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What are the requirements for the synergistic ratio of components in the preparation of Polypropylene Flame Retardant Compound?
This material is a composite flame retardant material, with homopolymer polypropylene (PP, melt flow rate 12g/10min) as the matrix, and flame retardant (ammonium polyphosphate APP-2), carbon source (pentaerythritol), synergist (melamine) and lubricant (calcium stearate) are mixed in a ratio of 55:25:15:5. When mixing, first put PP into a high-speed mixer (speed 800 rpm), heat it to 100℃, then add flame retardant and additives in turn, and mix for 15 minutes until uniform. Granulate it through a twin-screw extruder (zone 1 170℃, zone 2 185℃, zone 3 200℃, zone 4 190℃), the screw speed is 350 rpm, and cut into 3×3mm cylinders, that is, Polypropylene Flame Retardant Compound. Its density is 0.98g/cm³, melt flow rate is 9g/10min, oxygen index is 30%, and flame retardancy reaches UL94 V-0 level (1.6mm). This process is like mixing food with a spoon. If the proportion of components is improper, the flame retardancy or mechanical properties will be damaged. It needs to be precisely controlled so that the components can work together to provide a one-stop flame retardant solution for PP products.
How to balance the mechanical properties and processability of Polypropylene Flame Retardant Compound?
This product has a tensile strength of 28MPa, an elongation at break of 35%, and a simply supported beam impact strength of 4.5kJ/m², which is about 15% lower than that of pure PP. However, by optimizing the ratio of additives (adding 0.5% maleic anhydride grafted PP), the impact strength is increased to 5.2kJ/m². The melt flow rate is 9g/10min, which is suitable for various processing methods such as injection molding and extrusion. The mold temperature during injection molding is 50℃, the holding pressure is 60MPa, and the product has no shrinkage marks. When used for sheet extrusion, the pulling speed is 2m/min and the sheet flatness error is less than 0.2mm. It has good low-temperature toughness and retains 80% of the impact strength at -20℃, making it suitable for cold regions. Although the amount of flame retardant added is 45%, the surface treatment technology is used to make the dispersed particle size uniformly distributed at 20-30μm, reducing the impact on mechanical properties and achieving a balance between flame retardancy and processing and use performance.
How is the weather resistance and thermal stability of Polypropylene Flame Retardant Compound?
After 1000 hours of QUV aging test (340nm lamp, irradiance 0.71W/m², 8 hours of illumination at 60℃/4 hours of condensation at 50℃ cycle), the tensile strength retention rate is 85%, and the color change ΔE<3, which is much better than the 60% retention rate of non-flame retardant PP. Thermogravimetric analysis shows that the weight loss rate is only 3% at 300℃ and 50% at 450℃, which is 60℃ higher than the thermal decomposition temperature of pure PP. After being placed in a 120℃ oven for 30 days, the flame retardant performance still reaches V-0 level, and the oxygen index decreases by less than 1%. For outdoor products (such as electric meter boxes), after 1 year of exposure, the surface is not powdered, and the impact strength is retained by 75%. The added antioxidant (1010 and 168 are compounded at 1:2) can inhibit thermal oxidation aging, and carbon black (2%) enhances UV resistance, so it is suitable for multiple indoor and outdoor scenes, with stable and long-lasting performance.
What are the advantages of Polypropylene Flame Retardant Compound in electrical appliance housing?
This product is used for the outer shell of the air conditioner, with a thickness of 2mm, flame retardant up to UL94 V-0 level, and does not ignite in the glow wire test at 750℃, which meets the IEC 60695 standard. After molding, the surface gloss of the shell is 60GU, scratch-resistant (pencil hardness 2H), and there is no discoloration after 500 times of alcohol wiping. In the chemical resistance test, it was exposed to detergent and lubricating oil for 24 hours, without swelling, cracking, and the mass change rate was less than 0.3%. Compared with traditional brominated flame-retardant PP, the smoke density rating (SDR) is 40, and the toxicity index is reduced by 50%, which complies with the EU RoHS directive. Its processing cycle is 10% shorter than that of ordinary flame-retardant PP (injection molding cycle 30 seconds), which is suitable for large-scale production. Therefore, it replaces traditional flame-retardant materials in the field of electrical housing, combining safety, environmental protection and economy.
What are the specifications for storage and secondary processing of Polypropylene Flame Retardant Compound?
This product is packaged in moisture-proof kraft paper bags, 25kg per bag, lined with PE film, and the pallet stacking height does not exceed 10 bags. It is stored in a ventilated warehouse with a temperature of less than 35℃ and a relative humidity of less than 60%. The shelf life is 12 months. It does not need to be dried before secondary processing and can be used directly. If it absorbs moisture (water content > 0.15%), it can be dried at 80℃ for 2 hours. During injection molding, other materials remaining in the barrel need to be cleaned up to prevent contamination from affecting the flame retardant properties. When compounding with glass fiber (10-30%), the processing temperature needs to be increased by 5-10℃ to make the melt fluidity adapt to the addition of glass fiber and enhance the bending strength of the product (up to 80MPa). After crushing, the scraps can be mixed with 20% recycled materials, and the performance reduction does not exceed 5%, which meets the requirements of the circular economy. The processing workshop must be well ventilated to avoid dust accumulation, and the operators must wear dust masks to ensure production safety.