Hom hom thiab kev qhia txog cov yas.

Yas, uas yog, cov roj hmab yas, yog cov roj hmab granule tsim los ntawm polymerization ntawm roj av refining khoom thiab qee yam tshuaj.Nws yog ua tiav los ntawm cov tuam ntxhab los tsim cov khoom yas ntawm ntau yam duab.

1. Kev faib tawm ntawm cov yas: Tom qab ua tiav thiab cua sov, cov yas tuaj yeem muab faib ua ob pawg: thermoplastic thiab thermosetting.Common yog cov hauv qab no:
1) PVC-polyvinyl chloride
2) PE-polyethylene, HDPE-siab ntom polyethylene, LDPE-tsis tshua muaj polyethylene
3) PP-Polypropylene
4) PS-polystyrene
5) Lwm cov ntaub ntawv luam tawm yog PC, PT, PET, EVA, PU, ​​​​KOP, Tedolon, thiab lwm yam.

2. Kev txheeb xyuas yooj yim ntawm ntau hom yas:
Distinguishing raws li tsos:
1) PVC daim kab xev yog mos thiab muaj zoo extensibility.Tsis tas li ntawd, tseem muaj qee cov khoom siv tawv lossis foamed, xws li cov kav dej, qhov rooj zawv zawg, thiab lwm yam.
2) PS, ABS, mos thiab nkig kev ntxhib los mos, feem ntau nto txhaj molding.
3) HDPE hauv PE yog lub teeb hauv kev ntxhib los mos, zoo nyob rau hauv toughness thiab opaque, thaum LDPE yog me ntsis ductile.
4) PP muaj qee yam pob tshab thiab nkig.

Paub qhov txawv raws li cov khoom siv tshuaj lom neeg:
1) PS, PC thiab ABS tuaj yeem yaj hauv toluene kom corrode lawv qhov chaw.
2) PVC yog insoluble nrog benzene, tab sis tuaj yeem yaj nrog ketone hnyav.
3) PP thiab PE muaj alkali tsis kam thiab zoo hnyav hnyav.

Distinguishing raws li flammability:
1) Thaum PVC hlawv nrog hluav taws, nws yuav decompose cov ntxhiab ntawm chlorine, thiab thaum hluav taws tawm, nws yuav tsis hlawv.
2) PE yuav tsim cov ntxhiab tsw ntxhiab thaum kub hnyiab, nrog cov waxy droplets, tab sis PP yuav tsis, thiab ob qho tib si tseem yuav kub hnyiab tom qab tawm hauv hluav taws.

3. Cov yam ntxwv ntawm ntau yam yas
1) Cov yam ntxwv ntawm PP: Txawm hais tias PP muaj pob tshab, nws qhov kev ntxhib los mos yog yooj yim tawg, uas yog qhov zoo dua rau kev ntim khoom noj.Ntau yam khoom sib txawv tuaj yeem muab tau los ntawm kev txhim kho lawv cov pob txha puas.Piv txwv li: OPP thiab PP yog uniaxially txuas ntxiv los txhim kho lawv lub zog, uas feem ntau yog siv rau hauv cov ntim sab nrauv ntawm cov ntaub so ntswg thiab cov chopsticks.
2) Cov yam ntxwv ntawm PE: PE yog ua los ntawm ethylene.Qhov ceev ntawm LDPE yog li 0.910 g / cm-0.940 g / cm.Vim nws cov tawv tawv zoo heev thiab muaj peev xwm tiv taus noo noo, nws feem ntau siv hauv ntim khoom noj, ntim tshuaj pleev ib ce, thiab lwm yam.;Qhov ceev ntawm HDPE yog hais txog 0.941 g / cm2 lossis ntau dua.Vim nws lub teeb kev ntxhib los mos thiab kub ua hauj, nws yog feem ntau siv nyob rau hauv handbags thiab ntau yam yooj yim hnab.