Ka hopena mānoanoa o ka hydroxypropyl methylcellulose

Hydroxypropyl methylcelluloseHPMChāʻawi i ka mortar pulu me ka viscosity maikaʻi loa, hiki ke hoʻonui nui i ka adhesion ma waena o ka mortar pulu a me ka papa kumu, a hoʻomaikaʻi i ka hana anti-sagging o ka mortar.i loko o ka hamo.ʻO ka hopena mānoanoa o ka cellulose ether hiki ke hoʻonui i ka homogeneity a me ka anti-dispersion hiki o nā mea hou cement-based, pale i ka delamination, segregation a me ke kahe ʻana o ka mortar a me ka paʻa, a hiki ke hoʻohana ʻia i loko o ka fiber-reinforced concrete, underwater concrete and self-compacting. kaʻa .

Hoʻonui ka Hydroxypropyl methylcellulose i ka viscosity o nā mea hana sima mai ka viscosity o ka solution cellulose ether.ʻO ka viscosity o ka cellulose ether solution e loiloi pinepine ʻia e ka index "viscosity".ʻO ka viscosity o cellulose ether ka mea maʻamau e pili ana i kahi ʻike (e like me ka 2%) o ka cellulose ether solution ma kahi mahana i ʻōlelo ʻia (e like me 20°C) a me ka ʻoki ʻoki ʻana ʻO ka waiwai viscosity i ana ʻia e kahi mea ana i kuhikuhi ʻia (e like me ka viscometer rotational) ma lalo o ke kūlana o ka wikiwiki (a i ʻole ka huli ʻana, e like me 20 rpm).

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 ka mea i hoʻokumu ʻia i ka sima, ʻoi aku ka maikaʻi o ka hoʻopili ʻana i ka substrate, ʻoi aku ka maikaʻi o ka anti-sagging a me ka anti-dispersing.He ikaika, akā inā nui loa kona viscosity, e hoʻopilikia ia i ka wai a me ka hana o nā mea hana sima (e like me ka hoʻopaʻa ʻana i nā pahi plastering i ka wā o ka hana ʻana 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 mīkini hoʻopaʻapaʻa ponoʻī a me ka paʻa paʻa ponoʻī e koi ana i ka wai kiʻekiʻe e 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, e hoʻonui ai i ka hua o ka mortar.

ʻO ka viscosity o ka hydroxypropyl methylcellulose solution e pili ana i kēia mau kumu:

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

1. ʻO ke kiʻekiʻe o ka polymerization o cellulose ether, ʻoi aku ka nui o ke kaumaha mole, a 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 solution aqueous, akā pono e uku ʻia i ke koho ʻana i ke ʻano kūpono i ka wā e hoʻohana ai, i mea e pale ai i ka nui o ka dosage a pili i ka hana o ka mortar. a me ke kaʻa;

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 ke kiʻekiʻe o ka cellulose ether, ʻoi aku ka nui o ka hopena o ka mahana;

4. He mau pseudoplastics ka hopena o ka cellulose ether me nā waiwai ʻāwīwī.ʻO ke kiʻekiʻe 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 hana o ka ikaika o waho, kahi mea e pono ai i ka ʻoki ʻana i ka hana ʻana o ka mortar, i hiki ai i ka mortar ke hana maikaʻi a me ka cohesion i ka manawa like.Eia naʻe, i ka wā e haʻahaʻa loa ai ka ʻike o ka cellulose ether solution a liʻiliʻi loa ka viscosity, e hōʻike ana ia i nā ʻano o ka wai Newtonian.Ke piʻi aʻe ka manaʻo, e hōʻike mālie ka hopena i nā ʻano o ka wai pseudoplastic, a ʻoi aku ka kiʻekiʻe o ka ʻike, ʻoi aku ka maopopo o ka pseudoplasticity.