Hoʻohālikelike o HEC a me HPMC i nā noi uhi

I ka ʻoihana uhi hou, i mea e hoʻomaikaʻi ai i nā waiwai rheological, ke kūpaʻa mālama a me ka hana kūkulu o ka uhi ʻana, pono pinepine ia e hoʻohui i kekahi mau mea hoʻohui polymer hana. I waena o lākou,hydroxyethyl cellulose (HEC)a mehydroxypropyl methylcellulose (HPMC)ʻelua mau mea hoʻomānoanoa a me nā mea hoʻopaʻa i hoʻohana nui ʻia no ka cellulose ether. ʻOiai he mau ether cellulose non-ionic lāua ʻelua, aia nā ʻokoʻa maopopo i ke ʻano kemika, nā ʻano hana a me nā hopena noi i nā uhi.

1. ʻAno kemika a me ka hiki ke hoʻoheheʻe ʻia

He polymer non-ionic wai-soluble ʻo HEC i hana ʻia mai ka cellulose kūlohelohe ma ka hoʻokomo ʻana i nā hui hydroxyethyl ma o ka hopena etherification. He waiwai nui kona ʻano molekala i nā hui hydrophilic hydroxyl a me hydroxyethyl, ka mea e loaʻa ai ka solubility wai maikaʻi. Hiki iā HEC ke hoʻoheheʻe koke i ka wai anuanu e hana i kahi hopena viscous moakaka.

He polymer ka HPMC i hoʻokumu ʻia ma ka hoʻokomo ʻana i nā hydroxypropyl a me nā methyl substituents ma nā mole cellulose. Ma muli o ke alo o kāna hui methyl hydrophobic, ʻoi aku ka maikaʻi o ka hana ʻili a me nā waiwai hana kiʻiʻoniʻoni ma mua o HEC. Pehu mālie ka HPMC i ka wai anuanu, lawe i kahi manawa e hoʻoheheʻe loa ai, a ua hoʻopilikia nui ʻia e ka mahana.

2. Hoʻohālikelike o nā waiwai rheological

He ʻano rheological linear ko HEC, e hōʻike ana i ka pseudoplasticity, ʻo ia hoʻi, nā ʻano shear-thinning, a kūpono ia no nā ʻōnaehana uhi e pono ai ka pae maikaʻi. Hoʻemi ʻia ka viscosity o ka hopena HEC ma lalo o ke kiʻekiʻe o ka shear, kahi e kōkua ai me ka palaki ʻana, ka uhi ʻana i ka wili a me ka pae i ka wā o ke kūkulu ʻana.

Hōʻike ka hopena HPMC i ke ʻano pseudoplastic ikaika, me ka viscosity kiʻekiʻe ma lalo o ka shear haʻahaʻa, kahi e kōkua ai i ka pale ʻana i ka sedimentation a me ka sagging; emi nui ka viscosity ma lalo o ka shear kiʻekiʻe, kahi e kōkua ai i ka hoʻomaikaʻi ʻana i ke kūkulu ʻana. No laila, hana maikaʻi ʻo HPMC i nā noi uhi facade e pono ai nā waiwai anti-sagging ikaika.

3. Ka paʻa ʻana o ka wai a me ka hana kūkulu hale

ʻOi aku ka maikaʻi o ka paʻa ʻana o ka wai o HPMC ma mua o HEC, ʻoi aku hoʻi i nā wahi maloʻo a i ʻole nā ​​​​kūlana wela kiʻekiʻe, hiki i ka HPMC ke hoʻopaneʻe pono i ka mahu ʻana o ka wai a pale i ka nahā a i ʻole ka emi ʻana o ka ʻili uhi. ʻO kēia ka mea e hoʻohana nui ʻia ai ka HPMC i nā uhi putty, gypsum a me ka sima, kūpono loa no nā hana pena i ke kauwela a i ʻole nā ​​​​​​aniani maloʻo.

ʻOiai he hana paʻa wai ko HEC, ʻoi aku ka haʻahaʻa o ka hopena ma mua o HPMC, ʻoi aku hoʻi i ke kaiapuni wela a me ka wikiwiki o ka makani. ʻO kona paʻa ʻole ʻana i ka wai e hiki ai ke maloʻo wikiwiki ma hope o ke kūkulu ʻana, a laila e hoʻopilikia ana i ka mānoanoa a me ka palahalaha o ka uhi ʻana.

4. Ke kū'ē ʻana i ka enzyme a me ka biodegradability

Loaʻa i ka HEC kahi nui o nā hui hydroxyethyl i loko o kona ʻano a maʻalahi hoʻi e hoʻohaumia ʻia e nā microorganism. No laila, ʻaʻole maikaʻi kona kūpaʻa ʻana i ka enzyme, ʻoiai inā mālama ʻia no ka manawa lōʻihi, hiki ke hōʻino ʻia, a pono e hoʻohui ʻia nā mea mālama e hoʻolōʻihi i ka manawa mālama.

ʻOi aku ka maikaʻi o ke kūpaʻa ʻana o ka HPMC i ka enzyme ma mua o HEC a ʻoi aku ka paʻa. He kūpono loa ia no nā uhi ʻoihana me nā koi kūpaʻa mālama kiʻekiʻe.

5. Ke kumukūʻai a me ka noi mākeke

Mai kahi hiʻohiʻona kumukūʻai, he haʻahaʻa ke kumukūʻai o HEC a kūpono no nā huahana uhi hoʻolālā nui a haʻahaʻa ke kumukūʻai. ʻO kona hopena mānoanoa maikaʻi a me ke kahe ʻana e loaʻa ai kahi māhele mākeke kiʻekiʻe i nā noi e like me nā uhi paia o loko a me nā pena latex haʻahaʻa.

ʻOiai ʻoi aku ke kumukūʻai o ka HPMC, ʻo kāna hana piha maikaʻi loa e hoʻohana nui ʻia ai i nā ʻōnaehana uhi waena a kiʻekiʻe, ʻoi aku hoʻi i nā manawa me nā koi kiʻekiʻe no ka hana kūkulu, anti-sagging a me ka paʻa ʻana o ka wai, e like me nā uhi paia o waho, nā uhi elastic, a me nā uhi kūpaʻa i ka wā.

6. Kaiapuni a me ka palekana

He mau ʻetera cellulose non-ionic nā mea ʻelua, he kūlike maikaʻi ko lākou i ke kaiapuni a me ka biodegradability, ʻaʻohe o lākou mau hui organik volatile (VOC), a kūlike me ke ʻano o ka hoʻomohala ʻana o nā uhi ʻōmaʻomaʻo a me ke kaiapuni. Eia nō naʻe, i ka wā e hoʻohana ai, pono e uku ʻia ka makaʻala i kona lepo a me ka hygroscopicity, a pono e mālama ʻia ka palekana hana e pono ai.

HECa meHPMCLoaʻa i kēlā me kēia ko lākou mau pono ponoʻī i nā noi uhi. ʻOi aku ka kūpono o HEC no nā huahana uhi e kālele ana i ka kaohi kumukūʻai a he mau koi kiʻekiʻe no ke kahe ʻana o ke kūkulu ʻana; ʻoiai ua hoʻohana nui ʻia ʻo HPMC i nā uhi waena a kiʻekiʻe me nā koi hana kiʻekiʻe ma muli o kona paʻa wai maikaʻi, anti-sagging a me ka hana kūkulu. I nā noi maoli, pono e koho pono ʻia ʻo HEC a i ʻole HPMC ma muli o nā mea e like me nā koi hana o ke ʻano uhi, nā ʻano hana kūkulu a me nā kūlana aniau, a hiki ke hoʻohana pū ʻia e like me ka mea e pono ai e hoʻokō i ka hana piha maikaʻi aʻe.