ผลของสารเคมีต่อการจับก้อนของน้ำยางธรรมชาติ / ประสพชัย รัตนเหล็กไหล = Effect of chemical reagents on coagulation of natural rubber latex / Prasopchai Rattanaleklai
In general, the popular chemical reagent for natural rubber latex stabilization to prevent coagulation is ammonia. However, tapping latex is punctured and collected in a plastic bag. If the collection process can be prolonged, the labour cost will be reduced. The objective of this study is to identify chemical reagents for ammonia replacement using in conjunction with ammonia in low quantity. Chemical reagent used in this experimental work are ammonia, triclosan, polyvinyl alcohol, PONPE-9 (poly-oxy nonylphenol ethoxylated) and propylene glycol. These chemical reagents are added to fresh field latex. From the experimental results, it was found that triclosan, polyvinyl alcohol and propylene glycol combined with ammonia (< 1.33 phr.) could preserve the latex for 50-80 hour with a kind of chemical reagent and proper concentration. When the low ammonia concentration was used alone then the preservation was effective for only 30-40 hour.
