Raw zvinhu zveCellulose Ether

Nzira yekugadzira ye high viscosity pulp ye cellulose ether yakadzidzwa. Zvinhu zvikuru zvinokanganisa kubika uye bleaching mukuita kwepamusoro-viscosity pulp production zvakakurukurwa. Zvinoenderana nezvinodiwa nemutengi, kuburikidza ne single factor bvunzo uye orthogonal bvunzo nzira, yakasanganiswa nekambani chaiyo michina kugona, iyo yekugadzira maitiro paramita yeakakwira viscosity.cotton yakanatswapulp raw materialye cellulose ether vakatsunga. Kushandisa iyi nzira yekugadzira, kuchena kwepamusoro-viscosityrefineddonje pulp inogadzirwa ye cellulose ether ndiyo≥85%, uye viscosity iri≥1800 mL/g.

Mazwi akakosha: high viscosity pulp ye cellulose ether; kugadzirwa; kubika; bleaching

Cellulose ndiyo yakanyanya kuwanda uye inogona kudzokororwa yemasikirwo epolymer musanganiswa mune zvakasikwa. Iine huwandu hwakawanda hwezvinyorwa, mutengo wakaderera, uye ushamwari hwezvakatipoteredza. Mutsara we cellulose derivatives inogona kuwanikwa kuburikidza nekemikari shanduko. Cellulose ether inhengo yepolymer umo haidrojeni muboka rehydroxyl pane cellulose glucose unit inotsiviwa neboka rehydrocarbon. Mushure me etherification, cellulose inonyungudika mumvura, dilute alkali solution uye organic solvent, uye ine thermoplasticity. China ndiyo inogadzira pasi rose uye mutengi we cellulose ether, ine avhareji yekukura kwegore inopfuura 20%. Kune marudzi akawanda e-cellulose ethers ane mashandiro akanaka, uye anoshandiswa zvakanyanya mukuvaka, simende, peturu, chikafu, machira, detergent, pendi, mushonga, kugadzira mapepa uye zvinhu zvemagetsi uye mamwe maindasitiri.

Nekukurumidza kusimudzira kwemunda wezvinobvamo senge cellulose ether, kudiwa kwezvinhu zvakabikwa zvekugadzirwa kwayo kuri kuwedzerawo. Izvo zvakakosha zvekugadzirwa kwe cellulose ether ndeye donje pulp, matanda ehuni, bamboo pulp, etc. Pakati pazvo, donje ndiro chigadzirwa chepanyama chine chepamusoro-soro che cellulose muzvisikwa, uye nyika yangu inyika yakakura inogadzira donje, saka donje pulp chinhu chakanakira kugadzirwa kwe cellulose ether. Yakasarudzika yakaunzwa yekune dzimwe nyika yakakosha midziyo uye tekinoroji yekugadzira cellulose yakakosha, inotora yakaderera-tembiricha yakaderera-alkali yekubika, girinhi inoenderera mberi bleaching tekinoroji yekugadzira, zvizere otomatiki kudzora kwekugadzira maitiro, maitiro ekudzora kurongeka kwasvika padanho repamusoro reiyo indasitiri imwe chete kumba nekune dzimwe nyika. . Pakukumbira kwevatengi kumba nekune dzimwe nyika, kambani yakaita tsvakiridzo uye budiriro yekuedza pane yakakwirira-viscosity donje pulp ye cellulose ether, uye masampula akagamuchirwa zvakanaka nevatengi.

1. Kuedza

1.1 Raw zvinhu

High viscosity pulp ye cellulose ether inoda kusangana nezvinodiwa zvekuchena kwepamusoro, viscosity yakakwirira uye yakaderera huruva. Tichifunga nezvehunhu hwepamusoro-viscosity donje pulp ye cellulose ether, kutanga kune zvese, kutonga kwakasimba kwakaitwa pakusarudzwa kwezvinhu zvakasvibirira, uye machira ekotoni ane kukura kwakanyanya, high viscosity, isina matatu-filament, uye yakaderera mbeu yekotoni. Hull content yakasarudzwa seyakagadzirwa. Maererano nepamusoro pekotoni linters Maererano nezvinodiwa zvezviratidzo zvakasiyana-siyana, zvakatsunga kushandisa machira ekotoni muXinjiang sechinhu chakasvibiswa chekugadzirwa kwepamusoro-viscosity pulp ye cellulose ether. Zviratidzo zvemhando ye Xinjiang cashmere ndezvi: viscosity≥2000 mL/g, kukura≥70%, sulfuric acid isinganyunguriki chinhu≤6.0%, madota≤1.7%.

1.2 Zviridzwa nemishonga

Midziyo yekuyedza: PL-100 poto yemagetsi yekubikira (Chengyang Taisite Experimental Equipment Co., Ltd.), chiridzwa chisingaperi tembiricha yemvura yekugezera (Longkou Electric Furnace Factory), PHSJ 3F chaiyo pH mita (Shanghai Yidian Scientific Instrument Co., Ltd.), Capillary viscometer, WSB～2 chena mita (Jinan Sanquan Zhongshishi

Laboratory Instrument Co., Ltd.).

Mishonga yekuedza: NaOH, HCl, NaClO, H2O2, NaSiO3.

1.3 Maitiro ekugadzirisa

Makotoni linters→alkali kubika→washing→pulping→bleaching (kusanganisira kurapwa kweasidhi)→kugadzira pulp→chigadzirwa chapera→index test

1.4 Yezvinyorwa zvekuyedza

Nzira yekubika inobva pane chaiyo yekugadzira maitiro, uchishandisa mvura yekugadzirira zvinhu uye nzira dzekubika alkaline. Ingochenesa uye bvisa quantitative donje linters, wedzera iyo yakaverengerwa lye maererano nehuwandu hwemvura uye huwandu hwealkali inoshandiswa, nyatso sanganisa marata edonje nelye, zviise mutangi yekubikira, uye bika zvinoenderana nekupisa kwekubika kwakasiyana uye nguva dzekubata. Zvibike. Iyo pulp mushure mekubika inoshambidzwa, inorohwa uye yakasvibiswa kuti ishandiswe gare gare.

Bleaching process: maparamendi akadai se pulp concentration uye pH kukosha anosarudzwa zvakananga zvichienderana nekwaniso chaiyo yemidziyo uye bleaching routines, uye maparamendi akakodzera akadai sehuwandu hwe bleaching agent inokurukurwa kuburikidza nekuyedza.

Bleaching inopatsanurwa kuita zvinhanho zvitatu: (1) Conventional pre-chlorination stage bleaching, gadzirisa kunyura kwe pulp kusvika pa 3%, wedzera asidhi kudzora pH ye pulp kusvika pa 2.2-2.3, wedzera imwe sodium hypochlorite kuti bleach at kamuri tembiricha kwemaminitsi makumi mana. (2) Hydrogen peroxide chikamu bleaching, gadzirisa pulp concentration kuti ive 8%, wedzera sodium hydroxide kune alkalinize slurry, wedzera hydrogen peroxide uye kuita bleaching pane imwe tembiricha (iyo hydrogen peroxide bleaching chikamu chinowedzera imwe huwandu hwe stabilizer sodium silicate). Iyo chaiyo tembiricha ye bleaching, hydrogen peroxide dosi uye bleaching nguva yakaongororwa kuburikidza nekuyedza. (3) Acid kurapwa chikamu: gadzirisa iyo pulp concentration kusvika 6%, wedzera asidhi uye simbi ion kubvisa aids yeasidi kurapwa, maitiro echikamu ichi anoitwa zvinoenderana neyakajairwa yekambani yakakosha kugadzirwa kwekotoni pulp process, uye maitiro chaiwo anoita. hazvidi kuti zviwedzere kukurukurwa.

Munguva yekuedza, imwe neimwe nhanho yekutsvaira inogadzirisa kusungirirwa kwe pulp uye pH, inowedzera imwe chikamu che bleaching reagent, inosanganisa pulp uye reagent ye bleaching zvakaenzana mubhegi repolyethylene rakavharwa bhegi, uye inoiisa mune inogara tembiricha yekugezera yemvura yekudziya nguva dzose. bleaching kwenguva yakatarwa. Maitiro ekuita bleaching Bvisa slurry yepakati maminetsi ega ega, sanganisa uye woikanya zvakaenzanirana kuti uve nechokwadi chekufanana kwekuchena. Mushure mechikamu chimwe nechimwe chekutsvaira, inoshambidzwa nemvura, uye inopfuurira kune imwe nhanho yekutsvaira.

1.5 Slurry kuongorora uye kuona

GB/T8940.2-2002 uye GB/T7974-2002 zvakashandiswa kugadzirira uye kuchena kuyerwa kwemasamples e slurry whiteness zvichiteerana; GB/T1548-2004 yakashandiswa slurry viscosity kuyerwa.

2. Migumisiro uye nhaurirano

2.1 Chinangwa chekuongorora

Zvinoenderana nezvinodiwa nevatengi, iyo huru tekinoroji zviratidzo zveyakakwira viscosity pulp ye cellulose ether ndeiyi: kuchena.≥85%, viscosity≥1800 mL/g,α- cellulose≥90%, madota≤0.1%, iron≤12 mg / kg etc. Maererano nekambani yemakore akawanda echiitiko mukugadzirwa kwekotoni pulp yakakosha, nekudzora mamiriro akakodzera ekubikira, kugeza uye kurapa kweasidhi mukugadzirisa bleaching,α-cellulose, madota, iron content uye zvimwe zviratidzo, zviri nyore kuzadzisa zvinodiwa mukugadzirwa chaiko. Naizvozvo, kuchena uye viscosity zvinotorwa sechinangwa chekusimudzira uku.

2.2 Kubika maitiro

Nzira yekubika ndeyekuparadza madziro ekutanga e fiber ine sodium hydroxide pasi peimwe tembiricha yekubikira uye kudzvanywa, kuitira kuti mvura-inonyungudika uye alkali-inonyungudika isiri-cellulose tsvina, mafuta uye wakisi mumachira edonje zvinonyungudika, uye iyo inonyungudika. content ofα- cellulose inowedzera. . Nekuda kwekutsemuka kwe cellulose macromolecular cheni panguva yekubika, dhigirii repolymerization rakaderedzwa uye viscosity inoderedzwa. Kana dhigirii yekubika yakanyanyisa, pulp haigoni kubikwa zvakakwana, bleaching inotevera ichava yakashata, uye unhu hwechigadzirwa huchave husina kugadzikana; kana dhigirii yekubika yakanyanyisa kurema, iyo cellulose molecular cheni ichabvisa nechisimba uye viscosity ichave yakaderera. Kunyatsofunga nezve bleachability uye viscosity index zvinodiwa zve slurry, zvinotemerwa kuti viscosity ye slurry mushure mekubika ndeye.≥1900 mL/g, uye kuchena ndiko≥55%.

Zvinoenderana nezvikonzero zvikuru zvinokanganisa maitiro ekubika: huwandu hwealkali hunoshandiswa, tembiricha yekubikira, uye nguva yekubata, iyo orthogonal bvunzo nzira inoshandiswa kuita zviedzo kusarudza yakakodzera nzira yekubika.

Zvinoenderana neakanyanya kuderera data reiyo orthogonal bvunzo mhinduro, pesvedzero yezvinhu zvitatu pakubika maitiro ndeaya: kupisa tembiricha> alkali huwandu> kubata nguva. Kupisa kwekubika uye huwandu hwealkali hune simba guru pane viscosity uye kuchena kwekotoni pulp. Nekuwedzera kwekupisa kwekubika uye kuwanda kwealkali, kuchena kunowedzera kuwedzera, asi viscosity inowanzoderera. Nekugadzirwa kwe-high-viscosity pulp, mamiriro ekubikira ane mwero anofanirwa kugamuchirwa zvakanyanya sezvinobvira uchive nechokwadi chekuchena. Naizvozvo, mukubatana nedata rekuyedza, tembiricha yekubika ndeye 115°C, uye huwandu hwealkali hunoshandiswa i9%. Mhedzisiro yekubata nguva pakati pezvinhu zvitatu ishoma pane iyo yezvimwe zvinhu zviviri. Sezvo kubika uku kunotora nzira yakaderera-alkali uye yakadzika-kupisa yekubika, kuitira kuti kuwedzere kufanana kwekubika uye kuve nechokwadi chekugadzikana kwekubika viscosity, nguva yekubata inosarudzwa semaminitsi makumi manomwe. Naizvozvo, musanganiswa weA2B2C3 wakatemerwa kuve wakanakisa kubika maitiro epamusoro-viscosity pulp. Pasi pemamiriro ekugadzirwa kwemaitiro, kuchena kwepepuru yekupedzisira yaive 55.3%, uye viscosity yaive 1945 mL/g.

2.3 Kuchenesa

2.3.1 Pre-chlorination process

Muchikamu che-pre-chlorination, shoma shoma ye sodium hypochlorite inowedzerwa kune donje pulp kushandura lignin mumucheka wekotoni mu chlorinated lignin uye inonyungudutswa. Mushure mekuchenesa mu pre-chlorination stage, viscosity ye slurry inofanira kudzorwa kuti ive.≥1850 mL/g, uye kuchena≥63%.

Huwandu hwe sodium hypochlorite ndicho chinhu chikuru chinokanganisa bleaching effect muchikamu chino. Kuti uongorore huwandu hwakakodzera hweklorini iripo, nzira imwechete yekuyedza yakashandiswa kuita 5 parallel kuyedza panguva imwe chete. Nokuwedzera zvakasiyana-siyana zve sodium hypochlorite mu slurry, iyo chlorine inoshanda mu slurry The chlorine content yaiva 0.01 g/L, 0.02 g/L, 0.03 g/L, 0.04 g/L, 0.05 g/L zvakateerana. Mushure mekuchenesa, iyo viscosity uye BaiDu.

Kubva pakushandurwa kwekotoni pulp whiteness uye viscosity nehuwandu hweklorini inowanikwa, inogona kuwanikwa kuti nekuwedzera kweklorini inowanikwa, kuchena kwekotoni pulp kunowedzera zvishoma nezvishoma, uye viscosity inoderera zvishoma nezvishoma. Kana huwandu hwechlorine iripo iri 0.01g/L uye 0.02g/L, kuchena kwedonje pulp ndiko.≤63%; kana huwandu hweklorini huripo huri 0.05g/L, viscosity yedonje pulp≤1850mL/g, iyo isingazadzise pre-chlorination zvinodiwa. Segment bleaching control indicator zvinodiwa. Kana huwandu hweklorini huripo huri 0.03g/L uye 0.04g/L, zviratidzo mushure mekubvongodzwa zvinosanganisira viscosity 1885mL/g, kuchena 63.5% uye viscosity 1854mL/g, kuchena 64.8%. Kuwanda kwedosi kunoenderana nezvinodiwa zvezviratidzi zvekudzora kuchena muchikamu chepre-chlorination, saka zvinogara zvichitariswa kuti chlorine inowanikwa muchikamu chino i0.03-0.04g/L.

2.3.2 Hydrogen peroxide stage bleaching process research

Hydrogen peroxide bleaching ndiyo inonyanya kukosha bleaching nhanho mukuita bleaching kuvandudza kuchena. Mushure meichi nhanho, nhanho yekurapwa kweasidhi inoitwa kuti ipedze kuita bleaching. Iyo asidi yekurapa nhanho pamwe neinozotevera yekugadzira mapepa uye kuumba nhanho haina mhedzisiro pane viscosity yepulp, uye inogona kuwedzera kuchena neinosvika 2%. Naizvozvo, zvinoenderana nezvinodiwa zvekudzora index zveyekupedzisira high-viscosity pulp, iyo index control inodiwa yeiyo hydrogen peroxide bleaching nhanho inotemerwa kuve viscosity.≥1800 mL/g uye kuchena≥83%.

Zvinhu zvikuru zvinokanganisa hydrogen peroxide bleaching huwandu hwehydrogen peroxide, tembiricha yekuchena, uye nguva yekuchena. Kuti uwane kuchena uye viscosity zvinodiwa zveyakakwirira viscous pulp, zvinhu zvitatu zvinokanganisa bleaching mhedzisiro zvakaongororwa ne orthogonal test method kuona yakakodzera hydrogen peroxide bleaching process parameters.

Kuburikidza nemusiyano wakanyanya data weiyo orthogonal bvunzo, zvinoonekwa kuti pesvedzero yezvinhu zvitatu pane bleaching mhedzisiro ndeye: bleaching tembiricha> hydrogen peroxide dosage> bleaching nguva. Kupisa kwe bleaching uye huwandu hwehydrogen peroxide ndizvo zvinhu zvikuru zvinokanganisa bleaching effect. Nekuwedzera zvishoma nezvishoma kwe data yezvinhu zviviri zvekushisa kwe bleaching uye huwandu hwehydrogen peroxide, kuchena kwekotoni pulp kunowedzera zvishoma nezvishoma, uye viscosity inoderera zvishoma nezvishoma. Tichifunga nezve mutengo wekugadzira, huwandu hwemidziyo uye mhando yechigadzirwa zvakazara, tembiricha yekupisa yehydrogen peroxide inotarwa kuve 80.°C, uye hydrogen peroxide dosage i5%. Panguva imwecheteyo, maererano nemigumisiro yekuedza, nguva ye bleaching yehydrogen peroxide ine simba shoma pane bleaching effect, uye imwe-stage bleaching time yehydrogen peroxide inosarudzwa semaminitsi makumi masere.

Zvinoenderana neyakasarudzwa hydrogen peroxide nhanho yekubvongodza maitiro, marabhoritari yakaita nhamba huru yekudzokororwa yekuongorora kuyedza, uye mhedzisiro yekuyedza inoratidza kuti kuyedza paramita inogona kuzadzisa zvakatarwa zvinotarisirwa.

3. Mhedziso

Zvinoenderana nezvinodiwa nemutengi, kuburikidza ne single factor bvunzo uye orthogonal bvunzo, yakasanganiswa neiyo chaiyo yekambani kugona kwemidziyo uye mutengo wekugadzira, magadzirirwo emhando yepamusoro-viscosity pulp ye cellulose ether anotemerwa sezvinotevera: (1) Kubika maitiro: shandisa 9 % yealkali, kubika Tembiricha i115°C, uye nguva yekubata imaminitsi makumi manomwe. (2) Bleaching process: muchikamu chepre-chlorination, muyero weklorini inowanikwa ye bleaching ndeye 0.03-0.04 g/L; muchikamu chehydrogen peroxide, tembiricha yebleaching i80°C, muyero wehydrogen peroxide i5%, uye nguva yekubvisa maminetsi makumi masere; Acid kurapwa chikamu, maererano nekambani yakajairika maitiro.

High viscosity pulp nokudacellulose etherndeye yakakosha donje pulp ine yakafara application uye yakakwirira yakawedzera kukosha. Pachikonzero chenhamba yakawanda yekuedza, kambani yakazvimiririra yakagadzira nzira yekugadzira ye-high-viscosity pulp ye cellulose ether. Parizvino, high-viscosity pulp ye cellulose ether yave imwe yemhando huru yekugadzira yeKima Chemical, uye mhando yechigadzirwa yave ichizivikanwa pamwe nekurumbidzwa nevatengi kumba nekune dzimwe nyika.