JP2012057188A - Member for heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member for a heating cooker having uniform black color over a long term and capable of maintaining excellent initial characteristics such as water repellency, non-adhesiveness, wear resistance, scorching resistance and the like.SOLUTION: PTFE fine particles are dispersed and co-precipitated in a plated coating 10 (including a blackening treatment layer 10A) to improve water repellency, non-adhesiveness, scorching resistance and the like of a gridiron 2, and contamination can be reduced or the removal of the contamination can be facilitated. By performing a blackening treatment to a surface layer part of the composite plated coating 10, a blackening treatment layer 10A thinner than the composite plated coating 10 is formed.

Description

  The present invention relates to a cooking utensil member such as a grill net having a black composite plating film in which fluorine material-based fine particles are co-deposited.

  In a cooking device such as a gas stove, a gas table, and an electromagnetic induction heater, fish is cooked using a grill (see, for example, Patent Document 1). During cooking, dirt such as fish fats and meat pieces adhere to the grill and become contaminated. Therefore, it has been proposed to increase the water repellency, non-adhesiveness, and scorch resistance of the grill by applying a heat-resistant fluororesin to the surface of the grill, thereby reducing contamination or facilitating removal of contamination. ing. In addition, for the purpose of making the surface contamination of the grill net inconspicuous and enhancing the high-class feeling of the grill net, proposals have been made to blacken the entire grill net by mixing black particles in a heat-resistant fluororesin.

JP 2010-219 A (for example, FIG. 1)

  However, simply applying a heat-resistant fluororesin will cause the coating layer to peel off while repeatedly cleaning the grill, and the water repellency, non-adhesiveness, and scorch resistance of the grill will be partially degraded. was there. In addition, the partial peeling of the coating layer partially exposes the main body and the net material of the grill net, detracting from the beauty of the grill net and reducing the product value.

  The present invention has been made in view of the above problems, and has a uniform black color over a long period of time and can maintain initial excellent characteristics such as water repellency, non-adhesiveness, abrasion resistance, and charring resistance. It aims at providing the member for heating cookers.

  In order to achieve the above object, a member for a heating cooker according to the present invention includes a main body part and a composite plating film containing dispersed fluorine compound fine particles formed on the surface of the main body part, and a composite plating film by blackening treatment. A blackening treatment layer thinner than the composite plating film is formed on the surface layer portion.

  In the present invention configured as described above, the fine particles of the fluorine compound are dispersed and co-deposited on the surface of the main body of the cooker member together with the metal to reduce the stain on the cookware member, and when the stain occurs. Moreover, the removal can be easily performed. In addition, since the composite plating film is formed on the surface of the main body as described above, it is possible to maintain the peel resistance for a longer period than the conventional product coated with a heat-resistant fluorine resin (hereinafter referred to as “heat-resistant fluorine-coated product”). In other words, excellent initial characteristics such as water repellency, non-adhesiveness, abrasion resistance and scoring resistance can be maintained over a long period of time.

  Moreover, in order to make the surface of the member for cookware black, in this invention, since the blackening process is performed with respect to the composite plating film, the surface of the member for cookware can be uniformly blackened. However, as will be described in detail later, the peel resistance of the composite plating film varies depending on the ratio of the blackening treatment layer to the composite plating film. This is a knowledge obtained by the inventors of the present invention from various experiments and the like, and in order to obtain a uniform black surface over a long period of time, it is very important to control the above ratio. Therefore, in the present invention, the blackening treatment is not performed on the entire composite plating film in the thickness direction, but only the surface layer portion is blackened to form a blackening treatment layer thinner than the composite plating film. Thus, the peeling resistance of the composite plating film is secured by satisfying (thickness Ta of the blackening treatment layer) <(thickness T0 of the composite plating film after blackening treatment). For example, a member for a heating cooker such as a grill is preferably configured so that Ta / T0 ≦ 0.5 is satisfied.

  In the present invention, the fluorine compound fine particles are dispersed in the composite plating film. For this reason, some of the fluorine compound fine particles are exposed on the surface of the composite plating film, and these fluorine compound fine particles may be peeled off from the blackening treatment layer when the heating cooker member is cleaned. Therefore, when the blackening treatment layer is thinner than the particle size of the fluorine compound fine particles, the composite plating film layer that is not blackened is exposed due to the peeling of the fluorine compound fine particles, which may cause color unevenness. . In consideration of this point, it is desirable that the blackening treatment layer has a thickness Ta that exceeds the average particle diameter of the fluorine compound fine particles.

  Here, for example, a composite plating film may be formed by an electroless nickel plating method that has been widely used in the past, and by applying a blackening treatment (chemical conversion treatment) to the composite plating film, a surface layer portion of the composite plating film A nickel sulfide layer may be formed on the heating cooker member to blacken it.

  In addition, a bright nickel layer may be formed on the uppermost layer of the main body, thereby further improving the adhesion of the composite plating film to the main body to improve the peeling resistance, and giving the cookware member gloss. Can enhance the quality of the product.

  As described above, in the present invention, a composite plating film containing dispersed fluorine compound fine particles is formed on the surface of the main body portion, and the surface layer portion of the composite plating film is blackened to make it darker than the composite plating film. A treatment layer is formed. Therefore, according to the cooker member according to the present invention, it has a uniform black color over a long period of time and can maintain initial excellent characteristics such as water repellency, non-adhesiveness, abrasion resistance, and scorch resistance. it can.

It is a perspective view which shows the whole structure of the grill net which is one Embodiment of the member for heating cookers concerning this invention. It is a fragmentary sectional view of the grill of FIG.

  FIG. 1 is a perspective view showing the entire structure of a grill net which is an embodiment of a member for a heating cooker according to the present invention. 2 is a partial cross-sectional view of the grill of FIG. 1. FIG. 2 (a) shows the state before the blackening process, while FIG. 2 (b) shows the state after the blackening process. The grill 2 is used, for example, when cooking fish or eggplant in an electromagnetic induction heating cooker described in Patent Document 1. In this heating cooker, the grill 2 is stored in the cooking chamber while being placed on a saucer, and can be slid out of the cooking chamber together with the saucer.

  In the grill 2, a main body 8 is configured by processing a plurality of metal wires such as stainless steel wires, and forming an electro nickel plating layer 6 on a mesh material 4 formed by welding to form a mesh. . In the present embodiment, in order to impart gloss to the grill net 2, the electro nickel plating layer 6 has a three-layer structure of semi-bright nickel plating, wood nickel plating, and bright nickel plating, and is 8 [μm. It is formed with the above thickness.

  A polytetrafluoroethylene (hereinafter referred to as “PTFE”) composite plating film 10 is formed on the electric nickel plating layer 6 thus configured by the following composite plating bath to cover the entire grill net 2.

In this embodiment, for deionized water or city water 1 [L],
-Electroless nickel plating solutions A and B (trade name "Black EN") manufactured by Atotech Japan are 60 [mL], 150 [mL],
PTFE fine particles of 1 [μm] or less (trade name “ECOLUTY Dispersion” manufactured by Ebara Eugene Corporation) 7 [g / L],
・ Surfactant (trade name “Ecoruty Tef SW” manufactured by Sugawara Eugene Corporation) 0.5 [mL / L],
The composite plating film 10 having a thickness of 3 [μm] or more is formed using the composite plating bath added at a ratio of

Further, the surface layer portion of the PTFE composite plating film 10 formed as described above is subjected to a blackening treatment (chemical conversion treatment) with the following blackening treatment agent, so that a black blackening treatment layer 10A having a thickness Ta is obtained. On the other hand, the remaining part is the non-processed layer 10B. Thus, in this embodiment,
(Thickness Ta of blackening treatment layer 10A) <(thickness T0 of composite plating film 10 after blackening treatment)
Is satisfied, the blackening treatment layer 10A is formed on the surface layer portion of the composite plating film 10 while leaving the non-treatment layer 10B.

  The blackening agent used in this embodiment is obtained by adding ferric chloride 200 [g / L] and hydrochloric acid 20 [mL / L] to deionized water or city water. Nickel contained in the surface layer portion of the PTFE composite plating film 10 was sulfided using an agent to form a black blackening treatment layer (nickel sulfide layer) 10A. Of course, the PTFE fine particles are dispersed as they are in the blackening treatment layer 10A, and characteristics such as water repellency are not lost and are maintained as they are.

  As described above, in this embodiment, PTFE fine particles are dispersed and co-deposited in the plating film 10 (including the blackening treatment layer 10A), and the water repellency, non-adhesiveness, scorch resistance, etc. of the grill net 2 are as follows. It is possible to reduce the contamination or to easily remove the contamination. Although the PTFE fine particles are dispersed on the surface of the grill net 2 in this way, it is the same as the heat-resistant fluorine-coated product. However, in this embodiment, the PTFE composite plating film 10 is formed on the surface of the main body 8. The peel resistance can be remarkably improved as compared with the coated product, and excellent initial characteristics such as water repellency, non-adhesiveness, abrasion resistance and scorch resistance can be maintained over a long period of time.

  Further, in this embodiment, since the bright nickel plating layer is formed on the base of the PTFE composite plating film 10 (including the blackening treatment layer 10A), the adhesion of the composite plating film 10 to the main body portion 8 is improved. Thus, the peel resistance can be improved, and the grill 2 can be further glossed to further enhance the aesthetics of the product.

  Further, in the present embodiment, the entire composite plating film 10 is not blackened, but only the surface layer portion of the composite plating film 10 is blackened. The reason will be described in detail below.

  In order to verify how the surface appearance of the composite plating film 10 and the peel resistance of the film change according to the ratio of the blackening treatment layer to the composite plating film 10 (= Ta / T0), The following experiment was conducted. In this experiment, an electronickel plating layer 6 having a thickness of about 25 [μm] and a composite plating bath having a thickness of about 3.3 [μm] are applied to the grill net 2 by electronickel plating. A plurality of grill nets 2 on which the film 10 was formed were prepared and dipped in the above blackening agent adjusted to a temperature of 35 ° C. for blackening treatment. Here, the thickness Ta of the blackening treatment layer 10A and the thickness Tb of the non-treatment layer 10B are adjusted by making the immersion times of the blackening treatment agents 2 different from each other.

Further, the blackened net 2 after the blackening treatment is subjected to a water washing treatment, a stabilization treatment with an alkali treatment liquid, a water washing treatment, and a heat treatment at 350 ° C. for 10 minutes in this order. Measurement of thickness Ta, thickness Tb of non-treatment layer 10B, and appearance evaluation were performed. The results are shown in Table 1.

The evaluation methods in the table are as follows.
<Mura>
◎: Uniform appearance with black ○: Uniform appearance with weak blackness △: Appearance with no blackness and whiteness ×: Appearance with unevenness and unblackened parts <Sooty peeling>
◎: Appearance with no soot-like peeling ○: Appearance with soot-like peeling of less than 2% Δ: Appearance with soot-like peeling of less than 2% to 10% ×: Appearance with soot-like peeling of 10% or more

  From the results shown in Table 1, by performing the blackening treatment so as to form a blackening treatment layer 10A thinner than the composite plating film 10, it is possible to obtain the grill net 2 having a uniform black color while preventing soot-like peeling. Was confirmed. Further, in order to further improve the rate of occurrence of soot-like peeling, blackening such as the blackening treatment time so that the ratio of the blackening treatment layer 10A to the composite plating film 10 after the blackening treatment is 0.5 or less. What is necessary is just to adjust process conditions. In addition, by adjusting the blackening treatment conditions so that the ratio is 0.42 or less, the uniform black can be obtained while further suppressing the occurrence of soot-like peeling. Further, by adjusting the blackening treatment conditions so that the ratio is 0.32 or less, the uniform black can be obtained while suppressing the occurrence of soot-like peeling almost completely. As is clear from the table, the film thickness (T0 = Ta + Tb) of the composite plating layer 10 is reduced by the blackening treatment. Therefore, in consideration of this point, a PTFE composite having a thickness of at least 1.5 [μm] or more is taken into consideration. It is desirable to set the blackening conditions so that the plating layer 10 remains.

  In addition, since the PTFE fine particles are dispersed and exist in the composite plating film 10, it is more desirable to set the thickness Ta of the blackening treatment layer in consideration of the following points. That is, a part of the PTFE fine particles are exposed on the blackened surface and may be peeled off when the grill net 2 is washed. Therefore, when the blackening treatment layer 10A is thinner than the particle size of the PTFE fine particles, the composite plating film layer that has not been blackened due to the removal of the PTFE fine particles, that is, the non-treatment layer 10B is exposed, causing color unevenness. It may become. In consideration of this point, it is more desirable to perform the blackening process so that the thickness Ta of the blackening process layer 10A exceeds at least the average particle diameter of the PTFE fine particles. Here, the “average particle diameter of PTFE fine particles” can be determined by using a measurement method suitable for measuring the particle diameter of the fine particles, for example, a light scattering method.

  The present invention is not limited to the above-described embodiment, and various modifications can be made to the above-described one without departing from the spirit of the present invention. For example, in the said embodiment, the grill net 2 is illustrated as a member for a heating cooker, and this invention is applied with respect to the grill net 2, However, The application object of this invention is not limited to the grill net 2. For example, the present invention can be applied to all members used in a cooking device such as a saucer, and the configuration, material, shape, etc. of the main body of the cooking device member are arbitrary.

  In the above embodiment, the PTFE fine particles are used as the “fluorine compound fine particles” of the present invention, but other fluorine compounds (for example, tetrafluoroethylene-perfluoroalkylbiphenyl ether copolymer, tetrafluoroethylene-hexafluoro, etc.). Fine particles of a propylene copolymer or the like may be used.

2 ... Grilled net (cooking utensils)
4 ... Net material 6 ... Electro nickel plating layer 8 ... Main body 10 ... Composite plating film 10A ... Blackening treatment layer 10B ... Non-treatment layer

Claims (5)

A main body portion, and a composite plating film containing dispersed fluorine compound fine particles formed on the surface of the main body portion;
A member for a heating cooker, wherein a blackening treatment layer thinner than the composite plating film is formed on a surface layer portion of the composite plating film by blackening treatment on the composite plating film. When the thickness of the blackening treatment layer is Ta and the thickness of the composite plating film after the blackening treatment is T0,
Ta / T0 ≦ 0.5
The member for a heating cooker according to claim 1, wherein   The member for a heating cooker according to claim 2, wherein a thickness Ta of the blackening treatment layer exceeds an average particle diameter of the fluorine compound fine particles. The composite plating film is a film formed by an electroless nickel plating method,
The member for a heating cooker according to any one of claims 1 to 3, wherein the blackening treatment layer is a nickel sulfide layer formed on a surface layer portion of the composite plating film by the blackening treatment.   The cooker member according to claim 4, wherein a bright nickel layer is formed on the uppermost layer of the main body.

Images