Cov txheej txheem ntau lawm thiab daim ntawv thov ntawm sodium carboxymethyl cellulose (CMC)
Sodium carboxymethyl cellulose (CMC) yog ib qho anionic, ncaj saw, dej-soluble cellulose ether, ib qho derivative ntawm ntuj cellulose thiab chloroacetic acid los ntawm kev hloov kho tshuaj lom neeg. Nws cov kua dej muaj cov haujlwm ntawm thickening, zaj duab xis tsim, bonding, dej khaws cia, colloidal tiv thaiv, emulsification thiab suspension, thiab tuaj yeem siv ua flocculant, chelating agent, emulsifier, thickener, dej khaws cia agent, sizing agent, zaj duab xis tsim khoom, thiab lwm yam, uas yog dav siv hauv zaub mov, tshuaj, khoom siv hluav taws xob, tshuaj tua kab, tawv, yas, luam ntawv, ceramics, kev lag luam tshuaj txhua hnub thiab lwm yam teb.
Sodium carboxymethyl cellulose feem ntau yog cov khoom hmoov, qee zaum granular lossis fibrous, dawb lossis daj daj, tsis muaj ntxhiab tshwj xeeb, yog ib qho tshuaj macromolecular, muaj zog ntub dej, tuaj yeem yaj hauv dej, hauv dej los ua cov kua nplaum nrog pob tshab siab. Insoluble hauv cov tshuaj organic dav dav, xws li ethanol, ether, chloroform thiab benzene, tab sis tuaj yeem yaj hauv dej, yaj ncaj qha hauv dej qeeb heev, tab sis solubility tseem loj heev, thiab cov kua dej muaj qee qhov viscosity. Cov khoom khov hauv ib puag ncig dav dav ruaj khov dua, vim nws muaj qee qhov dej nqus thiab av noo, hauv ib puag ncig qhuav, tuaj yeem khaws cia ntev.
① Cov txheej txheem tsim khoom
1. Txoj kev ntsuas dej nruab nrab
Cov txheej txheem dej-thee yog ib qho txheej txheem tsim khoom thaum ntxov hauv kev npaj sodium carboxymethyl cellulose hauv kev lag luam. Hauv cov txheej txheem no, cov alkali cellulose thiab cov neeg sawv cev etherifying ua rau hauv cov kua dej uas muaj cov pa oxygen oxide dawb, thiab dej siv ua cov tshuaj tiv thaiv hauv cov txheej txheem tiv thaiv, tsis muaj cov kuab tshuaj organic.
2. Txoj kev siv tshuaj yaj
Txoj kev siv cov kuab tshuaj yog txoj kev siv cov kuab tshuaj organic, uas yog ib txoj kev tsim khoom uas siv dej los hloov dej nrog cov kuab tshuaj organic ua ib qho tshuaj tiv thaiv. Ib txoj kev ua alkalization thiab etherification ntawm alkali cellulose thiab monochloroacetic acid hauv ib qho kuab tshuaj organic. Raws li qhov ntau ntawm cov tshuaj tiv thaiv, nws muaj peev xwm muab faib ua txoj kev kneading thiab txoj kev ua luam dej slurry. Qhov ntau ntawm cov kuab tshuaj organic siv hauv txoj kev pulping yog ntau dua li ntawm txoj kev kneading, thiab qhov ntau ntawm cov kuab tshuaj organic siv hauv txoj kev kneading yog qhov sib piv ntawm qhov hnyav ntawm cov cellulose, thaum qhov ntau ntawm cov kuab tshuaj organic siv hauv txoj kev pulping yog qhov sib piv ntawm qhov hnyav ntawm cov cellulose. Thaum sodium carboxymethyl cellulose raug npaj los ntawm txoj kev ua luam dej slurry, cov khoom ua tshuaj tiv thaiv yog nyob rau hauv lub xeev slurry lossis ncua hauv lub cev, yog li txoj kev ua luam dej slurry kuj hu ua txoj kev ncua.
3. Txoj kev Slurry
Txoj kev Slurry yog cov thev naus laus zis tshiab los tsim cov sodium carboxymethyl cellulose. Txoj kev Slurry tsis yog tsuas yog tsim cov sodium carboxymethyl cellulose uas muaj kev ntshiab siab xwb, tab sis kuj tsim cov sodium carboxymethyl cellulose uas muaj qib hloov pauv siab thiab sib xws. Cov txheej txheem tsim cov slurry yog kwv yees li nram no: cov paj rwb pulp uas tau zom ua hmoov raug xa mus rau lub tshuab alkalizing ntsug uas muaj isopropyl cawv, thiab cov kua sodium hydroxide ntxiv thaum sib tov yog alkalized, thiab qhov kub alkalizing yog li 20 ℃. Tom qab alkalization, cov khoom raug pumped rau lub tshuab etherifying ntsug, thiab cov kua isopropyl cawv ntawm chloroacetic acid ntxiv, thiab qhov kub etherifying yog li 65 ℃. Raws li kev siv khoom tshwj xeeb thiab cov kev cai zoo, qhov concentration alkalization, lub sijhawm alkalization, qhov ntau ntawm cov neeg sawv cev etherifying thiab lub sijhawm etherification thiab lwm yam txheej txheem tuaj yeem hloov kho.
② Daim ntawv thov
1. CMC tsis yog tsuas yog ib qho emulsifying stabilizer thiab thickener zoo hauv kev siv zaub mov xwb, tab sis kuj muaj kev khov thiab yaj zoo heev, thiab tuaj yeem txhim kho cov saj ntawm cov khoom thiab ntev lub sijhawm khaws cia.
2. Hauv cov tshuaj ntxuav tes, CMC tuaj yeem siv los ua tus neeg sawv cev tiv thaiv kev ua qias tuaj, tshwj xeeb tshaj yog rau cov hydrophobic synthetic fiber ntaub anti-fouling redeposition effect, zoo dua li carboxymethyl fiber.
3. Hauv kev khawb roj, nws tuaj yeem siv los tiv thaiv cov roj qhov dej ua cov av nkos stabilizer, tus neeg sawv cev khaws dej, qhov ntau ntawm txhua lub qhov dej roj yog 2 ~ 3t qhov dej ntiav, qhov dej tob 5 ~ 6t.
4. Siv rau hauv kev lag luam textile ua tus neeg sawv cev sizing, luam ntawv thiab dyeing slurry thickener, textile printing thiab stiffening finish.
5. Siv ua tus neeg sawv cev tiv thaiv kev tawg, emulsifier, dispersant, leveling agent, nplaum, tuaj yeem ua rau cov xim khov kho sib npaug hauv cov kuab tshuaj, yog li cov xim tsis tau stratified ntev, tab sis kuj siv rau hauv putty.
6. Ua ib qho flocculant hauv kev tshem tawm cov calcium ions dua li sodium gluconate zoo dua, ua ib qho kev pauv cation, lub peev xwm pauv mus txog 1.6ml / g.
7. Hauv kev lag luam ntawv siv ua tus neeg sawv cev ntsuas ntawv, tuaj yeem txhim kho lub zog qhuav thiab lub zog ntub ntawm daim ntawv thiab roj tsis kam, nqus kua mem thiab dej tsis kam.
8. Ua ib qho hydrosol hauv cov tshuaj pleev ib ce, siv ua tus neeg sawv cev thickening hauv cov tshuaj txhuam hniav, nws cov koob tshuaj yog li 5%.