Ko te Hydroxypropyl methylcellulose he polymer wairewa rongonui e hanga ana i te otinga maamaa me te pumau i roto i te wai, ka whakamahia nuitia i roto i nga umanga rongoa, kai me te hanga. He rauemi mata kore-katote e hangai ana i te cellulose e whakapai ake ana i te hononga me te whakakotahitanga o te hua whakamutunga. Hei whakarite i te mahi kounga teitei o te hydroxypropyl methylcellulose, me whakamatau te hua me te whai tohu i mua i te whakamahi. I roto i tenei tuhinga, ka korerohia e matou nga huarahi pono e toru hei whakaatu i te kounga o te hydroxypropyl methylcellulose.
1. Whakamātautau viscosity
Ko te pokey o te hydroxypropyl methylcellulose he tawhā nui hei whakatau i tona kounga. Ko te Viscosity te parenga o te wai ki te rere, ka ine ki te centipoise (cps) me te mPa.s. Ko te pokey o te hydroxypropyl methylcellulose he rereke i runga i tona taumaha ngota me te tohu whakakapinga. Ko te teitei o te tohu whakakapinga, ko te iti iho o te pokey o te hua.
Hei whakamatautau i te pokey o te hydroxypropyl methylcellulose, memeha i te iti o te hua ki roto i te wai ka whakamahi i te viscometer hei ine i te pokey o te otinga. Ko te pokey o te otinga me uru ki roto i te awhe kua tohua e te kaiwhakarato hua. Ko te hua hydroxypropyl methylcellulose te kounga pai kia rite te pokey, he tohu mo te ma me te rahi matūriki rite.
2. Whakamātautau whakakapi
Ko te tohu o te whakakapinga e pa ana ki te tauwehenga o te maha o nga roopu hydroxyl i runga i te cellulose kua whakakapihia e te hydroxypropyl me nga roopu methyl. Ko te tohu o te whakakapinga he tohu mo te maatanga o te hua, ko te teitei o te tohu whakakapinga, ko te parakore o te hua. Ko nga hua hydroxypropyl methylcellulose kounga teitei me whai tohu whakakapinga teitei.
Hei whakamatautau i te tohu whakakapinga, ka mahia he titration ki te konutai waikawa me te waikawa maaota. Whakatauhia te nui o te konutai waikawa hei whakakore i te hydroxypropyl methylcellulose me te tatau i te tohu whakakapinga ma te whakamahi i te tauira e whai ake nei:
Te Waeke Whakakapi = ([Rirahi o NaOH] x [Molarity o NaOH] x 162) / ([Tauna o Hydroxypropyl Methyl Cellulose] x 3)
Ko te tohu o te whakakapinga me uru ki roto i te awhe kua tohua e te kaiwhakarato hua. Ko te tohu whakakapinga o nga hua hydroxypropyl methylcellulose kounga teitei me uru ki roto i te awhe kua tohua.
3. Whakamātautau wairewa
Ko te whakarewatanga o te hydroxypropyl methylcellulose tetahi tawhā matua e whakatau ana i tona kounga. Ko te hua me ngawari ki te wairewa i roto i te wai, kia kaua e hanga he kapia, he reera ranei. Ko nga hua hydroxypropyl methylcellulose kounga teitei kia tere, kia rite.
Ki te mahi i tetahi whakamatautau whakamaarama, memeha i te iti o te hua ki roto i te wai ka whakaohokia te otinga kia rewa katoa. Ko te otinga kia maamaa, kia kore he kapia, he reera ranei. Mena karekau te hua e memeha, ka hanga kapia ranei, he raera ranei, he tohu he kino te kounga.
Hei whakamutunga, ko te hydroxypropyl methylcellulose he rauemi mata nui e whakamahia ana i roto i nga momo ahumahi. Hei whakapumau i te kounga teitei o te hua, ka mahia nga whakamatautau, te whakakapinga me te whakarewatanga. Ko enei whakamatautau ka awhina i te maarama ki nga ahuatanga o te hua me te awhina ki te wehe i tona kounga. Ko te hydroxypropyl methylcellulose te kounga teitei he rite tonu te pokey, he nui te whakakapinga, he tere, he rite tonu te rewa i roto i te wai.
Wā tuku: Hūrae-11-2023