How to choose anti-scratch additives?

2022-06-12   Pageview:209

Anti-scratch additives

In powder coating formulations, the role of lubricating (slip) and anti-scratch agents is to migrate to the surface of the coating to form a monomolecular layer, or float to the surface of the coating to form a protective layer during the film-forming process of the powder coating. Surface tension and surface friction coefficient, play a lubricating (slip) effect, and improve its scratch resistance.

Types of anti-scratch additives

1 Silicone products

1) Including:
① Silicone polymers
② Phenyl and alkyl modified silicones
② Polyether modified silicones
④ Polyester modified silicones
⑤ Reactive group modified silicones, etc.

Micronized PTFE Wax PTFE-0107 Name: Micronized PTFE Wax Model Number: PTFE-0107 Chemical Composition: PTFE

2) Function: After adding, it can reduce the surface tension and migrate to the surface of the coating film to form a monomolecular layer, so that the coating film has good smoothness, lubrication (slip) and scratch resistance.

3) Requirements:
① It is required to have a certain compatibility with the coating system, so that separation will not occur.
② A certain degree of incompatibility is also required, which is conducive to the formation of a monomolecular layer on the surface of a small amount of exuded coating film, which plays the role of leveling, lubrication (slip) and scratch resistance.

2 Waxes

1) includes:

①Polyethylene wax: It has a wide range of applications and can meet general requirements.
② Polypropylene wax
Micopowder PTFE wax: the best effect and the highest price.
④ Polyamide wax
⑤ Polytetrafluoroethylene modified polyethylene wax
⑥ Polyethylene modified polyamide wax, etc.

2) Function and features:

① The relative density is about 1.0, and the compatibility with resin is poor. It has high hardness, high toughness and easy dispersibility.

② The relative molecular mass is between 1500 and 6000. Except for the relative density of polytetrachloroethylene wax, which is 2.2, the other relative densities are between 0.8 and 1.0, which is beneficial to float to the surface of the coating film during film formation.

③ During the film forming process, it floats to the surface of the coating film to form a uniformly distributed protective layer, which reduces the friction coefficient and improves the anti-scratch performance.

④ Micronized wax has different specifications and particle sizes, and its particle size ranges from several microns to tens of microns, and can obtain coatings with different appearances.

Precautions

1 There are two ways to add lubricating (slip) and anti-scratch agents:

①Internal addition (melt extrusion mixing method)

②Add (dry mixing method) micropowder with very small particle size.

The added anti-scratch adjuvant can also be added inside.

2 According to customer requirements and production costs, select suitable lubricants (slippery) and anti-scratch agents for experiments, and the amount added is based on the experimental results.

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