Thesis (M.Sc.)--Chulalongkorn University, 1999

Ca/Zn stabilizer was used in PVC color masterbatch for both of PVC bottle and PVC cable compound instead of the lead and tin stabilizer in order to solve the sulfur staining and the melting problem. The first part of this work concerns a type and an amount of PVC resin, stabilizer, co-stabilizer, plasticizer, and lubricant that effect the heat stability, the physical properties and the electrical property. In the second part, the effect of varied amounts of a pigment at 10, 20 and 30 phr on processing was investigated. Finally the physical properties and the electrical property of the blending with the master batch at the ratio of 100:1, 100:3 and 100:5 were investigated. It was found that the optimal formula is composed of the PVC resin which K value 56, the di-octy1 phthalate, the oxidized soybean oil, the Ca/Zn stabilizer and the ester of fatty acid at 100,25,5,4, and 0.3 phr respectively. In the second part, it was found that there is no effect onthe processing when the amount of the pigment is less than 20 phr but at 30 phr, the temperature profile is increased by 3 ํC. Finally the physical properties and the electrical property of the cable blended with the masterbatch at ratio 100:5 show no significant effect while the impact strength of the blending in the bottle has a tendency to decrease by 15%. However the impact strength is in the range of acceptance for a PVC bottle which the size is not larger than 500 ml.