Abstract:

The waxes were modified by addition of polyethylene wax and lauric acid with perfect mixing for lowering drop melting point and strengthening hardness of the waxes. The modification conditions and the effect of additives on the properties of the waxes were investigated. The experimental results show that to prepare the ideal special waxes with low drop melting point and high hardness, the best conditions for modification are 130 ℃, 3h and stirring speed of 600 r/min with addition of lauric acid 8% and polyethylene wax 5%. If polyethylene wax, lauric acid and stearic acid are mixed used as additive (5%:8%:0-25%), the waxes with even lower drop melting point and stronger hardness can be obtained. Based on the results, a relationship of the amount of polyethylene wax, lauric acid and stearic acid with drop melting point as well as penetration (25 ℃) is presented by using SPSS software and linear regression method.

Key words: paraffin, modification, lauric acid, polyethylene wax, stearic acid, drop melting point, penetration