JPS59149969A - Primer for fluororesin - Google Patents

Abstract

PURPOSE:To provide a primer for white fluororesin, which has a high hiding powder and a clear bright color, by mixing aluminum flake and carbon black with a primer for heat-resistant, org. high-molecular fluororesin. CONSTITUTION:5-30wt% aluminum flake and 1-3wt% carbon black in a weight ratio of aluminum flake to carbon black of 25:1-25:1 are added to a primer for heat-resistant, org. high-molecular fluororesin wherein the weigh ratio of the fluororesin to the heat-resistant, org. high-molecular mateiral is 10:1-1:10, each quantity of aluminum flake and carbon black being based on the combined quantity of the fluororesin and the heat-resistant, org. high-molecular material. The term ''primer for heat-resistant, org. high-molecular fluororesin'' used herein refers to a dispersion or a soln. of water or an org. liquid contg. colloidal fluororesin particle (having a particle size of 0.05-0.5mu) and a prepolymer of heat-resistant, org. high- molecular material or fine particle (having a particle size of 0.5-50mu) of said material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light-colored glaze or immer for thermofluid fluororesin paints that has a large ability to hide the color of the base material.

Fluororesin, which has unique properties such as high heat and cold resistance and non-stick properties, is attracting attention as a material for kitchen and food industry equipment, where adhesive substances are often handled and heating and cooling processes are frequently performed. The scope of application is also increasing. For example, fluororesin-coated frying pans, rice cookers, and freezing dishes are typical applications for household kitchen appliances, while kneading rollers and mold release plates are used for food industry equipment. This is an application example of

Most of the fluororesin paints currently in use are primers that use dark-colored pigments, such as black or brown.
Since fluororesin paint is baked at a high temperature of 350 to 400C, uneven color tone and stains are likely to occur on the base material or the treated surface of the primer. Since it is transparent, the above-mentioned color tone unevenness and bleeding can be seen through, so dark pigments with hiding power are used to prevent this from being detected. On the other hand, from the viewpoint of the composition of the primer, the chromium-based or 6-r IJ acid-chromium based glitters that have been used in the past have great adhesion, but are environmentally friendly.
Due to hygiene issues, heat-resistant organic-molecular primers such as polyimide or polyphenylene sulfide are now becoming mainstream. 1. This is encouraging the tendency for it to be used again.

However, in recent years, as importance has been placed on the design and color coordination of kitchen utensils, etc., dark-colored primers such as black or brown are increasingly being avoided.

Therefore, home appliance manufacturers, kitchen equipment manufacturers, and painting companies wish to obtain white or gray light-colored primers that give a clean impression, but white or gray pigments generally have low hiding power and do not have the heat resistance mentioned above. The use of organic polymers makes it more difficult to produce light colored primers.

The addition of titanium white, which is best known as a white pigment, to the heat-resistant organic sieve molecular thread primer does not have sufficient hiding power even if the addition value is increased to about 15% K, which is the additive limit. , and the color tone is, for example, a dull yellow, which cannot be said to be a pure color tone. In addition, titanium white has poor dispersion stability in the primer and separates and settles as the pattern is left to stand day and night, so it is necessary to carry out a dispersion treatment before using the primer. If titanium white is used in excess of the additive limit, the adhesion force will be reduced, resulting in a fatal defect as a primer. Further, the addition of aluminum powder yields similar results to titanium white. Historically, even when flaky powder such as aluminum flake powder or mica flake powder is used, the hiding power is low, and the colored part is strongly influenced by the base color of the heat-resistant organic polymer, making the flaky powder difficult to use. The color becomes far different from the color of -C, and as a result, the desired light white or gray 1 limer cannot be obtained.

The inventor is I! '54. If the primer for fluororesin is bright white and has a strong and clean appearance, the sub-ratio between the fluororesin and the heat-resistant cylinder molecules is lo:lt:io. In the primer for heat-resistant organic polymer yarn fluororesin, which is in the yoke of
5 to 30% aluminum flakes and 1 to 3%, 7% carbon black to 2.5:1 to 25:1 to 81-0: It was discovered that a primer for fluororesin, which is further mixed with aluminum flakes and Karzan black at a heavy-magnetic ratio of 1, has excellent hiding power and exhibits a bright sill-gray color with a clean appearance. Created an invention.

In the present invention, the heat-resistant Ariso Nao molecular thread glimer for fluororesin refers to fluororesin colloidal particles (particle size approximately 0.05 to 0.
．． 5μ) and heat-resistant organic polymer brepolymer or particle size 0
．． A dispersion or solution of water or an organic liquid containing fine particles of 5 to 50μ, in which the weight ratio of fluorine resin/heat-resistant organic polymer is in the range of approximately 1/10 to 10/1. It is. Fluororesins include homopolymers of tetrafluoroethylene, fluoroolefins such as tetrafluoroethylene and hexafluoro of propylene, chlorotrifluoroethylene, perfluoro(ethyl vinyl ether), perfluoro(globin vinyl ether),
Refers to binary and multicomponent copolymers with fluoroalkyl vinyl ethers such as perfluorobutyl vinyl ether.

Specifically, 6 Teflon”TFE, “Teflon”F
EP, “Teflon 'PFA and 0 Teflon'#P1!;
(Itsukamo [■Product name) can be used as a suitable example.

In addition, it has heat resistance (Rokuhata Molecule uses breakers such as polyimide, polyamideimide, and polyethersulfone).
Examples include fine particles such as -4 and polyphenylene sulfide.

The heat-resistant glimer for molecular fluororesin is
For example, JP-A-50-77429, JP-A-50-83453,
50-142629, 51-/103144, 52-14630, 52-4217
4, No. 53-74532 and many other patents, documents, catalogs, etc.

The purpose of the present invention is to improve the color tone and hiding power of such a primer without impairing its adhesive strength and stability. The aluminum flake powder is in the range of 5 to 30% by weight, the carbon black powder is in the range of 1 to 3% by weight, and the weight ratio of the aluminum flakes and carbon black is 25 = 1 to 25 :1.

The above-mentioned aluminum flakes are of commercial grade having a diameter of 100 μ or less, and the carbon black may be of a type generally used for pigments, and its particle size is about 10 to ioom μ.

The primer composition of the present invention is a primer composition containing a white pigment such as titanium white, and a primer composition containing a white pigment such as titanium white, and a primer composition containing a flaky pigment such as aluminum flake powder or mica flake powder. It has double the hiding power, and its color tone is bright gray,
It has a clean feel. Furthermore, its adhesion and pigment stability are excellent, and are comparable to primers without pigments.

If the meat powder is lower than the lower limit of the specified range, the trap will not have sufficient hiding power, and if it exceeds the upper limit, the adhesion of the primer will be reduced. Historically, if the ratio of aluminum flake powder in the mixing ratio of meat powder is larger than the above range, the dark color of heat-resistant organic polymers can be suppressed, and the hiding power also decreases. On the other hand, if the ratio of aluminum flake powder is smaller than the above range, the color tone becomes too dark and the uneven coating of the primer becomes noticeable as uneven hue, making it impossible to put it to practical use. becomes.

Hereinafter, the present invention will be specifically explained using '5Ab=example.

Example 1 Primer for fluororesin paint (manufactured by Mitsui Fluorochemical,
Product name MP902, main ingredient: Teflon PF'A15
Aluminum foil (manufactured by Toyo Aluminum Co., Ltd., trade name 7'0-100) 15
parts by weight and an aqueous dispersion of carbon black powder (manufactured by Dainichiseika Chemical Co., Ltd., trade name: EP-51O, Car-C no black content: 37
Add 2 parts of violet (%) and mix gently with stirring.
A primer for fluororesin paint was manufactured.

Next, the above primer was spray-painted onto a blasted aluminum plate, air-dried, and then baked at a temperature of 37°C for 30 minutes to form a single layer of primer. Hiding power of primer, hue, brightness and release of primer layer 9Jii
etc. are shown in the table below.

Examples 2 to 3 and Comparative Examples 1 to 2 A single layer of brimer was formed in the same manner as in Example 1 except that the amounts of aluminum foil and carbon black powder were changed. The results are shown in the table below.

Comparative Examples 3 to 5 A single layer of brimer was formed in the same manner as in Example 1 except that aluminum foil, titanium white, or mica powder was added as a pigment. The results are shown in the table below.

Claims (1)

[Claims] The weight ratio of fluororesin and heat-resistant organic polymer is 10:1-
In a glimer for heat-resistant organic cylinder molecular thread fluorocarbon resin having a ratio of 1:10, 5 to 30* violet% of aluminum flakes and 1 to 3% of aluminum flakes and 1 to 3 Weight% of carbon black is ZS:X~
A primer for fluororesin, characterized in that it is further mixed with an aluminum flake to carbon black weight ratio of 25:l.