Silicone PSA Tom Qab Kub Kub Kub: Peel Strength thiab Cohesion los ntawm Qib

Thaum a PTFE high-temperature adhesive daim kab xev yog siv nyob rau hauv ib puag ncig kub - hais tias, 200 ° C rau lub lis piam los yog lub hlis - lub silicone siab-rhiab nplaum nplaum (PSA) yuav hloov. Peel zog yuav nce, poob, los yog hloov residue. Cohesion tuaj yeem nce ntxiv (brittleness) lossis txo qis (cohesive tsis ua haujlwm).

Tsis yog txhua tus silicone PSAs coj zoo ib yam. Qhov sib txawv los mus rau polymer muaj pes tsawg leeg (methyl vs. methylphenyl), crosslinking mechanism (peroxide vs. ntxiv kho), thiab qhov piv ntawm MQ resin rau roj hmab.

Aokai PTFE siv ntau qib silicone PSA hauv peb cov kab xev. Phau ntawv qhia no piav qhia txog dab tsi tshwm sim rau tev lub zog thiab kev sib koom ua ke tom qab kev laus kub siab rau txhua qib, thiab yuav ua li cas xaiv qhov zoo rau koj daim ntawv thov.

Dab tsi tshwm sim rau Silicone PSA Thaum tshav kub kub - Ob hom kev ua tsis tiav

Thaum muaj hnub nyoog ntawm qhov kub siab (200-250 ° C), silicone PSAs tuaj yeem dhau los ua ob qhov kev hloov pauv:

1. Post-crosslinking (ua rau brittleness)

Cov pab pawg ua haujlwm tsis muaj kev cuam tshuam txuas ntxiv ua rau muaj kev cuam tshuam, nce crosslink ceev. Thawj tev lub zog tuaj yeem nce ib ntus, tom qab ntawd poob qis vim tias cov nplaum ua nruj dhau. Static shear lub zog zoo li nce, tab sis tuav lub zog thiab cuam tshuam tsis zoo. Cov nplaum zaj duab xis yuav nyuaj thiab tawg.

2. Cov pob txha degradation (ua rau tev poob thiab seem)

Cov pob txha polydimethylsiloxane tau dhau los ua cyclization thiab saw saw. Peel zog poob tsis tu ncua. Cov nplaum yuav hloov mus rau lub substrate (residue) los yog ua tsis tau zoo. Qhov no tshwm sim hauv qib qis methyl silicone PSAs.

Qhov tseem ceeb modulating parameter:

• Phenyl cov ntsiab lus (ntau dua = zoo dua kub tsis kam)

• Crosslink ceev thiab kho hom (kev kho ntxiv thiab kho peroxide)

• Qhov piv ntawm MQ cob rau silicone roj hmab

Qib kev faib tawm los ntawm Chemical Structure

1. Txheem polydimethylsiloxane (methyl-type silicone PSA)

• Peel tuav tom qab kev laus (200-250 ° C): Peel zog nce me ntsis thaum xub thawj, ces poob. Tom qab 7 hnub ntawm 250 ° C, tev tawm tsuas yog 50-70% . Kev ua tau zoo poob sai dua ntawm qhov kub siab dua. Degradation los ntawm cyclization ntawm dimethyl siloxane qaum.

• Cohesion stability: Peroxide-kho versions (piv txwv li, KR-101) muaj cov residual pib pib ua rau uncontrolled tom qab kho - nplaum hardens thiab embrittles. Thaum pib shear zog txhim kho, tab sis tuav lub hwj chim poob, thiab cohesive tsis ua hauj lwm tshwm sim nyob rau hauv tshav kub. Ntxiv-kho versions yog me ntsis zoo dua tab sis tseem txwv los ntawm qhov tsis zoo ntawm cov cua sov tsis zoo ntawm cov pob txha dimethyl.

2. Methylphenyl polysiloxane (siab kub resistant qib)

• Peel tuav tom qab kev laus: Phenyl sab chains cuam tshuam qhov ntim ntawm dimethyl ntu thiab txo qis cyclization degradation. Tom qab 7 hnub ntawm 250 ° C, tev lub zog tuav ntau tshaj 85% . High-phenyl formulations tswj cov tawv nqaij ruaj khov txawm tias ntawm 260-288 ° C.

• Cohesion stability: Zoo heev. Shear zog hloov tsawg heev; tuav lub zog tuav ntau tshaj 80%. Cov nplaum txheej tseem hloov tau mus ntev yam tsis muaj embrittlement lossis residue. Ntxiv-kho cov qib high-phenyl yog cov hwm zoo thermally ruaj khov silicone PSA.

3. Tshwj xeeb high-peel thiab low-peel kev cai qib

• High-peel qib (piv txwv li, Dow 7385, raug tev> 10N / 25mm): High MQ resin loading muab zoo heev pib tack thiab tev lub zog, tab sis ntawm tus nqi ntawm tshav kub kuj thiab cohesion stability. Lawv pom cov tev loj dua tom qab kev laus thiab muaj feem cuam tshuam vim resin thermal decomposition. Siv tsuas yog rau cov ntawv thov kub qis qis.

• Low-peel, high-cohesion tiv thaiv zaj duab xis qib: High crosslink density muab tev kev ua haujlwm ruaj khov thiab kev laus kev ruaj ntseg zoo, tab sis qis pib tack. Tom qab aging, lawv nyob cohesive tab sis ua hardened, txo conformability rau ntxhib nto.

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

Txawm tias muaj tib yam methyl polymer, txoj kev kho kom zoo hloov pauv kev laus tus cwj pwm.

1. Peroxide-kho (paub thaum ntxov)

• Residual peroxide ua rau tsis muaj kev tswj xyuas tom qab kev sib tsoo thaum lub sijhawm kub kub.

• Peel zog spikes pib, ces collapses sharply.

• Cohesion nce ib ntus, tom qab ntawd los ntawm embrittlement thiab tuav lub zog tsis ua haujlwm.

• Batch-rau-batch aging sib xws yog tsis zoo.

2. Ntxiv-kho (hydrosilylation curing)

• Kho generates tsis muaj byproducts; crosslink network yog precisely controllable.

• Cov cuab yeej tom qab kev laus hloov pauv ua raws li kev kwv yees kab sib txawv.

• Zoo tshaj tev khaws cia thiab cohesion stability piv rau peroxide formulations.

Kev Taw Qhia Qib

Aokai PTFE kev pom zoo : Rau ib qho PTFE daim kab xev uas yuav pom qhov kub siab tshaj 200 ° C, qhia ib qho ntxiv-kho methylphenyl silicone PSA. Tus nqi pem hauv ntej yog siab dua, tab sis nws tiv thaiv kev ua tsis tiav los ntawm cov nplaum residue lossis daim ntawv cog lus poob.

Summary - Sib piv Silicone PSA Qib rau Thermal Demand

• Methyl-type silicone PSA (tshwj xeeb tshaj yog peroxide-kho) tsuas yog siv rau kev siv tsis sib xws lossis kub qis. Tom qab 7 hnub ntawm 250 ° C, cia siab tias 30-50% tev poob thiab ua tau embrittlement.

• Methylphenyl (high-phenyl) silicone PSA khaws> 85% tev lub zog thiab hloov tau yooj yim cohesion tom qab kev laus tib yam. Nws yog qhov kev xaiv rau kev pabcuam txuas mus ntxiv 200-250 ° C.

• Crosslinking mechanism tseem ceeb heev: kev kho ntxiv (hydrosilylation) yog qhov ruaj khov dua li kev kho peroxide.

• Cov qib high-peel pauv tawm kev laus kev ruaj ntseg rau thawj zaug tack - zam lawv hauv cov ntawv thov kub.

Rau qhov xav tau kev sib txuas ntawm qhov kub thiab txias, Aokai PTFE siv ntxiv-kho methylphenyl silicone PSAs. Peb tuaj yeem muab cov ntaub ntawv khaws cia tom qab 1000h ntawm 250 ° C thaum thov.

Cov ntsiab lus technical muab los ntawm Jiangsu Aokai Tshiab Materials Technology Co., Ltd.

Rau cov ncauj lus kom ntxaws cov ntaub ntawv thiab cov kev cai daws teeb meem rau PTFE high-temperature fabrics, tapes, mesh siv, thiab ntau dua:

• Mr. Guo: +86 18944819998

• Mr. Liu: +86 13705266308

Ua raws li kev tshaj lij thiab kev ncaj ncees, peb muab ib qho kev daws teeb meem thiab kev xav zoo tom qab muag.