Dab tsi yog qhov txawv ntawm Polypropylene thiab Polyurethane?
Polypropylene (PP) yog qhov thib ob feem ntau tsim cov yas hauv ntiaj teb, tom qab polyethylene (PU).
Lawv yog ob qho tib si ntau yam thiab ruaj khov, thiab lawv tau siv ntau yam kev siv. Kev nkag siab txog qhov sib txawv ntawm PP thiab PU yog qhov tseem ceeb vim tias nws tso cai rau koj xaiv cov khoom tsim nyog rau txoj haujlwm.
1. Cov khoom ntawm polypropylene
1.1. Lub cev muaj zog
Polypropylene (PP) yog cov thermoplastic polymer uas paub txog nws lub teeb yuag, lub zog, yoog raws, thiab ua haujlwm kub.
Cov tsos mob: PP yog dawb, translucent khoom.
Lub teeb yuag: Nrog rau qhov ntom ntom ntawm kwv yees li 0.9 g / cm3, PP yog ib qho ntawm cov khoom siv yooj yim tshaj plaws. Qhov no ua rau nws zoo meej rau cov ntawv thov kom txo qhov hnyav, xws li tsheb thiab aerospace.
Muaj zog: PP yog ib qho tawv thiab siv tau ntev polymer uas tiv taus qhov cuam tshuam, puas, thiab qaug zog. Nws muaj qhov sib npaug tensile zog rau hlau txog li 48 MPa. Yog li ntawd, nws yog qhov zoo tshaj plaws rau cov ntawv thov uas xav tau lub zog thiab kav ntev, xws li kev ntim khoom thiab kev tsim kho.
Flexible: PP yog cov khoom siv ntau yam uas tuaj yeem yooj yim molded rau hauv ib qho ntawm cov duab. Qhov no ua rau nws zoo meej rau cov ntawv thov uas xav tau cov duab nyuaj, xws li kev kho mob thiab cov khoom siv.
Thaum tshav kub kub resistant: Nrog lub melting point ntawm 173 degree (343 degree F), PP yog ib qho ntawm feem ntau tshav kub-resistant plastics nyob rau hauv lub lag luam. Yog li ntawd, nws yog qhov tsim nyog rau cov ntawv thov uas muaj qhov kub thiab txias, xws li kev ua zaub mov thiab kev siv tsheb.
1.2. Cov khoom siv tshuaj
PP yog non-polar polymer, uas txhais tau hais tias nws tsis heev reactive nrog lwm yam tshuaj. Nws kuj yog non-toxic thiab tsis txhawb kev loj hlob ntawm cov kab mob. Qhov no ua rau nws tiv taus ntau yam tshuaj, suav nrog:
Acids: hydrochloric acid, sulfuric acid, nitric acid, acetic acid
Base: sodium hydroxide, potassium hydroxide, ammonia
Cov kuab tshuaj: dej, cawv, roj av, roj
Tsuas yog cov tshuaj uas paub tias yaj PP yog cov tshuaj muaj zog oxidizing, xws li concentrated sulfuric acid thiab nitric acid.
1.3. Cov khoom ua haujlwm
PP yog ib qho yooj yim rau pwm thiab zoo li. Koj tuaj yeem tig nws mus rau txhua yam, los ntawm cov yeeb yaj kiab thiab cov ntawv mus rau fibers thiab foams. Qhov no ua rau nws muaj kev xaiv zoo rau ntau yam kev tsim khoom, xws li kev txhaj tshuaj molding, tshuab moulding, thiab thermoforming.