Na boleng ba cellulose HPMC bo lekanya boleng ba seretse?

Ka seretse se seng se lokiselitsoe, palo e ekelitsoeng ea hydroxypropyl methyl cellulose HPMC e tlase haholo, empa e ka ntlafatsa haholo ts'ebetso ea seretse se metsi, e leng tlatsetso e kholo e amang ts'ebetso ea kaho ea seretse.Li-cellulose ethers tse nang le viscosity e fapaneng le palo e ekelitsoeng li na le phello e ntle ntlafatsong ea ts'ebetso ea seretse se omileng.Hajoale, liretse tse ngata tsa masonry le plastering li na le thepa e mpe ea ho boloka metsi, 'me karohano ea seretse sa metsi e etsahala kamora metsotso e seng mekae e eme.Ho boloka metsi ke ts'ebetso ea bohlokoa ea methyl cellulose ether, hape ke ts'ebetso eo bahlahisi ba bangata ba seretse se ommeng malapeng, haholo-holo ba libakeng tse nang le mocheso o phahameng ka boroa, ba e ela hloko.Lintlha tse amang phello ea ho boloka metsi ea seretse se omileng li kenyelletsa palo ea HPMC e ekelitsoeng, viscosity ea HPMC, botle ba likaroloana le mocheso oa tikoloho eo e sebelisoang ho eona.

1. Khopolo: Cellulose ether ke polymer ea maiketsetso e phahameng ea molek'hule e entsoeng ka selulose ea tlhaho ka phetoho ea lik'hemik'hale.Cellulose ether e tsoa ho cellulose ea tlhaho.Tlhahiso ea cellulose ether e fapane le li-polymers tsa maiketsetso.Thepa ea eona ea mantlha ke cellulose, motsoako oa tlhaho oa polymer.Ka lebaka la sebopeho se khethehileng sa cellulose ea tlhaho, selulose ka boeona ha e na bokhoni ba ho itšoara ka li-etherifying agents.Empa ka mor'a hore moemeli oa ho ruruha a phekoloe, maqhama a matla a hydrogen pakeng tsa liketane tsa molek'hule le ka har'a ketane lia senyeha, 'me ho lokolloa ka mafolofolo ha sehlopha sa hydroxyl ho fetoha selulose e sebetsang ea alkali.Kamora hore moemeli oa etherification a arabele, sehlopha sa -OH se fetoleloa ho -OR sehlopha.Fumana ether ea cellulose.Sebopeho sa cellulose ether se ipapisitse le mofuta, bongata le kabo ea li-substitute.Ho hlophisoa ha cellulose ethers ho boetse ho ipapisitse le mefuta ea li-substituent, tekanyo ea etherification, solubility le lits'ebetso tse amanang.Ho ea ka mofuta oa li-substituents ka ketane ea molek'hule, e ka aroloa ka monoether le ether e tsoakiloeng.HPMC eo re e sebelisang hangata ke ether e tsoakiloeng.Hydroxypropyl methyl cellulose ether HPMC ke sehlahisoa seo karolo ea sehlopha sa hydroxyl ho yuniti e nkeloang sebaka ke sehlopha sa methoxy mme karolo e 'ngoe e nkeloa sebaka ke sehlopha sa hydroxypropyl.HPMC e sebelisoa haholo-holo ka thepa ea mohaho, liphahlo tsa latex, meriana, k'hemistri ea letsatsi le letsatsi, joalo-joalo E sebelisoa e le setsi se seholo, se bolokang metsi, se tsitsitseng, se dispersant, le moemeli oa ho etsa lifilimi.

2.Ho boloka metsi a cellulose ether: tlhahiso ea thepa ea mohaho, haholo-holo seretse se omeletseng, cellulose ether e phetha karolo e ke keng ea nkeloa sebaka, haholo-holo tlhahiso ea seretse se khethehileng (seretse se fetotsoeng), ke sa bohlokoa haholo.karolo.Karolo ea bohlokoa ea cellulose ether e qhibilihang ka metsi ka seretseng e haholo-holo ka likarolo tse tharo.E 'ngoe ke bokhoni bo babatsehang ba ho boloka metsi, e' ngoe ke tšusumetso ea ho lumellana le thixotropy ea seretse, 'me ea boraro ke ho sebelisana le samente.Matla a ho boloka metsi a cellulose ether a ipapisitse le ho monya ha metsi a lera la motheo, sebopeho sa seretse, botenya ba seretse, tlhokeho ea metsi ea seretse, le nako ea ho beoa ha seretse.Ho boloka metsi ha cellulose ether ka boeona ho tsoa ho solubility le dehydration ea cellulose ether ka boeona.

the thickening le thixotropy ea cellulose ether: Karolo ea bobeli ea cellulose ether-thickening e itšetlehile ka: tekanyo ea polymerization ea cellulose ether, mahloriso a tharollo, mocheso le maemo a mang.Thepa ea gelation ea tharollo ke thepa e ikhethang ea alkyl cellulose le lihlahisoa tsa eona tse fetotsoeng.Litšobotsi tsa gelation li amana le tekanyo ea ho fetola, mahloriso a tharollo le li-additives.

 

Bokhoni bo botle ba ho boloka metsi bo etsa hore hydration ea samente e be e phethehileng haholoanyane, e ka ntlafatsa tackiness e metsi ea seretse se metsi, ho eketsa matla a tlamahano ea seretse, 'me nako e ka fetoloa.Ho eketsoa ha cellulose ether ho seretse sa ho fafatsa ka mochini ho ka ntlafatsa ts'ebetso ea ho fafatsa kapa ho pompa seretse, hammoho le matla a sebopeho.Ka hona, ether ea cellulose e sebelisoa haholo e le tlatsetso ea bohlokoa ka har'a seretse se seng se kopantsoe.


Nako ea poso: Dec-16-2021