Uv Absorber 234 Formulation Guide For Polycarbonate
- [Synthetic Profile]: High molecular weight benzotriazole structure ensures low volatility.
- [Procurement Logic]: Factory-direct tonnage quantities with verified COA.
- [Market Viability]: Compliant with global safety standards for industrial use.
Polycarbonate resins are engineered for high-impact resistance and optical clarity, yet they remain susceptible to photodegradation when exposed to prolonged sunlight. To maintain mechanical integrity and aesthetic value in outdoor applications, formulators require robust stabilization systems. This formulation guide details the integration of UV-234 (CAS 70321-86-7) into polycarbonate matrices, ensuring optimal performance during high-temperature processing and end-use weathering.
As a premier global manufacturer, NINGBO INNO PHARMCHEM CO.,LTD. supplies this high-performance additive with consistent batch-to-batch purity. The following technical breakdown addresses critical parameters for R&D chemists, procurement specialists, and executive stakeholders seeking reliable supply chains and regulatory compliance.
Dosage Rates for PC Resins
Achieving the balance between cost-efficiency and protection requires precise loading levels. For most polycarbonate applications, the recommended concentration of this Benzotriazole UV Absorber ranges between 0.1% and 1.0% by weight. Lower dosages within this spectrum are typically sufficient for indoor applications or thin-wall components, while exterior automotive parts or construction profiles may require higher loading to maximize service life.
From a synthesis perspective, the compatibility of UV-234 with polycarbonate is excellent, minimizing the risk of blooming or plate-out during extrusion. When evaluating a drop-in replacement for existing stabilization packages, it is crucial to verify that the additive does not interfere with other components such as hindered amine light stabilizers (HALS) or antioxidants. Synergistic effects are often observed when combining UV absorbers with HALS, providing a broader spectrum of protection against both UV radiation and thermal oxidative degradation.
For procurement teams, securing material at the correct specification is vital. Sourcing from a verified supplier ensures that the technical data sheet aligns with actual production capabilities, reducing the risk of formulation failures due to impurity profiles.
Thermal Stability During Processing
Polycarbonate processing often involves high shear and elevated temperatures, typically exceeding 280°C. A critical advantage of UV-234 is its high molecular weight, which contributes to low volatility and exceptional thermal stability. Unlike lower molecular weight stabilizers that may evaporate or degrade during molding, this additive remains intact within the polymer matrix.
For process engineers, this thermal resilience translates to reduced equipment fouling and consistent output quality. The additive withstands the rigors of injection molding and extrusion without significant decomposition, ensuring that the final part retains its designed UV protection levels. This stability is particularly important for thick-walled components where heat history is prolonged.
When sourcing high-purity 6-bis(1-methyl-1-phenylethyl)phenol, buyers should prioritize manufacturers who can demonstrate thermal gravimetric analysis (TGA) data confirming stability at processing temperatures. This ensures that the additive performs as intended without releasing volatile byproducts that could compromise the clarity or mechanical strength of the polycarbonate.
Preventing Yellowing in Clear Parts
One of the primary failure modes for polycarbonate in outdoor environments is yellowing, caused by the formation of chromophores during UV exposure. UV-234 effectively absorbs harmful radiation in the 270-380 nanometer range, dissipating the energy as harmless heat before it can damage the polymer chains. This mechanism preserves the initial color and transparency of clear parts, such as headlamp lenses, glazing, and electronic housings.
Executive decision-makers should note that extending the service life of components through effective stabilization reduces warranty claims and replacement costs. By preventing brittleness and discoloration, manufacturers can maintain brand reputation and customer satisfaction in demanding sectors like automotive and construction.
Furthermore, regulatory compliance is streamlined when working with established suppliers. NINGBO INNO PHARMCHEM CO.,LTD. ensures that all shipments meet international safety standards, providing necessary documentation such as REACH and TSCA compliance statements upon request.
Technical Specifications
| Parameter | Specification |
|---|---|
| Chemical Name | 2-(2H-Benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol |
| CAS Number | 70321-86-7 |
| Molecular Formula | C30H31N3O |
| Molecular Weight | 453.59 g/mol |
| Appearance | White to Off-White Powder |
| Melting Point | 106-108 °C |
| Purity (HPLC) | ≥ 98.0% |
| Volatile Matter | ≤ 0.5% |
To maintain competitive advantage, securing a stable supply of critical additives is essential. For details regarding bulk price structures or to request a batch-specific COA, SDS, or sample, please contact our technical sales team for a batch-specific COA, SDS, or bulk pricing quote.