Kakaretso:Bakeng sa ho nkela sebaka sa non-degradable polyvinyl alcohol (PVA) slurry, hemp stalk cellulose ether-hydroxypropyl methylcellulose e ile ea lokisoa ho tloha mahlakang a litšila a temo ea hemp, 'me e kopantsoe le starch e khethehileng ho lokisa slurry. Khoele e kopantsoeng ea polyester-cotton T/C65/35 14.7 tex e ne e le boholo bo boholo 'me boholo ba eona bo ile ba lekoa. Mokhoa o nepahetseng oa tlhahiso ea hydroxypropyl methylcellulose e ne e le ka tsela e latelang: karolo e kholo ea li-lye e ne e le 35%; tekanyo ea khatello ea selulose ea alkali e ne e le 2,4; Karo-karolelano ea metsi a methane le propylene oxide ke 7: 3; hlapolla ka isopropanol; khatello ea maikutlo ke 2. 0MPa. Boholo bo lokiselitsoeng ka ho kopanya hydroxypropyl methylcellulose le starch e itseng e na le COD e tlase ebile e na le botsoalle ho tikoloho, 'me matšoao ohle a boholo a ka nka sebaka sa boholo ba PVA.
Mantsoe a bohlokoa:lehlaka la hemp; hemp stalk cellulose ether; joala ba polyvinyl; tekanyo ea cellulose ether
0.Selelekela
China ke e 'ngoe ea linaha tse nang le mehloli e mengata ea litlhaka. Lihlahisoa tsa lijalo li feta lithane tse limilione tse 700, 'me sekhahla sa tšebeliso ea joang ke 3% feela selemo se seng le se seng. Mehloli e mengata ea litlhaka ha e so sebelisoe. Lehlaka ke thepa e tala ea tlhaho ea lignocellulosic, e ka sebelisoang ho fepa, manyolo, lihlahisoa tsa cellulose le lihlahisoa tse ling.
Hajoale, ho hana tšilafalo ea metsi a litšila tšebetsong ea tlhahiso ea masela e se e le e 'ngoe ea mehloli e meholohali ea tšilafalo. Tlhokahalo ea oksijene ea lik'hemik'hale ea PVA e phahame haholo. Ka mor'a hore metsi a litšila a indasteri a hlahisoang ke PVA ka mokhoa oa khatiso le ho daea a tšeloa ka nōkeng, e tla thibela kapa hona ho senya phefumoloho ea lintho tse phelang metsing. Ho feta moo, PVA e mpefatsa ho lokolloa le ho falla ha litšepe tse boima ka har'a sediments ka metsing, e bakang mathata a tebileng a tikoloho. Ho etsa lipatlisiso mabapi le ho nkela PVA sebaka ka slurry e tala, ha ho hlokahale feela ho fihlela litlhoko tsa ts'ebetso ea boholo, empa hape le ho fokotsa tšilafalo ea metsi le moea nakong ea ts'ebetso ea boholo.
Thutong ena, hemp stalk cellulose ether-hydroxypropyl methylcellulose (HPMC) e ile ea lokisoa ho tsoa mahlakang a litšila a temo, 'me ho ile ha buisanoa ka tšebetso ea eona ea tlhahiso. 'Me kopanya hydroxypropyl methylcellulose le boholo bo ikhethileng ba starch e le boholo ba boholo, bapisa le boholo ba PVA,' me u buisane ka ts'ebetso ea eona ea boholo.
1. Teko
1 . 1 Lisebelisoa le lisebelisoa
Lehlaka la Hemp, Heilongjiang; polyester-cotton blended khoele T/C65/3514.7 tex; e iketselitseng hemp stalk cellulose ether-hydroxypropyl methylcellulose; FS-101, starch e fetotsoeng, PVA-1799, PVA-0588, Liaoning Zhongze Group Chaoyang Textile Co., Ltd.; propanol, premium grade; propylene oxide, glacial acetic acid, sodium hydroxide, isopropanol, analytically pure; methyl chloride, naetrojene e hloekileng haholo.
GSH-3L reaction kettle, JRA-6 dijithale pontsho ya dijithale tse hlasimollang metsi a hlapang, DHG-9079A mocheso o futhumatsang o sa feleng oa ontong ea ho omisa, IKARW-20 overhead mechanical agitator, ESS-1000 sampole sa size, YG 061/PC electronic single khoele matla mitha , LFY-109B sehlahlobi sa khoele ea khoele ea khoele ea khoele.
1.2 Tokisetso ea hydroxypropyl methylcellulose
1. 2. 1 Tokisetso ea alkali fiber
Arola kutu ea hemp, e silakanye ho 20 meshes ka pulverizer, eketsa phofo ea stalk ea hemp ho 35% ea metsi a NaOH a metsi, 'me u e inele mocheso oa kamore bakeng sa 1. 5 ~ 2 . 0h. Penya fiber ea alkali e kentsoeng e le hore karo-karolelano ea boima ba alkali, selulose le metsi e be 1. 2:1. 2:1.
1. 2. 2 Etherification reaction
Lahlela selulose ea alkali e lokisitsoeng ka har'a ketlele ea ho arabela, eketsa 100 ml ea isopropanol e le diluent, eketsa mokelikeli 140 ml ea methyl chloride le 60 ml ea propylene oxide, vacuumize, 'me u hatelle ho 2. 0 MPa, butle-butle phahamisa mocheso ho 45 ° C bakeng sa lihora tse 1-2, 'me u arabe ka 75 ° C bakeng sa lihora tse 1-2 ho lokisetsa hydroxypropyl methylcellulose.
1. 2. 3 Ka mor'a ts'ebetso
Fetola pH ea etherified cellulose ether ka glacial acetic acid ho 6 . 5 ~ 7 . 5, e hlatsuoa ka propanol ka makhetlo a mararo, 'me e omisitsoe ka ontong ka 85 ° C.
1.3 Ts'ebetso ea tlhahiso ea hydroxypropyl methylcellulose
1. 3. 1 Tšusumetso ea lebelo la ho potoloha ha ho lokisoa ha cellulose ether
Hangata karabelo ea etherification ke karabelo e fapaneng ho tloha kahare ho ea kahare. Haeba ho se na matla a ka ntle, ho thata hore moemeli oa etherification a kene ka har'a crystallization ea selulose, kahoo ho hlokahala hore u kopane ka botlalo le moemeli oa etherification le selulose ka ho susumetsa. Thutong ena, ho ile ha sebelisoa mochine o matla oa khatello e matla. Ka mor'a liteko tse pheta-phetoang le lipontšo, lebelo le khethiloeng la ho potoloha e ne e le 240-350 r/min.
1. 3. 2 Phello ea khatello ea alkali ho lokisoeng ha cellulose ether
Alkali e ka senya sebopeho sa compact sa selulose ho etsa hore e ruruhe, 'me ha ho ruruha ha sebaka sa amorphous le sebaka sa crystalline se atisa ho lumellana, etherification e tsoela pele hantle. Ts'ebetsong ea tlhahiso ea cellulose ether, palo ea alkali e sebelisoang ts'ebetsong ea cellulose alkalization e na le tšusumetso e kholo ho katleho ea etherification ea lihlahisoa tsa etherification le tekanyo ea ho fetola lihlopha. Ha ho etsoa litokisetso tsa hydroxypropyl methylcellulose, ha motsoako oa lye o ntse o eketseha, litaba tsa lihlopha tsa methoxyl le tsona lia eketseha; ka lehlakoreng le leng, ha motsoako oa lye o fokotseha, hydroxypropyl methylcellulose Litaba tsa motheo li kholoanyane. Likahare tsa sehlopha sa methoxy li lekana ka ho toba le mokoloko oa lye; dikahare tsa hydroxypropyl di lekane ka tsela e fapaneng le kgatello ya lye. Karolo e kholo ea NaOH e khethiloe e le 35% ka mor'a liteko tse pheta-phetoang.
1. 3. 3 Phello ea alkali cellulose pressing ratio ho lokisoa ha cellulose ether
Sepheo sa ho hatella alkali fiber ke ho laola metsi a alkali cellulose. Ha tekanyo ea ho hatella e le nyane haholo, metsi a eketseha, motsoako oa lye oa fokotseha, tekanyo ea etherification ea fokotseha, 'me moemeli oa etherification o na le hydrolyzed' me likarabo tsa mahlakoreng lia eketseha. , ts'ebetso ea etherification e fokotsehile haholo. Ha tekanyo ea khatello e le khōlō haholo, metsi a fokotseha, selulose e ke ke ea ruruha, 'me ha e na reactivity,' me moemeli oa etherification ha a khone ho kopana ka botlalo le selulose ea alkali, 'me karabelo ha e lekane. Ka mor'a liteko tse ngata le lipapiso tse hatellang, ho ile ha etsoa qeto ea hore karolelano ea boima ba alkali, metsi le cellulose e ne e le 1. 2: 1. 2:1.
1. 3. 4 Phello ea mocheso ho lokisoeng ha cellulose ether
Ha u ntse u lokisetsa hydroxypropyl methylcellulose, qala ka ho laola mocheso ho 50-60 ° C 'me ue boloke ka mocheso o sa khaotseng oa lihora tse peli. Karabelo ea hydroxypropylation e ka etsoa hoo e ka bang 30 ℃, mme sekhahla sa karabelo ea hydroxypropylation se eketseha haholo ho 50 ℃; butle-butle phahamisa mocheso ho 75 ℃, 'me u laole mocheso oa lihora tse peli. Ka 50 ° C, karabelo ea methylation ha e sebetse, ka 60 ° C, tekanyo ea ho arabela e lieha, 'me ka 75 ° C, tekanyo ea methylation e potlakisa haholo.
Tokisetso ea hydroxypropyl methylcellulose e nang le taolo ea mocheso oa mekhahlelo e mengata e ke ke ea laola feela ho leka-lekana ha lihlopha tsa methoxyl le hydroxypropyl, empa hape e thusa ho fokotsa maikutlo a mahlakoreng le ka mor'a phekolo, le ho fumana lihlahisoa tse nang le sebopeho se utloahalang.
1. 3. 5 Phello ea etherification agent dosage ratio ho lokisoa ha cellulose ether
Kaha hydroxypropyl methylcellulose ke ether e sa tloaelehang e tsoakiloeng e seng ionic, lihlopha tsa methyl le hydroxypropyl li nkeloa sebaka ke liketane tse fapaneng tsa hydroxypropyl methylcellulose macromolecular, ke hore, C e fapaneng sebakeng se seng le se seng sa lesale la tsoekere. Ka lehlakoreng le leng, karo-karolelano ea kabo ea methyl le hydroxypropyl e na le phallo e kholo le ho ba le maemo. Sollubility ea metsi ea HPMC e amana le litaba tsa sehlopha sa methoxy. Ha litaba tsa sehlopha sa methoxy li le tlase, li ka qhibiliha ka alkali e matla. Ha litaba tsa methoxyl li ntse li eketseha, e ba bonolo haholoanyane ho ruruha ha metsi. Ha methoxy e phahame, e etsa hore metsi a qhibilihe hantle, 'me a ka etsoa hore e be seretse.
Palo ea etherifying agent methyl chloride le propylene oxide e na le tšusumetso e tobileng ho litaba tsa methoxyl le hydroxypropyl. Bakeng sa ho lokisa hydroxypropyl methylcellulose ka ho qhibiliha ha metsi hantle, tekanyo ea metsi ea methyl chloride le propylene oxide e khethiloe e le 7: 3.
1.3.6 Mokhoa o nepahetseng oa tlhahiso ea hydroxypropyl methylcellulose
The itsoara joang ka thepa ke phahameng-khatello a tsosoa pompo; lebelo la ho potoloha ke 240-350 r / min; karolo ea boima ba lye ke 35%; tekanyo ea compression ea alkali cellulose ke 2. 4; Hydroxypropoxylation ka 50 ° C bakeng sa lihora tsa 2, methoxylation ho 75 ° C bakeng sa lihora tsa 2; etherification agent methyl chloride le propylene oxide liquid volume ratio 7:3; vacuum; khatello 2 . 0 MPa; Sehlahisoa ke isopropanol.
2. Ho fumanoa le tšebeliso
2.1 SEM ea hemp cellulose le alkali cellulose
Ha ho bapisoa selulose ea hemp e sa phekoloang le selulose ea hemp e phekoloang ka 35% NaOH, ho ka fumanoa ka ho hlaka hore selulose ea alkalize e na le mapetsong a mangata, sebaka se seholoanyane, ts'ebetso e phahameng le karabelo e bonolo ea etherification.
2.2 Boikemisetso ba Infrared Spectroscopy
Selulose e ntšitsoeng mahlakang a hemp ka mor'a ho phekoloa le ponahalo ea infrared ea HPMC e lokisitsoeng ho tloha selulose ea stalk stalk. Har'a tsona, sehlopha se matla le se pharaletseng sa ho monya ho 3295 cm -1 ke sehlopha sa ho monya se otlolohileng sa sehlopha sa HPMC sa hydroxyl, sehlopha sa ho monya ho 1250 ~ 1460 cm -1 ke sehlopha sa ho monya CH, CH2 le CH3, le ho monya. sehlopha sa 1600 cm -1 ke sehlopha sa ho monya metsi ka har'a sehlopha sa polymer absorption. Sehlopha sa ho monya ho 1025cm -1 ke sehlopha sa ho monya sa C - O - C ho polymer.
2.3 Boikemisetso ba viscosity
Nka sampole e lokisitsoeng ea cannabis stalk cellulose ether 'me u e kenye beaker ho lokisa tharollo e nang le metsi a 2%, e sisinye hantle, lekanya viscosity le viscosity botsitso ka viscometer,' me u lekanye viscosity e tloaelehileng makhetlo a 3. Viscosity ea sampole e lokisitsoeng ea cannabis stalk cellulose ether e ne e le 11. 8 mPa·s.
2.4 Sesebelisoa sa boholo
2.4.1 Sebopeho sa Slurry
The slurry e ne e lokiselitsoe ka 1000mL ea slurry e nang le karoloana e boima ea 3.5%, e tsosoa ka mokhoa o ts'oanang le mixer, ebe e kenngoa ka bateng ea metsi ebe e futhumatsoa ho 95 ° C bakeng sa 1 h. Ka nako e ts'oanang, hlokomela hore setshelo sa ho pheha makhasi se lokela ho koaloa hantle ho thibela khatello ea slurry ho eketseha ka lebaka la mouoane oa metsi.
2.4.2 Ho hlahisa seretse pH, miscibility le COD
Kopanya hydroxypropyl methyl cellulose le boholo bo itseng ba starch ho lokisa slurry (1#~4#), 'me u bapise le PVA formula slurry (0#) ho hlahloba pH, miscibility le COD. Khoele e kopaneng ea polyester-cotton T/C65/3514.7 tex e ne e lekantsoe mochining oa sampole oa ESS1000, mme ts'ebetso ea eona ea boholo e ile ea hlahlojoa.
Ho ka bonoa hore hemp stalk cellulose ether e entsoeng hae le boholo bo itseng ba starch 3 # ke sebopeho se nepahetseng sa boholo: 25% hemp stalk cellulose ether, 65% e fetotsoeng starch le 10% FS-101.
Lintlha tsohle tsa boholo li bapisoa le lintlha tsa boholo ba PVA, tse bontšang hore boholo bo tsoakiloeng ba hydroxypropyl methylcellulose le starch e khethehileng e na le tshebetso e ntle ea boholo; pH ea eona e haufi le ho se nke lehlakore; hydroxypropyl methylcellulose le starch e khethehileng COD (17459.2 mg / L) ea boholo bo itseng bo tsoakiloeng ba starch e ne e le tlase haholo ho feta ea boholo ba PVA (26448.0 mg / L), 'me ts'ebetso ea ts'ireletso ea tikoloho e ne e le ntle.
3. Qetello
Ts'ebetso e nepahetseng ea tlhahiso bakeng sa ho lokisa selulose ea hemp stalk ether-hydroxypropyl methylcellulose bakeng sa boholo ke e latelang: mochini o matla o matla o matla o nang le lebelo la ho potoloha la 240-350 r/min, karolo e boima ea lye ea 35%, le tekanyo ea khatello. ea alkali cellulose 2.4, mocheso oa methylation ke 75 ℃, 'me mocheso oa hydroxypropylation ke 50 ℃, e' ngoe le e 'ngoe e bolokiloe lihora tse 2, tekanyo ea metsi ea methyl chloride le propylene oxide ke 7: 3, vacuum, khatello ea karabelo ke 2.0 MPa, isopropanol ke ntho e hlapollang.
Hemp stalk cellulose ether e ile ea sebelisoa ho nkela boholo ba PVA bakeng sa boholo, 'me tekanyo e nepahetseng ea boholo e ne e le: 25% hemp stalk cellulose ether, 65% modified starch le 10% FS‐101. PH ea slurry ke 6.5 le COD (17459.2 mg / L) e tlaase haholo ho feta ea PVA slurry (26448.0 mg / L), e bontšang ts'ebetso e ntle ea tikoloho.
Hemp stalk cellulose ether e ne e sebelisoa bakeng sa boholo sebakeng sa boholo ba PVA ho lekanngoa le khoele e kopantsoeng ea polyester-cotton T/C 65/3514.7tex. Index ea boholo e ea lekana. Hemp stalk cellulose ether e ncha le boholo bo fetotsoeng ba starch bo ka nka sebaka sa boholo ba PVA.
Nako ea poso: Feb-20-2023