PS thiab ABS (1)

1. PS (polystyrene)

1.PS kev ua tau zoo

PS yog cov tshuaj amorphous uas muaj qhov zoo fluidity thiab nqus dej tsawg (tsawg dua 00.2%). Nws yog cov yas pob tshab uas yooj yim rau pwm thiab txheej txheem. Nws cov khoom muaj lub teeb xa ntawm 88-92%, muaj zog muaj zog thiab siab hardness. Txawm li cas los xij, PS cov khoom lag luam yog cov nkig, ntxim rau kev ntxhov siab sab hauv, qhov kub tsis zoo tiv thaiv (60-80℃), tsis muaj tshuaj lom, thiab lub zog nqus ib puag ncig 1.04g / cm3 (me dua dej dua).

Moulding shrinkage (nws tus nqi feem ntau yog 0.004-0.007), lub npe ntawm cov pob tshab PS tsuas yog txhais tau hais tias cov pob tshab ntawm cov khoom siv, tsis yog crystallinity. (Cov khoom siv hauv lub cev thiab lub cev: Feem ntau ntawm kev ua lag luam PSs yog pob tshab, cov ntaub ntawv amorphous. PS muaj qhov zoo heev geometric stability, thermal stability, cov khoom sib kis tau zoo, cov khoom hluav taws xob rwb thaiv tsev, thiab cov me me noo noo kom zoo rau nws. Nws tuaj yeem tiv taus dej thiab diluted inorganic acids, tab sis tuaj yeem kho tau los ntawm cov muaj zog oxidizing acids xws li cov sulfuric acid ntau ntau, thiab tuaj yeem pauv thiab deform hauv qee cov kuab tshuaj organic.)

2. PS cov txheej txheem cov yam ntxwv

PS lub ntsiab lus melting yog 166℃, kev ntsuas kub yog feem ntau 185-215℃, melting kub 180 ~ 280℃, rau cov nplaim hluav taws kub retardant cov ntaub ntawv, lub siab txwv yog 250℃, qhov ntsuas kub tsis ntau yog txog 290℃, yog li cov txheej txheem ntsuas cov kub ntau.

Pwm kub 40 ~ 50℃, Kev txhaj tshuaj siab: 200 ~ 600bar, kev txhaj tshuaj nrawm raug pom zoo kom siv kev txhaj tshuaj nrawm, kev sib tw khiav thiab lub rooj vag tuaj yeem siv txhua hom kev sib dhos. Ua ntej ua cov khoom PS, tsuas yog khaws cia tsis raug, nws tsis tas yuav tsum ziab. Yog tias yuav tsum tau ziab, qhov pom zoo kom qhuav yog 80C rau 2 ~ 3 teev.

Vim tias PS cov cua sov tshwj xeeb qis, nws tuaj yeem ua kom sai sai thiab ua kom zoo ntawm qee cov pwm rau kub ua kom sov, nws qhov txias txias tau nrawm dua li ntawm cov ntaub ntawv raw, thiab lub sijhawm qhib pwm tuaj yeem ua ntej lawm. Lub sijhawm plasticizing thiab lub sijhawm txias dua, thiab lub sijhawm molding voj voog yuav raug txo kom tsawg; lub ci ntawm PS cov khoom lag luam tau zoo dua raws li cov pwm kub nce.

3. Raug daim ntawv thov ntau

Cov khoom lag luam ntim (ntim, npog, hwj)) cov khoom siv kho mob pov tseg, cov khoom ua si, khob, rab riam, daim kab xev reels, cua tshuab qhov rai, thiab ntau cov khoom lag luam ua npuas-qe qe. Nqaij thiab nqaij qaib ntim cov tais, cov ntawv lo ntawm lub raj mis thiab cov ntawv ua npuas ua npuas cushion PS, cov khoom ntim khoom, cov khoom siv hauv tsev (cov tais diav, cov tais, thiab lwm yam), hluav taws xob (ntim khoom ntim, cov khoom siv hluav taws xob, cov yeeb yaj kiab insulating, thiab lwm yam).