JP2001011393A - Surface-treatment composition for painted surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition for treating the painted surface of automobiles, etc., where a coating agent is adsorbed/retained in pores of an abrasive which enables both polish of painted surface and formation of coating film to simultaneously be finished. SOLUTION: When a paintwork surface-treatment composition for a painted surface comprises a coating agent such as carnauba wax, silicone resin or fluororesin and an abrasive such as silica gel, the abrasive comprises inorganic porous gel and the coating agent is adsorbed/retained in pores of the abrasive. The abrasive preferably has an average particle diameter of 0.01-10 μm and a pore volume of 0.2-5.0 mL/g, and is included in a content of 1-50 wt.%. The coating agent preferably has functions imparting water repellency, glazing, antifog property and antifouling property to painted surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment composition for a painted surface capable of polishing a painted surface of, for example, an automobile and forming a coating film such as water repellency and glazing in one step.

[0002]

2. Description of the Related Art
For example, polishing of a painted surface of an automobile or the like (for example, removal of dirt and smoothing of the painted surface) and formation of a coating film such as water repellency and gloss have been performed in two steps. That is, first, the unevenness of the painted surface is polished and smoothed with an abrasive, and then a coating agent is applied to the polished painted surface to form a coating film such as water repellent or glazed.

However, it is troublesome for users to perform two steps on a painted surface and separately perform polishing of the painted surface and formation of a coating film, and there is a demand that both operations be completed in one process. Was.

In order to meet such a demand, there has been proposed a surface treatment composition in which an abrasive such as alumina powder is dispersed in a water emulsion together with a coating agent. According to this surface treatment composition, the abrasive in the composition can remove dirt and the like on the painted surface by polishing, and at the same time, can form a coating film such as water repellent and glazed on the painted surface. In addition, polishing (dirt removal) and formation of a coating film can be completed in one step, and the labor required for them can be greatly reduced.

However, in the above composition, an abrasive having a high specific gravity, such as alumina powder, is dispersed in the water emulsion. Coating agent may be separated, and the amount of abrasive or coating agent may be too small or too large during use, making it impossible to reliably perform polishing with abrasive and coating film formation with coating agent. was there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and can perform polishing of a painted surface and formation of a coating film in one step, and can reliably perform polishing and formation of a coating film. It is an object of the present invention to provide a surface treatment composition for a painted surface that is obtained.

[0007]

According to a first aspect of the present invention, there is provided a surface treatment composition for a painted surface comprising a coating agent and an abrasive, wherein the abrasive is made of a porous inorganic material. The gist of the present invention is a surface treatment composition for a painted surface, which is made of a gel and has a coating agent adsorbed and held in pores of the abrasive.

[0008] The gist of the invention according to claim 2 is a surface treatment composition for a painted surface, wherein the abrasive is silica gel.

The gist of the invention according to claim 3 is a surface treatment composition for a painted surface, characterized in that the abrasive has an average particle size of 0.01 to 10 microns.

The gist of the invention according to claim 4 is a composition for surface treatment of a painted surface, characterized in that the pore volume of the abrasive is 0.2 to 5.0 ml / g.

The gist of the invention according to claim 5 is a composition for surface treatment of a painted surface, characterized in that the content of the abrasive is 1 to 50% by weight.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the surface treatment composition for a painted surface of the present invention will be described in detail. The surface treatment composition for a painted surface (hereinafter, simply referred to as a composition) of the present invention contains a coating agent and an abrasive.

The composition of the present invention is prepared, for example, in Example 1 described below.
As shown in (3) and (3), both the form in which the coating agent and the abrasive are dispersed in an emulsion and the form in which the abrasive is dispersed in the coating agent as shown in Examples 2 and 4 can be adopted.

The coating agent in this composition forms a coating film having one or more functions such as water repellency, glazing, antifogging property and antifouling property on the painted surface. It is produced by appropriately blending the following components as required.

The components constituting the coating agent include:
For example, industrial gasoline, kerosene, mineral splits, mineral terpenes, petroleum solvent components such as n-paraffin solvents, isoparaffin solvents, resin components such as silicone resins, fluororesins, acrylic resins, polyamide resins, polyurethane resins, and carnauba wax , Vegetable waxes such as candelilla wax, mineral waxes such as montan wax, petroleum waxes such as paraffin wax, microcrystalline wax, synthetic hydrocarbons,
Wax components such as modified wax such as modified wax, dimethyl silicone oil, phenylmethyl silicone oil, modified silicone oil such as amino-modified and epoxy-modified, carboxylic acids such as oleic acid, amines such as triethanolamine, morpholine, water Examples thereof include alkalis such as sodium oxide.

The abrasive in this composition is a porous gel of an inorganic substance. The abrasive has countless fine pores, and the coating agent is absorbed and held in the pores, thereby further increasing the attractive force between the fine particles, thereby increasing the viscosity of the composition. As a result, the sedimentation of the abrasive is suppressed, and the abrasive is uniformly dispersed in the composition (emulsion or coating agent).

For this reason, when this composition is applied to a painted surface, a predetermined amount of a coating agent and an abrasive are present in the composition, and the polishing of the painted surface and the formation of a coating film occur. Thus, an effect that the operation can be performed at once and reliably is derived.

The porous gel of an inorganic substance constituting the abrasive is prepared by dispersing, for example, primary particles in a liquid such as water.
A material obtained by forming a sol containing colloidal particles, which are aggregates of the primary particles, and drying the sol. The material of the primary particles (inorganic substance)
Examples thereof include silica, alumina, titania, and zirconia. Among the inorganic porous gels, those using silica as a material are suitable as abrasives because they are inexpensive and hard.

The content of the abrasive made of the inorganic porous gel is preferably in the range of 1 to 50% by weight.
Because if the abrasive content is less than 1% by weight,
If the sufficient polishing effect cannot be obtained and the content exceeds 50% by weight, the effect cannot be expected only by the increased content, which is uneconomical.

The average particle size of the abrasive (a porous gel of an inorganic substance constituting the abrasive) is preferably in the range of 0.01 to 10 microns. If the average particle size is less than 0.01 micron, the adsorption holding amount of the coating liquid decreases,
Thickening and stabilization of the composition do not progress, and sedimentation of the abrasive cannot be suppressed. The average particle size of the abrasive is 0.01
If the diameter is less than a micron, handling becomes worse. On the other hand, if the average particle size exceeds 10 microns,
There is a possibility that the abrasive becomes too heavy and settles, and furthermore, the painted surface is damaged.

The pore volume of the abrasive is preferably 0.2 to 0.2.
A range of 5.0 ml / g is preferred. That is, when the pore volume is less than 0.2 ml / g, the adsorption holding amount of the coating liquid is reduced, the composition does not thicken and stabilizes, and the sedimentation of the abrasive can be suppressed. Disappears. On the other hand, if the pore volume exceeds 5.0 ml / g, the abrasive becomes too brittle to ensure a sufficient polishing effect.

[0022]

EXAMPLES The composition of the present invention will be described in more detail with reference to the following Examples shown in Tables 1 and 2.

[0023]

[Table 1]

[0024]

[Table 2]

The compositions according to Examples 1 to 4 and Comparative Examples 1 to 4 shown in Tables 1 and 2 above were subjected to three tests for average surface roughness (Ra μm), contact angle after water resistance test, and stability. Items were evaluated for their performance. Table 3 shows the results.

Incidentally, the average surface roughness (Raμm) is based on JISk
A black painted plate specified in 2236 (glazing wax for automobiles) is polished to adjust the surface roughness.

Next, an appropriate amount of each of the compositions shown in Table 1 was added to the prepared coated plate, and the product was polished by attaching a sponge puff to a commercially available electric polisher. After polishing, the coated plate was wiped off with a soft cloth, and the average surface roughness (Ra μm) was measured.

The contact angle after the water resistance test was measured using a black painted plate having the same average surface roughness, and an appropriate amount of each of the compositions shown in Table 1 was added to the painted plate. Next, a sponge puff was attached to a commercially available electric polisher and polished. After polishing, the coated plate was wiped off with a soft cloth, and then showered using a water resistance tester, and then the contact angle of the coated plate was measured.

For stability, each composition shown in Table 1 was placed in a constant temperature bath at 50 ° C., and the properties of the composition (liquid) after 24 hours were visually observed.

[0030]

[Table 3]

[0031]

Since the composition of the present invention contains a coating agent and an abrasive, polishing of a painted surface and formation of a coating film can be completed in one step.

Further, in this composition, since the coating agent is adsorbed and held in the pores of the abrasive made of a porous gel of an inorganic substance, the composition is thickened and becomes a stable state, As a result, sedimentation of the abrasive is suppressed, the abrasive is uniformly dispersed in the composition, and when the composition is applied to a painted surface, a predetermined amount of the coating agent and the abrasive are contained in the composition. Is present, and the polishing of the painted surface and the formation of the coating film can be reliably performed.

Claims (5)

[Claims] In a surface treatment composition for a painted surface containing a coating agent and an abrasive, the abrasive is made of a porous gel of an inorganic substance, and the coating agent is adsorbed and held in pores of the abrasive. A surface treatment composition for a painted surface. 2. The composition according to claim 1, wherein the abrasive is silica gel. 3. The surface treating composition according to claim 1, wherein the abrasive has an average particle size of 0.01 to 10 μm. 4. An abrasive having a pore volume of 0.2 to 5.0 ml.
/ G, The surface treatment composition for a painted surface according to claim 1 or 2. 5. The composition according to claim 1, wherein the content of the abrasive is 1 to 50% by weight.