Hydroxypropyl methylcelluloseHe mea hanga noa iho tēnei hei cellulose ether, kāore e kino ki te tinana tangata. Heoi, ko ngā rauemi mata o ngā miro miro me te HPMC e whakamahia ana i te wheketere he mea hanga ki te mata, nā te mea ka puta he pānga puehu, ā, ko ētahi atu kāore e kino.
Kāore he paitini o te Hydroxypropyl methylcellulose. E kiia ana he pai te cellulose, ā, ka tukatukahia mā te whakamahi i ngā muka tūturu mā te hanumi kawakore, te tauhohenga whakapiri, te horoi, te whakamaroke, te huri me ētahi atu tukanga. Kāore e whakararu i te hauora o te tangata.
Ko te Hydroxypropyl methyl cellulose, e mōhiotia ana ko te hypromellose me te cellulose hydroxypropyl methyl ether, ka hangaia mā te whakamahi i te cellulose miro tino parakore hei rauemi mata, ā, ka whai i te etherification motuhake i raro i ngā āhuatanga kawakore.
Te hanga o te hydroxypropyl methylcellulose: ka rongoatia te cellulose miro kua whakapaia ki te lye i te 35-40℃ mō te hawhe haora, ka pēhia, ka kuruhia te cellulose, ā, ka mahia te pakeketanga i te 35℃ kia ōrite te polymerization o te muka alkali. I roto i te awhe e hiahiatia ana. Tāpirihia te muka alkali ki roto i te kettle etherification, tāpirihia te propylene oxide me te methyl chloride i roto i te raupapa, ka etherify i te 50-80℃ mō te 5h, ā, ko te pēhanga o runga he tata ki te 1.8MPa. Kātahi ka tāpirihia te nui e tika ana o te waikawa hydrochloric me te waikawa oxalic hei horoi i ngā rauemi ki te wai wera i te 90°C hei whakanui ake i te rahi me te rōrahi. Whakamarokehia mā te centrifugation. Horoi kia kore e pā. Ina iti iho i te 60% te nui o te wai i roto i te rauemi, whakamarokehia ki te hau wera i te 130°C kia iti iho i te 5% te nui.
Ko te HPMC i hangaia mā te tikanga whakarewa e whakamahi ana i te toluene me te isopropanol hei whakarewa. Mēnā ka horoia kinotia, ka paku kakara toenga. He raruraru tēnei o te tukanga horoi, kāore e pā ki te whakamahinga, ki tētahi raruraru rānei.
He miro kua whakapaia te hypromellose, kāore i te tino whakaranua ki te wai hei hanga i te cellulose kawakore, kātahi ka uru ki roto i ngā whakarewa, ngā kaihoko etherification, te toluene me te isopropanol mō ngā tauhohenga etherification, ā, ka whakakorengia, ka horoia, ka whakamarokehia, ka kuruhia kia puta ai he hua kua oti. He tino kino, he haunga hoki, nō reira ka taea e ngā kaiwhakamahi te whakamahi i roto i te āhua pumau.
Me aro te Hydroxypropyl methylcellulose ki ngā mea e whai ake nei i roto i te tono:
I roto i te pānga o te paura paru, he pānga tautoko anake te hydroxypropyl methylcellulose, ā, kāore e uru ki tētahi tauhohenga matū. Ka tāpirihia te paura paru ki te wai ka whakatakotoria ki te pakitara, he tauhohenga matū tēnei. Nā te hanganga o ngā mea hou, ka tangohia te paura paru i runga i te pakitara mai i te pakitara ka hurihia hei paura hei hanga mea hou. Ka pupuri noa te hydroxypropyl methylcellulose i te wai, ā, ka āwhina i te konupūmā hina kia pai ake te tauhohenga, engari kāore e uru ki tētahi tauhohenga.
Kāore te Hydroxypropyl Methyl Cellulose HPMC e whai wāhi ki tētahi tauhohenga matū, engari he āwhina noa iho. Tāpirihia he wai ki te paura paru ka whakatakotoria ki te pakitara, he tauhohenga matū tēnei. Nā te hanganga o ngā mea hou, ka tangohia te paura paru i runga i te pakitara mai i te pakitara ka hurihia hei paura, kātahi ka kore e taea, nā te mea kua hangaia he mea hou NS. Ko ngā wāhanga matua o te paura konupūmā hina ko: Ca(OH)2, he ranunga o te CaO me te iti o te CaCO3, CaO
H2O=Ca（OH）2-Ca（OH）2 CO2=CaCO3↓ H2O
Ka whakaputahia e te konupūmā hina ētahi atu mea i raro i te mana o te wai me te CO2 i te rangi, ko te HPMC ia ka pupuri i te wai anake, ā, ka āwhina i te konupūmā hina kia pai ake te urupare. Kāore e whai wāhi ki tētahi urupare.
He whānuitia ngā whakamahinga o te Hydroxypropyl methylcellulose. I roto i te oranga o ia rā, he maha ngā hua e kore e taea te wehe atu i te tukanga hanga. Kātahi, i roto i ngā ahumahi rerekē, he aha te pānga o te hydroxypropyl methylcellulose, māku e whakamārama atu ki a koe, kia taea ai e koe te ārai i te whakamahinga hē me te whiwhi mātauranga anō hoki.
Tuatahi, i roto i te umanga hanga, ka taea te kī he mea whakaroa, he mea pupuri wai hoki. Ka taea te papu i te moata, nō reira he wāhi anō hoki tō ngā moata maroke katoa e whakamahia ana e tātou. Hei tāpiri, i roto i ngā rauemi hanga pēnei i te gypsum mata, te paraikete, me te paura paru, ka taea te whakamahi hei here, e kore e whakaroa noa i te wā mahi, engari ka māmā ake hoki te paninga o te peita. I roto i te māpere, i ngā taera uku piri, i ngā whakapaipai kirihou matū ngota, ka taea te whakamahi hei whakarei ake i te piri, me ētahi atu. Ka taea te kī ko te hydroxypropyl methyl cellulose te mea rongonui mō tōna whakamahinga maha i roto i ngā rauemi hanga.
I roto i ētahi atu ahumahi, pērā i te hanga porcelain me te hanga uku, ka taea te whakamahi hei piripiri mō te hanga porcelain me ngā hua uku; i roto i te ahumahi lakeri me te tā waituhi, ka taea te whakamahi hei paura wetewete, hei whakamātotoru, hei whakaū, ā, nā te mea ka taea te whakakotahi ki te whakarewa waro, ki te ranunga wai rānei, ā, ka taea te whakamahi hei tango peita i roto i te hanga kirihou matū ngota, tae atu ki ngā whakangawari, ngā kaihoko tuku pokepokea ai, ngā hinu whakahinuhinu, me ētahi atu; i roto i te hanga polyvinyl chloride, e kiia ana he paura wetewete.
He whānuitia te whakamahinga o ngā hua i hangaia mai i te hydroxypropyl methylcellulose i roto i te hou o ngā hua me ngā huawhenua, te rongoā, ngā hiako kararehe me ngā ahumahi kakahu. He haumaru, kāore hoki he paitini, kāore e tino whakapataritari i ngā kiriuhi me ngā kiriuhi o te tinana tangata, ā, ka taea hoki te whakamahi hei tāpiri kai. Heoi, i roto i te āhuatanga tūturu o te mea, ka taea e tōna puehu te whakapoke i te hau, ā, kāore e pai ki te tiaki i te kiri te wehe atu i te ahi kia kore ai e pahū.
te pupuri wai
Mā te hydroxypropyl methylcellulose motuhake mō te hanga ka karohia te whakamahinga nui o te wai e te papa, ā, me pupuri te wai i roto i te paraikete i te wā e tino māro ana te gypsum. Ka kiia tēnei āhuatanga motuhake ko te pupuri wai, ā, he rite tonu ki te matotoru o te wairewa hydroxypropyl methylcellulose e whakamahia ana mō te hanga i roto i te paraikete. Ko te teitei ake o te matotoru o te wairewa, ko te teitei ake o te wheako pupuri wai.
Ārai-heke
Ka taea te pani i te moata, he āhuatanga motuhake tōna hei ārai i te totohu, me te paninga matotoru ake, engari kāore e totohu, ko te tikanga hoki kāore te moata tonu e rerekē tōna ira tangata, ki te kore ka paheke ki raro ina tīmata te hanganga.
Whakaitihia te matotoru, ā, whakahaeretia te hanganga
I muri i te tāpiri i ngā hua hydroxypropyl methylcellulose motuhake mō te hanganga, ka taea te whakaputa i te paraikete gypsum matomato he āhua matotoru. Ina kitea he tika, ā, ka whakamahia he hydroxypropyl methylcellulose motuhake mō te hanganga, ka iti ake te matotoru, ā, ka māmā ake te hanganga. Heoi, he ngoikore te pupuri wai o te hydroxypropyl methylcellulose mō te hanganga iti te matotoru, ā, me whakanui ake te nui o te tāpiri.
Te tere hototahi kirihou
Mō te nui o te moata maroke kua whakaritea, he pai ake te hanga i tētahi moata mākū nui ake, ka taea tēnei mā te tāpiri i tētahi wai iti me ngā mirumiru. Heoi, ki te roa rawa te nui o te wai me ngā mirumiru, ka ngoikore te kaha.
Wā tuku: Paenga-whāwhā-26-2024