Menene halayen carboxymethyl cellulose?

Menene halayen carboxymethyl cellulose?

Amsa:cellulose na Carboxymethylkuma yana da halaye daban-daban saboda matakan maye gurbinsa daban-daban. Matsayin maye gurbin, wanda kuma aka sani da matakin etherification, yana nufin matsakaicin adadin H a cikin ƙungiyoyin OH hydroxyl guda uku da aka maye gurbinsu da CH2COONa. Lokacin da ƙungiyoyin hydroxyl guda uku akan zoben da ke tushen cellulose suna da 0.4 H a cikin rukunin hydroxyl da aka maye gurbinsu da carboxymethyl, ana iya narkar da shi a cikin ruwa. A wannan lokacin, ana kiransa digirin maye gurbin 0.4 ko matsakaicin digirin maye gurbin (digirin maye gurbin 0.4-1.2).

Abubuwan da ke cikin carboxymethyl cellulose:

(1) Farin foda ne (ko hatsi mai kauri, mai kama da fiber), ba shi da ɗanɗano, ba shi da lahani, yana narkewa cikin ruwa cikin sauƙi, kuma yana samar da siffa mai mannewa mai haske, kuma maganin yana da tsaka tsaki ko ɗan alkaline. Yana da kyakkyawan ƙarfin watsawa da ɗaurewa.

(2) Ana iya amfani da ruwan da ke cikinsa a matsayin mai tsarkakewa na nau'in mai/ruwa da kuma nau'in ruwa/mai. Hakanan yana da ikon tsarkakewa na mai da kakin zuma, kuma mai tsarkakewa ne mai ƙarfi.

(3) Idan maganin ya haɗu da gishirin ƙarfe mai nauyi kamar su lead acetate, ferric chloride, silver nitrate, stannous chloride, da potassium dichromate, ruwan sama na iya faruwa. Duk da haka, ban da lead acetate, har yanzu ana iya sake narkar da shi a cikin sodium hydroxide, kuma abubuwan da suka fashe kamar barium, iron da aluminum suna narkewa cikin sauƙi a cikin maganin ammonium hydroxide 1%.

(4) Idan ruwan ya haɗu da ruwan acid na halitta da ruwan acid na inorganic, ruwan sama na iya faruwa. A cewar abin da aka lura, lokacin da ƙimar pH ta kai 2.5, turbidity da ruwan sama sun fara. Saboda haka ana iya ɗaukar pH 2.5 a matsayin muhimmin batu.

(5) Ga gishiri kamar calcium, magnesium da gishirin tebur, ba za a sami ruwan sama ba, amma ya kamata a rage danko, kamar ƙara EDTA ko phosphate da sauran abubuwa don hana shi.

(6) Zafin jiki yana da tasiri sosai kan dankowar ruwan da ke cikinsa. Dankowar yana raguwa daidai lokacin da zafin jiki ya tashi, haka nan kuma akasin haka. Kwanciyar dankowar ruwan da ke cikinsa a zafin jiki na ɗaki ba ta canzawa ba, amma dankowar na iya raguwa a hankali lokacin da aka dumama shi sama da 80°C na dogon lokaci. Gabaɗaya, lokacin da zafin jiki bai wuce 110°C ba, koda kuwa zafin jiki ya ci gaba na tsawon awanni 3, sannan ya sanyaya zuwa 25°C, dankowar na iya komawa yadda yake a da; amma idan zafin ya kai 120°C na tsawon awanni 2, kodayake zafin ya dawo, dankowar na raguwa da kashi 18.9%.

(7) Darajar pH za ta kuma yi tasiri kan dankowar ruwan maganin da ke cikinsa. Gabaɗaya, lokacin da pH na ruwan maganin da ke da ƙarancin danko ya bambanta daga tsaka tsaki, dankowar sa ba ta da tasiri sosai, yayin da ga ruwan maganin da ke da matsakaicin danko, idan pH ɗinsa ya bambanta daga tsaka tsaki, dankowar sa ta fara raguwa a hankali; idan pH na ruwan maganin da ke da babban danko ya bambanta daga tsaka tsaki, dankowar sa zai ragu. Raguwa mai kaifi.

(8) Ya dace da sauran manne, masu laushi da resins masu narkewa cikin ruwa. Misali, ya dace da manne na dabbobi, gum arabic, glycerin da sitaci mai narkewa. Haka kuma ya dace da gilashin ruwa, polyvinyl alcohol, urea-formaldehyde resin, melamine-formaldehyde resin, da sauransu, amma a ƙaramin mataki.

(9) Fim ɗin da aka yi ta hanyar haskaka hasken ultraviolet na tsawon awanni 100 har yanzu ba shi da wani canji ko rauni.

(10) Akwai nau'ikan danko guda uku da za a zaɓa daga ciki bisa ga aikace-aikacen. Don gypsum, yi amfani da matsakaicin danko (maganin ruwa 2% a 300-600mPa·s), idan ka zaɓi babban danko (maganin 1% a 2000mPa·s ko fiye), za ka iya amfani da shi a cikin adadin da ya kamata a rage shi yadda ya kamata.

(11) Maganin ruwansa yana aiki azaman maganin hana gypsum.

(12) Bakteriya da ƙananan halittu ba su da wani tasiri a kan siffar foda, amma suna da tasiri a kan ruwan da ke cikinsa. Bayan gurɓatawa, ɗanɗanon zai ragu kuma ɗanɗanon zai bayyana. Ƙara adadin abubuwan kiyayewa da suka dace a gaba zai iya kiyaye ɗanɗanonsa kuma ya hana ɗanɗanon na dogon lokaci. Abubuwan kiyayewa da ake da su sune: BIT (1.2-benzisothiazolin-3-one), racebendazim, thiram, chlorothalonil, da sauransu. Adadin ƙarin da aka ambata a cikin ruwan shine 0.05% zuwa 0.1%.

Yaya tasirin hydroxypropyl methylcellulose yake a matsayin maganin riƙe ruwa ga mai ɗaure anhydrite?

Amsa: Hydroxypropyl methylcellulose wakili ne mai ƙarfi na riƙe ruwa ga kayan siminti na gypsum. Tare da ƙaruwar abun ciki na hydroxypropyl methylcellulose. Rike ruwa na kayan siminti na gypsum yana ƙaruwa da sauri. Idan ba a ƙara wakilin riƙe ruwa ba, ƙimar riƙe ruwa na kayan siminti na gypsum yana kusan kashi 68%. Idan adadin wakilin riƙe ruwa ya kai kashi 0.15%, ƙimar riƙe ruwa na kayan siminti na gypsum zai iya kaiwa kashi 90.5%. Kuma buƙatun riƙe ruwa na filastar ƙasa. Yawan wakilin riƙe ruwa ya wuce kashi 0.2%, yana ƙara yawan amfani, kuma ƙimar riƙe ruwa na kayan siminti na gypsum yana ƙaruwa a hankali. Shirya kayan siminti na anhydrite. Matsakaicin adadin hydroxypropyl methylcellulose shine kashi 0.1%-0.15%.

Menene tasirin cellulose daban-daban akan plaster of paris?

Amsa: Ana iya amfani da carboxymethyl cellulose da methyl cellulose a matsayin abubuwan riƙe ruwa ga plaster of paris, amma tasirin riƙe ruwa na carboxymethyl cellulose ya fi ƙasa da na methyl cellulose, kuma carboxymethyl cellulose yana ɗauke da gishirin sodium, don haka ya dace da Plaster of Paris yana da tasirin rage gudu kuma yana rage ƙarfin plaster.Methyl celluloseDaidaitaccen haɗin kayan siminti na gypsum wanda ya haɗa da riƙe ruwa, kauri, ƙarfafawa, da kuma viscosifying, sai dai wasu nau'ikan suna da tasirin ragewa idan adadin ya yi yawa. Ya fi carboxymethyl cellulose. Saboda wannan dalili, yawancin kayan gelling na gypsum composite suna amfani da hanyar haɗa carboxymethyl cellulose da methyl cellulose, waɗanda ba wai kawai suna nuna halayensu ba (kamar tasirin ragewa na carboxymethyl cellulose, tasirin ƙarfafawa na methyl cellulose), kuma suna ba da fa'idodinsu na gama gari (kamar riƙe ruwa da tasirin kauri). Ta wannan hanyar, ana iya inganta aikin riƙe ruwa na kayan siminti na gypsum da cikakken aikin kayan siminti na gypsum, yayin da ake kiyaye ƙarin farashi a mafi ƙanƙanta.