Hoʻomākaukau a me nā waiwai kino o ka hydroxypropyl starch ether

Hoʻomākaukau ʻia ka hydroxypropyl starch ether (HPStE) ma o ke kaʻina hana hoʻololi kemika e pili ana i ka hoʻokomo ʻana i nā pūʻulu hydroxypropyl ma luna o ka mole mole. ʻO ke ʻano o ka hoʻomākaukau ʻana e pili ana i kēia mau ʻanuʻu:

1. Koho Mākaʻikaʻi: Koho ʻia ka mākiko kiʻekiʻe, i loaʻa maʻamau mai nā kumu e like me ke kulina, ka palaoa, ka ʻuala, a i ʻole ka tapioka, i mea hoʻomaka. ʻO ke koho ʻana i ke kumu mākū e pili ana i nā waiwai o ka huahana HPStE hope loa.
2. Ka hoʻomākaukau ʻana i ka starch Paste: Hoʻopuehu ʻia ka starch i koho ʻia i loko o ka wai e hana i kahi paʻi starch. Hoʻomaʻamaʻa ʻia ka pāpaʻi i kahi mahana kikoʻī e gelatinize i nā granules starch, e ʻae ai i ka reactivity maikaʻi a me ke komo ʻana o nā reagents i nā ʻanuʻu hoʻololi aʻe.
3. Etherification Reaction: Hoʻopili ʻia ka pāpaʻi starch gelatinized me ka propylene oxide (PO) i mua o kahi catalyst ma lalo o nā kūlana hoʻomalu. Hoʻopili ka propylene oxide me nā pūʻulu hydroxyl (-OH) ma ka mole starch, e hopena i ka hoʻopili ʻana o nā pūʻulu hydroxypropyl (-OCH2CH(OH)CH3) i ka iwi kuamoʻo starch.
4. Neutralization a me ka hoʻomaʻemaʻe: Ma hope o ka hopena etherification, hoʻokaʻawale ʻia ka hui ʻana no ka wehe ʻana i nā reagents a i ʻole catalysts. Hoʻomaʻemaʻe ʻia ka hydroxypropyl starch ether ma o nā kaʻina hana e like me ka kānana, ka holoi ʻana, a me ka hoʻomaloʻo ʻana e wehe i nā haumia a me nā koena kemika.
5. Hoʻololi i ka nui o ka ʻāpana: Hiki ke hoʻololi ʻia nā waiwai kino o HPStE, e like me ka nui o ka ʻāpana a me ka puʻunaue ʻana, ma o ka wili ʻana a i ʻole nā ​​kaʻina wili e hoʻokō i nā ʻano i makemake ʻia no nā noi kikoʻī.

Hiki ke ʻokoʻa nā waiwai kino o ka hydroxypropyl starch ether ma muli o nā kumu e like me ke degere o ka hoʻololi ʻana (DS), ke kaumaha molekala, ka nui o ka ʻāpana, a me nā kūlana hana. ʻO kekahi mau waiwai kino maʻamau o HPStE penei:

1. ʻAno: ʻO ka HPStE ka pauka keʻokeʻo a keʻokeʻo keʻokeʻo me ka puʻunaue ʻana o ka nui. Hiki ke ʻano like ʻole ke ʻano morphology mai ka spherical a i ka ʻano like ʻole ma muli o ke kaʻina hana.
2. Ka nui o ka ʻāpana: Hiki ke hoʻokaʻawale ʻia ka nui o ka HPStE mai kekahi mau micrometers a i ʻumi micrometers, me ka hopena koʻikoʻi i kona dispersibility, solubility, a me ka hana ma nā noi like ʻole.
3. ʻO ka Density Nui: Hoʻopili ka nui o ka HPStE i kona kahe kahe ʻana, ka lawelawe ʻana i nā hiʻohiʻona, a me nā koi hoʻopili. Ana maʻamau ia ma nā grams no ke kenimika cubic (g/cm³) a i ʻole kilokani no ka lita (kg/L).
4. Solubility: ʻAʻole hiki ke hoʻoheheʻe ʻia ka HPStE i ka wai anuanu akā hiki ke hoʻopuehu a pehu i loko o ka wai wela, e hana ana i nā hāʻina viscous a i ʻole nā ​​gels. Hiki ke ʻokoʻa ka solubility a me ka hydration waiwai o HPStE ma muli o nā mea e like me DS, paona molekala, a me ka mahana.
5. Viscosity: Hōʻike ka HPStE i nā waiwai mānoanoa a me ka mana rheological i loko o nā ʻōnaehana wai, e hoʻohuli ana i ka viscosity, ka holo ʻana, a me ka paʻa o nā hoʻohua. ʻO ka viscosity o nā haʻina HPStE e pili ana i nā mea e like me ka neʻe ʻana, ka mahana, a me ka helu shear.
6. Ka Laki Waiwai: ʻO ka hydration rate o HPStE e pili ana i ka nui o kona komo ʻana i ka wai a pehu e hana i nā ʻoluʻolu a i ʻole nā ​​gels. He mea nui kēia waiwai i nā noi kahi e koi ʻia ai ka hydration wikiwiki a me ka mānoanoa.

ʻO ka hoʻomākaukau ʻana a me nā waiwai kino o ka hydroxypropyl starch ether e hoʻokō ʻia e hoʻokō i nā koi noi kikoʻī a me nā pae hoʻokō, e lilo ia i mea hoʻohui nui a waiwai hoʻi i nā ʻoihana like ʻole a me nā formulations.