JP2006342215A - Dampingness-imparting agent and damping material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dampingness-imparting agent and a damping material capable of easily exhibiting damping performance. <P>SOLUTION: The dampingness-imparting agent comprises as active ingredient at least one compound selected from p,p'-dioctyldiphenylamine, triphenyl phosphate and 2,2'-dihydroxy-4-methoxybenzophenone. This agent is to be used by blending with a resin material. This agent expresses the function of converting such energy as vibration energy, shock energy or sound energy to thermal energy in such a resin material. The damping material contains the active ingredient of the agent as dampingness-imparting ingredient. <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 type of damping component is used in combination with a resin material, and is a component that imparts damping performance, that is, damping property, for example, by converting vibration energy into thermal energy for the resin material. is there.
International Publication No. 97/42844 Pamphlet

  The conventional damping property-imparting component tends to be thermally decomposed depending on the mixing conditions in mixing with the resin material and the molding conditions in the molding process of the resin material. Therefore, for example, if the emphasis is placed on the mixing of the attenuating component and the resin material, the thermal decomposition of the attenuating component is promoted. Further, for example, when emphasizing the stability of the damping component with respect to heat during mixing with the resin material, the mixing of the damping component with the resin material tends to be insufficient. Thus, depending on the mixing conditions and the molding conditions, it is difficult to exhibit the damping performance.

  The present invention has been made in view of such conventional circumstances, and an object thereof is to provide an attenuating agent and an attenuating material capable of easily exhibiting the attenuating performance.

  In order to achieve the above object, the damping agent according to the first aspect of the present invention is a damping agent that is used by being mixed with a resin material and imparts damping property to the resin material, and p , P′-dioctyldiphenylamine, triphenyl phosphate, and 2,2′-dihydroxy-4-methoxybenzophenone as an active ingredient.

  According to a second aspect of the present invention, in the damping agent according to the first aspect, the active ingredient is in a mass ratio of 5 to 15% by mass with respect to the total mass of the resin material and the active ingredient. Further, it is summarized as being blended with the resin material.

The gist of the invention described in claim 3 is that, in the damping agent according to claim 1 or 2, the resin material is polyamide.
The damping material of the invention according to claim 4 is a damping material containing a resin material and a damping component that imparts damping properties to the resin material, wherein the damping component is p, The gist is that it is at least one selected from p'-dioctyldiphenylamine, triphenyl phosphate, and 2,2'-dihydroxy-4-methoxybenzophenone.

  According to a fifth aspect of the present invention, in the damping material according to the fourth aspect, the damping component is contained in an amount of 5 to 15% by mass with respect to the total mass of the resin material and the damping component. This is the gist.

  The gist of the invention described in claim 6 is that, in the attenuating material according to claim 4 or 5, the resin material is polyamide.

  According to the present invention, the damping performance can be easily exhibited.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail.
The damping property imparting agent is used by being mixed 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, this damping property imparting agent imparts a damping property that attenuates energy such as vibration energy, impact energy, and sound energy that propagates from the outside to the resin material.

  The attenuating agent contains at least one selected from p, p'-dioctyldiphenylamine, triphenyl phosphate, and 2,2'-dihydroxy-4-methoxybenzophenone as an active ingredient.

  As p, p'-dioctyldiphenylamine, which is an active ingredient of this attenuating agent, NOCRACK (trade name) AD-F (manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.), which is a commercially available additive for resin, Can be used. As triphenyl phosphate which is an active ingredient of this attenuating agent, TPP (manufactured by Daihachi Chemical Co., Ltd.), which is a commercially available additive for resin, can be used. As 2,2'-dihydroxy-4-methoxybenzophenone, which is an active ingredient of this attenuating agent, Chemisorb (trade name) 111 (made by Chemipro Kasei Co., Ltd.), which is a commercially available additive for resin, etc. 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 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 5 to 15 mass%, more preferably 7 to 13 mass%, and still more preferably 8 to 12% by mass. When the mass ratio is 5 to 15 mass%, the damping performance can be exhibited while maintaining the appearance of the damping material well. Further, when the mass ratio is less than 5 mass%, it is difficult to provide excellent damping performance. On the other hand, even if it exceeds 15% by mass, further attenuation performance is hardly exhibited.

Examples of the resin material include thermoplastic resins and thermosetting resins, and these resins 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 engineering plastics include polyamide, polyester, polyacetal, and various liquid crystal polymers. 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. Examples of the polyacetal (polyoxymethylene) include homopolymers and copolymers of oxymethylene and oxyethylene.

  The resin material to which the attenuating agent of the present embodiment is applied is not particularly limited, and a single resin material may be used, or a plurality of resin materials may be blended and used. When the damping property imparting agent of the present embodiment is used by being mixed with a resin material having a high melting temperature, that is, an engineering plastic, its effect can be remarkably obtained. In other words, the active ingredient has excellent heat resistance in addition to the effect of imparting attenuating properties, so even when blended with engineering plastics molded under such high temperature conditions, the thermal decomposition of the active ingredient is suppressed. Will be.

  Here, polyamide, which is a kind of engineering plastic, is a resin material that has a high melting temperature and hardly exhibits damping performance near room temperature. By applying the damping property-imparting agent of this embodiment to such a polyamide, the damping performance near the room temperature (for example, around 23 ° C.) of the polyamide is improved. The damping property-imparting agent of this embodiment is excellent in the effect of improving the damping performance of polyamide 6 near room temperature. In the case where a damping agent having p, p′-dioctyldiphenylamine as an active ingredient is applied to the polyamide 6, the blending amount of the damping agent is such that polyamide 6 and p, p′-dioctyldiphenylamine are mixed. The mass ratio of p, p′-dioctyldiphenylamine to the total mass, preferably 7 to 13 mass%. In addition, when a damping agent having triphenyl phosphate as an active ingredient is applied to polyamide 6, the blending amount of the damping agent is that of triphenyl phosphate relative to the total mass of polyamide 6 and triphenyl phosphate. The mass ratio is preferably 5 to 15 mass%. Furthermore, when an attenuation imparting agent having 2,2′-dihydroxy-4-methoxybenzophenone as an active ingredient is applied to polyamide 6, the compounding amount of this attenuation imparting agent is polyamide 6 and 2,2 The mass ratio of 2,2'-dihydroxy-4-methoxybenzophenone to the total mass with '-dihydroxy-4-methoxybenzophenone is preferably 5 to 15 mass%. Even in general-purpose plastics, if it is difficult to impart damping performance due to the melting temperature or frictional heat at the time of kneading, the damping imparting agent of this embodiment should be applied to such general-purpose plastics. Is valid. For mixing the resin material and the attenuating agent, a known mixer such as a dissolver, Banbury mixer, planetary mixer, Glen mill, kneader or the like can be used.

  The attenuating material of the present embodiment contains a resin material and an attenuating component. The resin material in this attenuating material is a resin material mixed with the attenuating agent. The attenuating component is at least one selected from p, p'-dioctyldiphenylamine, triphenyl phosphate, and 2,2'-dihydroxy-4-methoxybenzophenone described as the active ingredient. The content of the attenuating component in the attenuating material is the mass ratio of the attenuating component to the total mass of the resin material and the attenuating component, preferably 5 to 15% by mass, more preferably 7 to 13%. It is 8 mass%, More preferably, it is 8-12 mass%. This attenuating material is obtained by mixing a resin material and an attenuating component. In addition, this attenuating material can 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 material can be applied to, for example, automobile parts, interior materials, building materials, home appliances, electronic equipment parts, industrial machine parts, and the like as damping materials that absorb vibration energy. 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 bonding the vibration damping layer side to an application location.

  This attenuating material is an impact absorbing material that absorbs impact energy, for example, sports equipment such as shoes, gloves, various armor, grips, headgear, medical equipment such as casts, mats, supporters, wall materials, floor materials, fences, etc. It can be applied to building materials, various cushioning materials, various interior materials and the like. Moreover, when using this attenuating material as an impact-absorbing material, it can be utilized as an impact-absorbing sheet by forming the attenuating material into a sheet shape. This shock absorbing sheet is used by being bonded to an application location.

Next, the operation of the attenuating agent and the attenuating material configured as described above will be described.
The attenuating agent used by mixing with a resin material contains at least one selected from p, p'-dioctyldiphenylamine, triphenyl phosphate, and 2,2'-dihydroxy-4-methoxybenzophenone as an active ingredient. is doing. When mixing such an active ingredient (attenuating property imparting ingredient) and the resin material, the active ingredient is heated by heat accompanying melting of the resin material. In the attenuating agent of this embodiment, thermal decomposition of the active ingredient due to such heating is suppressed. Therefore, the active ingredient and the resin material can be sufficiently mixed. As a result, an attenuating material with good dispersibility of the active ingredient can be obtained. Furthermore, since the thermal decomposition of the active ingredient is suppressed when mixing the active ingredient and the resin material, the generation of odor due to the thermal decomposition can be suppressed.

  It is estimated that the obtained attenuating material can convert vibration energy or the like into thermal energy by friction between the molecular chain of the resin material and the molecule of the active ingredient. In this damping material, the active ingredient is sufficiently dispersed, and the thermal decomposition of the active ingredient is suppressed even when the damping material is molded, so that the function of converting such energy is fully exhibited. Become.

The effects exhibited by this embodiment will be described below.
(1) The attenuation-imparting agent of this embodiment contains at least one selected from p, p'-dioctyldiphenylamine, triphenyl phosphate, and 2,2'-dihydroxy-4-methoxybenzophenone as an active ingredient. Yes. Therefore, the active ingredient can be sufficiently dispersed in the resin material by suppressing the thermal decomposition of the active ingredient during mixing with the resin material. As a result, the attenuation performance can be easily exhibited. Furthermore, when mixing the attenuating agent and the resin material, it is possible to suppress odor caused by thermal decomposition of the active ingredient.

  (2) The attenuating agent is preferably mixed with the resin material such that the active ingredient is in a mass ratio of 5 to 15% by mass with respect to the total mass of the resin material and the active ingredient. In this case, the damping performance can be exhibited while maintaining the appearance and mechanical properties of the resulting damping material, and thus the molded product obtained by molding the damping material.

(3) The damping property-imparting agent can improve the damping performance in the vicinity of room temperature of polyamide by being used in combination with polyamide.
(4) The attenuating material of this embodiment is at least selected from a resin material and p, p'-dioctyldiphenylamine, triphenyl phosphate, and 2,2'-dihydroxy-4-methoxybenzophenone as an attenuating component. Contains one kind. According to this configuration, it is possible to prevent the damping component from being thermally decomposed along with the molding of the damping material, so that the damping performance can be easily exhibited. Furthermore, the odor resulting from the thermal decomposition of the attenuation imparting component can be suppressed during molding of the attenuation material.

  (5) By containing 5 to 15% by mass of the attenuating component with respect to the total mass of the resin material and the attenuating component, the same effect as that described in the above (2) can be obtained. .

  (6) By adopting polyamide as the resin material, the same effects as those described in (3) above can be obtained.

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 p, p′-dioctyldiphenylamine (component A, Nocrack (trade name) AD-F, manufactured by Ouchi Shinsei Chemical Co., Ltd.) and polyamide as a resin material 6 (PA6, Zytel (trade name) 21A NC010, manufactured by DuPont) was mixed to prepare a damping material. The damping property-imparting agent and the resin material were mixed by melting and kneading the resin material using a kneader (MS pressure type kneader, manufactured by Moriyama Seisakusho) at a heating temperature of 220 ° C. for 15 minutes. Table 1 shows the blending amounts (mass%) of the attenuating agent and the resin material.

(Comparative Example 1)
As shown in Table 1, Comparative Example 1 is a resin material that does not contain an attenuating agent.
(Examples 2 to 4)
As shown in Table 1, Examples 2 to 4 were the same as Example 1 except that an attenuating agent comprising triphenyl phosphate (component B, TPP, manufactured by Daihachi Chemical Co., Ltd.) was used. A damping material was prepared. Table 1 shows the blending amounts (mass%) of the attenuating agent and the resin material.

(Example 5)
As shown in Table 1, Example 5 uses an attenuating agent comprising 2,2′-dihydroxy-4-methoxybenzophenone (component C, Chemisorb (trade name) 111, manufactured by Chemipro Kasei Co., Ltd.). A damping material was prepared in the same manner as in Example 1 except that. Table 1 shows the blending amounts (mass%) of the attenuating agent and the resin material.

<Measurement of dynamic viscoelasticity>
A sheet material having a thickness of 1 mm was obtained by molding the damping material obtained in each Example and the resin material of Comparative Example 1 into a sheet shape. 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 loss tangent at 23 ° C. for each example is also shown in Table 1. 1 is a graph showing the relationship between temperature and loss tangent in Example 1 and Comparative Example 1, and FIG. 2 is a graph showing the relationship between temperature and loss tangent in Examples 2 to 4 and Comparative Example 1. Further, FIG. 3 is a graph showing the relationship between temperature and loss tangent in Example 5 and Comparative Example 1.

表１に示す結果から明らかなように、各実施例の損失正接の値（２３℃）は、比較例１の損失正接の値（２３℃）よりも高い値を示していることから、各実施例では、減衰性が付与されていることがわかる。また、各実施例では減衰性付与剤と樹脂材料とを混合する際、及び減衰性材料をシート状に成形する際における臭気はほとんど感じられなかった。このことから、有効成分（減衰性付与成分）の熱分解が抑制されていることがわかる。すなわち、各実施例では樹脂材料中に有効成分（減衰性付与成分）を十分に分散させることが可能となるため、減衰性能を容易に発揮させることができることがわかる。さらに、図１〜図３に示す結果から、上記の減衰性付与剤は、ＰＡ６が有する損失正接のピークを低温側にシフトさせる作用を奏することがわかる。各実施例の減衰性材料では、そうした減衰性付与剤の作用によって室温付近における損失正接が高まる結果、各実施例の減衰性材料は室温付近（２３℃付近）における減衰性が付与されることがわかる。加えて、各実施例の試験片には、割れや白化が確認されなかったため、各実施例の減衰性材料の成形性やその減衰性材料から得られる成形体の外観も良好であることが認められる。

As is apparent from the results shown in Table 1, the loss tangent value (23 ° C.) of each example is higher than the loss tangent value (23 ° C.) of Comparative Example 1, and thus each example. In the example, it can be seen that attenuation is imparted. Moreover, in each Example, the odor at the time of mixing an attenuation | damping property imparting agent and a resin material and shape | molding an attenuation material in a sheet form was hardly felt. From this, it can be seen that the thermal decomposition of the active component (attenuating component) is suppressed. That is, in each Example, since it becomes possible to fully disperse | distribute an active ingredient (damping property provision component) in a resin material, it turns out that damping performance can be exhibited easily. Furthermore, it can be seen from the results shown in FIGS. 1 to 3 that the above-described attenuation imparting agent has an effect of shifting the loss tangent peak of PA 6 to the low temperature side. In the attenuating material of each example, the loss tangent near room temperature is increased by the action of the attenuating agent. As a result, the attenuating material of each example is imparted with attenuating property near room temperature (around 23 ° C.). Recognize. In addition, since no cracking or whitening was confirmed in the test piece of each example, it was recognized that the moldability of the damping material of each example and the appearance of the molded body obtained from the damping material were also good. It is done.

The graph which shows the relationship between the temperature in the dynamic viscoelasticity measurement of Example 1 and Comparative Example 1, and a loss tangent. The graph which shows the relationship between the temperature in the dynamic viscoelasticity measurement of Examples 2-4 and the comparative example 1, and a loss tangent. The graph which shows the relationship between the temperature and the loss tangent in the dynamic viscoelasticity measurement of Example 5 and Comparative Example 1.

Claims (6)

An attenuating agent used in admixture with a resin material and imparting attenuating property to the resin material, comprising p, p'-dioctyldiphenylamine, triphenylphosphate, and 2,2'-dihydroxy-4-methoxy An attenuating agent comprising at least one selected from benzophenone as an active ingredient. The attenuating agent of Claim 1 mix | blended with the said resin material so that the said active ingredient may become a mass ratio of 5-15 mass% with respect to the total mass of the said resin material and the said active ingredient. The damping agent according to claim 1 or 2, wherein the resin material is polyamide. A damping material containing a resin material and a damping component that imparts damping properties to the resin material, wherein the damping component is p, p′-dioctyldiphenylamine, triphenyl phosphate, and 2, A damping material, which is at least one selected from 2'-dihydroxy-4-methoxybenzophenone. The attenuating material according to claim 4, wherein the attenuating component is contained in an amount of 5 to 15% by mass with respect to the total mass of the resin material and the attenuating component. The damping material according to claim 4 or 5, wherein the resin material is polyamide.

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