Kungani i-silicone ewuketshezi ingasetshenziswa kabanzi emikhakheni eyahlukahlukene?

1.Isingeniso serabha ye-silicone ewuketshezi enokwakheka okwengeziwe

Irabha ye-silicone ewuketshezi enokwakheka okwengeziwe yakhiwe yi-vinyl polysiloxane njenge-polymer eyisisekelo, i-polysiloxane enesibopho se-Si-H njenge-ejenti yokuxhumanisa evundlile, lapho kukhona i-catalyst yeplatinum, ekushiseni kwegumbi noma ekushiseni ngaphansi kwe-cross linking vulcanization yeklasi yezinto ze-silicone. Ngokungafani nerabha ye-silicone ewuketshezi evundlile, inqubo yokwakheka kwe-silicone ewuketshezi evundlile ayikhiqizi imikhiqizo elandelanayo, ukuncibilika okuncane, i-vulcanization ejulile kanye nokungagqwali kwezinto zokuthintana. Inezinzuzo zobubanzi bokushisa, ukumelana kwamakhemikhali okuhle kakhulu kanye nokumelana nesimo sezulu, futhi inganamathela kalula ezindaweni ezahlukahlukene. Ngakho-ke, uma kuqhathaniswa ne-condensed liquid silicone, ukuthuthukiswa kwe-liquid silicone molding kuyashesha. Njengamanje, isetshenziswe kabanzi kakhulu ezintweni zikagesi, imishini, ukwakhiwa, ezokwelapha, izimoto nakweminye imikhakha.

2. Izingxenye Eziyinhloko

Isisekelo sePolymer

I-polysiloxane emibili elandelayo eqondile equkethe i-vinyl isetshenziswa njenge-base polymers yokwengeza i-liquid silicone. Ukusatshalaliswa kwesisindo sayo sama-molecule kubanzi, ngokuvamile kusuka ezinkulungwaneni kuya ku-100,000-200,000. I-base polymer esetshenziswa kakhulu kwi-liquid silicone engeziwe yi-α,ω-divinylpolydimethylsiloxane. Kutholakale ukuthi isisindo sama-molecule kanye nokuqukethwe kwe-vinyl kwama-polymer ayisisekelo kungashintsha izakhiwo ze-liquid silicone.

i-ejenti yokuxhumanisa

I-ejenti yokuxhumanisa esetshenziselwa ukwengeza i-silicone ewuketshezi yokubumba yi-polysiloxane ephilayo equkethe izibopho ze-Si-H ezingaphezu kwezingu-3 ku-molecule, njenge-linear methyl-hydropolysiloxane equkethe iqembu le-Si-H, i-ring methyl-hydropolysiloxane kanye ne-MQ resin equkethe iqembu le-Si-H. Ezisetshenziswa kakhulu yi-linear methylhydropolysiloxane yesakhiwo esilandelayo. Kutholakale ukuthi izakhiwo zemishini ze-silica gel zingashintshwa ngokushintsha okuqukethwe kwe-hydrogen noma isakhiwo se-cross linking agent. Ithole ukuthi okuqukethwe kwe-hydrogen kwe-cross linking agent kuhambelana namandla okuthamba kanye nobunzima be-silica gel. UGu Zhuojiang nabanye bathole uwoyela we-silicone oqukethe i-hydrogen onesakhiwo esihlukile, isisindo sama-molecule esihlukile kanye nokuqukethwe kwe-hydrogen okuhlukile ngokushintsha inqubo yokwenziwa kanye nefomula, futhi bayisebenzisa njenge-cross linking agent yokuhlanganisa nokwengeza i-silicone ewuketshezi.

i-catalyzer

Ukuze kuthuthukiswe ukusebenza kahle kwe-catalyst kwama-catalyst, kwalungiswa ama-complex e-platinum-vinyl siloxane, ama-complex e-platinum-alkyne kanye nama-complex e-platinum aguquliwe yi-nitrogen. Ngaphezu kohlobo lwe-catalyst, inani lemikhiqizo ye-silicone ewuketshezi lizothinta nokusebenza. Kutholakale ukuthi ukwandisa ukuhlushwa kwe-catalyst ye-platinum kungakhuthaza ukusabela okuxhumanisayo phakathi kwamaqembu e-methyl futhi kuvimbele ukubola kweketanga eliyinhloko.

Njengoba kushiwo ngenhla, indlela yokwenza i-vulcanization ye-silicone yendabuko yokwengeza uketshezi iyindlela yokusabela kwe-hydrosilylation phakathi kwe-polymer eyisisekelo equkethe i-vinyl kanye ne-polymer equkethe i-hydrosilylation bond. Ukubunjwa kwe-silicone yendabuko yokwengeza uketshezi ngokuvamile kudinga isikhunta esiqinile ukuze kukhiqizwe umkhiqizo wokugcina, kodwa lobu buchwepheshe bokukhiqiza bendabuko bunezinkinga zezindleko eziphakeme, isikhathi eside, njalo njalo. Imikhiqizo ivame ukusebenza emikhiqizweni kagesi. Abacwaningi bathole ukuthi uchungechunge lwama-silica anezakhiwo eziphakeme lungalungiswa ngamasu amasha okwelapha kusetshenziswa i-mercaptan - i-double bond addition liquid silicas. Izakhiwo zayo ezinhle kakhulu zomshini, ukuzinza kokushisa kanye nokudluliselwa kokukhanya kungenza ukuthi isetshenziswe emikhakheni emisha eminingi. Ngokusekelwe ekuphenduleni kwesibopho se-mercapto-ene phakathi kwe-branched mercaptan functionalized polysiloxane kanye ne-vinyl terminated polysiloxane enesisindo sama-molecule ahlukene, kwalungiswa ama-silicone elastomers anobunzima obulungisekayo kanye nezakhiwo zomshini. Ama-elastomers aphrintiwe abonisa ukulungiswa okuphezulu kokuphrinta kanye nezakhiwo ezinhle kakhulu zomshini. Ukunwebeka lapho kuphuka ama-silicone elastomers kungafinyelela ku-1400%, okuphakeme kakhulu kune-UV curing elastomers ebikiwe futhi kuphakeme ngisho nangaphezu kwe-thermal curing silicone elastomers enwebeka kakhulu. Kwabe sekusetshenziswa ama-silicone elastomers anwebeka kakhulu kuma-hydrogel afakwe ama-carbon nanotubes ukulungiselela amadivayisi kagesi anwebekayo. I-silicone ephrintwayo necutshungulwayo inamathuba amaningi okusetshenziswa kumarobhothi athambile, ama-actuator aguquguqukayo, ama-implant ezokwelapha kanye neminye imikhakha.