Cov txheej txheem kev txheeb xyuas niaj hnub rau PVC
Dec 08, 2022| Kev txheeb xyuas los ntawm txoj kev combustion
Softening lossis melting kub ntau yam: 75 ~ 90 degree C;
combustion: tus kheej extinguishing tom qab ignition;
Cov nplaim hluav taws kub hauv lub xeev: daj nyob rau sab saum toj thiab ntsuab hauv qab nrog cov pa luam yeeb; Tom qab hluav taws: tua hluav taws; Odor: Irritating qaub saj.
Txoj kev no yog qhov yooj yim tshaj plaws thiab ncaj qha, thiab feem ntau nyiam.
Kev txheeb xyuas ntawm kev kho cov kuab tshuaj
Cov kuab tshuaj: tetrahydrofuran, cyclohexanone, dimethylformamide;
Tsis hnyav: methanol, acetone, heptane.
Ntxiv qhov xav tias PVC yas rau cov kuab tshuaj saum toj no thiab soj ntsuam qhov kev sib cais ntawm cov yas los txiav txim seb nws puas yog PVC. Tom qab cov kuab tshuaj yog rhuab, cov nyhuv dissolution yuav pom tseeb dua.
Txoj kev Hydrometric
Qhov tshwj xeeb lub ntiajteb txawj nqus ntawm PVC yog 1.35 ~ 1.45, feem ntau yog 1.38. Polyvinyl chloride thiab lwm yam yas tuaj yeem ua qhov txawv ntawm qhov sib txawv ntawm lub ntiajteb txawj nqus lossis los ntawm kev ntsuas lub ntiajteb txawj nqus. Txawm li cas los xij, vim tias PVC tuaj yeem hloov nws qhov tshwj xeeb lub ntiajteb txawj nqus thiab hardness zoo heev los ntawm kev ntxiv plasticizers, modifiers thiab muab tub lim, thiab ntau yam khoom ntawm PVC yas yuav hloov vim qhov sib ntxiv ntawm qee cov khoom, ua rau tsis muaj txiaj ntsig ntawm peb cov kev txheeb xyuas ntau yam thiab txawm tias qhov kev hloov pauv ntawm cov khoom. phenomena, ua rau nws tsis yooj yim sua kom txiav txim qhov tseeb. Piv txwv li, qhov ceev ntawm plasticized polyvinyl chloride (kwv yees li 40 feem pua plasticizer) yog 1.19 ~ 1.35; Txawm li cas los xij, PVC cov khoom tawv tau nce mus rau 1.38 ~ 1.50. Nyob rau hauv cov ntaub ntawv ntawm siab puv PVC khoom, qhov ceev tej zaum yuav tshaj 2.
Tsis tas li ntawd, nws tseem tuaj yeem txiav txim siab seb puas muaj cov tshuaj chlorine hauv cov khoom siv, tab sis vim tias vinyl chloride copolymer, neoprene roj hmab, polyvinylidene chloride, chlorinated polyvinyl chloride, thiab lwm yam., tag nrho cov muaj feem ntau ntawm cov tshuaj chlorine, lawv yuav tsum tau txheeb xyuas los ntawm pyridine. xim tshuaj tiv thaiv. Nco ntsoov tias ua ntej kev xeem, cov qauv xeem yuav tsum tau muab rho tawm nrog ether kom tshem tawm cov yas yas. Txoj kev sim: yaj cov qauv coj los nrog ether benzene hauv tetrahydrofuran, lim tawm cov khoom tsis sib xws, ntxiv methanol rau precipitate lawv, thiab qhuav lawv hauv qab thawj 75 degrees tom qab rho tawm. Ib qho me me ntawm cov qauv qhuav tsis xav tau 1mL pyridine los ua rau nws. Tom qab ob peb feeb, ntxiv 2 tee ntawm methanol tov ntawm 5 feem pua sodium hydroxide (1g sodium hydroxide yog yaj hauv 20mL methanol) rau ntawm qhov chaw. Saib cov xim tam sim ntawd, thiab saib dua tom qab 5 feeb thiab 1 teev. Cov khoom sib txawv chlorinated tuaj yeem txheeb xyuas raws li lawv cov xim.