KN3366F is a hydroxyl acrylic resin for automotive coatings developed for automotive interior parts and one-coat high-gloss PU coating systems. It combines high gloss, excellent leveling, good adhesion on ABS+PC substrates, boiling-water resistance, and broad compatibility.
Therefore, KN3366F is suitable for coating formulators that need both premium surface appearance and reliable film performance in plastic interior applications.
High Gloss and Excellent Leveling
Surface appearance is an important requirement for automotive interior coatings.
KN3366F provides high gloss and good leveling performance. In the reference coating system, the 60° gloss reached 100, while the cured film was described as smooth, flat, and free from cratering.
In addition, the reference coating showed good fullness and high distinctness of image, helping formulators create a refined high-gloss finish.
Strong Adhesion on ABS+PC
ABS and PC are widely used in automotive interior components, so adhesion performance is critical.
KN3366F provides good adhesion on ABS+PC substrates. The reference test also recorded 100% cross-cut adhesion under the stated conditions.
Moreover, the resin offers good boiling-water resistance, making it suitable for coating systems where adhesion and resistance performance are both important.
Broad Compatibility for Formulation Flexibility
KN3366F offers broad compatibility with several Kenxon resin grades and common coating solvents.
The TDS lists compatibility with:
- KN6652P
- KN6532P
- KN6650P
- KN6701P
- KN6565P
- KN7530P
It also shows solubility or compatibility with solvents including xylene, trimethylbenzene, butyl acetate, cyclohexanone, n-butanol, isobutanol, ethylene glycol monobutyl ether, and ethylene glycol ethyl ether acetate.
As a result, formulators have greater flexibility when adjusting resin combinations, solvent balance, and application viscosity.
Typical Technical Properties
| Property | Specification |
|---|---|
| Composition | Acrylic copolymer |
| Appearance | Clear and transparent |
| Viscosity at 25°C | 2–4 Pa·s |
| Acid Value | 5–10 mg KOH/g |
| Solvent | BAC |
| Color | ≤2 Fe-Co |
| Solid Content | 71 ± 2% |
| Hydroxyl Value | 100 |
The relatively high solid content provides an important technical reference when designing PU coating formulations.
Reference 2K PU Coating System
The technical document provides a two-component reference formula using KN3366F in Part A and N3390 in Part B.
The recommended reference ratio is:
Part A : Part B : Thinner = 100 : 25.2 : 80–100
The documented curing options include:
- 65°C × 60 minutes
- Air drying
After baking, the test procedure requires a 24-hour holding period before resistance testing.
Reference Coating Performance
Under the documented test conditions, the reference coating achieved:
- Surface dry: 15 minutes
- Hard dry: 24 hours
- Final pencil hardness: H
- 60° gloss: 100
- Cross-cut adhesion: 100%
- Impact resistance: 50 cm at 30 μm
- Flexibility: 1 mm
- Smooth leveling without cratering
- Acid resistance: Passed
- Alkali resistance: Passed
- QUV aging: 1200 hours, with no color change or delamination and gloss loss ≤1%
These values are based on the reference formulation and test conditions. Therefore, customers should confirm final performance in their own formulation, substrate, film thickness, and curing process.
Why Choose KN3366F?
KN3366F offers a practical combination of:
- High gloss
- Excellent leveling
- Strong ABS+PC adhesion
- Boiling-water resistance
- Broad formulation compatibility
- High solid content
- Good reference aging performance
For manufacturers looking for a hydroxyl acrylic resin for automotive coatings, KN3366F provides a strong starting point for automotive interior and high-gloss PU coating development.
Contact the Kenxon technical team with your substrate, curing conditions, target gloss, and resistance requirements to evaluate KN3366F for your formulation.