ʻO ka cellulose kahi polysaccharide e hana i nā ʻano eter hiki ke hoʻoheheʻe ʻia i ka wai. ʻO nā mea mānoanoa o ka cellulose he polymers hiki ke hoʻoheheʻe ʻia i ka wai. He lōʻihi loa kona mōʻaukala hoʻohana, ʻoi aku ma mua o 30 mau makahiki, a he nui nā ʻano. Hoʻohana mau ʻia lākou i nā pena latex āpau a ʻo ia ke kumu nui o nā mānoanoa. He mea maikaʻi loa ka mānoanoa cellulosic i nā ʻōnaehana wai no ka mea e mānoanoa lākou i ka wai. I loko o ka ʻoihana pena, ʻo ka mea maʻamau i hoʻohana ʻia i ka mānoanoa cellulose:methyl cellulose (MC), hydroxyethyl cellulose (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC),hydroxypropyl methyl cellulose (HPMC)a me ka hydrophobically modified hydroxyethyl cellulose (HMHEC). He polysaccharide hiki ke hoʻoheheʻe wai ʻia ʻo HEC i hoʻohana nui ʻia i ka mānoanoa o nā pena latex a me ka semi-gloss. Loaʻa nā mānoanoa i nā māka viscosity like ʻole a me nā mea mānoanoa me kēia cellulose i loaʻa ka hoʻohālikelike kala maikaʻi a me ka paʻa o ka mālama ʻana.
ʻO ka pae ʻana, anti-splash, hana kiʻiʻoniʻoni a me nā waiwai anti-sagging o ke kiʻi uhi e hilinaʻi ʻia ma ke kaumaha molekala pili oHEC. ʻO HEC a me nā polymers hiki ʻole i ka wai i hoʻopaʻa ʻia e mānoanoa i ka pae wai o ka uhi. Hiki ke hoʻohana wale ʻia nā mānoanoa cellulose a i hui pū ʻia me nā mānoanoa ʻē aʻe e loaʻa ai ka rheology kūikawā. Hiki i nā cellulose ethers ke loaʻa nā mea kaupaona pili like ʻole a me nā māka viscosity like ʻole, mai kahi haʻahaʻa haʻahaʻa haʻahaʻa 2% aqueous solution me ka viscosity ma kahi o 10 mP s i kahi kiʻekiʻe molecular weight viscosity o 100 000 mP s. Hoʻohana mau ʻia nā māka kaumaha molekala haʻahaʻa e like me nā colloids pale i ka polymerization emulsion paint latex, a hoʻohana ʻia nā māka maʻamau (viscosity 4 800–50 000 mP·s) i mea mānoanoa. ʻO ke ʻano o kēia ʻano mānoanoa ma muli o ka hydration kiʻekiʻe o nā paʻa hydrogen a me ka entanglement ma waena o nā kaulahao mole.
ʻO ka cellulose kuʻuna he polymer kaumaha molekala kiʻekiʻe e mānoanoa nui ma o ka hoʻopili ʻana ma waena o nā kaulahao mole. Ma muli o ka viscosity kiʻekiʻe ma ka liʻiliʻi shear rate, ʻilihune ka waiwai pae, a pili ia i ka nani o ke kiʻi uhi. Ma ke kiʻekiʻe o ka shear rate, haʻahaʻa ka viscosity, maikaʻi ʻole ka pale ʻana o ka splash o ke kiʻi uhi, a ʻaʻole maikaʻi ka piha o ke kiʻi uhi. ʻO nā hiʻohiʻona noi o HEC, e like me ke kūpaʻa o ka brush, ke kiʻi ʻoniʻoni a me ka roller spatter, pili pono i ke koho o ka mānoanoa. ʻO kāna mau waiwai kahe e like me ka pae ʻana a me ka pale ʻana i ka sag e pili nui ʻia e nā mānoanoa.
Hydrophobically modified cellulose (HMHEC) he cellulose mānoanoa i loaʻa ka hydrophobic hoʻololi i kekahi mau kaulahao lālā (ua hoʻokomo ʻia kekahi mau pūʻulu alkyl kaulahao lōʻihi ma ke kaulahao nui o ka hale). ʻOi aku ka viscosity kiʻekiʻe o kēia uhi i nā kiʻekiʻe shear rates a no laila ʻoi aku ka maikaʻi o ka hoʻokumu ʻana i ke kiʻiʻoniʻoni. E like me Natrosol Plus Grade 330, 331, Cellosize SG-100, Bermocoll EHM-100. Hoʻohālikelike ʻia kona hopena mānoanoa me ka cellulose ether thickeners me ka nui o ka nui o ka molekala pili. Hoʻonui ia i ka viscosity a me ka pae ʻana o ICI, a hoʻemi i ka ʻili o ka ʻili. No ka laʻana, ka ʻili o ka HEC ma kahi o 67 mN / m, a ʻo ka ʻili o ka HMHEC he 55 ~ 65 mN / m.
He maikaʻi loa ka HMHEC i ka sprayability, anti-sagging, leveling properties, good gloss and anti-pigment caking. Hoʻohana nui ʻia a ʻaʻohe hopena maikaʻi ʻole i ka hoʻokumu ʻana i ke kiʻiʻoniʻoni o nā pena latex nui. ʻO ka hana kiʻiʻoniʻoni maikaʻi a me ka hana anti-corrosion. ʻOi aku ka maikaʻi o kēia mānoanoa hui pū me nā ʻōnaehana vinyl acetate copolymer a loaʻa iā ia nā waiwai e like me nā mānoanoa hui ʻē aʻe, akā me nā hana maʻalahi.
Ka manawa hoʻouna: Apr-25-2024