Purasitiki yePolyurethane (PU)
* Polyurethane (PU) ipfupiso yepolyurethane, polyisocyanate uye polyhydroxy polymer polymerization, iri muketani huru yemapolymer ine zvikamu zvakawanda zve repetitive urethane chain segments (-NHCOO-) yemapolymer compounds.
* Zvigadzirwa zvepurasitiki zvePU zvakagadzirwa
Polyurethane, inozivikanwawo se polyurethane ne polyurethane, imhando yema macromolecules ane urethane characteristic units muketani huru. Rudzi urwu rwepolymer rune elasticity yerabha uye simba uye kugona kwayo kugadzira mapurasitiki, uye rune kukosha kukuru muminda mikuru minomwe yepurasitiki, rabha, furo, fiber, coatings, adhesives uye functional polymers. Mumaindasitiri inoshandiswa zvakanyanya mumatayi ane kumhanya kwakaderera, magaskets, mamota emota nedzimwe nzvimbo. Muhupenyu hwezuva nezuva, polyurethane inoshandiswa kugadzira mhando dzakasiyana dzefuro nepurasitiki.
Chii chaunogona kugadzira nePU Plastiki?
Ma polyurethane elastomers imhando yezvinhu zvine hunhu hwerabha nepurasitiki, zvine simba rakanaka rekudhonza, simba rekubvaruka, simba rekurova, simba rekukuruka, simba remamiriro ekunze, simba rehydrolysis, simba remafuta nezvimwe zvakanakira.
Inonyanya kushandiswa sezvinhu zvekuvaka (senge mapombi, magasket, mabhandi, maroller, magiya, mapaipi, nezvimwewo), zvinodzivirira kupisa, tsoka dzeshangu nematayi akasimba. Semuenzaniso, sendiro yekusefa yemugodhi, ine ruzha rwakaderera, inopindira zvakanyanya uye inodzivirira kupfekwa kupfuura ndiro yekusefa yesimbi yechinyakare. Pamusoro pezvo, polyurethane ine biocompatibility yakanaka, sezvinhu zvekurapa, inogona kushandiswa muzvigadziri zvemoyo, mitsipa yeropa yekugadzira, mapfupa ekugadzira, nezvimwewo.
Izvi zvinotevera zvimwe zvezvinoshandiswa paPolyurethane (PU)
- Kutakurwa
- Kuvaka
- Michina
- Midziyo yemagetsi
- Fenicha
- Kugadzira Chikafu
- Machira nezvipfeko
- Dehwe rekugadzira
- Kudhinda
- Indasitiri yemafuta
- Mitambo
- Nezveutano
Hunhu hwePolyurethane (PU)
* Foam yepolyurethane yakakamurwa kuita mhando mbiri: furo rakasimba uye furo rinochinjika, rine kutwasuka kwakanaka, kureba, simba rekudzvanya uye kuchinjika, pamwe nekugadzikana kwakanaka kwemakemikari. Pamusoro pezvo, furo repolyurethane rine kugona kugadzikiswa, kunamira, kuputira uye zvimwe zvinhu, zvichibatsira pakushanda zvakanaka kwechinhu chinonamatira.
Nekuda kwemaumbirwo ayo, elastomer yepolyurethane ine zvikamu zviviri zvecheni zvakapfava, zvakaoma, saka cheni yemamorekuru inogona kugadzirwa kuti ipe zvinhu simba rakawanda, kusimba kwakanaka, kusakara, kusakara mafuta nezvimwe zvinhu zvakanaka, zvinozivikanwa se "rubber inodzivirira kusakara" polyurethane panguva imwe chete nekusimba kwakanyanya kwerabha uye kuomarara kwepurasitiki.
* Zvinhu zvepolyurethane zvine polarity yakasimba, izvo zvinoita kuti zvikwanise kubatana zvakasimba nezvinhu zvakawanda uye zvinogona kushandiswa semanamati muchikamu chekubatanidza.
* Zvinonamira zvepolyurethane zvinonyanya kushandiswa mumapakeji, kuvaka, huni, mota, uye maindasitiri eshangu.
Zvinhu zvePolyurethane (PU) zvinogadzirwa sei?
Nekuda kwekusagadzikana kwakasimba kwepolyurethane mumvura, nzira itsva yekugadzira inofanira kushandiswa kugadzira emulsion yePU, maitiro ekugadzira epolyurethane inofambiswa nemvura ndeaya anotevera: ① ne oligomer polyol, chain extender, diisocyanate kuti igadzire molecular mass yakakura yePU pre-polymer; ② inobviswa mushure mekunge pre-polymer yasanganiswa mumvura kuti iite dispersion.
Nzira dzekugadzirira emulsion yepolyurethane dzine mapoka maviri makuru: nzira ye emulsification yekunze uye nzira ye emulsification yemukati.
1. Nzira ye emulsification yekunze inzira yekumanikidza emulsification kana paine emulsifier, high shear.
2. Nzira yekuzvisanganisa inoitwa nekuisa mapoka emvura mumasero epolyurethane.
Mapoka anonyungudutsa mumvura anounzwa mumapfupa ePU molecular skeleton nekuwedzera kwecheni kwemamonomer anonyungudutsa mumvura, ayo anoumbwa nemapoka anogadzira munyu uye ma reagents anogadzira munyu.
Kudzokorodza mapurasitiki ePolyurethane (PU)
- Kudzokorodza kwepurasitiki yePolyurethane (PU) Inogona kuiswa muzvikamu zviviri: kudzokorodza kwepanyama uye kwemakemikari.Kudzokorodza panyama kunopa nzira inoshanda uye isingadhuri yekudzokorodza furo rakasimba repolyurethane uye zvinhu zvakasanganiswa. Saizi yechinhu chepakutanga che polyurethane foam inotanga yaderedzwa kusvika padanho rinogona kugadziriswazve mukuita kwechipiri. Marara akadzokorodzwa, kana kuti zvakachekwa kubva mukugadzirwa, zvinoderedzwa kuita mafomu anobatsira akadai semaflakes, granules kana powders.Kudzokorodza mishonga yemakemikari inzira yekuputsa ma polyurethane furo kuita zvinhu zvisina kugadzirwa zve polyurethane kana zvimwe zvinhu zvisina kugadzirwa zvemakemikari uchishandisa alcoholysis, amineysis, hydrolysis kana pyrolysis. Polyurethane furo ine urethane ne urea bonds. Mukuita alcoholysis, aminolysis uye alkali hydrolysis, urethane ne urea bonds mu polyurethane molecule zvinopwanyika uye zvinoora kuita polyols, aromatic polyamines, carbon dioxide nezvimwewo.
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