Chemical Irritants In The Tapping On The Performance Of Concentrated Latex, Vulcanized Latex Film

The particle sizes and particle size distributions of the latex from three tapping systems including the traditional tapping system (A), the current chemical-stimulation tapping system (B) and the excess-stimulation tapping system (C) were determined by using of the laser particle size analyzer. The variation trends of volatile fatty acid number (VFANo.), mechanical stability time (MST) and KOH value along with the storage time were studied according to the National Standards concerned. The contents of elements such as C, H, N, S and so on in the vulcanized latex film from tapping systems A, B and C were compared by using of the Element Analyzer. The mechanical properties, glass transition temperatures, the DMTA of loss angle, loss modulus and elastic modulus as well as the thermal degradation processes of the vulcanized latex films from tapping systems A, B and C were studied by Universal Material Testing Instrument, Dynamic Mechanical Analysis and Synthetic Thermal Analysis. The relationships between the heating rate and thermal degradation temperature (T), degradation percentage were investigated, and the reaction order (n) as well as the apparent activation energy (E) of the degradation processes were calculated. The results were showed as follows: (1) There are no obvious differences in the particle sizes and particle size distributions among the field latex as well as the concentration latex from tapping systems A, B and C, whereas the differences in the particle sizes and particle size distributions between the field latex and the concentration latex from three tapping systems are significant. (2) During the storage period therising speed of the VFANo. and the KOH value of the concentration latex from three tapping systems is C>B>A, while the rising speed of MST of the concentration latex from thee tapping systems is C