Silicone PSA Ka mor'a Botsofali bo Phahameng ba Mocheso: Matla a Peel le Momahano ka Kereiti

Ha a Theipi ea PTFE e nang le mocheso o phahameng oa mocheso e sebelisoa sebakeng se chesang - ho re, 200 ° C ka libeke kapa likhoeli - sekhomaretsi sa silicone se nang le khatello ea kelello (PSA) se ka fetoha. Matla a peel a ka phahama, a oa, kapa a fetisetsa masala. Kamano e ka 'na ea eketseha (brittleness) kapa ea fokotseha (ho hlōleha ho kopanngoa).

Ha se li-PSA tsohle tsa silicone tse itšoarang ka tsela e tšoanang. Phapang e theohela ho sebopeho sa polymer (methyl vs. methylphenyl), crosslinking mechanism (peroxide vs. addition cure), le karolelano ea MQ resin ho rabara.

Aokai PTFE e sebelisa limaraka tse ngata tsa silicone PSA litheiping tsa rona. Tataiso ena e hlalosa se etsahalang ho ebola matla le momahano ka mor'a botsofali bo phahameng ba mocheso bakeng sa sehlopha ka seng, le mokhoa oa ho khetha e nepahetseng bakeng sa kopo ea hau.

Ho Etsahala'ng ka Silicone PSA Tlas'a Mocheso - Mekhoa e 'meli ea ho hloleha

Ha o tsofetse ka mocheso o phahameng (200-250 ° C), silicone PSAs e ka ba le liphetoho tse peli tse hanyetsanang:

1. Post-crosslinking (e lebisa ho brittleness)

Lihlopha tse sebetsang tse sa sebetseng li ntse li tsoela pele ho itšoara, ho eketsa sekhahla sa crosslink. Matla a pele a lekhapetla a ka nyoloha ka nakoana, ebe a oa haholo ha sekhomaretsi se ntse se tiea haholo. Matla a ho kuta a tsitsitseng a bonahala a ntse a eketseha, empa ho tšoara matla le ho hanyetsa tšusumetso hoa senyeha. Filimi ea sekhomaretsi e ba thata 'me e phunye.

2. Ho senyeha ha mokokotlo (ho lebisa ho ebola tahlehelo le masala)

Mokokotlo oa polydimethylsiloxane o feta cyclization le ketane scission. Matla a peel a theoha a sa khaotse. Sekhomaretsi se ka fetisetsa substrate (masala) kapa se hlōleha ho lumellana. Sena se tloaelehile ho li-PSA tsa methyl silicone tsa boemo bo tlase.

Li-parameter tsa bohlokoa tsa modulating:

• Likahare tsa Phenyl (tse phahameng = ho hanyetsa mocheso hamolemo)

• Crosslink density le mofuta oa pheko (pheko ea tlatsetso khahlano le pheko ea peroxide)

• Karolelano ea resin ea MQ ho rabara ea silicone

Lihlopha tsa Kereiti ka Sebopeho sa Lik'hemik'hale

1. Polydimethylsiloxane e tloaelehileng (methyl-type silicone PSA)

• Ho boloka peel ka mor'a botsofali (200-250 ° C): Matla a peel a nyoloha hanyenyane qalong, ebe a fokotseha. Kamora matsatsi a 7 ho 250 ° C, ho boloka lekhapetla ke 50-70% feela . Ts'ebetso e theoha ka potlako ho mocheso o phahameng. Ho senyeha ho tsoa ho cyclization ea mokokotlo oa dimethyl siloxane.

• Ho tsitsa ha momahano: Liphetolelo tse phekoloang ka peroxide (mohlala, KR-101) li na le li-initiator tse setseng tse bakang ho sa laoleheng ka mor'a ho phekola - sekhomaretsi se thatafatsa le ho embrittles. Matla a pele a ho kuta aa ntlafala, empa ho ts'oara marotholi a matla, 'me ho hlōleha ho kopane ho etsahala tlas'a mocheso. Liphetolelo tsa tlatsetso li betere hanyane empa li ntse li lekantsoe ke ho hanyetsa mocheso oa tlhaho oa mokokotlo oa dimethyl.

2. Methylphenyl polysiloxane (kereiti e hanyetsanang le mocheso o phahameng)

• Ho boloka lekhapetla ka mor'a botsofali: liketane tsa mahlakoreng a Phenyl li sitisa ho paka khafetsa ha likarolo tsa dimethyl le ho hatella ho senyeha ha cyclization. Kamora matsatsi a 7 ho 250 ° C, ho boloka matla a peel ho feta 85% . Mefuta e phahameng ea phenyl e boloka thepa e tsitsitseng ea lekhapetla esita le ho 260-288 ° C.

• Ho tsitsa ha momahano: E babatsehang. Matla a ho kuta a fetoha hanyane; ho boloka matla ho feta 80%. The sekhomaretsi lera lula tenyetseha nako e telele ntle embrittlement kapa masala. Limaraka tse phahameng tsa phenyl tse phekotsoeng ke silicone PSA e tsitsitseng ka mocheso.

3. Limaraka tse khethehileng tsa peel e phahameng le e tlase ea peeletso

• Limaraka tse phahameng haholo (mohlala, Dow 7385, lekhapetla le tloaelehileng> 10N/25mm): Ho jara resin ea MQ e phahameng ho fana ka matla a pele a matla le matla a peeletso, empa ka litšenyehelo tsa ho hanyetsa mocheso le botsitso ba momahano. Li bontša lerotholi le leholoanyane ka mor'a ho tsofala 'me li atisa ho sala ka lebaka la ho bola ha resin ka mocheso. Sebelisa feela bakeng sa lisebelisoa tsa nakoana tsa mocheso o tlase.

• Lifilimi tse sirelletsang tse nang le peel e tlase, tse nang le momahano o phahameng: Boima bo phahameng ba li-crosslink bo fana ka ts'ebetso e tsitsitseng ea peel le botsitso bo botle ba botsofali, empa tack ea pele e tlase. Kamora ho tsofala, li lula li momahane empa li thatafala, li fokotsa ho lumellana le libaka tse mahoashe.

Crosslinking Mechanism – Peroxide vs. Addition Cure (Same Methyl Base)

Leha e na le methyl polymer e tšoanang, mokhoa oa ho folisa o fetola haholo boitšoaro ba botsofali.

1. Phekolo ea peroxide (e tloaelehileng moloko oa pele)

• Peroxide e setseng e baka ho sa laoleheng post-crosslink nakong ea botsofali bo phahameng ba mocheso.

• Li-spikes tsa matla a peel qalong, ebe li oa haholo.

• Momahano oa phahama ka nakoana, o lateloa ke ho ferekana le ho tšoara matla a fokolang.

• Botsofali ba batch-to-batch bo fosahetse.

2. Tlatsetso-fola (hydrosilylation curing)

• Pheko ha e hlahise lihlahisoa; marang-rang a crosslink a laoleha hantle.

• Liphetoho tsa thepa ea ka mor'a botsofali li latela mokhoa o ka tsejoang esale pele.

• Ho boloka lekhapetla le phahameng haholo le botsitso ba momahano ha ho bapisoa le metsoako ea peroxide.

Tataiso ea Khetho ea Kereiti

Khothaletso ea Aokai PTFE : Bakeng sa teipi efe kapa efe ea PTFE e tla bona mocheso o tsitsitseng o ka holimo ho 200 ° C, bolela ka ho eketsehileng-phekotsoe methylphenyl silicone PSA. Theko ea pele e phahame, empa e thibela ho hlōleha ha masimo ho bakoang ke masala a sekhomaretsi kapa tahlehelo ea bond.

Kakaretso - Ho bapisa Silicone PSA Kereiti le Tlhokahalo ea Thermal

• Silicone ea mofuta oa Methyl PSA (haholo-holo e phekotsoeng ka peroxide) e loketse feela tšebeliso ea nakoana kapa e tlaase ea mocheso. Ka mor'a matsatsi a 7 ho 250 ° C, lebella 30-50% tahlehelo ea lekhapetla le ho khoneha ho embrittlement.

• Methylphenyl (high-phenyl) silicone PSA e boloka> 85% matla a lekhapetla le bonngoe bo bonolo ka mor'a botsofali bo tšoanang. Ke khetho bakeng sa ts'ebeletso e tsoelang pele ea 200-250 ° C.

• Mokhoa oa ho kopanya o bohlokoa haholo: pheko ea tlatsetso (hydrosilylation) e tsitsitse ho feta pheko ea peroxide.

• Likarolo tse phahameng tsa peel li hula botsitso ba botsofali bakeng sa ts'ebetso ea pele - li qobe lits'ebetsong tse chesang.

Bakeng sa ho batla maqhama a mocheso o phahameng, Aokai PTFE e sebelisa methylphenyl silicone PSAs e phekotsoeng. Re ka fana ka lintlha tsa ho boloka lekhapetla kamora 1000h ho 250°C ka kopo.

Litaba tsa tekheniki tse fanoeng ke Jiangsu Aokai New Materials Technology Co., Ltd.

Bakeng sa lintlha tse qaqileng tsa li-database tsa tekheniki le tharollo ea tloaelo bakeng sa masela a mocheso o phahameng oa PTFE, litheipi, mabanta a marang-rang, le tse ling:

• Mong. Guo: +86 18944819998

• Mong. Liu: +86 13705266308

Ho latela boits'oaro le bots'epehi, re fana ka litharollo tse ikhethileng tsa sebaka se le seng le lits'ebeletso tse nahanang ka mor'a thekiso.