Waa maxay sifooyinka carboxymethyl cellulose?

Waa maxay sifooyinka carboxymethyl cellulose?

Jawaab:Carboxymethyl cellulosesidoo kale waxay leedahay hantiyo kala duwan sababtoo ah heerarkeeda kala duwan ee beddelka. Heerka beddelka, oo sidoo kale loo yaqaan heerka etherification, macnaheedu waa celceliska tirada H ee saddexda kooxood ee OH hydroxyl ee lagu beddelay CH2COONa. Marka saddexda kooxood ee hydroxyl ee giraanta ku salaysan cellulose ay leeyihiin 0.4 H ee kooxda hydroxyl ee lagu beddelay karboxymethyl, waxaa lagu milmi karaa biyo. Waqtigaan, waxaa loo yaqaan 0.4 beddelka shahaadada ama shahaadada beddelka dhexdhexaadka ah (shahaadada beddelka 0.4-1.2) .

Astaamaha karboxymethyl cellulose:

(1) Waa budo cad (ama hadhuudh aan dhab ahayn, fibros ah), aan dhadhamin, aan waxyeello lahayn, si fudud biyaha ugu milmi kara, waxayna samaysaa qaab dhegdheg ah oo hufan, xalkuna waa dhexdhexaad ama waxoogaa alkaline ah. Waxay leedahay kala firdhis wanaagsan iyo awood xidhidh.

(2) Xalka aqueous waxaa loo isticmaali karaa sidii emulsifier ee nooca saliidda / biyaha iyo nooca biyaha / saliidda. Waxa kale oo ay leedahay awoodda emulsifier ee saliidda iyo dhuka, waana emulsifier xooggan.

(3) Marka xalku la kulmo cusbada birta culus sida acetate rasaasta, ferric chloride, nitrate silver, chloride stannous, iyo potassium dichromate, roobab ayaa dhici kara. Si kastaba ha ahaatee, marka laga reebo acetate sunta rasaasta, waxay wali dib u milmi kartaa xalalka sodium hydroxide, iyo roobabka sida barium, birta iyo aluminiumku waxay si fudud u milmi karaan 1% ammonium hydroxide.

(4) Marka xalku la kulmo aashitada organic iyo xalalka aashitada inorganic, roobab ayaa dhici kara. Marka loo eego kormeerka, marka qiimaha pH uu yahay 2.5, turbidity iyo roobab ayaa bilaabay. Sidaa darteed pH 2.5 waxaa loo tixgelin karaa inay tahay barta muhiimka ah.

(5) Cusbada sida kaalshiyamka, magnesium iyo milixda miiska, wax roob ahi ma dhacayo, laakiin waa in la yareeyaa viscosity, sida in lagu daro EDTA ama fosfatetada iyo walxaha kale si looga hortago.

(6) Heerkulka ayaa saameyn weyn ku leh viscosity ee xalkeeda aqueous. Viscosity-ku si u dhigma ayuu hoos u dhacaa marka heerkulku kor u kaco, iyo beddelkeeda. Degganaanshaha viscosity ee xalka aqueous ee heerkulka qolka ayaa weli ah mid aan isbeddelin, laakiin mawqifku si tartiib tartiib ah ayuu u yaraan karaa marka lagu kululeeyo 80 ° C muddo dheer. Guud ahaan, marka heerkulku aanu ka badnayn 110 ° C, xitaa haddii heerkulka la ilaaliyo 3 saacadood, ka dibna la qaboojiyo 25 ° C, viscosity weli wuxuu ku soo noqdaa sidii hore; laakiin marka heerkulku la kululeeyo ilaa 120°C muddo 2 saacadood ah, in kasta oo heerkulku dib loo soo celiyay, viscosity-gu wuxuu hoos u dhacayaa 18.9%. .

(7) Qiimaha pH sidoo kale wuxuu yeelan doonaa saameyn gaar ah viscosity ee xalkeeda aqueous. Guud ahaan, marka pH ee xalka hoose ee viscosity-ka uu ka leexdo dhexdhexaadka, mawduuciisu wuxuu leeyahay saameyn yar, halka xalka dhexdhexaadka ah, haddii pH ay ka leexato dhexdhexaad, mawaadinku wuxuu bilaabaa inuu si tartiib tartiib ah hoos u dhaco; haddii pH ee xalka viscosity-ga sare uu ka leexdo dhexdhexaad, mawduuciisu wuu yaraan doonaa. Hoos u dhac xooggan.

(8) La jaanqaadi kara xabagyada kale ee biyaha ku milma, jilciya iyo xabagta. Tusaale ahaan, waxay ku habboon tahay xabagta xayawaanka, cirridka carabiga, glycerin iyo istaarijka milmay. Waxa kale oo ay ku habboon tahay galaaska biyaha, alkolada polyvinyl, urea-formaldehyde resin, melamine-formaldehyde resin, iwm, laakiin si ka yar.

(9) Filimkii lagu sameeyay 100 saacadood ee iftiinka ultraviolet-ka lagu sameeyay wali ma laha midab ama jajab.

(10) Waxaa jira saddex nooc oo viscosity ah oo laga dooran karo iyadoo loo eegayo arjiga. Gypsumka, isticmaal viscosity dhexdhexaad ah (2% xal aqueous at 300-600mPa·s), haddii aad doorato viscosity sare (1% xal at 2000mPa·s ama ka badan), waxaad u isticmaali kartaa in qiyaasta waa in si habboon hoos loo dhigo.

(11) Xalka aqueous wuxuu u shaqeeyaa sidii dib-u-dejin gypsum ah.

(12) Bakteeriyada iyo noolaha wax saameyn ah kuma laha qaabka budada, laakiin waxay saameyn ku leeyihiin xalkeeda biyaha. Wasakhda ka dib, viscosity-ku wuu soo dhacayaa oo caariyaysi ayaa soo baxaya. Ku darida qadar ku habboon oo ah waxyaalaha lagu ilaaliyo horeba waxay ilaalin kartaa viscosity-keeda waxayna ka hortagtaa caariyaysi muddo dheer. Waxyaabaha ilaaliya ee la heli karo waa: BIT (1.2-benzisothiazolin-3-one), racebendazim, thiram, chlorothalonil, iwm. Qadarka tixraaca ee lagu daro xalka aqueous waa 0.05% ilaa 0.1%.

Sidee bay waxtar u tahay hydroxypropyl methylcellulose sida wakiilka biyaha celiya ee xiraha anhydrite?

Jawaab: Hydroxypropyl methylcellulose waa wax-ku-ool badan oo biyo-haynta walxaha gypsum-ka ah. Iyadoo kororka maadada hydroxypropyl methylcellulose. Haysashada biyaha ee walxaha sibidhka gypsum ayaa si degdeg ah u kordha. Marka aan lagu darin wax biyo-hayn ah, heerka haynta biyaha ee walxaha sibidhka gypsum waa qiyaastii 68%. Marka qadarka wakiilka biyaha haynta yahay 0.15%, heerka haynta biyaha ee gypsum cemented wuxuu gaari karaa 90.5%. Iyo shuruudaha haynta biyaha ee malaasta hoose. Qiyaasta wakiilka biyaha haynta ayaa ka badan 0.2%, sii kordhinta qiyaasta, iyo xajinta biyaha ee alaabta cementious gypsum ayaa si tartiib ah u kordheysa. Diyaarinta walxaha malaasta anhydrite. Qiyaasta ku habboon ee hydroxypropyl methylcellulose waa 0.1% -0.15%.

Waa maxay saamaynta kala duwan ee cellulose kala duwan ee malaasta paris?

Jawaab: Carboxymethyl cellulose iyo methyl cellulose labadaba waxaa loo isticmaali karaa sida wakiilada biyaha haynta ee plaster of paris, laakiin saamaynta biyaha-haysta ee karboxymethyl cellulose aad ayuu uga hooseeyaa kan methyl cellulose, iyo carboxymethyl cellulose ka kooban yahay cusbada sodium, sidaas darteed waa ku haboon Plaster of Paris waxay leedahay saamayn dib u dhigis iyo yaraynaysaa xoogga malaasta.Methyl cellulosewaa isku-dar ku habboon walxaha sibidhka gypsum ee isku-dhafan haynta biyaha, dhumucda, xoojinta, iyo viscosifying, marka laga reebo in noocyada qaar ay leeyihiin saamayn dib u dhac ah marka qiyaastu weyn tahay. ka sarreeya karboxymethyl cellulose. Sababtan awgeed, inta badan qalabka gypsum composite gelling waxay qaataan habka isku-darka carboxymethyl cellulose iyo methyl cellulose, kuwaas oo aan kaliya fulin sifooyinkooda (sida saamaynta dib u dhigista karboxymethyl cellulose, saamaynta xoojinta methyl cellulose), oo ay sameeyaan faa'iidooyinkooda caadiga ah (sida haynta biyaha iyo saamaynta dhumucda). Sidan oo kale, labadaba waxqabadka biyaha ee gypsum cementity gypsum iyo waxqabadka dhamaystiran ee alaabta cementious gypsum waa la hagaajin karaa, iyada oo kharashka korodhka lagu hayo meesha ugu hooseeya.