JPH07179787A - Hot-melt road-marking paint - Google Patents

Abstract

PURPOSE:To obtain a hot-melt road-marking paint having high abrasion resistance and capable of keeping the visibility at night over a long period. CONSTITUTION:This paint is a hot-melt road-marking paint composed of a binder resin such as petroleum resin, a pigment, a filler and glass beads, etc., and containing 1-15wt.% (based on the total resin) of an ethylene-vinyl acetate copolymer resin for improving the abrasion resistance and 30-60wt.% of glass beads for improving the visibility at night.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat melting type road marking paint used for various road markings on concrete, asphalt road surface and the like.

[0002]

2. Description of the Related Art Conventionally, a heat-melting type road marking paint has a binder resin such as petroleum resin, a pigment such as titanium oxide, a filler such as calcium carbonate, and glass beads mixed therein. . Further, glass beads are generally mixed in an amount of about 15 to 18% by weight with respect to the entire coating material, and the glass beads are projected on the surface of the coating film applied to the road surface to utilize their retroreflectivity to enhance nighttime visibility.

[0003]

However, in such a conventional heating and melting type road marking paint, since the content of glass beads is as low as 15 to 18% by weight, when the coating film applied to the road surface is abraded by the passage of vehicles, However, there is a problem that the glass beads protruding on the surface of the coating film are almost eliminated and the visibility at night is significantly reduced. In addition, the paint is simply a binder resin mixed with pigments, fillers, etc., and is not particularly wear resistant, and the wear of the paint film progresses rapidly on roads with heavy traffic. There was a problem that the sex could not be maintained for a long time.

It is an object of the present invention to provide a heating and melting type road marking paint which solves the above conventional problems.

[0005]

In order to solve the above-mentioned problems, the present invention provides a conventional general-purpose heat-melting type road marking paint by blending a predetermined amount of an ethylene-vinyl acetate copolymer resin having adhesiveness. By increasing the adhesiveness between paint substances to give flexibility to improve impact resistance and contribute to abrasion resistance, and by increasing the amount of glass beads mixed, visibility at night, especially during abrasion It has improved visibility.

That is, the heat-melting road marking paint of the present invention is a heat-melting road marking paint comprising a binder resin, a pigment, a filler, etc., wherein the ethylene-vinyl acetate copolymer resin is 1 to 15 relative to the entire paint. The glass beads are mixed in an amount of 30% by weight, and the glass beads are mixed in an amount of 30 to 60% by weight with respect to the entire coating material.

As the binder resin to be blended in the present invention, those conventionally used in general may be used. Generally, petroleum resins are used, but thermoplastic resins such as raw rosin, maleinized rosin, maleinized rosin ester, polyamide resin, unsaturated polyester resin, and xylene resin may be used. The compounding ratio of the binder resin is 10 to 2 with respect to the entire paint.
0% by weight is preferred. If the blending ratio is 10% by weight or less, the fluidity and adhesiveness of the coating material will be poor, and if it is 20% by weight or more, the stain resistance of the coating film will be poor, so 10 to 20% by weight is preferable.

As the pigment, conventionally used pigments such as white pigments such as titanium dioxide, zinc white and lithopone, and yellow pigments such as yellow lead and titanium yellow are used. The mixing ratio of the pigment is preferably 2 to 10% by weight with respect to the entire coating material. When the blending ratio is 2% by weight or less, the coloring power and the hiding power are small and 10
Even if the amount is more than 10% by weight, the effect is not further improved and only the cost is increased, so 2 to 10% by weight is preferable.

As the filler, calcium carbonate, silica sand,
Conventionally used materials such as cold water sand and talc are used. The blending ratio of the filler is preferably 30 to 50% by weight with respect to the entire paint. If the blending ratio is 30% by weight or less, the stain resistance and abrasion resistance of the coating film will be poor, and if it is 50% by weight or more, the adhesiveness of the coating film will be deteriorated and cracks will occur.

The ethylene-vinyl acetate copolymer resin blended in the present invention is for improving the adhesion between the substances of the coating material by its adhesive force and imparting flexibility to the coating film to enhance the impact resistance. In terms of adhesion and coating hardness, a vinyl acetate content of about 30% by weight is usually used. The blending ratio of the ethylene-vinyl acetate copolymer resin is preferably 1 to 15% by weight based on the whole coating material. If the blending ratio is less than 1% by weight, sufficient abrasion resistance cannot be obtained for the coating film, and if it is more than 15% by weight, the fluidity of the coating composition is poor and the workability is poor, and the marking of the coating film with rough edges is shown. Since it cannot be obtained, 1 to 15% by weight is preferable. Especially 2% by weight
If it exceeds, the fluidity will gradually deteriorate and the workability will decrease,
1 to 2% by weight is more preferable because it is difficult to obtain a good marking.

Further, the amount of the glass beads mixed is preferably 30 to 60% by weight with respect to the entire paint. This mixing amount is 30
If it is less than 50% by weight, the reflection brightness when the coating film is worn is insufficient and the night visibility is poor, and if it is more than 60% by weight, the cost becomes high and the coating film formation is hindered. In particular, 40 to 50% by weight is more preferable from the viewpoint of ensuring a sufficient reflection brightness when the coating film is worn and good in construction and coating film formation. Further, as the glass beads, those having a particle size of 60 to 710 μm and a refractive index of 1.5 or more are usually used, and particularly when the high brightness glass beads are used, night visibility is further improved, which is preferable.

In the present invention, in addition to the above, an antioxidant or an anti-settling agent wax, a vegetable oil, a vegetable oil-modified alkyd resin, a plasticizer such as a phthalate ester, etc. are added in an appropriate amount in addition to the above. May be done.

[0013]

EXAMPLES Examples of the present invention will be described below. It consists of binder resin (petroleum resin), pigment (titanium oxide), filler (calcium carbonate), glass beads, additives (wax, plasticizer). Using paints (No. 1 to No. 3), each of these paints was melted at a temperature of about 200 ° C. and uniformly applied onto an aluminum plate to form a coating film having a width of 15 cm, a length of 50 cm and a thickness of 2.0 mm. Formed.

An Ascon Blast Cabinet BA-1 type direct pressure machine (manufactured by Atsuko Tekko Co., Ltd.) was used to uniformly wear the surface of the coating film for about 1 minute using Plashot TSP60 manufactured by Toshiba Ballotini Co., Ltd., and the coating film was dried after the abrasion. The reflection luminance at 10 arbitrary points was measured by a luminance measuring device with respect to time and wet, and the results are shown in Table 2. In the above abrasion test, resin powder was used as sandblast to reproduce the abrasion by the tire, and the glass beads were evenly abraded without breaking.

[0015]

[Table 1]

[0016]

[Table 2]

From Tables 1 and 2, it was confirmed that the reflection luminance value after abrasion was successively increased as the amount of glass beads mixed was increased. Next, especially in No.
The abrasion resistance of the coating film prepared by blending the ethylene-vinyl acetate copolymer resin was examined based on the paint of No. 3 as a base.

It comprises a binder resin (petroleum resin), a pigment (titanium oxide), a filler (calcium carbonate), glass beads, an additive (wax, plasticizer), and an ethylene-vinyl acetate copolymer resin (EVA). Five kinds of paints (Examples 1 to 3 and Comparative examples 1 and 2) shown in Table 3 in which the compounding amount of (Evaflex 220 manufactured by Mitsui Petrochemical Co., Ltd.) was changed were used, and these paints were each heated at a temperature of about 190 ° C. Melted, JIS K
5665 Tested according to 3 types of abrasion resistance test methods,
The results (loss of wear) are shown in Table 3.

[0019]

[Table 3]

As can be seen from Table 3, it was confirmed that the abrasion loss was large in Comparative Examples 1 and 2, and the abrasion loss was small in Examples 1 to 3. Further, in Example 3 in which the blending amount of the ethylene-vinyl acetate copolymer resin was 2% by weight, the fluidity of the paint was lower than in Examples 1 and 2, and the coating film surface had a slight stickiness.

[0021]

As described in detail above, in the heat melting type road marking paint of the present invention, the ethylene-vinyl acetate copolymer resin is blended in an amount of 1 to 15% by weight with respect to the entire paint, and the glass beads are included in the entire paint. Since it is mixed in 30 to 60% by weight, it is possible to improve the wear resistance of the coating film formed by coating on the road surface as compared with the conventional one, and improve the night visibility at the time of wear, and reflect it for a long time. Performance can be maintained.

Claims (1)

[Claims] 1. A heat melting type road marking paint comprising a binder resin, a pigment, a filler and the like, wherein an ethylene-vinyl acetate copolymer resin is blended in an amount of 1 to 15% by weight with respect to the entire paint.
A heat melting type road marking paint in which glass beads are mixed in an amount of 30 to 60% by weight based on the whole paint.