JPH10101973A - Surface hardness modified paint - Google Patents

Abstract

(57) [Abstract] [Problem] Recently, the import of soft southern materials has increased, and the use of soft domestic materials has increased. In some cases, it was not possible to obtain a sufficient degree of hardness to cause a pressing flaw, and as such, it could not be used as a material for table tops, furniture, building materials and the like. Therefore, development of a paint for increasing the hardness of the surface has been an issue. The present invention provides a paint having a glass bead content of 50 to 150 parts by weight based on 100 parts by weight of a resin solid content of the paint, which has an effect of hardening the surface of wood and preventing press scratches. is there. In particular, the paint is polyurethane paint,
The effect is remarkable when it is an ultraviolet-curable unsaturated polyester paint or a nitrified cotton lacquer paint. Also, after applying the above paint to wood, apply a paint that does not contain glass beads, polish the coating film, and further apply a paint that does not contain glass beads to make use of the woody surface by overcoating. It is another object of the present invention to provide a method for applying a paint having a sufficient surface hardness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for producing a rubber composition having a center particle diameter of 30 to
The present invention relates to a surface hardness modified paint having a content of glass beads of 60 μm and 50 to 150 parts by weight based on 100 parts by weight of a resin solid content of the paint, and a method of applying the same.

[0002]

2. Description of the Related Art Paint is a construction material for forming a coating film on the surface of an object. There are many types of paints, and they are used according to their respective purposes. That is, paint is generally applied to the surface of metal or wood, and lacquer, natural resin varnish, aqueous paint, oil paint, cellulose paint, synthetic resin paint, and the like are used. Conventionally, as a method of increasing the hardness of wood and preventing pushing scratches, WPC (Wood-pl
Although there have been methods of forming an elastic combination or coating an unsaturated polyester with a film thickness of 200 μm or more, there are disadvantages such as a high coating cost and a special device. Further, as an abrasion-resistant paint, Japanese Patent Application Laid-Open No.
173413 proposes a paint containing glass beads. The paint has excellent abrasion resistance in terms of the average particle size of the glass beads and the content of the paint in the paint. Not in.

[0003]

When the object to be coated is wood, its properties vary depending on the tree species, and a paint suitable for it is prepared each time because of the absorption of the paint and the unevenness of the surface. The formulation had to be considered. In particular, recently the import of soft southern materials has increased,
Also, domestically-made wood, such as soft drills and cedar, are increasingly used. For example, the conventional two-pack polyurethane paint, UV-curable unsaturated polyester paint, nitrified cotton lacquer paint, etc. cannot provide sufficient surface hardness for radiata pine, which is a southern material, and causes scratches due to pressing. In some cases, it could not be used as it is as a material for table tops, furniture, building materials, and the like. For this purpose, various measures have been taken to increase the hardness of the surface, but in particular, the solution by coating does not increase the cost, does not require special equipment, and is simple in construction. Had become.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to solve these problems, and as a result, have found that the central particle diameter is 30%.
The content of glass beads having a surface hardness of 50 to 150 parts by weight with respect to 100 parts by weight of the resin solid content of the coating material is obtained by using a soft material made of a South Sea material or a soft domestic material. Harden the surface of cedar,
It has been found that it has the effect of preventing press scratches. In particular, when the paint is a synthetic resin paint or a nitrified cotton lacquer paint, the effect is remarkable. Among the synthetic resin paints, a polyurethane paint and an ultraviolet-curable unsaturated polyester paint have remarkable effects. In addition, after the above paint is applied to wood, a paint containing no glass beads is applied, the coating is polished, and a paint containing no glass beads is further applied to the surface containing the glass beads to be overcoated. This is a method for applying a hardness-modified paint.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The paint in the present invention means all paints generally referred to as lacquer, natural resin varnish, aqueous paint, oil paint, cellulose paint, synthetic resin paint and the like. it can. In addition, as synthetic resins for paints, alkyd resins, unsaturated polyester resins, phenol resins, amino resins, epoxy resins, polyurethane resins, aldehyde resins, ketone resins, cumarone resins,
Maleic acid resin, vinyl acetate resin, vinyl chloride resin, acrylic resin, butyral resin, fluorine resin and the like can be mentioned. The resin used in the present invention is preferably a polyurethane resin or an ultraviolet-curable unsaturated polyester resin.
Although either of the liquid type can be used, the two-component type polyurethane coating material has a high surface hardness and is practically preferable. Examples of the cellulose derivative for coating include nitrocellulose, acetylcellulose and ethylcellulose. In particular, nitrocellulose is also referred to as nitrified cotton, and is preferable as the cellulose derivative for coating used in the present invention, and is used as a nitrified cotton lacquer coating.

The glass beads in the present invention are not particularly limited as long as they are glass beads, but glass beads for a filler are suitable for the purpose of the present invention. The center particle size is preferably from 30 to 60 μm, particularly preferably from 40 to 60 μm.
If the thickness is 50 μm, the effect of hardening the surface of a soft southern material and a soft domestic material to prevent a pressing scratch is remarkable. However, if it is less than 30 μm, the hardness of the wood cannot be improved, and the pressing scratch cannot always be prevented. On the other hand, if it exceeds 60 μm, the surface of the coating film becomes rough, and a smooth coating film surface cannot be obtained. In the present invention, the content of the glass beads in the paint is preferably 50 to 150 parts by weight based on 100 parts by weight of the resin solid content of the paint, and particularly preferably 140 to 150 parts by weight based on 100 parts by weight of the resin solid content of the paint. desirable. If the amount is less than 50 parts by weight with respect to 100 parts by weight of the resin solids, the desired hardness cannot be obtained, and the wood surface is soft and scratches are generated, so that it cannot be used for applications such as table tops, furniture, and building materials. Also, 150
Exceeding the weight part has the disadvantage that the coating film becomes slightly opaque and loses the woody feel. Here, the central particle size refers to the particle size at a position where the cumulative percentage is 50% on the particle size distribution diagram when the particle size distribution diagram of the glass beads is drawn.

[0007] The wood used in the present invention is not particularly limited in its species, but it is suitable for the purpose of the present invention to apply it to soft southern materials and soft domestic materials. For example, radiata pine of pine family, agathis of lynx family, yellow poplar of magnolia family,
Sesame Scrophulari Kiri, Coconoegiri, Thai Wangiri,
And cedars of the cedar family.

[0008]

EXAMPLES For the composition of paint other than glass beads, conventional abrasives, anti-sagging agents, coloring agents and surfactants can be used, and these can be blended, mixed, kneaded and used as paint. Can be. The surface hardness improving paint of the present invention is generally applied with an undercoat when applied to wood, but the undercoat is not always necessary. Next, when applying the paint of the present invention, it is desirable to apply the paint as a middle coat at least twice, then apply a paint containing no glass beads, polish the paint film, and finally finish with a top coat. , Can be used. Next, the present invention will be specifically described based on examples, but the gist of the present invention is not limited thereto.

Example 1 Veccosol 1308 manufactured by Dainippon Ink and Chemicals, Inc. as an alkyd resin polyol
60 parts by weight and 10 parts by weight of Becsol D-131-60 manufactured by Dainippon Ink and Chemicals, Inc.
Transferred to container. Thereafter, 10 parts by weight of xylene and 10 parts by weight of butyl acetate were weighed, placed in a container containing an alkyd resin polyol, and stirred well. Then, as an extender, talc (MICRON WHITE # 5 manufactured by Hayashi Kasei Co., Ltd.)
000 A) 10 parts by weight were added and stirred for 10 minutes. Thereafter, 100 parts by weight of glass beads (GB-301S manufactured by Toshiba Barotini) having a central particle diameter of 45 μm were mixed to prepare a main ingredient. Next, 14 parts by weight of Coronate L manufactured by Nippon Polyurethane Industry Co., Ltd. and 45 parts by weight of Coronate 2030 manufactured by Nippon Polyurethane Industry Co., Ltd. were weighed and transferred to a container as isocyanate prepolymers. Thereafter, 25 parts by weight of ethyl acetate and 16 parts by weight of butyl acetate were weighed, placed in a container containing an isocyanate prepolymer, and thoroughly stirred to obtain a curing agent. The main agent and curing agent are
Immediately before coating, the mixture was mixed at a weight ratio of 2: 1 to obtain a paint.

(Example 2) The amount of glass beads added was 70
A coating material was produced in the same manner as in Example 1 except that the amount was changed to parts by weight.

Example 3 The addition amount of glass beads was 40
A coating material was produced in the same manner as in Example 1 except that the amount was changed to parts by weight.

Example 4 A coating material was produced in the same manner as in Example 1 except that 100 parts by weight of glass beads (GB-731-1 manufactured by Toshiba Barotini) having a center particle diameter of 30 μm were mixed.

Comparative Example 1 A coating material was produced in the same manner as in Example 1 except that no glass beads were added.

Comparative Example 2 A coating material was produced in the same manner as in Example 1 except that 100 parts by weight of glass beads having a center particle diameter of 18 μm (GB-731-M-1 manufactured by Toshiba Barotini) were mixed.

Comparative Example 3 A coating material was produced in the same manner as in Example 1 except that 100 parts by weight of a glass powder having a center particle size of 25 μm (P325 manufactured by Toshiba Barotini) was mixed.

(Example 5) As an ultraviolet-curable unsaturated polyester resin, 30 parts by weight of Goseirac 180 manufactured by Nippon Synthetic Chemical Industry Co., Ltd. and 25 parts by weight of Gooserac 181 manufactured by Nippon Synthetic Chemical Industry were weighed and transferred to a container. . Thereafter, 6 parts by weight of methyl ethyl ketone and 25 parts of styrene monomer 25
The parts by weight were weighed, placed in a container containing an ultraviolet-curable unsaturated polyester resin, and stirred well. Next, 3 parts by weight of zinc stearate (Zinc Stearate ZF, manufactured by Seido Chemical Co., Ltd.) as an abrasive and 8 parts by weight of talc (TALCAN PAWDER PK, manufactured by Hayashi Kasei Co., Ltd.) as an extender were added.
Stirred for 10 minutes. Thereafter, 3 parts by weight of a photopolymerization initiator (Irgacure 651 manufactured by Nippon Ciba Geigy Co., Ltd.) was added, and the mixture was thoroughly stirred and dissolved. After that, 50 parts by weight of glass beads (GB-301S manufactured by Toshiba Barotini) having a central particle diameter of 45 μm were added. It was put in well, stirred well and used as a paint.

Comparative Example 4 A coating material was produced in the same manner as in Example 5 except that no glass beads were added.

Example 6 As a solvent, 35 parts by weight of toluene, 5 parts by weight of ethyl acetate, 10 parts by weight of butyl acetate, M
6 parts by weight of IBK and 5 parts by weight of isobutanol were weighed, placed in a container, and stirred. Add 16 parts by weight of nitrifying cotton (1 / 4NC (HIG) manufactured by Asahi Kasei Corporation) to the solvent and add
Stirred for minutes. After confirming that the nitrified cotton was completely dissolved, 23 parts by weight of a maleic acid resin (Marquid # 8 manufactured by Arakawa Chemical Industry Co., Ltd.) was added while stirring the solution,
Dissolved. Next, 50 parts by weight of glass beads (GB-301S manufactured by Toshiba Palotini Co., Ltd.) having a center particle diameter of 45 μm were added, and the mixture was stirred well and used as a paint.

Comparative Example 5 A coating material was produced in the same manner as in Example 5 except that no glass beads were added.

(Test Example 1) The paints produced in Examples 1 to 4 and the paints produced in Comparative Examples 1 to 3 were applied on a radiator pine material by the steps shown in Table 1. That is, first, a two-component polyurethane undercoat (Best Sealer manufactured by Sanyu Paint Co., Ltd.) is applied on the radiator pine material, and the intermediate coat of Examples 1-4 or Comparative Examples 1-3 is applied twice thereon. Was. In addition, two
A liquid-type polyurethane intermediate paint (Rose Sanding, Sanyu Paint Co., Ltd.) was applied and polished with # 400 sandpaper, and then a two-component polyurethane topcoat (Best Flat, Sanyu Paint Co., Ltd.) was applied. FIG. 1 shows a cross-sectional view of the coating film. According to JIS Z-2101, the hardness of the coating film was measured at five measurement points by placing a steel ball having a diameter of 10 mm on the test surface at a depth of 1 / π mm (approximately 0.1 mm).
Up to 32 mm) at an average press-in speed of about 0.5 mm / min. In addition, the measurement by the pressing scratch method using a claw was also performed. Table 2 shows the results. As can be seen from Table 2, when the center particle size of the glass beads of the examples is 30 μm or more, and when the content of the glass beads is 50
When the amount was more than the weight part, the surface hardness was sufficiently hard, and a coated surface that could be used practically was obtained. On the other hand, in Comparative Examples having other coating compositions, a coated surface having a required hardness could not be obtained.

[0021]

[Formula 1] H = P / 10 H: Hardness (kgf / mm ² ) P: Load (kgf) when the press-fit depth becomes 1 / πmm

[0022]

[Table 1]

[0023]

[Table 2]

Test Example 2 The paint prepared in Example 5 and the paint prepared in Comparative Example 4 were applied on a radiator pine material in accordance with the steps shown in Table 3. That is,
The intermediate coating of Example 5 or Comparative Example 4 was applied twice on the radiator pine material. Furthermore, an ultraviolet-curable intermediate coating (Rabin R- manufactured by Sanyu Paint Co., Ltd.)
1300) and polished with # 400 sandpaper, and then an ultraviolet-curable top coat (Rabin R-1950 manufactured by Sanyu Paint Co., Ltd.) was applied. The hardness of the coating film was measured in the same manner as in Test Example 1 by a hardness test according to JIS Z-2101 and a pressing scratch method using a claw, and the results are shown in Table 4. As can be seen from Table 4, when the center particle diameter of the glass beads of the example is 45 μm and the content of the glass beads is 50 parts by weight, the surface hardness is sufficiently hard and a coated surface that can withstand practical use is obtained. Was done. On the other hand, in the comparative example containing no glass beads, a painted surface having the required hardness could not be obtained.

[0025]

[Table 3]

[0026]

[Table 4]

(Test Example 3) The paint prepared in Example 6 and the paint prepared in Comparative Example 5 were applied on a radiator pine material by the steps shown in Table 5. That is,
The intermediate paint of Example 6 or Comparative Example 5 was applied twice on the radiator pine material. Furthermore, a nitrified cotton lacquer intermediate coating (# 11 lacquer sanding manufactured by Sanyu Paint Co., Ltd.) is applied thereon, and polished with sandpaper # 400. Line).
The hardness of the coating film was measured according to JIS Z-210 in the same manner as in Test Example 1.
The hardness was measured according to the hardness test according to No. 1 and the pressing scratch method using a claw, and the results are shown in Table 6. As can be seen from Table 6, the center particle size of the glass beads of the example was 45 μm,
And when the content of glass beads is 50 parts by weight,
The surface hardness was sufficiently hard, and a painted surface that could withstand practical use was obtained. On the other hand, in the comparative example containing no glass beads, a painted surface having the required hardness could not be obtained.

[0028]

[Table 5]

[0029]

[Table 6]

[0030]

According to the present invention, the center diameter of the glass beads is 30 to 60 μm.
m, the content thereof is 50 to 150 parts by weight with respect to 100 parts by weight of the resin solid content of the paint. Hardness can be increased. In particular, recently, the import of soft southern materials has increased, and the use of soft domestic materials has increased. For example, for radiata pine, etc., conventional two-pack polyurethane paints and UV-curable unsaturated polyester In the case of coating with a paint, a nitrifying cotton lacquer paint, or the like, the hardness of the surface is not sufficiently obtained, and a pressing scratch may occur. Therefore, it cannot be used as it is as a material for table tops, furniture, building materials and the like. However, since the surface hardness improving paint of the present invention has the effect of hardening its surface and preventing pressing scratches by applying to such southern materials and domestic materials, it is used for table tops, furniture, building materials and the like. Can now be used. In particular, after the above paint is applied to wood, a paint containing no glass beads is applied, the coating is polished, and a paint containing no glass beads is further applied to the surface containing the glass beads to be overcoated. According to the method of applying the hardness-modified paint, even a southern material with a soft material and a domestic material with a soft material can be finished to the same surface hardness as other wood.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a coating film made of a two-component polyurethane paint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cross section of the coating film by two-component polyurethane paint 2 Substrate (wood part) 3 Two-component polyurethane undercoat 4 Glass-bead-containing two-component polyurethane intermediate paint 5 Glass-bead-containing two-component polyurethane intermediate paint 6 Two-component polyurethane Polyurethane intermediate paint 7 Polished surface 8 Two-component polyurethane top paint 9 Coating surface

Claims (6)

[Claims] 1. A surface-hardened coating composition characterized in that the content of glass beads having a center particle size of 30 to 60 μm is 50 to 150 parts by weight based on 100 parts by weight of resin solid content of the coating composition. . 2. The surface hardness improving paint according to claim 1, wherein the paint is a synthetic resin paint. 3. The surface hardness improving paint according to claim 1, wherein the synthetic resin paint is a polyurethane resin. 4. The surface hardness improving paint according to claim 1, wherein the synthetic resin paint is an ultraviolet-curable unsaturated polyester resin. 5. The paint according to claim 1, wherein the paint is a nitrified cotton lacquer paint.
The surface hardness improving paint according to the above. 6. After applying the surface hardness improving paint according to any one of claims 1 to 5 to wood, a paint containing no glass beads is applied, and the coating is polished. A method for applying a surface hardness improving paint containing glass beads, which comprises overcoating a paint containing no.