Loaʻa nā huahana huaora mai ka pulupulu pulupulu maoli a i ʻole ka pulp lāʻau, i hana ʻia ma o ka etherification. Hoʻohana nā huahana cellulose ʻokoʻa i nā mea etherifying like ʻole. ʻO ka etherifying agent i hoʻohana ʻia i ka hydroxyethyl cellulose (HEC) ʻo ia ka ethylene oxide, a ʻo ka mea etherifying agent i hoʻohana ʻia i ka hydroxypropyl methylcellulose (HPMC) he ʻano ʻē aʻe o ka etherifying agents. (chloromethane a me propylene oxide).
Ma ka pena szone maoli a me ka pena latex, hiki ke hoʻohana ʻia ka hydroxyethyl cellulose ma ke ʻano he mānoanoa.
ʻO ka pena pōhaku maoli he maʻalahi ke hoʻoheheʻe ʻia ma muli o ka nui o ka aggregate a me ka kikoʻī nui. Pono e hoʻohui i kahi mānoanoa e hoʻonui i kona viscosity e hoʻokō i ka viscosity i koi ʻia 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 ai i ka ikaika maikaʻi, ke kūpaʻa wai maikaʻi a me ka pale ʻana i ka wā, he mea nui ke koho ʻana i nā mea maka a me ka hoʻolālā ʻana o ke ʻano.
Ma lalo o nā kūlana maʻamau, ʻoi aku ka kiʻekiʻe o 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 paʻa 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 nā ʻāpana o ke one waihoʻoluʻu a ʻano like ʻole i ke ʻano, a ma lalo o ke ʻano o kahi puʻupuʻu nui o ka ʻāpana, ka maloʻo. ʻO ka pena pōhaku maoli paha i loko o ka CPVC (critical mass concentration). ʻO ka hoʻopaʻa ʻana o ka nui o ka puaʻa) approx. E pili ana i ka mānoanoa, inā koho ʻoe i ka cellulose me kahi viscosity kūpono, hiki i ka pena pōhaku maoli ke hana i kahi kiʻi pena piha piha a paʻa hoʻi e hoʻokō i nā koi hana nui ʻekolu o ka pena pōhaku maoli. Inā haʻahaʻa ka maʻiʻo o ka emulsion pena pōhaku maoli, ua ʻōlelo ʻia e hoʻohana i ka cellulose me ka viscosity kiʻekiʻe e like me kahi mānoanoa (e like me 100,000 viscosity), ʻoi aku ma hope o ka piʻi ʻana o ke kumukūʻai o ka cellulose, hiki ke hoʻemi i ka nui o ka cellulose i hoʻohana ʻia a hana i ka. pōhaku maoli ʻOi aku ka maikaʻi o ka hana ʻana 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 mālama wai ʻana o ka hydroxyethyl cellulose, ʻaʻole e nalowale ka paʻa wai ma muli o ka gelatin i ke kiʻekiʻe wela, a loaʻa iā ia ke kūʻē i ka maʻi. No ka noʻonoʻo ʻana i ka hana, ʻōlelo ʻia e hoʻohana i ka hydroxyethyl cellulose me ka viscosity o 100,000 ma ke ʻano he mānoanoa no ka pena pōhaku maoli.
Ka manawa hoʻouna: Apr-28-2023