Imiphumela Yokuswakama Kwezemvelo ku-PTFE Emulsion Impregnation

Enqubweni yangempela yokukhiqiza ye-PTFE indwangu esezingeni eliphezulu ye-Jiangsu Aokai New Materials, umswakama wemvelo uvamise ukulawulwa ngaphakathi kwebanga elithile lika- 40%–60% RH , kuhlanganiswe nokulawulwa kwezinga lokushisa. Izinga lokuhwamuka liyalungiswa ukuze libe ngaphansi kancane kunezinga lokuthuthwa kwe-capillary lamanzi ku-emulsion ngaphakathi kwenethiwekhi ye-capillary, iqinisekisa ukungena okugcwele kanye nokulingana kwe-emulsion ngenkathi ifinyelela amafilimu angenasici, aminyene kakhulu e-PTFE sintered.

Umthelela oyinhloko womswakamo wemvelo ku-PTFE emulsion impregnation ilele kubhalansi eguquguqukayo phakathi kwezinga lokuhwamuka kwamanzi kanye nokuzinza kwe-emulsion. I-PTFE emulsion ngokuvamile iwuketshezi olungeyona i-Newtonian olwakhiwa izinhlayiya zenhlaka ye-PTFE (isigaba esihlakaziwe), ama-surfactants, iziqinisi, namanzi (isigaba esiqhubekayo). Njengepharamitha yezemvelo, umswakamo ulawula i-volatilization kinetics of the solvent (amanzi), okunikeza imiphumela eyisisekelo ngale ndlela elandelayo:

1. Imithelela Eyisisekelo Kwinqubo Yokukhulelwa

Isiteji sokukhulelwa sidinga ukuthi i-emulsion ingene ngokuphumelelayo kuma-pores noma izikhala ze-fiber ze-substrate (isb., indwangu ye-glass fiber, i-mesh yensimbi).

Indawo yomswakamo ophansi : Amanzi ahwamuka ngokushesha, okwenza i-emulsion 'yome ngaphezulu' ngokushesha ku-substrate. Lokhu kukhulisa kakhulu i-viscosity esobala ye-emulsion esixhumi esibonakalayo, kuvimbela ukungena kwe-capillary yezinhlayiya ze-resin ku-substrate ejulile futhi kubangele 'ukungena okwanele' - okungukuthi, amaphakethe omoya ayinsalela ngaphakathi kwe-substrate. Ngaleso sikhathi, ukuhwamuka okusheshayo kususa inani elikhulu lokushisa, okungabangela ukwehla kwezinga lokushisa lasendaweni kungazelelwe, kuphazamise i-emulsion thermodynamically futhi kubangele imvula engaphezulu, okuholela 'ekhasini lewolintshi' noma ukujiya okungalingani kungqimba olufakiwe.

Indawo enomswakama ophezulu : Ukuhwamuka kwamanzi kuyavinjelwa, futhi i-emulsion ihlala esimweni esimanzi esine-viscosity ephansi ku-substrate isikhathi eside kakhulu. Kuma-substrates aqondile noma athambekele, ukuwohloka kwenzeka kalula ngaphansi kwamandla adonsela phansi; kuma-substrate ane-hygroscopic kakhulu, umswakama ophezulu ungase uvimbele ukuchithwa kwegesi ngaphakathi kwe-substrate, kwakhe amabhamuza amancane akhula abe amaphutha emigodini ngesikhathi sokucwiliswa okulandelayo.

2. Imithelela Eyisisekelo Kwikhwalithi Yokugcina Yokwenza Amafilimu

Ukwakhiwa kwefilimu ye-PTFE ngokuvamile kuhilela izigaba ezimbili: ukomisa (ukususwa kwamanzi) kanye nokushiswa kwezinga lokushisa eliphezulu (ukuncibilika kwezinhlayiyana). Umswakamo uthinta kakhulu ukwakheka komzimba oluhlaza ngesikhathi somiswa, 'okuzuzwa njengefa' efilimini yokugcina ye-sintered.

Ukuqhekeka nokucindezeleka kwangaphakathi : Ukwakheka kwefilimu yezinhlayiya zenhlaka ye-PTFE kuncike kumfutho we-capillary ngesikhathi sokuhwamuka kwamanzi ukuze ucindezele izinhlayiya zibe ungqimba oluminyene olugcwele. Umswakama ophansi kakhulu udala ukwanda okubukhali kwe-capillary pressure gradient kanye nokuncipha kokoma ngokushesha okukhulu, okudala ingcindezi enkulu yangaphakathi emzimbeni oluhlaza. Njengoba i-PTFE ingenalo ikhono lokuziphilisa ngaphambi kokucwilisa, ukucindezeleka okunjalo kuholela ngokuqondile kuma-microcracks noma ukuqhekeka okukhulu emzimbeni oluhlaza. Le mifantu ayikwazi ukuqedwa ngemva kokucwiliswa, okuholela ekuvuzeni kwefilimu noma ukunciphisa amandla emishini.

Ukufuduka kwe-surfactant nezinsalela : Ama-surfactants (njengezinye izindlela ze-perfluorooctanoic acid) eziqukethwe kuma-emulsions we-PTFE wezohwebo ahamba nokuhwamuka kwamanzi ngesikhathi somiswa. Indawo enomswakamo ophezulu inweba iwindi lokomisa, okuvumela isikhathi esanele sokuthi ama-surfactants anqwabelene phezulu, enze 'i-surface oil slick' noma isikhumba esiqinile. Uma lesi sendlalelo singaboli ngokuphelele noma siguquguquke ekuqaleni kwesigaba se-sintering, sizokwenziwa ngekhabhoni futhi simbozwe ngaphakathi kwefilimu, kubangele ukuphuzi, ukuminyana okuncishisiwe, futhi kube buthaka kakhulu ukunamathela phakathi kwe-PTFE ne-substrate (i-bonding embi ebusweni ngenxa yokuhlukaniswa okungcolile).

Ukuminyana kwefilimu kanye ne-porosity : Ifilimu ye-PTFE ekahle kufanele ingabi nembobo futhi iminyene. Ukulawulwa komswakama okungafanele okuholela ekuswakekeni okuyinsalela kuyingozi enkulu. Ngaphansi komswakamo ophezulu, uma amanzi engasuswanga ngokuphelele ngesikhathi sokushisisa nokomisa, umswakama oyinsalela uyahwamuka ngokushesha phakathi nokushiswa okulandelayo (okungaba ngu-327–400°C) ngokunwetshwa okunamandla kwevolumu, kudala ama-blowholes noma amabhamuza ahlanganayo efilimini encibilike kancane. Ngokuphambene, ngaphansi komswakamo ophansi kakhulu, ukomiswa ngokushesha kwendawo kwakha isikhumba esivalekile esivimba ukuhwamuka kwamanzi kwangaphakathi, kuphinde kubangele amabhamuza noma ukubola ngesikhathi sokucwilisa ngenxa yokucindezela komhwamuko onqwabelene.

Empeleni, umthelela womswakamo wendawo ekucubungulweni kwe-emulsion ye-PTFE empeleni uwukungenelela ku-kinetics yokuhwamuka kwamanzi:

·  Umswakama ophansi (ukoma ngokweqile)  uvame ukubangela: ukungangeni kahle, ukuvimbeka kokulinganisa (imigodi eshwabene), imifantu yokomisa, nokusatshalaliswa ngokungalingani kwezinsalela ze-surfactant.

·  Umswakama ophezulu (umswakama owedlulele)  uvame ukubangela: ukuwohloka, ukukhuphuka kwezimbobo zezikhonkwane, ukuntanta kwe-surfactant ngokweqile, amabhamuza ngemva kokucwila, nokuncipha kokunamathela.

Ulwazi olungenhla lunikezwe i- Jiangsu Aokai New Materials Technology Co., Ltd.

Ukuze uthole imingcele enemininingwane, izimo zohlelo lokusebenza nezixazululo ezenziwe ngokwezifiso zohlu lwethu oluphelele lomkhiqizo, okuhlanganisa indwangu ye-PTFE ephezulu lokushisa, i-PTFE itheyiphu yokushisa ephezulu, ibhande le-PTFE elinezinga eliphezulu lokushisa, amabhande angenamthungo acwebezelayo, indwangu ye-PTFE enohlangothi olulodwa, ibhande elivikela izinga lokushisa eliphezulu, ingilazi ye-fiber resistant, njll.

·  Inombolo Yezinkonzo: Mnu. Guo 18944819998

·  UMnu Liu 13705266308

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