Lisebelisoa tse tala bakeng sa Cellulose Ether

Ts'ebetso ea tlhahiso ea makhasi a phahameng a viscosity bakeng sa cellulose ether e ile ea ithutoa. Ho ile ha buisanoa ka lintlha tse ka sehloohong tse amang ho pheha le bleaching nakong ea tlhahiso ea li-pulp tse phahameng tsa viscosity. Ho ea ka litlhoko tsa moreki, ka tlhahlobo ea ntlha e le 'ngoe le mokhoa oa tlhahlobo oa orthogonal, o kopantsoeng le bokhoni ba lisebelisoa tsa' nete tsa k'hamphani, litekanyetso tsa ts'ebetso ea tlhahiso ea viscosity e phahameng.k'hothone e hloekisitsoengmakhapetla lisebelisoa tse so ntlafatsoebakeng sa cellulose ether ba ikemiselitse. Ho sebelisa mokhoa ona oa tlhahiso, bosoeu ba li-viscosity tse phahamenghloekisitsoemakhasi a k'hothone a hlahisoang bakeng sa cellulose ether ke≥85%, le viscosity ke≥1800 mL/g.

Mantsoe a bohlokoa: makhasi a phahameng a viscosity bakeng sa cellulose ether; ts'ebetso ea tlhahiso; ho pheha; bleaching

Cellulose ke motsoako oa polymer oa tlhaho o ngata ka ho fetesisa ebile o ka nchafatsoa ka tlhaho. E na le mehloli e mengata e fapaneng, theko e tlaase, le botsoalle ba tikoloho. Letoto la li-derivatives tsa cellulose li ka fumanoa ka ho fetola lik'hemik'hale. Cellulose ether ke motsoako oa polima moo hydrogen e sehlopheng sa hydroxyl se karolong ea glucose ea cellulose e nkeloang sebaka ke sehlopha sa hydrocarbon. Ka mor'a etherification, selulose e qhibiliha ka metsing, e hlapolla tharollo ea alkali le motsoako oa tlhaho, 'me e na le thermoplasticity. China ke mohlahisi e moholo ka ho fetisisa lefatšeng le moreki oa cellulose ether, ka sekhahla sa kholo ea selemo le selemo se fetang 20%. Ho na le mefuta e mengata ea li-cellulose ethers tse nang le ts'ebetso e babatsehang, 'me li sebelisoa haholo kahong, samente, petroleum, lijo, masela, sesepa, pente, meriana, ho etsa pampiri le lisebelisoa tsa elektronike le liindasteri tse ling.

Ka tsoelo-pele e potlakileng ea tšimo ea lihlahisoa tse kang cellulose ether, tlhokahalo ea lihlahisoa tse tala bakeng sa tlhahiso ea eona e ntse e eketseha. Lisebelisoa tse ka sehloohong tsa tlhahiso ea cellulose ether ke makhasi a k'hothone, makhasi a lehong, makhasi a bamboo, joalo-joalo Har'a tsona, k'hothone ke sehlahisoa sa tlhaho se nang le lintho tse ngata ka ho fetisisa tsa cellulose ka tlhaho, 'me naha ea heso ke naha e kholo e hlahisang k'hothone, kahoo makhasi a k'hothone a thepa e tala e loketseng bakeng sa tlhahiso ea cellulose ether. E khethehileng e hlahisoang linaheng tse ling thepa e khethehileng le thekenoloji bakeng sa tlhahiso e khethehileng ea selulose, e amohela mocheso o tlaase-tlase-alkali ho pheha, ho hlahisa theknoloji e tala e tsoelang pele ea bleaching, ho laola ka ho feletseng ts'ebetso ea tlhahiso ea tlhahiso, ho nepahala ho laola ts'ebetso ho fihlile boemong bo tsoetseng pele ba indasteri e tšoanang lapeng le linaheng tse ling. . Ka kopo ea bareki ba hae le linaheng tse ling, k'hamphani e entse liteko tsa lipatlisiso le nts'etsopele holim'a makhasi a k'hothone a phahameng a viscosity bakeng sa cellulose ether, 'me mehlala e amohetsoe hantle ke bareki.

1. Teko

1.1 Lisebelisoa tse tala

Makhasi a phahameng a viscosity bakeng sa cellulose ether e hloka ho fihlela litlhoko tsa bosoeu bo phahameng, viscosity e phahameng le lerole le tlase. Ka lebaka la litšobotsi tse phahameng tsa viscosity k'hothone pulp bakeng sa cellulose ether, pele ho tsohle, ho ile ha etsoa taolo e tiileng mabapi le khetho ea thepa e tala, le lithara tsa k'hothone tse nang le khōlo e phahameng, li-viscosity tse phahameng, ha ho na li-filament tse tharo, le peo e tlaase ea k'hothone. li-hull content li ile tsa khethoa e le lisebelisoa tse tala. Ho ea ka li-linters tse ka holimo tsa k'hothone Ho ea ka litlhoko tsa matšoao a sa tšoaneng, ho ikemiselitse ho sebelisa li-cotton linters Xinjiang e le lisebelisoa tse tala bakeng sa tlhahiso ea makhasi a phahameng a viscosity bakeng sa cellulose ether. Matšoao a boleng ba Xinjiang cashmere ke: viscosity≥2000 mL/g, kholo≥70%, sulfuric acid insolble taba≤6.0%, dikahare tsa molora≤1.7%.

1.2 Lisebelisoa le meriana

Lisebelisoa tsa liteko: PL-100 pitsa ea ho pheha ea motlakase (Chengyang Taisite Experimental Equipment Co., Ltd.), sesebelisoa sa ho hlapa metsi ka mocheso o sa khaotseng (Longkou Electric Furnace Factory), PHSJ 3F precision pH meter (Shanghai Yidian Scientific Instrument Co., Ltd.), Capillary viscometer, WSB～2 limithara tse tšoeu (Jinan Sanquan Zhongshishi

Laboratory Instrument Co., Ltd.).

Lithethefatsi tsa liteko: NaOH, HCl, NaClO, H2O2, NaSiO3.

1.3 Tsela ea ho sebetsa

Lithako tsa k'hothone→ho pheha alkali→ho hlatsoa→ho hulanya→bleaching (ho kenyeletsoa kalafo ea asiti)→ho etsa makhasi→sehlahisoa se felileng→tlhahlobo ea index

1.4 Litaba tsa liteko

Mokhoa oa ho pheha o itšetlehile ka mokhoa oa sebele oa tlhahiso, o sebelisa ho lokisetsa thepa e metsi le mekhoa ea ho pheha ea alkaline. Hloekisa habonolo feela 'me u tlose li-linters tsa k'hothone tse ngata, eketsa li-lye tse baloang ho latela tekanyo ea mokelikeli le palo ea alkali e sebelisitsoeng, kopanya ka ho feletseng lisebelisoa tsa k'hothone le lye, u li kenye ka tanka ea ho pheha,' me u phehe ho ea ka mocheso o fapaneng oa ho pheha le linako tse ling. E phehe. Litholoana ka mor'a ho pheha lia hlatsuoa, li otloa le ho hloekisoa hore li sebelisoe hamorao.

Ts'ebetso ea bleaching: li-parameter tse kang pulp concentration le pH value li khethoa ka kotloloho ho latela bokhoni ba 'nete ba lisebelisoa le mekhoa ea ho soeufala,' me ho buisanoa ka lintlha tse amehang tse kang palo ea bleaching agent ka liteko.

bleaching e arotsoe ka mekhahlelo e meraro: (1) Tloaelehileng pre-chlorination stage bleaching, lokisa pulp concentration ho 3%, eketsa asiti ho laola pH boleng ba makhasi ho 2.2-2.3, eketsa palo e itseng ea sodium hypochlorite ho bleach mocheso oa kamore bakeng sa metsotso e 40. (2) Hydrogen peroxide karolo bleaching, lokisa makhasi a mahloriso ho ba 8%, eketsa sodium hydroxide ho alkalinize slurry, eketsa hydrogen peroxide le ho phetha bleaching ka mocheso o itseng (karolo ea hydrogen peroxide bleaching e eketsa palo e itseng ea stabilizer sodium silicate ). Mocheso o khethehileng oa ho soeufala, tekanyo ea hydrogen peroxide le nako ea ho soeufatsa li ile tsa hlahlojoa ka liteko. (3) Karolo ea kalafo ea asiti: lokisa "pulp concentration" ho 6%, eketsa lithuso tsa ho tlosa acid le tšepe bakeng sa kalafo ea asiti, ts'ebetso ea karolo ena e etsoa ho latela ts'ebetso e tloaelehileng ea k'hamphani e khethehileng ea tlhahiso ea makhasi a k'hothone, mme ts'ebetso e ikhethileng e etsoa. ha ho hlokahale ho tsoela pele ho buisanoa ka liteko.

Nakong ea ts'ebetso ea liteko, mohato o mong le o mong oa ho soeufala o fetola "pulp concentration" le pH, o eketsa karolo e itseng ea "bleaching reagent", o kopanya "pulp" le "bleaching reagent" ka ho lekana ka mokotleng oa polasetiki oa polyethylene, 'me o o beha ka har'a bateng ea metsi e sa feleng bakeng sa mocheso o sa feleng. ho soeufala ka nako e itseng. Ts'ebetso ea ho soeufatsa Ntša seretse se mahareng metsotso e meng le e meng e 10, kopanya le ho se luba ka ho lekana ho netefatsa ho tšoana ha bleaching. Ka mor'a mohato o mong le o mong oa bleaching, e hlatsuoa ka metsi, ebe e tsoela pele ho ea sethaleng se latelang sa bleaching.

1.5 Ho hlahloba le ho lemoha lintho tse senyehileng

GB/T8940.2-2002 le GB/T7974-2002 li ile tsa sebelisoa bakeng sa ho lokisa le ho lekanya bosoeu ba lisampole tsa bosoeu bo hlaka ka ho latellana; GB/T1548-2004 e ne e sebelisetsoa tekanyo ea slurry viscosity.

2. Liphetho le lipuisano

2.1 Tlhahlobo ea sepheo

Ho ea ka litlhoko tsa bareki, matšoao a mantlha a tekheniki a phahameng a viscosity pulp bakeng sa cellulose ether ke: bosoeu.≥85%, viscosity≥1800 mL/g,α- cellulose≥90%, litaba tsa molora≤0.1%, tšepe≤12 mg / kg joalo-joalo Ho ea ka phihlelo ea lilemo tse ngata tsa k'hamphani ho hlahisa makhasi a khethehileng a k'hothone, ka ho laola maemo a loketseng a ho pheha, ho hlatsoa le maemo a phekolo ea asiti nakong ea bleaching,α-cellulose, molora, dikahare tsa tšepe le matšoao a mang, ho bonolo ho finyella litlhoko tsa tlhahiso ea sebele. Ka hona, bosoeu le viscosity li nkoa e le sepheo sa tsoelo-pele ena ea liteko.

2.2 Mokhoa oa ho pheha

Mokhoa oa ho pheha ke ho senya lerako le ka sehloohong la fiber le sodium hydroxide tlas'a mocheso o itseng oa ho pheha le khatello, e le hore litšila tse se nang cellulose tse qhibilihang ke metsi le alkali, mafura le boka ka har'a lithapo tsa k'hothone li qhibilihe. dikahare tsaα- cellulose ea eketseha. . Ka lebaka la ho phunyeha ha liketane tsa cellulose macromolecular nakong ea ho pheha, tekanyo ea polymerization e fokotsehile mme viscosity ea fokotseha. Haeba tekanyo ea ho pheha e le bobebe haholo, makhasi a ke ke a pheha ka ho feletseng, bleaching e latelang e tla fokola, 'me boleng ba sehlahisoa bo tla ba bo sa tsitsang; haeba tekanyo ea ho pheha e le boima haholo, liketane tsa limolek'hule tsa cellulose li tla senya ka matla 'me viscosity e tla ba tlase haholo. Ha ho nahanoa ka botlalo litlhoko tsa bleachability le viscosity index ea slurry, ho ikemiselitsoe hore viscosity ea slurry ka mor'a ho pheha ke.≥1900 mL/g, mme bosweu bo≥55%.

Ho ea ka lintlha tse ka sehloohong tse amang phello ea ho pheha: palo ea alkali e sebelisitsoeng, mocheso oa ho pheha, le nako ea ho tšoara, mokhoa oa tlhahlobo ea orthogonal o sebelisetsoa ho etsa liteko ho khetha maemo a nepahetseng a ho pheha.

Ho latela lintlha tse futsanehileng haholo tsa liphetho tsa tlhahlobo ea orthogonal, tšusumetso ea lintlha tse tharo mabapi le phello ea ho pheha ke e latelang: mocheso oa ho pheha> chelete ea alkali> nako ea ho ts'oara. Mocheso oa ho pheha le bongata ba alkaline li na le tšusumetso e kholo ho viscosity le bosoeu ba makhasi a k'hothone. Ka ho eketseha ha mocheso oa ho pheha le bongata ba alkali, bosoeu bo atisa ho eketseha, empa viscosity e atisa ho fokotseha. Bakeng sa tlhahiso ea makhasi a phahameng a viscosity, maemo a ho pheha a itekanetseng a lokela ho amoheloa ka hohle kamoo ho ka khonehang ha a ntse a netefatsa bosoeu. Ka hona, hammoho le lintlha tsa liteko, mocheso oa ho pheha ke 115°C, 'me palo ea alkali e sebelisitsoeng ke 9%. Phello ea ho tšoara nako har'a lintlha tse tharo e batla e fokola ho feta ea lintlha tse ling tse peli. Kaha ho pheha hona ho nka mokhoa oa ho pheha oa alkali le mocheso o tlase, e le ho eketsa ho tšoana ha ho pheha le ho netefatsa botsitso ba viscosity ea ho pheha, nako ea ho tšoara e khethoa e le metsotso e 70. Ka hona, motsoako oa A2B2C3 o ne o ikemiselitse ho ba mokhoa o molemo ka ho fetisisa oa ho pheha bakeng sa pulp e phahameng ea viscosity. Tlas'a maemo a ts'ebetso ea tlhahiso, bosoeu ba makhasi a ho qetela e ne e le 55.3%, 'me viscosity e ne e le 1945 mL/g.

2.3 Mokhoa oa ho soeufatsa

2.3.1 Ts'ebetso ea pele ho chlorination

Karolong ea pele ho chlorination, palo e nyane haholo ea sodium hypochlorite e eketsoa ho makhasi a k'hothone ho fetolela lignin ka har'a makhasi a k'hothone hore e be lignin ea chlorinated le ho qhibiliha. Ka mor'a hore bleaching boemong ba pele ho chlorination, viscosity ea slurry e tlameha ho laoloa hore e be.≥1850 mL/g, le bosoeu≥63%.

Palo ea sodium hypochlorite ke eona ntho e ka sehloohong e amang phello ea bleaching karolong ena. Bakeng sa ho hlahloba palo e nepahetseng ea chlorine e fumanehang, ho ile ha sebelisoa mokhoa o le mong oa tlhahlobo ea ntlha ho etsa liteko tse 5 tse tšoanang ka nako e le 'ngoe. Ka ho eketsa litekanyo tse fapaneng tsa sodium hypochlorite ho slurry, chlorine e sebetsang ka har'a slurry The chlorine content e ne e le 0.01 g/L, 0.02 g/L, 0.03 g/L, 0.04 g/L, 0.05 g/L ka ho latellana. Ka mor'a bleaching, viscosity le BaiDu.

Ho tloha liphetohong tsa k'hothone pulp whiteness le viscosity ka bongata ba chlorine e fumanehang, ho ka fumanoa hore ka keketseho ea chlorine e fumanehang, bosoeu ba makhasi a k'hothone bo eketseha butle-butle, 'me viscosity e fokotseha butle-butle. Ha palo ea chlorine e fumanehang e le 0.01g/L le 0.02g/L, bosoeu ba makhasi a k'hothone ke≤63%; ha palo ea chlorine e fumanehang e le 0.05g/L, ponahalo ea makhasi a k'hothone ke≤1850mL/g, e sa fihlelle litlhoko tsa pele ho chlorination. Litlhokahalo tsa sekhechana sa taolo ea bleaching. Ha palo ea chlorine e fumanehang e le 0.03g/L le 0.04g/L, matšoao ka mor'a ho soeufala ke viscosity 1885mL/g, bosoeu 63.5% le viscosity 1854mL/g, bosoeu 64.8%. Lenane la litekanyetso li lumellana le litlhoko tsa matšoao a ho laola bleaching karolong ea pele ho chlorination, kahoo ho lekoa pele hore tekanyo e teng ea chlorine karolong ena ke 0.03-0.04g/L.

2.3.2 Patlisiso ea mokhoa oa ho soeufatsa sethaleng sa hydrogen peroxide

Ho soeufala ha hydrogen peroxide ke mohato oa bohlokoa ka ho fetisisa oa ho soeufatsa ts'ebetsong ho ntlafatsa bosoeu. Kamora mohato ona, ho etsoa mohato oa kalafo ea asiti ho phethela ts'ebetso ea bleaching. Sekhahla sa kalafo ea asiti hammoho le sethala se latelang sa ho etsa pampiri le ho theha ha se na phello ho viscosity ea makhasi, 'me se ka eketsa bosoeu ka bonyane 2%. Ka hona, ho ea ka litlhoko tsa index ea taolo ea makhasi a ho qetela a viscosity, litlhoko tsa taolo ea index ea sethala sa hydrogen peroxide bleaching li ikemiselitse ho ba viscosity.≥1800 mL/g le bosoeu≥83%.

Mabaka a ka sehloohong a amang ho soeufala ha hydrogen peroxide ke bongata ba hydrogen peroxide, mocheso o soeufatsang le nako ea ho soeufala. E le ho finyella litlhoko tsa bosoeu le viscosity ea pulp e phahameng ea viscous, lintlha tse tharo tse amang phello ea bleaching li ile tsa hlahlojoa ka mokhoa oa tlhahlobo ea orthogonal ho fumana mekhoa e nepahetseng ea hydrogen peroxide bleaching process parameters.

Ka boitsebiso bo feteletseng ba phapang ea tlhahlobo ea orthogonal, ho fumanoa hore tšusumetso ea lintlha tse tharo ka phello ea bleaching ke: mocheso oa bleaching> tekanyo ea hydrogen peroxide> nako ea bleaching. Thempereichara ea bleaching le bongata ba hydrogen peroxide ke lintlha tse ka sehloohong tse amang phello ea bleaching. Ka keketseho ea butle-butle ea lintlha tsa lintlha tse peli tsa mocheso oa bleaching le palo ea hydrogen peroxide, bosoeu ba makhasi a k'hothone bo eketseha butle-butle, 'me viscosity e fokotseha butle-butle. Ha ho nahanoa ka litšenyehelo tsa tlhahiso, bokhoni ba lisebelisoa le boleng ba sehlahisoa ka botlalo, mocheso oa bleaching oa hydrogen peroxide o ikemiselitse ho ba 80.°C, 'me tekanyo ea hydrogen peroxide ke 5%. Ka nako e ts'oanang, ho ea ka liphello tsa liteko, nako ea bleaching ea hydrogen peroxide ha e na tšusumetso e fokolang ho phello ea bleaching, 'me nako e le' ngoe ea bleaching ea hydrogen peroxide e khethoa e le metsotso e 80.

Ho ea ka mokhoa o khethiloeng oa hydrogen peroxide sethaleng, laboratori e entse liteko tse ngata tsa ho netefatsa, 'me liphetho tsa liteko li bontša hore litekanyetso tsa liteko li ka finyella litlhoko tse behiloeng.

3. Qetello

Ho ea ka litlhoko tsa moreki, ka tlhahlobo ea ntlha e le 'ngoe le tlhahlobo ea orthogonal, e kopantsoe le bokhoni ba thepa ea sebele ea k'hamphani le litšenyehelo tsa tlhahiso, mekhoa ea tlhahiso ea lihlahisoa tse phahameng tsa viscosity pulp bakeng sa cellulose ether li khethoa ka tsela e latelang: (1) Ts'ebetso ea ho pheha: sebelisa 9 % ea alkali, pheha Mocheso oa mocheso ke 115°C, 'me nako ea ho ts'oara ke metsotso e 70. (2) Ts'ebetso ea bleaching: karolong ea pele ho chlorination, tekanyo ea chlorine e fumanehang bakeng sa bleaching ke 0.03-0.04 g/L; karolong ea hydrogen peroxide, mocheso oa bleaching ke 80°C, tekanyo ea hydrogen peroxide ke 5%, 'me nako ea bleaching ke metsotso e 80; Karolo ea kalafo ea acid, ho latela ts'ebetso e tloaelehileng ea k'hamphani.

Phahameng viscosity pulp bakeng sacellulose etherke makhasi a khethehileng a k'hothone a nang le ts'ebeliso e pharaletseng le boleng bo phahameng bo ekelitsoeng. Motheong oa liteko tse ngata, k'hamphani e ikemetse e ntlafalitse ts'ebetso ea tlhahiso ea li-high-viscosity pulp bakeng sa cellulose ether. Hajoale, makhasi a phahameng a viscosity bakeng sa cellulose ether e se e le e 'ngoe ea mefuta e ka sehloohong ea tlhahiso ea k'hamphani ea Kima Chemical,' me boleng ba sehlahisoa bo lemohuoe le ho rorisoa ke bareki lapeng le kantle ho naha.