Cov khoom siv raw ntawm cov yas yog hluavtaws cob, uas yog muab rho tawm thiab ua los ntawm cov roj av, cov pa roj lossis cov thee tawg.Cov roj, cov nkev roj, thiab lwm yam yog decomposed rau hauv cov organic tebchaw uas tsis muaj molecular (xws li ethylene, propylene, styrene, ethylene, vinyl cawv, thiab lwm yam), thiab cov low-molecular compounds yog polymerized rau hauv high-molecular organic compounds nyob rau hauv tej yam kev mob. , thiab tom qab ntawd plasticizers, Lubricants, fillers, thiab lwm yam, tuaj yeem ua rau ntau yam khoom siv yas.Feem ntau, cov resins tau ua tiav rau hauv granules kom yooj yim siv.Lawv feem ntau yog molded rau hauv cov khoom siv nrog qee cov duab nyob rau hauv cov cua kub thiab siab.
Lub cev muaj zog ntawm cov yas.Muaj ntau ntau yam khoom ntawm lub cev ntawm cov yas, cov hauv qab no tsuas yog ob peb yam uas yuav tsum tau nkag siab txog kev kawm toning thev naus laus zis:
1. Relative density: Relative density yog qhov piv ntawm qhov hnyav ntawm cov qauv mus rau qhov hnyav ntawm tib lub ntim dej ntawm qhov kub thiab txias, thiab yog ib txoj hauv kev tseem ceeb los txheeb xyuas cov khoom siv raw.
2. Tus nqi nqus dej: Cov khoom siv yas yog tsim rau hauv cov qauv ntawm qhov loj me, raus hauv dej distilled nrog qhov kub ntawm (25 ± 2) ℃, thiab qhov sib piv ntawm cov dej nqus los ntawm cov qauv rau cov khoom siv raw. tom qab 24 teev.Qhov loj ntawm qhov nqus dej txiav txim siab seb cov khoom siv yas puas yuav tsum tau muab ci thiab qhov ntev ntawm lub sijhawm ci.
3. Moulding kub: molding kub yog hais txog lub melting kub ntawm cov khoom raw khoom
4. Decomposition kub: Qhov kub decomposition yog hais txog qhov kub ntawm cov saw hlau macromolecular ntawm cov yas tawg thaum rhuab, thiab kuj yog ib qho ntawm cov cim qhia rau kev txheeb xyuas qhov kub ntawm cov yas.Thaum lub melting kub tshaj qhov decomposition kub, feem ntau ntawm cov ntaub ntawv raw yuav tig daj, txawm charred thiab dub, thiab lub zog ntawm cov khoom yuav txo tau zoo heev.
Post lub sij hawm: Jun-13-2022