PP (Polypropylene) Deodorizer

Product Introduction

Polypropylene (PP), a widely used semi-crystalline, non-polar polymer, easily undergoes chain scission during high-temperature processing and thermal aging, releasing pungent aldehydes, ketones, and rancid short-chain fatty acids. Recycled PP often carries sulfur and nitrogen stenches from external residues. Traditional deodorizing schemes rely on polar low-molecular lubricants (like EBS, stearic acid), which thermodynamically clash with non-polar PP, being expelled to the surface during cooling to cause disastrous blooming. Furthermore, trace moisture brought by porous carriers vaporizes in the extruder, causing "silver streaks" or "white spots."

Addressing these pain points, this product is a high-performance reactive composite deodorizer tailored for PP and its copolymers. It completely reconstructs the underlying physicochemical logic with a "homologous macromolecular anchoring and nano-hydrophobic isolation" dual-core architecture. It neutralizes acidic derivatives and chemically locks nitrogen and sulfur monomers. Crucially, it introduces a highly homologous polymer compatibilizer that acts as a "chemical bridge" in the melt, firmly anchoring polar deodorizing components within the 3D crystalline network, achieving absolute zero precipitation thermodynamically. The extreme hydrophobic nano-coating network provides absolute water resistance and self-lubricating dispersion, eliminating defects like silver streaks and white spots without disrupting PP's mechanical properties.

Appearance

White powder

Deodorizing Principle

• Empty Orbital Targeted Complexation: The core active component contains macromolecular metal complexes in an electron-deficient state. Upon thermal activation, it actively seeks out free amines and thiols, utilizing empty orbitals to irreversibly coordinate with their lone pair electrons, transforming stench gases into stable networks.
• Lewis Acid/Base Neutralization & Catalytic Cleavage: Embedded highly active transition metal catalytic sites act as potent "acid absorbers," instantly neutralizing short-chain fatty acids from thermal degradation. Their Lewis acid properties catalytically crack stubborn aldehydes and ketones, cutting off the odor regeneration chain.
• Homologous Macromolecular Anchoring (Zero Bloom Mechanism): Introduces a macromolecular interfacial compatibilizer with highly polar reactive ends and polyolefin long chains. The polar groups bite into the polar salts, while the non-polar chains undergo deep molecular entanglement and co-crystallization with the PP matrix, thoroughly blocking migration to the surface.
• Nano-Hydrophobic Isolation: An outer dense nanoscale hydrophobic network provides absolute water resistance, eliminating the risk of moisture-induced "silver streaks." Nanoparticles act as bearings between powder particles, isolating sticky active components and ensuring ultimate dispersion during low-speed dry blending.

Application Areas

• Automotive Low VOC Interiors: PP dashboards, door panels, pillar trims, and AC casings (homo-PP, co-PP, and talc/glass-filled PP). Lowers VOC emissions to meet automaker standards.
• Appliances & Daily Injection Molding: Washing machine inner tubs, dark appliance bases, and food-contact packaging. Ensures clean surfaces and no residual odors.
• High-Value Recycling: Demanding applications for bulk recycled PP pelletizing and PP/PE blended recycling.

Usage Method

• Addition Method: A pure physical dry powder additive. Add along with resin pellets or color masterbatches during the pre-blending stage of modified pelletizing, extrusion, or injection molding.
• Mixing Requirements: Features excellent self-lubricating anti-caking properties, requiring no high-speed shear mixing. Tumble mix in a standard V-blender or drum mixer at room temperature for 5-10 minutes until the powder evenly coats the pellets.

Reference Dosage

• Standard New PP (Mild Odor): 0.3% - 0.5% of total weight.
• Degraded/Complex Odor Recycled PP: 0.6% - 0.8% of total weight.
• Starting Test Dosage: It is recommended to start testing at 0.5%, adjusting based on terminal testing standards (e.g., auto VOC limits) and surface finish requirements.

Precautions

• Moisture-Proof Storage: Despite nano-hydrophobic treatments, seal the aluminum foil inner bag tightly after opening. Prolonged exposure to high humidity and dust may affect its ultimate flowability.
• Processing Temperature: Keep processing temperatures between 170°C - 230°C to perfectly activate the co-melt anchoring effect of the macromolecular compatibilizer.