Ka Hoʻohana ʻana o ka Hydroxyethyl Cellulose (HEC) i ka Pena Latex

Pono nā mea hoʻomānoanoa no nā pena latex e kūlike maikaʻi me nā hui polymer latex, inā ʻaʻole, e liʻiliʻi ka nui o ke ʻano i loko o ka ʻili uhi, a e loaʻa ka hōʻuluʻulu ʻāpana hiki ʻole ke hoʻihoʻi ʻia, e hopena ana i ka emi ʻana o ka viscosity a me ka nui o nā ʻāpana coarser. E hoʻololi nā mea hoʻomānoanoa i ka uku o ka emulsion. No ka laʻana, e loaʻa i nā mea hoʻomānoanoa cationic kahi hopena hiki ʻole ke hoʻihoʻi ʻia i nā emulsifiers anionic a hana i ka demulsification. Pono kahi mea hoʻomānoanoa pena latex kūpono i nā waiwai penei:

1. Haʻahaʻa ka nui a me ka mānoanoa maikaʻi

2. Paʻa maikaʻi ka mālama ʻana, ʻaʻole e hōʻemi i ka viscosity ma muli o ka hana a nā enzymes, a ʻaʻole e hōʻemi i ka viscosity ma muli o nā loli o ka mahana a me ka waiwai pH

3. Paʻa wai maikaʻi, ʻaʻohe pehu ea maopopo

4. ʻAʻohe hopena ʻaoʻao ma nā waiwai kiʻiʻoniʻoni pena e like me ke kūpaʻa ʻana i ka scrub, ka gloss, ka mana hūnā a me ke kūpaʻa wai

5. ʻAʻohe flocculation o nā pigments

ʻO ka ʻenehana hoʻomānoanoa o ka pena latex he ana koʻikoʻi ia e hoʻomaikaʻi i ka maikaʻi o ka latex a hōʻemi i nā kumukūʻai. ʻO ka Hydroxyethyl cellulose kahi mea hoʻomānoanoa kūpono, nona nā hopena multifunctional i ka hoʻomānoanoa, ka hoʻopaʻa ʻana a me ka hoʻoponopono rheological o ka pena latex.

I ke kaʻina hana o ka pena latex, hoʻohana ʻia ka hydroxyethyl cellulose (HEC) ma ke ʻano he mea hoʻolaha, mea hoʻomānoanoa a me ka mea hoʻokuʻu pigment e hoʻopaʻa i ka viscosity o ka huahana, e hōʻemi i ka agglomeration, e hana i ka ʻili pena i maʻalahi a palupalu, a e hoʻoikaika i ka pena latex. Rheology maikaʻi, hiki ke kū i ka ikaika shear kiʻekiʻe, a hiki ke hāʻawi i ka pae maikaʻi, ke kū'ē ʻana i ke kahakaha a me ke kūlike o ka pigment. I ka manawa like, loaʻa iā HEC ka hana maikaʻi loa, a ʻo ka pena latex i hoʻomānoanoa ʻia me HEC he pseudoplasticity, no laila ʻo ka palaki ʻana, ka ʻōwili ʻana, ka hoʻopiha ʻana, ka pīpī ʻana a me nā ʻano hana kūkulu ʻē aʻe he mau pono o ka mālama ʻana i ka hana, ʻaʻole maʻalahi ke hoʻomaʻemaʻe, sag, a emi ka splashing. Loaʻa iā HEC ka hoʻomohala kala maikaʻi loa. Loaʻa iā ia ka miscibility maikaʻi loa no ka hapa nui o nā kala a me nā mea hoʻopaʻa, kahi e loaʻa ai i ka pena latex ke kūlike kala a me ke kūpaʻa maikaʻi loa. Versatility no ka noi ʻana i nā formulations, he non-ionic ether ia. No laila, hiki ke hoʻohana ʻia i kahi laulā pH ākea (2 ~ 12), a hiki ke hui pū ʻia me nā ʻāpana i ka pena latex maʻamau e like me nā pigments reactive, nā mea hoʻohui, nā paʻakai soluble a i ʻole electrolytes.

ʻAʻohe hopena maikaʻi ʻole ma ka ʻili uhi, no ka mea, he ʻano ʻike maopopo ka wai o ka wai HEC, ʻaʻole maʻalahi ka huʻa i ka wā o ka hana ʻana a me ke kūkulu ʻana, a ʻoi aku ka liʻiliʻi o ke ʻano o nā lua pele a me nā pinholes.

Paʻa maikaʻi ka mālama ʻana. I ka wā e mālama ai i ka wā lōʻihi, hiki ke mālama ʻia ka hoʻopuehu ʻana a me ka hoʻokuʻu ʻana o ka pigment, a ʻaʻohe pilikia o ke kala lana a me ka pua ʻana. He liʻiliʻi ka papa wai ma luna o ka ʻili o ka pena, a i ka wā e loli nui ai ka mahana o ka mālama ʻana. Paʻa mau kona mānoanoa.

Hiki i ka HEC ke hoʻonui i ka waiwai PVC (pigment volume concentration) solid composition a hiki i ka 50-60%. Eia kekahi, hiki i ka mea hoʻomānoanoa o ka pena wai ke hoʻohana i ka HEC.

I kēia manawa, ʻo nā mea hoʻomānoanoa i hoʻohana ʻia i nā pena latex waena a me ke kiʻekiʻe o ka home he HEC a me ka polymer acrylic (me ka polyacrylate, homopolymer a i ʻole copolymer emulsion thickeners o ka acrylic acid a me ka methacrylic acid) i lawe ʻia mai.

Hiki ke hoʻohana ʻia ka Hydroxyethyl cellulose no nā hana

1. Ma ke ʻano he mea hoʻoheheʻe a pale paha

Ma keʻano laulā, hoʻohana ʻia ka HEC me ka mānoanoa o 10-30mPaS. ʻO ka HEC hiki ke hoʻohana ʻia a hiki i 300mPa·S e loaʻa ka hopena hoʻopuehu maikaʻi inā hoʻohana ʻia me ka hui pū ʻana me nā surfactants anionic a cationic paha. ʻO ka nui o ka lāʻau kuhikuhi he 0.05% o ka nui monomer.

2. Ma ke ʻano he mea hoʻomānoanoa

E hoʻohana i ka 15000mPa. ʻO ka nui kuhikuhi o ka HEC viscosity kiʻekiʻe ma luna o s he 0.5-1% o ka nuipaʻa o ka pena latex, a hiki i ka waiwai PVC ke hiki i kahi 60%. E hoʻohana i ka HEC ma kahi o 20Pa,s i ka pena latex, a ʻo ka hana o ka pena latex ka mea maikaʻi loa. ʻOi aku ka haʻahaʻa o ke kumukūʻai o ka hoʻohana wale ʻana iā HEC ma luna o 30O00Pa.s. Eia naʻe, ʻaʻole maikaʻi nā waiwai pae o ka pena latex. Mai ka manaʻo o nā koi maikaʻi a me ka hoʻemi ʻana i ke kumukūʻai, ʻoi aku ka maikaʻi o ka hoʻohana pū ʻana i ka HEC viscosity waena a me ke kiʻekiʻe.

3. Ke ʻano kāwili ʻana i ka pena latex

Hiki ke hoʻohui ʻia ka HEC i mālama ʻia ma ka ʻili ma ke ʻano pauka maloʻo a i ʻole ke ʻano kāpili. Hoʻohui pololei ʻia ka pauka maloʻo i ka wili pigment. Pono ka pH ma ke kiko hānai he 7 a haʻahaʻa paha. Hiki ke hoʻohui ʻia nā ʻāpana alkaline e like me ka Yanbian dispersant ma hope o ka pulu ʻia ʻana o ka HEC a hoʻopuehu piha ʻia. Pono e hoʻohui ʻia nā slurries i hana ʻia me HEC i loko o ka slurry ma mua o ka loaʻa ʻana o ka manawa kūpono o ka HEC e hoʻomaʻū a ʻae i ka mānoanoa i kahi kūlana hiki ʻole ke hoʻohana ʻia. Hiki nō hoʻi ke hoʻomākaukau i ka pulp HEC me nā mea hoʻohuihui ethylene glycol.

4. Anti-mold o ka pena latex

E palaho ka HEC wai-hoʻoheheʻe ʻia i ka wā e pili ana me nā ʻōmole i loaʻa nā hopena kūikawā ma ka cellulose a me kāna mau mea i loaʻa. ʻAʻole lawa ka hoʻohui ʻana i nā mea mālama i ka pena wale nō, pono nā ʻāpana āpau e ʻole ka enzyme. Pono e mālama ʻia ke kaʻa hana o ka pena latex maʻemaʻe, a pono e hoʻomaʻemaʻe mau ʻia nā lako āpau me ka mahu 0.5% formalin a i ʻole ka hopena mercury O.1%.