Mesebetsi ea cellulose ether ka seretse ke: ho boloka metsi, ho eketsa momahano, ho teteaneng, ho ama nako ea ho beha, le thepa ea ho kenya moea.Ka lebaka la litšobotsi tsena, e na le sebaka se pharaletseng sa ts'ebeliso ea seretse sa thepa ea mohaho.
1. Ho boloka metsi a cellulose ether ke tšobotsi ea bohlokoa ka ho fetisisa ea ho sebelisoa ha seretse.
Lintlha tse ka sehloohong tse amang ho boloka metsi a cellulose ether: viscosity, boholo ba likaroloana, tekanyo, motsoako o sebetsang, tekanyo ea ho qhibiliha, mokhoa oa ho boloka metsi: ho boloka metsi a cellulose ether ka boeona ho tsoa ho solubility le dehydration ea cellulose ether ka boeona.Leha ketane ea cellulose ea molek'hule e na le palo e kholo ea lihlopha tsa hydroxyl tse nang le thepa e matla ea hydration, ha e qhibilihe metsing.Lebaka ke hobane sebopeho sa cellulose se na le tekanyo e phahameng ea crystallinity, 'me bokhoni ba hydration ba lihlopha tsa hydroxyl feela ha boa lekana ho senya likamano tse matla tsa intermolecular.Hydrogen bond le matla a van der Waals, kahoo e ruruha feela empa ha e qhibilihe ka metsing.Ha substituent e hlahiswa ka ketane ea limolek'hule, e seng feela substituent roba tlamo hydrogen, empa hape interchain hydrogen tlamo e robehile ka lebaka la wedging ea substituent pakeng tsa liketane tse haufi.Ha e le e kholoanyane, sebaka se pakeng tsa limolek'hule se seholo, se senyang phello ea hydrogen bond.Ha lesela la cellulose le le leholo, tharollo e kena ka mor'a hore lesela la cellulose le atolohe, 'me cellulose ether e fetoha e qhibilihang ka metsing, e etsa tharollo e phahameng ea viscosity.Ha mocheso o phahama, hydration ea polymer e fokotseha, 'me metsi a pakeng tsa liketane a lelekoa.Ha ho felloa ke metsi 'meleng ho lekane, limolek'hule li qala ho bokellana, li etsa sebopeho sa marang-rang a mararo le pula ea gel.
(1) Phello ea boholo ba likaroloana le nako ea ho kopanya ea cellulose ether ho boloka metsi
Ka tekanyo e lekanang ea cellulose ether, ho boloka metsi a seretse ho eketseha ka ho eketseha ha viscosity;ho eketseha ha palo ea cellulose ether le ho eketseha ha viscosity ho eketsa ho boloka metsi a seretse.Ha litaba tsa cellulose ether li feta 0.3%, phetoho ea ho boloka metsi a seretse e atisa ho leka-lekana.Bokhoni ba ho boloka metsi ba seretse bo laoloa haholo ke nako ea ho qhibiliha, 'me ether e ntle ea cellulose e qhibiliha ka potlako,' me matla a ho boloka metsi a hōla ka potlako.
(2) Phello ea tekanyo ea etherification ea cellulose ether le mocheso holim'a ho boloka metsi
Ha mocheso o ntse o phahama, ho bolokoa ha metsi hoa fokotseha, 'me ha tekanyo ea etherification ea cellulose ether e phahame, ho molemo ho boloka metsi a selulose ether.Nakong ea tšebeliso, mocheso oa seretse se sa tsoa tsoakoa hangata o ka tlase ho 35 ° C, 'me tlas'a maemo a khethehileng a leholimo, mocheso o ka fihla kapa oa feta 40°C.Tabeng ena, foromo e tlameha ho fetoloa 'me sehlahisoa se nang le tekanyo e phahameng ea etherification se lokela ho khethoa.Ke hore, nahana ka ho khetha ether ea cellulose e loketseng.
2. Phello ea cellulose ether moeeng oa seretse
Ka lihlahisoa tsa seretse se omeletseng, ka lebaka la ho eketsoa ha cellulose ether, palo e itseng ea li-bubble tsa moea tse nyenyane, tse arolelitsoeng ka mokhoa o ts'oanang le tse tsitsitseng li kenngoa ka har'a seretse se sa tsoa tsoakana.Ka lebaka la phello ea bolo ea li-bubble tsa moea, seretse se na le ts'ebetso e ntle ea ho sebetsa mme se fokotsa ho hlohlona ha seretse.Crack le shrinkage, 'me eketsa sekhahla sa tlhahiso ea seretse.
3. Phello ea cellulose ether ho samente hydration
Cellulose ether e na le tšitiso ea ho phalla ha seretse se entsoeng ka samente, 'me phello ea ho lieha e matlafatsoa ke keketseho ea selulose ether.Lintlha tse susumetsang tsa cellulose ether ka samente hydration ke: tekanyo, tekanyo ea etherification, mofuta oa samente.
Nako ea poso: Feb-02-2023