Yuav ua li cas npaj methyl hydroxyethyl cellulose?

Keeb Kwm thiab Txheej Txheem Cej Luam

Cellulose ether yog cov khoom siv polymer zoo uas siv dav dav ua los ntawm cov polymer cellulose ntuj los ntawm kev kho tshuaj. Tom qab kev tsim cov cellulose nitrate thiab cellulose acetate hauv xyoo pua 19th, cov kws tshuaj tau tsim ntau yam cellulose derivatives ntawm ntau cellulose ethers, thiab cov teb thov tshiab tau raug tshawb pom tas li, uas cuam tshuam nrog ntau lub lag luam. Cov khoom lag luam Cellulose ether xws li sodiumcarboxymethyl cellulose (CMC), ethyl cellulose (EC), Hydroxyethyl Cellulose (HEC), Hydroxypropyl cellulose (HPC), methyl hydroxyethyl cellulose (MHEC)thiabmethyl hydroxypropyl cellulose (MHPC)thiab lwm yam cellulose ethers hu ua "industrial monosodium glutamate" thiab tau siv dav hauv kev khawb roj, kev tsim kho, kev pleev xim, khoom noj, tshuaj thiab tshuaj txhua hnub.

Hydroxyethyl methyl cellulose (MHPC) yog ib hom hmoov dawb uas tsis muaj ntxhiab, tsis muaj saj, thiab tsis muaj tshuaj lom uas yaj tau hauv dej txias kom ua tau ib yam khoom uas muaj viscosity pob tshab. Nws muaj cov yam ntxwv ntawm kev ua kom tuab, khi, tawg, emulsifying, tsim zaj duab xis, dai, nqus, gelling, ua haujlwm rau saum npoo, tswj cov dej noo thiab tiv thaiv colloid. Vim yog lub luag haujlwm ntawm cov kua dej, nws tuaj yeem siv ua tus neeg sawv cev tiv thaiv colloidal, emulsifier thiab dispersant. Hydroxyethyl methylcellulose aqueous solution muaj hydrophilicity zoo thiab yog ib qho khoom siv khaws dej zoo. Vim tias hydroxyethyl methylcellulose muaj hydroxyethyl pawg, nws muaj peev xwm tiv thaiv pwm zoo, ruaj khov viscosity zoo thiab tiv thaiv pwm thaum khaws cia ntev.

Hydroxyethyl methylcellulose (HEMC) yog npaj los ntawm kev qhia txog ethylene oxide substituents (MS 0.3 ~ 0.4) rau hauv methylcellulose (MC), thiab nws cov ntsev tsis kam zoo dua li ntawm cov polymers tsis hloov kho. Qhov kub gelation ntawm methylcellulose kuj siab dua li ntawm MC.

Qauv

Feature

Cov yam ntxwv tseem ceeb ntawm hydroxyethyl methylcellulose (HEMC) yog:

1. Kev yaj: Yaj tau hauv dej thiab qee cov kuab tshuaj organic. HEMC tuaj yeem yaj hauv dej txias. Nws qhov kev sib xyaw siab tshaj plaws tsuas yog txiav txim siab los ntawm viscosity. Kev yaj sib txawv nrog viscosity. Qhov viscosity qis dua, qhov solubility ntau dua.

2. Kev tiv taus ntsev: Cov khoom HEMC yog cov cellulose ethers uas tsis yog ionic thiab tsis yog polyelectrolytes, yog li lawv ruaj khov hauv cov kua dej thaum muaj cov ntsev hlau lossis cov electrolytes organic, tab sis kev ntxiv electrolytes ntau dhau tuaj yeem ua rau gelation thiab nag lossis daus.

3. Kev Ua Haujlwm Ntawm Qhov Chaw: Vim yog qhov ua haujlwm ntawm qhov chaw ntawm cov kua dej, nws tuaj yeem siv ua tus neeg sawv cev tiv thaiv colloidal, emulsifier thiab dispersant.

4. Thermal gel: Thaum cov kua dej ntawm HEMC cov khoom raug cua sov rau qee qhov kub, nws dhau los ua opaque, gels, thiab precipitates, tab sis thaum nws txias tas li, nws rov qab mus rau lub xeev kua thawj, thiab qhov kub uas cov gel thiab nag los no tshwm sim feem ntau yog nyob ntawm lawv cov roj nplua nyeem, cov khoom pab ncua, cov colloids tiv thaiv, emulsifiers thiab lwm yam.

5. Kev tsis muaj zog ntawm kev zom zaub mov thiab tsis muaj ntxhiab tsw qab: HEMC siv dav hauv cov khoom noj thiab tshuaj vim tias nws yuav tsis raug zom thiab muaj ntxhiab tsw qab thiab tsis muaj ntxhiab tsw qab.

6. Kev tiv thaiv pwm: HEMC muaj kev tiv thaiv pwm zoo thiab kev ruaj khov viscosity zoo thaum lub sijhawm khaws cia ntev.

7. PH ruaj khov: Qhov viscosity ntawm cov kua dej ntawm HEMC cov khoom tsis tshua cuam tshuam los ntawm acid lossis alkali, thiab tus nqi pH ruaj khov nyob rau hauv qhov ntau ntawm 3.0 txog 11.0.

Daim Ntawv Thov

Hydroxyethyl methylcellulose siv tau ua tus neeg sawv cev tiv thaiv colloidal, emulsifier thiab dispersant vim nws muaj zog ua haujlwm hauv cov kua dej. Cov piv txwv ntawm nws daim ntawv thov yog raws li nram no:

1. Cov nyhuv ntawm hydroxyethyl methylcellulose rau kev ua haujlwm ntawm cov cement. Hydroxyethyl methylcellulose yog ib hom hmoov dawb uas tsis muaj ntxhiab, tsis muaj saj, thiab tsis muaj tshuaj lom uas tuaj yeem yaj rau hauv dej txias kom ua tau ib qho kua nplaum pob tshab. Nws muaj cov yam ntxwv ntawm kev ua kom tuab, khi, tawg, emulsifying, tsim zaj duab xis, suspending, adsorbing, gelling, surfactant, tswj cov dej noo thiab tiv thaiv colloid. Vim tias cov kua dej muaj lub luag haujlwm ntawm surfactant, nws tuaj yeem siv ua tus neeg sawv cev tiv thaiv colloidal, emulsifier thiab dispersant. Hydroxyethyl methylcellulose aqueous solution muaj hydrophilicity zoo thiab yog ib qho tshuaj zoo khaws dej.

2. Npaj ib daim xim pleev xim uas yooj ywm heev, uas yog ua los ntawm cov khoom siv raw li nram no ua ntu zus raws li qhov hnyav: 150-200 g ntawm dej deionized; 60-70 g ntawm acrylic emulsion ntshiab; 550-650 g ntawm calcium hnyav; 70-90 g ntawm hmoov talcum; Base cellulose aqueous kua 30-40g; lignocellulose aqueous kua 10-20g; zaj duab xis-tsim pab 4-6g; antiseptic thiab fungicide 1.5-2.5g; dispersant 1.8-2.2g; wetting agent 1.8-2.2g; 3.5-4.5g; Ethylene glycol 9-11g; Cov hydroxyethyl methylcellulose aqueous kua yog ua los ntawm kev yaj 2-4% hydroxyethyl methylcellulose hauv dej; Cov lignocellulose aqueous kua yog ua los ntawm 1-3% Lignocellulose yog ua los ntawm kev yaj hauv dej.

Kev Npaj

Ib txoj kev npaj ntawm hydroxyethyl methyl cellulose, txoj kev yog siv paj rwb refined ua cov khoom siv raw, thiab ethylene oxide siv ua tus neeg sawv cev etherification los npaj hydroxyethyl methyl cellulose. Qhov hnyav ntawm cov khoom siv raw rau kev npaj hydroxyethyl methylcellulose yog raws li nram no: 700-800 qhov ntawm toluene thiab isopropanol sib tov ua cov kuab tshuaj, 30-40 qhov dej, 70-80 qhov ntawm sodium hydroxide, 80-85 qhov ntawm paj rwb refined, nplhaib 20-28 qhov ntawm oxy ethane, 80-90 qhov ntawm methyl chloride, 16-19 qhov ntawm glacial acetic acid; cov kauj ruam tshwj xeeb yog:

Kauj ruam thawj zaug, hauv lub lauj kaub tshuaj tiv thaiv, ntxiv toluene thiab isopropanol sib tov, dej, thiab sodium hydroxide, cua sov txog li 60-80 ° C, ua kom sov li 20-40 feeb;

Kauj ruam thib ob, alkalization: txias cov ntaub ntawv saum toj no rau 30-50 ° C, ntxiv paj rwb zoo, tsuag cov tshuaj toluene thiab isopropanol sib tov, nqus tsev rau 0.006Mpa, sau nitrogen rau 3 qhov hloov pauv, thiab nqa tawm tom qab hloov Alkalinization, cov xwm txheej alkalization yog: lub sijhawm alkalization yog 2 teev, thiab qhov kub alkalization yog 30 ° C txog 50 ° C;

Kauj ruam thib peb, etherification: tom qab ua tiav alkalization, lub reactor raug tshem tawm mus rau 0.05-0.07MPa, thiab ethylene oxide thiab methyl chloride ntxiv rau 30-50 feeb; thawj theem ntawm etherification: 40-60 ° C, 1.0-2.0 Teev, lub siab raug tswj ntawm 0.15 thiab 0.3Mpa; theem ob ntawm etherification: 60 ～ 90 ℃, 2.0 ～ 2.5 teev, lub siab raug tswj ntawm 0.4 thiab 0.8Mpa;

Kauj ruam plaub, kev ua kom tsis muaj zog: ntxiv cov kua qaub glacial acetic acid uas ntsuas ua ntej rau hauv lub lauj kaub dej nag, nias rau hauv cov khoom siv etherified rau kev ua kom tsis muaj zog, tsa qhov kub thiab txias mus rau 75-80 ° C rau nag, qhov kub nce mus txog 102 ° C, thiab tus nqi pH raug pom tias yog 6 Thaum 8 teev, qhov kev ua kom tsis muaj zog tiav lawm; lub tank desolventization puv nrog cov dej kais kho los ntawm lub cuab yeej osmosis rov qab ntawm 90 ° C txog 100 ° C;

Kauj ruam thib tsib, kev ntxuav centrifugal: cov khoom siv hauv kauj ruam thib plaub yog centrifuged los ntawm lub centrifuge ntsia hlau kab rov tav, thiab cov khoom sib cais raug xa mus rau lub tank ntxuav uas muaj dej kub ua ntej rau kev ntxuav cov khoom siv;

Kauj ruam thib rau, kev ziab centrifugal: cov khoom ntxuav tau xa mus rau hauv lub tshuab ziab khaub ncaws los ntawm lub tshuab centrifuge kab rov tav, thiab cov khoom raug ziab ntawm 150-170 ° C, thiab cov khoom qhuav raug tsoo thiab ntim.

Piv nrog rau cov thev naus laus zis tsim cov cellulose ether uas twb muaj lawm, qhov kev tsim kho tshiab no siv ethylene oxide ua tus neeg sawv cev etherification los npaj hydroxyethyl methyl cellulose, uas muaj kev tiv thaiv kab mob mildew zoo vim muaj cov pab pawg hydroxyethyl. Nws muaj kev ruaj khov viscosity zoo thiab kev tiv thaiv kab mob mildew thaum lub sijhawm khaws cia ntev. Nws tuaj yeem siv hloov lwm cov cellulose ethers.