ʻAʻole like nā PSA silicone a pau. Hiki mai nā ʻokoʻa i ka haku mele polymer (methyl vs. methylphenyl), crosslinking mechanism (peroxide vs. addition cure), a me ka ratio o ka MQ resin me ka lāʻau.
Hoʻohana ʻo Aokai PTFE i nā māka PSA silicone i kā mākou mau lipine. Hōʻike kēia alakaʻi i ka mea e hiki mai ana i ka ikaika ʻili a me ka hui ʻana ma hope o ka ʻelemakule wela kiʻekiʻe no kēlā me kēia papa, a pehea e koho ai i ka mea kūpono no kāu noi.
He aha ka mea e hana ai i ka Silicone PSA ma lalo o ka wela - ʻelua mau ʻano hemahema
I ka wā kahiko i ka wela kiʻekiʻe (200-250°C), hiki i nā PSA silicone ke hoʻololi i ʻelua mau hoʻololi kūʻē:
1. ʻO ka hoʻopili ʻana ma hope (alakaʻi i ka palupalu)
Ke hoʻomau nei nā hui hana ʻole i hana ʻia, e hoʻonui ana i ka nui o ka crosslink. Hiki ke piʻi aʻe ka ikaika o ka ʻili mua no kekahi manawa, a laila hāʻule ʻoi loa i ka paʻa loa ʻana o ka mea hoʻopili. ʻIke ʻia ka piʻi ʻana o ka ikaika shear static, akā ʻoi aku ka maikaʻi o ka paʻa ʻana i ka mana a me ka pale ʻana i ka hopena. Lilo ke kiʻi paʻa i ka paʻakikī a nahā.
2. Hoʻohaʻahaʻa ʻia ka iwi kuamoʻo (alakaʻi i ka nalo ʻili a me ke koena)
ʻO ka polydimethylsiloxane iwi kuamoʻo i ka cyclization a me ke kaulahao scission. Ke hāʻule mau nei ka ikaika o ka peel. Hiki ke hoʻololi ʻia ka mea hoʻopili i ka substrate (koe) a i ʻole hiki ke hoʻopaʻa ʻia. He mea maʻamau kēia i nā PSA methyl silicone haʻahaʻa haʻahaʻa.
Nā ʻāpana hoʻololi kī:
Maʻiʻo Phenyl (ʻoi aku = ʻoi aku ka maikaʻi o ka pale ʻana i ka wela)
ʻO ke ʻano hoʻopaʻapaʻa crosslink a me ke ʻano hoʻōla (lāʻau hoʻohui vs. lāʻau peroxide)
Paʻa ʻili ma hope o ka ʻelemakule (200-250°C): Piʻi iki ka ikaika o ka ʻili i ka wā mua, a laila emi iho. Ma hope o 7 mau lā ma 250 ° C, ʻo 50-70% wale nō ka paʻa ʻana o ka peel . E hāʻule wikiwiki ka hana ma nā wela kiʻekiʻe. ʻO ka hoʻohaʻahaʻa ʻana mai ka cyclization o ka iwi kuamoʻo dimethyl siloxane.
Paʻa paʻa ʻana: ʻO nā mana i hoʻōla ʻia e ka peroxide (e laʻa, KR-101) he koena mea hoʻomaka e hoʻoulu ʻole i ka hoʻōla ʻana ma hope o ka hoʻōla ʻana - paʻa a paʻa ka pipili. Hoʻomaikaʻi ka ikaika ʻāwili mua, akā hāʻule ka mana o ka paʻa ʻana, a hiki ke hoʻopau ʻia ma lalo o ka wela. ʻOi aku ka maikaʻi o nā mana hoʻohui i hoʻōla ʻia akā ua kaupalena ʻia naʻe e ke kū ʻana o ka wela o ka iwi kuamoʻo dimethyl.
2. Methylphenyl polysiloxane
Ka paʻa ʻana o ka ʻili ma hope o ka ʻelemakule: Hoʻopilikia nā kaulahao ʻaoʻao Phenyl i ka hoʻopili maʻamau o nā ʻāpana dimethyl a hoʻopaʻa i ka hoʻohaʻahaʻa cyclization. Ma hope o 7 mau lā ma 250 ° C, ʻoi aku ka ikaika o ka peel ma mua o 85% . Mālama nā mea hoʻokumu kiʻekiʻe-phenyl i nā waiwai peel paʻa a hiki i ka 260-288 ° C.
Paʻa paʻa ʻana: maikaʻi loa. Hoʻololi liʻiliʻi ka ikaika shear; ʻoi aku ka paʻa o ka mana ma mua o 80%. Hiki ke maʻalahi ka papa hoʻopili no ka wā lōʻihi me ka ʻole o ka embrittlement a i ʻole ke koena. ʻO nā māka kiʻekiʻe-phenyl i hoʻohui ʻia ʻo ia ka PSA silicone thermally stable premium.
3. Kūikawā kiʻekiʻe-peel a me haʻahaʻa-peel maʻamau mākau
ʻO nā māka kiʻekiʻe-peel (e laʻa, Dow 7385, ʻili maʻamau> 10N/25mm): ʻO ka hoʻouka ʻana i ka resin MQ kiʻekiʻe e hāʻawi maikaʻi loa i ka ʻili mua a me ka ikaika ʻili, akā ma ke kumu kūʻai o ke kūpaʻa wela a me ka paʻa o ka cohesion. Hōʻike lākou i ka hāʻule nui o ka peel ma hope o ka ʻelemakule a hiki i ke koena ma muli o ka resin thermal decomposition. E hoʻohana wale no nā noi haʻahaʻa haʻahaʻa.
Haʻahaʻa-peel, kiʻekiʻe-cohesion pale kiʻiʻoniʻoni mākaʻikaʻi: Kiʻekiʻe crosslink density hāʻawi i ka paʻa peel hana a me ka maikaʻi o ka ʻelemakule paʻa, akā, haʻahaʻa ka hana mua. Ma hope o ka ʻelemakule, hoʻomau lākou i ka paʻa akā paʻakikī, e hōʻemi ana i ka conformability i nā ʻili ʻōpala.
Mechanism Crosslinking - Peroxide vs. Hoʻohui Hoʻohui (Same Methyl Base)
ʻOiai me ka methyl polymer hoʻokahi, hoʻololi nui ke ʻano hoʻōla i ka ʻelemakule.
1. Ho'ōla ʻia ka peroxide (hanau mua maʻamau)
Hoʻomaka ke koena peroxide i ka hoʻopaʻa ʻole ʻia ma hope o ka hoʻopili ʻana i ka wā ʻelemakule wela.
Piʻi ka ikaika o ka ʻili i ka wā mua, a laila hāʻule loa.
Piʻi ka Cohesion no kekahi manawa, a ma hope o ka embrittlement a me ka paʻa ʻana o ka mana.
ʻAʻole maikaʻi ka paʻa ʻana o ka wā kahiko.
2. Ho'ōla hou ʻia (hydrosilylation curing)
ʻAʻole hoʻopuka ʻo Cure i nā huahana pili; Hiki ke mālama pono ʻia ka ʻupena crosslink.
Hoʻololi ka waiwai ma hope o ka ʻelemakule e hahai ana i kahi ʻano linear hiki ke wānana.
ʻOi aku ka maikaʻi o ka paʻa ʻana o ka peel a me ka paʻa ʻana o ka cohesion i hoʻohālikelike ʻia me nā ʻano hana peroxide.
Ke alakaʻi koho papa
Kūlana lawelawe
Papa Manaʻo
No ke aha mai
ʻO ka wela kiʻekiʻe mau (> 200 ° C), ʻili paʻa, ʻaʻohe koena
Hoʻōla hou, phenyl kiʻekiʻe (e laʻa, Dow 7388, Q2-7406)
> 85% paʻa ʻili, ʻaʻohe embrittlement,> 80% paʻa paʻa mana
Paʻa ʻelemakule maikaʻi akā paʻakikī a liʻiliʻi ke ʻano
Aokai PTFE manaʻo : No kekahi PTFE lipine e ike i ka mālama 'ana ma luna o 200°C, e hoakaka i ka hoʻohui-ho'ōla methylphenyl silicone PSA. ʻOi aku ka kiʻekiʻe o ke kumu kūʻai mua, akā pale ia i nā hemahema o ke kahua i hoʻokumu ʻia e ke koena adhesive a i ʻole nalo paʻa.
Hōʻuluʻulu manaʻo - Hoʻohālikelike i ka Silicone PSA Grade i ka Thermal Demand
ʻO ka methyl-type silicone PSA (ʻoi aku ka peroxide-cured) kūpono wale no ka hoʻohana manawaleʻa a haʻahaʻa paha. Ma hope o 7 mau lā ma 250 ° C, e manaʻo ʻia he 30-50% ka nalowale ʻana o ka ʻili a hiki ke hoʻopau ʻia.
ʻO ka Methylphenyl (kiʻekiʻe-phenyl) silicone PSA e paʻa i ka> 85% ka ikaika o ka peel a me ka hoʻohui maʻalahi ma hope o ka ʻelemakule like. ʻO ia ke koho no ka lawelawe hoʻomau 200-250 ° C.
ʻOi aku ka paʻa o ka lāʻau hoʻohui (hydrosilylation) ma mua o ka lāʻau peroxide.
nā māka kiʻekiʻe-peel i ke kūpaʻa ʻelemakule no ka hoʻopaʻa mua - pale iā lākou i nā noi wela. Kūʻai
No ke koi ʻana i ka hoʻopaʻa ʻana i ka wela kiʻekiʻe, hoʻohana ʻo Aokai PTFE i nā PSAs methylphenyl silicone i hoʻohui ʻia. Hiki iā mākou ke hāʻawi i ka ʻikepili paʻa peel ma hope o 1000h ma 250 ° C ma ke noi.
