Iimpembelelo zokufuma kokusiNgqongileyo kwi-PTFE Emulsion Impregnation

Kweyona nkqubo yokuvelisa i-PTFE i-high-temperature cloth yi-Jiangsu Aokai New Materials, ukufuma okusingqongileyo ngokuqhelekileyo kulawulwa phakathi koluhlu oluthile lwe- 40% -60% RH , zidibaniswe nommiselo wokushisa. Izinga lokunyuka kwe-evaporation lihlengahlengiswa ukuba libe ngaphantsi kancinci kunezinga lokuthuthwa kwe-capillary yamanzi kwi-emulsion ngaphakathi kwenethiwekhi ye-capillary, iqinisekisa ukungena okupheleleyo kunye nomgangatho we-emulsion ngelixa ufezekisa iifilimu ezingenasiphako, ezixinene kakhulu ze-PTFE sintered.

Impembelelo engundoqo yokufuma kokusingqongileyo kwi-PTFE emulsion impregnation ilele kwibhalansi eguquguqukayo phakathi kwezinga lokunyuka kwamanzi kunye nokuzinza kwe-emulsion. I-emulsion ye-PTFE iqhele ukuba yi-non-Newtonian fluid eyenziwe ngamasuntswana e-PTFE resin (i-dispersed phase), i-surfactants, izinzisi, kunye namanzi (isigaba esiqhubekayo). Njengeparamitha yokusingqongileyo, ukufuma kulawula i-volatilization kinetics yesinyibilikisi (amanzi), sisebenzisa iziphumo ezingundoqo ngolu hlobo lulandelayo:

1. Iimpembelelo ezisisiseko kwiNkqubo yokuKhulelwa

Inqanaba lokukhulelwa lifuna i-emulsion ukuba ingene ngokufanelekileyo kwiipores okanye i-fiber gaps ye-substrate (umzekelo, i-glass fiber cloth, i-mesh yensimbi).

Ubume bokufuma obuphantsi : Amanzi aba ngumphunga ngokukhawuleza kakhulu, nto leyo ebangela ukuba i-emulsion 'yome phezu komhlaba' ngokukhawuleza kwi-substrate. Oku kwandisa kakhulu i-viscosity ebonakalayo ye-emulsion kwi-interface, inqanda ukungena kwe-capillary ye-resin particles kwi-substrate enzulu kwaye kubangele 'i-impregnation enganeleyo' - oko kukuthi, iipokotshi zomoya eziseleyo ngaphakathi kwe-substrate. Ngeli xesha, ukuvela komphunga okukhawulezayo kususa izixa ezikhulu zobushushu, obunokuthi bubangele ukuhla ngesiquphe kobushushu bendawo, kuphazamisa i-emulsion thermodynamically kwaye kubangele imvula ye-surfactant, ekhokelela 'kwixolo le-orenji' okanye ukutyeba okungalinganiyo kumaleko afakwe ngaphakathi.

Ubume obuphezulu bomswakama : Ukunyuka kwamanzi kunqatshelwe, kwaye i-emulsion ihlala kwindawo ephantsi ye-viscosity emanzi kwi-substrate ixesha elide kakhulu. Kwii-substrates ezithe nkqo okanye ezithambekileyo, ukudodobala kwenzeka ngokulula phantsi komxhuzulane; kwi-substrates ene-hygroscopic ephezulu, ukufuma okuphezulu kunokuthintela ukukhutshwa kwerhasi ngaphakathi kwi-substrate, yenze ii-microbubbles ezikhula zibe ziziphene ze-pinhole ngexesha lokutshisa okulandelayo.

2. Iimpembelelo ezisisiseko kuMgangatho wokuGqibela wokwenziwa kweFilimu

Ukubunjwa kwefilimu ye-PTFE ngokubanzi kubandakanya izigaba ezibini: ukomisa (ukususwa kwamanzi) kunye nobushushu obuphezulu be-sintering (i-particle melting). Ukufuma kuchaphazela ubukhulu becala isakhiwo somzimba oluhlaza ngexesha lokumisa, 'ifa' kwifilimu yokugqibela ye-sintered.

Ukuqhekeka kunye noxinzelelo lwangaphakathi : Ukubunjwa kwefilimu ye-PTFE ye-resin particles ixhomekeke kuxinzelelo lwe-capillary ngexesha lokuphuma kwamanzi ukuba libe ngumphunga ukucinezela amasuntswana kwi-dense packed layer. Ukufuma okuphantsi kakhulu kubangela ukonyuka okubukhali koxinzelelo lwe-capillary gradient kunye nokushwabana okukhawulezileyo ukomisa, kuvelisa uxinzelelo olukhulu lwangaphakathi ngaphakathi kumzimba oluhlaza. Ekubeni i-PTFE iswele amandla okuziphilisa ngaphambi kokuba i-sintering, uxinzelelo olunjalo lukhokelela ngokuthe ngqo kwi-microcracks okanye i-macroscopic cracking kumzimba oluhlaza. Ezi ziqhekeza azikwazi ukupheliswa emva kokucwina, okubangelwa ukuvuza kwefilimu okanye ukunciphisa amandla omatshini.

Ukufuduka kwe-surfactant kunye nentsalela : Ii-surfactants (ezifana nezinye ze-perfluorooctanoic acid) eziqulethwe kwii-emulsions ze-PTFE zentengiso zifuduka kunye ne-evaporation yamanzi ngexesha lokumisa. Imekobume yokufuma okuphezulu iyandisa ifestile yokomisa, ivumela ixesha elaneleyo lokuba ii-surfactants ziqokelelane kumphezulu, zenze 'i-oyile etyibilikayo' okanye ulusu oluqinileyo. Ukuba olu maleko aluchithwanga ngokupheleleyo okanye luguquguquke kwisigaba sokuqala se-sintering, siya kuba yikhabhoni kwaye ifakwe ngaphakathi kwefilimu, ibangele i-yellowing, iyancipha ukuxinana, kunye nokunciphisa kakhulu ukunamathela phakathi kwe-PTFE kunye ne-substrate (i-bonding embi ye-interfacial bonding ngenxa yokuhlukaniswa okungcolileyo).

Ukuxinwa kwefilimu kunye ne-porosity : Ifilimu efanelekileyo ye-PTFE kufuneka ingabi namingxuma kwaye ixinene. Ulawulo lokufuma olungafanelekanga olukhokelela kubumanzi obushiyekileyo yingozi enkulu. Ngaphantsi kokufuma okuphezulu, ukuba amanzi awasuswanga ngokupheleleyo ngexesha lokufudumeza kunye nokomisa, ukufuma okushiyekileyo kuye kuphuphe kwangoko ngexesha le-sintering elandelayo (malunga ne-327-400 ° C) kunye nokwandiswa komthamo omkhulu, ukudala i-blowholes okanye i-blister interlayer kwifilimu enyibilike kancinci. Kwelinye icala, phantsi kokufuma okuphantsi kakhulu, ukomiswa okukhawulezayo komphezulu kwenza ulusu olutywiniweyo oluthintela ukuphuma kwamanzi angaphakathi, okubangela amadyungudyungu okanye ukubola ngexesha lokuntywila ngenxa yoxinzelelo lomphunga oluqokelelweyo.

Ngokomgaqo, impembelelo yokufuma kokusingqongileyo kwi-PTFE emulsion processing lungenelelo kwikinetics yokuguquka kwamanzi:

•  Ukufuma okuphantsi (ukoma okugqithisileyo)  kuthanda ukubangela: ukungangeni kakuhle, ukuvaleka komgangatho (imingxuma eshwabeneyo), ukomisa iintanda, kunye nokungalingani kokusasazwa kweentsalela ze-surfactant.

Ukufuma okuphezulu  (ukufuma okugqithisileyo)  kuthanda ukubangela: ukuhexa, ukunyuka kwemingxunya, ukudada okugqithisileyo kwe-surfactant, amadyungudyungu emva kokuntywila, kunye nokuncipha kokuncamathela.

Olu lwazi lungentla lunikwe nguJiangsu Aokai New Materials Technology Co., Ltd.

Iiparameters ezineenkcukacha, iimeko zesicelo kunye nezisombululo ezilungelelanisiweyo zoluhlu lwethu olupheleleyo lwemveliso, kubandakanywa i-PTFE yokushisa okuphezulu kwelaphu, i-PTFE iteyiphu yobushushu obuphezulu, i-PTFE ye-mesh belt, ibhanti elinomthungo elingenamthungo, ilaphu le-PTFE elinecala elinye, i-high-temperature-high-temperature, i-glass-resistant conveyor, i-glass-resistant resistant, i-glass-resistant resistant, i-glass-resistant conveyor, njl.

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