Nei mvura silicone inogona kushandiswa zvakanyanya munzvimbo dzakasiyana siyana?

1.Introduction ye liquid silicone rubber nekuwedzera molding

liquid silicone rabha ine kuwedzera kuumbwa inoumbwa nevinyl polysiloxane seyakakosha polymer, polysiloxane ine Si-H bond semuchinjiko wekubatanidza mumiriri, pamberi peplatinamu catalyst, pakamuri tembiricha kana kupisa pasi pemuchinjikwa kubatanidza vulcanization yekirasi yesilicone. zvinhu. Yakasiyana kubva yakanyungudutswa mvura silicone rabha, kuumba yemvura silicone vulcanization process haiburitse ne-zvigadzirwa, diki shrinkage, yakadzika vulcanization uye hapana ngura yezvinhu zvekusangana. Iyo ine mabhenefiti ehupamhi tembiricha renji, yakanakisa makemikari kuramba uye mamiriro ekunze, uye inogona kunamatira nyore kune akasiyana siyana. Naizvozvo, kana ichienzaniswa neyakaomeswa mvura silicone, kuvandudza kwemvura silicone molding kunokurumidza. Parizvino, yave ichinyanya kushandiswa zvakanyanya mumidziyo yemagetsi, michina, kuvaka, kurapwa, mota uye mamwe minda.

2.Main Components

Base Polymer

Aya maviri anotevera mutsara polysiloxane ine vinyl anoshandiswa se base mapolymers ekuwedzera emvura silicone. Kugoverwa kwavo kwema molecular huremu hwakakura, kazhinji kubva kuzviuru kusvika ku100,000-200,000. Iyo inonyanya kushandiswa base polymer yeaddive liquid silicone is α,ω -divinylpolydimethylsiloxane. Zvakaonekwa kuti molecular huremu uye vinyl zvirimo zvemapolymers ekutanga zvinogona kushandura zvimiro zvesilicone yemvura.

cross-linking agent

Iyo crosslinking agent inoshandiswa kuwedzera molding liquid silicone ndiyo organic polysiloxane ine anopfuura 3 Si-H mabhondi mumorekuru, senge linear methyl-hydropolysiloxane ine Si-H boka, mhete methyl-hydropolysiloxane uye MQ resin ine Si-H boka. Inonyanya kushandiswa ndeye mutsara methylhydropolysiloxane yeinotevera chimiro. Inowanikwa kuti ma mechanic properties ye silica gel inogona kuchinjwa nekushandura hydrogen content kana chimiro chemuchinjikwa wekubatanidza mumiririri. Yakaona kuti iyo hydrogen yemukati meiyo crosslinking agent inoenderana nekusimba kwesimba uye kuoma kwesilica gel. Gu Zhuojiang et al. yakawana hydrogen-ine silicone mafuta ane chimiro chakasiyana, akasiyana mamorekuru uye akasiyana ehydrogen zvemukati nekushandura synthesis maitiro uye fomula, uye akaishandisa se crosslinking agent kugadzira uye kuwedzera mvura silicone.

catalyzer

Kuti uvandudze kushandiswa kwekugadzirisa kwezvinokonzera, platinum-vinyl siloxane complexes, platinum-alkyne complexes uye nitrogen-modified platinum complexes yakagadzirwa. Pamusoro pemhando yecatalyst, huwandu hwezvigadzirwa zvesilicone yemvura zvinozokanganisa mashandiro acho. Yakawana kuti kuwedzera kuwanda kweplatinum catalyst kunogona kusimudzira maitiro ekubatanidza pakati pemapoka emethyl uye kumisa kuparara kweketani huru.

Sezvambotaurwa pamusoro apa, iyo vulcanization meshini yechinyakare yekuwedzera mvura silicone ndiyo hydrosilylation reaction pakati pe base polymer ine vinyl uye iyo polymer ine hydrosilylation bond. Iyo yechinyakare liquid silicone yekuwedzera molding inowanzoda kuomarara mold kugadzira chigadzirwa chekupedzisira, asi iyi yechinyakare yekugadzira tekinoroji ine zvakaipira kudhura kwakanyanya, nguva refu, zvichingodaro. Zvigadzirwa kazhinji hazvishande kune zvigadzirwa zvemagetsi. Vatsvagiri vakawana kuti nhevedzano yesilica ine yepamusoro zvivakwa inogona kugadzirwa neinoveli kurapa matekiniki vachishandisa mercaptan - kaviri bond yekuwedzera liquid silicas. Yayo yakanakisa mechanicha zvimiro, kugadzikana kwekupisa uye mwenje transmittance inogona kuita kuti ishandiswe mune mamwe minda mitsva. Kubva pane mercapto-ene bond reaction pakati pebranched mercaptan functionalized polysiloxane uye vinyl yakamiswa polysiloxane ine akasiyana mamorekuru uremu, silicone elastomers ine inogadziriswa kuoma uye michina zvivakwa zvakagadzirirwa. Akadhindwa elastomers anoratidza yakakwirira kudhinda resolution uye yakanakisa mechaniki zvivakwa. Iyo elongation panguva yekuzorora yesilicone elastomers inogona kusvika 1400%, iyo yakakwira zvakanyanya kupfuura yakashumwa UV yekurapa elastomers uye yakatokwirira kupfuura yakanyanya kutsetseka yemafuta ekurapa silicone elastomers. Ipapo ma-ultra-stretchable silicone elastomers akaiswa kune mahydrogel akaiswa kabhoni nanotubes kugadzirira zvinotambanuka zvemagetsi. Inodhindwa uye inogadziriswa silicone ine yakafara tarisiro yekushandisa mumarobhoti akapfava, anochinjika actuators, ekurapa anodyara uye mamwe minda.