Raw khoom rau Cellulose Ether

Kev tsim cov txheej txheem ntawm siab viscosity pulp rau cellulose ether tau kawm. Cov ntsiab lus tseem ceeb cuam tshuam rau kev ua noj thiab tshuaj dawb hauv cov txheej txheem ntawm high-viscosity pulp ntau lawm tau tham txog. Raws li cov neeg siv khoom xav tau, dhau los ntawm ib qho kev xeem thiab kev xeem orthogonal, ua ke nrog lub tuam txhab cov cuab yeej muaj peev xwm, cov txheej txheem ntau lawm tsis muaj viscosity siab.refined paj rwbpulp raw khoomrau cellulose ether raug txiav txim. Siv cov txheej txheem no ntau lawm, lub whiteness ntawm high-viscosityua kom zoopaj rwb pulp tsim rau cellulose ether yog≥85%, thiab viscosity yog≥1800 mL/g.

Cov lus tseem ceeb: siab viscosity pulp rau cellulose ether; txheej txheem ntau lawm; ua noj; tshuaj dawb

Cellulose yog qhov ntau tshaj thiab rov ua dua tshiab ntawm cov khoom siv polymer hauv qhov xwm txheej. Nws muaj ntau qhov chaw, tus nqi qis, thiab ib puag ncig tus phooj ywg. Ib series ntawm cellulose derivatives tuaj yeem tau los ntawm kev hloov kho tshuaj. Cellulose ether yog ib qho polymer compound uas hydrogen nyob rau hauv pawg hydroxyl ntawm cellulose qabzib chav tsev yog hloov los ntawm ib pawg hydrocarbon. Tom qab etherification, cellulose yog soluble hauv dej, dilute alkali tov thiab organic hnyav, thiab muaj thermoplasticity. Tuam Tshoj yog lub ntiaj teb cov neeg tsim khoom loj tshaj plaws thiab cov neeg siv khoom ntawm cellulose ether, nrog qhov nruab nrab txhua xyoo kev loj hlob ntawm ntau tshaj 20%. Muaj ntau hom cellulose ethers nrog kev ua tau zoo, thiab lawv tau siv dav hauv kev tsim kho, cement, roj av, khoom noj khoom haus, textile, detergent, xim, tshuaj, papermaking thiab electronics thiab lwm yam lag luam.

Nrog rau txoj kev loj hlob sai ntawm kev lag luam ntawm derivatives xws li cellulose ether, qhov kev thov rau cov khoom siv raw rau nws cov khoom tseem nce ntxiv. Cov ntaub ntawv tseem ceeb rau kev tsim cov cellulose ether yog paj rwb pulp, ntoo pulp, xyoob pulp, thiab lwm yam. Ntawm lawv, paj rwb yog cov khoom ntuj tsim nrog cov ntsiab lus cellulose siab tshaj plaws nyob rau hauv qhov xwm txheej, thiab kuv lub teb chaws yog cov paj rwb loj hauv lub teb chaws, yog li paj rwb pulp yog ib qho khoom siv zoo tagnrho rau kev tsim cov cellulose ether. Tshwj xeeb tshaj yog qhia txawv teb chaws cov cuab yeej tshwj xeeb thiab thev naus laus zis rau kev tsim cov cellulose tshwj xeeb, txais yuav qhov kub thiab txias qis-alkali ua noj, ntsuab nruam bleaching ntau lawm technology, tag nrho tsis siv neeg tswj cov txheej txheem ntau lawm, cov txheej txheem tswj qhov tseeb tau mus txog qib siab ntawm tib txoj kev lag luam hauv tsev thiab txawv teb chaws. . Raws li kev thov ntawm cov neeg siv khoom hauv tsev thiab txawv teb chaws, lub tuam txhab tau ua cov kev tshawb fawb thiab kev txhim kho kev sim ntawm high-viscosity paj rwb pulp rau cellulose ether, thiab cov qauv tau txais txiaj ntsig zoo los ntawm cov neeg siv khoom.

1. Kev sim

1.1 Cov khoom siv raw

High viscosity pulp rau cellulose ether yuav tsum tau ua kom tau raws li qhov yuav tsum tau ntawm siab whiteness, siab viscosity thiab tsis muaj plua plav. Nyob rau hauv kev saib ntawm cov yam ntxwv ntawm high-viscosity paj rwb pulp rau cellulose ether, ua ntej ntawm tag nrho cov, nruj tswj tau ua nyob rau hauv lub xaiv ntawm raw cov ntaub ntawv, thiab paj rwb linters nrog siab loj hlob, siab viscosity, tsis muaj peb-filament, thiab cov paj rwb tsis muaj noob. cov ntsiab lus hull tau raug xaiv ua raw khoom. Raws li cov paj rwb linters saum toj no Raws li qhov yuav tsum tau muaj ntawm ntau yam ntsuas, nws tau txiav txim siab siv paj rwb linters hauv Xinjiang ua cov khoom siv raw rau kev tsim cov viscosity siab rau cellulose ether. Qhov ntsuas zoo ntawm Xinjiang cashmere yog: viscosity≥2000 mL / g, kev loj hlob≥70%, sulfuric acid insoluble teeb meem≤6.0%, cov ntsiab lus tshauv≤1.7%.

1.2 Cov cuab yeej thiab tshuaj

Cov khoom siv sim: PL-100 hluav taws xob ua noj lauj kaub (Chengyang Taisite Experimental Equipment Co., Ltd.), ntsuas qhov kub thiab txias dej da dej (Longkou Hluav Taws Xob Hluav Taws Xob Hoobkas), PHSJ 3F precision pH meter (Shanghai Yidian Scientific Instrument Co., Ltd.), Capillary viscometer, NWS～2 whiteness meter (Jinan Sanquan Zhongshishi

Laboratory Instrument Co., Ltd.).

Kev sim tshuaj: NaOH, HCl, NaClO, H2O2, NaSiO3.

1.3 Txheej txheem txoj kev

Paj rwb linters→alkali ua noj→ntxuav→pulping→bleaching (nrog rau kev kho cov kua qaub)→ua pulp→cov khoom tiav→kev ntsuas ntsuas

1.4 Cov ntsiab lus sim

Cov txheej txheem ua noj yog ua raws li cov txheej txheem tsim khoom tiag tiag, siv cov khoom siv ntub dej thiab alkaline ua noj. Tsuas yog ntxuav thiab tshem tawm ntau cov paj rwb linters, ntxiv cov lye xam raws li cov kua piv thiab tus nqi ntawm alkali siv, tag nrho cov paj rwb linters thiab lye, muab tso rau hauv lub tank ua noj, thiab ua noj raws li qhov sib txawv ua noj kub thiab tuav lub sij hawm. Ua noj. Lub pulp tom qab ua noj yog ntxuav, ntaus thiab bleached rau tom qab siv.

Cov txheej txheem bleaching: tsis xws li cov ntaub so ntswg concentration thiab pH tus nqi raug xaiv ncaj qha raws li lub peev xwm ntawm cov cuab yeej thiab cov txheej txheem bleaching, thiab cov tsis muaj feem cuam tshuam xws li tus nqi ntawm cov tshuaj bleaching yog tham los ntawm kev sim.

Cov tshuaj ntxuav tes tau muab faib ua peb theem: (1) Cov txheej txheem ua ntej chlorination theem bleaching, kho cov ntaub so ntswg mus rau 3%, ntxiv cov kua qaub los tswj pH tus nqi ntawm cov ntaub so ntswg mus rau 2.2-2.3, ntxiv ib qho nyiaj ntawm sodium hypochlorite rau bleach ntawm chav sov rau 40 feeb. (2) Hydrogen peroxide seem bleaching, kho cov ntaub so ntswg kom siab li 8%, ntxiv sodium hydroxide rau alkalinize slurry, ntxiv hydrogen peroxide thiab nqa tawm bleaching ntawm qhov kub thiab txias (lub hydrogen peroxide bleaching seem ntxiv ib qho nyiaj stabilizer sodium silicate ). Qhov tshwj xeeb bleaching kub, hydrogen peroxide ntau npaum li cas thiab lub sij hawm bleaching tau tshawb los ntawm kev sim. (3) Kev kho cov kua qaub: kho cov tawv nqaij mus rau 6%, ntxiv cov kua qaub thiab cov hlau ion tshem tawm cov kua qaub, cov txheej txheem ntawm ntu no yog ua raws li lub tuam txhab cov txheej txheem tshwj xeeb paj rwb pulp tsim, thiab cov txheej txheem tshwj xeeb. tsis tas yuav muaj kev sib tham ntxiv.

Thaum lub sij hawm txoj kev sim, txhua theem ntawm cov tshuaj dawb hloov kho cov pulp concentration thiab pH, ntxiv ib feem ntawm bleaching reagent, sib tov lub pulp thiab bleaching reagent tusyees nyob rau hauv ib tug polyethylene yas kaw lub hnab, thiab muab tso rau hauv ib tug tas mus li dej kub da dej rau qhov kub thiab txias. bleaching rau lub sijhawm teev tseg. Cov txheej txheem bleaching Tshem tawm qhov nruab nrab slurry txhua 10 feeb, sib tov thiab knead nws tusyees kom ntseeg tau tias cov uniformity ntawm bleaching. Tom qab txhua theem ntawm bleaching, nws yog ntxuav nrog dej, thiab ces mus rau theem tom ntej ntawm bleaching.

1.5 Slurry tsom xam thiab nrhiav kom pom

GB / T8940.2-2002 thiab GB / T7974-2002 tau siv rau kev npaj thiab kev ntsuas dawb ntawm slurry whiteness kuaj raws li; GB / T1548-2004 tau siv rau kev ntsuas slurry viscosity.

2. Cov txiaj ntsig thiab kev sib tham

2.1 Lub hom phiaj tsom xam

Raws li cov kev xav tau ntawm cov neeg siv khoom, cov kev qhia tseem ceeb ntawm siab viscosity pulp rau cellulose ether yog: whiteness≥85%, viscosity≥1800 mL/g,α- cellulose≥90%, cov ntsiab lus tshauv≤0.1%, yog '≤12 mg / kg thiab lwm yam raws li lub tuam txhab muaj ntau xyoo ntawm kev paub nyob rau hauv zus tau tej cov paj rwb pulp tshwj xeeb, los ntawm kev tswj qhov tsim nyog ua noj ua haus tej yam kev mob, ntxuav thiab acid kho tej yam kev mob nyob rau hauv lub bleaching txheej txheem,α-cellulose, tshauv, hlau cov ntsiab lus thiab lwm yam ntsuas, nws yog ib qho yooj yim kom tau raws li qhov yuav tsum tau nyob rau hauv tiag tiag ntau lawm. Yog li ntawd, qhov whiteness thiab viscosity raug coj los ua qhov tseem ceeb ntawm qhov kev sim no.

2.2 Kev ua noj ua haus

Cov txheej txheem ua noj yog txhawm rau rhuav tshem cov phab ntsa ntawm cov fiber ntau nrog sodium hydroxide nyob rau hauv ib qho kev ua noj kub thiab siab, kom cov dej-soluble thiab alkali-soluble non-cellulose impurities, rog thiab siv quav ciab hauv cov paj rwb linters yog yaj, thiab cov ntsiab lus ntawmα- cellulose yog nce. . Vim lub cleavage ntawm cellulose macromolecular chains thaum lub sij hawm ua noj ua haus, lub degree ntawm polymerization yog txo thiab viscosity yog txo. Yog hais tias lub degree ntawm kev ua noj yog lub teeb heev, lub pulp yuav tsis siav kom huv si, tom qab bleaching yuav tsis zoo, thiab cov khoom zoo yuav tsis ruaj khov; Yog hais tias qhov degree ntawm kev ua noj hnyav dhau lawm, cov cellulose molecular chains yuav depolymerize hnyav thiab viscosity yuav tsawg dhau. Ua ntej txiav txim siab txog cov tshuaj bleachability thiab viscosity index ntawm cov slurry, nws tau txiav txim siab tias cov viscosity ntawm slurry tom qab ua noj.≥1900 mL / g, thiab whiteness yog≥55%.

Raws li cov ntsiab lus tseem ceeb uas cuam tshuam rau kev ua noj ua haus: tus nqi ntawm alkali siv, qhov kub thiab txias, thiab lub sijhawm tuav, txoj kev ntsuas orthogonal yog siv los ua kev sim los xaiv cov txheej txheem ua noj kom tsim nyog.

Raws li cov ntaub ntawv tsis zoo heev ntawm cov txiaj ntsig kev xeem orthogonal, qhov cuam tshuam ntawm peb yam ntawm kev ua noj ua haus yog raws li hauv qab no: ua noj kub> alkali nyiaj> tuav lub sijhawm. Qhov ua noj kub thiab qhov nyiaj ntawm alkali muaj kev cuam tshuam zoo rau viscosity thiab whiteness ntawm paj rwb pulp. Nrog rau qhov nce ntawm qhov kub thiab txias ntawm alkali, qhov whiteness nyhav nce, tab sis cov viscosity yuav txo qis. Rau kev tsim cov viscosity siab, kev ua noj nruab nrab yuav tsum tau txais ntau li ntau tau thaum ua kom cov xim dawb. Yog li ntawd, ua ke nrog cov ntaub ntawv sim, qhov kub ua noj yog 115°C, thiab tus nqi ntawm alkali siv yog 9%. Cov txiaj ntsig ntawm kev tuav lub sijhawm ntawm peb yam tseem ceeb yog qhov tsis muaj zog dua li ntawm ob yam. Txij li thaum qhov kev ua noj no siv txoj kev ua noj tsawg-alkali thiab kub qis, txhawm rau txhawm rau ua kom qhov sib xws ntawm kev ua noj thiab ua kom muaj kev ruaj ntseg ntawm kev ua noj viscosity, lub sijhawm tuav yog xaiv li 70 feeb. Yog li ntawd, kev sib xyaw ua ke A2B2C3 tau txiav txim siab ua cov txheej txheem ua noj zoo tshaj plaws rau cov viscosity siab. Raws li cov txheej txheem kev tsim khoom, cov xim dawb ntawm cov tawv nqaij kawg yog 55.3%, thiab cov viscosity yog 1945 mL / g.

2.3 Cov txheej txheem tshuaj dawb

2.3.1 Pre-chlorination txheej txheem

Hauv seem ua ntej chlorination, ib qho me me ntawm sodium hypochlorite yog ntxiv rau cov paj rwb kom hloov cov lignin hauv paj rwb pulp rau hauv chlorinated lignin thiab yaj. Tom qab bleaching nyob rau hauv lub pre-chlorination theem, lub viscosity ntawm slurry yuav tsum tau tswj kom ua.≥1850 mL / g, thiab whiteness≥63%.

Tus nqi ntawm sodium hypochlorite yog qhov tseem ceeb uas cuam tshuam rau cov tshuaj bleaching hauv seem no. Txhawm rau txhawm rau tshawb xyuas qhov tsim nyog ntawm cov tshuaj chlorine, ib txoj hauv kev sim ntsuas ib leeg tau siv los ua 5 qhov kev sim sib luag tib lub sijhawm. Los ntawm qhov sib txawv ntawm sodium hypochlorite nyob rau hauv slurry, cov tshuaj chlorine zoo nyob rau hauv slurry Cov ntsiab lus chlorine yog 0.01 g / L, 0.02 g / L, 0.03 g / L, 0.04 g / L, 0.05 g / L raws li. Tom qab bleaching, viscosity thiab BaiDu.

Los ntawm cov kev hloov ntawm paj rwb pulp whiteness thiab viscosity nrog tus nqi ntawm cov tshuaj chlorine, nws tuaj yeem pom tias nrog kev nce ntawm cov tshuaj chlorine, cov xim dawb ntawm paj rwb yuav maj mam nce, thiab cov viscosity maj mam txo. Thaum muaj cov tshuaj chlorine yog 0.01g / L thiab 0.02g / L, qhov dawb ntawm paj rwb pulp yog≤63% yog '; Thaum muaj cov tshuaj chlorine yog 0.05g / L, viscosity ntawm paj rwb pulp yog≤1850mL / g, uas tsis ua raws li cov kev cai ua ntej chlorination. Segment bleaching tswj qhov taw qhia yuav tsum. Thaum muaj cov tshuaj chlorine yog 0.03g / L thiab 0.04g / L, cov ntsuas tom qab bleaching yog viscosity 1885mL / g, whiteness 63.5% thiab viscosity 1854mL / g, whiteness 64.8%. Qhov ntau npaum li cas yog ua raws li qhov yuav tsum tau ua ntawm cov tshuaj bleaching tswj hauv ntu ua ntej chlorination, yog li nws tau txiav txim siab ua ntej tias cov tshuaj chlorine muaj nyob rau hauv ntu no yog 0.03-0.04g / L.

2.3.2 Hydrogen peroxide theem bleaching txheej txheem tshawb fawb

Hydrogen peroxide bleaching yog qhov tseem ceeb tshaj plaws bleaching theem nyob rau hauv cov txheej txheem bleaching los txhim kho cov whiteness. Tom qab theem no, ib theem ntawm kev kho cov kua qaub yog nqa tawm kom tiav cov txheej txheem bleaching. Cov theem kho acid ntxiv rau cov ntawv tom ntej thiab cov txheej txheem tsim tsis muaj kev cuam tshuam rau cov viscosity ntawm cov ntaub so ntswg, thiab tuaj yeem ua kom cov xim dawb los ntawm tsawg kawg 2%. Yog li, raws li kev tswj hwm qhov ntsuas qhov xav tau ntawm qhov kawg high-viscosity pulp, qhov ntsuas ntsuas qhov xav tau ntawm hydrogen peroxide bleaching theem tau txiav txim siab ua viscosity.≥1800 mL / g thiab dawb≥83%.

Lub ntsiab tseem ceeb cuam tshuam rau hydrogen peroxide bleaching yog tus nqi ntawm hydrogen peroxide, bleaching kub, thiab lub sij hawm bleaching. Txhawm rau kom ua tiav qhov kev xav tau ntawm cov xim dawb thiab viscosity ntawm cov kua nplaum siab, peb yam cuam tshuam rau cov tshuaj bleaching tau soj ntsuam los ntawm orthogonal xeem txoj kev los txiav txim qhov tsim nyog hydrogen peroxide bleaching txheej txheem tsis.

Los ntawm cov ntaub ntawv sib txawv heev ntawm qhov kev ntsuam xyuas orthogonal, nws pom tau tias qhov cuam tshuam ntawm peb yam ntawm cov tshuaj bleaching yog: bleaching kub> hydrogen peroxide ntau npaum> bleaching lub sij hawm. Qhov kub thiab txias thiab qhov nyiaj ntawm hydrogen peroxide yog qhov tseem ceeb cuam tshuam rau cov nyhuv bleaching. Nrog rau qhov maj mam nce ntawm cov ntaub ntawv ntawm ob yam ntawm cov tshuaj dawb thiab cov nyiaj ntawm hydrogen peroxide, cov xim dawb ntawm cov paj rwb tau maj mam nce, thiab cov viscosity maj mam txo. Xav txog cov nqi tsim khoom, cov cuab yeej muaj peev xwm thiab cov khoom lag luam zoo tag nrho, qhov ntsuas kub ntawm hydrogen peroxide tau txiav txim siab yog 80°C, thiab cov tshuaj hydrogen peroxide yog 5%. Nyob rau tib lub sijhawm, raws li kev sim cov txiaj ntsig, lub sijhawm tshuaj dawb ntawm hydrogen peroxide muaj kev cuam tshuam me ntsis ntawm cov tshuaj bleaching, thiab ib-theem bleaching lub sij hawm ntawm hydrogen peroxide raug xaiv li 80 feeb.

Raws li kev xaiv hydrogen peroxide theem bleaching txheej txheem, lub chaw soj nstuam tau ua ib tug loj tus naj npawb ntawm rov ua pov thawj thwmsim, thiab cov kev sim pom tau hais tias qhov kev sim tsis muaj peev xwm ua tau raws li lub hom phiaj xav tau.

3. Cov lus xaus

Raws li cov neeg siv khoom xav tau, dhau los ntawm ib qho kev xeem thiab kev xeem orthogonal, ua ke nrog lub tuam txhab cov cuab yeej siv tiag tiag thiab cov nqi tsim khoom, cov txheej txheem ntau lawm ntawm cov ntaub ntawv siab viscosity rau cellulose ether tau txiav txim siab raws li hauv qab no: (1) Cov txheej txheem ua noj: siv 9 % ntawm alkali, ua noj Qhov kub yog 115°C, thiab lub sijhawm tuav yog 70 feeb. (2) Bleaching txheej txheem: nyob rau hauv lub pre-chlorination seem, qhov ntau npaum ntawm cov tshuaj chlorine rau bleaching yog 0.03-0.04 g / L; Hauv seem hydrogen peroxide, qhov tshuaj dawb yog 80°C, ntau npaum li cas ntawm hydrogen peroxide yog 5%, thiab lub sij hawm bleaching yog 80 feeb; Acid kho seem, raws li lub tuam txhab cov txheej txheem.

High viscosity pulp raucellulose etheryog ib tug tshwj xeeb paj rwb pulp nrog daim ntawv thov dav thiab siab ntxiv tus nqi. Raws li kev sim ntau, lub tuam txhab ywj pheej tsim cov txheej txheem ntawm cov ntaub ntawv siab-viscosity rau cellulose ether. Tam sim no, high-viscosity pulp rau cellulose ether tau dhau los ua ib qho ntawm Kima Chemical tuam txhab cov khoom tseem ceeb, thiab cov khoom lag luam zoo tau lees paub thiab qhuas los ntawm cov neeg siv khoom hauv tsev thiab txawv teb chaws.