Aqueous dispersion composition for primer

A water-based dispersion and primer technology, applied in polyether paints, coatings, primers, etc., can solve the problem of insufficient interlayer adhesion between the primer and the surface coating, low melt creep viscosity, and poor peel strength. Sufficient and other issues

Active Publication Date: 2012-07-04
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the PTFE particles of the tetrafluoroethylene (TFE) homopolymer used, it has a melt creep viscosity of 3×10 8 ~3×10 9 Pa·s, standard specific gravity (a factor that becomes the basis of molecular weight, the larger the standard specific gravity, the smaller the molecular weight) of PTFE particles is 2.250 or more, the molecular weight of PTFE particles with this level of standard specific gravity (molecular weight) is still insufficient, the primer and the surface It is difficult to obtain sufficient interlayer adhesion between coats
In addition, as modified PTFE (PTFE with a small amount of monomer for modification copolymerized) particles, if the standard specific gravity is 2.165 or more, it is biased toward the high molecular weight side, but the melt creep viscosity is low, 1×10 7 ~1×10 9 Pa·s is insufficient in terms of peel strength in a high temperature environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[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 the aqueous dispersion composition of the primer prepared in Examples 1 to 6 onto a pure aluminum plate (A1050 material recorded in JIS H4000) with a sandblasting surface to make a dry film thickness of 10...

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Abstract

Disclosed is an aqueous dispersion composition which enables to form a primer layer that is excellent in interlayer adhesion with a top coat layer containing a fluororesin and capable of improving hardness and wear resistance of a coating film as a whole. Also disclosed is a coating film structure using such an aqueous dispersion composition. Specifically disclosed is an aqueous dispersion composition for primers for fluororesin coating film layers, which contains (A) a water-soluble, curable polyamideimide and / or polyimide binder polymer, (B) ceramic spherical particles, (C) modified PTFE particles and (D) an aqueous medium. This aqueous dispersion composition for primers is characterized in that the modified PTFE particles (C) have a melt creep viscosity at 380 DEG C within the range from 2*10<9> to 1*10<11> Pas, and a standard relative density of not more than 2.170. A primer layer is formed by using such an aqueous dispersion composition for primers, and a top coat layer containing a fluororesin is formed thereon.

Description

technical field [0001] The present invention relates to an aqueous dispersion composition for a primer, in particular to an aqueous dispersion composition for a primer whose surface coating is a fluorine-containing resin layer, and to an aqueous dispersion composition capable of forming the following primer, which is compatible with the surface The coating layer has excellent interlayer adhesion, and can improve the hardness and abrasion resistance of the coating film as a whole. Background technique [0002] Taking advantage of the excellent non-stick properties, antifouling properties, and heat resistance of fluororesins, fluororesins are widely used as coating materials for metal substrates of cooking utensils and home appliances. [0003] However, fluororesins are poor in adhesion to metals, so in many cases, an undercoat layer excellent in adhesion to metal substrates is provided on the surface of the metal substrate as a base layer of the fluororesin surface coating. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D179/08B32B27/28C09D5/00C09D7/12C09D127/12C09D127/18C09D171/02B05D7/24
CPCC08L79/08C09D179/08C08L27/18C09D5/002
Inventor 左右田义浩鸟居宽
Owner DAIKIN IND LTD
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