Hydroxypyl methylcellose (hpmc)Tsarin ruwa ne mai narkewa da ruwa sosai a cikin gini, magani, abinci da masana'antar sunadarai. Halittar ce mai samar da sel ba ta da ethululose da aka samo ta hanyar siginar sinadarai na kwayar halitta, tare da kyakkyawar thickening, emulsification, kaddarorin samar da fim. Koyaya, a ƙarƙashin yanayin zazzabi, HPMC zai sa lalata yanayin zafi, wanda ke da tasiri mai mahimmanci akan kwanciyar hankali da aikin aikace-aikace.
Tsarin lalata yanayin hpmc
Rashin lalata na HPMC yafi haɗa canje-canje na zahiri da canje-canje na sunadarai. Canje-canje na zahiri ana bayyana akasarin yadda aka bayyana shi azaman ruwa, raguwar gilashin da tsarin sunadarai da tsarin sarrafawa da tsarin cleavage da tsarin cleavage.
1. Lowarancin matakin zazzabi (100-200 ° C): cirewa ruwa da bazuwar farko
A karkashin yanayin ƙarancin zafin jiki (kusan 100 ° C), HPMC galibi ana fama da cututtukan ruwa da canjin gilashin. Tun da HPMC ya ƙunshi wasu adadin ruwa da aka ɗaure, wannan ruwa zai ƙafe lokacin dumama, don haka ya shafi kaddarorin ƙwararrun abubuwa. Bugu da kari, danko na HPMC zai kuma rage tare da karuwar zazzabi. Canje-canje a cikin wannan matakin galibi suna canzawa a cikin kaddarorin jiki, yayin da tsarin sunadarai ya kasance da canzawa.
Lokacin da zazzabi ya ci gaba zuwa zuwa 150-200 ° C, HPMC ya fara ne don yin lalata abubuwan lalata kayan lalata. Ana bayyana galibi ana bayyana shi a cikin cire hydroxypropyl da metoxy aiki ƙungiyoyi, sakamakon shi da raguwa a cikin nauyin kwayar halitta da canje-canje na tsari. A wannan matakin, HPMC na iya samar da karamin adadin ƙananan ƙwayoyin kwayoyin, kamar methanol da profionafdehyde.
2. Matsayi na matsakaici na matsakaici (200-300 ° C): Babban sarkar sarkar da kananan kwayoyin halitta
Lokacin da zazzabi na kara karu zuwa 200-300 ° C, da bazarar HPMC ya kara kara kara. Babban hanyoyin lalata sun hada da:
Ether bunkoson: Babban sarkar HPMC an haɗa ta hanyar rumfunan ringi na glucose, da kuma ɗaukakar ether a ciki a hankali ta rushe a ƙarƙashin babban zazzabi, yana haifar da sarkar polymer don bazu.
Dishirin da aka haifa: Tsarin zobe na sukari na HPMC na iya yin amfani da ƙwayar cuta a cikin babban zazzabi don samar da tsaka-tsakin tsaka-tsakin lokaci, wanda ke ƙara bayyana shi cikin samfuran maras tabbas.
Saki kananan kwayoyin halitta: A wannan matakin, HPMC sakin co, co₂, h₂o da kananan kwayoyin halitta kwayoyin halitta, kamar formaldehyde da acrolein.
Waɗannan canje-canjen zasu haifar da nauyin kwayar cutar HPMC don sauke mahimmancin, da kayan za su fara juya rawaya har ma suna samar da cunks.
3. Babban Mataki na zazzabi (300-500 ° C): Carbonization da Comk
Lokacin da zazzabi ya tashi sama da 300 ° C, HPMC ya shiga matakin lalata. A wannan lokacin, ƙarin breakage na babban sarkar da volatilization na ƙananan ƙwayoyin kwayoyin suna haifar da cikakken lalata tsarin, kuma a ƙarshe samar da sharan gona na carbonaceous (Coke). Abubuwan da zasu biyo baya galibi suna faruwa a wannan matakin:
Rashin lalacewar ciki: A babban zafin jiki, HPMC ya yi hakkin oxidation oxidation don samar da Co₂ da Co, kuma a lokaci guda samar da shuki na carbonaceous.
Coking dauki: Wani sashi na tsarin polymer ya canza zuwa cikin cikakken samfuran da bai cika kayan kwalliyar ba, kamar su carbon baƙar fata ko sharan cokali.
Products maras muhimmanci: Ci gaba da sakin Hydrocarbons kamar Ethylene, propylene, kuma methane.
Lokacin da ya yi zafi a cikin iska, HPMC na iya ƙara ƙonewa, yayin dumama cikin rashin oxygen musamman forms carbonized shayewa.
Dalilai da suka shafi lalacewar hpmc
Degradation thermal lalacewar hpmc ya shafi abubuwa da yawa da yawa, gami da:
Tsarin sunadarai: Matsayin canzawa na hydroxypropyl da metoxy kungiyoyi a HPMC yana shafar kwanciyar hankali ta mara lafiyarta. Gabaɗaya magana, hpmc tare da mafi girman abun ciki na hydroxypyl yana da mafi kyawun kwanciyar hankali.
A sararin yanayi na yanayi: A cikin iska, HPMC yana yiwuwa ga lalata lalata, yayin da a cikin yanayin gas na Tashsa (kamar nitrogen), ƙimar lalacewa ta therery), ƙimar ƙwayar ta therergen), ƙimar lalata ta therer.
Rage kudi: saurin dumama zai haifar da bazarar da sauri, yayin da jinkirin dumama na iya taimakawa HPMC don sannu-sannu carbonize kuma rage samar da kayan gaso mai hankali.
Danshi abun ciki: HPMC ya ƙunshi wani adadin da aka ɗaure. A lokacin aiwatar da dumama, da fitar da danshi zai shafi zazzabi ta gilashin da lalata.
Tasiri aikace-aikace na aikace-aikace na lalata na hpmc
Halin lalata lalata na hpmc suna da matukar muhimmanci a filin aikace-aikacen sa. Misali:
An yi amfani da HPMC a cikin ciyawar ciyawa da samfuran gypsum, da kuma kwanciyar hankali a yayin gina jiki dole ne a ɗauka don guje wa lalata aikin.
Masana'antar harhada magunguna: HPMC wakilin saki ne, kuma dole ne a guji lokacin da aka hana a lokacin babban samarwa don tabbatar da kwanciyar hankali na miyagun ƙwayoyi.
Masana'antar Abinci: HPMC wani abinci ne na abinci, da halayen lalata kayan lalata.
Tsarin lalata na zafi naHpmCZa a iya raba cikin cire ruwa da lalata na ruwa a cikin ƙaramin yanayin yanayin, babban sarkar sarkar volatilization a cikin matsakaicin matsakaici-zazzabi a cikin tsaka-tsaki da carberization a cikin babban yanayin zafi. Abubuwan da ke ciki na theryeral sun shafi abubuwa masu guba kamar su sunadarai, yanayi na yanayi, ragu da danshi abun ciki. Fahimtar tsarin lalata da HPMC na da matukar darajar inganta inganta aikace-aikacen da inganta kwanciyar hankali.
Lokacin Post: Mar-28-2025