JP4766741B2 - Non-rebound resilience / damping polymer composition - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a low-rebound resilience / damping polymer composition, and in particular, a polymer composition suitable for molded articles such as products and members, paints, adhesives and the like that require cushioning, impact resistance, and damping properties. Related to things.
[0002]
[Prior art]
Conventionally, various polymers and polymer compositions (hereinafter referred to as polymers) have been widely used in various fields such as automobile-related, equipment-related, housing / construction / civil engineering-related, electronics-related, sports / leisure / daily necessities. Depending on the field of use, it may be used in an environment where a large impact is applied to the polymer, etc., or in an environment where the vibration is intense, and the polymer, etc., requires a high level of cushioning, impact resistance, or vibration control. May be.
[0003]
Conventionally, soft polyurethane foam has been widely used as a polymer having cushioning properties. This type of flexible polyurethane generally has a high resilience of 40 to 80%. In particular, in applications such as sheets, there is a disadvantage that the user feels tired due to a hard feel. Therefore, polyurethane foam has been improved, and cushion materials having low resilience and cushioning properties have been provided (see JP-A-11-170469 and JP-A-10-52866). Conventionally, rubber materials have been widely used as vibration-damping polymers.
[0004]
[Problems to be solved by the invention]
However, in the cushion materials described in JP-A-11-170469 and JP-A-10-52866, the rebound resilience is low but the hardness is not sufficient, so that the deformation of the molded body when a load is applied is large. The foam structure may be destroyed. In addition, although rubber materials have the highest damping properties among general polymers, they are not sufficiently damped to be used alone as damping materials. For example, rubber materials are used as damping materials for buildings and equipment. It had to be laminated and used in a composite form.
[0005]
Therefore, the present invention has been made in view of the above circumstances, and in order to maintain a predetermined hardness while having low rebound resilience, the molded body is hardly deformed by a load, has cushioning properties and impact resistance, and is further excellent. It is an object to provide a polymer composition having vibration damping properties.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides an epoxy resin as a polymer constituting a base material , and ethyl-2-cyano-3,3-diphenyl acrylate as an active ingredient that increases the amount of dipole moment of the polymer in the polymer. The gist of the present invention is a low rebound resilience / damping polymer composition characterized in that is blended at a ratio of 5 to 15% by weight .
[0007]
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[0008]
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[0009]
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[0010]
DETAILED DESCRIPTION OF THE INVENTION
The low rebound resilience / damping polymer composition (hereinafter referred to as the present polymer composition) of the present invention is blended with an active ingredient that increases the amount of dipole moment in a polymer as a base material, while having low rebound resilience. Molded products such as products and parts, paints, and adhesives that require cushioning, impact resistance, and vibration damping because the structure of the molded product is not easily destroyed to maintain the specified hardness and is excellent in vibration damping. The present invention relates to a polymer composition suitable for an agent.
[0011]
An epoxy resin is used for the polymer constituting the base material of the present invention.
[0012]
In the polymer composition, an active ingredient that increases the dipole moment is blended with the polymer. Here, the relationship between the amount of dipole moment, the low rebound resilience, and the damping property will be described. FIG. 1 shows an arrangement state of the dipole 12 inside 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, when energy is transmitted, the dipole 12 existing inside the polymer 11 is displaced, and as shown in FIG. 2, each dipole 12 inside the polymer 11 is placed in an unstable state. Thus, each dipole 12 attempts to return to a stable state as shown in FIG.
[0013]
At this time, energy consumption occurs. It is considered that energy absorption (low rebound resilience and vibration damping) occurs through such energy displacement due to the displacement of the dipole inside the polymer 11 and the restoring action of the dipole. Note that the occurrence of displacement in the dipole 12 means that each dipole 12 in the polymer 11 rotates or the phase shifts.
[0014]
From the mechanism of occurrence of such low rebound resilience and vibration damping properties, the greater the amount of dipole moment in the polymer 11 as shown in FIGS. 1 and 2, the lower the rebound resilience possessed by the polymer 11 and It is thought that the vibration control will be high.
[0015]
In this polymer composition, the amount of dipole moment in the polymer is dramatically increased by blending the active ingredient with the polymer of the base material. This active component is a component that dramatically increases the amount of dipole moment in the polymer. The active component itself has a large dipole moment amount, or the active component itself has a small dipole moment amount. By blending an active ingredient, it refers to a component that can dramatically increase the amount of dipole moment in the polymer.
[0016]
For example, the amount of dipole moment generated in the polymer 11 under a predetermined temperature condition and energy magnitude is 3 times under the same condition as shown in FIG. It will increase to 10 times that amount. Accordingly, the energy consumption by restoring action of dipoles when the energy is transmitted also becomes possible to remarkably increase, believed to be much lower impact resilience and damping properties will occur beyond the predicted It is done.
[0017]
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[0018]
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[0019]
As an active ingredient with such a function, Ru with ethyl 2-cyano-3,3-diphenylacrylate.
[0020]
The amount of the active ingredient is 5 to 15% by weight based on the total weight of the polymer composition . This is because, for example, when the amount of the active ingredient is less than 5 % by weight, a sufficient effect by adding the active ingredient to increase the amount of dipole moment cannot be obtained, and the amount of the active ingredient is 15 % by weight. This is because the polymer of the base material and the active ingredient may not be sufficiently compatible. Furthermore, the amount of active ingredient that 5 to 15% by weight relative to the total weight of the polymer composition, rebound is because it maintains a high hardness despite significantly reduced.
[0021]
The present polymer composition as described above can be used as a non-foamed molded product such as a product or member, or as a foamed molded product, and can also be used as a paint or an adhesive. It can be widely used in fields where impact resistance and vibration control are required. In the case of a foamed molded product, 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 is polymerized under high pressure. It can be foam-molded using a bubble generating means that absorbs it and foams it at room temperature.
[0022]
Moreover, it can also be used with the composite form which laminated | stacked the molding by this polymer composition. Furthermore, the present polymer composition can be added with a required amount of fillers such as mica, glass, glass fiber, carbon fiber and the like within a range not losing the low rebound resilience and vibration damping properties .
[0023]
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[0024]
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[0025]
【Example】
EXAMPLES Next, although an Example is given and this invention is demonstrated, this invention is not limited to a following example.
[0026]
Ethyl-2-cyano-3,3-diphenyl acrylate (hereinafter referred to as ECDPA) was blended as an active ingredient into an epoxy resin (manufactured by Nagase Chemtech Co., Ltd.) as a base material, and a sheet body was molded and used for the test. In Examples, the amount of ECDPA is 3%, 5%, 7%, 10%, 17%, and 25% with respect to the total weight of the polymer composition of the present invention, and those without ECDPA are compared with Comparative Examples. did. The above percentages are all by weight and the same applies to the following.
[0027]
In the test, the dynamic modulus of elasticity tan δ, rebound resilience, and hardness at 25 ° C. were measured for the above Examples and Comparative Examples. The measurement of the dynamic elastic modulus tan δ was performed using a measuring device made by Leobyron, DDV-25FP, orientic corporation. The results are shown in FIG.
[0028]
4. From FIG. 4, it was found that tan δ was 0.03 in the comparative example, but 0.13 in the example in which 3% of ECDPA was blended, and tan δ increased significantly with the blending of the active ingredient.
[0029]
In addition, it was confirmed that tan δ increased as the blending amount of ECDPA increased to 3%, 5%, and 7%, especially from the example where the blending amount was 17%. .
[0030]
The impact resilience was measured using a Lüpke-type instrument defined in JIS K 6310-11. This was done by adjusting a steel bar having a length of 356 mm, a diameter of 2.7 mm, and a weight of 350 g to the position of the scale 100 and allowing it to fall freely from this position to a thickness of 12.70 ± 0.13 mm and a diameter of 29.0 mm. The scale of the height of the iron bar when rebounding was applied to each of the sheet bodies of the example and the comparative example, and this value was defined as the resilience (%). The results are shown in FIG.
[0031]
As can be seen from the test results shown in FIG. 5, the rebound resilience was 54% in the comparative example, but 41% in the case where 3% of ECDPA was blended, and further decreased depending on the blending amount of ECDPA. It was. In particular, the rebound resilience dramatically decreased from the example where the ECDPA content was 5%. From this, it was confirmed that the rebound resilience was lowered in the polymer composition of the present invention.
[0032]
The hardness was measured according to JIS K-6301 for the examples and the comparative examples, and relative comparison was made with the numerical value of the comparative example being 100%. The results are shown in FIG.
[0033]
From FIG. 6, the hardness in the examples shows almost no decrease in hardness until the examples in which the blending amount of ECDPA reaches 10%, and the polymer composition of the present invention is low in combination with the result of the resilience. It was found that a predetermined hardness was maintained while having rebound resilience.
[0034]
【The invention's effect】
This polymer composition is used in fields where high cushioning, impact resistance or vibration control is required, such as in environments where a large impact is applied or in environments where intense vibrations occur. Use as an adhesive or the like is extremely useful because it can exhibit excellent cushioning properties, impact resistance or vibration damping properties. In addition, since the polymer composition can maintain a predetermined hardness despite its low impact resilience, the structure of the product or member molded according to the present invention is not destroyed even when a load is applied. Therefore, this polymer composition is useful in a wide range of fields such as sports, leisure and daily necessities as well as the automobile field, aircraft field, electronics field, housing / construction / civil engineering field and the like.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a dipole in a polymer of a base material.
FIG. 2 is a schematic diagram showing the state of a dipole in a base polymer when energy is applied.
FIG. 3 is a schematic diagram showing the state of a dipole in a low rebound resilience / damping polymer composition when an active ingredient is blended.
FIG. 4 is a graph showing a polymer of a base material and tan δ of the present polymer composition.
FIG. 5 is a graph showing the rebound resilience of the matrix polymer and the present polymer composition.
FIG. 6 is a graph showing the hardness of a base polymer and the present polymer composition.
[Explanation of symbols]
11 Polymer 12 Dipole

Claims (1)

An epoxy resin is used as a polymer constituting the base material, and ethyl-2-cyano-3,3-diphenyl acrylate is blended in an amount of 5 to 15% by weight as an active ingredient for increasing the amount of dipole moment of the polymer. A low rebound resilience / damping polymer composition.

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