Abstract
In order to stabilise recycled cutting waste of PVC coated glass fiber fabric (hereafter “PVC-GF”), a composite material having PVC as a matrix combined with hydrotalcite (hereafter “HT”) and zinc stearate (hereafter “ZS”) was prepared. The mechanical properties were measured and the inhibition effect of generating hydrogen chloride gas in heating was investigated.
Cutting waste of PVC-GF was subjected to heated compression molding under various conditions to prepare specimens, and the bending strength was measured. The results showed that as the temperature increased from 120°C to 150°C and as heating the time was extended from 20 minutes to 45 inutes, the bending strength was greatly increased. In bending deformation, glass fibers contained in the specimens showed an effective reinforcing effect.
The specimens combined with HT and ZS were obtained by injection molding. The starting time of generating hydrogen chloride gas in heat was investigated for the injection molded specimens. The result showed that the addition of both HT and ZS could greatly retard the time until hydrogen chloride gas was generated proving the benefits. Furthermore, the effect of UV irradiation on hydrogen chloride gas generation was investigated. It was clear that the starting time of hydrogen chloride gas generation was delayed by UV irradiation for the specimens with a relatively large amount (5-10 phr) of HT, as opposed to little change for the specimens with a relatively small amount (0-0.5 phr) of HT. This indicates that HT addition is effective for material recycling of PVC products used outdoors.
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