Ziziphi iimpawu ze-carboxymethyl cellulose?

Ziziphi iimpawu ze-carboxymethyl cellulose?

Impendulo:Carboxymethyl cellulosenayo ineempawu ezahlukeneyo ngenxa yamanqanaba awo ahlukeneyo okutshintsha. Iqondo lokufakela endaweni, ekwaziwa ngokuba yiqondo le-etherification, lithetha umndilili wenani le-H kumaqela amathathu e-OH hydroxyl endaweni yawo yi-CH2COONA. Xa amaqela amathathu e-hydroxyl kwindandatho esekwe kwi-cellulose ene-0.4 H kwiqela le-hydroxyl elithathelwe indawo yi-carboxymethyl, inokuchithwa emanzini. Ngeli xesha, ibizwa ngokuba yi-0.4 substitution degree okanye i-medium substitution degree (i-substitution degree 0.4-1.2) .

Iipropati ze-carboxymethyl cellulose:

1 Inokusasazwa kakuhle kunye namandla okubopha.

(2) Isisombululo saso samanzi sinokusetyenziswa njenge-emulsifier ye-oyile / uhlobo lwamanzi kunye namanzi / uhlobo lweoli. Ikwanesakhono sokuthambisa ioyile kunye newax, kwaye sisisihluzi esinamandla.

(3) Xa isisombululo sidibana neetyuwa ezinzima ezifana ne-acetate ye-lead, i-chloride ye-ferric, i-nitrate yesilivere, i-stannous chloride, kunye ne-potassium dichromate, imvula ingenzeka. Nangona kunjalo, ngaphandle kwe-acetate ye-lead, inokuphinda inyibilike kwisisombululo se-sodium hydroxide, kwaye i-precipitates efana ne-barium, isinyithi kunye ne-aluminium zinyibilika ngokulula kwi-1% yesisombululo se-ammonium hydroxide.

(4) Xa isisombululo sidibana ne-asidi ephilayo kunye nesisombululo se-asidi ye-inorganic, imvula ingenzeka. Ngokutsho kokuqwalaselwa, xa ixabiso le-pH liyi-2.5, i-turbidity kunye nemvula sele iqalile. Ngoko ke i-pH ye-2.5 inokuthathwa njengeyona nto ibalulekileyo.

(5) Kwiityuwa ezifana ne-calcium, i-magnesium kunye netyuwa yetafile, akukho mvula iya kwenzeka, kodwa i-viscosity kufuneka iyancipha, njengokongeza i-EDTA okanye i-phosphate kunye nezinye izinto zokuthintela.

(6) Ubushushu bunempembelelo enkulu kwi-viscosity yesisombululo sayo samanzi. I-viscosity iyancipha ngokuhambelanayo xa izinga lokushisa likhuphuka, kwaye ngokuphambene noko. Ukuzinza kwe-viscosity yesisombululo samanzi kwindawo yokushisa kwegumbi kuhlala kungatshintshi, kodwa i-viscosity inokuncipha ngokuthe ngcembe xa ishushu ngaphezu kwe-80 ° C ixesha elide. Ngokuqhelekileyo, xa iqondo lokushisa lingadluli i-110 ° C, nangona izinga lokushisa ligcinwa kwiiyure ezi-3, kwaye lipholile ukuya kuma-25 ° C, i-viscosity isabuyela kwisimo sayo sokuqala; kodwa xa iqondo lokushisa lifudumala ukuya kwi-120 ° C kwiiyure ze-2, nangona ukushisa kubuyiselwe, i-viscosity yehla nge-18.9%. .

(7) Ixabiso le-pH liya kuba nefuthe elithile kwi-viscosity yesisombululo sayo samanzi. Ngokuqhelekileyo, xa i-pH yesisombululo se-low-viscosity isuka ekungathathi hlangothi, i-viscosity yayo inesiphumo esincinci, ngelixa isisombululo se-medium-viscosity, ukuba i-pH yayo iyaphambuka ekungathathi hlangothi, i-viscosity iqala ukunciphisa ngokuthe ngcembe; ukuba i-pH yesisombululo esiphezulu se-viscosity iyaphambuka ekungathathi hlangothi, i-viscosity yayo iya kuncipha. Ukuhla ngokukhawuleza.

(8) Iyahambelana nezinye iiglues ezinyibilikayo emanzini, izinto ezithambileyo kunye nentlaka. Ngokomzekelo, iyahambelana neglue yezilwanyana, i-gum arabic, i-glycerin kunye nesitashi esinyibilikayo. Kwakhona iyahambelana neglasi yamanzi, i-polyvinyl alcohol, i-urea-formaldehyde resin, i-melamine-formaldehyde resin, njl., kodwa kwinqanaba elingaphantsi.

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(10) Kukho iindidi ezintathu ze-viscosity onokukhetha kuzo ngokwesicelo. Kwi-gypsum, sebenzisa i-viscosity ephakathi (2% isisombululo se-aqueous kwi-300-600mPa · s), ukuba ukhetha i-viscosity ephezulu (isisombululo se-1% kwi-2000mPa·s okanye ngaphezulu), ungayisebenzisa kwi-dosage kufuneka ithotywe ngokufanelekileyo.

(11) Isisombululo sayo samanzi sisebenza njenge-retarder kwi-gypsum.

(12) Iibhaktheriya kunye ne-microorganisms ayinayo impembelelo ecacileyo kwifom yayo ye powder, kodwa inefuthe kwisisombululo sayo samanzi. Emva kokungcola, i-viscosity iya kuhla kwaye i-mildew iya kubonakala. Ukongeza ubungakanani obufanelekileyo bezinto ezigcinayo kwangaphambili kunokugcina i-viscosity yayo kwaye ithintele ukungunda ixesha elide. Izilondolozo ezikhoyo zezi: I-BIT (1.2-benzisothiazolin-3-enye), i-racebendazim, i-thiram, i-chlorothalonil, njl njl. Isixa sereferensi yokongeza kwisisombululo se-aqueous yi-0.05% ukuya kwi-0.1%.

Isebenza kangakanani i-hydroxypropyl methylcellulose njenge-arhente yokugcina amanzi kwi-anhydrite binder?

Impendulo: I-Hydroxypropyl methylcellulose yi-agent ephezulu yokugcina amanzi kwi-gypsum cementitious materials. Ngokunyuka komxholo we-hydroxypropyl methylcellulose. Ukugcinwa kwamanzi kwe-gypsum cemented material yanda ngokukhawuleza. Xa kungekho arhente yokugcina amanzi eyongeziweyo, izinga lokugcinwa kwamanzi kwi-gypsum cemented material limalunga nama-68%. Xa inani le-arhente yokugcina amanzi li-0.15%, izinga lokugcinwa kwamanzi kwi-gypsum cemented material linokufikelela kwi-90.5%. Kwaye iimfuno zokugcina amanzi kwi-plaster ephantsi. I-dosage ye-ejenti yokugcina amanzi idlula i-0.2%, inyuse ngakumbi idosi, kwaye izinga lokugcinwa kwamanzi kwi-gypsum cementitious material linyuka ngokucothayo. Ukulungiswa kwezinto zokutyabeka i-anhydrite. Idosi efanelekileyo ye-hydroxypropyl methylcellulose yi-0.1% -0.15%.

Ziziphi iziphumo ezahlukeneyo zeselulosi ezahlukeneyo kwi-plaster yaseParis?

Impendulo: Zombini i-carboxymethyl cellulose kunye ne-methyl cellulose ingasetyenziselwa njengama-agent okugcina amanzi kwi-plaster ye-paris, kodwa umphumo wokugcina amanzi we-carboxymethyl cellulose ungaphantsi kakhulu kune-methyl cellulose, kunye ne-carboxymethyl cellulose iqulethe ityuwa ye-sodium, ngoko ifanelekile kwi-Plaster yaseParis inempembelelo yokunciphisa kwaye iyanciphisa amandla e-plaster.I-Methyl cellulosengumxube ofanelekileyo wezixhobo zesamente zegypsum ezidibanisa ukugcinwa kwamanzi, ukujiya, ukomelezwa, kunye ne-viscosifying, ngaphandle kokuba ezinye iintlobo zinefuthe elibambekayo xa ithamo lilikhulu. iphezulu kune-carboxymethyl cellulose. Ngesi sizathu, uninzi lwezixhobo ze-gypsum composite gelling zisebenzisa indlela yokudibanisa i-carboxymethyl cellulose kunye ne-methyl cellulose, ezingasebenzisi nje kuphela iimpawu zazo (ezifana nesiphumo sokubuyiswa kwe-carboxymethyl cellulose, isiphumo sokuqinisa i-methyl cellulose), kwaye zisebenzisa izibonelelo zazo eziqhelekileyo (ezifana nokugcina amanzi kunye nokuqina kwazo). Ngale ndlela, zombini ukugcinwa kwamanzi kwi-gypsum cementitious material kunye nokusebenza ngokubanzi kwe-gypsum cementitious material kunokuphuculwa, ngelixa ukunyuka kweendleko kugcinwa kwindawo ephantsi.