Hydroxypropyl methyl Cellulose HPMC est quaedam non-Ionic Cellulose mixto Ather, quae differt a Ionica methyl carboxymethyl celluloste mixto aether et non agere cum gravibus metalla. Ob diversas proportiones de metxyl contentus et hydroxypropyl contentus in hydroxypropyl Methylcellulosis et diversis viscosities, id est facti varietate varietates cum diversis proprietatibus, quia est in varietate, et in altum et humilis HydroxyProp ut qui hydroxypropyl methylcellulosis. Tamen, in varietates varietates, quamvis tantum parva moles hydroxypropyl coetus vel parva moles Mthoxy coetus continetur, solubility in organicum solvents vel Floroculation temperatus in Aqueous solution sunt valde diversis.
I. Quod solubility hydroxypropyl
①solubility of hydroxypropyl Methyl Cellulose in aqua hydroxypropyl methyl cellulosis est actu a ylellulose mutatio per propylene cadmiae (methyl oxypropylene), ita etiam habet easdem proprietatibus quasi methyl Cellulose. Cellulose similis frigida solubiliter calida aqua insolubilitas. Tamen, debitum ad mutatio hydroxypropyl coetus, eius gelatio temperatus in calida aqua multo altior quam de methyl Cellulose. Eg Viscositas Aqueum solutio hydroxypropyl 0.73 et II% Metxyl content DS = 0.73 et hydroxypropyl contentus MS = 0.46 est D MPa? S ad XX °. Et gel temperatus potest pervenire ad C ° C, dum Methylcellulose ad idem temperatus est solum de LV ° c. Sicut in solubility in aquam, quod etiam valde amplio. Exempli gratia, in triticum hydroxypropyl methylcellulose (0.2 0.5mm in figura 0.5mm ad XX ° C ° C et Viscosity SOLUTIO SOLUTIO SOLUTIO ad 2PA? S potest esse in ad locus temperatus, facile solutum in aquam sine refrigerium.
Methyl cellulosis in Organic solubility in ②the Hydroxypropyl Methyl solubility of Hydroxypropyl Methyl Cellulose in organicum solvents est etiam melius quam de methyl cellulosis, et methyl in products super 2.1 et summus viscosity hydroxypropyl MS = 1.5 ~ 1.8 et Mthoxy DS = 0.2 ~ 1.0, et totalis substitutione gradu supra 1.8 sunt solutum in anhydrous methanolum ethanol solutions medium, thermoplastic et aqua-solutum. Est etiam solutum in chlorinated hydrocarbonum ut dichloromethane et chloroform et organicum solvents ut acetone, isopropanol et diacetone ipsum. Et solubility in organicum solvents melius quam aqua, solutum.
II. Factores afficiens Viscositas Hydroxypropyl Methylcellulose
Influencing factores of Hydroxypropyl METHYL cellulosity viscositas vexillum Viscositas determinatio Hydroxypropyl Methyl Cellulose, sicut alia Cellulose aether, fundatur in II% aqueum solutio ad XX ° c. Viscositas eiusdem productum augetur augmentum concentration. Nam products cum diversis mocecular weights ad idem concentration, products cum maior molecular pondera habent altiorem viscositas. Et necessitudinem cum temperatus est similis, quod de Methyl Cellulose. Cum temperatus crescit, in viscositas incipit diminuere, sed cum ad quandam temperamentum, viscositas subito augetur et gelaing occurrit. Gel temperatus humilis-viscosity products est altior. Est princeps. Eius Gel punctum non solum ad viscositatem aethere, sed etiam ad compositionem ratio Mthoxy et hydroxypropyl in aether et totalis gradus substitutionis. Notandum est quod hydroxypropyl Methylcellos est etiam Pseudoplastic et solution est stabilis locus temperatus sine ulla degradation of viscosity nisi possibilitas enzymatic degradation.
III. Hydroxypropyl methylcellose acid et alkali resistentia
Hydroxypropyl methylcellose acid et alkali resistentia hydroxypropyl methylcellulose est plerumque firmum ad acid et alkali, et non affectus in range of pH II ~ XII. Potest resistere quaedam moles lux acidum. Ut formicas acidum, acetic acidum, citric acidum, succinic acidum, phosphoric acidum, boreric acidum, etc. Sed concentratate acidum habet effectum reducendo Viscosity. Alkali ut caustic nitri, caustic potash et calce aquam non effectum in ea, sed potest leviter auget viscositas solutionum, et erit in futurum.
IV. Mixability de hydroxypropyl
Medicility hydroxypropyl methyl cellulosose hydroxypropyl methyl cellulosis solutio potest esse mixta cum aqua-solutum polymer compositis ad facti uniformis et transparent solutio in altioribus viscositas. Haec polyethylene glycol componit polymer, polyvinyl acetate, polyysiloxane, polymethyl vinyl siloxane, hydroxyethyl Cellulose et Methyl Cellulose. Naturalis Polymer componit ut Gum Arabica, lucust faba gummi, Karaya gum, etc. Item habent bonum mixability cum suis solution. Hydroxypropyl methylcellose potest etiam mixta cum Mannitol aut sorbitol esters in Stearica acid aut palmitic acidum, et quoque misceri cum glycerin, sorbitol et mannitol. Hi componit potest esse ut hydroxypropyl methylcellulosis. Cellulose-fundatur plasticizer.
V. Insolubilitatem et Aqua Solubility of Hydroxypropyl Methylcellulose
In insolubilized aqua-solutum cellulosose aether hydroxypropyl methylcellose potest superficies-crosslinked cum aldehydes, et haec aqua-solutum aethere praecipitari in solutione et facti insolubilis in aquis. Et aldehydes, quod faciunt hydroxypropyl methylcellose insoluble includit formaldehyde, glyoxal, succincinaldehyde, adipaldehyde, etc. cum usura formaldehyde, specialem operam debet esse solvit ad PH valorem de solutione, in quibus glyoxal reacts citius. Ideo gyoxal communiter usus est sicut crosslinking agente in industriae productio. Dosis huius generis crosslinking agente in solutione est 0.2% ~ X% of aethere massa, potissimum VII% X%, et 3.3% ~ VI% est maxime idoneam Gyoxal. General Treatment temperatus est 0 ~ XXX ℃ et tempus est I ~ 120min. Cross-vinculum reactionem indiget ferri sub acidic conditionibus. Plerumque, inorganicis acidum aut organicum carboxylic acid additur ad solutionem ad adjust in PH de solutione ad de II ~ VI, potius inter IV ~ VI, et aldehydes sunt addita ad portare de crucem-vertente reactionem. . The acids used include hydrochloric acid, sulfuric acid, phosphoric acid, formic acid, acetic acid, hydroxyacetic acid, succinic acid or citric acid, among which formic acid or acetic acid is suitable, and formic acid is the most optimal. Acidum et aldehyde potest etiam adiunxi eodem tempore ut solutionem ad crosslink in desideravit Phant. Hoc reactionem est saepe usus est in ultima curatio processus in praeparatione processus of Cellulose aether. Post cellulosa aether est insolubilized, id est convenient ad lavabit et purificare aqua ad XX ~ XXV ° c. Cum autem uber est in usu, an alkaline substantia potest addidit ad solutionem productum ad adjust in PH de solutione esse alkaline, et uber et dissolvere in solut. Hoc modum est etiam applicabilis ad cellulosose aether solution factum in a film et in film est processionaliter ad eam insolubilis amet.
VI. Hydroxypropyl Methylcellosus est repugnans ad enzymes
Hydroxypropyl methylcellosus repugnant ad enzymes. In theory, cellulose derivatives, such as each anhydroglucose group, have a firmly bonded substituent group, which is not easy to be infected by microorganisms, but in fact the finished product When the substitution value exceeds 1, it will also be degraded by enzymes, which means that the degree of substitution of each group on the cellulose chain is not uniform enough, and microorganisms can erode near Unsubstitutus Anhydroglucose coetus ad formare sugars. , Quod absorbetur ut nutrimentum in microorganisms. Ergo si Efferification substitutio gradus Cellulose augetur, resistentia ad enzmaticum exesa cellulosa aether sit etiam auctus. Est relatum quod RELICTUM Viscosity Hydroxypropyl Methylcellosus (1.9 =) is 13.2%, Methylcellulose (DS = 1.83) est 7.3% et Methylcellosus (1.66 est, et Hydroxyethyl) is 3.8%. Potest esse anti-enzyme facultatem hydroxypropyl Methylcellulose est fortis. Ideo optimum enzyme resistentia hydroxypropyl methylcellosa, cum suis bonis dispersibility, crasso et film-formatas proprietatibus, quod plerumque in aqua-emulsion coatings, et plerumque non requirit additionem conservatives. Tamen, pro diu-term repono de solutione vel fieri potest contaminationem extra mundum, conservativa potest addidit ut cautela, et arbitrium potest determinari secundum ultima requisita solution. Phenylmercuric acetate et manganese fluorosilicare sunt efficaciora conservativa, sed non tam toxicity, operam esse solvit ad operationem, et dosis est plerumque I ~ 5mg de phenylmercuric acetate per sextarium.
VII. Proprietatibus hydroxypropyl Methylcellulosis amet
In perficientur of hydroxypropyl Methylcellulose film hydroxypropyl Methylcellulose habet optimum film-formatam proprietatibus, et aqueum solutio seu organicum solvendo solution est iactaret in speculo laminam, et fit hyalinae et transparent post siccatio. Et lenta film. Hoc est bonum humorem resistentia et manet solidum ad altum temperaturis. Exempli gratia, addendo hygroscopic plasticizer potest augendae eius elongatio et flexibilitate. Ut amplio flexibilitate, plasticizers ut glycerin et sorbitol sunt aptissima. De generali solution concentration est II% ~ III%, et moles plasticizer est X% ~ XX% of Cellulose aether. Si contentus de plasticizer est excelsum et DECREMENTUM PHATomenon de Colloid siccitatibus siccitatibus erit sub alto humiditas. Tenensium vires in amet cum plasticizer addidit multo maior quam sine plasticizer et auget augmentum additae quantum. Ut ad hygroscopicity de film, illud etiam crescit cum incremento plasticizer moles.
Post tempus: Feb, 20-2025