Intumescent powder compositions and coatings made therefrom
A composition, intumescent technology, applied in powder coatings, coatings, applications, etc., can solve the problems of unstable foam, easy rupture, unpredictable cell size, etc.
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Examples
Embodiment 1A and 1B
[0082] The formulations used in Examples 1A and 1B are listed in Table 1 below. In Example 1A, a 2.5 mm thick coating was applied to a steel I-beam 0.8 m long, Hp / A = 180, and weighing 40 kg using the formulations in Table 1. In Example 1B, the formulations in Table 1 were applied to a steel I-beam 0.8 m long, Hp / A = 300, and weighing 40 kg, to a thickness of 3.1 mm. In Examples 1A and 1B, the resulting coatings were smooth, semi-gloss films.
[0083] Two coated steel I-beams were placed in a full scale furnace and each sample of Examples 1A and 1B was tested for ignition point and film thickness. The results are listed in Table 3 below. After the fire point test, the surface of the coatings in Examples 1A and 1B became uneven and charred and blackened. Cutting along the cross-section of the expanded film revealed foam cells of various sizes, most of which were 5-20 mm in size, giving a spongy appearance.
[0084] components
Embodiment 3a and comparative example 3b
[0093] Example 3A and Comparative Example 3B examined the difference in performance using 5-phenyltetrazole. The formulations used in these examples are listed in Table 4.
[0094] The powders listed in Table 4 were coated on a steel I-beam with a length of 0.3 m, a weight of 20 kg, and Hp / A=300 to prepare a coated substrate to be tested. In Example 3A and Comparative Example 3B, the resulting coating was a smooth semi-gloss film with a film thickness of 1.7 mm.
[0095] In Example 3A and Comparative Example 3B, four coated I-beam substrates were subjected to fire point testing in a single lab size furnace. After the fire point test, the surface of the coatings of Examples 3A and 3B became uneven and charred and blackened. Cutting along the cross-section of the expanded membrane revealed foam cells of various sizes, most of which were 5-20 mm in size. The cross-sectional height was measured with a ruler, and the expansion coefficient (expanded fired film thickness / initial c...
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