Dab tsi yog cov hau kev rau synthesizing povidone?

Polyvidone (PVP) yog ib qho tseem ceeb dej - soluble polymer compound, thiab nws cov synthesis cov qauv tsuas yog suav nrog cov hauv qab no:
1. Solut polymerization:
Hauv cov kuab tshuaj, 1-vinyl-2-pyrrolidone (NVP) yog siv los ua monomer (xws li pej fais fab (xws li pej fais fab lossis azo compound) yog siv los pib cov tshuaj tiv thaiv polymerization.
Cov kuab tshuaj uas suav nrog dej, ethanol lossis dimethylformamide (DMF).
Cov tshuaj tiv thaiv muaj mob me thiab molecular hnyav faib ntawm cov khoom yog nqaim.
Cov molecular hnyav thiab cov khoom ntawm cov polymer tuaj yeem tswj tau los ntawm kev kho hom kev daws teeb meem thiab cov tshuaj tiv thaiv.
2. Bulk polymerization:
Tsis muaj cov kuab tshuaj yog siv, thiab NVP monomer yog ncaj qha rau rhuab rau polymerization.
Qhov pib yuav tsum tau, thiab cov kab mob viscosity yog qhov siab thaum lub sij hawm.
Nws yog qhov haum rau kev npaj ntawm high - purity polyvidone, tab sis cov tshuaj tiv thaiv tshav kub yog qhov nyuaj los tswj.
3. Ncua qib polymerization:
Tus NVP monomer yog dispersed nyob rau hauv theem aqueous los ua kev ncua ntawv rau polymerization.
Siv cov roj - Solule pib thiab tus neeg sawv cev ncua (xws li dej cawv polyvinyl).
Cov khoom yog hlaws {{0} Zoo li particle uas yooj yim cais thiab lis.
4. Emulsion Polymerization:
Tus NVP monomer yog dispersed rau hauv ib qho emulsion nyob rau hauv kev ua ntawm ib emulsifier rau polymerization.
Cov tshuaj tiv thaiv ceev nrawm yog nrawm thaum dej - Soluble pib siv.
Cov khoom muaj qhov me me me me thiab qhov ruaj khov ruaj khov.
5. Khoom cua ntawm tus ntoo khaublig-}}} link link-link link-polyvinylprolidone:
Npaj los ntawm cov txheej txheem tshwj xeeb polymerization (xws li paj kws polymerization).
Alkali hlau hydroxide thiab tus ntoo khaub lig - Txuas tus neeg sawv cev yog siv los ua kom sov nyob rau hauv nitrogen tiv thaiv.
Cov khoom muaj cov qauv sib dhos thiab cov dej nqus dej siab.
Cov hau kev no muaj lawv tus kheej thiab qhov tsis zoo, thiab kev xaiv yuav tsum tau ua kom zoo raws li cov kev xav tau thiab kev xaiv npe. Nws raug nquahu kom tham cov ntaub ntawv tsim nyog rau cov ntsiab lus tswv yim ntxaws.