Background uye Overview
Cellulose ether inoshandiswa zvakanyanya polymer yakanaka makemikari zvinhu zvakagadzirwa kubva kune zvakasikwa polymer cellulose kuburikidza nemakemikari kurapwa. Mushure mekugadzirwa kwe cellulose nitrate uye cellulose acetate muzana ramakore re19, vemakemikari vakagadzira nhevedzano yemaselulosi anobva kune akawanda cellulose ethers, uye minda mitsva yekushandisa yakawanikwa nguva dzose, inosanganisira akawanda maindasitiri. Cellulose ether zvigadzirwa zvakadai sodiumCarboxymethyl cellulose (CMC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), methyl hydroxyethyl cellulose (MHEC)uyemethyl hydroxypropyl cellulose (MHPC)uye mamwe cellulose ethers anozivikanwa se "industrial monosodium glutamate" uye akashandiswa zvakanyanya mukuchera mafuta, kuvaka, machira, chikafu, mushonga uye makemikari ezuva nezuva.
Hydroxyethyl methyl cellulose (MHPC) inonhuhwirira, isinganakidze, isina-chepfu chena poda inogona kunyungudutswa mumvura inotonhora kuti iite yakajeka viscous mhinduro. Iine maitiro ekukora, kusunga, kuparadzira, emulsifying, firimu-kuumba, kumisa, adsorbing, gelling, pamusoro pekushanda, kuchengetedza unyoro nekudzivirira colloid. Nekuda kwenzvimbo dzinoshanda basa reiyo aqueous solution, inogona kushandiswa se colloidal inodzivirira agent, emulsifier uye dispersant. Hydroxyethyl methylcellulose aqueous solution ine yakanaka hydrophilicity uye inoshanda inochengetedza mvura. Nekuti hydroxyethyl methylcellulose ine hydroxyethyl mapoka, ine yakanaka anti-mildew kugona, yakanaka viscosity kugadzikana uye huturu kuramba panguva yekuchengetedza kwenguva refu.
Hydroxyethyl methylcellulose (HEMC) inogadzirirwa nekuisa ethylene oxide substituents (MS 0.3 ~ 0.4) mu methylcellulose (MC), uye kurwisana kwayo kwemunyu kuri nani pane iyo isina kugadziriswa mapolymers. Iyo tembiricha yegelation yemethylcellulose zvakare yakakwira kupfuura iyo yeMC.
Chimiro
Feature
Iwo makuru maitiro ehydroxyethyl methylcellulose (HEMC) ndeaya:
1. Solubility: Solubility mumvura uye zvimwe organic solvents. HEMC inogona kunyungudika mumvura inotonhora. Kunyanya kwayo kwepamusoro kunongogadziriswa ne viscosity. Solubility inosiyana ne viscosity. Iyo yakaderera viscosity, iyo yakakura solubility.
2. Kuramba kwemunyu: HEMC zvigadzirwa hazvisi-ionic cellulose ethers uye haisi polyelectrolytes, saka inenge yakagadzikana mumagetsi emvura kana simbi yemunyu kana organic electrolytes iripo, asi kuwedzera kwakanyanya kwe electrolytes kunogona kukonzera gelation uye kunaya kwemvura.
3. Chiitiko chepamusoro: Pamusana pebasa rinoshanda remushonga wemvura, inogona kushandiswa secolloidal protective agent, emulsifier uye dispersant.
4. Thermal gel: Kana mhinduro yemvura yeHEMC inopisa kune imwe tembiricha, inova opaque, gels, uye precipitates, asi kana ikaramba ichitonhora, inodzokera kune yekutanga kugadzirisa mamiriro, uye tembiricha iyo iyo gel uye kunaya kwemvura kunoitika kunonyanya Zvichienderana navo mafuta ekuzora, kumisa aids, emuls inodzivirira, emuls aids.
5. Metabolic inertness uye kunhuhwirira kwakaderera uye kunhuhwirira: HEMC inoshandiswa zvakanyanya mukudya nemishonga nokuti haizogadziriswi uye ine kunhuhwirira kwakaderera uye kunhuhwirira.
6. Mildew resistance: HEMC ine huturu hwakanaka hunodzivirira uye yakanaka viscosity kugadzikana panguva yekuchengetedza kwenguva refu.
7. PH kugadzikana: The viscosity yeaqueous solution yeHEMC zvigadzirwa hazvinyanyi kukanganiswa neasidhi kana alkali, uye pH inokosha inenge yakagadzikana mukati mehuwandu hwe3.0 kusvika ku11.0.
Application
Hydroxyethyl methylcellulose inogona kushandiswa se colloidal inodzivirira agent, emulsifier uye dispersant nekuda kwekushanda kwayo kwepamusoro-inoshanda mumushonga wemvura. Mienzaniso yekushandiswa kwayo ndeiyi inotevera:
1. Mhedzisiro yehydroxyethyl methylcellulose pakuita simende. Hydroxyethyl methylcellulose inonhuhwirira, isinganakidze, isina-chepfu chena poda inogona kunyungudutswa mumvura inotonhora kuti igadzire inoonekera. Iine maitiro ekukora, kusunga, kuparadzira, emulsifying, firimu-kuumba, kumisa, adsorbing, gelling, pamusoro pekushanda, kuchengetedza unyoro nekudzivirira colloid. Sezvo mhinduro ine mvura ine nzvimbo inoshanda basa, inogona kushandiswa se colloidal inodzivirira agent, emulsifier uye dispersant. Hydroxyethyl methylcellulose aqueous solution ine yakanaka hydrophilicity uye inoshanda inochengetedza mvura.
2. Pendi yekuyamura yakanyatsogadziriswa inogadzirirwa, iyo inogadzirwa nezvinhu zvinotevera zvakasvibiswa muzvikamu nekurema: 150-200 g yemvura yakasvibiswa; 60-70 g ye pure acrylic emulsion; 550-650 g ye calcium yakawanda; 70-90 g yehupfu hwetalcum; Base cellulose aqueous solution 30-40g; lignocellulose aqueous mhinduro 10-20g; firimu-kugadzira rubatsiro 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; Iyo hydroxyethyl methylcellulose aqueous solution inogadzirwa nekunyungudutsa 2-4% hydroxyethyl methylcellulose mumvura; Iyo lignocellulose aqueous solution inogadzirwa ne1-3% Lignocellulose inogadzirwa nekunyungudika mumvura.
Kugadzirira
Nzira yekugadzirira yehydroxyethyl methyl cellulose, iyo nzira ndeyokuti donje rakanatswa rinoshandiswa seyakagadzirwa, uye ethylene oxide inoshandiswa se etherification agent kugadzirira hydroxyethyl methyl cellulose. Huremu hwezvigadzirwa zvekugadzira hydroxyethyl methylcellulose ndeiyi: 700-800 zvikamu zve toluene uye isopropanol musanganiswa se solvent, 30-40 zvikamu zvemvura, 70-80 zvikamu zve sodium hydroxide, 80-85 zvikamu zvedonje rakanatswa, mhete 20-28 zvikamu zve8 oxy methylchloride, 16-19 zvikamu zveglacial acetic acid; matanho chaiwo ndeaya:
Danho rekutanga, mukuita kettle, wedzera toluene uye isopropanol musanganiswa, mvura, uye sodium hydroxide, kupisa kusvika 60-80 ° C, ramba uchidziya kwemaminitsi 20-40;
Danho rechipiri, alkalization: tonhodza zvinhu zviri pamusoro kusvika 30-50 ° C, wedzera donje rakanatswa, pfapfaidza toluene uye isopropanol musanganiswa wekunyungudutsa, vacuumize kusvika 0.006Mpa, zadza nitrogen yekutsiva 3, uye ita mushure mekutsiva Alkalinization, iyo alkalization mamiriro ndeiyi: iyo alkalization nguva inosvika maawa maviri, kusvika 50 ° C °, uye alkalization ye50 ° C.
Nhanho yechitatu, etherification: mushure mokunge alkalization yapera, reactor inobudiswa kune 0.05-0.07MPa, uye ethylene oxide uye methyl chloride inowedzerwa kwemaminitsi makumi matatu-50; chikamu chekutanga che etherification: 40-60 ° C, 1.0-2.0 Maawa, kudzvinyirira kunodzorwa pakati pe0.15 ne0.3Mpa; chikamu chechipiri che etherification: 60～90℃, 2.0～2.5 maawa, kumanikidzwa kunodzorwa pakati pe0.4 ne0.8Mpa;
Danho rechina, neutralization: wedzera kuyerwa glacial acetic acid in advance kune precipitation kettle, press into etherified material for neutralization, simudza tembiricha kusvika 75-80 ° C kuitira kunaya, tembiricha inokwira kusvika 102 ° C, uye pH kukosha kunoonekwa kuva 6 Pa8 o'clock, desolventization inopedzwa; iyo desolventization tangi yakazadzwa nemvura yepombi inobatwa nereverse osmosis mudziyo pa90 ° C kusvika 100 ° C;
Nhanho yechishanu, centrifugal washing: zvinhu muchikamu chechina centrifuged kuburikidza nehorizontal screw centrifuge, uye iyo yakaparadzaniswa inotamirwa kune tangi yekuwachisa yakazadzwa nemvura inopisa mberi kwekugezwa kwezvinhu;
Nhanho yechitanhatu, kuomeswa kwe centrifugal: iyo yakashambidzwa inopinzwa muomesi kuburikidza nehorizontal screw centrifuge, uye iyo yakaomeswa pa 150-170 ° C, uye yakaomeswa yakapwanyika uye yakaputirwa.
Zvichienzaniswa nehunyanzvi hwekugadzira cellulose ether huripo, kugadzirwa kwazvino kunoshandisa ethylene oxide semushonga we etherification kugadzirira hydroxyethyl methyl cellulose, ine good resistance nekuda kweine hydroxyethyl mapoka. Iine yakanaka viscosity kugadzikana uye mildew kuramba panguva yekuchengetedza kwenguva refu. Inogona kushandiswa pane mamwe cellulose ethers.
Nguva yekutumira: Kubvumbi-25-2024