TPU / PU Deodorizer

Product Introduction

During the high-temperature processing and synthesis of Thermoplastic Polyurethane (TPU) and Polyurethane (PU), the industry faces two extremely stubborn odor sources: unreacted free isocyanate (TDI, MDI) monomers emit pungent, highly toxic chemical gases; meanwhile, organic amine and tin catalysts used in polymerization cause the finished products to continuously release a nauseating "fishy smell" and chemical stench. Traditional porous physical masks cannot withstand the high shear of elastomer extrusion, and the moisture they carry easily causes TPU degradation and bubbling. Furthermore, polar powders precipitate heavily to the surface, causing severe blooming (whitening) that completely destroys the high light transmittance and skin-friendly touch essential to premium elastomers.

To conquer this industry peak from both thermodynamic and polymer chemistry dimensions, this product pioneers "dual-pathway molecular deconstruction and hydrogen-bond interlock anchoring" technology. Acting as a "molecular scavenger," highly active metal center empty orbitals specifically target highly volatile amines, irreversibly chelating them into odorless macromolecules. Concurrently, a rigid heterocyclic nucleophilic capture sponge responds rapidly in the melt, actively attacking free -NCO monomers to eradicate the toxic gas, cleverly converting them into safe crosslinking points within the polyurethane network. Even more disruptively, this product features a homologous anti-blooming anchoring matrix. Under high heat, it acts as a "double-sided tape," deeply interlocking with the polyurethane macromolecular network via strong hydrogen bonding. This physically envelops and thermodynamically blocks all active deodorizing ingredients from migrating. Even when added in high proportions to ultra-transparent films (PPF), medical catheters, and smart wearable straps, it absolutely will not trigger hydrolytic bubbling or interfere with elasticity, achieving a lasting, ultra-clear, completely bloom-free pure sensory experience.

Appearance

White to off-white, free-flowing fine powder

Deodorizing Principle

• Intramolecular Chelation of Catalyst Odors: Targeting the "fishy smell" from residual amine and organotin catalysts, highly active macromolecular metal complexes seek out volatile odor molecules in the melt. Through strong coordinate bonding via empty orbitals, they instantly convert them into highly stable, non-volatile macromolecular coordinate salts, achieving complete chemical neutralization.
• Nucleophilic Capture & Chain Extension of Free -NCO: To combat highly toxic and pungent free isocyanate monomers, polyfunctional active solid compounds act as "molecular sponges." At extrusion temperatures, their active groups open rapidly to undergo nucleophilic addition with free monomers. This directly consumes and locks the monomers, bridging them as side chains onto the polymer backbone, slightly optimizing the crosslink network while eliminating odors.
• Hydrogen-Bond Network Anchoring (Anti-Blooming): To thoroughly overcome the thermodynamic repulsion that causes polar substances to bloom, a specialized aliphatic diamide macromolecular carrier forms a dense "hydrogen-bond interlock" network with the urethane groups of the substrate. This microscopically dead-locks the reaction centers inside the matrix, creating a long-lasting physical barrier that ensures the material remains highly transparent and completely free of blooming.
• Absolute Water-Free Anti-Bubbling: Utilizes an absolutely water-free nanoscale hydrophobic fumed process. During room-temperature dry blending, it thoroughly disperses the sticky active salts, cutting off the risk of introducing moisture and completely preventing "water bomb" defects (sand holes/bubbles) when TPU extrudes.

Application Areas

• High-Clarity TPU Films/Sheets: Zero-precipitation odor purification for Paint Protection Film (PPF) base films and highly transparent, waterproof, breathable films for sports apparel.
• High-End TPU Injection/Extrusion: Skin-friendly odor removal for smartwatch straps, safe detoxification for medical catheters, and fishy smell elimination for auto interiors and soft-touch electronics overmolding.
• PU Casting/Foaming Systems: Eliminating pungent odors in premium PU furniture sealants and eco-friendly synthetic leather slurries.

Usage Method

• Adding Method: A purely physical dry powder additive. Before TPU secondary granulation, injection, or extrusion, directly physically dry-blend the powder with TPU pellets/powder. Feed into the mixing equipment and blend thoroughly before high-temp processing.
• Mixing Requirements: Requires absolutely no pre-heating or drying. The powder features an excellent anti-caking isolation network; it relies entirely on the strong shear force of the extruder screw to achieve sub-second dispersion within the high-viscosity polyurethane melt.

Reference Dosage

• Recommended Dosage: Add at 0.2% - 0.4% of the total system weight.
• Starting Test Dosage: To accurately evaluate its protection of high-clarity TPU light transmittance, it is recommended to start sampling at 0.2% and gradiently fine-tune based on the specific fishy smell intensity and the resin's curing degree.

Precautions

• MFI (Melt Flow Index) Fine-Tuning Alert: Contains nucleophilic sponges with active end groups. For under-cured TPU materials (with extremely high residual -NCO), this may trigger slight additional molecular chain extension. If testing shows a drop in melt flowability or abnormal increase in product hardness, finely adjust the dosage accordingly.
• Strict Moisture Protection in Dry Blending: TPU is extremely sensitive to free water (producing gas upon contact). This formula uses an absolutely water-free nanoscale isolation process. After opening, the moisture-proof inner bag must be tightly sealed immediately to prevent ambient moisture absorption, which could cause micro-pores or sand holes during processing.