Hydroxyethyl methyl Cellulose

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 sodium carboxymethyl cellulose (CMC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), methyl hydroxyethyl cellulose (MHEC) uye methyl hydroxypropyl cellulose (MHPC) uye mamwe cellulose ethers anozivikanwa se. "industrial monosodium glutamate" uye yakashandiswa zvakanyanya mukuchera mafuta, kuvaka, kupfeka, chikafu, mushonga uye makemikari ezuva nezuva.

Hydroxyethyl methylcellulose(MHEC) 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 kweiyo yepamusoro inoshanda 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: Soluble mumvura uye mamwe 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 munyu: HEMC zvigadzirwa hazvisi-ionic cellulose ethers uye haisi polyelectrolytes, saka inenge yakagadzikana mumagetsi emvura kana munyu wesimbi kana organic electrolytes iripo, asi kuwedzera kwakanyanya kwe electrolytes kunogona kukonzera gelation uye kunaya kwemvura.
3. Chiitiko chepamusoro: Nekuda kwebasa rinoshanda remushonga wemvura, inogona kushandiswa secolloidal inodzivirira mumiriri, emulsifier uye dispersant.
4. Thermal gel: Kana iyo aqueous solution yeHEMC zvigadzirwa ichipisa kune imwe tembiricha, inova opaque, gels, uye inonaya, asi kana ikaramba ichitonhorera, inodzokera kune yekutanga mhinduro mamiriro, uye tembiricha iyo gel iyi uye kunaya kwemvura. zvinoitika zvakanyanya Zvichienderana nazvo mafuta ekuzora, kumisa aids, anodzivirira colloids, emulsifiers nezvimwe.
5. Metabolism inert uye kunhuhwirira kwakaderera uye kunhuhwirira: HEMC inoshandiswa zvakanyanya mukudya nemushonga nekuti haizogadziriswi uye ine kunhuhwirira kwakaderera uye kunhuhwirira.
6. Mildew kuramba: HEMC ine yakanaka mildew kuramba uye yakanaka viscosity kugadzikana panguva yekuchengetedza kwenguva refu.
7. PH kugadzikana: Iyo viscosity yeaqueous solution yeHEMC zvigadzirwa haitombokanganiswi neasidhi kana alkali, uye iyo pH kukosha haina kugadzikana mukati meiyo 3.0 kusvika 11.0.

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 iyo aqueous mhinduro ine pamusoro inoshingaira basa, inogona kushandiswa se colloidal inodzivirira agent, emulsifier uye dispersant. Hydroxyethyl methylcellulose aqueous solution ine yakanaka hydrophilicity uye inoshanda inochengetedza mvura.
2. Pendi yekuyamura ine kushanduka kwepamusoro 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; 30-40g base cellulose aqueous solution; 10-20g lignocellulose aqueous mhinduro; 4-6g film-forming aid; 1.5-2.5g antiseptic uye bactericide; 1.8-2.2g dispersant; 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 methylcellulose, iyo nzira ndeyokushandisa donje rakanatswa sechinhu chisina kuchena uye ethylene oxide semugadziri we etherification kugadzirira hydroxyethyl methylcellulose. Zvikamu zvehuremu zvekugadzira hydroxyethyl methyl cellulose zvinotevera: 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 zve oxyethane, 80-90 zvikamu zvemethyl chloride, 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: tonhoresa zvinhu zviri pamusoro kusvika 30-50 ° C, wedzera donje rakanatswa, pfapfaidza toluene uye isopropanol musanganiswa wekunyungudutsa, pombi kusvika ku0.006Mpa, zadza nitrogen yekutsiva katatu, uye ita mushure mekutsiva Alkalinization. alkalization mamiriro ndeiyi: nguva ye alkalization maawa maviri, uye tembiricha ye alkalization ndeye 30 ° C kusvika 50 ° 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 iyo yakayerwa glacial acetic acid in advance kune kettle yekunaya, dzvanya mune etherified material for neutralization, simudza tembiricha kusvika 75-80°C kuitira kunaya, tembiricha inokwira kusvika 102°C, uye pH. kukosha ndeye 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.

Kuenzaniswa neiyo iripo cellulose ether yekugadzira tekinoroji, kugadzirwa kwazvino kunoshandisa ethylene oxide seye etherification agent kugadzirira hydroxyethyl methyl cellulose, ine yakanaka anti-mold kugona nekuda kweine hydroxyethyl mapoka. Iine yakanaka viscosity kugadzikana uye mildew kuramba panguva yekuchengetedza kwenguva refu. Inogona kushandiswa pane mamwe cellulose ethers.