Xa a I-PTFE i-tape ye-adhesive high-temperature isetyenziswe kwindawo eshushu - ithi, i-200 ° C kwiiveki okanye iinyanga - i-adhesive ye-silicone yoxinzelelo-sensitive (PSA) inokutshintsha. Amandla e-Peel anokunyuka, awe, okanye atshintshe intsalela. Ukubambisana kunokunyuka (ukuqina) okanye ukuncipha (ukungaphumeleli kokubambisana).
Ayizizo zonke iiPSA ze-silicone eziziphatha ngendlela efanayo. Iiyantlukwano zehla kwi-polymer composition (methyl vs. methylphenyl), i-crosslinking mechanism (i-peroxide vs. unyango olongezelelweyo), kunye nomlinganiselo we-MQ resin kwi-rubber.
I-Aokai PTFE isebenzisa amabakala amaninzi e-silicone e-PSA kwiiteyiphu zethu. Esi sikhokelo sichaza ukuba kwenzeka ntoni na ukuxobula amandla kunye nomanyano emva kokuguga okuphakamileyo kwibakala ngalinye, kunye nendlela yokukhetha echanekileyo kwisicelo sakho.
Kwenzeka ntoni kwi-Silicone PSA phantsi kobushushu-iindlela ezimbini zokungaphumeleli
Xa umdala kwiqondo lokushisa eliphezulu (200-250 ° C), iiPSA ze-silicone zinokutshintsha ezimbini ezichaseneyo:
1. I-post-crosslinking (ikhokelela ekubeni brittleness)
Amaqela asebenzayo angasebenziyo aqhubeka esabela, ukwandisa ukuxinana kwe-crosslink. Amandla okuqala e-peel anokunyuka okwexeshana, emva koko awe kabukhali njengoko i-adhesive iqina kakhulu. Amandla okucheba okumileyo abonakala esonyuka, kodwa ukubamba amandla kunye noxhathiso lwempembelelo luyehla. Ifilimu yokunamathela iba nzima kwaye iqhekeke.
2. Ukuthotywa komqolo (kukhokelela ekulahlekeni kwamaxolo kunye nentsalela)
Umqolo we-polydimethylsiloxane uhamba nge-cyclization kunye ne-chain scission. Amandla e-Peel ehla ngokuqhubekayo. I-adhesive inokudlulisela kwi-substrate (intsalela) okanye ingaphumeleli ngokubambisana. Oku kuqhelekileyo kwi-low-grade methyl silicone PSAs.
Iiparamitha eziphambili zokumodareyitha:
Umxholo wePhenyl (uphezulu = ukumelana nobushushu obungcono)
Uxinaniso lweCrosslink kunye nodidi lokunyanga (unyango olongezelelweyo vs. unyango lweperoxide)
Umlinganiselo we-MQ resin ukuya kwirabha ye-silicone
Ukuhlelwa kweBanga ngokoLwakhiwo lweMichiza
1. I-polydimethylsiloxane eqhelekileyo (i-methyl-type silicone PSA)
Ukugcinwa kwe-Peel emva kokuguga (200-250 ° C): Amandla e-Peel akhuphuka kancane ekuqaleni, emva koko ayancipha. Emva kweentsuku ezi-7 kwi-250 ° C, ukugcinwa kwe-peel ku- 50-70% kuphela . Ukusebenza kwehla ngokukhawuleza kumaqondo obushushu aphezulu. Ukuthotywa kuvela kwibhayisikile yomqolo we-dimethyl siloxane.
Ukuzinza kokubambisana: Iinguqulelo ezihlanjululweyo ze-Peroxide (umzekelo, i-KR-101) zineziqalisi ezishiyekileyo ezibangela ukunyanzeliswa kwesithuba esingalawulwayo - i-adhesive ilukhuni kunye ne-embrittles. Amandla okuqala okucheba aphucula, kodwa ukubamba amandla ehla, kwaye ukungaphumeleli kokubambisana kwenzeka phantsi kobushushu. Iinguqulelo ezongezelelweyo-ezinyangwayo zingcono kancinane kodwa zisathintelwa kukunganyangeki kobushushu bendalo yomqolo we-dimethyl.
2. I-Methylphenyl polysiloxane (ibakala lokumelana nobushushu obuphezulu)
Ukugcinwa kwe-Peel emva kokuguga: I-Phenyl side chain iphazamisa ukupakishwa rhoqo kwamacandelo e-dimethyl kunye nokucinezela ukuthotywa kwe-cyclization. Emva kweentsuku ezi-7 kwi-250 ° C, ukugcinwa kwamandla e-peel kudlula i-85% . Ukuqulunqwa kwe-phenyl ephezulu kugcina iimpawu ezizinzileyo ze-peel nakwi-260-288 ° C.
Ukuzinza kokubambisana: Kugqwesileyo. Amandla okucheba atshintsha kancinci; ukubamba ugcino lwamandla ludlula i-80%. Uluhlu olunamathelisa luhlala luguquguquka ixesha elide ngaphandle kwe-embrittlement okanye intsalela. Amabanga aphezulu ephenyl adityanisiweyo yi-premium thermally stable silicone PSA.
3. Amabakala akhethekileyo akhethekileyo kunye ne-low-peel custom
Amanqanaba aphezulu e-peel (umzekelo, i-Dow 7385, i-peel eqhelekileyo> 10N / 25mm): Ukulayishwa kwe-resin ye-MQ ephezulu kunika i-tack yokuqala egqwesileyo kunye namandla e-peel, kodwa ngexabiso lokumelana nobushushu kunye nokuzinza kokubambisana. Zibonisa ukuhla kwe-peel enkulu emva kokuguga kwaye kulula ukuyishiya ngenxa yokubola kwe-resin eshushu. Sebenzisa kuphela usetyenziso lwethutyana lobushushu obuphantsi.
I-Low-peel, i-high-cohesion-high-cohesion yefilimu ifilimu ekhuselayo: Ubuninzi be-crosslink bunika ukusebenza okuzinzileyo kwe-peel kunye nokuzinza okugqwesileyo kokuguga, kodwa ukuthotywa kokuqala okuphantsi. Emva kokwaluphala, zihlala zibambene kodwa ziba lukhuni, zinciphisa ukuhambelana neendawo ezirhabaxa.
I-Crosslinking Mechanism-Peroxide vs. Unyango olongezelelweyo (Same Methyl Base)
Nokuba i-methyl polymer efanayo, indlela yokunyanga iyayitshintsha kakhulu indlela yokuziphatha yokwaluphala.
1. Iperoxide-yanyangwa (isizukulwana sokuqala esiqhelekileyo)
I-peroxide eseleyo ibangela ukungalawulwa kwe-post-crosslink ngexesha lokuguga okuphezulu.
Amandla e-peel spikes ekuqaleni, emva koko awela ngokukhawuleza.
Ukubambisana kunyuka okwethutyana, kulandelwa yi-embrittlement kunye nokubamba ukusilela kwamandla.
Ukuguga kwebhetshi ukuya kwibhetshi kumbi.
2. Ukongezwa-kunyangwa (hydrosilylation curing)
Unyango aluvelisi mveliso; inethiwekhi ye-crosslink iyalawuleka ngokuchanekileyo.
Utshintsho lwepropathi lwasemva kokuguga lulandela umkhondo womgca oqikelelwayo.
Ukugcinwa kwe-peel ephezulu kakhulu kunye nokuzinza kokubambisana xa kuthelekiswa nokwakheka kweperoxide.
IsiKhokelo sokuKhetha iBanga
Umqathango weNkonzo |
IBanga elicetyiswayo |
Ngoba |
Ukushisa okuphezulu okuqhubekayo (>200 ° C), i-peel ezinzileyo, i-residu ye-zero |
Ukongezwa-okunyanga, i-phenyl ephezulu (umzekelo, i-Dow 7388, i-Q2-7406) |
> i-85% yokugcinwa kwe-peel, akukho-embrittlement, > i-80% ibambe ukugcinwa kwamandla |
Ubushushu obuphezulu bexesha elifutshane, olungenaxabiso |
Udidi lwe-methyl oluqhelekileyo, olongezelelweyo-lunyangelwe, lunyangelwe emva kokubhaka (umz., 7657) |
Yamkelekile kodwa ilindele ukuthotywa kwexolo kunye nokuqina okunokwenzeka kwimijikelo emide |
Ixolo lokuqala liphezulu kakhulu elifunekayo, ubushushu obuphantsi kuphela |
Umgangatho ophezulu we-methyl |
Hayi ngenxa yobushushu obungapheliyo; lindela intsalela emva kokwaluphala |
Ifilimu ekhuselayo, ukubambisana okuphezulu, i-tack ephantsi |
Ibanga eliphantsi le-peel eliphantsi kwe-High-crosslink |
Uzinzo olugqwesileyo lokuguga kodwa lukhuni kwaye aluhambelani kangako |
Ingcebiso ye-Aokai PTFE : Kuyo nayiphi na iteyiphu ye-PTFE eya kubona amaqondo obushushu azinzileyo ngaphezulu kwe-200 ° C, cacisa i-adotio-curred methylphenyl silicone PSA. Iindleko zangaphambili ziphezulu, kodwa zithintela ukusilela kwintsimi okubangelwa yintsalela encamathelayo okanye ilahleko yebhondi.
IsiShwankathelo-Ukutshatisa iSilicone PSA iBanga ukuya kwiMfuno yeThermal
I-silicone yohlobo lwe-Methyl ye-PSA (ingakumbi i-peroxide-inyangekile) ifanelekile kuphela ukusetyenziswa kwexesha eliphakathi okanye eliphantsi lobushushu. Emva kweentsuku ze-7 kwi-250 ° C, lindela i-30-50% yokulahleka kwe-peel kunye ne-embrittlement enokwenzeka.
I-Methylphenyl (high-phenyl) i-silicone ye-PSA igcina> i-85% yamandla e-peel kunye nokubambisana okuguquguqukayo emva kokuguga okufanayo. Lukhetho lwenkonzo eqhubekayo ye-200-250 ° C.
Indlela yokudibanisa ibaluleke kakhulu: unyango olongezelelweyo (i-hydrosilylation) luzinze ngakumbi kunonyango lweperoxide.
Amabanga aphezulu athengisa ukuzinza kokuguga kwi-tack yokuqala - ziphephe kwizicelo ezishushu.
Kubanga i-high-temperature bonding, i-Aokai PTFE isebenzisa i-methylphenyl silicone PSAs eyongeziweyo. Sinokubonelela ngedatha yokugcina i-peel emva kwe-1000h kwi-250 ° C xa siceliwe.
Umxholo wobugcisa onikezelwe ngu I-Jiangsu Aokai yeZixhobo eziNtsha zeTekhnoloji Co., Ltd.
Ukufumana iinkcukacha zedatadata yobugcisa kunye nezisombululo zesiko le-PTFE amalaphu obushushu obuphezulu, iiteyiphu, amabhanti omnatha, kunye nokunye:
Ukubambelela kubuchwephesha kunye nemfezeko, sinikezela ngezisombululo ezilungelelanisiweyo zokuphela kunye kunye neenkonzo ezicingayo emva kokuthengisa.
