rakanaka uye kushanda zvakanaka kwe insulation. Inoenderana nema HFOs inoita kuti ive chinhu chakakosha mukugadzirisa insulation kwemazuva ano uye ine hushamwari kune zvakatipoteredza.
Nguva yekutumira: Nyamavhuvhu-26-2024