1、 Clarify application scenarios and performance requirements
1. Food/Medical Products
Prioritize the use of organotin stabilizers (mercaptan methyl tin), which meet FDA standards and have high transparency, suitable for transparent PVC products, food packaging films, etc; Alternative options include calcium zinc composite stabilizers, which must be certified by REACH, LFGB, and other standards to meet non-toxic migration requirements.
2. Building/Industrial Materials
Hard pipes and plates: It is recommended to use lead salt composite stabilizers (low-cost, high thermal stability), but attention should be paid to their environmental limitations.
2、 Evaluate environmental and safety regulations
1. Environmental compliance:
Lead free and cadmium free stabilizers such as calcium zinc composite or organotin stabilizers are required for export to the European Union or medical fields.
Avoid lead salt stabilizers (high toxicity) and choose products that comply with ROHS and REACH standards.
2. Contact safety: The migration rate of stabilizers should be verified for food packaging materials, and high molecular weight composite formulas should be preferred.
3、 Matching processing technology and lubrication system
1. Adaptation of processing methods
Extrusion/injection molding: Organic tin stabilizers need to be combined with a paraffin wax+calcium stearate lubrication system, and the amount of external lubricant added should be controlled at 0.1-0.5 parts to avoid uneven dispersion;
Rolling/blow molding: Calcium zinc composite stabilizers need to be combined with high-temperature lubricants such as polyethylene wax to prevent excessive melt viscosity;
Process parameter optimization: High temperature processing (above 200 ℃) requires the use of heat-resistant stabilizers (such as organotin, etc.) to reduce the peak torque of the melt by more than 15%. Transparent products need to control the compatibility between stabilizers and resins to avoid precipitation and an increase in haze by 37.
4、 Verification and testing methods
Thermal stability test: Place the PVC sample containing stabilizer at 80 ℃ for 48 hours and observe the color change.
Weather resistance simulation: Evaluate the UV shielding effect through QUV aging test, requiring a tensile strength retention rate of>85% after 5000 hours.
Processing performance verification: Use a torque rheometer to monitor the fluidity of the melt and optimize the ratio of lubricant and stabilizer.
Post time: May-26-2025
