JP2002179927A - Low impact resilient, vibration-damping polymer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polymer composition giving a molded product less prone to be deformed by a load because it retains a specified hardness in spite of low impact resilience, exhibiting cushioning properties and impact resistance and excellent in vibration-damping properties. SOLUTION: The polymer composition comprises, as a polymer constituting a matrix, one selected among polyurethanes, polyvinyl alcohols, polyvinyl chlorides, chlorinated polyethylenes, polyethylenes, polypropylenes, ethylene/vinyl acetate copolymers, polymethyl methacrylates, polystyrenes, styrene/butadiene/ acrylonitrile copolymers, polyvinyl formals, epoxy resins, phenol resins, urea resins, silicone resins, melamine resins, polyimides, acrylic rubbers(ACR), acrylonitrile/butadiene rubbers(NBR), styrene/butadiene rubbers(SBR), butadiene rubbers(BR), natural rubbers(NR), isoprene rubbers(IR), chloroprene rubbers(CR) and silicone rubbers(SR) or copolymers thereof, and, incorporated into the polymer, an active ingredient for increasing the dipole moment of the polymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer composition having low rebound resilience and vibration damping properties, and more particularly to molded articles such as products and members requiring cushioning, impact resistance and vibration damping properties, paints and adhesives. The present invention relates to a polymer composition suitable for an agent and the like.

[0002]

2. Description of the Related Art Conventionally, various types of polymers and polymer compositions (hereinafter referred to as polymers, etc.) are widely used in all fields such as automobile-related, equipment-related, housing / construction / civil engineering-related, electronics-related, sports / leisure / consumer goods-related. Have been. Depending on the field of use, the polymer may be used in an environment in which a large impact is applied to the polymer, etc., or in an environment with severe vibration.Polymers, etc., require advanced cushioning, impact resistance, or vibration damping properties. May be done.

Conventionally, flexible polyurethane foams have been widely used as polymers having cushioning properties. This kind of flexible polyurethane generally has a high rebound resilience of 40 to 80%, and particularly in applications such as sheets, there is an inconvenience that the user feels fatigue due to a hard touch. For this reason, a polyurethane foam has been improved to provide a cushioning material having low rebound resilience and cushioning properties (see JP-A-11-170469 and JP-A-10-52866). Conventionally, rubber materials have been widely used as polymers having vibration damping properties.

[0004]

However, Japanese Patent Application Laid-Open No. 11-170469 and Japanese Patent Application Laid-Open No.
In the cushioning material described in Japanese Patent Application Laid-Open No. H08-157, the rebound resilience is low, but the hardness is not enough. Therefore, the deformation of the molded body when a load is applied is large, and the foam structure may be broken. In addition, rubber materials have the best damping properties among general polymers, but they do not have sufficient damping properties when used alone as damping materials.For example, rubber materials are used as damping materials for buildings and equipment. It had to be used in a composite form, for example, by laminating steel sheets.

In view of the foregoing, the present invention has been made in view of the above circumstances, and has a low rebound resilience while maintaining a predetermined hardness. It is another object of the present invention to provide a polymer composition having excellent vibration damping properties.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention according to claim 1 comprises polyurethane, polyvinyl alcohol, polyvinyl chloride, chlorinated polyethylene, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and poly (vinyl acetate). Methyl methacrylate, polystyrene, styrene-butadiene-acrylonitrile copolymer, polyvinyl formal, epoxy resin, phenol resin, urea resin, silicone resin, melanin resin, polyimide, acrylic rubber (ACR), acrylonitrile-butadiene rubber (NBR), styrene -Butadiene rubber (SB
R), butadiene rubber (BR), natural rubber (NR), isoprene rubber (IR), chloroprene rubber (CR), silicon rubber (SR), or a copolymer thereof. The gist of the present invention is a low-rebound resilience and vibration-damping polymer composition, characterized in that an active ingredient for increasing the amount of dipole moment of the polymer is blended with the polymer.

According to a second aspect of the present invention, in the first aspect, the polymer as the base material is polyurethane, epoxy resin, phenol resin, urea resin, silicon resin, melanin resin, polyimide, acrylic rubber, acrylonitrile. A low resilience / damping polymer composition characterized by being a heat-resistant polymer selected from butadiene rubber, styrene-butadiene rubber, butadiene rubber, natural rubber, isoprene rubber, chloroprene rubber, and silicone rubber. Abstract.

[0008] The invention according to claim 3 is the invention according to claim 1 or 2.
In the above described invention, a low rebound resilience / damping polymer composition is characterized in that the active ingredient is blended at a ratio of 3 to 30% by weight based on the total weight of the low rebound resilience / damping polymer composition. The thing was the gist.

The invention described in claim 4 is the first to third aspects of the present invention.
Wherein the active ingredient is selected from the group consisting of a compound containing a benzothiazyl group, a compound containing a benzotriazole group, a compound containing a diphenylacrylate group, and a compound containing a benzophenone group.
The gist of the present invention is a low rebound resilience and vibration damping polymer composition characterized in that it is a kind or two or more kinds.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The low rebound resilience and vibration damping polymer composition of the present invention (hereinafter referred to as the present polymer composition) is prepared by blending a polymer serving as a base material with an active ingredient for increasing the amount of dipole moment. , Maintaining a predetermined hardness while having low rebound resilience, it is difficult for the structure of the molded product to be destroyed, and products and members that require cushioning, impact resistance, and vibration damping properties because of excellent vibration damping properties The present invention relates to a polymer composition suitable for molded articles, paints, adhesives and the like.

The polymer constituting the base material of the present invention is particularly preferably a polymer having polarity. Polyurethane, polyvinyl alcohol, polyvinyl chloride, chlorinated polyethylene, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polymethacrylic acid Methyl, polystyrene, styrene-butadiene-acrylonitrile copolymer, polyvinyl formal, epoxy resin, phenol resin, urea resin, silicone resin, melanin resin, polyimide, acrylic rubber (ACR), acrylonitrile
Butadiene rubber (NBR), styrene-butadiene rubber (SBR), butadiene rubber (BR), natural rubber (N
R), isoprene rubber (IR), chloroprene rubber (C
R), 1 selected from the group consisting of silicone rubber (SR)
Species or copolymers thereof.

The polymer composition comprises an active ingredient which increases the dipole moment of the polymer. Here, the relationship between the amount of dipole moment and low rebound resilience and vibration damping properties will be described. FIG. 1 shows an arrangement state of the dipoles 12 in the polymer 11 before impact energy and / or vibration energy (hereinafter simply referred to as energy) is transmitted. It can be said that the arrangement state of the dipole 12 is in a stable state. However, the transfer of energy causes the presence of the dipole 1 existing inside the polymer 11.
2, each dipole 12 inside the polymer 11 is placed in an unstable state as shown in FIG. 2, and each dipole 12 is brought into a stable state as shown in FIG. Try to go back.

At this time, energy is consumed. It is considered that energy is absorbed (low rebound resilience and vibration damping properties) through such displacement of the dipole inside the polymer 11 and energy consumption due to the restoring action of the dipole. The displacement of the dipole 12 means that each dipole 12 in the polymer 11 rotates or shifts in phase.

From the mechanism of such low rebound resilience and vibration damping properties, the polymer 1 shown in FIGS.
It is considered that as the amount of the dipole moment inside 1 increases, the low rebound resilience and damping property of the polymer 11 increase.

In the present polymer composition, the amount of dipole moment in the polymer is drastically increased by blending the active ingredient with the polymer of the base material. The active component is a component that dramatically increases the amount of dipole moment in the polymer, and the active component itself has a large dipole moment amount, or the active component itself has a small dipole moment amount. A component that can dramatically increase the amount of dipole moment in a polymer by blending an active component.

For example, the amount of the dipole moment generated in the polymer 11 under a predetermined temperature condition and an energy level can be adjusted under the same condition as shown in FIG. It will increase to three times or ten times. Along with this, the energy consumption due to the dipole restoring action when energy is transmitted will also increase dramatically, and it is thought that low rebound resilience and vibration damping properties that far exceed expectations will be generated. Can be

Active ingredients having such a function include:
N, N-dicyclohexylbenzothiazyl-2-sulfenamide (DCHBSA), 2-mercaptobenzothiazole (MBT), dibenzothiazyl sulfide (M
BTS), N-cyclohexylbenzothiazyl-2-sulfenamide (CBS), N-tert-butylbenzothiazyl-2-sulfenamide (BBS), N-oxydiethylenebenzothiazyl-2-sulfenamide (OBS), N, N-diisopropylbenzothiazyl-
One or more selected from compounds containing a benzothiazyl group, such as 2-sulfenamide (DPBS).

Another active ingredient is a benzotriazole mother nucleus in which an azole group is bonded to a benzene ring, to which a phenyl group is bonded, and 2- [2'-hydroxy-3 '-(3 ", 4"). , 5 ", 6" -tetrahydrophthalidemethyl) -5'-methylphenyl] -benzotriazole (2HPMMB), 2- (2'-hydroxy-5'-methylphenyl) -benzotriazole (2H
MPB), 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole (2HBMPCB), 2- (2'-hydroxy-3 ', 5'-di- one or two selected from compounds having a benzotriazole group such as t-butylphenyl) -5-chlorobenzotriazole (2HDBPCB);
Species or more.

Further, as another active ingredient, ethyl-2
-Cyano-3,3-diphenyl acrylate (ECDP
One or more selected from compounds having a diphenylacrylate group such as A), 2-hydroxy-4-methoxybenzophenone (HMBP),
One or more compounds selected from compounds containing a benzophenone group, such as hydroxy-4-methoxybenzophenone-5-sulfonic acid (HMBPS), can be mentioned.

The amount of the active ingredient is preferably 3 to 30% by weight based on the total weight of the polymer composition. For example, when the amount of the active ingredient is less than 3% by weight, the effect of adding the active ingredient to increase the dipole moment cannot be obtained, and the amount of the active ingredient is 30% by weight. If the ratio exceeds the above, the polymer of the base material and the active ingredient may not be sufficiently compatible with each other. Further, the amount of the active ingredient may be 5 to 15% by weight based on the total weight of the polymer composition. This is because high hardness can be maintained despite the rebound resilience being greatly reduced.

The polymer composition as described above can be used as a non-foamed molded article such as a product or a member, or as a foamed molded article, and can also be used as a paint or an adhesive. In particular, it can be widely used in fields where cushioning, impact resistance, and vibration damping properties are required. In the case of forming a foamed molded article, a conventionally known bubble generating means, that is, a bubble generating means using a pyrolytic foaming agent, a bubble generating means using a volatile solvent, or an inert gas under a high pressure is polymerized. Foaming can be carried out by using a bubble generating means that absorbs the inside and foams at room temperature.

Further, it can be used in a composite form in which molded articles of the present polymer composition are laminated. Further, the present polymer composition may contain a required amount of a filler such as mica, glass, glass fiber, carbon fiber or the like as long as the characteristics of low rebound resilience and vibration damping properties are not lost.

The amount of dipole moment varies depending on the kind of the above-mentioned base material polymer or active ingredient. Even when the same active component is used, the amount of dipole moment varies depending on the temperature at which energy is transmitted.
For this reason, taking into account the temperature and size when applied as molded products such as products and members, paints, adhesives, etc. that require cushioning, impact resistance or vibration damping, the largest bipolar at that time It is desirable to appropriately select and use a polymer or an active component of the base material so as to obtain a child moment amount. At this time, it is preferable to select an active ingredient having a value close to that value in consideration of the compatibility with the polymer of the base material, that is, the SP value.

Further, when the present polymer composition is used, in addition to the above-mentioned dipole moment, handling, availability, temperature performance (heat resistance and cold resistance), price and the like are taken into consideration. It is desirable to select different polymers and active ingredients. In particular, in the case of molded products such as products and members used in high-temperature environments such as places where motors are driven, paints, adhesives, etc., heat-resistant polymers such as polyurethane, epoxy resin, phenolic resin, and urea resin It is desirable to select a heat-resistant polymer such as silicone resin, melanin resin, polyimide, acrylic rubber, acrylonitrile-butadiene rubber, styrene-butadiene rubber, butadiene rubber, natural rubber, isoprene rubber, chloroprene rubber, or silicone rubber as a base material. .

[0025]

EXAMPLES Next, the present invention will be described with reference to examples, but the present invention is not limited to the following examples.

Ethyl-2-cyano-3, an active ingredient, was added to a base epoxy resin (manufactured by Nagase Chemtech Co., Ltd.).
A sheet was formed by mixing 3-diphenyl acrylate (hereinafter, referred to as ECDPA) and subjected to a test. In Examples, the amount of ECDPA was 3%, 5%, 7%, 10%, or 17% based on the total weight of the polymer composition of the present invention.
% And 25%, and those without ECDPA were used as comparative examples. Incidentally, the above percentages are all percentages by weight, and the same applies to the following.

The test was conducted on the above Examples and Comparative Examples.
The dynamic elastic modulus tan δ at 25 ° C., the rebound resilience and the hardness were measured. The measurement of the dynamic elastic modulus tan δ was performed using a measuring device manufactured by Leo Byron, DDV-25FP, and Orientic Co., Ltd. The result is shown in FIG.

FIG. 4 shows that in the comparative example, tan δ was 0.03.
However, in the case of adding 3% of ECDPA, 0.13
It was found that tan δ was significantly increased by the addition of the active ingredient.

Further, tan δ increases as the blending amount of ECDPA increases to 3%, 5%, and 7%.
In particular, it was confirmed that the mixing amount was dramatically increased from the example of 17%.

The rebound resilience is measured according to JIS K 6310.
The measurement was performed using a Lupke instrument specified in -11. It has a length of 356mm, a diameter of 2.7mm and a weight of 35
An iron bar of 0 g is aligned with the position of the scale 100, and freely dropped from this position, and applied to each of the sheet bodies of the example and the comparative example prepared to have a thickness of 12.70 ± 0.13 mm and a diameter of 29.0 mm, The scale of the height of the bar at the time of rebound was read, and this value was taken as the rebound resilience (%). The results are shown in FIG.

As can be seen from the test results shown in FIG.
The rebound resilience was 54% in the comparative example.
In the example where 3% of PA is blended, it is 41%, and ECDPA is further added.
Decreased depending on the amount of the compound. In particular, the rebound resilience was dramatically reduced from the case where the amount of ECDPA was 5%. From this, it was confirmed that the rebound resilience was reduced in the polymer composition of the present invention.

The hardness was measured in Examples and Comparative Examples.
The measurement was carried out according to JIS K-6301, and a relative comparison was made with the numerical value of the comparative example taken as 100%. FIG. 6 shows the result.

FIG. 6 shows that the hardness in the embodiment is ECD
Up to the example where the blending amount of PA is 10%, the decrease in hardness is almost negligible, and the polymer composition of the present invention has a low rebound resilience and a predetermined It was found that the hardness was maintained.

[0034]

The polymer composition of the present invention is used in a field where a high cushioning property, impact resistance or vibration damping property is required, for example, in an environment where a large impact is applied or an environment where a strong vibration is applied.
It is extremely useful when used as molded products such as products and members, paints, adhesives, etc., because it can exhibit excellent cushioning properties, impact resistance or vibration damping properties. Further, since the present polymer composition can maintain a predetermined hardness in spite of low rebound resilience, the structure of the product or member molded according to the present invention is not destroyed even when a load is applied.
Accordingly, the polymer composition is useful because it can be widely used in the fields of automobiles, aircraft, electronics, housing, construction, civil engineering, sports, leisure, and daily necessities.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a dipole in a polymer of a base material.

FIG. 2 is a schematic diagram showing a dipole state in a polymer of a base material when energy is applied.

FIG. 3 is a schematic diagram showing a dipole state in a low rebound resilience and vibration damping polymer composition when an active ingredient is blended.

FIG. 4 shows a polymer of a base material and tan δ of the present polymer composition.
FIG.

FIG. 5 is a graph showing the rebound resilience of a base polymer and the present polymer composition.

FIG. 6 is a graph showing the hardness of a polymer of a base material and the present polymer composition.

[Explanation of symbols]

 11 polymer 12 dipole

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Claims (4)

[Claims] 1. Polyurethane, polyvinyl alcohol, polyvinyl chloride, chlorinated polyethylene, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polymethyl methacrylate, polystyrene, styrene-butadiene-acrylonitrile copolymer, polyvinyl formal, epoxy Resin, phenol resin, urea resin, silicone resin, melanin resin, polyimide, acrylic rubber (ACR), acrylonitrile-butadiene rubber (NB
R), one selected from styrene-butadiene rubber (SBR), butadiene rubber (BR), natural rubber (NR), isoprene rubber (IR), chloroprene rubber (CR), silicon rubber (SR), or A low-rebound resilience / damping polymer composition, characterized in that these copolymers are used as a polymer constituting a base material, and the polymer is blended with an active ingredient for increasing the amount of dipole moment of the polymer. 2. The polymer as a base material is polyurethane, epoxy resin, phenol resin, urea resin, silicone resin, melanin resin, polyimide, acrylic rubber, acrylonitrile-butadiene rubber, styrene-butadiene rubber, butadiene rubber, natural rubber, isoprene. The low rebound resilience / damping polymer composition according to claim 1, wherein the polymer composition is a heat-resistant polymer selected from rubber, chloroprene rubber, and silicone rubber. 3. The low rebound according to claim 1, wherein the active component is blended at a ratio of 3 to 30% by weight based on the total weight of the low rebound resilience / damping polymer composition. Elastic and vibration damping polymer composition. 4. The active ingredient is at least one compound selected from a compound containing a benzothiazyl group, a compound containing a benzotriazole group, a compound containing a diphenylacrylate group, and a compound containing a benzophenone group. The low rebound resilience / damping polymer composition according to any one of claims 1 to 3, characterized in that: