JP2007146006A - Dampingness-imparting agent and damping material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dampingness-imparting agent capable of sufficiently exerting damping performance owing to having heat resistance, and to provide a damping material sufficiently exerting its own damping performance. <P>SOLUTION: The dampingness-imparting agent comprises N,N'-di-2-naphthyl-p-phenylenediamine as active ingredient. This dampingness-imparting agent is to be used by mixing with a resin material, imparting the resin material with dampingness. The damping material comprises a resin material as matrix and N,N'-di-2-naphthyl-p-phenylenediamine as the active ingredient of the above dampingness-imparting agent. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an attenuating agent that imparts a damping property to a resin material and an attenuating material that exhibits the attenuating property.

Conventionally, compounds having a benzotriazole group or the like are known as damping components that impart damping properties such as damping properties to resin materials (see Patent Document 1). This kind of attenuating component is used by being mixed with a molten resin material. This damping property imparting component is a component that imparts the performance of damping the vibration energy, that is, the damping property, for example, by converting the vibration energy into heat energy.
International Publication No. 97/42844 Pamphlet

  The attenuating component described in the background art may be thermally decomposed depending on the melting temperature of the resin material and the frictional heat at the time of kneading. As described above, when the damping component is thermally decomposed, for example, in a molded product obtained from the damping material, there is a problem in that the damping property according to the blending amount of the damping component is difficult to be exhibited. .

  The present invention has been made in view of such conventional circumstances, and the object thereof is to sufficiently exhibit the damping property imparting agent and the damping performance capable of sufficiently exhibiting the damping performance by having heat resistance. It is to provide a damping material.

  In order to achieve the above object, the damping agent according to the first aspect of the present invention is a damping agent that imparts damping property to the resin material by being used in combination with the resin material. In summary, N, N'-di-2-naphthyl-p-phenylenediamine is contained as an active ingredient.

The gist of the invention described in claim 2 is that, in the damping agent according to claim 1, the resin material is at least one of polyamide and polyester.
A third aspect of the present invention is the damping agent according to the first or second aspect, wherein the active ingredient is 1 to 50% by mass relative to the total mass of the resin material and the active ingredient. The gist is to be mixed with the resin material so as to be a ratio.

  The damping material of the invention according to claim 4 is a damping material containing a resin material as a base material and a damping property-imparting component that imparts damping property to the resin material, wherein the damping property component Is N, N'-di-2-naphthyl-p-phenylenediamine.

The gist of the invention described in claim 5 is that in the damping material according to claim 4, the resin material is at least one of polyamide and polyester.
According to a sixth aspect of the present invention, in the damping material according to the fourth or fifth aspect, the damping component is 1 to 50 masses with respect to the total mass of the resin material and the damping component. The gist is to be mixed with the resin material so that the mass ratio is%.

  According to the damping property imparting agent of the present invention, the damping performance can be sufficiently exhibited by having heat resistance. According to the damping material of the present invention, the damping performance is sufficiently exhibited.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail.
The damping property imparting agent is used by mixing with a resin material, and imparts damping property to the resin material. This attenuating agent expresses a function of converting energy (excluding light energy and electrical energy) such as vibration energy, impact energy, and sound energy into heat energy in the resin material. That is, the damping property imparting agent imparts a damping property that attenuates energy propagated from the outside to the resin material.

  This attenuating agent contains N, N′-di-2-naphthyl-p-phenylenediamine as an active ingredient. As this N, N'-di-2-naphthyl-p-phenylenediamine, for example, commercially available Nocrack White (trade name) can be used.

This attenuating agent can contain a filler, a flame retardant, a corrosion inhibitor, a colorant, an antistatic agent, a wetting agent, and the like as necessary in addition to the active ingredient.
The content of the active ingredient in the attenuating agent is not particularly limited, but is preferably 50% by mass or more, more preferably 60% by mass or more, still more preferably 70% by mass or more, and most preferably the total amount as the active ingredient. Attenuating agent. When the content of the active ingredient is 50% by mass or more, the amount of the attenuating agent added to the resin material can be reduced, so that the handling property of the attenuating agent is improved.

  The compounding amount of the attenuating agent with respect to the resin material is a mass ratio of the active ingredient to the total mass of the resin material and the active ingredient, preferably 1 to 50% by mass, more preferably 3 to 55% by mass, and still more preferably 4 to 4%. 40% by mass. When this mass ratio is less than 1 mass%, it is difficult to obtain excellent damping performance. On the other hand, if it exceeds 50% by mass, the moldability may not be sufficiently obtained.

  Resin materials to which this attenuating agent is blended are generally classified into general-purpose plastics and engineering plastics. General-purpose plastics include polyvinyl chloride, polyethylene, polypropylene, polystyrene, polyvinyl acetate, polymethyl methacrylate, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer, ethylene / Methacrylic acid copolymer, ethylene / methacrylic acid ester copolymer, acrylonitrile / styrene copolymer, acrylonitrile / butadiene / styrene resin copolymer, and the like. Examples of the ethylene / acrylic acid ester copolymer include an ethylene / methyl acrylate copolymer and an ethylene / ethyl acrylate copolymer. Examples of the ethylene / methacrylic acid ester copolymer include an ethylene / methyl methacrylate copolymer and an ethylene / ethyl methacrylate copolymer. Examples of the engineering plastic include polyamide, polyester, polyacetal, polyester elastomer, and various liquid crystal polymers. A single kind of resin material may be used, or a plurality of kinds may be blended. Among these resin materials, when an engineering plastic having a melting temperature higher than that of a general-purpose resin is generally employed, the effect of the attenuating agent can be sufficiently obtained. In particular, the effect of the attenuating agent can be remarkably obtained by using the attenuating agent by mixing it with at least one of polyamide and polyester. Examples of the polyamide include polyamide 6, polyamide 66, polyamide 46, polyamide elastomer, and the like. Examples of the polyester include polyethylene terephthalate, polybutylene terephthalate, and polyester elastomer. At least one of these polyamides and polyesters may be used alone or in combination of two or more.

  The attenuating material contains a resin material as a base material and an attenuating component that imparts attenuating property to the resin material. This attenuating component is N, N′-di-2-naphthyl-p-phenylenediamine. As the resin material, the above resin material is used.

This attenuating material may contain a filler, a flame retardant, a corrosion inhibitor, a colorant, an antistatic agent, a wetting agent, and the like as components other than the attenuating component.
The damping performance of this damping material is confirmed by the loss tangent (tan δ) measured by dynamic viscoelasticity. That is, the higher the loss tangent value, the better the damping performance. The value of the loss tangent depends on the temperature, and the loss tangent has a peak value at a predetermined temperature (peak temperature).

  When the resin material is a thermoplastic resin, this attenuating material is obtained by mixing an attenuating agent (attenuating component) with a molten resin material. Further, when the resin material is a thermosetting resin, this attenuating material can be obtained by mixing an attenuating agent (attenuating component) with the resin material before curing. For mixing the resin material and the attenuating agent (attenuating component), a known mixer such as a dissolver, a Banbury mixer, a planetary mixer, a glen mill, or a kneader can be used. When vibration energy propagates to the damping material from the outside, for example, the vibration energy is converted into thermal energy by friction between the molecular chain of the resin material and the N, N′-di-2-naphthyl-p-phenylenediamine molecule. Is assumed to be converted to In this way, the energy is converted in the damping material, so that the damping material exhibits damping properties.

  This attenuating material can be used as a molded product that exhibits attenuating properties, for example, in the fields of automobiles, interior materials, building materials, home appliances, electronic devices, industrial machine parts, and the like. In addition, this attenuating material is a molded article that absorbs impact energy, such as sports equipment such as shoes, gloves, various armor, grips, headgear, medical equipment such as casts, mats, supporters, wall materials, flooring materials, and fences. It can be applied to building materials such as, various cushioning materials, various interior materials and the like.

  When this damping material is used as a damping material, it can be used as an unconstrained damping sheet by forming the damping material into a sheet shape. The unconstrained vibration damping sheet is used in a state where one side surface of the vibration damping sheet is not restrained by being bonded to an application location. When this damping material is used as a damping material, a damping sheet obtained by molding the damping material into a sheet shape is used as a damping layer, and the damping layer is constrained on the surface of the damping layer. A constraining vibration damping sheet can be obtained by bonding a constraining layer for the purpose. Examples of the constraining layer include metal foils such as aluminum and lead, films formed from synthetic resins such as polyethylene and polyester, and nonwoven fabrics. This constrained vibration damping sheet is used in a state where both surfaces of the vibration damping layer are constrained by being bonded to an application location.

The effects exhibited by this embodiment will be described below.
(1) The attenuating agent contains N, N′-di-2-naphthyl-p-phenylenediamine as an active ingredient. This active ingredient sufficiently expresses the function of converting energy such as vibration energy into heat energy in the resin material. Therefore, this damping property imparting agent can impart damping properties to the resin material. For example, when a thermoplastic resin is employed as the resin material, if a resin material in which an attenuation imparting agent is blended is melt-kneaded and then molded, a molded product imparted with attenuation can be obtained. Further, for example, when a thermosetting resin is employed as the resin material, a molded product with a damping property can be obtained by mixing the damping material with the resin material before curing and then curing the resin material. It will be.

  Furthermore, since the effective component of the damping agent is excellent in heat resistance, it is effective when mixing a resin material and a damping agent or molding a resin material containing a damping agent. Thermal decomposition of the components will be suppressed. That is, the attenuation performance according to the blending amount of the attenuation imparting agent is easily exhibited, so that the attenuation performance can be sufficiently exhibited.

  (2) The attenuating agent is preferably mixed with at least one of polyamide and polyester. That is, at least one of polyamide and polyester is likely to be subjected to severe temperature conditions when mixing an attenuating agent or molding a resin material containing an attenuating agent. It is an attenuation imparting agent mixed with such a resin material, and the heat resistance of the effective component is sufficiently exhibited by containing the effective component. For this reason, this attenuating agent can be used more effectively by being mixed with at least one of polyamide and polyester.

  (3) It is preferable that an attenuation imparting agent is mixed with a resin material so that an active ingredient may be a mass ratio of 1 to 50% by mass with respect to a total mass of the resin material and the active ingredient. In this case, excellent damping performance can be obtained while maintaining the moldability of the resulting damping material.

  (4) The damping material contains a resin material as a base material and N, N′-di-2-naphthyl-p-phenylenediamine as a damping imparting component. As a result of sufficiently exhibiting the function of converting energy such as vibration energy into heat energy in the resin material, the damping material imparts damping properties to the damping material.

  Further, since this damping component is excellent in heat resistance, when mixing a resin material and a damping component, or molding a resin material containing a damping agent, the heat of the active component Decomposition will be suppressed. That is, the attenuation performance according to the blending amount of the attenuation imparting agent is easily exhibited, so that the attenuation performance can be sufficiently exhibited.

  (5) The attenuating material is preferably mixed with the resin material so that the attenuating component is 1 to 50% by mass with respect to the total mass of the resin material and the attenuating component. In this case, excellent damping performance can be obtained while maintaining the moldability of the resulting damping material.

In addition, the said embodiment can also be changed and comprised as follows.
-When manufacturing an attenuating material, after manufacturing the masterbatch which mix | blended the attenuating property imparting agent (attenuating property imparting component) with the resin material, you may further dilute the masterbatch with a resin material.

Next, the embodiment will be described more specifically with reference to examples and comparative examples.
Example 1
As shown in Table 1, an attenuating agent comprising only an active ingredient (attenuating component) with respect to 90 parts by mass of polyamide 66 (PA66, Zytel (trade name) 101NC010, manufactured by DuPont) as a resin material. A damping material was prepared by blending 10 parts by mass. Mixing of PA66 and an attenuating agent is performed by melt-kneading PA66 at a heating temperature of 290 ° C. for 20 minutes using an MS pressure type kneader (DS1-3 type, manufactured by Moriyama Seisakusho Co., Ltd.). It was.

(Example 2)
As shown in Table 1, with respect to 90 parts by mass of polybutylene terephthalate (PBT, Crastin (trade name) S600F10NC010 / BK851 / BK851J, manufactured by DuPont Co., Ltd.) as a resin material, only from an active ingredient (attenuating component) An attenuating material was prepared by blending 10 parts by mass of the attenuating agent. Mixing of PBT and attenuating agent is performed by melt-kneading PBT at a heating temperature of 240 ° C. for 20 minutes using an MS pressure type kneader (DS1-3 type, manufactured by Moriyama Seisakusho Co., Ltd.). It was.

(Comparative Examples 1 and 2)
The polyamide 66 which does not mix | blend an attenuating property agent was made into the comparative example 1 with respect to Example 1. FIG. Similarly, PBT not containing an attenuating agent was used as Comparative Example 2 relative to Example 2.

<Measurement of dynamic viscoelasticity>
The damping material obtained in each example was molded into a sheet shape to obtain a sheet material having a thickness of 1 mm. Each sheet material was cut into a size of 35 mm × 5 mm to obtain a test piece for dynamic viscoelasticity measurement. Loss tangent (tan δ) was measured when the temperature of each test piece was continuously increased using a dynamic viscoelasticity measuring apparatus (RSA-II: manufactured by Rheometric Co., Ltd.) while vibrating. The measurement conditions were an excitation frequency of 10 Hz, a measurement temperature range of −20 ° C. to + 160 ° C., and a temperature increase rate of 5 ° C./min. The results obtained by this measurement are shown in FIGS. 1 and 2, and the peak value and peak temperature of the loss tangent are also shown in Table 1. Moreover, the improvement rate of the loss tangent in each example was calculated on the basis of each comparative example. The results of these improvement rates are also shown in Table 1.

各実施例では、樹脂材料の溶融混練時において、減衰性付与成分の熱分解による異臭や白煙が発生することなく、樹脂材料に減衰性付与剤を混合することができた。さらに、各実施例における損失正接のピーク値は、各比較例における損失正接のピーク値よりも、表１に示す向上率で高まっていることから、各実施例では減衰性が付与されていることがわかる。

In each of the examples, the attenuating agent could be mixed with the resin material without generating a strange odor or white smoke due to thermal decomposition of the attenuating component during melt kneading of the resin material. Further, the loss tangent peak value in each example is higher than the loss tangent peak value in each comparative example at the improvement rate shown in Table 1, and therefore, each example is provided with attenuation. I understand.

3 is a graph showing the relationship between temperature and loss tangent in Example 1 and Comparative Example 1. The graph which shows the relationship between the temperature in Example 2 and Comparative Example 2 and a loss tangent.

Claims (6)

Attenuating agent that imparts attenuating property to the resin material by being mixed with the resin material,
An attenuating agent comprising N, N'-di-2-naphthyl-p-phenylenediamine as an active ingredient. The attenuating agent according to claim 1, wherein the resin material is at least one of polyamide and polyester. The damping property of Claim 1 or Claim 2 mixed with the said resin material so that the said active ingredient may be a mass ratio of 1-50 mass% with respect to the total mass of the said resin material and the said active ingredient. Giving agent. A damping material containing a resin material as a base material and a damping property-imparting component that imparts damping properties to the resin material,
The attenuating material is N, N'-di-2-naphthyl-p-phenylenediamine. The damping material according to claim 4, wherein the resin material is at least one of polyamide and polyester. Claim 4 or Claim 5 mixed with the resin material so that the damping property-imparting component has a mass ratio of 1 to 50 mass% with respect to the total mass of the resin material and the damping property-imparting component. Attenuating material as described.

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