Loaʻa nā huahana huaora a pau mai ka pulp pulupulu maoli a i ʻole ka pulp lāʻau, i hana ʻia ma o ka etherification. Hoʻohana nā huahana cellulose like ʻole i nā mea etherifying like ʻole. ʻO ka mea etherifying i hoʻohana ʻia i loko o ka hydroxyethyl cellulose (HEC) ʻo ia ka ethylene oxide, a ʻo ka mea etherifying i hoʻohana ʻia i loko o ka hydroxypropyl methylcellulose (HPMC) he mau ʻano ʻē aʻe o nā mea etherifying (chloromethane a me propylene oxide).
I loko o ka pena szone maoli a me ka pena latex, hiki ke hoʻohana ʻia ka hydroxyethyl cellulose ma ke ʻano he mea hoʻomānoanoa.
He maʻalahi ka pena pōhaku maoli e hoʻoheheʻe ʻia ma muli o kona nui o ka ʻākoakoa a me ke ʻano kikoʻī. Pono e hoʻohui i kahi mea hoʻomānoanoa e hoʻonui i kona mānoanoa e hoʻokō i ka mānoanoa e pono ai no ka pīpī ʻana i ka wā o ke kūkulu ʻana, hoʻomaikaʻi i kona kūpaʻa mālama ʻana, a loaʻa i kahi ikaika.
Inā makemake ʻoe i ka pena pōhaku maoli e hoʻokō i ka ikaika maikaʻi, ke kūpaʻa maikaʻi i ka wai a me ke kūpaʻa i ka wā, he mea nui loa ke koho ʻana i nā mea maka a me ka hoʻolālā ʻana o ke ʻano.
Ma lalo o nā kūlana maʻamau, e kiʻekiʻe loa ka nui o ka emulsion i hoʻohana ʻia i ka pena pōhaku maoli kiʻekiʻe.
No ka laʻana, i loko o hoʻokahi tona o ka pena pōhaku maoli, aia paha he 300kg o ka emulsion acrylic maʻemaʻe a me 650kg o ke one pōhaku kala maoli. Ke 50% ka nui o ka emulsion, ʻo ka nui o 300kg o ka emulsion ma hope o ka maloʻo ʻana ma kahi o 150 lita, a ʻo ka nui o 650kg o ke one ma kahi o 228 lita. ʻO ia hoʻi, ʻo ka PVC (pigment volume concentration) o ka pena pōhaku maoli he 60% i kēia manawa, no ka mea, he nui a ʻano ʻē nā ʻāpana o ke one kala, a ma lalo o ke kūlana o kahi hoʻolaha nui o nā ʻāpana, hiki i ka pena pōhaku maoli maloʻo ke noho i loko o ka CPVC (critical mass concentration). Pigment volume concentration) kokoke. No ka mea hoʻomānoanoa, inā koho ʻoe i ka cellulose me ka viscosity kūpono, hiki i ka pena pōhaku maoli ke hana i kahi kiʻiʻoniʻoni pena piha a mānoanoa e hoʻokō i nā koi hana nui ʻekolu o ka pena pōhaku maoli. Inā haʻahaʻa ka ʻike o ka emulsion pena pōhaku maoli, ua ʻōlelo ʻia e hoʻohana i ka cellulose me ka viscosity kiʻekiʻe e like me ka thickener (e like me 100,000 viscosity), ʻoi aku hoʻi ma hope o ka piʻi ʻana o ke kumukūʻai o ka cellulose, hiki ke hōʻemi i ka nui o ka cellulose i hoʻohana ʻia a hana i ka pōhaku maoli i ʻoi aku ka maikaʻi o ka hana o ka pena.
Hoʻohana kekahi mau mea hana pena pōhaku maoli i ka hydroxypropyl methylcellulose ma kahi o ka hydroxyethyl cellulose no ke kumukūʻai a me nā kumu ʻē aʻe.
Ke hoʻohālikelike ʻia me nā ʻano cellulose ʻelua, ʻoi aku ka maikaʻi o ka paʻa ʻana o ka wai o ka hydroxyethyl cellulose, ʻaʻole e nalowale ka paʻa ʻana o ka wai ma muli o ka gelatin i ka mahana kiʻekiʻe, a he kūpaʻa iki kona i ka mildew. No ka hana pono ʻana, ua ʻōlelo ʻia e hoʻohana i ka hydroxyethyl cellulose me ka viscosity o 100,000 ma ke ʻano he mea hoʻomānoanoa no ka pena pōhaku maoli.
Ka manawa hoʻouna: ʻApelila-28-2023