Paraformaldehyde yog ib qho khoom polymer ntawm formaldehyde muab raws li CAS tus lej 30525-89-4. Nws zoo nkaus li dawb crystalline hmoov los yog flake nrog cov yam ntxwv pungent formaldehyde tsw. Vim tias nws khaws cia thiab thauj khoom nyab xeeb dua li cov pa roj formaldehyde lossis aqueous formalin, paraformaldehyde tau dav siv thoob plaws hauv cov resin, tshuaj tua kab mob, coatings, thiab kuaj kev lag luam raws li cov khoom siv yooj yim ntawm formaldehyde.
Chemical Identity thiab Physical Properties
Paraformaldehyde muaj cov qauv dav dav HO (CH2O)nH, qhov twg n feem ntau yog li ntawm 8 txog 100 formaldehyde units. Yog li ntawd nws tsis yog ib qho molecule tab sis sib xyaw ntawm qis -molecular- hnyav polyoxymethylene glycols. Cov khoom tseem ceeb ntawm lub cev muaj xws li:
Cov tsos mob: dawb crystalline hmoov, prill, los yog flake
CAS Nr .: 30525-89-4
Cov ntsiab lus formaldehyde: feem ntau 91 txog 96 feem pua ntawm qhov hnyav nyob ntawm qib
Solubility: maj mam soluble hauv dej txias; hydrolyzes thiab yaj hauv dej kub, tso formaldehyde
Solubility hauv organic media: xyaum insoluble hauv ethanol thiab diethyl ether
Decomposition: depolymerizes rau formaldehyde roj thaum rhuab tshaj li ntawm 120 degrees Celsius
Kev solubility qeeb hauv dej txias thiab tso tawm sai sai ntawm formaldehyde hauv dej kub lossis hauv qab cua sov ua rau paraformaldehyde tswj tau qhov chaw ntawm formaldehyde rau cov tshuaj tiv thaiv uas yuav tsum tau maj mam muab cov monomer.
Main Industrial Applications ntawm Paraformaldehyde
Resin thiab Adhesive Manufacturing
Daim ntawv thov loj tshaj plaws ntawm paraformaldehyde yog kev tsim cov khoom siv hluavtaws thiab cov binders. Nws reacts nrog urea, melamine, phenol, resorcinol, thiab tannin los tsim urea -formaldehyde, melamine-formaldehyde, thiab phenolic resins. Cov resins no yog siv los ua cov khoom sib txuas hauv kev tsim cov particle board, fiberboard, thiab plywood, thiab hauv kev tsim cov molding tebchaw thiab laminates.
Disinfection thiab Sanitation
Paraformaldehyde yog siv los ua ib qho khoom fumigant thiab tshuaj tua kab mob hauv cov chaw ua liaj ua teb, tsev qaib, hatcheries, thiab kev ua liaj ua teb tsiaj. Thaum tshav kub los yog tov nrog dej, nws tso tawm formaldehyde vapor, uas muab dav -spectrum antimicrobial kev ua si rau qhov chaw tua kab mob.
Histology thiab Laboratory Fixation
Hauv cov chaw kuaj mob histology thiab pathology, paraformaldehyde yog siv los npaj cov tshuaj formaldehyde tshiab rau kev kho cov ntaub so ntswg. Npaj cov fixative tshiab los ntawm cov khoom paraformaldehyde tuaj yeem txo cov kab mob methanol uas feem ntau muaj nyob rau hauv kev lag luam formalin, thiab nws tso cai rau cov concentration ntawm fixative tswj tau meej.
Coatings thiab Chemical Synthesis
Hauv cov txheej txheem txheej txheej, qis- cov qib kua qaub ntawm paraformaldehyde txhim kho gloss tswj thiab tsim kev ruaj ntseg los ntawm kev tiv thaiv kev tsim cov kua qaub los ntawm - khoom. Paraformaldehyde kuj tseem ua haujlwm nruab nrab hauv cov organic synthesis, suav nrog kev tsim cov tshuaj chelating, textile finishing chemicals, thiab tshwj xeeb monomers.
Paraformaldehyde piv rau Formalin
Formalin yog cov tshuaj aqueous uas muaj kwv yees li 37 feem pua formaldehyde, feem ntau stabilized nrog methanol. Paraformaldehyde yog cov khoom polymerized daim ntawv ntawm tib lub monomer. Piv nrog rau formalin, paraformaldehyde muaj ntau dua formaldehyde cov ntsiab lus ib chav tsev qhov hnyav, qis shipping nyhav, tsis muaj methanol stabilization yuav tsum, thiab lub neej ntev npaum li cas. Kev lag luam tawm -tawm yog tias nws yuav tsum tau depolymerized, ib txwm ua los ntawm cua sov lossis kev sib cais hauv cov dej kub, ua ntej nws tuaj yeem koom nrog feem ntau cov tshuaj tiv thaiv.
Kev ruaj ntseg tuav, khaws cia, thiab kev thauj mus los
Paraformaldehyde yog cais raws li cov khoom flammable thiab tso tawm cov tshuaj lom formaldehyde vapor rau cua sov. Cov kev ceev faj hauv qab no yog qhov tseem ceeb:
Ua hauj lwm hauv qhov chaw zoo- qhov cua thiab siv qhov cua tso pa hauv zos qhov twg muaj cua sov lossis tawg
Hnav tshuaj lom neeg- hnab looj tes tiv thaiv, tsom iav kev nyab xeeb, thiab khaub ncaws tiv thaiv kom tsis txhob muaj tawv nqaij thiab qhov muag
Siv kev tiv thaiv ua pa rau formaldehyde vapor thaum muaj kev txwv ntau tshaj
Khaws cov thawv kaw kom nruj thiab khaws cia rau hauv qhov chaw txias, qhuav, zoo- qhov cua qhov chaw kom deb ntawm tshav kub, qhib nplaim taws, thiab cov ntaub ntawv tsis sib xws xws li cov oxidizers muaj zog
Ntxuav cov spills tam sim ntawd nrog cov absorbents tsim nyog thiab pov tseg cov pov tseg raws li ib puag ncig kev cai hauv zos
Ua raws li cov khoom txaus ntshai rau kev thauj mus los, raws li paraformaldehyde tau tswj hwm raws li kev cai thauj khoom thoob ntiaj teb
Cov lus nug nquag
Paraformaldehyde yog dab tsi?Paraformaldehyde muaj cov qauv dav dav HO (CH2O)nH, qhov twg n feem ntau yog li ntawm 8 txog 100 formaldehyde units.
Yuav siv paraformaldehyde li cas hauv kev lag luam?Resin thiab Adhesive Manufacturing Qhov loj tshaj plaws daim ntawv thov ntawm paraformaldehyde yog zus tau tej cov hluavtaws resins thiab binders. Nws reacts nrog urea, melamine, phenol, resorcinol, thiab tannin los tsim urea -formaldehyde, melamine-formaldehyde, thiab phenolic resins.
Dab tsi yog qhov txawv ntawm paraformaldehyde thiab formalin?Npaj cov fixative tshiab los ntawm cov khoom paraformaldehyde tuaj yeem txo cov kab mob methanol uas feem ntau muaj nyob rau hauv kev lag luam formalin, thiab nws tso cai rau cov concentration ntawm fixative tswj tau meej. Formalin yog cov tshuaj aqueous uas muaj kwv yees li 37 feem pua formaldehyde, feem ntau stabilized nrog methanol.
Yuav khaws cov paraformaldehyde li cas?Cov kev ceev faj hauv qab no yog qhov tseem ceeb: Ua haujlwm hauv qhov chaw zoo - qhov cua thiab siv cov pa cua hauv zos qhov twg cua sov lossis kev sib cais tshwm sim. Hnav cov tshuaj lom neeg- hnab looj tes tiv thaiv, tsom iav kev nyab xeeb, thiab cov khaub ncaws tiv thaiv kom tiv thaiv tawv nqaij thiab qhov muag. Siv kev tiv thaiv ua pa rau formaldehyde vapor thaum muaj kev txwv ntau tshaj. Khaws cov thawv kaw kom nruj thiab khaws cia hauv qhov txias, qhuav.
Cov cuab yeej tiv thaiv dab tsi yog xav tau thaum tuav paraformaldehyde?Cov kev ceev faj hauv qab no yog qhov tseem ceeb: Ua haujlwm hauv qhov chaw zoo - qhov cua thiab siv cov pa cua hauv zos qhov twg cua sov lossis kev sib cais tshwm sim. Hnav cov tshuaj lom neeg- hnab looj tes tiv thaiv, tsom iav kev nyab xeeb, thiab cov khaub ncaws tiv thaiv kom tiv thaiv tawv nqaij thiab qhov muag. Siv kev tiv thaiv ua pa rau formaldehyde vapor thaum muaj kev txwv ntau tshaj. Khaws cov thawv kaw kom nruj thiab khaws cia hauv qhov txias, qhuav.