PU (poliuretan) in PET (polietilen tereftalat) pene kažejo pomembne razlike v več vidikih:
Kemična struktura in sestava
PU foam is a polymer material synthesized through the reaction between isocyanates and polyols. Its molecular structure contains carbamate groups, endowing it with high design flexibility. By adjusting the proportions and types of raw materials, PU foams with diverse performance characteristics can be produced. In contrast, PET foam is based on Polietilen tereftalat, ki ga dobimo z esterifikacijo in polikondenzacijo tereftalne kisline in etilen glikola . kot termoplastično poliestrsko peno, ima navadno strukturo molekularne verige, ki zagotavlja visoko stabilnost .}}}}}}
Fizične lastnosti
Density and Hardness:PU foam has a broad density range, spanning from a few kilograms per cubic meter to several hundred kilograms per cubic meter, and can be fabricated into soft, semi - rigid, and rigid forms. Soft PU foam, characterized by excellent elasticity and flexibility, is commonly applied in sofas, mattresses, and other cushioning products. Rigid PU foam, with its high hardness and strength, is well - suited for thermal insulation applications. PET foam, on the other hand, has a relatively low density, typically ranging from 30 to 150 kg/m³. It offers high hardness and strong rigidity, providing reliable structural support while maintaining a lightweight Narava .
Termična izolacija in zaostalost za plamen: PU pena, zlasti toga sorta, kaže odlične toplotne izolacijske lastnosti zaradi nizke toplotne prevodnosti, zaradi česar je priljubljena izbira za gradnjo in industrijsko izolacijo ., vendar je običajna puha pena vnetljiva in zahteva dodajanje ognjenih uporov {1}, ki jih je treba dodati v požaru {1}, ki jih je treba dodati požar}, ki jih je treba dodajati požar}, ki jih je treba dodajati požarni odpor {1}, ki jih je treba dodajati požar. Izolacijske zmogljivosti in sama po sebi kažejo dobro zaostalost plamena . Zlasti ne proizvaja kapljic pri gorenju in poveča celotno varnost .
Chemical Resistance and Weather Resistance:PU foam shows good oil resistance but may degrade when exposed to strong acids, alkalis, and other aggressive chemicals. Prolonged exposure to ultraviolet radiation, high temperatures, and humidity can also lead to performance deterioration. In contrast, PET foam boasts exceptional chemical corrosion resistance, effectively withstanding common acids, Alkalis in organska topila . Njegova vrhunska vremenska odpornost omogoča ohranjanje stabilnih zmogljivosti v različnih podnebnih razmerah .
Tehnologija obdelave
PU foam is typically manufactured using the foaming process. This involves mixing raw materials and incorporating a foaming agent, allowing the mixture to react and expand within a mold or designated space. Process parameters can be fine - tuned to control the foam's structure and properties. PET foam, conversely, is mainly produced through Ekstrudiranje ali kompresijsko oblikovanje . Surovina PET se najprej segreje v staljeno stanje in nato oblikuje v penaste liste ali izdelke prek kalupov . Ta postopek zahteva natančen nadzor nad temperaturo in tlakom .
Prijavna polja
PU foam enjoys extensive applications. Soft PU foam is utilized for cushioning and filling in furniture, automotive interiors, and similar products. Rigid PU foam finds use in building wall insulation, refrigerator cold storage insulation, and other thermal insulation scenarios. PET foam, by contrast, is predominantly employed in sectors S strogimi zahtevami za materialno trdnost, dimenzijsko stabilnost in zaostalost plamena, kot so proizvodnja rezil vetrne turbine, vesoljske sestavljene konstrukcijske komponente in notranjo hitrostjo hitrosti vlakov ., hkrati pa zagotavlja zmanjšanje teže in varnost .