Kev txheeb xyuas lub hauv paus ntawm ntau yam yooj yim-rau-siv plastics

(1) Kev txheeb xyuas lub hauv paus ntawm polyethylene thiab polypropylene yas

Polyethylene thiab polypropylene yas yog ob qho tib si mis nyuj dawb translucent lub cev, lub teeb hauv qhov hnyav thiab tuaj yeem ntab rau saum dej, thiab qhov tshwm sim kub kub yog qhov zoo ib yam. Txawm li cas los xij, tseem muaj qhov sib txawv ntawm ob qho: polyethylene muaj waxy thiab greasy zoo rau tes, thiab kev ntxhib los mos yog mos thiab khoov tau, thaum lub polypropylene xav tias du thiab muag heev, tab sis tsis muaj waxy thiab greasy xav, thiab muaj ib qho nyuaj. thiab tawv tawv; polyethylene yas yog siv nyob rau hauv Nws softens ho nyob rau hauv boiling dej, tab sis polypropylene yas tsis soften ho nyob rau hauv boiling dej; polyethylene yas strips muaj "lub caj dab nyias" thaum ncab, tab sis polypropylene tsis.

(2) Kev txheeb xyuas lub hauv paus ntawm polyvinyl chloride thiab polyethylene yas zaj duab xis

Cov txheej txheem ntawm polyvinyl chloride thiab polyethylene yog txawv: polyvinyl chloride yog nias rau hauv ib zaj duab xis los ntawm ib txoj kev calendering, thiab polyethylene yog ua rau hauv ib lub hnab cylindrical ob txheej los ntawm tshuab molding; Los ntawm kev pom ntawm xim thiab pob tshab: polyethylene yog milky dawb thiab translucent. Qhov saum npoo yog ci dua, txhais tes xav tias waxy thiab du, thiab cov khaubncaws sab nraud povtseg tseem yog mis nyuj dawb thiab translucent, thaum lub pob tshab ntawm polyvinyl chloride yog siab dua li ntawm polyethylene, xim yog xim daj me ntsis, thiab cov khaubncaws sab nraud povtseg yog daj thaum sib dhos ua ke, thiab txhais tes yog du. , tab sis nws muaj qhov nplaum nplaum, thiab muaj cov kab zoo pwm thaum ua tib zoo saib; Qhov tshwm sim kub hnyiab yog txawv: polyethylene yog flammable, melts thiab drips, thiab muaj ib tug paraffin tsw, thaum polyvinyl chloride yog inflammable, lub nplaim taws yog ntsuab, thiab muaj ib tug pungent tsw ntawm hydrochloric acid. Tso tawm; polyethylene nrog lub ntiajteb txawj nqus me me tuaj yeem ntab rau saum npoo dej, thaum polyvinyl chloride tso rau hauv dej.

(3) Kev txheeb xyuas lub hauv paus ntawm phenolic thiab urea-formaldehyde plastics

Ob leeg yog thermosetting plastics, uas yog tawv thiab opaque. Qhov sib txawv tseem ceeb yog raws li hauv qab no: phenolic plastics feem ntau yog xim dub thiab xim av, thiab urea-formaldehyde plastics feem ntau yog xim xim thiab ci xim; Cov qauv yog nruj; Thaum kub hnyiab, phenolic tsw emits phenol, thiab carbonization cracking tshwm sim nyob rau hauv ib feem ntawm cov nplaim taws;

(4) Kev txheeb xyuas lub hauv paus ntawm polystyrene, polyvinyl chloride thiab polyethylene yas

Kev txheeb xyuas ntawm peb cov yas no yog ua raws li tsib yam hauv qab no:

1. Xim thiab Transparency

Polystyrene plastics yog xim ci thiab muaj pob tshab zoo li iav; PVC yas tsis muaj xim thiab pob tshab rau polystyrene; polyethylene plastics yog translucent thiab zoo li cov khoom siv quav ciab, thiab cov xim dyes yooj yim nkag mus.

2. Xav

Polystyrene muaj ib tug du tes thiab ib tug nyuaj nto, uas yog ntshai ntawm bumping thiab extrusion; PVC muaj lub ntsej muag du, thiab cov khoom siv yeeb yaj kiab muaj qhov nplaum nplaum; muaj cov khoom muag muag thiab tawv; polyethylene muaj waxy thiab greasy xav. , Cov khoom yog mos thiab resistant rau dabtsi yog khoov.

3. txheeb ze ntom ntom

Tus txheeb ze ntom ntom ntawm polystyrene yog 1.05 ~ 0.06, thiab nws maj mam hauv dej; Tus txheeb ze ntom ntom ntawm polyvinyl chloride mos yas yog 1.24 ~ 1.45, thiab tus txheeb ze ntom ntom ntom yog 1.35 ~ 1.45, yog li nws yuav sai sai hauv dej. Tus txheeb ze ntom ntom ntawm high-density polyethylene yog 0.94 ~ 0.97, thiab tus txheeb ze ntom ntom ntom ntom polyethylene yog 0.91 ~ 0.93, yog li nws ntab hauv dej.

4. Suab

Thaum ntaus los ntawm ib qho khoom siv tawv, polystyrene muaj lub suab zoo nkauj, polyvinyl chloride yog nrov tab sis tsis nkig, thiab polyethylene yog qhov khaus tab sis tsis nkig.

5. Flammability

Polystyrene yog flammable, nplaim taws yog txiv kab ntxwv-daj, flocculent dub pa luam yeeb, thiab muaj ib tug pungent thiab tsis kaj siab tsw ntawm styrene monomer; polyvinyl chloride tsis tuaj yeem tshwm sim tshwm sim, nws tawm ntawm qhov hluav taws kub, nplaim taws daj, cov hauv paus hniav ntsuab, thiab muaj ntxhiab tsw ntawm hydrochloric acid tso tawm; Polyethylene yog nplaim taws, nplaim daj, lub hauv paus yog xiav, emits me me. cov pa luam yeeb dub, softens thaum hlawv, drips ciab kua muag zoo li tswm ciab, thiab emits paraffin tsw.