Kugadzirira kwe carboxymethyl cellulose

Carboxymethyl cellulose (CMC)ipolymer inonyungudika yakawanda-inonyungudika yakatorwa kubva ku cellulose, inova polysaccharide yemusikirwo inowanikwa mumadziro esero rezvirimwa. CMC inowana zvikumbiro zvakakura mumaindasitiri akasiyana siyana anosanganisira chikafu, mishonga, zvizorwa, machira, mapepa, uye zvimwe zvakawanda nekuda kwezvakasiyana zvivakwa zvakaita sekukora, kudzikamisa, kusunga, kugadzira firimu, uye kuchengetedza mvura. Kugadzirira kweCMC kunosanganisira matanho akati wandei kutanga kubva pakutorwa kweselulosi kubva kune yakasikwa masosi inoteverwa nekugadziriswa kwayo kuunza mapoka ecarboxymethyl.

1. Kubvisa Cellulose:
Nhanho yekutanga mukugadzirira kweCMC kubviswa kweselulosi kubva kune zvakasikwa senge pulp yehuni, machira ekotoni, kana mamwe mafiber echirimwa. Iyo cellulose inowanzo kuwanikwa kuburikidza neakatevedzana maitiro anosanganisira pulping, bleaching, uye kuchenesa. Semuenzaniso, pulp yehuni inogona kuwanikwa ne mechanical kana kemikari pulping process inoteverwa ne bleaching ne chlorine kana hydrogen peroxide kubvisa tsvina uye lignin.

2. Kuita kweCellulose:
Kana cellulose yabviswa, inoda kuvhurwa kuti ifambise kuunzwa kwemapoka ecarboxymethyl. Activation inowanzoitwa nekurapa cellulose nealkali senge sodium hydroxide (NaOH) kana sodium carbonate (Na2CO3) pasi pemamiriro akadzora ekushisa uye kumanikidzwa. Alkali kurapwa inozvimba iyo cellulose fiber uye inowedzera reactivity yavo nekutyora intra uye intermolecular hydrogen bond.

3. Carboxymethylation Reaction:
Iyo activated cellulose inozoiswa pasi peiyo carboxymethylation reaction apo carboxymethyl mapoka (-CH2COOH) anounzwa pamapoka ehydroxyl emaketani e cellulose. Kuita uku kunowanzoitwa nekuita iyo activated cellulose ine sodium monochloroacetate (SMCA) pamberi peiyo alkaline catalyst senge sodium hydroxide (NaOH). Mhinduro yacho inogona kumiririrwa sezvizvi:

Cellulose + Chloroacetic Acid → Carboxymethyl Cellulose + NaCl

Mamiriro ekuita anosanganisira tembiricha, nguva yekuita, kusangana kwemareagents, uye pH inodzorwa nekuchenjera kuti ive nechokwadi chegoho repamusoro uye inodiwa dhigirii rekutsiva (DS) iyo inoreva huwandu hweavhareji yemapoka ecarboxymethyl akaunzwa paglucose unit ye ​​cellulose cheni.

4. Neutralization uye Washing:
Mushure meiyo carboxymethylation reaction, iyo inokonzeresa carboxymethyl cellulose inogadziriswa kubvisa yakawandisa alkali uye isina kubatwa chloroacetic acid. Izvi zvinowanzoitika nekugeza chigadzirwa nemvura kana dilute asidhi mhinduro inoteverwa nekusefa kuparadzanisa yakasimba CMC kubva musanganiswa wekuita.

5. Kucheneswa:
Iyo CMC yakacheneswa inozogezwa nemvura kakawanda kuti ibvise tsvina yakaita semunyu, mareagents asina kubatwa, uye nezvinogadzirwa. Sefa kana centrifugation inogona kushandiswa kupatsanura CMC yakacheneswa kubva mumvura yekugeza.

6. Kuomesa:
Chekupedzisira, iyo yakacheneswa carboxymethyl cellulose yakaomeswa kubvisa hunyoro hwasara uye kuwana chigadzirwa chaunoda muchimiro chehupfu hwakaoma kana granules. Kuomesa kunogona kuitwa uchishandisa nzira dzakasiyana-siyana sekuomesa mhepo, vacuum drying, kana kupfapfaidza kuomesa zvinoenderana nezvinodiwa zvechigadzirwa chekupedzisira.

7. Hunhu uye Kudzora Hunhu:
The akaomeswaCMCchigadzirwa chinoiswa pasi peakasiyana maitiro ehunhu akadai seFourier shandura infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), uye viscosity zviyero kuratidza chimiro chayo chemakemikari, dhigirii rekutsiva, huremu hwemamorekuru, uye kuchena. Kuongororwa kwemhando yepamusoro kunoitwawo kuti ive nechokwadi chekuti chigadzirwa chinosangana nezvinodiwa zvemashandisirwo acho.

kugadzirira kwecarboxymethyl cellulose kunosanganisira matanho akati wandei anosanganisira kubviswa kwe cellulose kubva kune zvakasikwa masosi, activation, carboxymethylation reaction, neutralization, kucheneswa, kuomesa, uye hunhu. Nhanho yega yega inoda kunyatso kudzora mamiriro ekuita uye paramita kuti uwane goho repamusoro, dhigirii rinodiwa rekutsiva, uye kunaka kwechigadzirwa chekupedzisira. CMC i polymer inoshandiswa zvakanyanya ine akasiyana maapplication nekuda kweakasarudzika zvivakwa uye kuita zvakasiyana.