Sodium Carboxymethyl Cellulose Viscosity

Iyo viscosity ye sodium carboxymethyl cellulose yakakamurwawo kuita mamakisi mazhinji zvinoenderana nekushandiswa kwakasiyana. Iyo viscosity yemhando yekuwachisa ndeye 10 ~ 70 (pasi pe100), iyo yekumusoro muganho we viscosity inobva ku200 ~ 1200 yekushongedza kwekuvaka uye mamwe maindasitiri, uye viscosity yegiredhi rekudya yakatokwira. Iwo ose ari pamusoro pe1000, uye viscosity yemaindasitiri akasiyana-siyana haina kufanana.

Nokuda kwehuwandu hwekushandiswa kwayo.
Iyo viscosity ye sodium carboxymethyl cellulose inobatwa nehuremu hwayo hwema molecular mass, concentration, tembiricha uye pH kukosha, uye inosanganiswa ne ethyl kana carboxypropyl cellulose, gelatin, xanthan gum, carrageenan, mhashu bhinzi gum, guar gum, agar, sodium alginate, pectin, gum arabic uye starch uye zvinobva pairi zvine kuenderana kwakanaka (kureva synergistic mhedzisiro).

Kana iyo pH kukosha iri 7, viscosity ye sodium carboxymethyl cellulose mhinduro ndiyo yepamusoro, uye kana iyo pH kukosha iri 4 ~ 11, inenge yakagadzikana. Carboxymethylcellulose muchimiro chealkali simbi uye ammonium munyu inonyungudika mumvura. Divalent metal ions Ca2+, Mg2+, Fe2+ inogona kukanganisa viscosity yayo. Sirivha inorema, barium, chromium kana Fe3+ inogona kuita kuti ibude mumhinduro. Kana huwandu hweion huchidzorwa, sekuwedzerwa kwechelating agent citric acid, mhinduro yakawanda inogona kuumbwa, zvichiita kuti gum yakapfava kana yakaoma.

Sodium carboxymethyl cellulose imhando yechisikigo cellulose, iyo inowanzo gadzirwa nedonje linter kana huni pulp semidziyo yakabikwa uye inoiswa etherification reaction ine monochloroacetic acid pasi pemamiriro ealkaline.

Zvinoenderana nezvinotsanangurwa zvezvakagadzirwa uye kutsiva iyo hydroxyl hydrogen mu cellulose D-glucose unit neboka recarboxymethyl, mvura-inonyungudika polymer makomisheni ane madhigirii akasiyana ekutsiva uye akasiyana mamolecular uremu kugoverwa anowanikwa.

Nekuti sodium carboxymethyl cellulose ine akawanda akasiyana uye akanakisa hunhu, inoshandiswa zvakanyanya muindasitiri yemakemikari yemazuva ese, chikafu nemishonga uye kumwe kugadzirwa kwemaindasitiri.

Chimwe chezviratidzo zvakakosha zve sodium carboxymethyl cellulose ndeye viscosity ye sodium carboxymethyl cellulose. Kukosha kwe viscosity kwakabatana nezvinhu zvakasiyana-siyana zvakadai sekutarisa, tembiricha uye shear rate. Nekudaro, zvinhu zvakaita sekutarisa, tembiricha uye shear rate ndizvo zvekunze zvinokanganisa viscosity ye sodium carboxymethyl cellulose.

Huremu hwayo hwemamorekuru uye kugovera kwema molecular zvinhu zvemukati zvinokanganisa viscosity ye sodium carboxymethyl cellulose mhinduro. Kune dhizaini yekugadzira uye kugadzirwa kwechigadzirwa kusimudzira kwesodium carboxymethyl cellulose, kutsvagisa huremu hwayo hwemamorekuru uye kugovera huremu hwemamorekuru kwakakosha zvakanyanya kukosha, nepo viscosity Chiyero chinogona kungotamba rimwe basa rereferenzi.

Mitemo yaNewton mune rheology, ndapota verenga zvinoenderana ne "rheology" mumakemikari emuviri, zvakaoma kutsanangura mumutsara mumwe kana maviri. Kana iwe uchifanira kuzvitaura: kune dilute solution yecmc padyo neNewtonian fluid, shear stress inoenzana nekucheka kumucheto mwero, uye iyo proportional coefficient pakati pavo inonzi viscosity coefficient kana kinematic viscosity.

Viscosity inotorwa kubva kumasimba ari pakati pe cellulose molecular cheni, kusanganisira kupararira masimba uye hydrogen bond. Kunyanya, iyo polymerization ye cellulose derivatives haisi mutsara chimiro asi yakawanda-mapazi chimiro. Mune mhinduro, akawanda-matavi akawanda cellulose anopindirana kuti aite spatial network chimiro. Iyo yakaomesesa chimiro, hukuru hukuru pakati pemaketani emamorekuru mune inoguma mhinduro.

Kugadzira kuyerera mune yakanyungudutswa mhinduro yezvinobva muselulosi, simba riri pakati pemacheni remamorekuru rinofanira kukundwa, saka mhinduro ine dhigirii repamusoro repolymerization inoda simba rakakura kugadzira kuyerera. Kuyera viscosity, simba riri paCMC mhinduro igiravhiti. Pasi pemamiriro ekugara kwegiravhiti, iyo cheni chimiro cheCMC mhinduro ine huwandu hukuru hwepolymerization ine simba rakakura, uye kuyerera kunononoka. Kuyerera kunononoka kunoratidza viscosity.

Iyo viscosity ye sodium carboxymethyl cellulose inonyanya kuenderana nehuremu hwemamorekuru, uye haina chekuita nehuwandu hwekutsiva. Iyo yakakura dhigirii yekutsiva, iyo yakakura huremu hwemamorekuru, nekuti huremu hwemamorekuru eiyo inotsiviwa carboxymethyl boka rakakura kupfuura rekare hydroxyl boka.

Munyu wesodium we cellulose carboxymethyl ether, annionic cellulose ether, ichena kana mukaka chena fibrous powder kana granule, ine density ye 0.5-0.7 g/cm3, inenge isinganhuhwi, isinganakidze, uye hygroscopic. Zviri nyore kupararira mumvura kuumba yakajeka colloidal mhinduro, uye isinganyunguriki muorganic solvents senge ethanol. Iyo pH ye1% aqueous solution ndeye 6.5 kusvika 8.5. Kana pH> 10 kana <5, viscosity ye sodium carboxymethylcellulose yakaderedzwa zvakanyanya, uye kuita kwacho ndiko kwakanakisa kana pH = 7.

Yakatsiga pakupisa. Iyo viscosity inokwira nekukurumidza pasi pe20 ℃, uye inoshanduka zvishoma nezvishoma pa45 ℃. Kupisa kwenguva refu pamusoro pe80 ℃ kunogona kuita denature iyo colloid uye kuderedza viscosity uye kuita zvakanyanya. Inonyungudika nyore nyore mumvura, uye mhinduro yacho iri pachena; yakanyatsogadzikana mune alkaline solution, uye zviri nyore kuita hydrolyze pamberi peasidhi. Kana iyo pH kukosha iri 2-3, inonaya.