ʻO ka starch ethers a me ka cellulose ethers he mau ether ia e hana nui i nā ʻoihana like ʻole, ʻoi aku hoʻi i ke kūkulu ʻana a me nā mea hoʻohui i nā huahana like ʻole. ʻOiai he mau mea like ko lākou, he mau pūhui ʻokoʻa lākou me nā ʻano kemika like ʻole, nā waiwai, a me nā noi.
1. Kemimi hale:
Starch etera:
Loaʻa ka starch ethers mai ka starch, he polysaccharide i haku ʻia me nā ʻāpana glucose. ʻO ka hana kemika o ka starch he ʻelua mau mea nui: amylose (nā kaulahao laina o nā molekole glucose i hoʻopili ʻia e nā paʻa α-1,4-glycosidic) a me amylopectin (loaʻa ka α-1,4 a me ka α-1,6- Nā polimer lālā me nā paʻa glycosidic. ) pili. Loaʻa nā ethers starch ma ka hoʻololi ʻana i nā pūʻulu hydroxyl o ka starch ma o ke kaʻina hana etherification.
Cellulose ether:
ʻO ka cellulose, ma ka ʻaoʻao ʻē aʻe, he polysaccharide ʻē aʻe, akā aia kona ʻano i nā ʻāpana glucose i hoʻopili ʻia e nā paʻa β-1,4-glycosidic. Loaʻa ka cellulose ethers mai ka cellulose ma o ke kaʻina hana etherification like. Hoʻopili ʻia nā ʻāpana hana hou i loko o ka cellulose e nā paʻa beta, e hana ana i kahi ʻano laina a me ka crystalline kiʻekiʻe.
2. Puna:
Starch etera:
Loaʻa ka starch mai nā mea kanu e like me ke kulina, ka palaoa a me ka ʻuala. ʻO kēia mau mea kanu nā waihona o ka starch a hiki ke lawe ʻia a hoʻoponopono ʻia nā ether starch.
Cellulose ether:
ʻO ka Cellulose ka mea nui o nā paia o nā mea kanu a nui ke ola ma ke ʻano. ʻO nā kumu maʻamau o ka cellulose ʻo ia ka pulp lāʻau, ka pulupulu, a me nā mea kanu like ʻole. Hoʻokumu ʻia nā cellulose ethers ma ka hoʻololi ʻana i nā molekala cellulose i unuhi ʻia mai kēia mau kumu.
3. Etherification kaʻina hana:
Starch etera:
ʻO ke kaʻina hana etherification o ka starch ka hoʻokomo ʻana i nā pūʻulu ether i loko o nā pūʻulu hydroxyl (OH) i loaʻa i loko o nā molekala starch. ʻO nā pūʻulu ether maʻamau i hoʻohui ʻia me methyl, ethyl, hydroxyethyl, a me hydroxypropyl, ka hopena i nā loli i nā waiwai o ka starch i hoʻololi ʻia.
Cellulose ether:
ʻO ka etherification o cellulose e pili ana i kahi kaʻina like i hoʻokomo ʻia nā hui ether i loko o nā pūʻulu hydroxyl o cellulose. ʻO nā derivatives cellulose ether maʻamau ka methylcellulose, ethylcellulose, hydroxyethylcellulose a me carboxymethylcellulose.
4. Solubility:
Starch etera:
Loaʻa ka haʻahaʻa haʻahaʻa o ka hoʻoheheʻe wai ma mua o ka cellulose ethers. Ma muli o ka pūʻulu ether kūikawā i hoʻopili ʻia i ka wā o ka hoʻololi ʻana, hiki iā lākou ke hōʻike i nā pae like ʻole o ka solubility.
Cellulose ether:
Ua ʻike ʻia nā cellulose ethers no ko lākou wai-soluble a wai-dispersible waiwai. Pili ka solubility i ke ʻano a me ke ʻano o ka hoʻololi ʻana i ka ether.
5. Hana kiʻiʻoniʻoni:
Starch etera:
Loaʻa i nā ether starch nā mana hana kiʻiʻoniʻoni ma muli o ko lākou ʻano semi-crystalline. ʻAʻole liʻiliʻi a liʻiliʻi paha ke kiʻiʻoniʻoni i hana ʻia mai ka cellulose ethers.
Cellulose ether:
ʻO nā cellulose ethers, ʻoi aku ka nui o kekahi mau derivatives e like me methylcellulose, ua ʻike ʻia no kā lākou mau waiwai hana kiʻiʻoniʻoni maikaʻi loa. Hiki iā lākou ke hana i nā kiʻiʻoniʻoni maʻalahi a maʻalahi, e hoʻolilo iā lākou i mea waiwai i nā noi e like me nā uhi a me nā mea hoʻopili.
6. Rheological waiwai:
Starch etera:
Hiki i nā ethers starch ke ho'onui i ka viscosity o nā hā'ina wai, akā 'oko'a paha kā lākou hana rheological mai ka cellulose ethers. ʻO ka hopena ma ka viscosity e pili ana i nā mea e like me ke degere o ka hoʻololi a me ke kaumaha mole.
Cellulose ether:
Ua ʻike nui ʻia nā cellulose ethers no ko lākou hiki ke hoʻomalu rheology. Hiki iā lākou ke hoʻopili nui i ka viscosity, ka mālama ʻana i ka wai a me nā waiwai kahe i nā ʻano noi like ʻole me nā pena, nā mea hoʻopili a me nā mea hana.
7. Noi:
Starch etera:
Hiki ke hoʻohana ʻia nā ether starch i nā ʻoihana meaʻai, textile a me nā lāʻau lapaʻau. I ka ʻoihana kūkulu, hoʻohana ʻia lākou i nā mortars, plasters a me nā mea hoʻopili e hoʻomaikaʻi i nā waiwai e like me ka paʻa ʻana o ka wai a me ka hana.
Cellulose ether:
Hoʻohana nui ʻia nā cellulose ethers i nā lāʻau lapaʻau, nā meaʻai, nā mea hoʻonaninani a me nā kahua kūkulu. Hoʻohana nui ʻia lākou e like me nā mānoanoa, stabilizers a me rheology modifiers i nā pena, nā morta, nā tile adhesives a me nā ʻano hana like ʻole.
8. Hiki i ka biodegradability:
Starch etera:
Loaʻa ka starch ethers mai nā mea kanu a hiki i ka biodegradable. Kōkua lākou i ka hoʻonui ʻana i ka hoʻomau o nā huahana i hoʻohana ʻia.
Cellulose ether:
ʻO nā ether cellulose i loaʻa mai ka cellulose mea kanu he biodegradable nō hoʻi. ʻO kā lākou kūlike kaiapuni kahi mea nui i nā noi kahi mea nui ka hoʻomau.
i ka hopena:
ʻOiai ʻo ka starch ethers a me ka cellulose ethers kaʻana like i kekahi mau mea maʻamau e like me ka polysaccharide derivatives, ko lākou mau ʻano kemika kūʻokoʻa, nā kumu, ka solubility, nā waiwai hana kiʻiʻoniʻoni, nā ʻano rheological a me nā noi i hoʻokaʻawale iā lākou no ka hoʻohana ʻana ma nā ʻano āpau. ʻO nā ether starch i loaʻa mai ka starch a me ka cellulose ethers i loaʻa mai ka cellulose i kēlā me kēia me nā pono kūʻokoʻa i nā kūlana like ʻole. He mea koʻikoʻi ka hoʻomaopopo ʻana i kēia mau ʻokoʻa i ke koho ʻana i ka ether kūpono no kahi noi kikoʻī, e hōʻoia i ka hana maikaʻi loa a me nā ʻano i makemake ʻia.
Ka manawa hoʻouna: Jan-25-2024