"DMF npau npau: ib qho zoo saib ntawm cov khoom ntawm dimethylformamide
Dimethylformamide (DMF) yog cov organic kuab siv nyob rau hauv cov tshuaj lom neeg, kev lag luam hluav taws xob. Hauv tsab xov xwm no, peb yuav tham txog qhov kev nthuav dav lub boiling taw tes ntawm dmf, ib qho khoom tseem ceeb ntawm lub cev, thiab txheeb xyuas nws cov kev cuam tshuam ntawm cov ntawv thov siv tau.

1. Cov khoom yooj yim ntawm DMF

DMF yog cov kua tsis muaj kob uas muaj qhov tsis muaj zog ammonia tsw. Nws yog cov kuab tshuaj ncov qaumteb tsev thiab yog miscible nrog dej thiab feem ntau cov kuab tshuaj organic. Vim hais tias nws zoo solubility thiab hellof muaj feem ntau siv hauv tshuaj lom neeg, polymerisation cov tshuaj tiv thaiv, fiber ntau thiab zaj duab xis thiab zaj duab xis tsim. Paub txog qhov npau taws ntawm DMF yog ib qho ntawm cov yuam sij rau kev siv kom raug ntawm cov kuab tshuaj no. 2.

2. Dab tsi yog qhov npau npau ntawm DMF?

DMF muaj qhov cub kub ntawm 307 ° F (153 ° C). Qhov no tseem ceeb boiling point tso cai rau DMF yuav tsum tau siv rau kev nce qib kub uas yuav tsum muaj kev kub ntxhov, xws li cov tshuaj tiv thaiv cua sov, thiab cov kuab tshuaj ua kom zoo nkauj. Hauv cov ntawv thov no, DMF muab kev nyab xeeb thiab muaj txiaj ntsig kev tiv thaiv. 3.

3. Kev cuam tshuam ntawm DMF npau taws taw rau ntawm nws daim ntawv thov

Lub boiling taw tes ntawm DMF ncaj qha cuam tshuam rau nws daim ntawv thov hauv ntau qhov kev lag luam. Hauv kev lag luam kws tshuaj, lub siab npau npau txhais tau tias DMF tuaj yeem daws cov yeeb yaj xwm nyuaj-rau-daws cov tshuaj ntau dua, txhim kho cov tshuaj synthesis. Hauv kev lag luam tshuaj, muaj kev lag luam ntau rau cov kev cuam tshuam nrog cov kev cuam tshuam uas yuav tsum muaj qhov kub thiab txias, xws li kev tsim cov resins thiab polyamides. Cov cuab yeej no tseem ua rau DMF txoj kev siv hluav taws xob zoo tshaj plaws rau kev kub kub thiab inks.
Ntawm qhov tod tes, lub boiling taw tes ntawm DMF kuj cuam tshuam nws rov qab thiab ib puag ncig ua phooj ywg. Qhov twg distillation yuav tsum tau rov qab dmf, nws qhov cub tawg txiav txim siab siv hluav taws xob thiab ua tau zoo ntawm txoj kev rov ua kom zoo. Yog li ntawd, hauv kev siv tshuaj, tsis yog tshuaj lom neeg ntawm DMF yuav tsum tau txiav txim siab, tab sis kuj tseem muaj cov nyhuv ntawm kev ua haujlwm yuav tsum tau coj mus rau hauv tus account.

4. Qhov kub ntxhov ntawm DMF npau npau

Txawm hais tias DMF kub point yog 153 ° C ntawm cov qauv cua ntawm lub siab, hloov cov kev hloov siab ntawm huab cua kuj tseem tuaj yeem cuam tshuam rau qhov cub npau npau. Ntawm qhov kev ntsuas qis dua, lub boiling taw tes ntawm DMF txo qis, uas yog qhov zoo dua rau cov txheej txheem distillation uas muaj kev puas tsuaj rau qhov kev puas tsuaj qis rau cov tshuaj tiv thaiv kom sov. Nkag siab thiab paub txog cov kev hloov pauv hauv DMF boiling taw tes ntawm qhov sib txawv yog qhov tseem ceeb ntawm kev ua haujlwm zoo.

5. Kev Nyab Xeeb Kev Nyab Xeeb thiab ib puag ncig

DMF yog volatile tshuaj, thiab txawm hais tias nws muaj kev saib xyuas muaj kev tiv thaiv kom tiv thaiv tsis txhob muaj kev phom sij thaum lub sijhawm ntsuas kub. Lub sijhawm ntev ntawm DMF yuav cuam tshuam rau tib neeg kev noj qab haus huv, yog li ua raws li kev tiv thaiv kev ua kom puas tsuaj rau ib puag ncig kom tsis txhob muaj kuab paug ib puag ncig.
Lub ntsiab
Nkag siab DMF npau npau thiab nws yuav ua li cas nws cuam tshuam cov ntawv thov kev lag luam yog ib qho kev ua haujlwm tseem ceeb rau cov neeg ua haujlwm, thiab cov chaw ua haujlwm tseem ceeb hauv kev kub siab. Qhov kev nkag siab zoo ntawm DMF boiling ntsiab lus ntawm cov txheej txheem thiab kev ntsuas kev nyab xeeb tuaj yeem pab ua kom ua kom zoo rau cov txheej txheem, txhim kho kev ua haujlwm thiab ua kom muaj kev nyab xeeb txhim kho. Nws yog ib qho tseem ceeb kom ua raws li kev nyab xeeb thiab ib puag ncig kev cai thaum muab kev thov dMF kom ntseeg tau tias nws tau txais txiaj ntsig tau ua kom tiav. "