POM (Polyacetal) Deodorizer

Product Introduction

Polyoxymethylene (POM) is a highly crystalline engineering plastic renowned for excellent mechanical properties, widely used in automotive interiors, electronics, and precision machinery. However, its molecular backbone is highly sensitive to heat and oxygen. During standard processing at 190°C-210°C, the resin is prone to "zipper-like" thermal degradation, releasing large amounts of free formaldehyde monomers. This creates a pungent odor, causing downstream products to fail strict low-VOC automotive standards (e.g., VDA 275). Furthermore, normal low-molecular additives tend to migrate to the surface during cooling, affecting dimensional precision.

This dedicated POM deodorizer utilizes revolutionary "nucleophilic addition and compatible anchoring" dual-core technology. Unlike traditional physical absorbers, it contains highly concentrated nucleophilic active groups that accurately trace free formaldehyde in the melt, instantly converting it into a stable macromolecular network for permanent odor fixation. Concurrently, the unique compatibility system firmly anchors the reaction derivatives within the polymer matrix, completely preventing surface migration, maintaining the original mechanical strength, and ensuring flawless dimensional stability.

Appearance

White powder

Deodorizing Principle

• High-Temperature Nucleophilic Capture: Active components rich in strong nucleophilic groups seek out free formaldehyde during melting. They undergo rapid, irreversible nucleophilic addition, converting highly volatile odor gases into non-volatile solid macromolecules.
• Lubricating Phase-Locking & Anchoring: A highly efficient internal lubricant forms a compatible interface, wrapping the solid derivatives and anchoring them deep within the crystalline network. This physically cuts off the migration path to the surface, maintaining mold cleanliness and dimensional accuracy.
• Source Thermal-Oxidative Stabilization: Formulated with hindered phenolic antioxidants specific to polyacetal. They swiftly capture free radicals during initial processing, inhibiting thermal-oxidative chain scission under high shear and drastically reducing initial formaldehyde generation.

Application Areas

• Automotive NVH & Interior Injection: Injection molding of automotive interior parts with strict low-VOC and formaldehyde emission requirements. Examples include low-odor POM seat belt buckles, odorless door handles, speaker grilles, and precision gears, easily meeting VDA 275 standards.
• Precision Machinery & Electronics: High dimensional stability POM gears for office equipment, micro-motor transmission components, performance bearings, and fatigue-resistant structural parts with flawless surface finishes.
• Civil & Premium Medical Devices: Odorless and eco-friendly medical device valves, high-end fasteners, odorless shower fittings, and potable water plumbing components.

Usage Method

• Adding Method: 100% dry powder. Add the deodorizer together with POM resin pellets (including recycled regrind) into the mixing equipment during the blending stage before injection or extrusion.
• Mixing Requirements: Regular medium-to-low speed mixing achieves basic dispersion; however, utilizing a high-speed mixer for a short duration significantly optimizes the powder coating on the resin surface, unlocking the ultimate targeted deodorization and homogeneous dispersion during the melt phase.

Reference Dosage

• Recommended Dosage: Add at 0.5% - 1.0% of the total material weight.
• Starting Test Dosage: It is highly recommended to start testing at 0.8%. Adjustments can be made based on actual residual odor and the proportion of regrind used.

Precautions

• Strict Temperature Control: POM is extremely temperature-sensitive; processing must be strictly controlled between 190°C-210°C. This product captures normal processing formaldehyde but cannot save resin from catastrophic depolymerization caused by severe overheating.
• Storage & Moisture: Keep tightly sealed in a cool, dry place. Moisture absorption can cause silver streaks or bubbles in injection molded parts, so use quickly after opening.