Material Analysis
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Large impact strength fluctuation of MBS-modified PVC
Problem Phenomenon
Impact strength of MBS-modified PVC fluctuates greatly, with obvious batch-to-batch differences and unstable toughening effect
Cause Analysis
Interfacial bonding of the MBS core-shell structure changes at different processing temperatures
PVC/MBS ratio fluctuation
Processing temperature deviates from the recommended range (180-220°C)
Uneven MBS particle size distribution
PVC base resin molecular weight fluctuation
Solution
Stabilize the PVC/MBS ratio
Strictly control processing temperature according to the 180-220°C range
Select MBS with uniform particle size distribution
Stabilize PVC base resin molecular weight
Optimize the mixing process to ensure MBS dispersion
Key Takeaway
MBS toughening of PVC needs stable ratio and processing conditions
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