المشاكل والحلول

إجابات عملية على التحديات الشائعة في مواد البلاستيك

PVA hardness too high

Material Analysis PVAhigh hardnesscrystallinityfiller amountplasticizer

Low PVA elongation at break

Material Analysis PVAelongation at breakmolecular weightorientation controlcrosslinking degree

Fast PVA thermal aging

Thermal aging is caused by thermal oxidation; improving the antioxidant system is the key

Material Analysis PVAthermal agingthermal oxidationantioxidanthigh molecular weight

Fast PVA UV aging

Fast UV aging is caused by photo-oxidation; UV absorber and HALS are the key

Material Analysis PVAUV agingUV absorberHALSradical scavenging

Unstable PVA shrinkage rate

Material Analysis PVAshrinkage ratebatch differencetemperature control stabilitycrystallization consistency

Poor PVA weather resistance

Material Analysis PVAweather resistanceUV absorberHALSphoto-oxidation

Dimensional change of PVA products during long-term storage

Material Analysis PVA dimensional stability physical aging annealing secondary crystallization slight crosslinking

Poor interfacial bonding between PVA and filler

Material Analysis PVA filler interfacial bonding coupling agent compatibilizer filler dispersion

Poor resilience of PU flexible foam

PU flexible foam resilience is determined by isocyanate index and catalyst formulation

Material Analysis PU flexible foam resilience isocyanate index catalyst foam density

Low flexural modulus of PU

Material Analysis PU flexural modulus rigid filler nucleating agent crystallinity

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