Hydroxypropyl starch ether (HPS)ndicellulose etherndi zinthu ziwiri zomwe zimagwiritsidwa ntchito pomanga mankhwala, zomwe zimagwiritsidwa ntchito kwambiri muzomangamanga, monga matope, putty powder, zokutira, etc. Ngakhale kuti ali ndi zofanana muzinthu zina, pali kusiyana kwakukulu muzinthu zambiri monga magwero opangira zinthu, mapangidwe a mankhwala, katundu wakuthupi, zotsatira za ntchito, ndi ndalama.
1. Zopangira zopangira ndi kapangidwe ka mankhwala
Hydroxypropyl starch ether (HPS)
HPS idakhazikitsidwa ndi wowuma wachilengedwe ndipo imapezeka kudzera mu kachitidwe ka etherification. Zida zake zazikulu ndi chimanga, tirigu, mbatata ndi zomera zina zachilengedwe. Mamolekyu owuma amapangidwa ndi mayunitsi a shuga olumikizidwa ndi α-1,4-glycosidic bond ndi kachulukidwe kakang'ono ka α-1,6-glycosidic. Pambuyo pa hydroxypropylation, gulu la hydrophilic hydroxypropyl limalowetsedwa mu mawonekedwe a maselo a HPS, ndikuwapatsa kukhuthala, kusunga madzi ndikusintha ntchito.
cellulose ether
Ma cellulose ether amachokera ku cellulose yachilengedwe, monga thonje kapena nkhuni. Ma cellulose amapangidwa ndi mayunitsi a shuga omwe amalumikizidwa ndi β-1,4-glycosidic bond. Ma cellulose ethers ambiri amaphatikiza hydroxypropyl methylcellulose (HPMC), methylcellulose (MC), hydroxyethyl cellulose (HEC), ndi zina zotere. Mankhwalawa amayambitsa zolowa m'malo osiyanasiyana kudzera muzochita za etherification ndipo amakhala ndi kukhazikika kwamankhwala apamwamba komanso thupi.
2. Zinthu zakuthupi
Mawonekedwe a HPS
Kukhuthala: HPS imakhala ndi kukhuthala kwabwino, koma kuyerekeza ndi cellulose ether, kukhuthala kwake ndikocheperako pang'ono.
Kusunga madzi: HPS imakhala ndi madzi osungira bwino ndipo ndiyoyenera kupangira zida zomangira zotsika mpaka zapakati.
Kugwira ntchito: HPS imatha kukonza magwiridwe antchito a matope ndikuchepetsa kugwa panthawi yomanga.
Kutentha kukana: HPS imakhudzidwa kwambiri ndi kutentha ndipo imakhudzidwa kwambiri ndi kutentha kozungulira.
Mawonekedwe a ma cellulose ethers
Kukhuthala: Ma cellulose ether ali ndi mphamvu yakukhuthala ndipo amatha kukulitsa kukhuthala kwa matope kapena putty.
Kusungirako madzi: Ma cellulose ether ali ndi zinthu zabwino kwambiri zosungira madzi, makamaka m'malo otentha kwambiri, omwe amatha kuwonjezera nthawi yotsegula matope ndikuletsa kutaya madzi ochulukirapo.
Kugwira ntchito: Ma cellulose ether ndi abwino kwambiri pakuwongolera magwiridwe antchito ndipo amatha kuchepetsa mavuto monga kusweka ndi ufa.
Kutentha kukana: Ma cellulose ether amatha kusintha kwambiri kutentha komanso kugwira ntchito mokhazikika.
3. Zotsatira za ntchito
Ntchito zotsatira zaHPS
Mumatope owuma, HPS imagwira ntchito makamaka pakuwongolera magwiridwe antchito, kukonza kasungidwe kamadzi, ndikuchepetsa delamination ndi tsankho. Ndiwotsika mtengo komanso oyenera kugwiritsidwa ntchito pamikhalidwe yokhala ndi zofunikira zowongolera mtengo wokwera, monga wamba wamba wamkati wamkati wa putty ufa, matope owongolera pansi, ndi zina zambiri.
Kugwiritsa ntchito mphamvu ya cellulose ether
Ma cellulose ethersamagwiritsidwa ntchito kwambiri mumatope ochita bwino kwambiri, zomatira matailosi, zida zopangidwa ndi gypsum komanso makina otchinjiriza akunja. Kukula kwake kwapamwamba komanso kusungirako madzi kumatha kupititsa patsogolo mphamvu zomangirira komanso zotsutsana ndi zinthuzo, ndipo ndizofunikira kwambiri pama projekiti omwe ali ndi zofunika kwambiri pakumanga ndi kumalizidwa kwazinthu.
4. Mtengo ndi kuteteza chilengedwe
mtengo:
HPS ili ndi mtengo wotsika ndipo ndiyoyenera kugwiritsidwa ntchito m'misika yotsika mtengo. Ma cellulose ethers ndi okwera mtengo, koma amagwira ntchito bwino kwambiri ndipo ndi otsika mtengo pantchito yomanga yomwe ikufunika.
Chitetezo cha chilengedwe:
Zonsezi zimachokera ku zinthu zachilengedwe ndipo zimakhala ndi chilengedwe chabwino. Komabe, chifukwa ma reagents ocheperako amadyedwa popanga HPS, zovuta zake zachilengedwe zitha kukhala zotsika.
5. Kusankha maziko
Zofunikira pakugwira ntchito: Ngati muli ndi zofunika kwambiri pakukulitsa ndi kusunga madzi, muyenera kusankha cellulose ether; pazida zomwe zimakhala zotsika mtengo koma zimafunikira kuwongolera kwina kwa magwiridwe antchito, mutha kulingalira kugwiritsa ntchito HPS.
Zochitika zogwiritsira ntchito: Kumanga kwa kutentha kwakukulu, kutsekemera kwa khoma lakunja, zomatira matayala ndi zochitika zina zomwe zimafuna chithandizo chapamwamba ndizoyenera kwambiri ku cellulose ether; Kwa wamba wamba wamkati khoma putty kapena matope oyambira, HPS imatha kupereka mayankho azachuma komanso othandiza.
Hydroxypropyl wowuma etherndicellulose ether aliyense ali ndi ubwino wake ndipo amagwira ntchito zosiyanasiyana pa zipangizo zomangira. Kusankhidwa kuyenera kuganiziridwa mozama malinga ndi zofunikira za ntchito, kuwongolera mtengo, malo omangamanga ndi zinthu zina za polojekitiyi kuti akwaniritse ntchito yabwino.
Nthawi yotumiza: Nov-21-2024