PVC is a difficult polymer material to process. Heat stabilizers and lubricants play an indispensable role in the thermoplastic processing of pvc.
(1) Oxidized polyethylene wax as external internal lubricant :
The commonly used oxidized polyethylene wax is a white powder with a melting point between 100°C and 140°C. Since the oxidized polyethylene wax contains a small amount of polar groups and is partially compatible with PVC, it can play an excellent role in internal and external processes during processing. External lubrication. While promoting plasticization, it can increase melt fluidity, improve mold release and pigment dispersion, improve extrusion efficiency, and endow products with good aesthetics and gloss. The dosage is 0.1-0.5PHR.
(2) Polyethylene wax:
Polyethylene wax is white powder or flake with a melting point of about 100℃-117℃, which is incompatible with pvc. During processing, it exerts external lubrication by forming a slip layer on the surface of pvc and mold. It is suitable for single and twin screw extrusion of rigid PVC, which can reduce the extrusion pressure and energy consumption of PVC. The dosage is 0.1-0.5PHR.
(3) Paraffin Wax
Paraffin wax is usually a white, odorless, odorless waxy solid with a typical melting point between about 46 to 68 °C (115 to 154 °F) and a density of about 900. It is insoluble in water, but soluble in ether, benzene and certain esters. It does not contain polar groups and is incompatible with pvc. It is a typical pvc external lubricant. The general dosage is 0.1-0.8PHR. Paraffin wax has poor transparency and is easy to whiten.
Lubricants will change the surface properties of plastic products due to their surface effects, such as flatness and gloss. At the same time lubricant accumulation on the surface also has a detrimental effect. Release action, slip action, anti-blocking action and anti-slip action.
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