Ka hopena mānoanoa o ka hydroxypropyl methylcellulose

Hāʻawi ka Hydroxypropyl methylcellulose i ka mortar pulu me ka viscosity maikaʻi loa, hiki ke hoʻonui nui i ka hiki ke hoʻopaʻa ʻia ma waena o ka mortar pulu a me ka papa kumu, a hoʻomaikaʻi i ka hana anti-sag o ka mortar. Hoʻohana nui ʻia ia i ka plastering mortar, waho o ka paia insulation system and brick bonding in mortar. ʻO ka hopena mānoanoa o ka cellulose ether hiki ke hoʻonui i ka homogeneity a me ka anti-dispersion hiki o nā mea i hoʻohui ʻia i ka sima hou, e pale i ka delamination, ka hoʻokaʻawale ʻana a me ke kahe ʻana o ka mortar a me ka ʻuala, a hiki ke hoʻohana ʻia i ka fiber concrete, underwater concrete and self-compacting concrete. .

Hydroxypropyl methylcelluloseHPMChoʻonui i ka viscosity o nā mea i hoʻokumu ʻia i ka sima mai ka viscosity o ka solution cellulose ether. Hoʻohana pinepine ʻia ka index o "viscosity" e loiloi i ka viscosity o ka solution cellulose ether. ʻO ka viscosity o ka cellulose ether ka mea maʻamau i ka cellulose ether solution me kahi kikoʻī (e like me 2%). ʻO ka wikiwiki (a i ʻole ka nui o ka hoʻololi ʻana, e like me 20 rpm), ka waiwai viscosity i ana ʻia me kahi mea ana i ʻōlelo ʻia (e like me ka viscometer rotational).

He mea koʻikoʻi ka viscosity e loiloi i ka hana o ka cellulose ether. ʻOi aku ka kiʻekiʻe o ka viscosity o ka hydroxypropyl methylcellulose solution, ʻoi aku ka maikaʻi o ka viscosity o nā mea sima, ʻoi aku ka maikaʻi o ka hoʻopili ʻana i ka substrate, a ʻoi aku ka maikaʻi o ka anti-sagging a me ka anti-dispersion. ʻO ka ikaika, akā inā ʻoi aku ka nui o kona viscosity, e hoʻopilikia ia i ka wai a me ka hoʻohana ʻana o nā mea hana sima (e like me ke kuʻi ʻana i ka pahi plastering i ka wā e hana ai i ka mortar). No laila, ʻo ka viscosity o cellulose ether i hoʻohana ʻia i ka mortar maloʻo i hui pū ʻia he 15,000 ~ 60,000 mPa. ʻO S-1, ka momi hoʻopaʻa ponoʻī a me ka paʻa paʻa ponoʻī, e koi ana i ka wai kiʻekiʻe, koi i ka viscosity haʻahaʻa o ka cellulose ether.

Eia kekahi, ʻo ka hopena mānoanoa o ka hydroxypropyl methylcellulose e hoʻonui i ka koi wai o nā mea i hoʻokumu ʻia i ka sima, a laila e hoʻonui ai i ka hua o ka mortar.

ʻO ka viscosity o ka hydroxypropyl methylcellulose solutions e pili ana i nā kumu aʻe:

ʻO ke kaumaha molekala (a i ʻole ka degere o ka polymerization) a me ka neʻe ʻana o ka cellulose ether, ka wela o ka hopena, ka nui o ka shear a me ke ʻano hoʻāʻo.

1. ʻO ke kiʻekiʻe o ka polymerization o ka cellulose ether a me ka nui o ke kaumaha mole, ʻoi aku ka kiʻekiʻe o ka viscosity o kāna ʻano wai;

2. ʻO ke kiʻekiʻe o ke ʻano o ka cellulose ether, ʻoi aku ka kiʻekiʻe o ka viscosity o kāna hoʻonā wai, akā pono e mālama pono i ke koho ʻana i ke ʻano kūpono i ka wā e hoʻohana ai, i ʻole e hoʻopilikia i ka hana o ka mortar a me ka palaki inā e kiʻekiʻe loa ka dosage;

3. E like me ka nui o nā wai, e emi ana ka viscosity o ka solution cellulose ether me ka piʻi ʻana o ka mahana, a ʻoi aku ka kiʻekiʻe o ka neʻe ʻana o ka cellulose ether, ʻoi aku ka nui o ka mana o ka wela;

4. He pseudoplastic ka hopena o ka cellulose ether, nona ka waiwai o ka shear thinning. ʻOi aku ka nui o ka shear rate i ka wā o ka hoʻāʻo ʻana, ʻoi aku ka haʻahaʻa o ka viscosity.

No laila, e hoʻemi ʻia ka hui ʻana o ka mortar ma muli o ka ikaika o waho, kahi mea e pono ai i ka ʻoki ʻana i ke kūkulu ʻana i ka palaki, i hiki ai i ka mortar ke hana maikaʻi a me ka cohesion i ka manawa like. Eia naʻe, e hōʻike ana ka solution cellulose ether i nā hiʻohiʻona wai o Newtonian i ka wā e haʻahaʻa loa ka ʻike a liʻiliʻi ka viscosity. Ke piʻi aʻe ka manaʻo, e hōʻike mālie ka hopena i nā ʻano wai pseudoplastic, a ʻoi aku ka kiʻekiʻe o ka ʻike, ʻoi aku ka maopopo o ka pseudoplasticity.