JP3399485B2 - Heat melting type road marking paint - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-melt type road marking paint used for marking various roads on concrete and asphalt road surfaces. 2. Description of the Related Art Conventionally, a hot-melt type road marking paint contains a binder resin such as a petroleum resin, a pigment such as titanium oxide, a filler such as calcium carbonate, and the like, and glass beads mixed therein. Have been. In addition, glass beads are generally mixed in an amount of about 15 to 18% by weight with respect to the entire coating material, protrude from the surface of the coating film applied on the road surface, and use the retroreflectivity to enhance the visibility at night. However, in such a conventional hot-melt road marking paint, the amount of glass beads mixed is as low as 15 to 18% by weight. As a result, there is almost no glass beads protruding from the surface of the coating film, resulting in a problem that nighttime visibility is remarkably reduced. In addition, paints are simply blended with binder resin, pigments, fillers, etc., and are not particularly abrasion-resistant, so that on roads with heavy traffic, the wear of the paint film progresses quickly, and the above-mentioned nighttime visibility is high. There is a problem that the property cannot be maintained for a long time. [0004] It is an object of the present invention to provide a heat melting type road marking paint which has solved the above-mentioned conventional problems. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a conventional heat-melting type road marking paint, which is used for a polystyrene-polyisoprene block copolymer resin or a polystyrene-polybutadiene block copolymer resin. By mixing a predetermined amount of these mixed resins or the adhesive resin of the amorphous polyalphaolefin resin, the adhesion between the materials of the coating material is increased to impart flexibility and enhance the impact resistance,
By improving the abrasion resistance and further increasing the amount of glass beads mixed, the visibility at night, in particular, the visibility at the time of wear is improved. That is, the hot-melt road marking paint of the present invention is a hot-melt road marking paint comprising a binder resin, a pigment, a filler, etc.
20% by weight, the adhesive resin is blended in an amount of 1 to 15% by weight based on the whole paint, and the glass beads are mixed in an amount of 30 to 60% by weight based on the whole paint. It is a polystyrene-polyisoprene block copolymer resin, a polystyrene-polybutadiene block copolymer resin, a mixed resin thereof, or an amorphous polyalphaolefin resin. As the binder resin to be blended in the present invention, conventional ones may be used. Generally, a petroleum resin is used, but a thermoplastic resin such as raw rosin, maleated rosin, maleated rosin ester, polyamide resin, unsaturated polyester resin, xylene resin and the like may be used. The compounding ratio of the binder resin is 10 to 2 with respect to the whole paint.
0% by weight. When the content is less than 10% by weight, the fluidity and adhesiveness of the paint are inferior. When the content is more than 20% by weight, the stain resistance of the coating film is poor. Conventional pigments such as white pigments such as titanium dioxide, zinc white and lithopone, and yellow pigments such as graphite and titanium yellow are used as the pigment. The mixing ratio of the pigment is preferably from 2 to 10% by weight based on the whole paint. If the compounding ratio is less than 2% by weight, the coloring power and the hiding power are small, and
If the amount is more than 2% by weight, the effect is not improved any more and only the cost is increased. As the filler, calcium carbonate, silica sand,
Conventional general-purpose materials such as cold water sand and talc are used. The compounding ratio of the filler is preferably from 30 to 50% by weight based on the whole paint. When the compounding ratio is less than 30% by weight, the stain resistance and abrasion resistance of the coating film are inferior. The pressure-sensitive adhesive resin blended in the present invention is used for improving the adhesion between coating materials by the adhesive force, imparting flexibility to the coating film, and improving impact resistance. A styrene-based block copolymer resin composed of a polystyrene-polyisoprene block copolymer resin, a polystyrene-polybutadiene block copolymer resin, or a mixed resin thereof, or an amorphous polyalphaolefin resin is preferably used. The styrene block copolymer resin of the polystyrene-polyisoprene block copolymer resin and the polystyrene-polybutadiene block copolymer resin is a thermoplastic elastomer having an adhesive property and a low melt viscosity. Since the melt viscosity is low, the workability of the paint by the hot melt method is good, and there is an advantage that the softening point of the paint can be maintained as it is despite the low melt viscosity. Further, the polystyrene-polyisoprene block copolymer resin and the polystyrene-polybutadiene block copolymer resin may be mixed in an appropriate ratio, and can be suitably used without impairing the above properties. The amorphous polyalphaolefin resin is a resin having a relatively low molecular weight obtained by copolymerizing propylene with ethylene or brene-1. Generally, it can be used alone as a hot-melt adhesive or sealing agent, and has excellent adhesiveness and compatibility with binder resins, especially petroleum resins. To enhance the impact resistance. The compounding ratio of the adhesive resin is preferably 1 to 15% by weight based on the whole coating composition. If the compounding ratio is less than 1% by weight, sufficient abrasion resistance cannot be obtained in the coating film, and if it is more than 15% by weight, the fluidity of the coating material is deteriorated, the workability is poor, and the edge of the coating film is disordered. 1 to 1
5% by weight is preferred. In particular, when the content exceeds 2% by weight, the fluidity gradually deteriorates, the workability decreases, and it is difficult to obtain a good sign, so that the content is preferably 1 to 2% by weight. The amount of glass beads to be mixed is preferably 30 to 60% by weight based on the whole paint. This mixing amount is 30
If it is less than 60% by weight, the reflection brightness at the time of abrasion of the coating film is insufficient and the night visibility is inferior, and if it is more than 60% by weight, the cost is high and the formation of the coating film is hindered. In particular, 40 to 50% by weight is more preferable from the viewpoint of securing a sufficient reflection luminance at the time of abrasion of the coating film and favorable construction and formation of the coating film. Further, as the glass beads, those having a particle diameter of 60 to 710 μm and a refractive index of 1.5 or more are usually used. Particularly, when high-intensity glass beads are used, night visibility is further improved, which is preferable. In the present invention, besides the above, an antioxidant or a wax as an anti-settling agent, or a plasticizer such as a vegetable oil, a vegetable oil-modified alkyd resin, a phthalic acid ester, or the like is added in an appropriate amount as needed. May be done. Embodiments of the present invention will be described below. It consists of binder resin (petroleum resin), pigment (titanium oxide), filler (calcium carbonate), glass beads, and additives (wax, plasticizer). Using paints (No. 1 to No. 3), these paints are each melted at a temperature of about 200 ° C. and uniformly applied on 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. The surface of the coating film is uniformly abraded for about 1 minute by using a Plasshot TSP60 manufactured by Toshiba Barotini Co., Ltd. with an ascon blast cabinet BA-1 type direct pressure type machine (manufactured by Atsushi Tekko Co., Ltd.). The reflection luminance at arbitrary 10 points was measured by a luminance measuring device between the time and the wet time, and the results are shown in Table 2. In the abrasion test, a resin powder was used as sandblast to reproduce the abrasion caused by the tire, and the abrasion was uniformly performed without destruction of the glass beads. [Table 1] [Table 2] From Tables 1 and 2, it was confirmed that the reflection luminance value after abrasion was sequentially increased as the amount of glass beads mixed increased. Next, in particular, No.
Based on the paint No. 3, the wear resistance of the coating film was examined by blending a polystyrene-polyisoprene block copolymer resin, a polystyrene-polybutadiene block copolymer resin, and an amorphous polyalphaolefin resin with an adhesive resin. It comprises a binder resin (petroleum resin), a pigment (titanium oxide), a filler (calcium carbonate), glass beads, and additives (wax, plasticizer), and a polystyrene-polyisoprene block copolymer resin (SIS). ) (Quintac 3421 manufactured by Zeon Corporation) with four kinds of paints shown in Table 3 (Examples 1 to 3 and Comparative Example 2) and a paint not containing a polystyrene-polyisoprene block copolymer resin (comparative) Using Example 1), each of these paints was melted at a temperature of about 200 ° C., and JIS K 5665 3
The test was carried out according to various kinds of abrasion resistance test methods, and the results (wear loss) are shown in Table 3. [Table 3] It is composed of a binder resin (petroleum resin), a pigment (titanium oxide), a filler (calcium carbonate), glass beads, and additives (wax, plasticizer), and a polystyrene-polybutadiene block copolymer resin (SBS). Four types of paints shown in Table 4 (Examples 4 to 6, Comparative Example 3) in which the amount of (Quintac BL-301 manufactured by Zeon Corporation) was changed.
Table 4 shows the same test results as above using a paint (Comparative Example 1) containing no polystyrene-polybutadiene block copolymer resin. [Table 4] It comprises a binder resin (petroleum resin), a pigment (titanium oxide), a filler (calcium carbonate), glass beads, and additives (wax, plasticizer), and an amorphous polyalphaolefin resin (APAO). (Ube Tack UT2585 manufactured by Ube Lexen Co., Ltd.) The four types of paints shown in Table 5 (Examples 7 to 9 and Comparative Example 4) in which the blending amount was changed, and a paint not containing an amorphous polyalphaolefin resin (Comparative Example 1)
And the test results similar to the above were shown in Table 5. [Table 5] As can be seen from Tables 3 to 5, it was confirmed that the weight loss was large in Comparative Examples 1 to 4 and small in Examples 1 to 9. Also, polystyrene-
In Examples 3, 6, and 9 in which the blending amounts of the polyisoprene block copolymer resin, the polystyrene-polybutadiene block copolymer resin, and the amorphous polyalphaolefin resin were 2% by weight, respectively, In comparison, the fluidity of the paint was slightly lowered, and the surface of the coating film had a little sticky feeling. As described in detail above, the hot-melt road marking paint of the present invention is a polystyrene-polyisoprene block copolymer resin, a polystyrene-polybutadiene block copolymer resin, a mixed resin thereof, or an amorphous poly- ylene resin. Adhesive resin of alpha olefin resin is 1 to the whole paint
-15% by weight, it is possible to improve the abrasion resistance of the coating film formed on the road surface as compared with the related art. Further, glass beads are contained in 30% of the total paint.
６０60% by weight, the glass beads are difficult to peel off from the coating film in combination with the above-mentioned adhesive resin, and the night visibility can be improved.
In addition, even if the coating film is slightly peeled off, the visibility at night can be maintained in a good state, and its reflection performance can be maintained over a long period of time.

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Claims (1)

(57) [Claim 1] In a hot-melt type road marking paint comprising a binder resin, a pigment, a filler and the like, the binder resin is blended in an amount of 10 to 20% by weight based on the whole paint, The adhesive resin is blended in an amount of 1 to 15% by weight based on the entire coating composition, glass beads are mixed in an amount of 30 to 60% by weight based on the entire coating composition, and the adhesive resin is a polystyrene-polyisoprene block. A heat melting type road marking paint which is a polymer resin, a polystyrene-polybutadiene block copolymer resin, a mixed resin thereof, or an amorphous polyalphaolefin resin.