JPH01156151A - Composition for preventing abnormal sound and method for preventing abnormal sound by said composition - Google Patents

Abstract

PURPOSE:To facilitate the application of the above-captioned composition to parts while preventing effectively abnormal sounds by forming said composition of photosetting resin binder and granular filler to set the hardened film hardness to a specific value. CONSTITUTION:A composition for preventing abnormal sounds is interposed in the contact portion of a base body of a vehicle or the like with parts mounted on the base body to prevent the abnormal sounds produced from the contact portion. Then, the composition is composed of 100-60wt.% of photosetting resin binder and 0-40wt.% of granular filler and shall have 100 or less of Shore hardness 'A' of hardened film. The granular filler shall consist of spherical elastic resin grains having 70mum or less of diameter and specified values of at least 100kg/cm<2> of tensile strength, at least 300% of elongation percentage and 1/3 or less of said tensile strength in 100% of elongation percentage.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a composition for preventing abnormal noise generated from a contact portion between a base body such as a vehicle, particularly an automobile body, and parts attached to the body. , and a method for preventing abnormal noise using the composition.

[Conventional technology and its problems]

Dashboards and many other plastic molded parts are attached to automobiles, but these parts are not necessarily attached closely to the car body, and in many cases, the car body and the attached parts are connected to each other. It is normal for there to be a small gap between the two. For this reason, there is a problem in that abnormal noises are generated from the gaps between the contact portions of these parts and the vehicle body due to vibrations while the vehicle is running, giving the driver a sense of discomfort or anxiety.

A conventional method to improve the above problem is to attach a tape or ribbon-like felt (hereinafter referred to as tape-like felt) with an adhesive layer to the part that contacts the vehicle body. By attaching the parts obtained in this way to the car body, it is devised to prevent direct contact between the parts and the car body.

The conventional method described above has the advantage of being a simple method of simply pasting a felt tape, and can effectively prevent the generation of abnormal noise. In addition to the problem that many steps are required to make the tape-shaped felt, it is necessary to rely on human labor to attach the tape-like felt to the parts, which is a major negative factor in terms of cost. That is, the tape-shaped felt is produced by applying an adhesive and drying it, pasting it onto an appropriate release paper treated with a release agent,
A step such as cutting the felt on the release paper thus obtained into a tape or ribbon shape is required.

The present invention was made with the aim of improving the problems in the conventional methods for preventing abnormal noises, and it is possible to use a composition having specific film characteristics that is extremely easy to apply to parts and has an effective noise preventing effect. The present invention was completed based on the discovery that the present invention is also excellent.

(Means for Solving the Problem) That is, the present invention provides a composition that is interposed in the contact portion between a base body such as a vehicle and a component attached to the base body in order to prevent abnormal noise generated from the contact portion. For noise prevention, the composition contains 100 to 60% by weight of a photocurable resin binder and 0 to 40% by weight of a particulate filler, and has a hardness of the film after curing of Shore "A" hardness of 100 or less. The first invention relates to a composition, in which when an arbitrary part is attached to a base such as a vehicle, the above-mentioned noise-preventing composition is applied to at least one of the contact surfaces between the base and the part and cured. A second invention is a method for preventing abnormal noises comprising:

When the noise prevention composition of the present invention is applied to parts, etc.,
In order to cure the composition in a short time, it is necessary that it is photocurable, and in order to ensure the prevention of abnormal noise, the film hardness of the final composition should be at least 100% Shore'''.
A: It is necessary to have a hardness of 100 or less, preferably 80 to 30. As the film hardness exceeds 100 and becomes harder, the noise prevention effect tends to be poor, and the hardness is less than 30.
(softer), although it has an excellent noise prevention effect,
The cured film may become sticky and difficult to handle.

Examples of the photocurable resin binder that can be used to obtain such a composition include polyester acrylate, epoxy acrylate, polyurethane acrylate, polyether acrylate, polyol acrylate, polybutadiene acrylate, and prepolymers of these. Various prepolymers that belong to the same class and are available on the market (for example, Art Resin UN- manufactured by Itagami Kogyo Co., Ltd.)
2500 and UN-6060, Kayarad CL-50 manufactured by Nippon Kayaku Co., Ltd., Aronix M manufactured by Toagosei Chemical Industry Co., Ltd.
2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, tetrahydroxyfurfuryl (meth)acrylate, glycidyl (meth)acrylate neobentyl glycol di(meth)acrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, 1,3-butylene diacrylate, 1,4-butanediol di(meth)acrylate, l,6-hexanethiol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, Pentaerythritol tri(meth)acrylate, pentaerythritol tetra(
Monomers such as meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and these prepolymers and monomers. These can be used alone or in combination of two or more, appropriately selected so that the final film hardness is within the above range.゛Particulate fillers that can be used in combination with the photocurable resin binder include inorganic fillers such as calcium carbonate, silicon dioxide, talc, and clay; polyurethane;
Organic fillers made of resins such as polyester, polyethylene, polypropylene, polyamide, polyacrylate, polyvinyl chloride, polyvinyl acetate, etc. Among these fillers, spherical resin particles, especially particle size 70
It is preferable to use spherical elastic resin particles with a particle size of It m or less because an excellent noise prevention effect can be obtained, and in particular, the elastic properties are such that the tensile strength is 100 kg/crt?
As mentioned above, it is more preferable that the elongation rate is 300% or more, and the strength at the elongation rate of 100% (referred to as 100% stress strength) has a characteristic value of 1/3 or less of the tensile strength.

The elastic properties of the above-mentioned spherical elastic resin particles mean that the resin particles are made into an organic solvent solution with an appropriate organic solvent, and then the solution is placed on a support such as a glass plate to a dry film thickness of about 200 μm.
Flow-coat the film so that it becomes 100 m, and dry it by increasing the temperature while being careful not to create bubbles in the film (e.g., 30 minutes at 40°C →
60° C. for 30 minutes → 80° C. for 30 minutes), the film thus obtained was peeled off from the support, and a test piece was prepared by cutting into 10 mmg, and the value was measured using the following test method.

(a) Tensile strength: using a Tensilon tensile tester,
A tensile test was conducted at 20°C and a tensile speed of 500 mm/min, and the film strength at the time of rupture was measured in kg/ct.
Represented by /.

(b) Elongation rate 2 The elongation rate of the film when the test piece breaks in the above tensile test (a) is expressed in %.

(c) 100% stress strength: The tensile strength of the test piece when the elongation rate of the test piece reaches 100% in the tensile test
g/c n? Expressed as

In the noise prevention composition of the present invention, as long as the hardness of the film after curing is 100 or less on the Shore IIA hardness, it is possible to obtain a composition with excellent noise prevention properties without adding particulate filler. Since a soft cured film having a Shore" All hardness of 100 or less, particularly 30 or less, may develop tackiness, a particulate filler is blended to improve this problem. The amount of the photocurable resin binder is 1
00-60% by weight and particulate filler 0-40% by weight,
Preferably, the photocurable resin binder is in the range of 99 to 60% by weight and the particulate filler is in the range of 1 to 40% by weight, particularly preferably the photocurable resin binder is in the range of 99 to 70% by weight and the particulate filler is in the range of 1 to 30% by weight. be. In the above blending amount of the composition of the present invention, the blending amount of the particulate filler is 4
If the amount exceeds 0, the viscosity of the resulting composition increases, coating workability deteriorates, it becomes difficult to form a cured film with a smooth surface, and the strength of the cured film decreases. There is a drawback.

The noise-preventing composition described above can be produced by a method commonly used in the paint industry. For example, it can be manufactured by adding a predetermined amount of particulate filler to a photocurable resin binder and mixing and dispersing it by a method such as stirring. At this time, if the photocurable resin binder is solid or highly viscous, the viscosity may be adjusted using an organic solvent or the like.

In addition to the photocurable resin binder and particulate filler, the noise prevention composition may contain various additives as necessary, such as pigments, dyes, antisettling agents, antifoaming agents, and fluidity adjusters. A leveling agent, a photopolymerization initiator, an organic solvent, etc. can be added within a range that does not impair the above-mentioned film properties.

The noise-preventing composition of the present invention obtained as described above forms a film having the above-mentioned specific hardness, so that it can be installed on a substrate such as an automobile so that the parts do not come into direct contact and there is no gap. It can be installed in such a way that it is possible to reliably prevent the occurrence of abnormal noise.

Further, in the method for preventing abnormal noises, which is the second invention of the present invention, the composition for preventing abnormal noises obtained as described above is diluted with an appropriate organic solvent if necessary so as to have an appropriate coating viscosity. death,
Using various applicators or methods known in the paint industry, such as spray, brush, roll, dip, dispenser, etc.
For attachment to a base body such as a vehicle, abnormal noise can be prevented by applying the composition to at least one of the contact parts of the parts and irradiating the composition with ultraviolet rays to cure the composition.

〔Example〕

Hereinafter, the present invention will be specifically explained based on Examples. In addition, the blending amount of each component in the examples is shown on a weight basis unless otherwise specified.

Examples 1 to 3 and Comparative Example 1 Each component was stirred and mixed according to the composition shown in Table 1 below to prepare a composition for preventing abnormal noise that does not contain particulate filler.

The obtained composition was evaluated by the following evaluation method, and the results are also shown in Table 1 below.

(a) Shore hardness: JIS K 6301,5
．． 2 Test according to the method of spring type hardness test U (Type A).

(b) Abnormal noise prevention property: ABS resin plate (rg, size 3X55X
150 mm) was prepared, the above composition was applied to the surface of one ABS resin plate so that the film thickness was about 1 mm, and the applied film was irradiated with ultraviolet rays with an energy amount of 1300 mj/cm. harden. Layer the other ABS resin plate on top of this cured film, and after fixing both ends of both resin plates with bolts, manually hold both resin plates so that the depth of the valley and the height of the peak are approximately 10 mm. Repeatedly bend it up and down with
Evaluate based on the following evaluation criteria.

◎: Absolutely no abnormal noise, very good O: Hardly any abnormal noise is felt, good △: Slight abnormal noise is felt, but it is not a practical problem ×: Abnormal noise is generated, Impossible for practical use (c) Workability (leveling property): Coat on an ABs resin plate in the same manner as in (b) above, observe the surface condition of the film after curing with the naked eye, and evaluate using the following evaluation criteria. .

○: Excellent smoothness, good workability Δ: Slightly poor smoothness, but workability is not a problem in practice Tackiness (surface adhesion): After completing the evaluation in (c) above, press the surface of the film with your finger and evaluate the degree of adhesion using the following evaluation criteria: ○: No tackiness at all or very little tackiness. Therefore, there are no practical problems and it is in good condition.

Δ: Adhesiveness is felt, but it is not a practical problem. "Explanation of the ingredients in the table that cannot be measured by hardness (same in the following examples) PETA; Pentaerythritol triacrylate TMPTA;) Rimethylolpropane triacrylate THFA; Tetrahydrofurfuryl acrylate UN-2500: Manufactured by Itagami Kogyo Co., Ltd. , Art Resin UN
-2500 (urethane acrylate prepolymer) CL-50; manufactured by Nippon Kaisha, Kayarad CV-42
20; Manufactured by Dainippon Ink and Chemicals Co., Ltd., Uniday V
-4220 (urethane acrylate prepolymer) Photoinitiator: manufactured by Ciba Geigy, Irgacure #651 (photopolymerization initiator) Examples 4 to 14 and Comparative Examples 2 to 3 Each of the formulations shown in Table 2 below was used. The components were stirred and mixed in the same manner as in the above example to produce a noise prevention composition containing a particulate filler.

Each of the obtained compositions was evaluated using the same evaluation method as in the above examples, and the results are also shown in Table 2.

(The following is a blank space) [Effects of the Invention] Since the noise prevention composition of the present invention has the above-mentioned specific film hardness, when this composition is attached to various plastic molded parts on a base such as a vehicle, By applying the coating to at least one of the contact areas between the base and the molded part and curing it, the molded part can be attached to the base in close contact with the base without any gaps. This has the excellent effect of completely preventing abnormal noises caused by.

Furthermore, although the noise prevention method of the present invention is an extremely simple method that only involves applying the above-mentioned composition having excellent noise prevention properties to at least one of the base body of a vehicle or various plastic molded parts. First, it is an extremely excellent method that can completely prevent the occurrence of abnormal noises.

Claims (5)

[Claims] (1) A composition interposed in a contact area between a base body such as a vehicle and a component attached to the base body in order to prevent abnormal noise generated from the contact area, the composition being a photocurable resin binder. 100-60% by weight and 0-60% particulate filler
40% by weight, and the film hardness after curing is Shore”
A” A composition for preventing abnormal noises having a hardness of 100 or less. (2) The composition has a photocurable resin binder of 99 to 60
% by weight and the particulate filler content ranges from 1 to 40% by weight. (3) The composition for preventing abnormal noise according to Claims 1 and 2, wherein the particulate filler is a spherical elastic resin particle having a particle diameter of 70 μm or less. (4) The spherical elastic resin particles have a tensile strength of 100 kg/
cm^2 or more, an elongation rate of 300% or more, and a strength at 100% elongation rate of 1/3 or less of the tensile strength. Composition for preventing abnormal noise. (5) When attaching any part to a base such as a vehicle, apply 100 to 60% by weight of a photocurable resin binder and 0 to 4% filler on at least one of the contact surfaces between the base and the part.
1. A method for preventing abnormal noise, which comprises applying and curing a composition containing 0% by weight and having a hardness of a Shore "A" hardness of 100 or less after curing.