JP2008013591A - Antifouling film for vehicle, antifouling coating for vehicle, antifouling member for vehicle, manufacturing method of antifouling member for vehicle, wheel and manufacturing method of wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antifouling film for vehicles, an antifouling coating for vehicles, an antifouling member for vehicles and a wheel that reduce the amount of brake dust attaching to members for vehicles and enhance cleaning properties of brake dust attached to members for vehicles. <P>SOLUTION: The antifouling film for vehicles exhibiting antifouling properties satisfies at least two of a half-value period of static charge within the range of 0.01-100 sec, a surface free energy within the range of 35-75 mN/m and a surface roughness of a coating film within the range of 4-70 μm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle antifouling film, a vehicle antifouling paint, a vehicle antifouling member, a method for producing a vehicle antifouling member, a wheel and a method for producing a wheel.

  Vehicle members such as automobiles and airplanes are contaminated by combustion products in exhaust gas, tire wear powder, brake dust and the like (hereinafter collectively referred to as dust). Cleaning contaminated vehicle parts is a heavy labor. In particular, among the vehicle members, the wheel has a larger amount of dust adhesion than other vehicle members. Therefore, development has been carried out to prevent dust from adhering to vehicle members (especially wheels) (decrease in the amount of adhesion), and to facilitate cleaning of dust adhering to vehicle members (improving detergency). It has been broken.

  For example, Patent Document 1 proposes a wheel that reduces the adhesion amount of dust by forming an antifouling film containing photocatalyst particles on the surface of the wheel.

  In addition, for example, in Patent Documents 2 to 4, by forming a surface layer containing photocatalyst particles and a water-repellent substance (silicone or fluororesin) on the surface of the wheel, the amount of dust attached is reduced and the cleaning property is improved. Wheels have been proposed.

JP 2003-306648 A JP-A-10-193901 Japanese Patent Laid-Open No. 10-46054 Japanese Patent Laid-Open No. 10-129201

  However, in the wheel of patent documents 1-4, the adhesion amount of the dust adhering to a wheel cannot be reduced, and the cleaning property of dust is not enough. This is because the physical factors resulting from the adhesion of the dust to the wheel and the cleanability are not clarified. Also, it is not considered that much of the dust adhering to the wheel is brake dust.

  The present invention relates to a vehicle antifouling film that can reduce the amount of dust, particularly brake dust, on a vehicle member, and can improve the cleaning performance of dust, particularly brake dust, on a vehicle member. An antifouling paint, a vehicle antifouling member and a wheel are provided.

  The present invention is a vehicle antifouling film having an antifouling property, wherein the vehicle antifouling film has a charging half-life in the range of 0.01 to 100 seconds and a surface free energy of 35 mN / m to 75 mN / The range of m and the coating film surface roughness satisfy at least two of the range of 4 to 70 μm.

  The present invention is also a vehicle antifouling paint that imparts antifouling properties to the surface of a vehicle member, the vehicle antifouling paint including a binder, and 2.5 to 15 parts per 100 parts by weight of the binder. The antistatic agent by weight and the volume average particle diameter are in the range of 4 μm to 70 μm, and further include at least one of 30 to 100 parts by weight of fluorine particles with respect to 100 parts by weight of the binder.

  In the vehicle antifouling paint, the vehicle antifouling film obtained by applying the vehicle antifouling paint to the vehicle member has a charging half-life in the range of 0.01 to 100 seconds. It is preferable to satisfy at least two of the free energy in the range of 35 mN / m to 75 mN / m and the coating film surface roughness in the range of 4 to 70 μm.

  The present invention also relates to a vehicle member including a vehicle antifouling film having antifouling properties, wherein the vehicle antifouling film has a surface half-life of 0.01 to 100 seconds and a surface free energy. Satisfies a range of 35 mN / m to 75 mN / m and a coating film surface roughness of 4 to 70 μm.

  In the method for producing a vehicle antifouling member of the present invention, the vehicle antifouling paint is applied to the surface of the vehicle antifouling member.

  The present invention also provides a wheel including a vehicle antifouling film having antifouling properties, wherein the vehicle antifouling film has a charging half-life in the range of 0.01 to 100 seconds and a surface free energy of 35 mN. / M to 75 mN / m, and the coating film surface roughness satisfies at least two in the range of 4 to 70 μm.

  In the wheel manufacturing method of the present invention, the vehicle antifouling paint is applied to the wheel surface.

  In the vehicle antifouling film according to the present invention, the property values of the vehicle antifouling film include a charging half-life in the range of 0.01 to 100 seconds, a surface free energy in the range of 35 mN / m to 75 mN / m, By satisfying at least two or more of the coating film surface roughness in the range of 4 to 70 μm, the amount of dust adhering to the vehicle member can be reduced and the detergency of the dust adhering to the vehicle member can be improved. it can. In particular, it is possible to reduce the adhesion amount of the brake dust and improve the cleaning performance.

  In the antifouling paint for vehicles according to the present invention, the binder is included, the antistatic agent is 2.5 to 15 parts by weight with respect to 100 parts by weight of the binder, and the volume average particle diameter is in the range of 4 μm to 70 μm. Dust that adheres to the vehicle member by further applying at least one of 30 to 100 parts by weight of fluorine particles to 100 parts by weight, and applying the vehicle antifouling paint to the surface of the vehicle member. It is possible to reduce the amount of adhesion and improve the cleaning performance. In particular, it is possible to reduce the adhesion amount of the brake dust and improve the cleaning performance.

  Further, the vehicle antifouling member and wheel according to the present invention include a vehicle antifouling film having antifouling properties, and the property half-life of the vehicle antifouling film has a charging half-life of 0.01 seconds to 100 seconds. Of dust adhering to a vehicle member and a wheel by satisfying at least two of the following range, the surface free energy within the range of 35 mN / m to 75 mN / m, and the coating film surface roughness of 4 to 70 μm The amount can be reduced and the cleaning property can be improved. In particular, it is possible to reduce the adhesion amount of the brake dust and improve the cleaning performance.

  Embodiments of the present invention will be described below.

  First, the vehicle antifouling film according to the present invention will be described below.

  The vehicle antifouling film according to this embodiment has antifouling properties, and the physical properties of the vehicle antifouling film are in the range of a charging half-life of 0.01 seconds to 100 seconds, and the surface free energy is It satisfies at least two of the ranges of 35 mN / m to 75 mN / m and the coating film surface roughness of 4 to 70 μm.

  The antifouling property is to reduce the amount of dust adhering to a vehicle member, which will be described later, or to improve the cleaning property of the adhering dust. Here, the reduction in the amount of adhesion or the improvement in the cleaning property is intended for a vehicle member that does not include a vehicle antifouling film. The adhesion amount is the amount of dust per unit area of the vehicle member, and the cleaning property is confirmed visually or by a color difference meter after the vehicle member is washed with running water at a constant flow rate for a certain period of time. This indicates how much dust adhered to the vehicle member can be removed.

  The charging half-life is a time when the voltage charged when a high voltage is forcibly applied to the vehicle antifouling film is a saturation voltage (maximum charged potential) and the maximum charged potential is halved. The charging half-life of the antifouling film for vehicles is in the range of 0.01 seconds to 100 seconds, preferably in the range of more than 10 seconds and not more than 30 seconds. If it is longer than 100 seconds, the amount of dust, particularly brake dust, cannot be reduced. The measurement of the charging half-life can be performed by a charged charge decay rate measuring instrument (H-0110 manufactured by Sisid Electrostatic Co., Ltd.), and the measurement conditions are in accordance with JIS L 1097.

  The saturation voltage of the vehicle antifouling film that is charged by forcibly applying a high voltage is preferably 10 kV, for example. However, it is not necessarily limited to this.

Surface free energy is a quantification of the surface state of a substance, and is the force by which molecules on a solid surface pull together. This force is called intermolecular force (Van der Waals force), and is a force that attracts molecules rather than chemical bonds such as ionic bonds and covalent bonds through which electrons move. Molecules on the surface of solid (liquid) are pulled from neighboring molecules on the surface and molecules inside the substance, but are not pulled from the outside, so they are pulled inside the substance and try to go inside. This phenomenon occurs on the entire surface, and as a result, the surface of the material is made as small as possible. This force is called surface tension, but from the standpoint of thermodynamics, it is called surface free energy and both are equivalent. The surface free energy of the antifouling film for vehicles is in the range of 35 mN / m to 75 mN / m, preferably in the range of 40 mN / m to 45 mN / m. If the surface free energy of the vehicle antifouling film is less than 35 mN / m, the amount of dust, especially brake dust, cannot be reduced, and the cleaning performance of the adhering dust, especially brake dust, cannot be improved. If it is greater than 75 mN / m, the amount of dust, especially brake dust, cannot be reduced. The surface free energy can be obtained by the Owens equation. Specifically, from the water contact angle and the liquid paraffin contact angle θ and the liquid surface free energy γ _L , the solid dispersion term component γ _s ^d and the solid polar term component γ _s ^p are obtained by the following equation (1). The surface free energy is obtained from the obtained γ _s ^d and γ _s ^p by the following equation (2). The surface free energy of water is 72.8 mN / m (dispersion component γ ^d = 21.8 mN / m, polar term component γ ^p = 51 mN / m), and the surface free energy of liquid paraffin is 32.8 mN / m ( The dispersion term component γ ^d = 32.8 mN / m).
γ _L (1 + cos θ) = 2 (γ _s ^d γ _L ^d ) ^1/2 +2 (γ _s ^p γ _L ^p ) ^1/2 (1)
γ _s = γ _s ^d + γ _s ^p (2)
γ _s : surface free energy of solid (vehicle antifouling film) γ _s ^d : solid dispersion term component γ _s ^p : solid polarity term component γ _L ^d : liquid dispersion term component γ _L ^p : liquid polarity term Component θ: Contact angle γ _L : Surface free energy of liquid

  The water contact angle of the vehicle antifouling film that can be determined as described above is preferably in the range of 130 ° to 170 °, for example. If the water contact angle is smaller than 130 °, the amount of dust attached may not be reduced. However, it is not limited to this.

  Further, the liquid paraffin contact angle of the vehicle antifouling film that can be obtained as described above is preferably in the range of 10 ° to 20 °, for example. If the liquid paraffin contact angle is outside the above range, the amount of dust attached may not be reduced. However, it is not limited to this.

  The surface roughness is a 10-point average roughness (Rz) per unit area. The surface roughness (Rz) of the vehicle antifouling film is in the range of 4 μm to 70 μm, preferably in the range of 20 μm to 50 μm. If the surface roughness is outside the range of 4 μm to 70 μm, the amount of dust, particularly brake dust, cannot be reduced. The surface roughness (Rz) can be measured with a wide-field scanning confocal microscope (HD100 manufactured by Lasertec) or the like.

  The film thickness of the vehicle antifouling film is not particularly limited, but is preferably in the range of 5 μm to 75 μm.

  The vehicle antifouling film according to this embodiment is formed and used by applying a vehicle antifouling paint according to this embodiment described below to a vehicle member.

  Hereinafter, the vehicle antifouling paint according to this embodiment will be described.

  The vehicle antifouling paint according to the present embodiment includes a binder, the antistatic agent is 2.5 to 15 parts by weight with respect to 100 parts by weight of the binder, and the volume average particle diameter is in the range of 4 μm to 70 μm. It further includes at least one of 30 to 100 parts by weight of fluorine particles with respect to parts by weight.

  The binder is not particularly limited as long as it can form a vehicle antifouling paint as a film (vehicle antifouling film) and attach it to the surface of a vehicle member to be described later. For example, a paint containing a thermosetting resin is preferable from the viewpoint of adhesiveness. The paint containing a thermosetting resin is a mixture of a thermosetting resin exemplified below and a solvent such as water or ethanol. As the thermosetting resin, at least one resin selected from acrylic resins, epoxy resins, polyester resins, polyether resins, phenol resins, urea resins, melamine resins, alkyd resins, or the like, or What mixed the said at least 1 sort (s) of resin and crosslinking agent, for example, acrylic-melamine resin, polyester-melamine resin, etc. are mentioned.

  As a specific example of the binder, an acrylic paint or the like can be used. However, it is not limited to these.

  The content of the antistatic agent is in the range of 2.5 to 15 parts by weight, more preferably in the range of 5 to 10 parts by weight with respect to 100 parts by weight of the binder. If the content is less than 2.5 parts by weight, when the vehicle antifouling film is formed, the amount of dust, particularly brake dust, cannot be reduced, and if it is more than 15 parts by weight, the color may change.

  The antistatic agent is preferably a compound containing a quaternary ammonium ion or a nitrogen atom.

  Content of a fluorine particle is the range of 30 weight part-100 weight part with respect to 100 weight part of binders, More preferably, it is the range of 50 weight part-80 weight part. If the content of fluorine particles is outside the range of 30 to 100 parts by weight, the amount of dust, particularly brake dust, may not be reduced. The volume average particle diameter of the fluorine particles is in the range of 4 μm to 70 μm, more preferably in the range of 10 μm to 40 μm. If the particle size is less than 4 μm, the effect of agglomerating particles becomes high, and the amount of dust, especially brake dust, cannot be reduced. If the value is more than 70 μm, the amount of dust, particularly brake dust, cannot be reduced.

  Examples of the fluorine particles include particles of polytetrafluoroethylene, polychlorotrifluoroethylene, polyhexafluoropropylene, tetrafluoroethylene-hexafluoropropylene copolymer, and the like.

  An antifouling paint for vehicles can be obtained by mixing the above binder with an antistatic agent and fluorine particles (at least one of the antistatic agent and fluorine particles) and stirring. The stirring time, stirring temperature, etc. are not particularly limited. Further, other surfactants or the like may be further mixed.

  The vehicle antifouling member according to this embodiment can be obtained by applying the obtained vehicle antifouling paint to the surface of the vehicle member. In addition, it is desirable to heat (or dry) the vehicle antifouling member in order to suitably fix the vehicle antifouling film on the surface of the vehicle member during application.

  The vehicle antifouling member includes a vehicle antifouling film obtained by applying a vehicle antifouling paint to the vehicle member surface. The vehicle antifouling film is the same as described above.

  The vehicle member is not particularly limited as long as it is a base material used for automobiles, motorcycles, airplanes and the like. Examples thereof include wheels, bodies, roofs, and the like in which a plastic substrate such as polypropylene and urethane, a metal substrate such as aluminum, and the like are used.

  The application method is not particularly limited, and can be performed by, for example, a spray coating method, a dip coating method, a flow coating method, a spin coating method, a roll coating method, a brush coating, a sponge coating, or the like.

  The heating (or drying) conditions are not particularly limited, but for example, those performed at 80 ° C. to 120 ° C. for 10 to 20 minutes are preferable.

  As described above, the vehicle antifouling film according to this embodiment has a charging half-life in the range of 0.01 to 100 seconds, a surface free energy in the range of 35 mN / m to 75 mN / m, and a coating film surface roughness of 4 to 4. By satisfy | filling at least 2 or more among the range of 70 micrometers, the adhesion amount of dust, especially brake dust can be reduced, and the washing | cleaning property of brake dust can be improved. Further, the vehicle antifouling film according to the present embodiment has an antistatic agent of 2.5 to 15 parts by weight and a volume average particle diameter of 4 to 70 μm with respect to 100 parts by weight of the binder and 100 parts by weight of the binder. The amount of dust adhering to the vehicle member is reduced by applying the vehicle antifouling film to the surface of the vehicle member. Reduction and cleanability can be improved.

  Hereinafter, although an example and a comparative example are given and the present invention is explained more concretely, the present invention is not limited to the following examples.

  An antifouling paint for vehicles was prepared by mixing and stirring 100 parts by weight of acrylic paint and 75 parts by weight of fluorine particles having a volume average particle diameter of 1 μm or less with respect to 100 parts by weight of acrylic paint. This was designated Example 1. Further, 100 parts by weight of the same acrylic paint as described above and 50 parts by weight of the same fluorine particles as described above were mixed and stirred to prepare a vehicle antifouling paint. This was designated Example 2. Similarly, 100 parts by weight of acrylic paint, 100 parts by weight of fluorine particles, and 5 parts by weight of an antistatic agent were mixed and stirred to prepare a vehicle antifouling paint. This was designated as Example 3. Furthermore, 100 parts by weight of the acrylic paint and 10 parts by weight and 2.5 parts by weight of the antistatic agent were mixed and stirred to prepare a vehicle antifouling paint. These were designated as Examples 4 and 5.

  100 parts by weight of acrylic paint was set as Comparative Example 1, and 100 parts by weight of acrylic paint having a water immersion function was set as Comparative Example 2.

<Measurement of physical properties>
The vehicle antifouling paint of Example 1 was applied on a 5 cm square aluminum plate by a spray coating method to a coating thickness of 30 μm, and then dried at 120 ° C. for 20 minutes to obtain a vehicle antifouling film. . The charging half-life of the vehicle antifouling film obtained from the coating material of Example 1 was measured according to JIS L 1097 using a charged charge decay rate measuring instrument (H-0110 manufactured by Sicid Electrostatic Co., Ltd.). Moreover, the surface free energy was calculated | required by said Formula (1) and (2). Furthermore, the surface roughness (Rz) was measured with a wide-field scanning confocal microscope (HD100 manufactured by Lasertec Corporation), and Rz was calculated. Moreover, the charging half-life, surface free energy, and surface roughness of the vehicle antifouling film obtained in the same manner as described above from the vehicle antifouling paints of Examples 2 to 5 were measured in the same manner as described above. The results are shown in Table 1 below.

  The charge half-life, surface free energy, and surface roughness of the coatings obtained from the paints of Comparative Examples 1 and 2 were measured in the same manner as described above. The results are shown in Table 1 below.

<Measurement of adhesion amount>
The vehicle antifouling paint of Example 1 was applied on an aluminum wheel by a spray coating method so as to have a coating thickness of 30 μm, and then dried at 120 ° C. for 20 minutes. Brake dust was allowed to adhere to the surface of the coating film formed on the aluminum wheel using a brake dynamo testing machine, and the amount of adhesion was determined. The results are shown in Table 1 below. In addition, the test of the brake dynamo testing machine is performed by using an aluminum wheel (size: 16 × 6.5 inches), a tire (size: 205/50/16 inch), a brake pad, a caliper (15 inches), and a rotor (diameter 275 mm × 25V) was attached. The adhesion amount was determined from the difference between the weight of the aluminum wheel after the test by the brake dynamo testing machine and the weight of the aluminum wheel from which the brake dust adhered to the aluminum wheel was removed by the adhesive tape. (Or it may be obtained from the difference in the weight of the aluminum wheel before and after the test by the brake dynamo testing machine).

<Evaluation of detergency>
FIG. 1 shows a schematic diagram of the evaluation of cleaning performance of an aluminum wheel. Using the above-mentioned brake dynamo testing machine, the dotted line portion (decorative window portion) of the aluminum wheel 1 on which brake dust was adhered was washed with running water for about 10 liters / minute for 10 seconds. After washing, the amount of brake dust adhering to the aluminum wheel was visually checked and evaluated according to the following criteria. The results are shown in Table 1 below.
◎: Equivalent to new product ○: Slightly dirty △: Slightly washed out but dirty ×: Not washed out at all

  2 to 4 show the relationship between the charge half-life, surface free energy, and surface roughness of Examples 1 to 5 and Comparative Examples 1 and 2, and FIG. 5 shows the adhesion to the content of the antistatic agent. The relationship of the amount is shown, and FIG. 6 shows the relationship of the adhesion amount to the fluorine particle content.

  As can be seen from the results shown in Table 1 and FIGS. 2 to 6, the antifouling paint for vehicles of Examples 1 to 5 containing at least one part by weight of fluorine particles and an antistatic agent is applied to an aluminum wheel. As a result, the amount of brake dust deposited on the aluminum wheel could be reduced by 20% or more compared to the case where the paints of Comparative Examples 1 and 2 not containing them were applied. This is because the values of the charging half-life, surface free energy, and surface roughness of the antifouling film for vehicles formed by applying the antifouling paint for vehicles of Examples 1 to 5 are applied to dust such as brake dust. This is because it was possible to obtain difficult physical property values. As specific physical property values, as can be seen from the results of Table 1, the charging half-life is 100 seconds or less, the surface free energy is 35 mN / m or more, and the surface roughness (Rz) is in the range of 4 to 70 μm. Of these, 2 or more were satisfied. Furthermore, it was found that the coating material of Example 1 satisfying the above ranges of the surface free energy and the surface roughness was optimal as a vehicle antifouling film capable of suitably reducing the adhesion amount.

  In addition, as can be seen from the evaluation results of the cleaning properties in Table 1 above, the aluminum wheels coated with the vehicle antifouling paints of Examples 1 to 5 had the brake dust adhered to the aluminum wheels in the dotted lines after cleaning. It was washed away suitably. On the other hand, the aluminum wheels coated with the paints of Comparative Examples 1 and 2 could hardly wash off the brake dust adhering to the aluminum wheel in the dotted line portion even after washing. As a vehicle antifouling film having good detergency, it was found that the coating material of Example 1 satisfying the above ranges of surface free energy and surface roughness was optimal.

It is the schematic of the cleaning property evaluation of an aluminum wheel. It is a figure which shows the relationship of the adhesion amount with respect to the charging half life of an Example and a comparative example. It is a figure which shows the relationship of the adhesion amount with respect to the surface free energy of an Example and a comparative example. It is a figure which shows the relationship of the adhesion amount with respect to the surface roughness of an Example and a comparative example. It is a figure which shows the relationship of the adhesion amount with respect to content of the antistatic agent of an Example and a comparative example. It is a figure which shows the relationship of the adhesion amount with respect to content of the fluorine particle of an Example and a comparative example.

Explanation of symbols

  1 Aluminum wheel.

Claims (7)

A vehicle antifouling film having antifouling properties,
The vehicle antifouling film has at least a charge half-life of 0.01 seconds to 100 seconds, a surface free energy of 35 mN / m to 75 mN / m, and a coating film surface roughness of 4 to 70 μm. A vehicle antifouling film characterized by satisfying two or more. A vehicle antifouling paint that imparts antifouling properties to the surface of a vehicle member,
The vehicle antifouling paint contains a binder, and the antistatic agent is 2.5 to 15 parts by weight with respect to 100 parts by weight of the binder and the volume average particle diameter is in the range of 4 μm to 70 μm. An antifouling paint for vehicles, further comprising at least one of 30 to 100 parts by weight of fluorine particles.   3. The vehicle antifouling paint according to claim 2, wherein the vehicle antifouling film obtained by applying the vehicle antifouling paint to the vehicle member has a charging half-life of 0.01 seconds to 100 seconds. An antifouling paint for vehicles, wherein the surface free energy satisfies at least two of the range of 35 mN / m to 75 mN / m and the coating film surface roughness of 4 to 70 μm. A vehicle antifouling member comprising a vehicle antifouling film having antifouling properties,
The vehicle antifouling film has at least a charge half-life of 0.01 seconds to 100 seconds, a surface free energy of 35 mN / m to 75 mN / m, and a coating film surface roughness of 4 to 70 μm. A vehicle antifouling member characterized by satisfying two or more.   A method for manufacturing a vehicle antifouling member, comprising applying the vehicle antifouling paint according to claim 2 or 3 to the surface of the vehicle member. A wheel including a vehicle antifouling film having antifouling properties,
The vehicle antifouling film has at least a charge half-life of 0.01 seconds to 100 seconds, a surface free energy of 35 mN / m to 75 mN / m, and a coating film surface roughness of 4 to 70 μm. A wheel characterized by satisfying two or more. A method for manufacturing a wheel, comprising applying the vehicle antifouling paint according to claim 2 or 3 to the wheel surface.

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