The role of compound lubricant in the extrusion of rigid PVC pipes
Common rigid PVC pipe formulations:
Component addition amount
PVC resin :100.0 phr
Tin Stabilizer :0.30 – 1.00 phr
Paraffin :0.60 – 1.50 phr
Polyethylene Wax :0.00 – 0.30 phr
Calcium stearate :0.40 – 1.50 phr
Calcium carbonate :0.00 – 5.00 phr
Titanium dioxide :0.50 – 3.00 phr
Processing aid :0.00 – 2.00 phr
In the formula, we can see the figure of paraffin wax and polyethylene wax. As a lubricant, paraffin wax has been used in rigid PVC for more than 40 years, but the softening point of paraffin wax is relatively low, paraffin wax is volatile during high temperature processing, and the dispersibility is not good, which will lead to the bright effect of the PVC pipe. Poor, and there will be many stains on the surface, and the anti-sticking effect is poor. Therefore, it is necessary to add polyethylene wax to neutralize the lubricating effect of paraffin wax.
Polyethylene wax used for PVC pipes has the following functions:
Prevents rigid PVC from degrading when heated and sheared.
Increase mobility and control fusion
In the process of pipe production, the lubrication effect will be adjusted according to the plasticization state of the material.
Promote the dispersion of fillers, improve the surface gloss of the pipe, and make the pipe feel smooth
The key to the advancement of rigid PVC pipes to high quality
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