Classification of film-forming additives

2021-09-25   Pageview:516

Commonly used film-forming additives include Texanol, Lusolvan FBH, Coasol, DBE-IB, DPnB, DOWANOL PPh, Alcohol Ester 12, etc., and Texanol is often used as a comparative benchmark.














Thickening and rheology modifier for non-aqueous systems
In traditional oil paints, thickeners or gelling agents are mainly used to prevent wax with ptfe sedimentation. For the structure where the solvent is a continuous phase, liquid additives based on soaps or surfactant solutions can be added after the preparation of the oil-based paint, in order to achieve a pseudoplastic flow effect, which can prevent the wetting of the pigment, which can form a good Balanced pigment flocculation, pigment flocculation and thickening effects perform best in high-pigment coatings, and vulcanized or sulfonated natural oils have similar effects.

Another type of post-added additives is based on modified urethane functional groups, which form microcrystalline and rheological network structures through optimally controlled incompatibility. Another option is polysulfonates, which are calcium sulfonates based on calcium dodecylbenzene sulfonate or other surfactants containing organic solvents. Calcium sulfonate is used as a buffer. When these substances are mixed together, calcium sulfonate forms a microcrystalline network structure with adsorbable surface-active sulfonate molecules. In thermosetting organic resin systems, such as unsaturated polyester, alkali metal oxides, such as magnesium oxide or magnesium hydroxide, react with the carboxyl group contained in the polyester to act as a thickener. A small amount of water can help improve the increase. Thick effect, Metal soap

Zinc and aluminum soaps, especially aluminum stearate, are used as thickeners and gelling agents in solvent-based coatings. They are dissolved into micelles by the solvent and form a gel structure. The thickening effect depends to a large extent on the ratio of aluminum and stearic acid. In the case of excessive acid, the gelation effect is weak, and its main function is to improve the anti-settling property of the pigment when the leveling effect decreases. In order to obtain a strong thickening effect, the proportion of aluminum contained in aluminum stearate must be increased. In air-drying alkyd paint, the drier will have a strong interaction with aluminum stearate, so that the effect of the thickener disappears.


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