Kwibala lombane, enye yezinto ezibalulekileyo kwiingcingo zombane kunye neentambo kukuzigquma kunye nemathiriyeli yokufaka ijacket.Kwiminyaka emininzi, eyona nto iphambili yokugquma iintambo zombane yayiliphepha elifakwe ioyile ngenxa yeempawu zalo zombane ezigqwesileyo.Kananjalo inomthamo wokumelana neqondo eliphezulu lokugcwala kwe-thermal ngaphandle kokuwohloka ngokugqithisileyo.Nangona kunjalo, ngenxa ye-hygroscopicnature yayo, i-sheath yensimbi i-corrod.Kwakukho, ke ngoko, imfuno ekudala ivakale yemathiriyeli yokugquma esebenza ngentambo, eyayinendibaniselwano yendalo engeyiyo i-hygroscopic ye-thermoplasticmaterials.
Uphando oluqhubekayo lwezinto ezinjalo zephupha ekugqibeleni lubangele ukufunyanwa kwe-polyethylene edibeneyo.Ukudityaniswa kweepolymers kubhekiselele kuhlengahlengiso lweepropathi zepolymer ngokufaka amakhonkco ekhemikhali phakathi kwe-macromolecules nganye.Ngokudibanisa iipolymers ezifana ne-aspolyethylene, inethiwekhi ye-dimensional-dimensional network of bonds yenziwa phakathi kwamakhonkco e-polymer eyandisa ubunzima bemolekyuli.Oku kufana nendlela 'yerabha evuthisayo'.
Inkqubo yesiqhelo 'yevulcanisation' ibandakanya ukufudumeza kunye nokongeza isulfure okanye ezinye iikhemikhali ukwenza udibaniso phakathi kweempawu zamatyathanga amade eemolekyuli ze-elastomer.Le nkqubo yaqala kudala kwaye isasetyenziswa nangoku.Ipropati yepolymer ixhomekeke kubungakanani besulfure esetyenzisiweyo.Ngaphezu koko i-sulfure esetyenziswayo kukuba, imveliso inzima ngakumbi, ekwazi ukumelana nobushushu obuphezulu, uxinzelelo kunye nemiceli mngeni yobuchule kwimfezeko yayo.Kodwa i-sulphur vulcanisation inezithintelo ezinzima ngokubhekiselele kwimpilo yabantu kunye nokusingqongileyo kwaye ineengxaki zoqoqosho.Ngaphezu koko, ifuna ubushushu obuphezulu ukuqalisa ukusebenza kweekhemikhali kwaye ikhuphe iigesi ezinukayo neziyityhefu kunye nokuvelisa iintsalela zeekhemikhali ezingafunekiyo ekufuneka zisuswe kwimveliso yokugqibela.
'I-radiation crosslinking' yindlela engqinwe kakuhle edlula zonke ezi ziphumo zingalunganga zenkqubo ye-thevulcanization.Yindlela yobushushu begumbi enenzuzo ebalulekileyo yeendleko ngokwayo.Ilawulwa ngokulula kwaye iipropathi ezifunwayo zepolymer zifumaneka ngokulula ngokutshintsha ithamo (ixesha lokukhanya).Izinto eziguquliweyo azikho ngaphantsi nangayiphi na indlela kwezo ziveliswe yisulphurvulcanization.
Into ephambili yokuphambana kukuphucula ukuxhathisa kwe-thermal.Ngokubanzi, ubushushu obuvumelekileyo kwisekethi emfutshane yi-140⬚C kwintambo ye-polyethylene engadityaniswanga inokuphuculwa ukuya kuma-250⬚C ngenkqubo yokuqhambuka kwemitha.Eyesibini eyona njongo ixhaphakileyo yimpembelelo yenkumbulo efana nokuboniswa yi-shrink tubing.Le yipropati engaqhelekanga kunye nexabiso le-polyethylene ene-irradiated kwaye igcinwa ngokungenasiphelo kwipolymer kungakhathaliseki ixesha kunye naliphi na inani elilandelayo lokuguqulwa.Ngoko ke, ukuba i-polyethylene ifakwe kwi-irradiated kwifom yecrystalline inxalenye (okt ngaphantsi kwendawo yokunyibilika kwayo) kwaye ifudunyezwe ukususa iikristale, inokukhubazeka kakhulu (umz. ngokuzolula) kwaye iphinde ipholiswe kwakhona kwiikristale ukuze iguqule kwimo yayo entsha.Ukuba imathiriyeli ishushu kwakhona ngaphezu kokunyibilika, ezi kristale ziyanyamalala kwaye i-polyethylene efana nerabha iya kuthambekela ekubuyeleni kwimilo ukuba igcinwe ngexesha lokukhanya kwemitha mhlawumbi kwiinyanga okanye iminyaka ngaphambili.Ityhubhu yokucutha yenziwa ngokukhupha ipholima eyenziwe ngokukodwa kwityhubhu kwaye emva koko idibanise le tyhubhu.Emva kwe-crosslinking, i-tube iyafudumala, yandiswe kwaye ipholile kwifom eyandisiweyo.Le ityhubhu eyandisiweyo, xa iphinda ifudunyezwa izakubuyela kwisimo sayo sokuqala, ngenxa yesiphumo senkumbulo sokuwela.Ekubeni i-polymermolecules idityaniswe ngokwekhemikhali enye kwenye kwaye ayisakwazi ukuhamba ngokungaqhelekanga, izinto ezahlukeneyo ezifana nokumelana nobushushu, ukuxhathisa kwe-abrasion, ukuzinza kwe-dimensional, ipropati yokubambelela njl.Ngoko ke, ukudibanisa kunokunika izinto ezinqwenelekayo kwipolymer, oko kukuthi, ukuqina, ukuguquguquka, ukunganyangeki kwempembelelo, ukumelana neekhemikhali, njl. I-polyethylene e-Irradiated isetyenziswa ngokubanzi kwiifilimu ezishwabenekayo zokupakisha, ukudibanisa kunye nokudityaniswa kombane, ezinokutshatyalaliswa ngokukhawuleza ubushushu kwamanye amacandelo. .Ukuze ube bhetyebhetye, ucingo oludityanisiweyo/ufakelo lwentambo kulula kwaye alunamda wobude.Ngaphezu koko, akukho sheath yesinyithi efunekayo ukuze ulondolozwe.Ukongeza, iipropathi zokuqina ziphakathi phakathi kwe-thermoplastic kunye ne-anelastomer.
Ixesha lokuposa: Feb-18-2017