Lintho tsa carboxymethyl cellulose ke life?

Lintho tsa carboxymethyl cellulose ke life?

Karabo:Carboxymethyl cellulosee boetse e na le thepa e fapaneng ka lebaka la likhato tsa eona tse fapaneng tsa ho nka sebaka. Tekanyo ya phapanyetso, eo hape e tsejwang e le tekanyo ya etherification, e bolela palo e tlwaelehileng ya H ho dihlopha tse tharo tsa OH hydroxyl tse nketsweng sebaka ke CH2COONA. Ha lihlopha tse tharo tsa hydroxyl tse selikalikoeng tse thehiloeng ho cellulose li na le 0.4 H sehlopheng sa hydroxyl se nkeloang sebaka ke carboxymethyl, e ka qhibiliha ka metsing. Ka nako ena, e bitsoa 0.4 substitution degree kapa medium substitution degree (substitution degree 0.4-1.2).

Lintho tse molemo tsa carboxymethyl cellulose:

(1) Ke phofo e tšoeu (kapa lijo-thollo tse mahoashe, fiber), ha e na tatso, ha e na kotsi, e qhibiliha ha bonolo metsing, 'me e etsa sebopeho sa ho khomarela se hlakileng, 'me tharollo ha e nke lehlakore kapa e na le alkaline hanyenyane. E na le phallo e ntle le matla a tlamang.

(2) Tharollo ea eona ea metsi e ka sebelisoa e le emulsifier ea mofuta oa oli / metsi le mofuta oa metsi / oli. E boetse e na le matla a emulsifying bakeng sa oli le boka, 'me ke emulsifier e matla.

(3) Ha tharollo e kopana le letsoai la tšepe e boima joalo ka lead acetate, ferric chloride, silver nitrate, stannous chloride, le potassium dichromate, pula e ka ba teng. Leha ho le joalo, ntle le acetate ea lead, e ntse e ka qhibiliha hape ka tharollo ea sodium hydroxide, 'me metsi a kang barium, tšepe le aluminium a qhibiliha habonolo ka tharollo ea 1% ea ammonium hydroxide.

(4) Ha tharollo e kopana le organic acid le inorganic acid tharollo, pula e ka ba teng. Ho latela tlhokomeliso, ha boleng ba pH e le 2.5, moferefere le lipula li qalile. Kahoo pH 2.5 e ka nkoa e le ntlha ea bohlokoa.

(5) Bakeng sa matsoai a kang calcium, magnesium le letsoai la tafole, ha ho na pula e tla ba teng, empa viscosity e lokela ho fokotseha, joalo ka ho eketsa EDTA kapa phosphate le lintho tse ling ho e thibela.

(6) Mocheso o na le tšusumetso e kholo ho viscosity ea tharollo ea eona ea metsi. Viscosity e fokotseha ka tsela e tšoanang ha mocheso o phahama, le ka tsela e fapaneng. Ho tsitsa ha viscosity ea tharollo ea metsi ka mocheso oa kamore ho lula ho sa fetohe, empa viscosity e ka fokotseha butle-butle ha e futhumala ka holimo ho 80 ° C ka nako e telele. Ka kakaretso, ha mocheso o sa fete 110 ° C, esita le haeba mocheso o bolokiloe lihora tse 3, ebe o pholile ho 25 ° C, viscosity e ntse e khutlela boemong ba eona ba pele; empa ha mocheso o futhumala ho 120 ° C ka lihora tse 2, le hoja mocheso o tsosolositsoe, viscosity e theoha ka 18,9%. .

(7) Boleng ba pH le bona bo tla ba le tšusumetso e itseng ho viscosity ea tharollo ea eona ea metsi. Ka kakaretso, ha pH ea tharollo e tlaase ea viscosity e kheloha ho se nke lehlakore, viscosity ea eona ha e na phello e fokolang, athe bakeng sa tharollo ea li-medium-viscosity, haeba pH ea eona e kheloha ho se nke lehlakore, viscosity e qala ho fokotseha butle-butle; haeba pH ea tharollo e phahameng ea viscosity e kheloha ho se nke lehlakore, viscosity ea eona e tla fokotseha. Ho fokotseha ho hoholo.

(8) E lumellana le likhomaretsi tse ling tse qhibilihang ka metsing, li-softeners le li-resin. Ka mohlala, e lumellana le sekhomaretsi sa liphoofolo, gum arabic, glycerin le starch e qhibilihang. E boetse e lumellana le khalase ea metsi, joala ea polyvinyl, resin ea urea-formaldehyde, resin ea melamine-formaldehyde, joalo-joalo, empa ka tekanyo e fokolang.

(9) Filimi e entsoeng ka ho khantša lebone la ultraviolet ka lihora tse 100 e ntse e se na mebala kapa ho senyeha.

(10) Ho na le mefuta e meraro ea viscosity eo u ka khethang ho eona ho latela kopo. Bakeng sa gypsum, sebelisa viscosity e bohareng (2% aqueous solution ho 300-600mPa·s), haeba u khetha viscosity e phahameng (1% tharollo ho 2000mPa·s kapa ho feta), u ka e sebelisa ka tekanyo e lokela ho theoleloa ka tsela e nepahetseng.

(11) Tharollo ea eona ea metsi e sebetsa e le retarder ka gypsum.

(12) Libaktheria le likokoana-hloko ha li na phello e totobetseng ka foromo ea eona ea phofo, empa li na le phello ho tharollo ea eona ea metsi. Ka mor'a tšilafalo, viscosity e tla theoha 'me hlobo e tla hlaha. Ho eketsa palo e loketseng ea li-preservatives esale pele ho ka boloka viscosity ea eona le ho thibela hlobo ka nako e telele. Li-preservatives tse fumanehang ke: BIT (1.2-benzisothiazolin-3-one), racebendazim, thiram, chlorothalonil, joalo-joalo. Chelete ea kenyelletso ea litšupiso tharollong ea metsi ke 0.05% ho isa ho 0.1%.

Hydroxypropyl methylcellulose e sebetsa hakae e le ntho e bolokang metsi bakeng sa anhydrite binder?

Karabo: Hydroxypropyl methylcellulose ke sesebelisoa sa ho boloka metsi se sebetsang hantle haholo bakeng sa lisebelisoa tsa gypsum cementitious. Ka keketseho ea litaba tsa hydroxypropyl methylcellulose. Ho boloka metsi a gypsum cemented material e eketseha ka potlako. Ha ho se na moemeli oa ho boloka metsi o eketsoang, sekhahla sa ho boloka metsi sa thepa e entsoeng ka gypsum se ka ba 68%. Ha palo ea sesebelisoa sa ho boloka metsi e le 0.15%, tekanyo ea ho boloka metsi ea thepa e entsoeng ka gypsum e ka fihla ho 90.5%. Le litlhoko tsa ho boloka metsi tsa samente e tlase. Tekanyo ea sesebelisoa se bolokang metsi e feta 0.2%, e eketsa litekanyetso, 'me sekhahla sa ho boloka metsi sa gypsum cementitious material se eketseha butle. Ho lokisoa ha lisebelisoa tsa plastering tsa anhydrite. Tekanyetso e loketseng ea hydroxypropyl methylcellulose ke 0.1% -0.15%.

Liphello tse fapaneng tsa selulose ho samente ea Paris ke life?

Karabo: Ka bobeli carboxymethyl cellulose le methyl cellulose li ka sebelisoa e le lisebelisoa tse bolokang metsi bakeng sa plaster ea paris, empa phello ea ho boloka metsi ea carboxymethyl cellulose e tlase haholo ho feta ea methyl cellulose, 'me carboxymethyl cellulose e na le letsoai la sodium, kahoo e loketse bakeng sa Plaster ea Paris e na le phello e fokolang le ho fokotsa matla a plaster.Methyl celluloseke motsoako o loketseng bakeng sa lisebelisoa tsa gypsum cementitious tse kopanyang ho boloka metsi, ho teteaneng, ho matlafatsa le ho etsa viscosifying, ntle le hore mefuta e meng e na le phello e fokolang ha tekanyo e le khōlō. e phahameng ho feta carboxymethyl cellulose. Ka lebaka lena, lisebelisoa tse ngata tsa gypsum composite gelling li sebelisa mokhoa oa ho kopanya carboxymethyl cellulose le methyl cellulose, tse sa sebeliseng litšobotsi tsa tsona feela (tse kang phello e fokolang ea carboxymethyl cellulose, phello e matlafatsang ea methyl cellulose), le ho sebelisa melemo ea bona e tloaelehileng (e kang ho boloka metsi le ho teteana). Ka tsela ena, ts'ebetso ea ho boloka metsi ea lisebelisoa tsa gypsum cementitious le ts'ebetso e felletseng ea lisebelisoa tsa gypsum cementitious li ka ntlafatsoa, ​​athe keketseho ea litšenyehelo e ntse e le tlase haholo.