JP3325600B2 - Rubber and / or plastic moldings with vibration damping and thermal conductivity - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat generating vibration such as a retractor and a motor built in an outdoor unit of an air conditioner, which is used in a cover case of a vibrating body such as a gear pump, a compressor, an air conditioner receiver and a motor retractor. The present invention relates to a rubber and / or plastic molded product which is used to fill a gap between the two when fixing a body to a cover case and which can suppress vibration and has excellent heat conductivity.

[0002]

2. Description of the Related Art Conventionally, heat generation and vibration of a heat generating vibrator such as a gear pump, a compressor, an air conditioner receiver, and a motor attached to various electric products have always been a problem. For this reason, in the prior art, in order to prevent vibration, for example, in a motor or the like, a method of wrapping a motor case with a felt-like soft material from the outside and further wrapping it with a lead or a rubber or plastic sheet having a large specific gravity from above is used. .

[0003]

However, the above-mentioned method of wrapping the case with a felt-like soft material from the outside and further wrapping the case with lead or a sheet having a large specific gravity has the following problems during construction. Have.

At the time of construction, a felt-like soft material must be securely bonded to the case, and this bonding work is difficult and workability is not good.

[0005] At the time of construction, since the entire case is wrapped, the felt and the sheet having a large specific gravity have a large capacity and are expensive in material.

[0006] After the construction, these heat generating vibrators are often used outdoors, and are exposed to the wind and rain for a relatively short period of time.
It is easy to cause breakage and peeling, so the anti-vibration performance is lost, and as a result, it becomes impossible to prevent the vibration of the heating vibrator,
Not good. Further, due to the above-mentioned reasons, the number of times that the work must be re-executed is increased, and an economic problem such as an increase in construction cost is also a bottleneck.

In addition, as another major problem, a method of wrapping the case with a felt-like soft material and further wrapping the case with lead or a sheet having a large specific gravity can hardly expect a heat radiation effect, but rather keeps heat. As a result, the heat generating vibrator itself must have heat resistance or the blower capacity needs to be increased for motors, etc., resulting in the heat generating vibrator itself being expensive and having a large capacity. I have.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a rubber and / or plastic molded product which can prevent vibration without hindering heat radiation of a heating vibrator.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a group consisting of a polymer mainly composed of rubber and / or plastic, a metal fine powder, (a) a metal oxide, a metal nitride and a filler containing any of these. (B) at least one filler selected from the group consisting of crystalline silica, silicon carbide, silicon oxide, and a filler containing any of these; And (b)
Is in the range of 7: 3 to 3: 7, and the filler is 0.5 Kcal / m. h. With a thermal conductivity of over ℃)
And a heat conductivity of 0.49 Kcal / m.2 with a loss elastic modulus of 2 × 10 ² η Kg / cm ² or more. h. The present invention solves the above-mentioned problems by obtaining a molded product having a composition of not less than ° C. and being molded into a desired shape.

[0010]

In the present invention, for example, by filling and using a gap between the heat generating vibrating body case and the heat generating vibrating body fixed thereto, necessary heat radiation from the vibrating body case is not hindered, and It has the effect of preventing vibration.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 exemplify shapes of the rubber and / or plastic molded products having vibration damping properties and thermal conductivity of the present invention when molded into a block shape (FIG. 1), a sheet or a tape shape (FIG. 2). FIG. 3 is a perspective view showing a polymer 2 mainly composed of rubber and / or plastic, a metal fine powder 3 and a thermal conductivity of 0.5 Kcal / m. h. At least one filler selected from the group consisting of (a) metal oxides, metal nitrides and fillers containing any of these, and (b) crystalline silica, silicon carbide, silicon oxide or A filler 4 selected from at least one filler selected from the group consisting of fillers containing any of these is uniformly mixed and dispersed, and a vulcanizing agent is mixed if necessary. A rubber and / or plastic molded article 1 having desired vibration damping performance and thermal conductivity in a semi-vulcanized or vulcanized state.

FIGS. 3 and 4 show rubber and / or rubber having vibration damping properties and thermal conductivity of the present invention molded into a sheet or tape.
Or, another example of a plastic molded product (FIG. 2), in which two molded products 1 cut to a desired width and length when used.
FIG. 5 is a cross-sectional view of a laminated molded product (FIG. 3) in which a metal band 5 is interposed therebetween or a laminated molded product (FIG. 4) disposed on one surface of one molded product 1.

FIGS. 5 to 11 are cross-sectional views of a laminated molded product as an example of the present invention, in which the pressure-sensitive adhesive layer 6 is provided on both surfaces or one surface of FIGS.

FIG. 12 is a partially cut-away perspective view showing an embodiment in which the retractor 8 incorporated in the outdoor unit 7 is filled between the bottom plate 7a and the retractor 8 when the retractor 8 is fixed to the outdoor unit bottom plate 7a. In the figure, 7b is a heat radiating hole provided in the bottom plate 7a.

FIG. 13 is a partially cutaway perspective view showing an embodiment in a state where the sheet or tape-like molded product 1 (FIG. 2) of the present invention is appropriately cut and set to the cover 9 when attached to an existing motor cover. It is.

FIGS. 14 to 20 are perspective views showing other examples of the molded shape of the present invention.

The rubber as the polymer 2 used for the rubber and / or plastic molded article 1 having vibration damping property and thermal conductivity according to the present invention is, for example, natural rubber, isoprene rubber, butadiene rubber, butyl rubber, nitrile rubber, acrylic rubber. , Chloroprene rubber, ethylene-propylene rubber, silicone rubber, polyisobutylene, butadiene
Styrene rubber, polysulfide rubber, norbornene rubber, urethane rubber, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, chlorinated polyethylene, etc., and plastics such as polyethylene resin, polystyrene resin, polyvinyl chloride resin , Polypropylene resin, polyester resin, urethane resin, ABS resin, and the like. Further, as a blend of rubber and plastic, for example, a blend of nitrile rubber, butyl rubber, chloroprene rubber, a blend of ethylene propylene rubber and polyethylene resin, or a blend of nitrile rubber and polyvinyl chloride Blends are preferably used.

In the filler 4 having thermal conductivity added to the base polymer, (a) the filler includes, for example, metal oxides such as aluminum oxide, lead oxide and magnesium oxide, aluminum nitride, boron nitride, and the like. Metal nitrides such as magnesium nitride, and (b) fillers include crystalline silica, silicon carbide, and silicon oxide.
These fillers have a thermal conductivity of 0.5 Kcal / m.
h. A material having a thermal conductivity of not less than ° C is used. The filler (a) and the filler (b) are mixed in a mixing ratio of 3: 7 to 7: 3 so that the molded article 1 has a desired thermal conductivity.

If necessary, other additives such as a softening agent such as a liquid rubber and a process oil, a tackifier such as a rosin and a petroleum resin, a pigment, a vulcanization accelerator, a vulcanizing agent and an antioxidant may be appropriately used. Selected and used.

The metal fine powder 3 to be mixed and dispersed in the base polymer together with the filler 4 is, for example, gold, silver, copper, lead, aluminum, manganese, nickel, chromium, zinc or a silicon alloy thereof. It is.

As shown in FIGS. 3 and 4, the metal band 5 used in the case of a molded product having a sheet or tape shape in which the metal band 5 is embedded or provided on one side is, for example, aluminum, copper, iron or the like. A plate, a sheet, and a film are used.

Further, the pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer 6 used in the molded article 1 as illustrated in FIGS. 5 to 11 may be any of a hot-melt type, a solvent type and an aqueous type. This layer 6 has a thickness of 10
It is necessary to have a thickness in the range of μ to 100 μ, that is, a thickness that does not hinder the vibration damping effect of the molded article 1. 5 to 1.
In FIG. 1, only the case where the pressure-sensitive adhesive layer 6 is provided on the sheet or tape-like molded product (FIG. 2) is exemplified.
The pressure-sensitive adhesive layer 6 can be provided partially or entirely on the surface or inner surface of a molded product having another shape, for example, a block shape or the like.

Next, the filler 4 and the metal fine powder 3 in the molded article 1 having a very important function in the present invention.
Will be described in detail. That is, it has already been clarified by the present inventors that by adding the metal fine powder 3 to the elastic polymer 2 of rubber and / or plastic, it is possible to obtain a flexible sheet having a large specific gravity and damping properties. (Japanese Patent Publication No. 60-25232, Japanese Utility Model Application 3)
-99247). However, the rubber of the present invention and / or
Alternatively, the plastic molded article 1 needs to have thermal conductivity in addition to vibration damping properties. For example, as for the thermal conductivity, as shown in the embodiment of FIG. 12, heat generated from a heating element body such as a retractor (resistor) is stored between the bottom plate 7 a of the outdoor unit 7 and the retractor (resistor) 8. It is necessary to radiate heat smoothly from the radiating holes 7b attached to the bottom plate 7a of the outdoor unit 7 without performing. In addition, it is difficult to sufficiently satisfy the required quality by adding only the metal fine powder 3 from the viewpoints of product workability, physical properties, and the like.

As a result of intensive studies on this point, the present inventors have found that, by blending a metal oxide or an inorganic filler containing a metal oxide with the metal fine powder 3 in the base polymer, the thermal conductivity thereof can be improved. (Japanese Utility Model Laid-Open No. 3-99247). However, subsequent studies have shown that the inventors have replaced metal oxides or fillers containing metal oxides with metal fine powder 3 by metal nitrides or crystalline silica, silicon oxide, silicon carbide or fillers containing these. It was found that the thermal conductivity effect obtained was equal to or slightly higher than the above. Further, the present inventors have proposed that (a) at least one filler selected from the group consisting of metal oxides, metal nitrides and fillers containing any of these, and (b) crystalline silica, silicon oxide, By adding together with the metal fine powder 3 in combination with silicon and at least one filler selected from the group consisting of fillers containing any of these, better thermal conductivity than the former two can be obtained. They have found what they have gained and arrived at the present invention.

For example, a polymer 2 mainly composed of rubber and / or plastic has a thermal conductivity of 0.5 Kcal.
/ M. h. At least one filler selected from the group consisting of: (a) metal oxides, metal nitrides, and fillers containing any of these, and (b) crystalline silica, silicon carbide, Using a Banbury, kneader, open roll or the like, uniformly mix and disperse the filler 4 selected from at least one filler selected from the group consisting of silicon oxide and a filler containing any of these. Then, or at the same time, the metal fine powder 3 capable of imparting vibration damping property and thermal conductivity is gradually added and compounded, and then the obtained compound is formed into a desired shape using an extruder or a calender or a press. By molding and cutting if necessary, the thermal conductivity is 0.49 Kcal / m. h. The present invention succeeded in obtaining a molded product satisfying the required quality of not less than ° C and a loss elastic modulus of not less than 2 × 10 ² ηKg / cm ² .

In order to obtain sufficient vibration damping properties for the intended use of the present invention, it is particularly preferable to use a soft molded article 1 having a high specific gravity of 1.8 or more. Also, in order to have thermal conductivity, it is necessary to first modify the poor thermal conductivity of the polymer used, and for this purpose it has a thermal conductivity several times higher than the polymer used, In addition, it is necessary to add a compounding agent which has good compatibility with the polymer and can be uniformly dispersed in the polymer. Further, in terms of quantity, a compounding agent which does not provide a vibration damping effect unless added in a large amount which detracts from the elastic properties of the polymer is not preferable.

From this point, the inventors have repeated trial and error by experiment, and as a result, it is possible to improve the heat-defective conductive property of the polymer and to impart a vibration damping property, and it is possible to easily form it into a desired shape in processing. Has a thermal conductivity of 0.5 Kcal / m. h. Having a thermal conductivity of at least 0.degree.
and at least one filler selected from the group consisting of (a) metal oxides, metal nitrides, and fillers containing any of these, and (b) crystalline silica, silicon carbide, silicon oxide, and It is preferable to use together with at least one filler selected from the group consisting of fillers containing any of these, and furthermore, by adding a metal fine powder to this blend, it is flexible and has a specific gravity of 1 It was found that a molded article 1 having a desired thermal conductivity and vibration damping property having a high specific gravity of at least 0.8 was obtained. The total amount of the filler is 5 parts per 100 parts by weight of rubber and / or plastic.
The range of 0 to 200 parts by weight is desirable, and the mixing ratio of both fillers is suitably in the range of 7: 3 to 3: 7. If the amount is less than 50 parts by weight, the poor thermal conductivity of the polymer cannot be improved, and if it is more than 200 parts by weight, not only the elastic properties of the polymer cannot be maintained due to the addition of the metal fine powder, but also the processing at the time of molding the composition. This makes the sex difficult. When the compounding ratio exceeds the range of 7: 3 to 3: 7, it is difficult to obtain a synergistic effect of both fillers. Incidentally, fillers having an average particle diameter of less than 0.01 μm have an apparent specific gravity that is too low to be blended with the polymer, and fillers having an average particle diameter of more than 30 μm significantly impair the reinforcing effect of the polymer. It is not preferable.

On the other hand, the amount of the metal fine powder to be added is 100 to 4 parts by weight based on 100 parts by weight of rubber and / or plastic in a composition containing 50 to 200 parts by weight of a filler.
00 parts by weight is preferred. This is because if the amount is less than 100 parts by weight, the specific gravity of the obtained composition is too light to obtain the desired vibration damping properties, and if it is more than 500 parts by weight, the desired physical properties cannot be maintained due to the high filling number. The particle size is 1
If it is less than 00 mesh, the average particle size becomes too large, the compatibility with the polymer is poor, and the dispersion is poor. The average particle size is relatively small, and the compatibility with the compound and the dispersion are good.
More than 00 mesh is appropriate. On the other hand, as the suitable vibration damping property and thermal conductivity for this application, as a vibration damping property, a loss elastic modulus of 2 × 10 ² ηKg / cm ² or more and a heat conductivity of 0.49 Kcal / mh. C. or higher. That is, a molded product having a loss elastic modulus of 2 × 10 ² η Kg / cm ² or less has insufficient vibration damping properties for use, and is 0.49 Kcal / m. h. For example, in the case of a thermal conductivity of not more than 0 ° C., as shown in FIG.
It is not possible to quickly release heat from the heat radiating holes 7b provided in the bottom plate 7a, and the internal temperature of the outdoor unit, that is, the heat generating vibrator case 7 is increased due to the heat retaining effect of the molded product 1. It is.

More specifically, a sheet-like molded product according to another embodiment of the present invention shown in FIGS. 3 and 4 has a structure in which the metal band 5 is provided internally or has a structure on one side.
Combined with good thermal conductivity, further enhances the thermal conductivity effect of the sheet or tape-shaped molding.

In the other vibration-damping and heat-conductive sheet-shaped moldings of the present invention shown in FIGS. 5 to 11, the pressure-sensitive adhesive layer 6 is applied to one or both surfaces thereof, so that the bottom plate 7a or the retractor 8 Alternatively, it has good adhesion to both, and is more effective in preventing vibration resonance of the case due to vibration from the vibrating body 8 such as a retractor.

Experimental example. To 100 parts by weight of nitrile rubber, 30 parts by weight of crystalline silica having an average particle diameter of 10 μm and 30 parts by weight of aluminum oxide having an average particle diameter of 10 μm were uniformly mixed and dispersed using a Banbury. The mixture was gradually added with a kneader and uniformly mixed and dispersed to obtain an NBR compound. Next, this composition was sheeted to about 5 mm by an open loan, and the obtained sheets were overlapped and pressed to form a block-shaped molded product (Experimental Example 1) having a thickness of 15 mm, a length of 75 mm and a width of 50 mm as shown in FIG. Obtained. The NBR composition obtained in the same manner was used to obtain a 2.
After cutting a sheet-like molded product sheeted by a calendar to 0 mm into a length of 75 mm and a width of 50 mm, this is laminated on both surfaces of an aluminum plate (11 mm thick, 75 mm long and 50 mm wide 50 mm) and laminated as shown in FIG. (Experimental example 2) was obtained. Further, a solvent type acrylic pressure-sensitive adhesive (50μ) was applied to both sides (front and back) of the block-shaped molded product of Experimental Example 1 to obtain a glued molded product (Experimental Example 3) as shown in FIG. The thermal conductivity of these molded products was measured, and these molded products were placed on two iron plates (SPCC steel plate thickness 0.8 mm).
The loss elastic modulus was measured, and the results in Table 1 were obtained. For reference, when metal oxide, iron powder crystalline silica, and iron powder were mixed in the same number of parts as in Experimental Example 1 and prepared in the same manner as in Experimental Example 3 (Reference 1) and (Reference 2), pure rubber was mixed (filler). The table also shows the measurement results of the loss elastic modulus (Reference 4) when a vulcanized sheet (without iron powder) is used (Reference 3) and when an iron plate is simply stacked without sandwiching a molded product. It is shown in FIG.

[0032]

[Table 1]

As is clear from Table 1, it was confirmed that the molded article of the present invention had an excellent vibration damping effect and a good thermal conductivity.

[0034]

As described above, the rubber and / or plastic molded article having vibration damping properties and thermal conductivity of the present invention can be used with a filler having thermal conductivity in a polymer mainly composed of rubber and / or plastic. It is a molded product in which fine metal powder is uniformly blended.Because of excellent vibration damping and thermal conductivity, the entire case of a conventional vibration heating element is wrapped in a felt-like soft material, and lead or specific gravity is further placed on it. In comparison with the method of wrapping in a sheet or the like having a large size, the following effects are exhibited. At the time of construction, when fixing the vibration heating element in the cover case to, for example, the case bottom plate, the work is completed simply by filling a molded product between the bottom plate and the vibration heating element, and the conventional method of covering the entire cover case The workability is dramatically improved as compared with. In addition, since it is only necessary to use a molded product inside the cover case, the cover case has a small merit in terms of capacity, can save material, and has a great merit of not taking up a space for installation. After construction, the heat generating vibrator is often used outdoors, but even if it is exposed to the wind and rain, since the molded article of the present invention is filled in the cover case, it does not age and cracks or set Since the heat radiation effect can be maintained without storing heat against the heat generated from the heat generating body, the life of the heat generating vibrator is extended. Further, for the above-mentioned reason, it is not necessary to perform the work again, so that the construction cost is extremely reduced and the economy is improved. In addition, with respect to heat generated from the heating element body, which is another problem, the conventional method can hardly expect a heat radiation effect, but rather results in keeping heat. Since it is a good molded product, rapid heat radiation to the outside of the case through the heat radiation holes can be realized. The molded product of the present invention has a soundproofing effect as an additional effect.

[Brief description of the drawings]

FIG. 1 is a perspective view of a block-shaped molded product showing one embodiment of the present invention.

FIG. 2 is a perspective view of a sheet or tape-like molded product showing one embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a structure in which a metal band is included in the structure shown in FIG. 2;

FIG. 4 is a cross-sectional view showing the one shown in FIG. 2 with a metal band provided on one side.

FIG. 5 is a cross-sectional view showing the one of FIG. 2 provided with an adhesive layer on one side.

FIG. 6 is a cross-sectional view showing a structure in which pressure-sensitive adhesive layers are provided on both surfaces of the structure shown in FIG. 2;

FIG. 7 is a cross-sectional view showing the one of FIG. 3 provided with an adhesive layer on one side.

FIG. 8 is a cross-sectional view showing a structure in which pressure-sensitive adhesive layers are provided on both surfaces of the structure shown in FIG.

FIG. 9 is a cross-sectional view showing a structure in which an adhesive layer is provided on one surface of the structure shown in FIG.

FIG. 10 is a cross-sectional view showing a structure in which pressure-sensitive adhesive layers are provided on both surfaces of FIG.

FIG. 11 is a cross-sectional view showing a pressure-sensitive adhesive layer provided on one side opposite to that of FIG. 9;

FIG. 12 is a diagram showing an example in which the block-shaped molded product of FIG. 1 is constructed in an outdoor unit.

13 is a view showing a state in which the sheet or tape-like molded product of FIG. 2 is applied to an existing motor cover.

FIG. 14 is a perspective view of a block-shaped molded product showing another embodiment of the present invention.

FIG. 15 is a perspective view of a block-shaped molded product showing another embodiment of the present invention.

FIG. 16 is a perspective view of a block-shaped molded product showing another embodiment of the present invention.

FIG. 17 is a perspective view of a cylindrical molded product showing another embodiment of the present invention.

FIG. 18 is a perspective view of a sheet-like molded product showing another embodiment of the present invention.

FIG. 19 is a perspective view of a sheet-like molded product showing another embodiment of the present invention.

FIG. 20 is a perspective view of a sheet-like molded product showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molded product 2 Polymer 3 Fine metal powder 4 Filler 5 Metal strip 6 Adhesive layer 7 Outdoor unit 7a Bottom plate of outdoor unit 7b Radiation hole provided in bottom plate of outdoor unit 8 Retractor built in outdoor unit 9 Motor cover

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI C08K 3/34 C08K 3/34 C08L 21/00 C08L 21/00 F16F 15/02 F16F 15/02 Q (56) Reference Hei 3-99247 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08L 1/00-101/16 C08K 3/00-13/08 B32B 25/04 F16F 15/02

Claims (6)

(57) [Claims] 1. A polymer mainly composed of rubber and / or plastic, a metal fine powder and at least one selected from the group consisting of (a) a metal oxide, a metal nitride and a filler containing any of these. Seed filler and (b)
The compounding ratio of at least one filler selected from the group consisting of crystalline silica, silicon carbide, silicon oxide, and a filler containing any of these, ((a) and (b) is 7: 3 to 3: 7 range with 0.5 Kcal filler.
/ M. h. (Having a thermal conductivity of at least 100 ° C. or higher), and having a loss elastic modulus of 2 × 10 ² ηKg
/ Cm ² or more and a thermal conductivity of 0.49 Kcal / m. h.
A rubber and / or plastic molded article having a vibration damping property and a heat conductivity, characterized by having a vibration damping property and a heat conductivity of not less than ° C. 2. The method according to claim 1, wherein the amount of the thermally conductive filler compounded with the metal fine powder is 50 to 200 parts by weight based on 100 parts by weight of rubber and / or plastic. 1. A rubber and / or plastic molded product having vibration damping properties and thermal conductivity. 3. The metal fine powder blended with the filler having thermal conductivity is a metal fine powder having a particle size of 100 mesh or more, and the mixing amount thereof is based on 100 parts by weight of rubber and / or plastic. The rubber and / or plastic molded product having a vibration damping property and a thermal conductivity according to any one of claims 1 and 2, which is 100 to 400 parts by weight. 4. A molded rubber and / or plastic product having vibration damping and thermal conductivity according to claim 1, wherein the specific gravity is 1.8 or more. 5. The rubber and / or rubber having vibration damping properties and thermal conductivity according to claim 1, wherein an adhesive layer is provided on both surfaces or at least one surface of the molded product. Plastic moldings. 6. The molded article according to claim 1, wherein the molded article is a sheet-shaped or tape-shaped molded article, and is a laminated molded article having a metal band therein or disposed on one side. Rubber and / or plastic moldings having vibration and thermal conductivity.