Silicone PSA Oluvannyuma lw’okukaddiwa mu bbugumu erya waggulu: Amaanyi g’ebikuta n’okukwatagana okusinziira ku ddaala

Bwe a PTFE high-temperature adhesive tape ekozesebwa mu mbeera eyokya – tugambe, 200°C okumala wiiki oba emyezi – silicone pressure-sensitive adhesive (PSA) esobola okukyuka. Amaanyi g’ebikuta gayinza okulinnya, okugwa oba okukyusa ebisigadde. Okukwatagana kuyinza okweyongera (okumenyaamenya) oba okukendeera (okulemererwa kw’okukwatagana).

Silicone PSA zonna tezeeyisa kye kimu. Enjawulo zijja wansi ku butonde bwa polimeeri (methyl vs. methylphenyl), enkola y’okusalasala (peroxide vs. addition cure), n’omugerageranyo gwa MQ resin ne rubber.

Aokai PTFE ekozesa ebika bya silicone PSA ebingi mu butambi bwaffe. Ekitabo kino kinnyonnyola ekituuka ku maanyi g’ebikuta n’okukwatagana oluvannyuma lw’okukaddiwa mu bbugumu eringi ku buli ddaala, n’engeri y’okulondamu ekituufu eky’okukozesa kwo.

Ekituuka ku Silicone PSA Wansi w’ebbugumu – Emitendera ebiri egy’okulemererwa

Bwe zikaddiwa ku bbugumu erya waggulu (200-250°C), silikoni PSA zisobola okuyita mu nkyukakyuka bbiri ezikontana:

1. Post-crosslinking (kiviirako okumenyaamenya) .

Ebibinja by’emirimu ebitali bikwatagana bigenda mu maaso n’okukola, ne byongera ku density y’okusalasala. Amaanyi g’okusekula mu kusooka gayinza okulinnya okumala akaseera, olwo ne gagwa nnyo ng’ekyesiiga kikaluba nnyo. Amaanyi g’okusala (static shear strength) galabika nga geeyongera, naye amaanyi g’okukwata n’okuziyiza okukuba byonooneka. Firimu eyeesiiga efuuka nkalu era n’eyatika.

2. Okuvunda kw’omugongo (kiviirako okufiirwa ebikuta n’ebisigadde) .

Omugongo gwa polydimethylsiloxane guyita mu cyclization ne chain scission. Amaanyi g’okusekula gakendeera buli kiseera. Ekisiiga kiyinza okukyusa okudda ku substrate (residue) oba okulemererwa okukwatagana. Kino kitera okubaawo mu PSA za methyl silicone ez’omutindo ogwa wansi.

Ebikulu ebipima okukyusakyusa:

• Ebirimu phenyl (ebisingako = okugumira ebbugumu okulungi) .

• Crosslink density n’ekika ky’okuwonya (okuwonya okw’okwongerako vs. okuwonya kwa perokisayidi) .

• Omugerageranyo gwa MQ resin ne silicone rubber

Ensengeka y’ebika okusinziira ku nsengeka y’eddagala

1. Polydimethylsiloxane eya mutindo (silikoni ey’ekika kya methyl PSA) .

• Okusigala kw’ebikuta oluvannyuma lw’okukaddiwa (200-250°C): Amaanyi g’ebikuta gasooka kulinnya katono, oluvannyuma ne gakendeera. Oluvannyuma lw’ennaku 7 ku 250°C, okusigala kw’ebikuta kuba 50-70% zokka . Omulimu gukendeera mangu ku bbugumu erya waggulu. Okuvunda kuva mu cyclization y’omugongo gwa dimethyl siloxane.

• Okutebenkera kw’okukwatagana: Enkyusa eziwonye peroxide (okugeza, KR-101) zirina ebitandisi ebisigadde ebivaako okuwona oluvannyuma lw’okuwonya okutafugibwa – adhesive ekaluba n’okumenya. Amaanyi g’okusala agasooka gatereera, naye amaanyi g’okukwata gakendeera, era okulemererwa kw’okukwatagana kubaawo wansi w’ebbugumu. Enkyusa eziwonyezebwa mu kwongerako zisingako katono naye nga zikyalina ekkomo olw’obutaziyiza ebbugumu obuzaaliranwa obw’omugongo gwa dimethyl.

2. Methylphenyl polysiloxane (eddaala erigumira ebbugumu eringi) .

• Okusigala kw’ebikuta oluvannyuma lw’okukaddiwa: Enjegere z’ebbali za phenyl zitaataaganya okupakinga okwa bulijjo okw’ebitundu bya dimethyl era zinyigiriza okuvunda kwa cyclization. Oluvannyuma lw’ennaku 7 ku 250°C, okusigala kw’amaanyi g’ebikuta kusukka ebitundu 85% . Ebirungo ebirimu phenyl omungi bikuuma eby’obugagga by’ebikuta ebinywevu ne ku 260-288°C.

• Okutebenkera kw’okukwatagana: Kirungi nnyo. Amaanyi g’okusala gakyuka kitono; okukuuma amaanyi okusigala kusukka 80%. Oluwuzi olusiiga lusigala nga lugonvu okumala ebbanga eddene nga tezifuuse bbugumu oba ebisigadde. Ebika bya phenyl ebingi ebiwonyezebwa mu kugattako bye bikozesebwa mu kukola silicone PSA eby’omutindo ogwa waggulu ebinywevu mu bbugumu.

3. Eddaala ery’enjawulo erya custom eriko ebikuta ebinene n’ebisekula ebitono

• Ebika by’okusekula ebinene (okugeza, Dow 7385, ebikuta ebya bulijjo >10N/25mm): Okutikka resin eya MQ enkulu kiwa tack esooka ennungi ennyo n’amaanyi g’okusekula, naye ku muwendo gw’okuziyiza ebbugumu n’okunyweza okukwatagana. Ziraga okutonnya kw’ebikuta okunene oluvannyuma lw’okukaddiwa era zitera okubeera n’ebisigadde olw’okuvunda kw’ebbugumu lya resini. Kozesa ku mirimu gyokka egy’ebbugumu eri wansi egy’ekiseera ekigere.

• Low-peel, high-cohesion protective film grades: High crosslink density egaba stable peel performance n'okukaddiwa okunywevu okulungi, naye low initial tack. Oluvannyuma lw’okukaddiwa, zisigala nga zikwatagana naye nga zikaluba, ekikendeeza ku kukwatagana n’ebintu ebikalu.

Enkola y’okuyunga – Peroxide vs. Okuwonya kw’okugatta (Same Methyl Base) .

Ne bwe kiba nga kirimu methyl polymer y’emu, enkola y’okuwonya ekyusa nnyo enneeyisa y’okukaddiwa.

1. Peroxide-cured (omulembe ogw’olubereberye ogwa bulijjo) .

• Peroxide esigaddewo ereeta okuyungibwa okw’oluvannyuma okutafugibwa mu kiseera ky’okukaddiwa okw’ebbugumu eringi.

• Amaanyi g’okusekula gasituka mu kusooka, oluvannyuma ne gagwa nnyo.

• Okukwatagana kulinnya okumala akaseera, ne kugobererwa okumenyamenya n’okugwa kw’amasannyalaze.

• Obukwatagana bw’okukaddiwa okuva ku kibinja ku kibinja bubi.

2. Okuwonyezebwa mu kwongerako (okuwonyezebwa mu hydrosilylation) .

• Cure tevaamu bivaamu byonna; crosslink network efugibwa ddala.

• Enkyukakyuka z’ebintu oluvannyuma lw’okukaddiwa zigoberera enkola ya linear eteeberezebwa.

• Far superior peel retention n’okunyweza okukwatagana bw’ogeraageranya n’enkola za peroxide.

Obulagirizi bw’okulonda ekibiina

Aokai PTFE recommendation : Ku ttaapu yonna eya PTFE ejja okulaba ebbugumu eriwangaala erisukka 200°C, laga methylphenyl silicone PSA ewonyezeddwa mu kwongerako. Ensimbi ezisaasaanyizibwa mu maaso zisingako, naye zitangira okulemererwa kw’ennimiro okuva ku bisigalira by’okusiiga oba okufiirwa kwa bond.

Mu bufunze – Okukwataganya Silicone PSA Grade n’obwetaavu bw’ebbugumu

• Methyl-type silicone PSA (naddala peroxide-cured) esaanira okukozesebwa mu biseera ebitali bimu oba ku bbugumu eritono lyokka. Oluvannyuma lw’ennaku 7 ku 250°C, subira okufiirwa ebikuta ebitundu 30-50% n’okumenyamenya okuyinza okubaawo.

• Methylphenyl (high-phenyl) silicone PSA ekuuma amaanyi g’ebikuta >85% n’okukwatagana okukyukakyuka oluvannyuma lw’okukaddiwa kwe kumu. Ye nkola y’okulonda okuweereza obutasalako ku 200-250°C.

• Enkola y’okuyunga (crosslinking mechanism) nsonga nkulu nnyo: okuwonya okw’okugatta (hydrosilylation) kunywevu nnyo okusinga okuwonya kwa perokisayidi.

• Ebika ebiyitibwa high-peel grades bisuubula off aging stability for initial tack – byewale mu kukozesa okwokya.

Ku lw’okusaba okukwatagana okw’ebbugumu eringi, Aokai PTFE ekozesa PSAs za methylphenyl silicone eziwonye mu kwongerako. Tusobola okuwa data y’okukuuma ebikuta oluvannyuma lwa 1000h ku 250°C nga tusabye.

Ebirimu eby’ekikugu ebiweereddwa... Jiangsu Aokai Ebintu Ebipya Tekinologiya Co., Ltd.

Okufuna datasheets ez’ekikugu ezikwata ku nsonga n’okugonjoola ebizibu eby’enjawulo ku PTFE emifaliso egy’ebbugumu eringi, obutambi, emisipi egy’akatimba, n’ebirala:

• Mwami Guo: +86 18944819998 ye

• Mwami Liu: +86 13705266308 ye

Nga tunywerera ku bukugu n’obwesimbu, tuwa eby’okugonjoola ebirongooseddwa mu kifo kimu n’obuweereza obulowoozebwako oluvannyuma lw’okutunda.