Gelisi ya silika ndi mtundu wa zinthu zomwe zimagwira ntchito kwambiri.
Ndi chinthu cha amorphous ndipo mankhwala ake ndi mSiO2.nH2O. Imakumana ndi mankhwala aku China HG/T2765-2005. Ndi zopangira za desiccant zovomerezeka ndi FDA zomwe zimatha kulumikizana mwachindunji ndi chakudya ndi mankhwala. Gelisi ya silika imakhala ndi mphamvu yamphamvu ya hygroscopic, yogwira ntchito mwamphamvu, ngakhale silika gel desiccant ikamizidwa m'madzi, sichidzafewetsa kapena kusungunuka. Zili ndi makhalidwe omwe alibe poizoni, osapweteka, osawononga komanso osawononga, kotero amatha kukhudzana mwachindunji ndi chinthu chilichonse. Zida zomwe zimayenera kukonzekera kupanga gel osakaniza ndi: sodium silicate (paucine, galasi lamadzi), sulfuric acid.
Choyamba, alkali ndi asidi zakonzedwa pasadakhale, ndiyeno olimba sodium silicate ndi kusungunuka pa kutentha ndi osasankhidwa kukonzekera ndende ya madzi, ndiyeno asidi sulfuric zakonzedwa kuti ena ndende ya madzi, ndende ya sulfuric. asidi ndi 20%.
Chachiwiri, sitepe yachiwiri ndi kupanga guluu (gel osakaniza granulation), sitepe ndi yovuta kwambiri, chisanadze modulated kuwira lye ndi sulfuric asidi njira pansi pa mikhalidwe yeniyeni, kuti apange sungunuka gel osakaniza njira, akafika ndende yoyenera. kukhala gel osakaniza. Maonekedwe ndi kukula kwa particles akhoza kwathunthu anatsimikiza malinga ndi zosowa wosuta ndi mphamvu kupanga. Njira yodziwika bwino ya granulation ya gel ndi granulation ya mpweya, ndipo chiŵerengero cha acid-base, ndende, kutentha ndi nthawi ya granulation ya gel yomwe imagwiritsidwa ntchito mu ndondomeko ya granulation ya gel ndizomwe zimagwiritsidwa ntchito patekinoloje.
Chachitatu, gel okalamba ayenera kudutsa nthawi yochuluka ndi kutentha, komanso PH mtengo mpaka msinkhu, kupangitsa mafupa a gel kukhala olimba, kutsekemera kwa guluu pakati pa tinthu tating'onoting'ono timene timakalamba kuti tipange mgwirizano wa Si-O-Si, kuwonjezera Mphamvu ya mafupa, tinthu tating'onoting'ono timayandikana kwa wina ndi mnzake, kuchepetsa malo mu gridi kapangidwe kambiri, ndipo madzi omwe ali mmenemo amafinya.
Pickling, kutsuka, kutsuka guluu Kutola, kutsuka, kutsuka guluu ndi gawo lofunika kwambiri pakuchitapo kanthu, chifukwa Na2SO4 yopangidwa ndi gel osakaniza imatsukidwa. Yang'anirani anion iliyonse mkati mwazofunikira ndi ndondomekoyi. Tinganene kuti mbali yaikulu ya pore makhalidwe a yomalizidwa silika gel osakaniza anatsimikiza ndi ukalamba wa kuchapa mphira ndondomeko, ndi ukalamba digiri ya ndondomekoyi zimadalira opareshoni mu pickling, kutsuka, ndi kuchapa mphira ndondomeko.
Chachisanu, kuyanika, hydrogel okonzeka (pambuyo kutsuka) m'chipinda chowumitsira, mumikhalidwe yeniyeni kuti muchepetse madzi omwe ali mu gel osakaniza kuyanika mpaka pakufunika. The apamwamba kuyanika kutentha, ndi apamwamba mlingo wa pulayimale tinthu aggregation ndi lalikulu kabowo.
Zisanu, zowonera, makina osankhidwa a mpira adzaumitsidwa pambuyo pa silikoni kudzera pa zenera la ma apertures osiyanasiyana malinga ndi mtundu wina wa tinthu tating'onoting'ono, ndipo nthawi yomweyo adzasweka silika gel osakaniza.
Zisanu ndi ziwiri, zomatira zomatira: gel osakaniza mu mpira wa heterochromatic, zonyansa zimasankha ndikugwiritsira ntchito pepala lophatikizana molingana ndi zofunikira pakuyika, mutasindikiza. Pambuyo pa masitepe omwe ali pamwambawa, mankhwala a silicone amapangidwa.
Nthawi yotumiza: Nov-14-2023
