JPH0827409A - Surface-treating agent for preventing squeaking sound - Google Patents

Abstract

PURPOSE:To obtain a surface-treating agent for inhibiting squeak sounds generated by the interiors rubbing against each other due to the body vibrations when a car is running, by admixing a certain amount of rubber fine particles of a spherical or lump shape having specific particle sizes to an acrylic-vinyl chloride resin for coating. CONSTITUTION:An acrylic-vinyl chloride copolymer resin for coating is mixed with rubber fine particles of a spherical or lump shape having 1-50mum average particle size (such as NBR fine particles) in an amount of 1-60wt.% as a solid basis, then a surfactant such a nonionic toluene surfactant is added in an amount of 1wt.% based on the rubber fine particles, then they are mixed, kneading- dispersed using a 3-roller system or the like and diluted with a diluent to have a concentration of 50%. Thus, the treating agent is applied to car interiors such as instrument panel, pillar garnish, door trim and the like to inhibit squeak sounds generated by these interiors rubbing against each other due to the body vibration when the car is running.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeaking noise-preventing surface treatment agent used for automobile interior parts such as instrument panels, pillar garnishes and door trims. The present invention relates to a squeaking noise preventing surface treatment agent for preventing squeaking noises generated by rubbing against each other.

[0002]

2. Description of the Related Art Conventionally, the surfaces of instrument panels, pillar garnishes, door trims, etc., which are interior parts of automobiles, are covered with a vinyl chloride (PVC) sheet, and the surface layer thereof is provided with weather resistance and low gloss. For this purpose, the surface treatment is performed with an acrylic-vinyl chloride paint or urethane paint having a thickness of 10 to 30 μm.

At the portions where the surfaces of the interior parts of the automobile come into contact with each other, squeaking noises are generated by rubbing against each other due to the vibration during traveling of the automobile. Conventionally, a method of sticking a non-woven fabric to the contact part on the surface of the interior parts for the squeaking sound has been generally used, and the non-woven fabric is interposed between both parts to suppress the generation of sound. .

[0004]

However, in the conventional method of pasting a non-woven fabric on the contact portion of the surface of the interior parts, it is difficult to mechanize because it is a fine work, and it becomes a method relying on human labor, so that the number of work steps is large and the cost is high. It had the drawback of becoming expensive. Also, at the contact area between the door trim and the edge of the instrument panel or the seat side, it is not visible when the door is closed, so there is no problem in terms of appearance. There was a drawback that the quality of the appearance was poor when it was pasted.

On the other hand, JP-A-3-143745, JP-A-3-143746 and JP-A-3-21742.
Japanese Patent Publication No. 5 discloses a technique of applying a squeaking noise preventive agent such as an elastic coating film or an abnormal noise preventing paint to a portion where a sound is generated in a contact portion on the surface of an automobile interior part. However, these methods are methods in which after the parts are molded, the inhibitor is applied to the contact parts on the surface of the interior parts as a post-treatment. Therefore, there is a drawback that a new application step is required although automation is possible. It was Further, since these methods are intended to prevent only the squeaking noise, they have a drawback in that they cannot be applied to a noticeable portion in terms of appearance quality.

Further, JP-A-5-156206 discloses a coating agent containing urethane fine particles in a urethane resin. However, this coating agent has a drawback that the cost is higher than that of the acrylic paint, and that the coating material is inferior to the acrylic paint in terms of a single sound generated when a contacting component slides out.

Therefore, the present invention has been made by paying attention to such a conventional problem, and prevents the squeaking noise generated at the contact portion on the surface of the interior parts of the automobile, and at the same time, the interior parts that have been conventionally used. It is an object of the present invention to provide a squeaking noise preventing surface treatment agent that enables simplification of the process (omission of the non-woven fabric attaching process) as compared with the method of attaching the non-woven fabric to the contact portion of the surface.

[0008]

Means and Action for Solving the Problems The present inventors have
As a result of earnest research to solve the above problems, in the case of acryl-vinyl chloride coating resin containing a predetermined amount of predetermined rubber-based fine particles, the interior parts rub against each other due to vibration during running of the automobile. The inventors have found that the squeaking noise that occurs can be effectively prevented, and have reached the present invention.

The above-mentioned object of the present invention is to provide acrylic-vinyl chloride resin for coating material with spherical or lumpy rubber fine particles having an average particle diameter in the range of 1 to 50 μm as a solid content of 1 to 6.
It was achieved by an anti-squealing surface treatment agent characterized by containing 0% by weight. Hereinafter, the present invention will be described in more detail.

First, the concept of reducing the squeaking noise of automobile interior parts according to the present invention will be described below. The sounds generated in the interior of an automobile are roughly classified into two types. One is a single sound that is generated when a part starts to slide, and the other is a continuous sound that is generated by a steady vibration while the vehicle is running. The former single sound is generated when the interior parts are shocked when starting or when climbing over a step, and the latter continuous sound can occur continuously and frequently while the vehicle is running depending on the road surface condition. It is a thing.

The present invention has been made in view of the frequency of occurrence and the degree of discomfort felt by an occupant, and the object thereof is to reduce the continuous sound generated by the latter steady vibration. Further, as described above, the single sound generated when the parts start to slide can be improved by using the acrylic-vinyl chloride based paint as the base paint. FIG. 1 shows an outline of the friction test by reciprocating motion used in the test example. As shown in FIG. 1, when a test of sliding the test object 2 on the test object 1 is performed, the coefficient of friction between two objects generally changes with time as shown in FIG. Data are obtained with varying friction coefficients for.

It is effective to reduce the difference between the coefficient of friction and the coefficient of dynamic friction for a single sound, but in order to prevent a sound generated by continuous micro vibration, fluctuation of the coefficient of dynamic friction (μd) is required. It is more effective to reduce the width.

On the other hand, as a result of examining from the viewpoint of squeaking noise, the acrylic-vinyl chloride type coating which has been conventionally applied to the surface of automobile interior parts for the purpose of lowering gloss etc.
It was revealed that silica particles, which are generally added as a matting agent for paints, deteriorate the dynamic friction coefficient.

For this reason, the present inventors have added various fine particles other than silica to the acrylic-vinyl chloride type coating material and measured the width of the dynamic friction coefficient. As a result, the average particle diameter is 1 to 50 μm.
By containing spherical or lumpy rubber fine particles in the range of 1 to 60% by weight as a solid content, it becomes possible to reduce the width of the dynamic friction coefficient, and as a result,
The effect of preventing squeaking noise was found.

The average particle size of the rubber-based fine particles is preferably in the range of 1 to 50 μm, particularly preferably 1 to 30 μm.
If the average particle size of the rubber-based fine particles is less than 1 μm, the particles will settle in the coating film to form no unevenness on the surface, the matte effect will be lost, and the friction characteristics will be deteriorated. On the contrary, when it exceeds 50 μm, the thickness of the surface treatment agent layer is about 30 μm at the maximum, so that the abrasion resistance is deteriorated.

The shape of the rubber-based fine particles is required to be spherical or agglomerated in order to obtain the effects of the present invention, and particularly spherical is preferable. The content of the rubber-based fine particles is preferably in the range of 1 to 60% by weight, particularly preferably 10 to 40% by weight as a solid content. If the content is less than 1% by weight, the effect of preventing abnormal noise becomes insufficient and the matting effect also disappears. On the other hand, if it exceeds 60% by weight, it becomes impossible to form a coating film or the abrasion resistance of the coating film becomes insufficient. In the present invention, as long as it is within this range, the squeaking noise preventing effect is recognized, so that the content can be adjusted for the purpose of adjusting gloss.

The rubber fine particles are not particularly limited, but NBR rubber fine particles or SBR rubber fine particles are particularly used from the viewpoints of dynamic friction coefficient and glossiness among the rubber fine particles added to prevent squeaking noise. Is preferred.

The squeaking noise-preventing surface treating agent of the present invention comprises 1 to 60 rubber fine particles in an acrylic-vinyl chloride coating resin.
It can be prepared by adding 3 parts by weight, and then introducing into a disperser a three-roll, ball mill, pot mill, steel mill, pebble mill, sand mill, roll mill, etc., and uniformly mixing and dispersing. At this time, it is preferable to add a surfactant in order to enhance the dispersibility. Next, the mixed and dispersed material is diluted according to the coating method.

The squeaking noise-preventing surface treating agent of the present invention thus obtained can be used in the same form as the current surface treating agent for the skin material. That is, it is applied by spraying, airless spraying, or gravure roll coating on the sheet surface in the process of manufacturing a PVC sheet that is the skin of the interior component. Other parts and parts may be spray-painted, brush-painted, roller-painted, or dip-painted, depending on the shape and surface condition of the application part.

Parts to which the squeaking noise preventing surface treatment agent of the present invention is applied include an instrument panel, a door trim, and
In addition to skins such as pillar garnish, sun visor and seat leather, assembly parts such as meter clusters and console boxes can be mentioned. The material of the parts to be applied is, in particular, a PVC skin for the skin, other parts, and various resins, rubbers, metals, and glass for the parts.

[0021]

Next, the operation of the present invention will be described. Acrylic-vinyl chloride resin for coating material has spherical or lumpy rubber fine particles having an average particle diameter in the range of 1 to 50 μm as solid content of 1 to
By adding it in the range of 60% by weight, it is possible to prevent the squeaking noise generated by the steady vibration during traveling of the vehicle.

To prevent the squeaking noise, spherical rubber particles are added to the coating resin to prevent a localized concentrated load from being applied to the contact surface, thereby making the squeaking noise less likely to occur. Also, from a macroscopic point of view, the added rubber-based fine particles soften the coating film, and even when a squeaking noise is generated, it is easily attenuated (the width of μd is reduced).

In the present invention, by making the shape of the rubber-based particles spherical or lumpy, it is effective in preventing the squeaking noise. That is, in the case of particles having an irregular shape other than spherical or lump, stress concentration cannot occur in the particles, so that the squeaking noise cannot be effectively prevented. Since the surface treatment agent layer of the present invention is formed in the sheet surface treatment step that has been conventionally performed, it is not necessary to introduce a new step, and it is possible to omit the non-woven fabric attaching step that is conventionally performed. it can.

Since the squeaking noise preventing function is added to the conventional surface treatment agent, the appearance quality is not impaired, so that it can be applied to the visible part. In addition, since a coating layer is formed on the entire sheet used as the skin, squeaking noises between instrument panels, door trims, pillar garnishes, sun visors, seat leathers, etc., and parts that are assembled with them and parts that interfere with them. Can also be reduced.

[0025]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.

Example 1 NBR rubber fine particles (NBR powder manufactured by Nippon Zeon Co., trade name; Nipol;
1411 classified by sedimentation method, average particle size 30μ
m, true sphere) as a solid content of 40% by weight, and a surfactant (manufactured by San Nopco Ltd., toluene nonionic surfactant, trade name; SN Dispersant 4115) is added by 1% by weight to NBR particles. And then stirred. Then, mix and disperse with a three-roll mill, and dilute with 50%.
The squeaking noise preventing surface treatment agent of Example 1 was prepared.

Example 2 Except for using NBR rubber fine particles as solid content of 20% by weight as the rubber fine particles added to the acrylic-vinyl chloride coating resin, the same procedure as in Example 2 was carried out. An anti-squeaking surface treatment agent was prepared.

Example 3 The same procedure as in Example 1 was repeated except that NBR rubber particles having an average particle size of 50 μm were used as the rubber particles added to the acrylic-vinyl chloride paint resin. An anti-sound surface treatment agent was prepared.

Example 4 SBR rubber fine particles (general commercially available product, SBR powder classified by sedimentation method, average particle size 50 μm, true sphere) were added to an acrylic-vinyl chloride resin for coating in an amount of 40% by weight as a solid content. Then, 1% by weight of a surfactant (manufactured by San Nopco Co., Ltd., a toluene-based nonionic surfactant, trade name; SN Dispersant 4115) was added to the SBR particles, followed by stirring. Then, after mixing and dispersing with a three-roll mill, the mixture was diluted with a diluent to 50% to prepare a squeaking noise preventing surface treating agent of Example 4.

Example 5 The same procedure as in Example 1 was repeated except that NBR rubber fine particles having an average particle size of 5 μm were used as the rubber fine particles to be added to the acrylic-vinyl chloride resin. An anti-sound surface treatment agent was prepared.

Example 6 NBR rubber fine particles as a solid content of 5% by weight as rubber fine particles added to an acrylic-vinyl chloride coating resin.
The squeaking noise preventing surface treating agent of Example 6 was prepared in the same manner as in Example 1 except that.

Comparative Example 1 A squeaking noise preventing surface treating agent of Comparative Example 1 was prepared in the same manner as in Example 1 except that NBR rubber fine particles were not added.

Comparative Example 2 Instead of NBR rubber fine particles, silica particles (average particle size 2.0
μm, amorphous) was added in the same manner as in Example 1 except that 30% by weight was added to prepare the squeaking noise preventing surface treatment agent of Comparative Example 2.

Comparative Example 3 Except for using 30% by weight of acrylic fine particles (average particle size 8.0 μm, true sphere) as fine particles to be added to the acrylic-vinyl chloride coating resin, the same procedure as in Example 1 was carried out. The squeaking noise preventing surface treatment agent of Comparative Example 3 was prepared.

Comparative Example 4 The same as Example 1 except that NBR rubber fine particles (average particle diameter 60 μm, true sphere) were added as 40% by weight as solid content as rubber fine particles to be added to the acrylic-vinyl chloride coating resin. Similarly, the squeaking noise preventing surface treatment agent of Comparative Example 4 was prepared.

Comparative Example 5 Except for Example 1, except that NBR rubber fine particles (average particle size 20 μm, true sphere) were added as 70% by weight as solid content as rubber fine particles to be added to the acrylic-vinyl chloride coating resin. Similarly, the squeaking noise preventing surface treatment agent of Comparative Example 5 was prepared.

Comparative Example 6 A non-woven fabric conventionally used is referred to as Comparative Example 6.

Comparative Example 7 A comparative example was carried out in the same manner as in Example 1 except that NBR rubber fine particles were added as solid content of 0.5% by weight as the rubber fine particles to be added to the acrylic-vinyl chloride based coating resin. 7
A squeaking noise preventing surface treatment agent was prepared.

Test Example In order to compare the squeaking noise preventive effect of each of the surface treatment agents prepared in Examples 1 to 3 and Comparative Examples 1 to 5, a vinyl chloride (PVC) sheet which has been conventionally used and whose surface is not treated is used. Each surface treatment agent was applied to and the coating film was cured so that the dry film thickness was 30 μm to prepare an evaluation test sheet.

A friction test by reciprocating motion shown in FIG. 1 was conducted by using a general PVC sheet for automobile interior as each sheet thus obtained and a counterpart material of Comparative Example 6 to evaluate the friction characteristics and to produce a squeaking noise. The existence was confirmed. Further, the 60 degree surface glossiness of the coating film coated with each surface treatment agent was measured by a gloss meter. Table 1 shows the results.

[0041]

[Table 1]

From the results shown in Table 1, no noise was generated when the squeaking noise preventing surface treatment agent of the example was used, and the width of the dynamic friction coefficient was as small as that of the non-woven fabric currently used for the squeaking noise countermeasure. It can be seen that it has a squeaking noise preventing effect and further has a matting effect. On the other hand, the surface treatment agents of Comparative Example 1 and Comparative Example 7 are effective against the squeaking noise, but have no matting effect, and thus are inferior in marketability. Further, in Comparative Examples 2 and 3, the matting effect was confirmed, but the range of the dynamic friction coefficient became large, and a squeaking noise was generated. In Comparative Examples 4 and 5, the powder of the surface treatment agent dropped (peeled) during the friction test and was not practical.

[0043]

The squeaking noise preventing surface treatment agent of the present invention is an acrylic-vinyl chloride resin for paints and has an average particle size of 1 to 50.
By containing spherical or lumpy rubber fine particles in the range of μm in the range of 1 to 60% by weight as a solid content,
Not only does it provide a squeaking noise prevention effect, but also has the excellent effect of simplifying the work process. Furthermore, it is also applied to parts that are easily visible when the door is open, such as the door trim and instrument end or seaside. The effect that can be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a friction test by reciprocating motion used in a test example.

FIG. 2 is a diagram showing a change in a friction coefficient with respect to time obtained by the friction test shown in FIG.

[Explanation of symbols]

 1 DUT 2 DUT

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // C08J 7/04 Z

Claims (2)

[Claims] 1. An acrylic-vinyl chloride coating resin,
A squeaking noise-preventing surface-treating agent comprising spherical or lumpy rubber fine particles having an average particle size in the range of 1 to 50 μm in a range of 1 to 60% by weight as a solid content. 2. The rubber-based fine particles are NBR rubber fine particles or S.
The squeaking noise preventing surface treatment agent according to claim 1, wherein the surface treatment agent is BR rubber fine particles.