PA-8600 is a specially modified polyamide wax micro-powder, mainly used as a thixotropic additive for heavy-duty anti-corrosion coatings. It can fully disperse in coating systems, swell and form a strong network structure after appropriate heating, effectively establishing thixotropic viscosity. This excellent thixotropic property improves the anti-sag and anti-sedimentation performance of coatings. PA-8600 is an additive with good recoatability and minimal hazards.

Typical Physical Data

*The color of the powder may vary slightly from white to light yellow depending on raw material batches, which has no impact on product quality.

Performance Characteristics

1.100% active polyamide wax powder, offering high cost-effectiveness.

2.No pre-gel preparation required; can be directly added to coating systems.

3.Excellent thixotropy provides better anti-sedimentation and anti-sag effects.

4.Dispersibility is unaffected by temperature, performing well across a wide temperature range.

5.Compared with hydrogenated castor oil, the risk of film formation and interlayer peeling is extremely low.

Application Fields

PA-8600 is widely used in various synthetic resin coatings, especially epoxy coatings, chlorinated rubber coatings, and heavy-duty anti-corrosion coatings such as alkyd and polyurethane. It performs better when used with polar solvents.

Addition Rate

0.5-2.0% of the total system weight

Usage Method

PA-8600 can be added at any stage of production, preferably at the initial stage to ensure sufficient wetting and activation time. It is recommended to use processing equipment with strong shearing force such as sand mills, grinders, or high-speed dispersers. PA-8600 requires specific processing temperature and time to achieve optimal performance. During the pigment grinding stage, the system undergoes sufficient shearing force, and the temperature rise from processing helps disperse and activate PA-8600 for optimal performance. The recommended dispersion temperature is 40–70℃. In polar solvent systems, dispersion works well at low temperatures, while systems with fewer polar solvents may require higher temperatures. Additionally, adding 1-2% isopropyl alcohol can promote PA-8600 swelling when the dispersion temperature cannot be increased.

Packaging and Storage

15kg kraft paper bags.

Application of Polyamide Wax Powder PA-8600 in Anti-Corrosion Coatings

The core performance of polyamide wax, bentonite, and fumed silica lies in their ability to form a three-dimensional network structure after activation. For organic clays and fumed silica, this structure is formed by hydrogen bonding between individual platelets or particles, which is easily destroyed by protic solvents, especially the curing agent amine groups in epoxy primers. In contrast, the hydrogen bonds formed by amide wax rheology additives are highly ordered, and the three-dimensional network formed by the crystalline amide fibers through highly ordered interactions is not destroyed by the amine groups of curing agents. The structure of PA-8600 developed by our company is comparable to that of foreign competitors, as shown in the NMR spectra (Figure 1), where the carbon and hydrogen spectra correspond one-to-one.

Figure 1. NMR Spectra of PA-8600 and Competitor Products

Excellent Anti-Sedimentation Performance

In a gray primer, 0.8% PA-8600 and a competitor product were added respectively, and stored in a 50℃ oven for one month. It can be seen that the anti-sedimentation performance of the system with PA-8600 is significantly improved compared to the blank sample, comparable to that of the competitor product as shown in Figure 2.

Figure 2. Anti-Sedimentation Test at 50℃ for One Month

(Left: Blank; Middle: PA-8600; Right: Competitor)

Superior Anti-Sag Performance

From the hanging test in Figure 3, it can be seen that adding PA-8600 hanging film thickness of 450 microns, adding competitor wax powder hanging film thickness of 400 microns, PA-8600 hanging performance is slightly better, which is due to the special rheological properties of PA-8600 decision.

Figure 3. Hanging Test Chart

(Left: PA-8600, 450 microns; Right: Competitor, 400 microns)

Rapid Viscosity Recovery

PA-8600 has rapid viscosity recovery, as shown in the three-stage viscosity test (Figure 4). In the first stage (shear rate 0.1 1/s) and the second stage (shear rate 1000 1/s), PA-8600 and the competitor have similar viscosities. In the third stage, after the shear rate recovers to 0.1 1/s, the red line (PA-8600) recovers faster than the competitor, explaining its better anti-sag performance.

Figure 4. Viscosity Recovery Curves of Coatings

(Red: PA-8600; Black: Competitor)

Good Storage Stability

The decline in anti-sag performance of epoxy coatings after storage is an industry challenge, and even with polyamide wax, there is a downward trend, though still meeting usage requirements. The sag film thickness of PA-8600 decreased from 450 microns to 400 microns, while that of the competitor decreased from 400 microns to 350 microns.

Figure 5. Hanging Test Chart After Thermal Storage

(Left: PA-8600, 400 microns; Right: Competitor, 350 microns)