Wannan labarin ya shafi yadda za a dace shafi na'ura line gudun da tanda tsawon don tabbatar organosilicone m kai manufa curing digiri ga high-zazzabi PTFE tef. Ƙa'idar da ta dace da mahimmanci: jimlar lokacin zama t_total = ingantaccen tsawon tanda L ÷ saurin layin v dole ne ya zama ƙasa da mafi ƙarancin lokacin magani. Sami halayen magani ta hanyar DSC ko gwaje-gwajen warkarwa na manne da ke kafa dangantaka 'zazzabi - mafi ƙarancin lokacin magani'. Daidaitaccen samfurin magani: raba tanda zuwa yankuna, ƙididdige ti=Li/v da tcure(Ti), tabbatar ∑(ti/tcure(Ti)) ≥1. Hanyoyin ƙididdiga: saita yankunan zafin jiki tare da tsayin Li da yanayin zafi Ti; saita saurin layi v, ƙididdige lokacin zaman kowane yanki da rabon gudummawa; sake maimaita har zuwa jimlar ≥1 (shawarar iyakar tsaro 1.1-1.2).

Wannan labarin ya kwatanta bambance-bambance tsakanin infrared radiation dumama da zafi-iska wurare dabam dabam dumama curing hanyoyin a crosslinked tsarin uniformity na silicone m yadudduka. Hanyoyin canja wuri mai zafi: iska mai zafi yana dogara ga convection-convection tare da zafin jiki mai laushi, ƙananan ƙananan zafin jiki na ciki / waje; IR yana da ƙayyadaddun zurfin shigar ciki tare da ƙaƙƙarfan shayar da ƙasa (dubun zuwa ɗaruruwan micrometers) ƙirƙirar gradient mai zurfi-zuwa-ciki. Tasiri kan daidaituwar haɗin kai: iska mai zafi yana ba da damar yin aiki tare tare da ciki da waje tare da madaidaicin haɗin giciye; IR yana haifar da shimfidar shimfidar wuri don samar da fim mai yawa 'fim ɗin fata' da sauri wanda ke hana tafiyar da zafi da motsin sarkar ciki, yana haifar da ƙarancin haɗin kai yana raguwa daga saman zuwa ciki.

Wannan labarin ya ƙunshi adadin wasiƙun da ke tsakanin juzu'in gel da ƙarfin haɗin gwiwa a cikin mannen matsi na silicone don teflon teflon. Gel Juzu'i = yawan adadin cibiyar sadarwar da ba za a iya narkewa a cikin toluene (hakar Soxhlet, 24hr). Ƙarfin haɗin gwiwa wanda ke da ƙarfin riƙe da zafin jiki mai zafi (180 ° C, 1kg). Rarraba uku: ƙasa mai mahimmanci (<60%) - babu hanyar sadarwa mai ruɗi, riƙe iko kusa da sifili; kewayo mai amfani (60-85%) - ƙarfin haɗin gwiwa yana girma da ƙarfi tare da juzu'in gel, 60% → 70% yana haɓaka lokacin riƙewa daga mintuna zuwa sa'o'i, 70% → 80% yana ba da haɓaka 3-10x; high crosslinking (> 85%) - samun jinkirin (85% → 95% kawai 20-50% karuwa), tack ya ragu sosai,> 95% ya rasa kaddarorin PSA.

Wannan labarin ya ƙunshi yadda za a daidaita zafin jiki na bazuwar da rabin rayuwar peroxide crosslinking agents (BPO da DCP) tare da taga aikin warkewa don Teflon tef. Bayanan mahimmanci: BPO - 1-min rabin rayuwa a ~ 131 ° C, 1-hr a ~ 92 ° C, 10-hr a ~ 72 ° C; DCP - 1-min a ~171°C, 1-hr a ~135°C, 1-hr a ~115°C. Matukar ma'anar: manne yana buƙatar 97-99% crosslinking = 5-7 rabi-rayu; lokacin warkewa = 5-7 × rabin rayuwa a zafin da aka yi niyya. Ƙirar baya-ƙididdigar zafin jiki daga lokacin zama na layin samarwa ko ƙididdige lokacin baya daga matsakaicin zafin zafin da aka yarda.

Wannan labarin ya kwatanta bambance-bambance tsakanin infrared radiation dumama da zafi-iska wurare dabam dabam dumama a crosslinked tsarin uniformity na silicone m Layer. Hanyoyin canja wurin zafi: iska mai zafi shine convection-convection, m da ci gaba, samar da matsakaicin zafin jiki; IR shine radiyo-sha tare da matsanancin shayar da ƙasa (micrometers zuwa millimeters) yana ƙirƙirar gradient mai zurfi-zuwa ciki. Tasiri kan rarraba giciye mai yawa: iska mai zafi yana ba da damar ɓangarori na ciki da na waje su shiga kewayon zafin jiki na vulcanization kusan lokaci guda, suna samar da nau'in haɗin giciye tare da kauri; IR yana haifar da shimfidar shimfidar wuri don warke nan take da ke haifar da fata mai yawa wanda ke hana canja wurin zafi, wanda ke haifar da ƙwaƙƙwaran ƙaƙƙarfan ɗigon giciye yana raguwa daga saman ciki.

Wannan labarin yayi nazari akan tasirin sarrafa tashin hankali na yanar gizo yayin rufin teflon mai zafi mai zafi akan PTFE substrate flatness da manne shafi uniformity. Tasiri kan flatness na substrate: tashin hankali wuce iyaka na roba yana haifar da shimfidar filastik da ba za a iya jurewa ba (tsawon tsayin tsayi, kunkuntar juzu'i), haifar da slackness, wrinkles da alamu wavy; PTFE creep a karkashin ci gaba tashin hankali ya zama 'daskararre' bayan sanyaya, haifar da rashin daidaito a saman; Rashin daidaituwar tashin hankali daga rashin daidaiton abin nadi yana haifar da dunƙule gefuna, kumburin tsakiya, da matsi-sako da alamun lokaci-lokaci.

Wannan labarin ya bayyana yanayin canji a cikin ƙarfin haɗin gwiwa na PTFE babban zafin jiki na tef ɗin mannewa bayan babban zafin jiki. Tsarin matakai uku: Matakin tasowa bayan warkewa (farkon yanayin zafi mai zafi a 200-260 ° C, ƙungiyoyin da suka rage suna ci gaba da ƙetare, haɗin kai yana ƙaruwa sosai); Matakan daidaita daidaito (hanyoyin haɗin kai sun ƙare, haɗin kai ya kasance karko na dogon lokaci); Lalacewa da raguwar mataki (yawan lokaci/zazzabi yana haifar da lalacewar sarkar babba, haɗin kai yana raguwa, manne yana laushi kuma ya zama tacky). Abubuwan da ke haifar da gazawar haɗin gwiwa (tsagewar ciki ta bar ragowar) da matsi (sanyi ya kwarara daga gefuna saboda raguwar modul).

Wannan labarin yana gabatar da hanyoyin da za a inganta juriya mai raɗaɗi da kwanciyar hankali na dogon lokaci na babban tef ɗin zafi mai zafi na Teflon. Dabarun sun haɗa da: Ƙwararrun hanyoyin sadarwa na kwayoyin halitta - babban MQ resin/gum rabo na MQ (1.2:1-2:1) yana samar da yankuna masu wuyar gaske; haɗa ƙungiyoyin phenyl (20-30 mol%) yana hana motsin sarkar; crosslink nauyi mai sarrafa kansa a 5,000-15,000 g / mol; Gradient modules multilayer m tsarin - primer-anchoring Layer (1-3μm) tare da silane hada guda biyu wakili, high-modulus cohesive Layer (30-50μm) a matsayin karfi-resistant kwarangwal, viscoelastic aiki Layer (3-8μm) ga surface wetting; Nanofillers - silica fumed (10-25 wt%) tare da gyare-gyaren saman yana haifar da jujjuyawar haɗin kai ta jiki.

Wannan labarin yana magana ne akan yadda ƙirar ƙirar ƙirar ƙirar Teflon mai zafi (PTFE) mai zafi mai zafi ta daidaita yanayin iska tare da rufi da kaddarorin da ba na sanda ba. Rikici mai mahimmanci: iyawar iska yana buƙatar buɗaɗɗen pores, yayin da rufi yana buƙatar yawa kuma rashin sanda yana buƙatar filaye masu santsi. Madaidaitan dabarun ƙira: sarrafa matsakaicin diamita na pore (0.1-2μm, da kyau <0.5μm) don hana narkewar shiga da kuma kula da ƙarancin wutar lantarki; sarrafa porosity a 50-70% (≈60% mafi kyau duka) cimma Gurley 20-100s / 100cc da ƙarfin dielectric ≥2kV don fim ɗin 0.13mm; Ɗauki tsarin pore na cibiyar sadarwar 3D mai girma-tortuosity (τ≈2.5-4) don murkushe tashoshi masu fitarwa kai tsaye; gina asymmetric gradient pore tsarin tare da m surface fata Layer (1-5μm) ga maras sanda / rufi da porous ciki don breathability; shafa super-oleophobic/hydrophobic saman bayan jiyya ba tare da toshewar pore ba.

Wannan labarin yana ba da mafita na tsari don hana ragowar mannewa da zubar jini lokacin amfani da tef mai zafi mai zafi na PTFE don kare yatsun gwal na PCB yayin taron SMT. Tushen bincike na tushen: ragowar yana faruwa daga gazawar haɗin gwiwa ko canja wuri na fuska; zubar jini yana fitowa daga digon danko da mannewa ambaliya karkashin zafi mai sake kwarara. Maganin mahimmanci shine zaɓin tef ɗin da ya dace: silicone PSA tare da ɗan gajeren lokaci ganiya ≥300 ° C, ci gaba da ≥260 ° C, jimlar kauri 0.08-0.13mm tare da bakin ciki high-cohesion m yadudduka, da anti-bleed / saura-free takardar shaida. Gudanar da matakai guda shida: tsaftacewa na farko tare da IPA; lamination na sifili tare da cikakken fitar da iska; ingantaccen bayanin yanayin sake kwarara tare da dumama mai laushi (<2°C/s); bawon sanyi a ƙasa 50 ° C a kusurwar 180 °; aiki nan da nan a cikin sa'o'i 24 da amfani guda ɗaya kawai; sarrafa gazawar tare da gogewar IPA da duban girman girman 40-50x. Don PCBs masu gefe biyu, maye gurbin da sabon tef kafin sarrafa gefe na biyu.