Methyl Cellulose (MC) Inzira ya molekulari \ [C6H7O2 (OH) 3-h (OCH3) n1] x Ipamba itunganijwe ivurwa na alkali, naho methyl chloride ikoreshwa nka agent ya etherification. Nyuma yuruhererekane rwibisubizo, kuvura selile ya selile birakorwa. Mubisanzwe, urwego rwo gusimburwa ni 1.6 ~ 2.0, kandi urwego rwo gusimburwa ruratandukanye. Nibya non-ionic selulose ether.
1. Methylcellulose irashonga mumazi akonje, amazi ashyushye azahura ningorane, kandi pH urwego rwumuti wamazi urahagaze neza hagati ya 3/12. Ibinyamisogwe, guar gum nizindi surfactants nyinshi zirahuza. Gelation ibaho iyo ubushyuhe bugeze ku bushyuhe bwa gelation.
Kugumana amazi ya methylcellulose biterwa nubunini bwiyongereye, ubukonje, ubwiza bwikigereranyo nigipimo cyo gushonga. Mubisanzwe binini, bito, ubwiza bwinshi, kubika amazi menshi. Muri byo, gufata amazi bigira ingaruka zikomeye, kandi urwego rwijimye ntirugereranywa no gufata amazi. Igipimo cyo guseswa ahanini biterwa nurwego rwo guhindura isura ya selile ya selile hamwe nubwiza bwibice. Muri ethers ya selile yavuzwe haruguru, methyl selulose na hydroxypropyl methyl selulose ifite amazi menshi.
Imihindagurikire yubushyuhe irashobora kugira ingaruka zikomeye kububiko bwamazi ya methyl selile. - Ubushyuhe buri hejuru, niko gufata amazi ari bibi. Niba ubushyuhe bwa minisiteri burenze 40 ° C, kugumana amazi ya methyl selulose bizagabanuka cyane, bigira ingaruka zikomeye ku iyubakwa rya minisiteri.
Methylcellulose igira ingaruka zikomeye kumikorere no gufatira minisiteri. "Kwizirika" hano bivuga guhuza igikoresho cyabakozi basaba umukozi hamwe nurukuta rwurukuta, ni ukuvuga kurwanya ubukana bwa minisiteri. Viscosity, mortar shear strength, nimbaraga zisabwa nabakozi mukoresha nazo nini cyane, kandi kubaka minisiteri ntabwo ari byiza. Methylcellulose yubahirije urwego ruciriritse mubicuruzwa bya selile.
2. Hydroxypropyl methylcellulose (HPMC) [C 6 H 7 O 2 (OH) m-3 (m yiyongereye vuba. Ni selile idafite ionic ivanze na ether yateguwe nuruhererekane rwibisubizo nyuma yo kwangirika kwa alkali ya pamba itunganijwe, aho okiside ya propylene na methyl chloride ikoreshwa nkibikoresho bya etherification. Urwego rwo gusimburwa ni 1.2 / 2.0. Imiterere yacyo iratandukanye ukurikije igipimo cyibintu bya vitxyl hamwe na hydroxypropyl.
1. Hydroxypropyl methylcellulose igabanijwe mubwoko bushyushye kandi bwihuse. Ubushyuhe bwa gelation mumazi ashyushye buri hejuru cyane ugereranije na methylcellulose. Irerekana kandi iterambere ryinshi kuri methylcellulose iyo ishonga mumazi akonje.
Ubukonje bwa hydroxypropyl methylcellulose bufitanye isano n'uburemere bwa molekile, kandi uburemere bwa molekile ni bwinshi. Ubushyuhe nabwo bugira ingaruka ku bwenge bwabwo, uko ubushyuhe bwiyongera, ubukonje bugabanuka. Nyamara, ingaruka zubushyuhe kuri viscosity ziri munsi yubwa methyl selile. Igisubizo ni ububiko buhamye mubushyuhe bwicyumba.
3. Kugumana amazi ya hydroxypropyl methylcellulose biterwa nubwinshi bwiyongereye, ubukonje, nibindi, kandi igipimo cyo gufata amazi kingana nacyo kiri hejuru ya methyl selile.
4. Imikorere ya soda ya caustic namazi yindimu ntabwo igira uruhare runini, ariko alkali irashobora kwihutisha umuvuduko wacyo, kandi ubwiza bwiyongera. Hydroxypropyl methylcellulose ihamye kumunyu usanzwe, ariko iyo ubunini bwumuti wumunyu mwinshi, ubwiza bwumuti wa hydroxypropyl methylcellulose bikunda kwiyongera.
Hydroxypropyl methylcellulose irashobora kuvangwa na polymer zishonga amazi kugirango bibe igisubizo kimwe, cyinshi cyane. Nka alcool ya polyvinyl, ibinyamisogwe ether, amase y'imboga, nibindi.
Hydroxypropyl methylcellulose ifite enzyme nziza irwanya methylcellulose, amahirwe yo kwangirika kwimisemburo yumuti wacyo ni munsi ugereranije na methylcellulose, kandi guhuza hydroxypropylmethylcellulose mubwubatsi bwa minisiteri biruta ibya methylcellulose. Selulose.
Bitatu, hydroxyethyl selulose (HEC) ikozwe mu ipamba itunganijwe ivurwa na alkali, imbere ya acetone, na okiside ya Ethylene nka agent ya etherification. Urwego rwo gusimbuza ubusanzwe ni 1.5 / 2.0. Ifite hydrophilicity ikomeye kandi byoroshye gukuramo ubuhehere.
1. Hydroxyethyl selulose irashobora gushonga mumazi akonje, ariko biragoye gushonga mumazi ashyushye. Igisubizo gihamye mubushyuhe bwinshi kandi ntigifite imiterere ya gel. Irashobora gukoreshwa igihe kirekire muri minisiteri yubushyuhe bwo hejuru, ariko kugumana amazi yayo ni munsi ya methyl selile.
2. Hydroxyethyl selulose ihamye kuri aside rusange na alkali. Alkali yihutisha iseswa ryayo, kandi ububobere bwayo bwiyongera gato. Ikwirakwizwa ryayo mumazi ni mabi cyane ugereranije na methyl selulose na hydroxypropyl methyl selulose.
3.
4. Carboxymethyl selulose (CMC) \ selile ether. Urwego rwo gusimbuza muri rusange ni 0.4 / 1.4, kandi urwego rwo gusimburwa rufite ingaruka zikomeye kumikorere.
Carboxymethyl selulose ifite hygroscopique nyinshi, kandi mububiko rusange burimo amazi menshi.
2. Carboxymethyl selulose yumuti wamazi ntabwo itanga gel, ubukonje buragabanuka iyo ubushyuhe buzamutse, kandi ubukonje ntibusubira inyuma mugihe ubushyuhe burenze 50 ° C.
Guhagarara kwayo bigira ingaruka cyane kuri pH. Mubisanzwe bikoreshwa kuri gypsum mortar, ntabwo ikoreshwa na sima. Kubijyanye na alkaline nyinshi, bizatakaza ubukonje bwayo.
Kugumana amazi kwayo ni munsi cyane ugereranije na methyl selulose. Gypsum mortar ifite ingaruka zo kudindiza, kugabanya imbaraga. Ariko igiciro cya carboxymethyl selulose kiri hasi cyane ugereranije na methyl selile.
Igihe cyo kohereza: Mutarama-13-2023