CHLUMIAO®PDDP CAS 25550-98-5

Phenyl diisodecyl phosphite

CAS No. : 25550-98-5

Molecular weight: 438

Application Instructions

An arylalkane phosphite antioxidant, suitable for a variety of polymers, including polycarbonate, coatings, polyolefins, ABS and PET fibers. It can provide good color improvement and thermal stability both during processing and in the later stage. As an efficient auxiliary stabilizer and chelating agent, when used in hard or soft PVC materials, it can enhance the brighter, more uniform color and transparency of PVC materials, and improve the thermal stability of PVC. Suggested addition amount: 0.1-2.0%

Description

Quality index

Product appearance: Colorless and transparent liquid
Chromaticity (Pt-Co) : ≤50
Density (25℃) : 0.942-0.952
Refractive index (25℃) : 1.4770-1.4820

Packaging specification

180KG iron drum

Application

PVC, ABS, PU, PAM

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Antioxidant PDDP Application scenarios

1. High-Efficiency Thermal Stabilizer for PVC:
Compatible with rigid/flexible PVC, it inhibits thermal degradation and discoloration during processing, improving transparency and weather resistance. Commonly used in food-grade rigid sheets, medical tubing, heat-shrink films, and agricultural films. Often compounded with barium-cadmium and calcium-zinc metal soaps, typically at 0.3%-1.0%.

2. Processing Protection for Polyolefins (PE/PP):
Inhibits thermal oxidative degradation of PE and PP during high-temperature processing such as extrusion and injection molding, reducing yellowing and mechanical property decline. Suitable for films, pipes, and injection molded parts. Synergistically enhanced when compounded with hindered phenolic antioxidants.

3. Color Retention for ABS/HIPS Resins:
Prevents thermal oxidative degradation of ABS and HIPS during high-temperature processing, improving yellowing and mechanical degradation, enhancing the appearance and long-term stability of electronic casings, automotive interiors, and other products.

4. Polyurethane (PU) Anti-yellowing:

Effectively inhibits phenolic yellowing and NOₓ yellowing in PU, improving thermal stability. Used in PU foams, elastomers, adhesives, etc., such as automotive seats, building insulation foams, sealants, etc. The addition amount in polyether polyol polymerization is approximately 0.5% – 1.5%.

5. Synthetic Rubber Anti-aging:

Compatible with styrene-butadiene rubber (SBR), nitrile rubber (NBR), etc., inhibiting thermal oxidation during high-temperature mixing and vulcanization, improving the durability of elastic threads, seals, hoses, etc. The addition amount is typically 1.0% – 2.0%.

6. Coatings and Adhesive Systems:

Added to automotive coatings, industrial anti-corrosion coatings, polyurethane adhesives, etc., enhancing the weather resistance and heat resistance of coatings and adhesive layers, preventing oxidation, yellowing, and chalking. Suitable for various industrial and civil coatings and structural adhesives.

7. Engineering Plastics Processing Stabilization:

Used in polycarbonate (PC), polyester, polystyrene (PS), etc., it is compounded with primary antioxidants to improve processing and usage stability, suitable for electronic and electrical components, textile fibers, etc.

8. Composite Stabilizer Compounding:

Used to prepare liquid and paste-like composite stabilizers, it produces a synergistic effect when compounded with primary antioxidants and UV absorbers, enhancing the overall anti-aging effect, suitable for various polymer material processing systems.

9. Lubricating Oil Antioxidant and Anti-wear:

As a lubricating oil additive, it possesses both antioxidant and anti-wear properties, inhibiting oil oxidation and deterioration, reducing equipment wear, and is suitable for industrial gear oils, hydraulic oils, etc.

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