JPH01229133A - Damping sheet, manufacture thereof and compound type damping material - Google Patents

Abstract

PURPOSE:To manufacture a thin damping sheet easily and use it in an extensive temperature range by impregnating liquid silicon in a sheet material consisting of an inorganic filler and silicone rubber or a binding material, and hardening it. CONSTITUTION:A damping sheet 1 is made up of impregnating liquid silicon in a sheet consisting of an inorganic filler and silicone rubber or a binding material and then hardened. A projection and an interconnecting hole being embedded in the damping sheet 1 each are formed in a claw-up steel sheet 2a being laminated on the damping sheet 1. The claw-up steel sheet 2a installs extrusion projections 3a alternately at both sides and forms extruding holes 4a therein. And then the damping sheet 1 is stuck, under pressure, at both the sides respectively. Thus, the thin damping sheet is easily manufacturable, and it is usable in an extensive temperature range.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to L1 vehicles, ships, and other industrial fields.
Vibration, I by vibration! rr, squeal 1°? The present invention relates to composite vibration damping materials that are widely used to damp vibrations, vibration damping sheets that are laminated materials thereof, and methods of manufacturing the vibration damping sheets.

(Conventional technology) Conventional composite vibration damping materials include soundproofing paint made by mixing powders such as asbestos, pumice, and L1 cloud in tar, and rubber made by mixing filler Ne1 into synthetic rubber and forming it into a sheet. System material Ne'1, or thermoplastic W+1 resin with i'+f Qj material and filler book-1
A vibration damping material made of a resin-based material mixed with
(restricted type).

In this way, vibration-damping sheets made of viscoelastic materials such as tar, rubber, and synthetic resins and inorganic fillers in the form of fibrous materials such as rock wool, pumice, and sludge, as well as powdered materials have been shown to be excellent. It is well known that it exerts a vibration damping effect.

In addition, the steel plate used for composite vibration damping material is usually 0.1 m
The thickness of the vibration damping sheet laminated thereon is as thin as 0.1 mm to 2 mm.

However, since filling materials such as rock wool and pumice are bulky, and tar, rubber, and synthetic resins have viscoelasticity, it is necessary to mix them uniformly and to form thin sheets from such mixed materials. None of these methods are easy, and therefore, in order to obtain the desired thin damping sheet, it is necessary to separately roll press and roll the mixed material.

Furthermore, conventionally used damping sheets are classified into those for room temperature, medium temperature, and high temperature, and are suitable for specific narrow temperature conditions, but have the disadvantage that they cannot be used over a wide temperature range.

Therefore, when a conventional composite vibration damping material made of laminated damping sheets is used under wide temperature conditions, the viscoelastic material of the damping sheet fluidly deforms with changes in temperature and load.
There is a drawback that the damping sheet is easily peeled off from the steel plate.

In any case, conventional damping sheets and composite damping materials have one or more problems in manufacturing and use.

(Problems to be Solved by the Invention) Therefore, in the present invention, the drawbacks of conventional damping sheets and composite damping materials can be solved, and a homogeneous and desired thin damping sheet can be easily manufactured. , this damping sheet can be used over a wide temperature range and has extremely versatile physical properties, and when such damping sheets are laminated, the damping sheet can be easily peeled off over a wide temperature range and even with changes in load. The object of the present invention is to provide a composite type vibration damping material consisting of a claw steel plate that can improve vibration damping performance by itself.

(Diagram for solving the problems) Vibration damping sheet according to the present invention) 1 is a fibrous inorganic filling material such as rock wool, crow fiber, etc., talc, scaly fruit 1169, carbon black, viscosity 1: A 2 to 5% suspension of inorganic filler material and silicone rubber as a bonding material dispersed in water is made using a wire mesh to form a wet seal material. After this is dehydrated and dried, it is manufactured by impregnating it with liquid silicone and curing it.

The composition of the mixed material may be appropriately selected depending on the usage conditions of the vibration damping sheet, and it can correspond to a wide range of physical properties.

Here, the fibrous inorganic filler has the effect of maintaining the mechanical strength required during the fabrication and use of the vibration damping sheet without reducing the damping effect, and the scaly filler has the effect of maintaining the vibration damping performance at a low level. The powdered filling material can be used to capture the low mechanical strength caused by the hollow filling material and to adjust the playability, and the powdered filling material can be used to adjust the playability of the mixed material. Due to its viscosity of 914M, the silicone rubber used as the material has the effect of imparting vibration damping performance together with the impregnated silicone.

Further, in the composite vibration damping material according to the present invention, the vibration damping sheet 1 includes a fibrous inorganic filler such as rock wool or glass fiber, talc,
The damping material is made by impregnating liquid silicone into a sheet made of an inorganic filler material in the form of scales such as mica and/or powders such as carbon blank or clay, and silicone rubber as a bonding material and hardening it. The claw steel plates 2a and 2b stacked on the sheet 1 are each formed with a hole for communication with a protrusion buried in the damping sheet 1.

The nail stand steel plate 2a has a structure in which a large number of extruded protrusions 3a are arranged and protruded alternately on both sides to form extruded holes 4a, and the damping sheets 1 are crimped onto both sides of the extruded holes 4a.

The nail stand steel plate 2b has a plurality of notch protrusions 3b protruding from one side in an aligned manner to form a notch hole 4b, and the nail stand steel plate 2b has the notch protrusions 3b facing inward on both sides or one side of the vibration damping sheet 1.
The configuration is such that the two are crimped together.

(Example) A method for manufacturing a damping sheet according to the present invention will be described based on an example.

First, scaly talc, mica, pumice, etc. are dispersed and suspended in a large amount of water, and then powdered carbon black, clay, etc., and fibrous fillers such as rock wool, glass fiber, etc. are added. After mixing, silicone rubber latex is added and fixed to prepare a suspension having a solid content of 2 to 5%.

The suspension is made into a wet sheet using a fourdrinier or circular wire mesh in the same manner as in the papermaking process, dehydrated by gravity, suction filtration or press rolls, and dried under heat to change the sheet. .

Furthermore, the damping sheet 1 according to the present invention can be obtained by impregnating the paper sheet with liquid silicone and then drying and curing it.

The thickness of the paper sheet can be as thin as about 0.1 to 3 mm, or as thicker than that.

In the above embodiments, both scale-like and powder-like inorganic filler materials were mixed, but only one of them may be mixed with the fibrous inorganic filler material and silicone rubber. It goes without saying that the combination and mixing ratio of the damping sheets 1 affect the damping performance of the damping sheet 1, and therefore the composition of the mixed material may be appropriately selected depending on the usage conditions of the damping sheet.

Furthermore, the composition of the mixed material has an influence on the workability during papermaking, and the composition range of the mixture suitable for papermaking is as follows.

In other words, 1 to 4 fibrous filling materials such as rock wool and glass ma@
Preferably, the proportion is 0% (weight ratio, the same applies hereinafter), 1 to 80% of a scaly filler material such as talc or mica, or a powdery filler material such as carbon black or clay, and 1 to 30% of silicone rubber as a binding material. Moreover, vibration damping sheets l having various physical properties can be manufactured by using mixtures having the above composition range.

The liquid silicone may be any heat-curable or room-temperature-curable silicone that produces addition polymerization or condensation polymerization rubber or a cured product in the form of a kelp. 1 to 5 on the paper-made sheet
It is impregnated with 0% silicone, dried and cured, and the curing temperature for crosslinking is about 150°C.

In the papermaking process, the mixed material can be almost uniformly dispersed in water, but if necessary, a small amount of a dispersant and an adhesive may be added, and in order to increase the strength of the vibration damping sheet 1, Nitrile rubber or acrylic rubber latex may be mixed with the silicone rubber latex, or other paper strength enhancers may be added.

Further, the density of the paper sheet can be increased by further calendering, and the thickness can be increased from 0.1 to 2 m.
It can be compressed to about m.

Next, the structure of the composite damping material according to the present invention will be explained based on examples.

The vibration damping sheet 1 of the present invention is used as the vibration damping sheet laminated on the composite vibration damping material, and the nail stand steel plate is a carbon steel plate or stainless steel plate with a thickness of 0°1 to 3 mm.

First, the composite vibration damping material 5a shown in FIG.
It is a restrained type with damping sheets 1.1 pressure-molded on both sides.

As shown in FIGS. 1 and 2, the nail stand steel plate 2a has a large number of extruded protrusions 3a that protrude in a flower-shaped ↑-shaped manner arranged in a row on both sides alternately, and extruded holes 4a are formed inside the protrusions 3a. If damping sheets +-i and ■ are arranged from both sides of the claw steel plate 2a as shown in Fig. 3 and crimped to the phase 7F, one bulge is formed as shown in Fig. 4. Protrusion 3a
A composite vibration damping material 5a is obtained in which the vibration damping material 5a is embedded in the vibration damping sheet 1.

The composite damping material 5b shown in FIG. 8 is a non-restrictive type in which claw steel plates 2b, 2b are crimped and formed on both sides of the damping sheet 1.

As shown in FIGS. 5 and 6, each of the nail stand steel plates 2b and 2b has a large number of notched protrusions 3b protruding in an array on one side only, and has notched holes 4b formed therein, for vibration damping. If the nail stand steel plates 2b, 2b with the notch protrusions 3b facing inward are arranged from both sides of the sheet 1 as shown in FIG. The composite damping material 5b embedded in the damping sheet l is replaced.

Further, the composite vibration damping material 5c shown in FIG.
It is a non-restrictive type which is formed by pressure-bonding a pair of steel plates 2b and 2b.

In these composite damping materials 5a, 5b or 5c, 1
The extruded protrusion 3a of the claw-shaped steel plate 2a or the cut-out protrusion 3b of the claw-shaped steel plate 2b embedded in the first damping sheet 1 divides the adjacent damping sheet 1 in its width direction, and each Since the divided portion is held between the extruded projections 3a or the notched projections 3b, it is possible to prevent the damping seam 1-1 having viscosity 9 from flowing even in the event of a relatively wide temperature change or load fluctuation. .

Furthermore, the projections 3a and 3b are thin plates, each having an extrusion hole 4a.
Since the cutout holes 4b are adjacent to each other and have a leaf spring action, they have the effect of changing the resonance point of the nail stand steel plates 2a, 2b themselves, which are formed with a large number of cutout holes 4b.

In this way, the claw steel plates 2a and 2b have a structure suitable for laminating with the damping sheet 1 to form a composite type damping material of the Koto type or II Koto J (lj), and can be applied over a wide range. It can respond to temperature changes and load fluctuations.

Further, in the embodiment, the damping sheath 1-1 and the nail stand steel plate 2a,
2b and 2b were laminated by pressing with a press or a real roll, but both may be laminated using an adhesive or a pressure-sensitive adhesive.

The vibration damping sheet and composite vibration damping material according to the present invention will be further explained using comparative examples.

40 parts of sericite (sericite), 20 parts of kaolin clay, 15 parts of chopped rock wool, 1 part of paraamide fiber, 5 parts of solid content of acrylic latex, and solid content of silicone rubber latex. Paper is made from a suspension of 4 parts of 10 parts of composite material and 96 parts of wood, and 500g/m
' Paper-made sheet bound.

The paper sheet is impregnated with liquid silicone rubber in a toluene solution at a rate of 30% in terms of rubber, dried and hardened to form a vibration damping sheet AC, hereinafter referred to as A. ) was obtained.

30 parts of expanded pumice stone, 30 parts of frog's eye clay, 10 parts of ballastite clay, 91 parts of 3mm cut glass fiber
5 parts of solid content of nitrile rubber latex, 10 part of solid content of silicone rubber latex, and 4 parts of a mixed material consisting of 5 parts of solid content of silicone rubber latex and 86 parts of water.
It was made into a paper sheet.

Said Shozo Sea! * was impregnated with 30% liquid silicone rubber in toluene solution in terms of rubber, dried and hardened to obtain vibration damping sheet) B (hereinafter referred to as B).

Mosquito scoop A The above A and B are both made of a steel plate with a thickness of 0.25 mm and have a claw λ"l steel plate with a notch protrusion 3b on only one side (
Hereinafter, this will be referred to as one side. ) A nail stand steel plate with extruded protrusions 3a between 2b and 2b and alternately on both sides (hereinafter referred to as both sides) is crimped on both sides of 2a, and each has a J'9 of 0.
The composite vibration damping materials 5b and 5a were 9 mm and 1.1 mm.

Here, the protrusions 3b on "one side" are arranged in a square shape with an interval of 3.5 mm, the width of the notch hole 4b is 1.5 mm, and the protrusions 3b
In the case of "both sides", the vertical and horizontal arrangement intervals of the protrusion 3a were 3.0 mm and 27 mm, respectively, the diameter of the extrusion hole 4a was 1 mm, and the height of the protrusion 3a was 1 mm.

As another comparative example, a 0.38 mm thick claw steel plate made by Wolverine Co., Ltd. in the United States, which is commercially available as a vibration damping material, was coated with nitrile rubber and had a finished thickness of 0.84 mm.

The measurement results of the damping performance of the above specimens are as described in the attached measurement data (1) and (2).

Among the measurement items, the tangent loss tanδ is
Laboratories Ltd, manufactured by PL-Dyn
amic mechanical thermal A
Nalyser frequency 100Hz, temperature range O
Measured at ~200°C, loss factor η at room temperature,
Excitation conditions: 2°5G, frequency 200-200.
It was measured in the range of 000 Hz and calculated from the half width.

(Left below) Measured data (1 1T contact loss tanδ Measured temperature 0C050100150200A/Both sides/A
O, 1030, 0960, 1050, 1040,
103B/Both sides/BO, 0820°071 0.
082 0.073 0.066 One side/A/One side 0゜070 0.084 0.063 0.063 0.0
70 one side/B/one side 0.0?8 0.066 0.0
57 0.052 0.04B0.25mm steel plate, both sides 0.004 0.005 0.003 0.002
0.003A only 2.4 1.8 1.
5 1.4 1.4B only 0.18 0
,13 0,11 0,09 0.08Other comparative examples
0.020 0.018 0.017 0.018
0.01? (Manufactured by Ulparin) Completed measurement data (2) Loss coefficient η Resonance frequency Hz Measurement temperature °C Room temperature A/M side/A O, 282, 200B
/Both sides/BO, 281,800 One side/A
/One side 0.18 2,000One side/B/
One side 0.161,800Q, 25m steel plate 6 both sides A only 0.39 2,900B
Only 0.32 1,800 Other comparative examples 0.11 14.000 (manufactured by Ulharin) As is clear from the measured value of gate tangent loss tanδ,
In comparison with “Other Comparative Examples”, the vibration damping sheet according to the present invention) A,
Both B and the composite vibration damping material laminated with these materials have outstanding vibration damping performance, and there is almost no variation in the measured values in the temperature range of 0 to 200°C. It can be proven that the test sample can handle a wide temperature range.

Furthermore, according to the measured values of the loss coefficient η and the resonant frequency, all of the test products according to the present invention are on the lower frequency side by an order of magnitude compared to "other comparative examples", and have excellent vibration damping effects. It is clear that the

(Effects of the Invention) The effects of the method for producing a damping sheet, the damping sheet, and the composite damping material according to the present invention are as follows.

First, according to the manufacturing method of the damping sheet of the present invention, unlike the conventional method, the mixed material is suspended in water, so it is extremely easy to produce a homogeneous and thin-walled product. It is now possible to manufacture.

Furthermore, according to the vibration damping sheet of the present invention, due to the physical properties of the mixed material, the usable temperature range is as wide as 0 to 200°C, whereas conventional products are for room temperature and medium temperature (80 to 8°C) , high-temperature phase (80-100'O).

Therefore, the vibration damping sheet according to the present invention can reduce costs, and furthermore, it is possible to mass-produce long sheet-like products, so that the damping sheet can be manufactured at low cost.

Further, according to the composite vibration damping material according to the present invention, the vibration damping sheet has a wide usable temperature range of 0 to 200'O, and moreover, the protrusions of the laminated claw steel plates are formed on the vibration damping sheet. The structure is such that it is buried in a manner that separates and embraces the
Even with changes in temperature and load, and despite the viscoelasticity of the damping sheet, the flow can be prevented and the damping sheet will not easily peel off from the nail stand steel plate.

Furthermore, according to the composite vibration damping material of the present invention, since the numerous protrusions of the nail stand steel plate are adjacent to the communication holes and are thin plates, the plate spring action of these protrusions causes resonance of the nail stand steel plate itself. This has the effect of reducing the f1 river to avoid resonance and further improving the damping performance.

[Brief explanation of the drawing]

Figure 1 is a plan view of the claw plate with extruded protrusions formed on both sides of the intersection U, Figure 2 is a cross-sectional view taken along the line A sectional view showing the arrangement relationship,
Fig. 4 is an explanatory diagram showing the cross-sectional structure of the composite vibration damping material according to the present invention, Fig. 5 is a plan view of a Tsumega steel plate with notched protrusions formed on one side, and Fig. 6 is Y-Y in Fig. 5. Sectional view along the line, 7th
The figure is a cross-sectional view showing the arrangement relationship between the claw 1" steel plate and the damping sheet, FIG. 8 is an explanatory view showing the cross-sectional structure of another composite vibration damping material according to the present invention, and FIG. It is an explanatory view showing the cross-sectional structure of other composite vibration damping materials. l... Damping sheets 2a, 2b... Wind steel plate 3a...
Extruded protrusion 3b...! , IJ cutout projection 4d...Extrusion hole 4b...Notch hole 5a, 5b...Composite vibration damping material Il machine

Claims (1)

[Claims] 1. A fibrous inorganic filler material such as rock wool or glass fiber;
It is made by impregnating liquid silicone into a sheet material made of an inorganic filler material, either one of scales such as talc or mica, or powders such as carbon black or clay, and silicone rubber as a bonding material, and then hardening the sheet material. A vibration damping sheet featuring: 2. A fibrous inorganic filler material such as rock wool or glass fiber, one or both of scale-like talc, mica, etc. and powdery carbon black, clay, etc., and silicone rubber as a bonding material. A damping method characterized by forming a wet sheet material by using a wire mesh to form a 2 to 5% suspension of and dispersed in water, which is dehydrated and dried, and then impregnated with liquid silicone and cured. Method of manufacturing sheets. 3. In a composite vibration damping material consisting of a claw steel plate and a damping sheet, the damping sheet 1 contains a fibrous inorganic filler such as rock wool or glass fiber, a scaly material such as talc or mica, carbon black, clay, etc. The nail stand steel plate 2a has a large number of extruded protrusions 3a alternately arranged on both sides, and is made by impregnating and hardening a sheet made of an inorganic filler material (both or one of the powders) and silicone rubber as a bonding material with liquid silicone. A composite vibration damping material characterized in that extruded holes 4a are formed in an aligned manner and the vibration damping sheets 1 are crimped on both sides of a nail stand steel plate 2a. 4. In a composite damping material consisting of a claw steel plate and a damping sheet, the damping sheet 1 contains a fibrous inorganic filler such as rock wool or glass fiber, a scaly material such as talc or mica, carbon black, clay, etc. The nail stand steel plate 2b is made by impregnating liquid silicon into a sheet made of one or both of powdered inorganic filling materials and silicone rubber as a bonding material and hardening it. A composite structure characterized in that a notch hole 4b is formed in a protruding manner, and the nail stand steel plate 2b with the notch protrusion 3b facing inward is crimped to both sides or one side of the vibration damping sheet 1, respectively. Type vibration damping material.