Nhoroondo uye Pfupiso
Cellulose ether imhando yemakemikari inoshandiswa zvakanyanya yakagadzirwa nepolymer cellulose yechisikigo kuburikidza nekurapa nemakemikari. Mushure mekugadzirwa kwecellulose nitrate ne cellulose acetate muzana remakore rechi19, makhemisi akagadzira mhando dzakasiyana dze cellulose derivatives dze cellulose ethers dzakawanda, uye nzvimbo itsva dzekushandisa dzakawanikwa nguva dzose, dzinosanganisira maindasitiri akawanda. Zvigadzirwa zveCellulose ether zvakaita se sodiumcarboxymethyl cellulose (CMC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), methyl hydroxyethyl cellulose (MHEC)uyemethyl hydroxypropyl cellulose (MHPC)uye mamwe ma ether e cellulose anozivikanwa se "industrial monosodium glutamate" uye ave achishandiswa zvakanyanya mukuchera mafuta, kuvaka, kuputira, chikafu, mishonga uye makemikari ezuva nezuva.
Hydroxyethyl methyl cellulose (MHPC) ihupfu huchena husina hwema, husina kunaka, husina chepfu hunogona kunyungudutswa mumvura inotonhora kuti hugadzire mhinduro yakajeka ine viscous. Ine hunhu hwekukora, kusunga, kuparadzira, emulsifying, kugadzira firimu, kumisa, kunyungudutsa, gelling, surface active, kuchengetedza hunyoro uye kuchengetedza colloid. Nekuda kwebasa rinoitwa pamusoro pemvura, inogona kushandiswa se colloidal protective agent, emulsifier uye dispersant. Hydroxyethyl methylcellulose aqueous solution ine hydrophilicity yakanaka uye inoshanda kuchengetedza mvura. Nekuti hydroxyethyl methylcellulose ine hydroxyethyl groups, ine kugona kwakanaka kwekudzivirira ganda, kugadzikana kwakanaka kwe viscosity uye kuramba ganda panguva yekuchengetwa kwenguva refu.
Hydroxyethyl methylcellulose (HEMC) inogadzirwa nekuisa ethylene oxide substituents (MS 0.3 ~ 0.4) mu methylcellulose (MC), uye kuramba kwayo munyu kuri nani pane kwema polymers asina kugadziriswa. Tembiricha ye gelation ye methylcellulose yakakwirawo kupfuura ye MC.
Maumbirwo
Chinhu
Hunhu hukuru hwehydroxyethyl methylcellulose (HEMC) ndehwekuti:
1. Kunyungudika: Inonyungudika mumvura nezvimwe zvinonyungudika zve organic. HEMC inogona kunyungudika mumvura inotonhora. Kuwanda kwayo kwakanyanya kunongoonekwa nekunyungudika. Kunyungudika kunosiyana nekunyungudika. Kunyungudika kwakaderera, ndiko kukura kwekunyungudika.
2. Kusagona munyu: Zvigadzirwa zveHEMC hazvina maether e-cellulose uye hazvisi mapolyelectrolyte, saka zvinogadzikana mumvura kana paine munyu wesimbi kana maelectrolyte eorganic, asi kuwanda kwemaelectrolyte kunogona kukonzera gelation uye kunaya kwemvura.
3. Kushanda pamusoro: Nekuda kwebasa remvura rinoita pamusoro, rinogona kushandiswa semushonga unodzivirira wecolloidal, emulsifier uye dispersant.
4. Thermal gel: Kana mvura inobuda mu HEMC products ikapiswa kusvika patembiricha yakati, inova isina kujeka, ma gel, uye inonaya, asi kana ikaramba ichitonhodzwa, inodzokera pamamiriro ekutanga e solution, uye tembiricha iyo gel iyi ne naisure zvinoitika inonyanya kuenderana nemafuta, suspending aids, protective colloids, emulsifiers nezvimwewo.
5. Kusashanda zvakanaka kwemetabolism uye kunhuhwirira kushoma uye kunhuhwirira: HEMC inoshandiswa zvakanyanya mukudya nemumishonga nekuti haizogayiwi uye ine kunhuhwirira kushoma uye kunhuhwirira kushoma.
6. Kudzivirira fungus: HEMC ine kusimba kwakanaka kwefungus uye kusimba kwakanaka kwekusimba panguva yekuchengetwa kwenguva refu.
7. Kugadzikana kwePH: Kusimba kwemvura inobuda muHEMC hakukanganisike zvakanyanya neacid kana alkali, uye pH yakagadzikana zviri pakati pe3.0 kusvika 11.0.
Kushandiswa
Hydroxyethyl methylcellulose inogona kushandiswa semushonga unodzivirira wecolloidal, emulsifier uye dispersant nekuda kwebasa rayo repamusoro mumushonga wemvura. Mienzaniso yekushandiswa kwayo ndeiyi inotevera:
1. Mhedzisiro yehydroxyethyl methylcellulose pakushanda kwesimende. Hydroxyethyl methylcellulose upfu huchena husina hwema, husina kunaka, husina chepfu hunogona kunyungudutswa mumvura inotonhora kuti hugadzire mhinduro yakajeka ine viscous. Ine hunhu hwekukora, kusunga, kuparadzira, emulsifying, kugadzira firimu, kumisa, kunyungudutsa, gelling, surface active, kuchengetedza hunyoro uye kuchengetedza colloid. Sezvo mhinduro yemvura iine basa rekushanda pamusoro, inogona kushandiswa se colloidal protective agent, emulsifier uye dispersant. Hydroxyethyl methylcellulose aqueous solution ine hydrophilicity yakanaka uye inoshanda zvakanaka kuchengetedza mvura.
2. Pendi inochinjika zvikuru inogadzirwa, iyo inogadzirwa nezvinhu zvinotevera muzvikamu nehuremu: 150-200 g yemvura yakabviswa ion; 60-70 g ye emulsion yakachena ye acrylic; 550-650 g ye calcium yakawanda; 70-90 g ye talcum powder; Base cellulose aqueous solution 30-40g; lignocellulose aqueous solution 10-20g; film-forming aid 4-6g; antiseptic uye fungicide 1.5-2.5g; dispersant 1.8-2.2g; wetting agent 1.8-2.2g; 3.5-4.5g; Ethylene glycol 9-11g; Hyxyethyl methylcellulose aqueous solution inogadzirwa nekunyungudutsa 2-4% hydroxyethyl methylcellulose mumvura; Lignocellulose aqueous solution inogadzirwa ne 1-3% Lignocellulose inogadzirwa nekunyungudutsa mumvura.
Kugadzirira
Nzira yekugadzirira hydroxyethyl methyl cellulose, nzira yacho ndeyekuti donje rakacheneswa rinoshandiswa sezvinhu zvisina kugadzirwa, uye ethylene oxide inoshandiswa se etherification agent kugadzira hydroxyethyl methyl cellulose. Zvikamu zvehuremu hwezvinhu zvisina kugadzirwa zvekugadzira hydroxyethyl methylcellulose ndeizvi: zvikamu 700-800 zvemusanganiswa we toluene ne isopropanol se solvent, zvikamu 30-40 zvemvura, zvikamu 70-80 zve sodium hydroxide, zvikamu 80-85 zve donje rakacheneswa, ring zvikamu 20-28 zve oxy ethane, zvikamu 80-90 zve methyl chloride, zvikamu 16-19 zve glacial acetic acid; matanho chaiwo ndeaya:
Danho rekutanga, mukettle ye reaction, wedzera musanganiswa we toluene ne isopropanol, mvura, uye sodium hydroxide, pisa kusvika 60-80 ° C, chengeta uchidziya kwemaminitsi 20-40;
Danho rechipiri, alkalizing: tonhodza zvinhu zvataurwa pamusoro apa kusvika pa30-50°C, wedzera donje rakacheneswa, pfapfaidza toluene neisopropanol musanganiswa wemvura, bvisa vacuum kusvika pa0.006Mpa, zadza nitrogen katatu, wobva waita Alkalinization mushure mekutsiva, mamiriro ealkalizing ndeaya: nguva yealkalizing maawa maviri, uye tembiricha yealkalizing iri pa30°C kusvika pa50°C;
Danho rechitatu, etherification: mushure mekunge alkaliization yapera, reactor inobviswa kuenda ku0.05-0.07MPa, uye ethylene oxide nemethyl chloride zvinowedzerwa kwemaminitsi 30-50; danho rekutanga re etherification: 40-60°C, 1.0-2.0 Maawa, kumanikidzwa kunodzorwa pakati pe0.15 ne0.3Mpa; danho rechipiri re etherification: 60～90℃, 2.0～2.5 maawa, kumanikidzwa kunodzorwa pakati pe0.4 ne0.8Mpa;
Danho rechina, kubvisa tsvina: wedzera glacial acetic acid yakayerwa pachine nguva mukettle yemvura, dzvanya muzvinhu zvakanyungudutswa kuti zvisatsvedzere, simudza tembiricha kusvika 75-80°C kuti mvura itsvedzere, tembiricha inokwira kusvika 102°C, uye pH value inoonekwa kuti iri 6. Pana 8 o'clock, kubvisa tsvina kwapera; tangi rekubvisa tsvina rinozadzwa nemvura yepombi inogadziriswa ne reverse osmosis device pa 90°C kusvika 100°C;
Danho rechishanu, kugeza uchishandisa centrifugal: chinhu chiri mudanho rechina chinoiswa pakati nepakati kuburikidza ne centrifuge yakatambanudzwa, uye chinhu chakaparadzaniswa chinoendeswa kutangi rekugeza rakazadzwa nemvura inopisa pachine nguva kuti chisuke chinhu chacho;
Danho rechitanhatu, kuomesa uchishandisa centrifugal: zvinhu zvakagezwa zvinoendeswa mudryer kuburikidza ne centrifuge yakatambanudzwa, uye zvinhu zvinoomeswa pa 150-170°C, uye zvinhu zvakaomeswa zvinopwanywa uye zvinorongedzwa.
Zvichienzaniswa netekinoroji iripo yekugadzira cellulose ether, chigadzirwa ichi chinoshandisa ethylene oxide semushonga we etherification kugadzira hydroxyethyl methyl cellulose, iyo ine simba rakanaka rekudzivirira mildew nekuda kwekuva nemapoka e hydroxyethyl. Ine simba rakanaka rekudzivirira mildew uye simba rakanaka rekudzivirira mildew panguva yekuchengetwa kwenguva refu. Inogona kushandiswa panzvimbo pemamwe ma cellulose ethers.
Nguva yekutumira: Kubvumbi-25-2024