Hydroxyethyl Cellulose (HEC) est momenti nonionic aqua-solutum polymer pertinent ad cellulosa aut genus compositorum. Est adeptus est inherere reactionem naturalis Cellulose cum ethylene cadmiae (ethylene cadmiae) sub alkaline conditionibus. Hydroxyethyl cellulosose est linearibus polysaccharide catenam composito ex GLYCOSA turmas of Cellulose in eget structuram, et omnes vel omnes hydroxyethyl coetus ad formare hydroxyethyl cellulosa.
Ingredientia et eget structure
Molecular structuram de hydroxyethyl Cellulose maxime includit in his partes:
Cellulose Backbone: Cellulose est naturalis Polysaccharide, principalis pars quae linearem torquem GLYCOSA Unitates connected by β-1,4 Glycosidic vincula. Hoc structuram cellulis dat altum crystallinarum et corporis robore.
Hydroxyethyl substituent, in GLYCOSA unitas de Cellulose backbone, sunt tres hydroxyl coetus (-oh), in C2, C3 et C6 positions respectively. Hydroxyethyl Cellulose est produci per introducendis hydroxyethyl (-ch2ch2oh) coetus in hydroxyl coetus per etherification reactionem inter haec hydroxyl coetus et ethylene cadmiae. Introductio horum substituents reduces crystallinatum Cellulose, amplio aqua solubility, et facit exhibent bonum crasso et vlocele in aqueum solutio.
Molecular pondus et gradum substitutionis: et Molecular pondus et gradum substitutionis (id est numerus hydroxyl groups substituit in se GLYCOSA unitas) de hydroxyethyl cellulosis sunt duo momenti afficiens proprietatibus. Plerumque, hydroxyethyl Cellulose cum altiorem mocecular pondus habet melius viscositas et incrassatus facultatem, cum altius gradus substitutione aquam aquam solubility et stabilitatem.
Physicochemical of Hydroxyethyl Cellulose
Ob suam unique structuram, hydroxyethyl cellulosis exhibet seriem de excellens physicochochemical proprietatibus:
Aqua Solubility: hydroxyethyl Cellulose facile solutum in frigore et calida aqua ad formare manifestum vel leviter turbidus colloidal solutio. Eius dissolution processus non significantly affectus PH valorem et manet firmum super lata ph dolor (plerumque inter II et XII).
Crassis: hydroxyethyl Cellulose habet bonum crasso effectus in aqueum solution, et crasso facultatem affectus per m. pondus, gradum substitutionis et solution concentration. Sicut concentratio crescit, in viscositas solutionis augetur exponentially, ita late in industriae agris qui requirere thessionum.
Superficiem Activity: Cum Hydroxyethyl Cellulose Molecule continet hydrophilic coetibus et hydrophobic sceleta, potest reducere superficiem tensio aqua in solution et ostenderet quaedam superficiem. Haec res facit eam in coatings, inks et aliis agris, et can amplio floris et coating proprietatibus ex uber.
Stabilitatem: hydroxyethyl Cellulose habet bona stabilitatem in aqueum solution, potest resistere influentiam generalis oxidants et lucem, et relative firmum sub acidum et alkaline conditionibus. Non erit degradatus maxime microorganisms in aqueum solution, ita non facile est deteriorare durante repono.
Biocompatibility et salus: hydroxyethyl cellulosis late in cibis, stibio et medicina, quia ex natura cellulosose et tamen bonam biocompatibility et humilis toxicity post eget modificatio. Exempli gratia, quod adhibetur ut a Thickener et stabililior in cibo, ut a Humectan et emulsifier stabilitor est in stibio, et in ligans et imperium release vulvam pro tabulis in pharmaceutical apparatu.
Praeparatio et application
Praeparatio hydroxyethyl Cellulose solet dividitur in tres gradus: alkalization de Cellulose, etherification reactionem, purificatio et siccatio. Primo, cellulosa agitur sub alkaline condiciones ad eu in hydroxyl coetibus cellulosose, et deinde portavit cum ethylene cadmiae ad producendum hydroxyethyl Cellulose. Denique ultima uber est adeptus per gradus ut neutralization, purificatio et siccatio.
Hydroxyethyl Cellulose est late in aedificationem materials (ut caementa cæmento et coatings), cotidie chemicals (ut detergents et stabilibus) et stabilizers).
Hydroxyethyl Cellulose est late in variis agri ex eius optimum physica et eget proprietatibus et versatility. In unique est eius structuram et compositionem dat eam ludere an maximus munus in crasso, emulsification, suspensione, film formationis et stabilization, et est innumerabilis momenti eget materia.
Post tempus: Feb, 17-2025