JPS6166635A - Manufacture of vibration-damping resin panel - Google Patents

Abstract

PURPOSE:To obtain the captioned panel, in which the particles of mica are distributed continuously and uniformly and which is prominent in vibration- damping effect, by a method wherein the particles of mica, applied with magnetized metallic plating, and the powder of strong magnetic body are mized with the resin and the resin is cured after magnetizing it. CONSTITUTION:Parting agent 2 is coated on the upper surface of a mold 1 at first in accordance with a normal method and a mat-type glass cloth 3 is provided thereon. Next, the mica particles 5, applied with the metallic plating such as Ni or the like, which is provided with magnetic property, and strong magnetic powder body 6 such as iron powder or thelike are poured into the resin solution such as unsaturated polyester or the like and are mixed, thereafter, said resin solution is coated on said mat-type glass cloth 3. Subsequently, the uncured panel 7, obtained by above-described method, is carried into a strong magnetic filed impressing device 8 or the like, for example, to apply magentic force and magnetize the groups of mica particles 5 and strong magnetic powder 6. finally, said uncured panel 7 is cured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a splittable resin panel.

(Prior art) In the past, we focused on the fact that inorganic mica has a vibration damping function.
For example, in order to improve the soundproofing effect of an enameled steel plate, there is a method in which a layer of thermoplastic resin such as polyvinyl acetate mixed with mica powder is laminated on the surface of the enameled steel plate (Japanese Patent Laid-Open No. 56 −8 = 1951!; Publication).

In the case of this prior art, although it is possible to maintain the damping effect caused by the characteristics of mica, it is not enough to simply mix mica powder into the resin layer. Each of the mica particles is scattered in a completely independent state.

Therefore, non-uniformity 6 tends to occur in the distribution state of each mica particle, making it impossible to obtain a sufficient distribution effect, and each mica particle individually shares the external vibration stress, resulting in the external vibration of each mica particle. The stress sharing ratio (hereinafter simply referred to as stress sharing ratio) was low (and the vibration damping effect due to the synergistic effect of the entire mica particle group could not be sufficiently brought out -4).

(Objective of the Invention) The present invention has been made to eliminate the above-mentioned drawbacks.
By bonding them together and dividing them continuously and uniformly, the force sharing ratio of each mica particle is synergistically improved.
- The object of the present invention is to provide a method for manufacturing a vibration-damping resin panel that achieves a sufficient vibration-damping effect.

(Structure of the Invention) In order to achieve the above object, the present invention uses mica particles plated with a magnetic metal and ferromagnetic powder in a method for manufacturing a damping resin panel containing mica. The resin solution is characterized in that it is injected into a resin solution, mixed and stirred, and then placed in a magnetic field to apply magnetic force, and then hardened.

(Function) That is, according to the above configuration, each mica particle in the cured resin layer is bound to each other in fixed units by magnetic force to form a continuous and uniformly distributed mica group.

Therefore, the stress sharing ratio of each mica particle is improved by the synergistic effect due to mutual bonding compared to the stress sharing ratio of each mica particle as an independent single substance, and it is possible to obtain a sufficiently high vibration damping effect.

(Example) FIGS. 1(a) to 1(e) are process diagrams of a method for manufacturing a damping resin panel according to an example of the present invention.

In the figure, reference numeral I indicates a molded material made of, for example, synthetic resin, and damping panel layers are formed on this molded material in the following order.

That is, first, in the first step (a), a release agent 2 such as wax is applied to the upper surface of the first mold.

Next, in the second step (b), a matte glass cloth 3 is provided on the mold release agent 2 in order to obtain an FRP (fiber reinforced plastic deck) +1η composition.

Then, in a third step, a thermoplastic resin solution 4 such as unsaturated polyester is prepared, and the resin solution 4 is coated with particles having magnetizable metal plating such as nickel (N1) on the surface. Mica particles 5 and ferromagnetic powder 6 such as iron powder are added from the upper surface and mixed and stirred. In this case, the mixing ratio of mica to the resin m is preferably at least 20% (weight ratio). Furthermore, for metal plating of the mica particles 5, a method is adopted in which, for example, a surface treatment such as oxidation treatment is first performed, and then a magnetic metal such as nickel (Ni) is plated on the surface by, for example, a dip method. .

Furthermore, in the fourth step, the resin solution 4 containing the mica particles 5 and the ferromagnetic powder 6 formed in the third step,
The matte glass cloth 3 provided in the second step is coated to a predetermined thickness, and a matte glass cloth 3 is further provided on top of the resin layer, so that at least two sheets of glass cloth 3°3 are coated. An uncured panel 7 with the resin layer interposed therebetween is formed (if necessary, this is further laminated in multiple stages).

Next, in a fifth step, the uncured panel 7 is carried into a strong magnetic field applying device 8 with the resin layer not being cured, and a strong magnetic force is applied to the 5 groups of mica particles in the resin solution 4 and Magnetize six groups of ferromagnetic powders. In @field impression JIG in this case, preferably not only a fixed polarity but also a magnetic field of opposite polarity is applied at a fixed period by changing the direction of the current supplied to the coil 9. As a result, as will be described later, the IL valve-shaped magica r 51 is connected at a constant m position by 4 degrees.
! 7 fl11! It is possible to uniformly distribute the particles without any presence of particles. As a result, the ferromagnetic powder 6 is completely magnetized, and the mica particles 5 are bonded to each other in, for example, a petal shape using the ferromagnetic powder 6 as a binding medium (see Figure 2 (10).
), forming a network-like mica particle group that is continuous with each other in a fixed unit.

Finally, the powdered panel 7 after applying the magnetic field is cooled and hardened as it is, thereby obtaining a completed hardened panel with vibration damping properties.

FIG. 2 shows an enlarged cross-sectional structure of the panel manufactured as described above. That is, as is clear from the figure, a plurality of microscopic mica particles 5 are bonded together in a petal-like manner by ferromagnetic powder 6 such as iron powder, and are continuously and uniformly distributed in the resin layer. 4゛ru second ni r,! Otsu.

Therefore, due to mutual coupling, the stress sharing ratio for external vibration stress is significantly higher than when each mica piece is scattered in completely independent circulation, and the damping rate (vibration damping property) for external IIU vibration is significantly higher. Becomes Kiirano.

In other words, for example, the vibration damping panel is shown in Figure 3.
Let us consider the case where mechanical vibration (acupuncture free vibration fil) is applied. This vibration waveform expresses the change in the amount of vibration of the mechanical vibration as a sine function with respect to time, so it indicates either the amplitude or the amount of vibration. In FIG. 3, if the maximum amplitude of the added vibration waveform AO1 is the amplitude of the vibration waveform after a certain period of time (T,) has elapsed, then the logarithmic damping rate δ in this case is expressed by the following equation.

Based on this formula, δ is calculated and shown in relation to the mica mixing rate, as shown in Figure 4. The characteristics of , and (mouth) respectively indicate the damping effect of the damping panel using the conventional technology (simple addition of mica) described above.

According to FIG. 4, when the mixing ratio of mica pieces to a constant amount of resin is about 20%, the damping effect of both the conventional method and the method of the present invention:
Heika, -1 note mix, 9″jr・20′;, V) On top (conventionally, this is usually the actual rotation), rj rotary and 1. It can be seen that the damping effect becomes dramatically higher.This is because the mica contamination rate is determined by the degree to which mica is continuous in the same field of view when looking at the mica contamination rate in a microscopic photograph, that is, the mica continuity rate (continuous mica WI/total number of mica) is shown instead, resulting in a graph similar to B.

(Effects of the Invention) As explained above, the present invention relates to a method for manufacturing a vibration-damping resin panel containing mica, in which mica particles plated with a magnetic metal and ferromagnetic powder are placed in a resin solution. The lattice solution is injected into the liquid, mixed and stirred, and after f2, the lat fat solution is placed in a magnetic field to apply magnetic force, and then hardened.

Therefore, according to the present invention, each mica particle in the cured resin layer is bonded to each other in fixed units by magnetic force to form a continuous and uniformly distributed mica grain. Therefore, the stress sharing ratio of each mica particle is gracefully improved by the synergistic effect of the Alhl bond compared to the stress sharing ratio of an individual mica particle, and a sufficiently high vibration damping effect can be achieved.

[Brief explanation of drawings]

FIGS. 1(a) to 1(e) are manufacturing process diagrams showing a method for manufacturing a damping resin panel according to an embodiment of the present invention in chronological order;
Fig. 2 is an enlarged cross-sectional view showing the tissue structure on the tomographic plane of the damping resin panel manufactured by the manufacturing method according to the above example, Fig. 3 is a waveform diagram of damped vibration, and Fig. 4 is a diagram showing the structure of the damping resin panel manufactured according to the above example. It is a graph showing the vibration damping effect of the vibration damping resin panel in comparison with a conventional example. 4... Resin solution 5... Mica particles 6... Ferromagnetic powder 8... Strong magnetic field application device

Claims (1)

[Claims] 1. A method for producing a damping resin panel containing mica, in which mica particles plated with magnetic metal and ferromagnetic powder are injected into a resin solution, mixed and stirred, and then the resin solution is mixed and stirred. A method for producing a vibration-damping resin panel, characterized in that the panel is placed in a magnetic field, applied with magnetic force, and then cured.