PHENODUR® PR 401/72B

1 of 29 products in this brand
PHENODUR® PR 401/72B B is an uncured, unplasticized phenolic resin designed for various applications. It functions as a crosslinking agent and is recommended for coating the interior and exterior surfaces of packaging containers and cans. Additionally, it serves as a high-adhesion, chemically resistant protective coating for apparatus, vessels, pipelines, etc. This resin is suitable for heat-curing phenolic/epoxide resin combinations, phenolic/polyvinylbutyral combinations, and physically drying paints with resistance to fuel and oil.

Functions: Crosslinking Agent

Chemical Family: Phenols & Phenolics

Technical Data Sheet

Knowde Enhanced TDS

Identification & Functionality

Chemical Family
CASE Ingredients Functions
Technologies

Features & Benefits

Distinguishing Features

Films based on Phenodur PR 401 are almost colorless. The Phenodur grades suitable for combination with epoxide resins are PR 217, PR 285, PR 401, PR 722, PR 723 and PR 897.

Applications & Uses

Properties and Uses

Can coating

After stoving, combinations of 20 - 40 % Phenodur PR 401 and 80 - 60 % Beckopox EP 307 or EP 309 (each calculated on the solids content) yield high-adhesion, chemically resistant films with good flexibility for the internal and external coating of cans, tubes and other packaging containers used in the food and luxury commodity industries.

Chemically resistant protective coatings

Phenodur PR 401 can be used as sole binder in high resistant stoving enamels. The stoved films are comparatively brittle and can only be used on rigid substrates. Polyvinyl butyrals can be employed as plasticizing agents. The main products suitable for combination with epoxide resins is Phenodur PR 401. Since plastification reduces the general resistance of the stoving enamel coatings against chemicals, the mixing ratios have to be adjusted according to the resistance and film qualities required. Epoxide resin combinations with a predominant phenolic resin constituent have proved successful for coatings exposed to acid agents. Good film flexibility and resistance to alkalis are achieved by using rather large amounts of epoixide resin. Systems being employed for protective coatings of this type can be pigmented with inert fillers and pigments. In multi layer coatings, the first coats applied are not fully cured, but dried at relatively low temperatures only. The coating system as a whole is cured together with the last coat applied (e.g. 30 min/180 - 210 °C). Coatings based on this principle are used for chemical resistant interior linings of vessels, apparatus and pipelines in the chemical and allied industries.

Processing

Preparing the resin solution and diluents

The phenolic resin solutions are mixed with the other resin solutions at room temperature. Glycol ethers, esters, diacetone alcohol and higher ketones are suitable as solvents. Aromatic hydrocarbons can be used as thinners. Phenodur PR 401/epoxide resin combinations can also be influenced to a considerable degree in their film properties by a preliminary precondensation process. The precondensation of the two components in their solution has to be carried out in closed containers, under reflux condenser and constant agitation. At a temperature of 110 - 120 °C this reaction is completed after about 2 hours. Precondensation in this way effects flow properties and lacquer stability.

Stoving conditions

Depending on the application and film thickness, stoving condition lie between the limits of 30 to 10 minutes at 180 to 210 °C. Higher temperatures may cause a loss of flexibility. For relatively thin films, as applied for can coating, 10 to 15 min/190 - 200 °C is sufficient.

Catalysis

The use of acid cataysts as Additol XK 406 is recommended.

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Iodine Color Numbermax. 2
Density (20°C)approx. 1.03g/cm³
Non-Volatile Matter70 - 74%
Dynamic Viscosity200 - 1000mPa.s
Flash Point34°C

Technical Details & Test Data

Dilutabilty

solvent naphtha

methoxypropyl acetate

white spirit

ethyl acetate

acetone

methoxypropanol

methyl ethyl ketone

ethanol

methyl isobutyl ketone

butanol

cyclohexanon

xylene

butyl acetate

unlimited dilutability

unlimited dilutability

very limited or no dilutability

unlimited dilutability

unlimited dilutability

unlimited dilutability

unlimited dilutability

unlimited dilutability

unlimited dilutability

unlimited dilutability

unlimited dilutability

unlimited dilutability

unlimited dilutability

 

Packaging & Availability

Regional Availability
  • Africa
  • Asia Pacific
  • Europe
  • Latin America
  • North America

Storage & Handling

Shelf Life
2 years
Storage and Handling

At temperatures up to 25 °C storage stability packed in original containers amounts to at least 730 days.