Hydroxypropyl methylcellulose (HPMC)est a non-ionic, aqua-solutum cellulosis mixto aether. Vultus est albus ad leviter flavo pulveris aut granulares materia, insulsa, odorless, non-toxicus, chemica firmum et dissolvit in aquam ad formare lenis, transparent in aquam ad formare lenis, transparent in aqua ad formare lenis, transparent in aquam ad formare lenis, transparent in aqua ad formare lenis, transparent in aqua ad formare lenis, transparent in aqua ad formare lenis, transparent in aqua ad formare lenis, transparent et viscosa solutio. Unum ex maxime momenti proprietatibus hydroxypropyl methylcellosus in application est quod auget viscositas liquidae. In ira effectum pendeat in gradu polymerization (DP) de productum, in concentration of Cellulose aethere in aqueum solution, tondendas rate et solutio temperatus. Et aliis factores.
01
Fluidum genus HPMC Aqueum solution
In generali, in accentus de fluidi in tondere fluxus potest exprimi munus solum tondendas rate ƒ (Γ), ut dum non est tempus, dependens. Fretus forma ƒ (γ) fluidorum potest dividitur in diversas genera, nimirum: fluidorum, dilatant fluidorum, Pseudoplastic fluidorum et Bingham plastic fluidorum.
Cellulosa aethere dividitur in duo genera: unum est non-Ionic Cellulose aether et alterum est Ionic Cellulose aether. Nam Rheologia harum duorum generum cellulosose aether. SC Naik et al. Conducted a comprehensive et ratio comparative studium in hydroxyethyl Cellulose et sodium carboxymethyl Cellulose solutions. Eventus ostendit quod tam non-Ionic Cellulose aether solutions et Ionic Cellulose aether solutions fuerunt pseudoplastic. Fluit, id est non-Newtonian fluit, accedat Newtoniana liquores tantum humilis concentratione. Pseudoplasticitas hydroxypropyl methylcellulose solutio ludit an maximus munus in application. For example, when applied in coatings, due to the shear thinning characteristics of aqueous solutions, the viscosity of the solution decreases with the increase of shear rate, which is conducive to the uniform dispersion of pigment particles, and also increases the fluidity of the coating . Effectus est maxima; Dum quieti, in viscositas solutionis est secundum magnum, quod efficaciter prohibet depositionem pigmentorum particulas in coating.
02
HPMC Viscosity Test modum
An magna indicator ad metimur crasso effectus ex hydroxypropyl methylcellosus est apparent viscositas aqueum solution. Et mensurae modi apparent Viscosity plerumque includit capillarium viscositas modum, gyratorium viscositas modum et procidens pila viscositas modum.
Ubi: est apparent Viscositas, MPA s; K est viscometer constans; Density D est solution sample ad XX / XX ° C; T est tempus ad solutionem transire per superiorem partem in VEXECETER ad imo marcam, s; Tempus quod vexillum oleum influit per in Viscometer est metiri.
Tamen per modum mensuræ a capillaribus VECECEDEET est molestum. Et viscosities multisCellulose aetherSunt difficile ad analyze usura capillaribus VECECETET quia haec solutiones quae vestigium amounts of insolubilis materia, quae sunt nisi deprehenditur cum capillaribus VECEDEETE est impeditur. Ideo maxime manufacturers uti gyratoribus VECCEETERS ad control qualis est hydroxypropyl Methylcellulose. Brookfield Viseceteeters sunt communiter in externis regionibus, et NDJ VEPURGETES in Sinis.
03
Influencing factores HPMC Viscosity
3,1 necessitudinem cum gradu aggregationis
Cum alias parametri non mutata, et viscositas hydroxypropyl methylcellose solutio est proportionalis ad gradum polymeriation (DP) vel mocela pondus vel molecular torquem longitudinem et crescit augmentum gradum ad polymeriza. Hunc modum pronuntiata in humilitate polymerization quam in altum gradum polymerization.
3.2 necessitudinem inter viscositas et concentration
Viscositas hydroxypropyl methylcellulose crescit cum incremento concentration in productum in aqueum solutio. Etiam parva concentration mutatio et faciam magna mutatio in viscosity. Cum autem nominis viscositas hydroxypropyl methylcellulose effectus mutationem solution concentration in viscositas solutionis est magis et manifestum.
3.3 necessitudinem inter viscositas et tondendas rate
Hydroxypropyl methylcellulosis aqueum solutio habet proprietatem tondendas. Hydroxypropyl methylcellosa de diversis exprimit viscositas est paratus in II% aqueum solutio, et ejus viscositas ad diversis tondendas rates est metiri respectively. Eventus sunt, ut sequitur quod ostensum est in figura. In humilis tondendas rate, in viscositas hydroxypropyl methylcellosus solutio non mutare significantly. Cum incremento de tondendas rate, in viscositas hydroxypropyl methylcellosus solutio cum altioribus exprobrantis Viscositas minuatur manifesto, dum solutio humilis viscositas non decrescat manifesto.
3.4 necessitudinem inter viscositas et temperatus
Viscositas hydroxypropyl methylcellulose solutio valde affectus temperatus. Sicut temperatus augetur, in viscositas solution diminuitur. Ut ostensum est in figura, paratus est in aqueum solutio cum concentratione II%, et mutationem de viscosity cum augmentum temperatus est metiri.
3.5 alii influendo factores
Viscositas aqueum solutio hydroxypropyl methylcellosus est etiam affectus additives in solutione, PH valorem de solutione et microbial degradation. Plerumque in ordine ad consequi melius viscositas perficientur vel redigendum sumptus de usu, necesse est addere Rheologiam immutari, ut lutum, modified lutum, Polymer, ad Aqueum et Aethroxypropy Methylcellosus. Et electrolytes ut chloride, bromide, phosphate, nitrate, etc. potest addidit ad aqueum solution. Hae additives non solum afficiunt viscositas proprietatibus aqueum solution, sed etiam afficit alia applicationem proprietatibus hydroxypropylt Methylcellosus ut aqua retention. , Sag resistentia, etc.
Et viscositas Aqueum solutio hydroxypropyl methylcellosa est fere non affectus acidum et alkali, et plerumque firmum in range of III ad XI. Potest resistere quaedam moles infirmi acida, ut formicos acidum, sicut acidum phosphoric acet , Boric acidum, citric acidum, etc. Sed concentrated acidum mos redigendum viscositas. Sed caustic nitri, potassium hydroxide, calce aquam, etc. parum effectum in ea. Comparari aliis Cellulosae aetherishydroxypropyl methylcelluloseaqueous solution has good antimicrobial stability, the main reason is that hydroxypropyl methylcellulose has hydrophobic groups with high degree of substitution and steric hindrance of groups However, since the substitution reaction is usually not uniform, the unsubstituted anhydroglucose unit is most easily eroded by microorganisms, resulting In degradation of Cellulose aether moleculis et torquem scientiam. Quod perficientur est quod apparent Viscositas Aqueum solutio decrescit. Si necesse est copia ad aqueum solutio hydroxypropyl Methylcellosus pro longo tempore, commendatur addere vestigium moles antifungal agente, ut viscositas non mutare significantly. Cum eligens anti-fungal agentibus, conservativa vel fungicides, vos should attendere ad salutem et eligere products non toxicus ad humanum corpus, in stabularibus proprietatibus et in odorless, ut Dow in stabula fascibides et in odorless, ut Dow Cham scriptor Amical Fungicides, Cnngeria Perveniae et alia products. Potest ludere correspondentes partes.
Post tempus: Apr-28-2024