Focus on Cellulose ethers

Ukulungiswa kobungakanani be-hemp stalk cellulose ether kunye nokusetyenziswa kwayo ekulinganisweni

Inkcazo:Ukuze kubuyiselwe i-polyvinyl alcohol engaboliyo (PVA) slurry, i-hemp stalk cellulose ether-hydroxypropyl methylcellulose yalungiswa ukusuka kwizikhondo zenkunkuma ye-hemp yezolimo, kwaye ixutywe nesitatshi esikhethekileyo ukulungisa uludaka. Umsonto odityanisiweyo wePolyester-cotton T/C65/35 14.7 tex wawunobungakanani kunye nokusebenza kwawo komgangatho wavavanywa. Eyona nkqubo yokuvelisa i-hydroxypropyl methylcellulose yayimi ngolu hlobo lulandelayo: ubukhulu beqhekeza le-lye yayingu-35%; i-compression ratio ye-alkali cellulose yayiyi-2.4; Umlinganiselo womthamo we-liquid we-methane kunye ne-propylene oxide ngu-7: 3; nciphisa nge-isopropanol; uxinzelelo lokuphendula luyi-2. 0MPa Ubungakanani obulungiselelwe ngokuxuba i-hydroxypropyl methylcellulose kunye nesitashi esithile sine-COD ephantsi kwaye ihambelana nokusingqongileyo, kwaye zonke izikhombisi zokulinganisa zinokuthatha indawo yobungakanani bePVA.

Amagama angundoqo:isiqu se-hemp; i-hemp stalk cellulose ether; utywala polyvinyl; Ubungakanani be-cellulose ether

0.Intshayelelo

I-China lelinye lamazwe anobutyebi be-straw obutyebileyo. Imveliso yesityalo ingaphezulu kwe-700 yezigidi zeetoni, kwaye izinga lokusetyenziswa kweendiza li-3% kuphela ngonyaka. Isixa esikhulu semithombo yeendiza ayikasetyenziswa. I-straw sisityebi se-lignocellulosic yendalo ekrwada, enokusetyenziswa kwisondlo, isichumisi, i-cellulose derivatives kunye nezinye iimveliso.

Okwangoku, ukukhutshwa kongcoliseko lwamanzi amdaka kwinkqubo yokuvelisa ilaphu kuye kwaba ngowona mthombo mkhulu wongcoliseko. Imfuno yeoksijini yeekhemikhali yePVA iphezulu kakhulu. Emva kokuba amanzi amdaka amashishini aveliswa yi-PVA kwinkqubo yokuprinta kunye nokudaya ikhutshwe emlanjeni, iya kuthintela okanye itshabalalise ukuphefumla kwezinto eziphilayo zasemanzini. Ngapha koko, i-PVA yenza mandundu ukukhululwa kunye nokufuduka kwesinyithi esinzima kwintlenga kwimizimba yamanzi, nto leyo ebangela iingxaki ezinzulu zokusingqongileyo. Ukwenza uphando ngokutshintsha i-PVA nge-slurry eluhlaza, akufuneki kuphela ukuhlangabezana neemfuno zenkqubo yokulinganisa, kodwa kunye nokunciphisa ukungcoliswa kwamanzi kunye nomoya ngexesha lenkqubo yokulinganisa.

Kolu phononongo, i-hemp stalk cellulose ether-hydroxypropyl methylcellulose (HPMC) yalungiswa ukusuka kwizikhondo zenkunkuma yezolimo, kwaye inkqubo yayo yokuvelisa yaxoxwa. Kwaye xuba i-hydroxypropyl methylcellulose kunye nesayizi ethile yesitatshi njengobungakanani bokulinganisa, thelekisa nobungakanani bePVA, kwaye uxoxe ngokusebenza kwayo.

1. Linge

1 1 Izixhobo kunye nezixhobo

Isikhondo seHemp, iHeilongjiang; i-polyester-cotton edibeneyo intambo T / C65 / 3514.7 tex; uzenzele we-hemp stalk cellulose ether-hydroxypropyl methylcellulose; I-FS-101, isitashi esilungisiweyo, i-PVA-1799, i-PVA-0588, i-Liaoning Zhongze Group Chaoyang Textile Co., Ltd.; ipropanol, ibakala leprimiyamu; ipropylene oxide, i-glacial acetic acid, i-sodium hydroxide, i-isopropanol, i-analytically pure; i-methyl chloride, i-nitrogen ephezulu.

Iketile yokusabela ye-GSH-3L, i-JRA-6 idijithali ibonisa idijithi yokuhlambela ngamanzi, i-DHG-9079A yokufudumeza kombane rhoqo ubushushu be-oveni yokomisa, i-IKARW-20 i-agitator yomatshini engaphezulu, i-ESS-1000 umatshini wokulinganisa isampulu, YG 061/PC imitha yamandla yomsonto omnye we-elektroniki, I-LFY-109B yokuvavanya umsonto wekhompyutha.

1.2 Ukulungiswa kwe-hydroxypropyl methylcellulose

1. 2. 1 Ukulungiswa kwefiber alkali

Hlukanisa i-hemp stalk, uyiqhekeze ibe yi-20 meshes nge-pulverizer, yongeza i-hemp stalk powder kwi-35% ye-NaOH ye-aqueous solution, kwaye uyicwilise kwiqondo lokushisa kwe-1. 5 ~ 2. 0 h. Cofa ifayibha yealkali efakiweyo ukuze ubungakanani be-alkali, i-cellulose kunye namanzi bube yi-1. 2:1. 2:1.

1. 2. 2 Ukusabela kwe-Etherification

Phonsa i-alkali cellulose elungiselelwe kwi-kettle yokusabela, yongeza i-100 mL ye-isopropanol njenge-diluent, yongeza i-liquid 140 mL ye-methyl chloride kunye ne-60 mL ye-propylene oxide, i-vacuumze, kwaye icinezele kwi-2. 0 MPa, ngokukhawuleza uphakamise ubushushu ukuya kwi-45 ° C kwiiyure ze-1-2, kwaye uphendule kwi-75 ° C kwiiyure ze-1-2 ukulungiselela i-hydroxypropyl methylcellulose.

1. 2. 3 Emva kokulungiswa

Lungisa i-pH ye-etherified cellulose ether kunye ne-glacial acetic acid ukuya kwi-6. 5 ~ 7. 5, ihlanjwe ngepropanol kathathu, kwaye yomiswe kwi-oven kwi-85 ° C.

1.3 Inkqubo yokuvelisa i-hydroxypropyl methylcellulose

1. 3. 1 Impembelelo yesantya sokujikeleza ekulungiseleleni i-cellulose ether

Ngokuqhelekileyo i-etherification reaction yi-heterogeneous reaction ukusuka ngaphakathi ukuya ngaphakathi. Ukuba akukho mandla angaphandle, kunzima ukuba i-agent etherification ingene kwi-crystallization ye-cellulose, ngoko ke kuyimfuneko ukudibanisa ngokupheleleyo i-etherification agent kunye ne-cellulose ngendlela yokuvuselela. Kolu phononongo, kusetyenziswe i-reactor yoxinzelelo oluphezulu. Emva kovavanyo oluphindaphindiweyo kunye nemiboniso, isantya esikhethiweyo sokujikeleza sasiyi-240-350 r / min.

1. 3. 2 Isiphumo sokugxilwa kwe-alkali ekulungiseleleni i-cellulose ether

I-alkali inokutshabalalisa i-compact structure ye-cellulose ukuze idumbe, kwaye xa ukuvuvukala kwendawo ye-amorphous kunye nommandla we-crystalline uvame ukuhambelana, i-etherification ihamba kakuhle. Kwinkqubo yokuvelisa i-cellulose ether, inani le-alkali elisetyenziswe kwinkqubo ye-cellulose alkalization inempembelelo enkulu ekusebenzeni kwe-etherification yeemveliso ze-etherification kunye neqondo lokutshintshwa kwamaqela. Kwinkqubo yokulungiselela i-hydroxypropyl methylcellulose, njengoko ukuxinwa kwe-lye kwanda, umxholo wamaqela e-methoxyl nawo uyanda; ngokuchaseneyo, xa i-concentration ye-lye iyancipha, i-hydroxypropyl methylcellulose Umxholo wesiseko mkhulu. Umxholo weqela le-methoxy uhambelana ngokuthe ngqo kwi-concentration ye-lye; Umxholo we-hydroxypropyl uhambelana ngokuphambeneyo noxinaniso lwe-lye. Inxalenye enkulu ye-NaOH ikhethwe njenge-35% emva kovavanyo oluphindaphindiweyo.

1. 3. 3 Ifuthe le-alkali cellulose pressing ratio ekulungiseleleni i-cellulose ether

Injongo yokucinezela i-alkali fiber kukulawula umxholo wamanzi we-alkali cellulose. Xa umlinganiselo wokucinezela uncinci kakhulu, umthamo wamanzi uyanda, ukuxinwa kwe-lye kuncipha, izinga le-etherification liyancipha, kwaye i-etherification agent i-hydrolyzed kunye neempendulo zecala zanda. , ukusebenza kwe-etherification kuyancipha kakhulu. Xa umlinganiselo wokucinezela ukhulu kakhulu, umthamo wamanzi uyancipha, i-cellulose ayikwazi ukudumba, kwaye ayinayo i-reactivity, kwaye i-etherification agent ayikwazi ukudibanisa ngokupheleleyo ne-alkali cellulose, kwaye ukusabela akulingani. Emva kweemvavanyo ezininzi kunye nokucinezela uthelekiso, kwagqitywa ukuba umlinganiselo we-alkali, amanzi kunye ne-cellulose wawuyi-1. 2: 1. 2:1.

1. 3. 4 Impembelelo yobushushu ekulungiseleleni i-cellulose ether

Kwinkqubo yokulungiselela i-hydroxypropyl methylcellulose, lawula kuqala ubushushu kwi-50-60 ° C kwaye uyigcine kwiqondo lokushisa elingaguqukiyo kwiiyure ezi-2. Ukusabela kwe-hydroxypropylation kunokwenziwa malunga ne-30 ℃, kwaye izinga le-hydroxypropylation reaction rate linyuka kakhulu kwi-50 ℃; nyusa kancinci iqondo lobushushu ukuya kuma 75 ℃, kwaye ulawule ubushushu iiyure ezi-2. Kwi-50 ° C, i-methylation reaction ayinakwenzeka, kwi-60 ° C, izinga lokuphendula licotha, kwaye kwi-75 ° C, i-methylation reaction rate ikhawuleza kakhulu.

Ukulungiswa kwe-hydroxypropyl methylcellulose kunye nolawulo lweqondo lokushisa oluninzi alikwazi ukulawula kuphela ibhalansi ye-methoxyl kunye namaqela e-hydroxypropyl, kodwa kunceda ukunciphisa ukuphendulwa kwecala kunye nokunyanga emva kokunyanga, kunye nokufumana iimveliso ezinesakhiwo esifanelekileyo.

1. 3. 5 Isiphumo somlinganiselo wedosi ye-etherification agent kulungiselelo lwe-cellulose ether.

Ekubeni i-hydroxypropyl methylcellulose iyi-ether exubeneyo engeyo-ionic eqhelekileyo, amaqela e-methyl kunye ne-hydroxypropyl afakwa endaweni yamatyathanga e-hydroxypropyl methylcellulose macromolecular, oko kukuthi, i-C eyahlukileyo kwindawo nganye yeringi yeglucose. Kwelinye icala, umlinganiselo wokuhanjiswa kwe-methyl kunye ne-hydroxypropyl inokusasazwa okukhulu kunye nokungakhethi. Ukunyibilika kwamanzi kwe-HPMC kuhambelana nomxholo weqela le-methoxy. Xa umxholo weqela le-methoxy liphantsi, linokuchithwa kwi-alkali enamandla. Njengoko umxholo we-methoxyl usanda, uba novelwano ngakumbi ekudumbeni kwamanzi. Ukuphakama komxholo we-methoxy, ngcono ukunyibilika kwamanzi, kwaye inokuqulunqwa ibe ludaka.

Isixa se-etherifying agent methyl chloride kunye nepropylene oxide inempembelelo ngqo kumxholo we-methoxyl kunye ne-hydroxypropyl. Ukuze kulungiswe i-hydroxypropyl methylcellulose kunye nokunyibilika kakuhle kwamanzi, umlinganiselo wevolumu ye-methyl chloride kunye nepropylene oxide ikhethwe njenge-7: 3.

1.3.6 Eyona nkqubo yokuvelisa i-hydroxypropyl methylcellulose

Isixhobo sokusabela yi-high-pressure yavuselelwa ireactor; isantya sokujikeleza yi-240-350 r / min; ubukhulu beqhekeza le-lye yi-35%; i-compression ratio ye-alkali cellulose yi-2. 4; I-Hydroxypropoxylation kwi-50 ° C kwiiyure ze-2, i-methoxylation kwi-75 ° C kwiiyure ze-2; i-etherification agent methyl chloride kunye nepropylene oxide liquid volume ratio 7: 3; ivacuum; uxinzelelo lwe-2. 0 MPa; idiluent yi isopropanol.

2. Ukufunyanwa kunye nesicelo

2.1 I-SEM ye-hemp cellulose kunye ne-alkali cellulose

Ukuthelekisa i-cellulose ye-hemp engaphathwanga kunye ne-hemp cellulose ephathwa nge-35% ye-NaOH, kunokufunyaniswa ngokucacileyo ukuba i-alkalized cellulose ineentanda ezingaphezulu, indawo enkulu, umsebenzi ophezulu kunye nokuphendula okulula kwe-etherification.

2.2 Ukumiselwa kwe-Infrared Spectroscopy

Iselulosi ekhutshwe kwizikhondo ze-hemp emva konyango kunye ne-infrared spectrum ye-HPMC elungiswe kwi-hemp stalk cellulose. Phakathi kwazo, ibhendi yokufunxa eyomeleleyo kunye ebanzi kwi-3295 cm -1 yibhendi yokufunxa eyolulayo yeqela le-HPMC yombutho we-hydroxyl, ibhendi yokufunxa kwi-1250 ~ 1460 cm -1 yibhendi yokufunxa ye-CH, CH2 kunye ne-CH3, kunye ne-absorption. ibhendi kwi-1600 cm -1 yibhendi yokufunxa yamanzi kwibhanti yokufunxa i-polymer. Ibhendi yokufunxa kwi-1025cm -1 yibhendi yokufunxa ye-C - O - C kwipolymer.

2.3 Ukuzimisela kweViscosity

Thatha isampuli ye-cannabis stalk cellulose ether isampuli kwaye uyifake kwi-beaker ukuze ulungiselele isisombululo se-2% samanzi, usishukumise ngokucokisekileyo, ulinganise i-viscosity yayo kunye nokuzinza kwe-viscosity kunye ne-viscometer, kwaye ulinganise umyinge we-viscosity ngamaxesha e-3. I-viscosity yesampula ye-cannabis stalk cellulose ether isampuli yayiyi-11. 8 mPa·s.

2.4 Ubungakanani besicelo

2.4.1 Ulungelelwaniso oluludaka

I-slurry ilungiselelwe kwi-1000mL ye-slurry eneqhekeza elikhulu le-3.5%, ixutywe ngokulinganayo kunye nomxube, ize ifakwe kwindawo yokuhlambela amanzi kwaye ishushu kwi-95 ° C ngeyure eli-1. Ngexesha elifanayo, qaphela ukuba isitya sokupheka se-pulp kufuneka sitywinwe kakuhle ukukhusela ukuxinwa kwe-slurry ekunyuseni ngenxa yokunyuka kwamanzi.

2.4.2 Ukwenziwa kwe-slurry pH, ukuxutywa kunye neCOD

Xuba i-hydroxypropyl methyl cellulose kunye nobukhulu obuthile besitatshi ukulungiselela i-slurry (1 # ~ 4 #), kwaye uthelekise kunye ne-PVA formula slurry (0 #) ukuhlalutya i-pH, ukungahambi kakuhle kunye ne-COD. Umsonto odityanisiweyo we-polyester-cotton T/C65/3514.7 we-tex wawulinganiswe kumatshini wesampulu we-ESS1000, kwaye ukusebenza kwawo kwahlalutywa.

Ingabonwa ukuba i-hemp stalk cellulose ether eyenziwe yasekhaya kunye nobungakanani besitatshi obukhethekileyo 3 # zezona zilungelelaniso zobungakanani: 25% hemp stalk cellulose ether, 65% modified starch kunye ne-10% FS-101.

Yonke idatha yokulinganisa ithelekiswa nedatha yobungakanani bePVA yobungakanani, ebonisa ukuba ubungakanani obuxubeneyo behydroxypropyl methylcellulose kunye nesitatshi esithile sinomgangatho olungileyo wokusebenza; i-pH yayo isondele ekungathathi hlangothi; i-hydroxypropyl methylcellulose kunye ne-starch ethile I-COD (17459.2 mg / L) yesitashi esixubileyo esixubileyo sasiphantsi kakhulu kunobukhulu be-PVA (26448.0 mg / L), kunye nokusebenza kokusingqongileyo kwakukuhle.

3. Isiphelo

Eyona nkqubo yokuvelisa i-hemp stalk cellulose ether-hydroxypropyl methylcellulose yokulinganisa imi ngolu hlobo lulandelayo: i-high-pressure yavuselelwa ireactor enesantya sokujikeleza se-240-350 r/min, iqhezu lobunzima be-lye ye-35%, kunye ne-compression ratio. yealkali cellulose 2.4, iqondo lobushushu methylation yi 75 ℃, kwaye iqondo lobushushu hydroxypropylation yi 50 ℃, nganye igcinwe iiyure ezi-2, ulwelo umthamo ratio methyl chloride kunye propylene oxide yi 7:3, vacuum, uxinzelelo reaction yi 2.0 MPa, I-isopropanol yi-diluent.

I-hemp stalk cellulose ether yasetyenziselwa ukubuyisela ubungakanani bePVA yokulinganisa, kwaye umlinganiselo ofanelekileyo wobungakanani wawu: 25% hemp stalk cellulose ether, 65% isitatshi esilungisiweyo kunye ne-10% FS-101. I-pH ye-slurry yi-6.5 kunye ne-COD (17459.2 mg / L) iphantsi kakhulu kune-PVA slurry (26448.0 mg / L), ebonisa ukusebenza kakuhle kokusingqongileyo.

I-hemp stalk cellulose ether yayisetyenziselwa ukulinganisa endaweni yesayizi yePVA ukulinganisa i-polyester-cotton edityanisiweyo yalaphu T/C 65/3514.7tex. Isalathiso sobungakanani siyalingana. I-hemp stalk entsha ye-cellulose ether kunye nesitatshi esilungisiweyo sobukhulu obuxutyiweyo bungathatha indawo yesayizi ye-PVA.


Ixesha lokuposa: Feb-20-2023
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