Aqueous dispersion composition for primer
A water-based dispersion and primer technology, applied in the direction of polyether coatings, coatings, primers, etc., can solve the problem that the primer and the surface coating are difficult to obtain sufficient interlayer adhesion, low melt creep viscosity, and poor peel strength. sufficiency
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[0061] (A) Binder polymer:
[0062] Polyamide-imide with an acid value of 40-90 mgKOH / g. It is used in the form of an aqueous dispersion.
[0063] (B) Ceramic spherical particles:
[0064] Aluminum oxide spherical particles, composite oxide spherical particles, aluminum borate spherical particles, etc. with a Mohs hardness of 6 or more. The average particle size is 0.4~2.5μm
[0065] (C) Modified PTFE particles:
[0066] The melt creep viscosity is 2×10 9 ~1×10 11 Modified PTFE particles with Pa·s and a standard specific gravity of 2.170 or less. It is used in the form of an aqueous dispersion.
[0067] (D) Aqueous medium:
[0068] water
[0069] (E) Nonionic surfactants:
[0070] Nonionic surfactant without phenolic structure
[0071] (F) Other fluororesin particles:
[0072] FEP particles
[0073] (mixing ratio) (“parts by mass”, the same below)
[0074] With respect to 100 parts of component (A), 170 to 352 parts of (B), 198 to 299 parts of (C), 7 to 11 parts ...
Embodiment 1~6
[0119] Using the ingredients and amounts shown in Table 1, an aqueous dispersion composition for a primer was prepared as follows.
[0120] First, the ceramic spherical particles (B) are added to the aqueous polyamide-imide dispersion (A), and dispersed by a sand mill to prepare a filler dispersion.
[0121] In addition, an aqueous dispersion of modified PTFE particles (C) and an aqueous dispersion of FEP particles (F) were added to carbon slurry (Carbon Millbes, an aqueous dispersion obtained by dispersing carbon black with a surfactant). After mixing with the nonionic surfactant (E), the above-mentioned filler dispersion liquid was added little by little while stirring. In addition, pure water (D) was additionally added as necessary to adjust the viscosity.
[0122] Spray-coat the water-based dispersion compositions of the primers prepared in Examples 1 to 6 onto a pure aluminum plate (A1050 material recorded in JIS H4000) with a sandblasting surface, so that the dry film t...
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