Iyo a PTFE yerekana ubushyuhe bwo hejuru ikoreshwa ahantu hashyushye - vuga, 200 ° C mu byumweru cyangwa ukwezi - icyuma cya silicone cyunvikana (PSA) kirashobora guhinduka. Imbaraga zishishwa zirashobora kuzamuka, kugwa, cyangwa kwimura ibisigisigi. Guhuriza hamwe birashobora kwiyongera (brittleness) cyangwa kugabanuka (gutsindira hamwe).
Ntabwo silicone PSAs yose yitwara kimwe. Itandukaniro riza kumiterere ya polymer (methyl na methylphenyl), uburyo bwo guhuza (peroxide vuga umuti wongeyeho), hamwe nikigereranyo cya MQ resin na rubber.
Aokai PTFE ikoresha amanota menshi ya silicone PSA muri kasete zacu. Aka gatabo gasobanura ibiba kumashanyarazi no guhuriza hamwe nyuma yubushyuhe bwo hejuru kuri buri cyiciro, nuburyo bwo guhitamo igikwiye kubyo usaba.
Bigenda bite kuri Silicone PSA munsi yubushyuhe - Uburyo bubiri bwo kunanirwa
Iyo ushaje mubushyuhe bwinshi (200-250 ° C), silicone PSAs irashobora guhinduka muburyo bubiri:
1. Nyuma yo guhuza (biganisha ku bugome)
Amatsinda yimikorere idakomeje akomeza kubyitwaramo, byongera ubwuzuzanye. Imbaraga zambere zishobora kuzamuka byigihe gito, hanyuma zikagwa cyane nkuko ibifatika biba bikomeye. Imbaraga zogosha zihamye zisa nkiyiyongera, ariko gufata imbaraga ningaruka zo kurwanya ingaruka biragenda nabi. Firime ifata iba ikomeye kandi igacika.
2. Kwangirika kw'umugongo (biganisha ku gutakaza ibishishwa n'ibisigara)
Umugongo wa polydimethylsiloxane unyura mukuzunguruka no kunyunyuza urunigi. Imbaraga zishishwa zigabanuka ubudahwema. Ibifatika birashobora kwimura substrate (ibisigara) cyangwa bikananirana hamwe. Ibi birasanzwe muri methyl silicone yo mu rwego rwo hasi PSAs.
Ibyingenzi byingenzi byo guhindura:
Ibirimo bya fenyl (birenze = birwanya ubushyuhe bwiza)
Ubwinshi bwa crosslink nubwoko bukiza (wongeyeho umuti na peroxide ikiza)
Ikigereranyo cya MQ resin kuri silicone rubber
Ibyiciro Byiciro Byuburyo bwa Shimi
1. Polydimethylsiloxane isanzwe (methyl yo mu bwoko bwa silicone PSA)
Kugumana ibishishwa nyuma yo gusaza (200-250 ° C): Imbaraga zishishwa zizamuka mbere, hanyuma zigabanuka. Nyuma yiminsi 7 kuri 250 ° C, kugumana ibishishwa ni 50-70% gusa . Imikorere igabanuka vuba kubushyuhe bwo hejuru. Gutesha agaciro biva kuri cycleisation ya dimethyl siloxane umugongo.
Guhuriza hamwe: Peroxide-yakize verisiyo (urugero, KR-101) ifite intangiriro zisigaye zitera gukira nyuma yo gukira - gukomera gukomera no gusohora. Imbaraga zogosha zambere zitera imbere, ariko gufata imbaraga bigabanuka, kandi kunanirwa gufatana bibaho munsi yubushyuhe. Kwiyongera-gukize verisiyo nibyiza gato ariko biracyagarukira kubutaka bubi burwanya ubushyuhe bwa dimethyl.
2. Methylphenyl polysiloxane (urwego rwo hejuru rwubushyuhe bwo hejuru)
Kugumana ibishishwa nyuma yo gusaza: Urunigi rwuruhande rwa fenyl ruhagarika gupakira buri gihe ibice bya dimethyl no guhagarika kwangirika kwizuba. Nyuma yiminsi 7 kuri 250 ° C, kugumana imbaraga zishishwa birenga 85% . Ifumbire mvaruganda ikomeza igishishwa gihamye ndetse no kuri 260-288 ° C.
Guhuza ubumwe: Byiza. Imbaraga zogosha zihinduka bike; gufata imbaraga zirenga 80%. Igice gifatika gikomeza guhinduka igihe kirekire nta gushiramo cyangwa ibisigara. Kwiyongera-gukira-amanota menshi ya fenyl ni prium yubushyuhe bwa silicone PSA.
3. Impamyabumenyi zidasanzwe-zishishwa hamwe nuduce duto duto twihariye
Impamyabumenyi yo hejuru cyane (urugero, Dow 7385, igishishwa gisanzwe> 10N / 25mm): Kwipakurura hejuru ya MQ itanga uburyo bwiza bwambere bwo gukuramo imbaraga hamwe nigishishwa, ariko kubiciro byo kurwanya ubushyuhe no guhuriza hamwe. Zerekana igishishwa kinini nyuma yo gusaza kandi zikunda gusigara kubera resin yangirika. Koresha gusa mugihe gito-ubushyuhe bwo gusaba.
Igipimo gito-cyinshi, co-cohesion irinda firime amanota: Ubwinshi bwambukiranya imipaka butanga imikorere ihamye hamwe nubusaza buhebuje, ariko buke bwambere. Nyuma yo gusaza, bakomeza guhuriza hamwe ariko bagakomera, bikagabanya guhuza nubutaka bubi.
Uburyo bwo guhuza - Peroxide vs Umuti wongeyeho (Base Methyl Base)
Ndetse hamwe na methyl polymer imwe, uburyo bwo gukiza buhindura cyane imyitwarire yo gusaza.
1. Peroxide-yakize (ibisekuruza bisanzwe)
Peroxide isigaye itera kutagenzurwa nyuma yo guhuza mugihe cyo gusaza kwinshi.
Imbaraga zishishwa zambere, hanyuma zisenyuka bikabije.
Cohesion izamuka by'agateganyo, ikurikirwa no gushiramo no gufata imbaraga zo kunanirwa.
Batch-to-batch gusaza bihoraho ni bibi.
2. Kwiyongera-gukira (hydrosilylation curing)
Umuti utanga umusaruro; imiyoboro ihuza imiyoboro irashobora kugenzurwa neza.
Nyuma yumusaza impinduka zumutungo zikurikira umurongo uteganijwe.
Kugumana kure cyane igishishwa hamwe no guhuzagurika ugereranije na peroxide.
Amabwiriza yo gutoranya amanota
Imiterere ya serivisi |
Icyiciro Cyifuzo |
Kubera iki |
Ubushyuhe bwo hejuru bukomeza (> 200 ° C), igishishwa gihamye, ibisigisigi bya zeru |
Ongeraho-ukize, fenile nyinshi (urugero, Dow 7388, Q2-7406) |
> 85% kubika ibishishwa, nta embrittlement,> 80% bifata imbaraga zo kugumana |
Rimwe na rimwe igihe gito ubushyuhe bwinshi, bworoshye-ikiguzi |
Ubwoko bwa methyl busanzwe, bwongeyeho-bwakize, nyuma yo guteka byakize (urugero, 7657) |
Biremewe ariko witege ko igishishwa cyangirika hamwe nibishobora kwinjizwa mugihe kirekire |
Igishishwa kinini cyane cyambere gikenewe, ubushyuhe buke gusa |
Urwego rwohejuru rwa methyl |
Ntabwo ari ubushyuhe bukabije; tegereza ibisigara nyuma yo gusaza |
Filime ikingira, guhuzagurika cyane, tack nke |
Urwego rwo hejuru-rwuzuza urwego rwo hasi |
Ubwiza buhebuje bwo gusaza ariko bukomeye kandi budahuye |
Icyifuzo cya Aokai PTFE : Kuri kaseti iyo ari yo yose ya PTFE izabona ubushyuhe burambye buri hejuru ya 200 ° C, vuga methylphenyl silicone PSA yongeyeho. Igiciro cyo hejuru kiri hejuru, ariko kirinda kunanirwa kumurima biterwa nigisigara gifatika cyangwa igihombo.
Inshamake - Guhuza Icyiciro cya Silicone PSA Icyifuzo Cyubushyuhe
Methyl yo mu bwoko bwa silicone PSA (cyane cyane peroxide-yakize) irakwiriye gusa gukoreshwa rimwe na rimwe cyangwa ubushyuhe buke. Nyuma yiminsi 7 kuri 250 ° C, tegereza igihombo cya 30-50% nibishoboka.
Methylphenyl (high-fenyl) silicone PSA igumana> 85% imbaraga zishishwa hamwe no guhuza byoroshye nyuma yo gusaza. Nuguhitamo serivisi ikomeza 200-250 ° C.
Uburyo bwo guhuza ibintu bifite akamaro kanini: umuti wongeyeho (hydrosilylation) urahagaze neza kuruta umuti wa peroxide.
Impamyabumenyi yo hejuru cyane igurisha gusaza kumurongo wambere - wirinde mubikorwa bishyushye.
Kubisaba guhuza ubushyuhe bwo hejuru, Aokai PTFE ikoresha methylphenyl silicone PSAs yongeyeho. Turashobora gutanga amakuru yo kubika ibishishwa nyuma ya 1000h kuri 250 ° C tubisabwe.
Ibikoresho bya tekiniki byatanzwe na Jiangsu Aokai Ibikoresho bishya Ikoranabuhanga Co, Ltd.
Kumakuru arambuye ya tekiniki hamwe nibisubizo byabigenewe bya PTFE yubushyuhe bwo hejuru, kaseti, imikandara ya mesh, nibindi byinshi:
Dukurikije ubunyangamugayo nubunyangamugayo, dutanga igisubizo kimwe cyihariye cyo gukemura hamwe na serivisi yatekerejwe nyuma yo kugurisha.
