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 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 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 me maama me te 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