Kungani i-silicone ewuketshezi ingasetshenziswa kabanzi emikhakheni ehlukahlukene?

I-1.Ukwethulwa kwerabha ye-silicone ye-liquid ne-add molding

Irabha ye-silicone ewuketshezi enokwakheka okungeziwe yenziwe nge-vinyl polysiloxane njenge-polymer eyisisekelo, i-polysiloxane ene-Si-H bond njenge-ejenti yokuxhumanisa isiphambano, phambi kwe-platinum catalyst, ekamelweni lokushisa noma ukushisa ngaphansi kwesiphambano esixhumanisa ukuvuvuka kwekilasi le-silicone. izinto zokwakha. Ihlukile kunerabha ye-silicone ewuketshezi ejiyile, inqubo yokwenza i-silicone ye-liquid vulcanization ayikhiqizi imikhiqizo, ukuncipha okuncane, ukubola okujulile futhi akukho ukugqwala kwento yokuxhumana. Inezinzuzo zebanga lokushisa elibanzi, ukumelana namakhemikhali okuhle kakhulu kanye nokumelana nesimo sezulu, futhi inganamathela kalula ezindaweni ezahlukahlukene. Ngakho-ke, uma kuqhathaniswa ne-silicone eyi-condensed liquid, ukuthuthukiswa kokubumba kwe-silicone okuwuketshezi kuyashesha. Njengamanje, isisetshenziswa kabanzi ezintweni zikagesi, imishini, ezokwakha, ezokwelashwa, ezezimoto neminye imikhakha.

2.Izingxenye Eziyinhloko

I-Base Polymer

I-polysiloxane emibili elandelayo equkethe i-vinyl isetshenziswa njengama-polymers ayisisekelo ukuze kufakwe i-silicone ewuketshezi. Ukusabalalisa kwesisindo samangqamuzana kubanzi, ngokuvamile kusuka ezinkulungwaneni kuya ku-100,000-200,000. I-base polymer evame ukusetshenziswa kakhulu ye-additive liquid silicone i-α,ω -divinylpolydimethylsiloxane. Kwatholakala ukuthi isisindo samangqamuzana kanye nokuqukethwe kwe-vinyl kwama-polymers ayisisekelo kungashintsha izakhiwo ze-silicone ewuketshezi.

i-ejenti yokuxhumanisa

I-agent exhumanisayo esetshenziselwa ukwengeza ukubumba i-silicone ewuketshezi yi-polysiloxane ephilayo equkethe amabhondi angaphezu kuka-3 Si-H ku-molecule, njenge-methyl-hydropolysiloxane yomugqa equkethe iqembu le-Si-H, indandatho ye-methyl-hydropolysiloxane ne-MQ resin equkethe iqembu le-Si-H. Okuvame ukusetshenziswa kakhulu yi-linear methylhydropolysiloxane yesakhiwo esilandelayo. Kutholakala ukuthi izakhiwo zemishini yejeli ye-silica zingashintshwa ngokushintsha okuqukethwe kwe-hydrogen noma ukwakheka kwe-ejenti yokuxhumanisa. Ithole ukuthi okuqukethwe kwe-hydrogen ye-ejenti exhumanisayo ilingana namandla aqinile kanye nobulukhuni bejeli ye-silica. UGu Zhuojiang et al. ithole amafutha abicah aqukethe i-hydrogen anesakhiwo esihlukile, isisindo samangqamuzana ahlukene nokuqukethwe kwe-hydrogen okuhlukile ngokushintsha inqubo yokuhlanganisa nefomula, futhi yayisebenzisa njenge-ejenti exhumanisayo ukuze ihlanganise futhi yengeze i-silicone ewuketshezi.

i-catalyzer

Ukuze kuthuthukiswe ukusebenza kahle kwe-catalysts, i-platinum-vinyl siloxane complexes, i-platinum-alkyne complexes kanye ne-nitrogen-modified platinum complexes yalungiswa. Ngaphezu kohlobo lwe-catalyst, inani lemikhiqizo ye-silicone ewuketshezi izophinde ithinte ukusebenza. Ithole ukuthi ukwandisa ukugxila kwe-platinum catalyst kungakhuthaza ukusabela okuxhumanisa phakathi kwamaqembu e-methyl futhi kuvimbele ukubola kweketango eliyinhloko.

Njengoba kushiwo ngenhla, indlela yokwenza i-vulcanization ye-silicone ye-additive liquid yendabuko iwukusabela kwe-hydrosilylation phakathi kwe-base polymer equkethe i-vinyl kanye ne-polymer equkethe ibhondi ye-hydrosilylation. Ukubumba okungeziwe kwe-silicone okujwayelekile okuwuketshezi kuvame ukudinga isikhunta esiqinile ukwenza umkhiqizo wokugcina, kodwa lobu buchwepheshe bendabuko bokukhiqiza bunobubi bezindleko eziphezulu, isikhathi eside, njalo njalo. Imikhiqizo ngokuvamile ayisebenzi emikhiqizweni kagesi. Abacwaningi bathola ukuthi uchungechunge lwama-silicas anezakhiwo eziphakeme lungalungiswa ngamasu okwelapha anoveli kusetshenziswa i-mercaptan - i-double bond add silicas liquid. Izakhiwo zayo ezinhle kakhulu zemishini, ukuzinza kwe-thermal kanye nokudluliswa kokukhanya kungayenza isetshenziswe emikhakheni emisha. Ngokusekelwe ekuphenduleni kwebhondi ye-mercapto-ene phakathi kwe-branched mercaptan functionalized polysiloxane kanye ne-vinyl enqanyuliwe i-polysiloxane enesisindo samangqamuzana ahlukene, ama-silicone elastomers anobulukhuni obulungisekayo kanye nezakhiwo zemishini zalungiswa. Ama-elastomer aphrintiwe akhombisa ukulungiswa okuphezulu kokuphrinta kanye nezakhiwo ezinhle kakhulu zemishini. Ukwelulwa ngesikhathi sokuphumula kwama-silicone elastomers kungafinyelela ku-1400%, okuphakeme kakhulu kunama-elastomers okwelapha e-UV abikiwe futhi aphakeme kakhulu kunawo wonke ama-silicone elastomers alulakayo alulazekayo. Kwabe sekufakwa ama-silicone elastomers anwebeka kakhulu asetshenziswa kuma-hydrogel afakwe ama-carbon nanotubes ukuze kulungiswe izinto zikagesi ezinwebekayo. I-silicone ephrintekayo futhi ecutshungulwayo inamathemba abanzi okusebenza kumarobhothi athambile, ama-actuator avumelana nezimo, izimila zezokwelapha neminye imikhakha.