Influence of field natural rubber latex with different ammonia contents and storage period times on mechanical stability time, volatile fatty acid number, gel content and phosphate content of Latex concentrate and skim latex coagulation | อิทธิพลของปริมาณแอมโมเนียในน้ำยางสดและระยะเวลาเก็บรักษาน้ำยางสดต่อค่าความคงตัวเชิงกล ปริมาณกรดไขมันระเหยได้ ปริมาณเจล ปริมาณฟอสเฟตของน้ำยางข้น และการจับตัวของน้ำยางสกิม
2009
Sirinapa Santipanusopon(Prince of Songkla University. Hat Yai Campus, Songkhla (Thailand). Program of Polymer Science) E-mail:[email protected] | Sd-Ad Riyajan(Prince of Songkla University. Hat Yai Campus, Songkhla (Thailand). Program of Polymer Science) E-mail:[email protected]
Influence of ammonia treatment of field natural rubber (NR) latex with different times of storage on the properties of concentrated NR latex and coagulation of skim latex was investigated. Field NR latex was treated with various ammonia amounts as 0.35, 0.60 and 0.80 percent w/w with tetramethylthiuram disulfide and zinc oxide, before being centrifuged to obtain the latex concentrate and skim latex. The residual NH3 in the latex concentrate was 0.16, 0.18 and 0.25 percent w/w and in skim latex was higher at 0.42, 0.60 and 0.81 percent w/w, respectively due to main ammonia removing from filed latex into skim latex part after centrifugation. The influence of field storage times of about 0, 15, 30 and 45 days with different amounts of ammonia on the latex concentrate properties was observed. In general, mechanical stability times (MST), volatile fatty acid number (VFA No.), gel and phosphate content increased with increasing storage times. As ammonia content in skim latex obtained from different storage periods increased, their stabilities also increased, leading to difficult coagulation of skim latex.
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