Sooyaalka iyo Dulmarka
Ether-ka Cellulose waa maaddo kiimiko ah oo wanaagsan oo polymer ah oo si weyn loo isticmaalo oo laga sameeyay cellulose polymer-ka dabiiciga ah iyada oo loo marayo daawaynta kiimikada. Ka dib markii la soo saaray nitrate cellulose iyo cellulose acetate qarnigii 19-aad, farmashiyeyaashu waxay soo saareen taxane cellulose ah oo ka mid ah ethers cellulose badan, iyo beero cusub oo codsi ah ayaa la helay si joogto ah, oo ku lug leh qaybo badan oo warshado ah. Alaabooyinka ether-ka cellulose sida sodiumCarboxymethyl cellulose (CMC), Ethyl cellulose (EC), Hydroxyethyl cellulose (HEC), Hydroxypropyl cellulose (HPC), methyl hydroxyethyl cellulose (MHEC)iyomethyl hydroxypropyl cellulose (MHPC)iyo ether-yada kale ee cellulose waxaa loo yaqaanaa "industrial monosodium glutamate" waxaana si weyn loogu isticmaalay qodista saliidda, dhismaha, dahaarka, cuntada, daawada iyo kiimikooyinka maalinlaha ah.
Hydroxyethyl methyl cellulose (MHPC) waa budo cad oo aan ur lahayn, dhadhamin, aan sun ahayn oo lagu milmi karo biyo qabow si loo sameeyo xal muuqda. Waxay leedahay sifooyin dhumuc, xidhidh, kala firdhiyo, emulsifying, filim samaynta, laalista, adsorbing, gelling, dusha firfircoon, ilaalinta qoyaan iyo ilaalinta kolloid. Sababtoo ah dusha sare ee shaqada firfircoon ee xalka aqueous, waxaa loo isticmaali karaa sida wakiilka ilaalinta kolloidal, emulsifier iyo kala firdhiye. Hydroxyethyl methylcellulose aqueous aqueous ayaa leh biyo nadiif ah oo wanaagsan waana wakiil biyo celin hufan. Sababtoo ah hydroxyethyl methylcellulose waxay ka kooban tahay kooxaha hydroxyethyl, waxay leedahay awood wanaagsan oo ka hortagga caarada, xasiloonida viscosity iyo caabbinta caarada inta lagu jiro kaydinta muddada dheer.
Hydroxyethyl methylcellulose (HEMC) waxaa lagu diyaariyaa soo bandhigidda beddelka ethylene oxide (MS 0.3 ~ 0.4) ee methylcellulose (MC), iyo caabbinta milixdu waxay ka fiican tahay kuwa polymers-ka aan la bedelin. Heerkulka gelation ee methylcellulose sidoo kale wuu ka sarreeyaa kan MC.
Qaab dhismeedka
Muuqaal
Astaamaha ugu muhiimsan ee hydroxyethyl methylcellulose (HEMC) waa:
1. Solubility: Biyo ku milmay iyo qaar dareere organic ah. HEMC waxa lagu milmi karaa biyo qabow. Xoojinteeda ugu sareysa waxa kaliya oo lagu go'aamiyaa viscosity. Solubility wuxuu ku kala duwan yahay viscosity. Maqnaanshaha hoose, waa ka sii weynaanta milanka.
2. Cusbada iska caabbinta: Alaabooyinka HEMC waa ethers cellulose-ka aan-ionic ahayn oo ma aha polyelectrolytes, markaa waxay ku xasilloon yihiin xalalka aqueous marka cusbada birta ah ama electrolytes organic ay jiraan, laakiin ku darida xad-dhaafka ah ee electrolytes waxay sababi kartaa qulqulka iyo roobka.
3. Dhaqdhaqaaqa dusha sare: Sababtoo ah shaqada firfircoon ee dusha sare ee xalka aqueous, waxaa loo isticmaali karaa sida wakiilka ilaalinta kolloidal, emulsifier iyo kala firdhiyo.
4. Gel kuleyl: Marka xalka biyaha ee alaabta HEMC lagu kululeeyo heerkul gaar ah, wuxuu noqdaa mid mugdi ah, jeel ah, oo soo da'aya, laakiin marka si joogto ah loo qaboojiyo, wuxuu ku soo noqdaa xalkii asalka ahaa, heerkulku wuxuu ku dhacaa jelka iyo roobabku inta badan waxay ku xiran tahay iyaga saliidaha, qalabka joojinta, colloids ilaalinta, emuls.
5. Dheef-shiid kiimikaad iyo ur yar iyo udgoon: HEMC si weyn ayaa loogu isticmaalaa cuntada iyo daawada sababtoo ah ma metaboolayso oo waxay leedahay ur iyo udgoon yar.
6. Caawinta caarada: HEMC waxay leedahay iska caabin caariyaysi aad u wanaagsan iyo xasilloonida viscosity wanaagsan inta lagu jiro kaydinta muddada dheer.
7. Xasiloonida PH: Viscosity ee xalka aqueous ee alaabta HEMC si dhib leh uma saamayso aashitada ama alkali, iyo qiimaha pH waa mid deggan inta u dhaxaysa 3.0 ilaa 11.0.
Codsiga
Hydroxyethyl methylcellulose waxaa loo isticmaali karaa sida wakiilka kolloidal ilaalinta, emulsifier iyo kala firdhiso ay sabab u tahay shaqada dusha-firfircoon ee xal aqueous. Tusaalooyinka codsiyadeedu waa sida soo socota:
1. Saamaynta hydroxyethyl methylcellulose ee waxqabadka sibidhka. Hydroxyethyl methylcellulose waa ur aan ur lahayn, dhadhamin, budo cad oo aan sun ahayn oo lagu milmi karo biyo qabow si loo sameeyo xal hufan. Waxay leedahay sifooyin dhumuc, xidhidh, kala firdhiyo, emulsifying, filim samaynta, laalista, adsorbing, gelling, dusha firfircoon, ilaalinta qoyaan iyo ilaalinta kolloid. Maadaama xalka aqueous uu leeyahay shaqo firfircoon oo dusha sare ah, waxaa loo isticmaali karaa sida wakiilka ilaalinta kolloidal, emulsifier iyo kala firdhiye. Hydroxyethyl methylcellulose aqueous aqueous ayaa leh biyo nadiif ah oo wanaagsan waana wakiil biyo celin hufan.
2. Rinjiga gargaarka aadka u jilicsan ayaa la diyaariyey, kaas oo ka samaysan alaabta ceeriin ee soo socota qaybo miisaan: 150-200 g oo biyo ah; 60-70 g oo ah emulsion akril saafi ah; 550-650 g oo ah calcium culus; 70-90 g oo ah budada talcum; Salulose xal aqueous ah 30-40g; lignocellulose xal aqueous 10-20g; Kaalmada filim samaynta 4-6g; jeermiska dila iyo fungicides 1.5-2.5g; qaybinta 1.8-2.2g; wakiilka qoynta 1.8-2.2g; 3.5-4.5g; Ethylene glycol 9-11g; Xalka aqueous hydroxyethyl methylcellulose waxaa lagu sameeyaa iyadoo lagu milmay 2-4% hydroxyethyl methylcellulose biyaha; Xalka aqueous lignocellulose waxa laga sameeyaa 1-3 % Lignocellulose waxa lagu milmaan biyo.
Diyaarinta
Habka diyaarinta ee hydroxyethyl methyl cellulose, habka waa in suuf la safeeyey loo isticmaalo sida alaabta ceeriin, iyo ethylene oxide waxaa loo isticmaalaa sida wakiilka etherification si loogu diyaariyo hydroxyethyl methyl cellulose. Qaybaha miisaanka ee alaabta ceeriin ee diyaarinta hydroxyethyl methylcellulose waa sida soo socota: 700-800 qaybo ka mid ah toluene iyo isopropanol isku dar ah sida dareere ah, 30-40 qaybood oo biyo ah, 70-80 qaybaha sodium hydroxide, 80-85 qaybo ka mid ah suuf la safeeyey, giraanta 20-28 qaybo ka mid ah oxy0-90 chloride 190 methyl, glacial acetic acid; Tallaabooyinka gaarka ah waa:
Talaabada koowaad, ee kiliyaha falcelinta, ku dar toluene iyo isopropanol isku dar ah, biyo, iyo sodium hydroxide, kuleyl ilaa 60-80 ° C, diirimaad 20-40 daqiiqo;
Talaabada labaad, alkalization: qabooji walxaha kor ku xusan 30-50 ° C, ku dar suuf la safeeyey, buufin toluene iyo isopropanol dareere isku dar ah, vacuumize ilaa 0.006Mpa, buuxi nitrogen 3 beddelka, iyo fulinta ka dib beddelka Alkalinization, shuruudaha alkalization waa: wakhtiga alkalization waa 2 saacadood, iyo 5 °C heerkulka alkalization waa 30 ° C.
Talaabada saddexaad, etherification: ka dib marka alkalization la dhammeeyo, reactor ayaa loo daadgureeyay 0.05-0.07MPa, iyo ethylene oxide iyo chloride methyl waxaa lagu daraa 30-50 daqiiqo; marxaladda koowaad ee etherification: 40-60 ° C, 1.0-2.0 Saacadaha, cadaadiska waxaa lagu xakameynayaa inta u dhaxaysa 0.15 iyo 0.3Mpa; Marxaladda labaad ee etherification: 60～90℃, 2.0～2.5 saacadood, cadaadiska waxaa lagu xakameynayaa inta u dhaxaysa 0.4 iyo 0.8Mpa;
Talaabada afraad, dhexdhexaadinta: horay ugu darso glacial acetic acid oo la qiyaasay ka hor kiliyaha roobka, ku cadaadi walxaha etherified ee dhexdhexaadinta, kor u qaad heerkulka 75-80 ° C ee roobabka, heerkulku wuxuu kor u kacaa 102 ° C, qiimaha pH waxaa la ogaadaa inuu yahay 6 Saacadaha 8, bakhtigu waa la dhammeeyaa; Taangiga bakhtiyaa-nasiibka waxaa ka buuxsamay biyaha tuubada oo lagu daweeyay qalab kale oo osmosis ah oo ah 90 ° C ilaa 100 ° C;
Talaabada shanaad, dhaqidda centrifugal: walxaha ku jira tillaabada afraad waxaa lagu dhejiyaa iyada oo loo marayo screw centrifuge, iyo walxaha kala sooca ayaa loo wareejiyaa haanta dhaqidda oo ay ka buuxaan biyo kulul horay loogu dhaqay alaabta;
Talaabada lixaad, qalajinta centrifugal: walxaha la dhaqay waxaa loo gudbiyaa qalajiyaha iyada oo loo marayo centrifuge toosan, walxahana waa la qalajiyey 150-170 ° C, alaabta la qalajiyey waa la jajabiyey oo la duubay.
Marka la barbar dhigo tignoolajiyada wax-soo-saarka ether-ka cellulose ee jira, hal-abuurka hadda wuxuu isticmaalaa ethylene oxide sida wakiilka etherification si uu u diyaariyo hydroxyethyl methyl cellulose, kaas oo leh caabbinta caariyaysi wanaagsan sababtoo ah ka kooban kooxaha hydroxyethyl. Waxay leedahay xasiloonida viscosity wanaagsan iyo caabbinta caariyaysiga inta lagu jiro kaydinta muddada dheer. Waxaa loo isticmaali karaa halkii ethers kale ee cellulose.
Waqtiga boostada: Abriil-25-2024