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Antioxidant H/DPPD

Executive standard: Q/YTH001-2011
CAS NO. 74-31-7
English abbreviation: DPPD
English alias: N, N-diphenyl-p-phenylenediamine
Chinese alias: N,N’-二苯基对苯二胺

Product parameters

Executive standard: Q/YTH 001-2011

Chinese alias: N,N’-二苯基对苯二胺

English alias: N, N-diphenyl-p-phenylenediamine

English abbreviation: DPPD

CAS RN: 74-31-7

1. Physical and chemical properties:

1.1 Molecular formula: C18H16N2

1.2 Molecular weight: 260.34

1.3 Structure formula:

Structure formula

1.4 Specific gravity: 1.2

1.5 Solubility: Dissolve in benzene, ether and acetone. Dissolve slightly in ethanol. Insoluble in water.

1.6 Boiling point: 220-225℃, 0.5mmHg

1.7 Stability and reactivity: Flammable. When it’s exposed to air or sunlight, the product will be oxidized and change its color. When contacted with hot dilute hydrochloric acid, it becomes green.

1.8 Properties: N,N'-Diphenyl-p-phenylenediamine is used as an antioxidant and stabilizer for rubber, petroleum oils and feedstuffs. It is also used as a polymerization inhibitor and a retardant against copper degradation.It is a chemical intermediate to make dyes, drugs, plastics and detergent additives.

2. Technical indexes:

Item Index
Refined 1stgrade 2ndgrade
Initial melting point, ≥140.0 ≥135.0 ≥125.0
Ash content, %(m/m) ≤0.40 ≤0.40 ≤0.40
Decrement by heating, %(m/m) ≤0.40 ≤0.40 ≤0.40
Remainder through sieving (100 mesh), % (m/m) ≤1.0 ≤1.0 ≤1.0
Appearance Grey or brown powder

3. Application: Antioxidant H can be used as the antioxidant in solid propellant to improve the storage stability of the product. It has been used for those natural, styrene-butadiene, acrylonitrile-butadiene, butadiene, butyl, hydroxyl, polyisoprene rubber to possess performance such as good flex life and crazing for enhancing the tensile modulus, strengthening the defending function to hot-oxygen , ozone and some harmful metals such as copper, manganese with not influence on vulcanization of those rubbers. It can resolve aging problem existing in the deep-color rubber products while antioxidant H is used together with antioxidant D. Moreover, it can be also used as the hot-oxygen stabilizer for those engineering plastics such as polyethylene, polypropylene, polyamide, polyformaldehyde and etc to improve their climate-resisting performance. The reference dosage is 0.2-0.3%.

Use: Oxidation is an important limiting factor in all thermoplastics and thermosetting resins. Its effects include adverse colour change, loss of flexibility, loss of tensile strength and elongation, reduced impact resistance, cracking and other surface deterioration. Oxidation can also affect the molecular weight of a polymer, which in turn affects its other properties.
The oxidation of latex and rubber compounds can have different effects, depending on the type of polymer involved. Problems include adverse colour changes, loss of flexibility, loss of tensile strength and reduced impact resistance, ageing, cracking and other surface deterioration.
Industrial antioxidants provide critical performance and protection in applications such as rubber and plastics, defending polymers from oxidative degradation due to heat, light, gas fading, peroxides, shear, and other dynamic factors.
Antioxidant H provides superior long-term thermal stability and color stability; is effective in film, fiber, and thick cross-section articles; and performs well in filled systems.
Furthermore, Antioxidant H is also used in the production of colorless stabilized polyolefins as well as PVC and PVB films.
DPPD antioxidant H is widely used in most natural and synthetic lattices and rubbers.

4. Safety instructions: Toxic. Rubber gloves, respirator and eye protection must be used during operations in case of skin contact, eyes contact..

5. Packing: Woven bag lined with plastic bag, net weight 20 kg/bag.

6. Storage: Stored in a cool, ventilated place. The shelf life is 12 months after manufacturer date. It is still available if retest result is qualified after expire date

7. Transportation: Avoid rain, exposure, high temperature.


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