Tasirin zafin jiki na yanayi akan iya aiki na cellulose ether modified gypsum

Ayyukan cellulose ether da aka gyara gypsum a yanayin yanayin yanayi daban-daban ya bambanta sosai, amma tsarinsa bai bayyana ba. An yi nazarin tasirin cellulose ether akan sigogi na rheological da kuma riƙe ruwa na gypsum slurry a yanayi daban-daban na yanayi. An auna diamita na hydrodynamic na ether cellulose a cikin ruwa lokaci ta hanyar hasken haske mai tsauri, kuma an bincika tsarin tasiri. Sakamakon ya nuna cewa ether cellulose yana da tasiri mai kyau na ruwa da kuma tasiri akan gypsum. Tare da haɓaka abun ciki na ether cellulose, danko na slurry yana ƙaruwa kuma ƙarfin riƙe ruwa yana ƙaruwa. Koyaya, tare da haɓakar zafin jiki, ƙarfin riƙewar ruwa na gypsum slurry da aka canza yana raguwa zuwa wani yanki, kuma sigogin rheological kuma suna canzawa. Yin la'akari da cewa ƙungiyar cellulose ether colloid za ta iya cimma ruwa ta hanyar toshe tashar sufuri na ruwa, yawan zafin jiki zai iya haifar da rushewar babban taro mai girma wanda aka samar da ether cellulose, don haka rage yawan ruwa da kuma aiki na gypsum da aka gyara.

Mabuɗin kalmomi:gypsum; Cellulose ether; Zazzabi; Riƙewar ruwa; rheology

0. Gabatarwa

Gypsum, a matsayin nau'i na kayan da ke da muhalli tare da kyakkyawan gini da kaddarorin jiki, ana amfani da su sosai a cikin ayyukan ado. A cikin aikace-aikacen tushen kayan gypsum, yawanci ana ƙara wakili mai riƙe da ruwa don gyara slurry don hana asarar ruwa a cikin tsarin hydration da hardening. Cellulose ether shine mafi yawan wakili mai riƙe da ruwa a halin yanzu. Domin ionic CE zai amsa da Ca2+, sau da yawa amfani da wadanda ba ionic CE, kamar: hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether da methyl cellulose ether. Yana da mahimmanci don nazarin kaddarorin gypsum cellulose ether da aka gyara don ingantaccen aikace-aikacen gypsum a cikin injiniyan kayan ado.

Cellulose ether wani babban fili ne na kwayoyin halitta da aka samar ta hanyar amsawar alkali cellulose da etherifying wakili a ƙarƙashin wasu yanayi. Nonionic cellulose ether da aka yi amfani da shi a cikin aikin injiniya na gine-gine yana da kyakkyawan tarwatsawa, riƙewar ruwa, haɗin kai da tasiri mai kauri. Bugu da ƙari na ether cellulose yana da tasiri mai tasiri a kan riƙewar ruwa na gypsum, amma lanƙwasawa da ƙarfin matsawa na gypsum taurara jiki kuma yana raguwa kadan tare da karuwar adadin kari. Wannan shi ne saboda cellulose ether yana da wani tasiri mai tasiri na iska, wanda zai gabatar da kumfa a cikin tsarin hadawa na slurry, don haka rage kayan aikin injiniya na jiki mai taurare. A lokaci guda, da yawa cellulose ether zai sa gypsum mix ma m, sakamakon da aikin yi.

Tsarin hydration na gypsum za a iya raba zuwa matakai hudu: narkar da calcium sulfate hemihydrate, crystallization nucleation na calcium sulfate dihydrate, girma na crystalline tsakiya da samuwar tsarin crystalline. A cikin tsarin hydration na gypsum, ƙungiyar aikin hydrophilic na cellulose ether adsorbing a saman ginshiƙan gypsum zai gyara wani ɓangare na kwayoyin ruwa, don haka jinkirta tsarin nucleation na gypsum hydration da kuma tsawaita lokacin saitin gypsum. Ta hanyar lura da SEM, Mroz ya gano cewa ko da yake kasancewar ether cellulose yana jinkirta ci gaban lu'ulu'u, amma ya karu da haɗuwa da haɗuwa da lu'ulu'u.

Cellulose ether yana ƙunshe da ƙungiyoyin hydrophilic don haka yana da wani nau'i na hydrophilicity, polymer dogon sarkar haɗin gwiwa tare da juna don yana da babban danko, hulɗar su biyu yana sa cellulose yana da tasiri mai zurfi na ruwa akan gypsum mix. Bulichen ya bayyana tsarin riƙe ruwa na ether cellulose a cikin siminti. A ƙananan hadawa, cellulose ether adsorb akan siminti don shayar da ruwa na intramolecular kuma tare da kumburi don cimma ruwa. A wannan lokacin, riƙewar ruwa ba shi da kyau. Babban sashi, ether cellulose zai samar da daruruwan nanometers zuwa wasu microns na colloidal polymer, yadda ya kamata ya toshe tsarin gel a cikin rami, don cimma ingantaccen ruwa. Hanyar aikin cellulose ether a cikin gypsum daidai yake da na siminti, amma mafi girma SO42- maida hankali a cikin yanayin ruwa na gypsum slurry zai raunana tasirin ruwa na cellulose.

Dangane da abin da ke sama, ana iya gano cewa bincike na yanzu akan cellulose ether modified gypsum galibi yana mai da hankali kan tsarin hydration na cellulose ether akan gypsum mix, abubuwan riƙewar ruwa, kaddarorin injina da microstructure na jikin taurare, da tsarin ether cellulose. rike ruwa. Koyaya, binciken kan hulɗar tsakanin ether cellulose da gypsum slurry a babban zafin jiki har yanzu bai isa ba. Cellulose ether bayani mai ruwa-ruwa zai gelatinize a wani takamaiman zafin jiki. Yayin da zafin jiki ya karu, dankon cellulose ether aqueous bayani zai ragu a hankali. Lokacin da yawan zafin jiki na gelatinization ya kai, ether cellulose za a haɗe shi cikin farin gel. Alal misali, a cikin aikin rani, yanayin zafin jiki yana da girma, halayen gel na thermal na cellulose ether suna daure don haifar da canje-canje a cikin aikin gypsum slurry da aka gyara. Wannan aikin yana bincika tasirin zafin zafin jiki akan aikin cellulose ether wanda aka gyara kayan gypsum ta hanyar gwaje-gwaje na tsari, kuma yana ba da jagora ga aikace-aikacen aikace-aikacen ether da aka gyara gypsum.

1. Gwaji

1.1 Raw Materials

Gypsum gypsum nau'in β-nau'in ginin halitta ne wanda Rukunin Gida na Ecological Home Group ke bayarwa.

Cellulose ether zaba daga Shandong Yiteng Group hydroxypropyl methyl cellulose ether, samfurin bayani dalla-dalla ga 75,000 mPa·s, 100,000 mPa·s da 200000mPa·s, gelation zafin jiki sama da 60 ℃. An zaɓi citric acid azaman gypsum retarder.

1.2 Gwajin Rheology

Kayan gwajin rheological da aka yi amfani da shi shine RST⁃CC rheometer wanda BROOKFIELD Amurka ya samar. Siffofin rheological kamar dankon filastik da yawan damuwa na gypsum slurry an ƙaddara su ta MBT⁃40F⁃0046 samfurin kwandon da CC3⁃40 rotor, kuma an sarrafa bayanan ta software RHE3000.

Halayen haɗin gypsum sun dace da halayen rheological na ruwa na Bingham, wanda yawanci ana nazarinsa ta amfani da ƙirar Bingham. Duk da haka, saboda pseudoplasticity na cellulose ether da aka ƙara zuwa polymer-gyara gypsum, slurry cakuda yawanci gabatar da wani karfi thinning dukiya. A wannan yanayin, ƙirar Bingham (M⁃B) da aka gyara zai iya bayyana mafi kyawun lanƙwasa na gypsum. Domin yin nazarin nakasar gypsum, wannan aikin kuma yana amfani da samfurin HerschelBulkley (H⁃B).

1.3 Gwajin riƙe ruwa

Hanyar gwaji koma zuwa GB/T28627⁃2012 Plastering Plaster. A lokacin gwaji tare da zafin jiki a matsayin mai canzawa, gypsum an riga an rigaya 1h a gaba a daidai zafin jiki a cikin tanda, kuma gaurayen ruwan da aka yi amfani da su a cikin gwajin an riga an rigaya 1h a cikin zafin jiki mai dacewa a cikin ruwan wanka na ruwa akai-akai, da kayan aiki da aka yi amfani da su. aka preheated.

1.4 Hydrodynamic diamita gwajin

A hydrodynamic diamita (D50) na HPMC polymer ƙungiyar a cikin ruwa lokaci da aka auna ta amfani da tsauri haske watsar da barbashi size analyzer (Malvern Zetasizer NanoZS90).

2. Sakamako da tattaunawa

2.1 Abubuwan Rheological na HPMC da aka gyara gypsum

Bayyanar danko shine rabon damuwa mai ƙarfi zuwa juzu'i da ke aiki akan ruwa kuma shine siga don siffanta kwararar ruwan da ba na Newtonian ba. Bayyanar danko na gypsum slurry da aka gyara ya canza tare da abun ciki na ether cellulose a ƙarƙashin ƙayyadaddun bayanai daban-daban guda uku (75000mPa·s, 100,000mpa · s da 200000mPa·s). Yanayin gwajin ya kasance 20 ℃. Lokacin da adadin shear na rheometer ya kasance 14min-1, ana iya gano cewa danko na gypsum slurry yana ƙaruwa tare da haɓakar haɗin gwiwar HPMC, kuma mafi girman danko na HPMC shine, mafi girman danko na gyaran gypsum slurry zai kasance. Wannan yana nuna cewa HPMC yana da tabbataccen kauri da tasirin viscosification akan gypsum slurry. Gypsum slurry da cellulose ether abubuwa ne tare da wani danko. A cikin gyare-gyaren gypsum mix, cellulose ether yana adsorbed a saman samfuran gypsum hydration, kuma hanyar sadarwar da aka kafa ta cellulose ether da cibiyar sadarwar da aka kafa ta hanyar gypsum mix suna haɗuwa, wanda ya haifar da "sakamako mai mahimmanci", wanda ke inganta ingantaccen danko na gaba ɗaya. gypsum tushen kayan da aka gyara.

Ƙunƙarar shear ⁃ matsananciyar damuwa na gypsum mai tsabta (G⁃H) da gypsum (G⁃H) da aka gyara tare da 75000mPa· s-HPMC, kamar yadda aka faɗo daga ƙirar Bingham (M⁃B) da aka bita. Ana iya gano cewa tare da haɓakar haɓakar ƙwayar cuta, ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar cuta ta karu. Ana samun dankowar filastik (ηp) da yawan ƙarfin ƙarfi (τ0) ƙimar gypsum mai tsafta da gypsum da aka gyara na HPMC a yanayin zafi daban-daban.

Daga filastik danko (ηp) da kuma samar da ƙarfi mai ƙarfi (τ0) dabi'u na gypsum mai tsabta da HPMC da aka gyara gypsum a yanayin zafi daban-daban, ana iya ganin cewa yawan damuwa na HPMC da aka gyara gypsum zai ragu ci gaba tare da karuwar zafin jiki, da yawan amfanin ƙasa. damuwa zai rage 33% a 60 ℃ idan aka kwatanta da 20 ℃. Ta hanyar lura da madaidaicin danko na filastik, ana iya gano cewa dankon filastik na gypsum slurry da aka gyara shima yana raguwa tare da karuwar zafin jiki. Duk da haka, yawan amfanin ƙasa danniya da filastik danko na tsarki gypsum slurry ƙara dan kadan tare da karuwa da zafin jiki, wanda ya nuna cewa canji na rheological sigogi na HPMC modified gypsum slurry a kan aiwatar da zafin jiki karuwa ne ya sa ta canji na HPMC Properties.

Ƙimar damuwa na gypsum slurry yana nuna matsakaicin ƙimar damuwa lokacin da slurry yayi tsayayya da nakasar shear. Mafi girman ƙimar damuwa na yawan amfanin ƙasa, mafi kwanciyar hankali da gypsum slurry zai iya zama. Dankowar filastik yana nuna ƙimar lalacewa na gypsum slurry. Mafi girman dankowar filastik shine, tsawon lokacin nakasar juzu'i na slurry zai kasance. A ƙarshe, sigogin rheological guda biyu na HPMC da aka gyara gypsum slurry suna raguwa a fili tare da haɓakar zafin jiki, kuma tasirin thickening na HPMC akan slurry gypsum ya raunana.

Nakasar juzu'i na slurry tana nufin kauri mai ƙarfi ko tasirin ɓacin rai wanda slurry ke nunawa lokacin da aka yi masa ƙarfi. Za'a iya yin hukunci da tasirin nakasawa na slurry ta hanyar pseudoplastic index n da aka samu daga madaidaicin madaidaicin. Lokacin da n <1, slurry na gypsum yana nuna raguwar ƙarfi, kuma ƙimar slurry na gypsum ya zama mafi girma tare da raguwar n. Lokacin da n> 1, slurry na gypsum ya nuna kauri mai ƙarfi, kuma ƙimar ƙarar gypsum slurry ya karu tare da karuwar n. Rheological curves na HPMC modified gypsum slurry a yanayi daban-daban dangane da HerschelBulkley (H⁃B) samfurin dacewa, don haka samun pseudoplastic index n na HPMC modified gypsum slurry.

Dangane da pseudoplastic index n na HPMC modified gypsum slurry, da ƙarfi nakasawa na gypsum slurry gauraye da HPMC ne karfi thinning, da kuma n darajar a hankali yana ƙaruwa tare da karuwar zafin jiki, wanda ke nuna cewa yanayin gypsum da aka gyara na HPMC zai inganta. a raunana zuwa wani matsayi lokacin da zafin jiki ya shafa.

Dangane da sauye-sauye na danko na gyare-gyare na gypsum slurry da aka ƙididdige su daga bayanan danniya na 75000 mPa · HPMC a yanayin zafi daban-daban, ana iya gano cewa danko na filastik na gypsum slurry da aka gyara yana raguwa da sauri tare da karuwa mai girma. wanda ke tabbatar da dacewa sakamakon samfurin H⁃B. slurry na gypsum da aka gyara ya nuna halayen ɓacin rai. Tare da haɓakar zafin jiki, bayyanar danko na cakuda yana raguwa zuwa wani matsayi a ƙananan ƙarancin ƙarfi, wanda ke nuna cewa tasirin raguwa na gypsum slurry da aka gyara ya raunana.

A cikin ainihin amfani da gypsum putty, ana buƙatar gypsum slurry don zama mai sauƙi don lalacewa a cikin tsarin shafa kuma ya kasance da kwanciyar hankali a hutawa, wanda ke buƙatar slurry na gypsum don samun kyawawan halaye masu laushi, kuma canjin shear na HPMC modified gypsum yana da wuya. wani nau'i na musamman, wanda ba shi da amfani ga gina kayan gypsum. Dankowar HPMC yana ɗaya daga cikin mahimman sigogi, kuma kuma babban dalilin da yasa yake taka rawar kauri don haɓaka halaye masu canzawa na haɗawa. Cellulose ether kanta yana da kaddarorin gel mai zafi, dankowar maganin ruwa yana raguwa sannu a hankali yayin da yawan zafin jiki ya karu, kuma farin gel yana haɓaka lokacin da ya kai ga zazzabi. Canjin rheological sigogi na cellulose ether modified gypsum tare da zafin jiki yana da dangantaka da canji na danko, saboda thickening sakamako ne sakamakon superposition na cellulose ether da gauraye slurry. A cikin aikin injiniya mai amfani, ya kamata a yi la'akari da tasirin zafin muhalli akan aikin HPMC. Alal misali, ya kamata a sarrafa zafin jiki na albarkatun kasa a cikin zafi mai zafi a lokacin rani don kauce wa rashin aikin aiki na gypsum da aka gyara wanda ya haifar da babban zafin jiki.

2.2 Riƙewar ruwa naHPMC ya canza gypsum

Riƙewar ruwa na gypsum slurry wanda aka gyara tare da ƙayyadaddun ƙayyadaddun abubuwa uku na ether cellulose an canza tare da madaidaicin sashi. Tare da karuwar adadin HPMC, yawan riƙe ruwa na gypsum slurry yana inganta sosai, kuma haɓakar haɓaka ya zama barga lokacin da adadin HPMC ya kai 0.3%. A ƙarshe, adadin riƙe ruwa na gypsum slurry yana da ƙarfi a 90% ~ 95%. Wannan yana nuna cewa HPMC yana da tasirin riƙe ruwa a fili akan manna dutse, amma tasirin riƙe ruwa bai inganta sosai ba yayin da adadin ke ci gaba da ƙaruwa. Ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ruwa na HPMC ba su da girma, misali, lokacin da abun ciki ya kasance 0.3%, yawan adadin ruwa shine 5%, ma'auni na daidaitattun 2.2. HPMC tare da mafi girman danko ba shine mafi girman adadin ruwa ba, kuma HPMC tare da mafi ƙarancin danko ba shine mafi ƙarancin adadin ruwa ba. Koyaya, idan aka kwatanta da gypsum mai tsafta, adadin riƙewar ruwa na HPMC guda uku don gypsum slurry yana haɓaka sosai, kuma yawan riƙe ruwa na gypsum da aka gyara a cikin abun ciki na 0.3% yana ƙaruwa da 95%, 106%, 97% idan aka kwatanta da ƙungiyar kulawa mara kyau. Cellulose ether a fili na iya inganta riƙe ruwa na gypsum slurry. Tare da haɓakar abun ciki na HPMC, ƙimar riƙe ruwa na HPMC da aka gyara gypsum slurry tare da danko daban-daban a hankali ya kai matakin jikewa. 10000mPa·sHPMC ya kai matsayin jikewa a 0.3%, 75000mPa·s da 20000mPa·s HPMC sun kai matakin jikewa a 0.2%. Sakamakon ya nuna cewa riƙewar ruwa na 75000mPa·s HPMC da aka gyara gypsum yana canzawa tare da zafin jiki a ƙarƙashin nau'i daban-daban. Tare da raguwar zafin jiki, ƙimar riƙewar ruwa na HPMC da aka gyara gypsum a hankali yana raguwa, yayin da adadin riƙe ruwa na gypsum mai tsabta ya kasance ba canzawa ba, yana nuna cewa karuwar zafin jiki yana raunana tasirin ruwa na HPMC akan gypsum. Adadin riƙe ruwa na HPMC ya ragu da 31.5% lokacin da zafin jiki ya ƙaru daga 20 ℃ zuwa 40 ℃. Lokacin da zafin jiki ya tashi daga 40 ℃ zuwa 60 ℃, yawan riƙe ruwa na HPMC modified gypsum daidai yake da na gypsum mai tsabta, yana nuna cewa HPMC ya rasa tasirin inganta riƙewar gypsum a wannan lokacin. Jian Jian da Wang Peiming sun ba da shawarar cewa cellulose ether da kanta yana da yanayin gel mai zafi, canjin zafin jiki zai haifar da canje-canje a cikin danko, ilimin halittar jiki da adsorption na ether cellulose, wanda zai haifar da canje-canje a cikin aikin slurry mix. Har ila yau Bulichen ya gano cewa danko mai ƙarfi na maganin siminti mai ɗauke da HPMC ya ragu tare da ƙara yawan zafin jiki.

Canjin riƙewar ruwa na cakuda da ke haifar da karuwar zafin jiki ya kamata a hade tare da tsarin ether cellulose. Bulichen ya bayyana tsarin da ether cellulose zai iya riƙe ruwa a cikin siminti. A cikin tsarin tushen siminti, HPMC yana haɓaka ƙimar riƙe ruwa na slurry ta rage haɓakar “cake tace” da tsarin siminti ya kafa. Wani maida hankali na HPMC a cikin ruwa lokaci zai samar da dama ɗari nanometers zuwa 'yan microns na colloidal kungiyar, wannan yana da wani takamaiman girma na polymer tsarin iya yadda ya kamata toshe ruwa watsa tashar a cikin mix, rage permeability na "filter cake", don cimma ingantaccen kiyaye ruwa. Bulichen kuma ya nuna cewa HPMCS a cikin gypsum yana nuna wannan inji. Sabili da haka, nazarin diamita na hydromechanical na ƙungiyar da HPMC ta kafa a cikin ruwa lokaci zai iya bayyana tasirin HPMC akan riƙe ruwa na gypsum.

2.3 Hydrodynamic diamita na ƙungiyar HPMC colloid

Barbashi rarraba masu lankwasa na daban-daban yawa na 75000mPa · s HPMC a cikin ruwa lokaci, da kuma barbashi rarraba masu lankwasa uku dalla-dalla na HPMC a cikin ruwa lokaci a taro na 0.6%. Ana iya gani daga barbashi rarraba kwana na HPMC na uku bayani dalla-dalla a cikin ruwa lokaci a lokacin da maida hankali ne 0.6% cewa, tare da karuwa da HPMC taro, da barbashi size na hade mahadi kafa a cikin ruwa lokaci kuma yana ƙaruwa. Lokacin da maida hankali ya yi ƙasa, barbashi da aka kafa ta tarawar HPMC ƙanana ne, kuma ƙaramin ɓangaren HPMC ne kawai ke haɗawa zuwa barbashi na kusan 100nm. Lokacin da maida hankali na HPMC ya kasance 1%, akwai adadi mai yawa na ƙungiyoyin colloidal tare da diamita na hydrodynamic na kusan 300nm, wanda shine muhimmiyar alamar haɗuwa da kwayoyin halitta. Wannan "babban girma" tsarin polymerization na iya yadda ya kamata ya toshe tashar watsa ruwa a cikin mahaɗin, rage "permeability na cake", da kuma daidaitaccen ruwa na gypsum mix a wannan taro kuma ya fi 90%. The hydromechanical diameters na HPMC tare da daban-daban danko a cikin ruwa lokaci ne m guda, wanda ya bayyana irin wannan ruwa riƙe kudi na HPMC modified gypsum slurry tare da daban-daban viscosities.

Barbashi girman rabo masu lankwasa na 75000mPa·s HPMC tare da 1% maida hankali a yanayin zafi daban-daban. Tare da karuwar zafin jiki, za'a iya samun bazuwar ƙungiyar colloidal HPMC. A 40 ℃, babban ƙarar ƙungiyar 300nm gaba ɗaya ya ɓace kuma ya bazu cikin ƙananan ƙaramar ƙarar 15nm. Tare da ƙarin haɓakar zafin jiki, HPMC ya zama ƙananan ƙwayoyin cuta, kuma riƙewar ruwa na gypsum slurry ya ɓace gaba ɗaya.

A sabon abu na HPMC Properties canza tare da Yunƙurin zafin jiki ne kuma aka sani da zafi gel Properties, data kasance na kowa ra'ayi shi ne cewa a wani low zafin jiki, HPMC macromolecules farko tarwatsa a cikin ruwa don narkar da bayani, HPMC kwayoyin a high maida hankali zai samar da babban barbashi ƙungiya. . Lokacin da zafin jiki ya tashi, hydration na HPMC ya raunana, ruwan da ke tsakanin sarƙoƙi yana raguwa sannu a hankali, manyan mahadi na ƙungiyoyi suna tarwatsewa a hankali cikin ƙananan ƙwayoyin cuta, dankon maganin yana raguwa, kuma tsarin cibiyar sadarwa mai girma uku yana samuwa lokacin da gelation. zafin jiki ya kai, kuma farin gel ɗin yana haɗe.

Bodvik ya gano cewa microstructure da adsorption Properties na HPMC a cikin ruwa lokaci an canza. Haɗe da ka'idar Bulichen na ƙungiyar HPMC colloidal ta toshe tashar sufurin ruwa mai slurry, an kammala cewa karuwar zafin jiki ya haifar da rushewar ƙungiyar colloidal HPMC, wanda ya haifar da raguwar riƙe ruwa na gypsum da aka gyara.

3. Kammalawa

(1) Cellulose ether kanta yana da babban danko da kuma "superimposed" sakamako tare da gypsum slurry, wasa wani fili thickening sakamako. A cikin zafin jiki na dakin, tasirin thickening ya zama mafi bayyane tare da haɓakar danko da sashi na ether cellulose. Duk da haka, tare da karuwar zafin jiki, danko na ether cellulose yana raguwa, tasirinsa yana raunana, yawan yawan damuwa da kuma dankon filastik na gypsum mix ya ragu, pseudoplasticity yana raunana, kuma kayan gini ya zama mafi muni.

(2) Cellulose ether ya inganta riƙewar ruwa na gypsum, amma tare da karuwar zafin jiki, riƙewar ruwa na gypsum gyare-gyare kuma ya ragu sosai, har ma a 60 ℃ zai rasa tasirin riƙewar ruwa gaba ɗaya. Adadin ajiyar ruwa na slurry na gypsum an inganta shi sosai ta hanyar ether cellulose, kuma yawan riƙewar ruwa na HPMC da aka gyara gypsum slurry tare da danko daban-daban a hankali ya kai matsayin jikewa tare da karuwar sashi. Riƙewar ruwan gypsum gabaɗaya ya yi daidai da ɗankowar ether ɗin cellulose, a babban danko yana da ɗan tasiri.

(3) Abubuwan da ke cikin ciki waɗanda ke canza riƙewar ruwa na cellulose ether tare da zafin jiki suna da alaka da ƙananan ƙwayoyin cuta na cellulose ether a cikin ruwa lokaci. A wani taro mai mahimmanci, ether cellulose yana kula da haɗuwa don samar da ƙungiyoyi masu girma na colloidal, yana toshe tashar jigilar ruwa na cakuda gypsum don cimma babban riƙewar ruwa. Duk da haka, tare da karuwar yawan zafin jiki, saboda kayan haɓakar thermal gelation na cellulose ether kanta, babban ƙungiyar colloid da aka kafa a baya ya sake bazuwa, yana haifar da raguwar aikin riƙe ruwa.