Yintoni imathiriyeli yePVDF?
I-Polyvinylidene Fluoride (PVDF) yimathiriyeli esebenza kakhulu esetyenziswa kakhulu kwimizi-mveliso yeekhemikhali nakwimizi-mveliso, kwaye ithandwa ngenxa yokuxhathisa kwayo ngemichiza, iipropathi zombane kunye namandla omatshini. Kweli nqaku, siza kuhlalutya ngokweenkcukacha ukuba yintoni i-PVDF, iipropati zayo, izicelo kunye nenkqubo yokuvelisa ukukunceda uqonde ngcono izibonelelo zalo mbandela.
Okokuqala, iimpawu ezisisiseko zePVDF
I-PVDF yi-semi-crystalline thermoplastic fluoropolymer, ikakhulu i-polymerised ukusuka kwi-vinylidene fluoride (VDF) monomer. Ngenxa ye-electronegativity ephezulu ye-athomu ye-fluorine kunye namandla e-CF bond, i-PVDF ibonisa ezi mpawu zilandelayo:

Ukumelana nemichiza: I-PVDF ixhathisa kakhulu kwiiasidi ezininzi, iialkali, iityuwa kunye nezinyibilikisi, nto leyo eyenza ukuba izinze kwaye imelane nokubola kwishishini lemichiza ngokuhamba kwexesha.

Amandla oomatshini: I-PVDF inamandla abalaseleyo okuqina kunye nokumelana nempembelelo, eyivumela ukuba igcine imfezeko yolwakhiwo kwindawo enzima.

Iimpawu zombane: Ngenxa yokungaguquguquki kwedielectric ephantsi kunye neempawu eziphezulu zokugquma, iPVDF isetyenziswa kakhulu kwimimandla yombane neye-elektroniki, ngakumbi njengesixhobo sokugquma iingcingo kunye neentambo.

Uzinzo lwe-Thermal: I-PVDF inozinzo oluhle lwe-thermal kwaye inokusetyenziswa kuluhlu olubanzi lwamaqondo obushushu, kwaye ngokuqhelekileyo ikwazi ukugcina iimpawu zayo ezibonakalayo kwiqondo lokushisa eliphakathi kwe -40 ° C ukuya kwi-150 ° C.

Okwesibini, inkqubo yemveliso yePVDF
Imveliso ye-PVDF iphunyezwa ikakhulu nge-polymerisation yasimahla, ngokuqhelekileyo ngesisombululo sepolymerisation okanye ukumiswa kwepolymerisation. Kwinkqubo ye-polymerization, ii-monomers ze-VDF zenziwe nge-polymeri ye-PVDF phantsi kweemeko ezithile zokusabela. Emva koko, ngoluhlu lweenkqubo zonyango emva kokunyanga, kubandakanywa ukuhlanjululwa, ukukhupha kunye ne-granulation, ukubunjwa kokugqibela kweemveliso ze-PVDF ezineempawu ezithile zomzimba.
Okwesithathu, iindawo eziphambili zesicelo sePVDF
I-PVDF isetyenziswe ngokubanzi kumashishini amaninzi ngenxa yokusebenza kwayo kakuhle:

Umzi-mveliso wemichiza: IPVDF idla ngokusetyenziswa xa kusenziwa iintlobo ngeentlobo zezikhongozeli zeekhemikhali, imibhobho kunye neevalvu, ngakumbi xa kusenziwa imichiza etshabalalisayo.

Umzi-mveliso wokwakha: I-PVDF isetyenziselwa ukwenziwa kweengubo eziphezulu zokusebenza, ezifana neengubo ze-fluorocarbon, ezisetyenziselwa ukukhusela iindonga zangaphandle zezakhiwo, kwaye zikwazi ukugcina ubuhle bezakhiwo ixesha elide ngenxa ye-UV kunye neempawu ezikwazi ukumelana nokuguga.

Imboni yombane kunye nombane: I-PVDF isetyenziswa ngokubanzi kwimveliso yeentambo, izihlanganisi kunye ne-lithium yebhetri ye-diaphragms ngenxa yokutshatyalaliswa kombane okugqwesileyo kunye nokumelana nobushushu.

Imboni yokucoca amanzi: Izinto ze-membrane ze-PVDF zisetyenziswa kwintsimi yonyango lwamanzi, ngokukodwa kwi-ultrafiltration kunye ne-nanofiltration membranes, ezithandwa kakhulu ngenxa yokumelana neekhemikhali eziphezulu kunye nokuchaneka okuphezulu kokucoca.

Okwesine, amathuba emarike kunye nemingeni yePVDF
Ngokukhawuleza kwezoshishino kunye nokunyuka kwemfuno yezinto eziphezulu zokusebenza, imarike ye-PVDF ikhula ngokukhawuleza.Ixabiso eliphezulu lokuvelisa kunye nobunzima benkqubo yokuvelisa i-PVDF yenza ixabiso layo lemarike libiza kakhulu. Ukusetyenziswa kwe-PVDF kukwajongene nemingeni ethile ngenxa yemicimbi yayo enxulumene ne-fluoride yokusingqongileyo. Ngoko ke, ukulungiswa kwenkqubo yokuvelisa kunye nokunciphisa impembelelo yokusingqongileyo ye-PVDF kuya kuba ngundoqo kuphuhliso lwexesha elizayo.
Isishwankathelo
Yintoni imathiriyeli yePVDF? Ngolu hlalutyo lungentla, sinokubona ukuba i-PVDF yinto ephezulu yokusebenza kwe-fluoropolymer kunye noluhlu olubanzi lwamathemba okusebenza. Ukumelana kwayo neekhemikhali okugqwesileyo, amandla omatshini, iipropati zombane kunye nokuzinza kwe-thermal kwenza ukuba idlale indima ebalulekileyo kwiinkalo ezininzi. Ngokuphuculwa kweemfuno zokhuseleko lokusingqongileyo, ukuveliswa kunye nokusetyenziswa kwe-PVDF kuya kujongana nemingeni emitsha kunye namathuba. Ukuqonda kunye nokulawula iipropati kunye nokusetyenziswa kwe-PVDF kunokubonelela ngenkxaso ebalulekileyo ekusungulweni nasekuphuhliseni amashishini anxulumeneyo.