Ufa wa aluminiyamu wopyapyala kwambiri uli ndi ntchito zambiri monga choletsa moto, kuchotsa utsi ndi kudzaza, ndipo ukhoza kupanga mphamvu yogwirizana yoletsa moto ndi phosphorous ndi zinthu zina. Ndi chinthu chofunikira kwambiri choteteza moto m'mafakitale amagetsi, mankhwala, zingwe, pulasitiki, rabara ndi mafakitale ena.
Aluminium hydroxide ndi chinthu choletsa moto chosapangidwa ndi zinthu zachilengedwe, kuti chikhale ndi mphamvu yoletsa moto bwino, kuchuluka kwa zinthuzo kuyenera kupitirira 40% (kuchuluka konse), zina mpaka 60%, koma kuchuluka kwa zinthuzo sikungokhudza kwambiri mphamvu za makina a zinthuzo, komanso kumapangitsa kuti ntchito yotulutsa ndi kukonza zinthu iipireipire.
Choncho, kuti apange ufa wa aluminiyamu wabwino kwambiri, womwe ungagwiritsidwe ntchito kwambiri mu zinthu zotetezera moto monga polyolefin, uyenera kusinthidwa pamwamba pa aluminiyamu, kuti ukhale ndi mphamvu zakuthupi ndi mankhwala, uwonjezere ufa wa aluminiyamu wabwino kwambiri komanso wofanana ndi wa organic polymer kapena resin, komanso kuti ukhale wofanana ndi wa organic substrate, kuti ukhale ndi mphamvu ya makina komanso magwiridwe antchito ambiri.
1. Chosinthira pamwamba chomwe chimagwiritsidwa ntchito kwambiri pa ultrafine aluminiyamu hydroxide
(1) wothandizira kulumikizana ndi silane
Pali mitundu yoposa zana ya zinthu zolumikizirana ndi silane, pakati pa zinthu zomwe cholumikizira chimodzi cha silane chomwe chimagwira ntchito ndi chokhazikika kwambiri. Kukhazikika kwa cholumikizirana ndi silane cha gulu chomwe chimagwira ntchito ndi pakati pa chitsulo ndi chitsulo. Kuphatikiza pa kukulitsa mphamvu zamakina a zinthuzo, cholumikizira cha silane cha gulu chomwe chimagwira ntchito chingathandizenso kukonza mphamvu zamagetsi ndi kukana chinyezi kwa zinthuzo.
(2) wothandizira wolumikizira zirconium
Gulu la zirconium coupling agent lomwe lili ndi zirconium aluminate lili ndi mamolekyulu ochepa a polymer osapangidwa mu unyolo waukulu wa molekyulu pa complexation ya mitundu iwiri ya organic ligand subunits, dentate yokhala ndi coupling agent yabwino hydroxyl stability, dentate ina yolumikizana ndi coupling agent yabwino organic reactions, aluminiyamu hydroxide superfine aluminiyamu hydroxide ufa uli ndi zotsatira zabwino zosinthidwa.
(3) mafuta ambiri ndi mchere wawo
Mu kapangidwe ka mamolekyu a ma asidi apamwamba amafuta ndi mchere wawo, mbali imodzi ndi gulu la alkyl lalitali, ndipo mbali inayo ndi gulu la carboxyl ndi mchere wake wachitsulo womwe ungagwirizane ndi magulu ogwira ntchito a aluminiyamu hydroxide pamwamba. Kuchiza ufa wa aluminiyamu wa ultrafine hydroxide ndi asidi wambiri wamafuta ndi mchere wake kungathandize kuyanjana pakati pa ufa wa aluminiyamu wa hydroxide wa ultrafine ndi molekyulu ya polima, ndikuwonjezera mphamvu zamakanika ndi zokonzera za mankhwalawa.
(4) ma asidi osakhuta achilengedwe
Ma asidi osakwanira achilengedwe ndi awa: acrylic acid, methacrylic acid, cinnamic acid, ndi zina zotero. Kawirikawiri, asidi ikakhala yolimba, zimakhala zosavuta kupanga ionic bond, choncho sankhani zambiri: acrylic acid ndi methacrylic acid.
Zidulo zosiyanasiyana za organic zingagwiritsidwe ntchito zokha, komanso zitha kugwiritsidwa ntchito mosakaniza, pochiza ayoni achitsulo a alkali okhala ndi mchere wa ultrafine aluminiyamu hydroxide ufa, zotsatira zake zimakhala zabwino.
(5) organosilicon
Ma micromolecule organosilicon, omwe amadziwikanso kuti mafuta a silicon, ndi mtundu wa polima womwe umalumikizidwa ndi gulu la organic pa atomu ya silicon ndi unyolo wa silicon oxygen bond (si-o-si) ngati chigoba. Ma polymethylsiloxane okhala ndi hydrogen, polydimethylsiloxane yotsirizira ya hydroxyl, ndi zina zotero zimagwiritsidwa ntchito kwambiri.
2. Njira yosinthira pamwamba pa aluminiyamu yabwino kwambiri ya hydroxide
Pakadali pano, njira zosinthira pamwamba pa ufa wa aluminiyamu wa ultrafine hydroxide ndi zouma komanso zonyowa.
(1) kusintha kouma
Munjira imeneyi, ufa wa aluminiyamu wosinthidwa wa ultrafine hydroxide umatenthedwa kutentha kwinakwake, ndipo chosinthira chimadonthezedwa pang'onopang'ono mu ufa wa aluminiyamu wothamanga kwambiri, ndipo chinthucho chimayimitsidwa kuti chipakidwe pambuyo pa nthawi inayake.
Ubwino wa kusintha kouma ndi wochepa pazida ndi ntchito yosavuta. Choyipa chake ndichakuti mphamvu ya ogwira ntchito ndi yayikulu, kuchuluka kwa utoto wa aluminiyamu hydroxide ndi kochepa.
(2) kusintha konyowa
Kusintha konyowa kumachitika mu njira yopangira ufa wa aluminiyamu wopyapyala kwambiri, kupanga kwa slurry ya aluminiyamu pambuyo posefa, kutsuka, kusefa keke, kutentha kwina kwa slurry pambuyo powonjezera modifier, kusakaniza kwa nthawi, kusefa, kuumitsa ndi kumenya phukusi.
Ubwino wa kusintha konyowa ndi mphamvu yochepa ya ntchito, kusakhala ndi fumbi loipa, kugwira ntchito bwino kwambiri, kuchuluka kwa aluminiyamu hydroxide powder coating rate, 20-30%, zotsatira zake zimakhala zapamwamba komanso zokhazikika. Poyerekeza ndi kusintha kouma, kusintha konyowa kumakhala ndi njira yayitali komanso zofunikira kwambiri pazida. Chifukwa cha ubwino wa kusintha konyowa, pang'onopang'ono kumalowa m'malo mwa njira yopangira kusintha kouma.
3. Njira yowunikira momwe pamwamba pake pasinthira mphamvu ya ultrafine aluminiyamu hydroxide
(1) mayeso a kuchuluka kwa mafuta omwe amayamwa
Kuchuluka kwa mafuta omwe amayamwa kumagwiritsidwa ntchito makamaka poyesa kuchuluka kwa mafuta a castor omwe amafunikira pamene kuchuluka kwa ufa wa Al (OH) 3 kwafika polowa mu saturation, ndipo kumagwiritsidwa ntchito poyesa kuchuluka kwa utomoni womwe umafunikira pamene kuchuluka kwa ufa wa Al (OH) 3 kwafika polowa mu saturation.
Njira yodziwira ndi iyi: ufa wa alumina hydroxide wabwino kwambiri umayesedwa ndipo chitsanzo chouma chimakhala pafupifupi 10g, ndikuyikidwa mu beaker, ndikuyika mafuta a castor ndi burette, ndikusakaniza pang'ono ndi ndodo yagalasi kuti apange mafuta a castor ndikulowetsa mofanana mu mpira. Kuchuluka kwa mafuta a castor omwe amatengedwa pa 100g ya aluminium hydroxide kunawerengedwa, ndiko kuti, kuchuluka kwa kuyamwa kwa mafuta a ufa wa ultrafine aluminium hydroxide.
Pambuyo posintha pamwamba pa ufa wa aluminiyamu hydroxide, kuchuluka kwa kuyamwa kwa mafuta kudzasintha pang'ono. Ngati ufa wa aluminiyamu hydroxide wa ultrafine wasinthidwa ndi silane coupling agent, kuchuluka kwa kuyamwa kwa mafuta kudzachepa ndi pafupifupi 10%.
(2) Mayeso a SEM
Kapangidwe ka ufa wa aluminium hydroxide wopangidwa ndi ultrafine asanayambe komanso atasinthidwa kanazindikirika ndi maikulosikopu ya elekitironi. Kufalikira kwa ufa wosinthidwa mu matrix kunali bwino kuposa kwa chinthu chosasinthidwa.
(3) Kuyesa kwa FTIR
Fourier infrared spectroscopy (ftir) idagwiritsidwa ntchito pofufuza magulu omwe ali pamwamba pa chinthucho. Mwachitsanzo, kuchuluka kwa vinyl - Vi ndi - Si kumatha kudziwika ndi ir spectra ya aluminiyamu hydroxide powder ndi kusintha kwa wet surface ya methyl vinyl silane.
(4) kudziwa za katundu wa chinthucho
Ufa wa aluminiyamu wosinthidwa komanso wosasinthidwa wa ultrafine hydroxide unagwiritsidwa ntchito poyesa ma index a chingwe monga index ya okosijeni, mphamvu yolimba komanso kutalika kwake pakagwa. Poyerekeza, zitha kupezeka kuti mphamvu zoletsa moto ndi makina a zinthu zosinthidwa zakula.
(5) chisonyezero choyambitsa
Chizindikiro choyambitsa ndi chizindikiro chowunikira momwe zinthu zilili pamadzi poyesa kuchuluka kwa aluminiyamu hydroxide yomwe ikuyandama pamwamba pa madzi kufika pa kuchuluka kwa aluminiyamu hydroxide yonse ikasinthidwa. Chifukwa cha mitundu yosiyanasiyana ya zinthu zosinthira pamwamba ndi njira zosiyanasiyana zochizira ufa wa aluminiyamu hydroxide wa ultrafine, ufa wina wosinthidwa udzayandama pamwamba pa madzi ndipo wina udzamira.
Monga sodium stearate, titanate wet modification, hydrophobic silane dry modification pambuyo pa ultrafine aluminiyamu hydroxide powder, activation index ingagwiritsidwe ntchito kuwunika momwe kusintha kukuyendera; Komabe, hydrophilic silane idasinthidwa ndi njira youma, ndipo ultrafine aluminiyamu hydroxide powder yosinthidwa ndi njira yonyowa ya silane ikanamira m'madzi, kotero kusintha sikungatheke kuwunika ndi activation index, ndipo njira yolondola yowunikira inali infrared spectroscopy.
Nthawi yotumizira: Epulo-24-2020