JPH10316889A - Heat melting and adhering coating for road traffic sign - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat melting and adhering coating for road traffic signs capable of shortening time for traffic controls and excellent in adhesiveness, workability and stain resistance by containing a specific ratio of a binding resin and a specific amorphous poly α-olefin. SOLUTION: This heat melting and adhering coating for road traffic signs comprises a binding resin such as rosin resin, etc., a plasticizer, a pigment, a reflective material, a filler, etc., and 100 pts.wt. of the binding resin contains 2-30 pts.wt. of an amorphous poly α-olefin consisting of polypropylene or a copolymer of propylene with ethylene or butene-1 and having 500-20000 number average molecular weight and 400-15000 cPs melt viscosity at 190 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat welding type road marking paint.

[0002]

2. Description of the Related Art Conventionally, when applying a heat melting type road marking paint, it is usual to improve the adhesive strength by applying a treatment material to an adhered surface. If no treatment material is used, peeling often occurs, which causes a serious defect. Commonly used treating agents include tackifiers, such as rosin, petroleum resins, thermoplastic resins such as xylene resins, ethylene-vinyl acetate copolymer resins as cohesion enhancers, and polystyrene-polyisoprene-polystyrene block copolymers. A mixture of a rubber elastic substance and a plasticizer such as vegetable oil, vegetable oil-modified alkyd resin, and phthalates dissolved in a flammable solvent such as toluene, xylol, and acetone (flammable in a nonflammable solvent such as trichlene and methylene chloride) In some cases, such a treating agent is applied before applying the hot-melt type road marking paint to improve the adhesiveness.

However, when applying a treating agent, 5 to 20
It requires a drying time of one minute, and it is necessary to take a different action from the application of the heat-melting road marking paint or to limit the application range,
Traffic regulation will be longer. Therefore, the development of a hot-melt type road marking paint that does not require a treating agent has been developed, and Japanese Patent Application Laid-Open Nos. Sho 62-7770, Hei 3-2281, and Hei 7-113054 have become publicly known. I have.

A road marking material disclosed in Japanese Patent Application Laid-Open No. Sho 62-7770, comprising 3 to 50 parts of an ethylene-vinyl acetate copolymer resin per 100 parts of a binder resin.
No. 2281, mainly comprising isobutylene,
A copolymer resin partially reacted with n-butene and having a molecular weight of 200
To 4000 polyisobutylene copolymer resin as binder resin 1
There is known a heat melting type road marking material obtained by mixing 3 to 50 parts by weight with respect to 00 parts by weight. JP-A-7-1
No. 13054 discloses an acid-modified aliphatic hydrocarbon resin having a saponification value of 16 to 50 as a binder resin and an elasticity-imparting material as a coating material which can be applied onto an existing road marking body without requiring a treating agent. And a resin are disclosed.

[0005]

However, in the above-mentioned prior art, those disclosed in Japanese Patent Application Laid-Open Nos. 62-7769 and 3-2281 consume a new sign or a curtain thickness of less than 1 mm. In the case of application on the existing marking line that has been applied, it shows good adhesion, but when applying thinly on the existing marking line that has been worn out, or on a relatively new marking body one week to one month after application There were problems that the adhesiveness was poor and that sufficient adhesiveness could not be secured for repairing a part of the sign that was peeled or damaged. Also, Japanese Patent Application Laid-Open No. 7-113
Japanese Unexamined Patent Publication No. 054 discloses an attempt to solve the above problem by using a special binder resin having a specified saponification value. However, since the resin used is specified, the degree of freedom is limited. There was a problem.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems by providing a heat welding type road marking paint comprising a binder resin, a plasticizer, a pigment, a reflector, a filler and the like. It is characterized in that propylene alone or 2 to 30 parts by weight of an amorphous poly-alpha-olefin obtained by copolymerizing propylene and ethylene or butene-1 is contained with respect to 100 parts by weight of the resin.

The number average molecular weight of propylene alone or a non-crystalline poly-alpha-olefin obtained by copolymerizing propylene with ethylene or butene-1 is 500 to 2
It is characterized by being set to 000 (preferably 4,000 to 10,000).

Further, the melt viscosity at 190 ° C. is 400
A non-crystalline poly-alpha-olefin obtained by copolymerizing propylene alone or propylene with ethylene or butene-1 having a molecular weight of up to 15,000 cps.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As the binder resin used in the present invention, rosin resin, petroleum resin (aliphatic hydrocarbon resin, alicyclic hydrocarbon resin) and hydrogenated resin thereof, terpene resin and hydrogenated resin thereof Resins, saturated polyester resins and the like can be used alone or in combination of two or more. The compounding amount of the binder resin is preferably 10 to 20 parts by weight based on 100 parts by weight of the heat welding type road marking paint of the present invention. If the amount is less than 10 parts by weight, the melt viscosity as a road marking paint is high, the fluidity and workability are poor, and the adhesiveness is poor. 20
If the amount exceeds the weight part, tire marks and dust are apt to adhere, and the stain resistance is reduced. Further, the fluidity is good, but the working temperature is lowered, and the adhesiveness is also lowered.

As the plasticizer, vegetable oil, vegetable oil-modified alkyd resin, mineral oil, phthalic acid ester, liquid synthetic rubber and the like can be used alone or in combination of two or more. The amount of the plasticizer is preferably 1 to 5 parts by weight based on 100 parts by weight of the heat welding type road marking paint of the present invention. 1
If the amount is less than 5 parts by weight, the adhesiveness and impact resistance will be poor, and if it exceeds 5 parts by weight, the stain resistance and drying property will be inferior.

As the color pigment, a white pigment such as titanium dioxide and zinc white, and a yellow pigment such as yellow (heat-resistant graphite), a yellow organic pigment and titanium yellow are mainly used. The compounding amount of the coloring pigment is preferably 1 to 10 parts by weight in 100 parts by weight of the heat welding type road marking paint of the present invention, and the coloring power is less than 1 part by weight,
Poor hiding power visibility and weather resistance are poor. Even if it exceeds 10 parts by weight, there is no great difference in visibility and the cost is greatly increased, so that it is not practical.

As the reflecting material, glass beads of No. 1 of JIS R. 3301 are mainly blended, and as other glass beads, large-diameter beads, high-refractive beads, plastic beads or the like can be used alone or in combination of two or more kinds. Can be used. The amount of the glass beads is 15 to 35 parts by weight based on 100 parts by weight of the heat welding type road marking paint of the present invention. Inorganic fillers such as calcium carbonate, silica stone, cold water stone, glass powder, and alumina can be used alone or in combination of two or more as fillers and aggregates. The amount of the filler and the aggregate is preferably 35 to 65 parts by weight based on 100 parts by weight of the heat welding type road marking paint of the present invention. If the amount is less than 35 parts by weight, abrasion resistance and stain resistance are poor.
On the other hand, if it exceeds 65 parts by weight, impact resistance and adhesiveness will be poor. In addition, anti-settling agents as auxiliary additives,
An antioxidant, a stain inhibitor and the like may be used. In the present invention, the above components are mixed, heated and melted before use.

[0013]

Examples Examples and comparative examples of the present invention are shown in Table 1 below.
The present invention will be described based on Table 2 and FIGS. 1A to 1E, but the present invention is not limited to this. In the examples, “parts” means “parts by weight” unless otherwise specified.

FIG. 1A is a diagram showing low-temperature adhesiveness of asphalt surface (in the case of 1.5 mm thickness), and FIG. 1B is a diagram showing low-temperature adhesiveness of concrete surface (in the case of 1.5 mm thickness);
FIG. 3C shows the low-temperature adhesiveness of the paint surface (in the case of 1 mm thickness), FIG. 2D shows the low-temperature adhesiveness of the paint surface (in the case of 1.5 mm thickness), and FIG. Melt viscosity (sec / 185
FIG. In FIGS. 1 (a) to 1 (e), the examples actually represent the examples and the ratios represent the comparative examples.

Test method (1) Softening point, compressive strength According to JIS-K-5665. (2) Low-temperature adhesion test Attachment (disk) of 4 cm square and 1 cm thick at 0 ° C was attached to the coating surface with an epoxy adhesive, and a Kenken-type adhesive peel tester (Marubishi Scientific Machinery Co., Ltd.)・ Catalog MKS bond adhesion peeling tester MODEL
BA-400). Number of samples (disks) n
= 5 (1.5 mm thick coating film, which is considered to be the hardest to adhere to the coated paint surface, is exposed for 3 weeks and an additional 1 m
m, a paint surface without spraying glass beads applied to a thickness of 1.5 mm was used. (3) Low-temperature impact resistance A paint (10 to 15 g) at 185 ° C. was poured onto each adhesive surface so as to have a diameter of 3 to 5 cm, and this was cooled to 0 ° C. ) Is placed at the end of the paint, and is peeled off by impact with a hammer, and the adhesion state of the peeled surface is determined. Sample Number of commercially available test blocks n = 5 (a 1.5 mm thick coating film, which is considered to be the least adherent to the applied paint surface, was exposed for 3 weeks and further 1 mm, 1.5 m
A painted surface without spraying glass beads applied to a thickness of m was used. (4) Stain resistance On the actual road surface, the stripes of the pedestrian crossing were divided into halves, and conventional products and test materials were alternately applied to compare the stain conditions. (5) Low-temperature crack resistance The compressive strength at 0 ° C. and the breaking state are compared. (JI
According to SK-5665. (6) Melt viscosity As shown in FIG. 2, it is made of iron with a thickness of 2 mm and the upper hole diameter is 40 m.
m, a height of 20 mm, a bottom part of a cone having a hole diameter of 10 mm, a handle attached to a boar-shaped measuring part having a cylindrical part 5 mm with a hole diameter of 10 mm at the bottom, and a viscosity measuring instrument was put into the molten paint and scooped up. It is measured by the time until the paint flows out from the bottom of the cylindrical part while being held horizontally and the paint is cut off at the center of the conical body to form a hole.

Based on the above Tables 1 and 2, focusing on the low-temperature adhesiveness when applied to the asphalt surface, the stable adhesive force is in the same range as Comparative Example 1 which has been conventionally used, and has a small variation. Is obtained. Comparative Example 2 is Comparative Example 1 in which the treatment agent was not applied, and shows data indicating the effectiveness of the treatment agent. In Comparative Example 3, the content of the non-crystalline poly-alpha-olefin was set at 1.4 parts by weight based on 100 parts by weight of the binder resin. Is not measured.

In Comparative Example 4, the content of the non-crystalline poly-alpha-olefin was 31.8 parts by weight based on 100 parts by weight of the binder resin. The data also shifted upward, indicating that the adhesive strength was improved. However, the lower limit was lower than in Examples 1, 2 and 3, and the dispersion was large. Sexual anxiety remains. In addition, Comparative Example 4 cannot be adopted because it is inferior in stain resistance and has a high melt viscosity and poor workability.

Similarly, data on low-temperature adhesion when applied to a concrete surface, 1 mm on an existing sign
Considering the data on low-temperature adhesion when applied to a thickness of 1.5 mm or 1.5 mm, or the data on low-temperature impact resistance, stain resistance, low-temperature crack resistance, and melt viscosity, the effectiveness of amorphous poly-alpha-olefins It is understood that the content and the content at which the performance can be exhibited practically can be understood. In addition, attention was paid to low-temperature adhesiveness because the adhesive strength was significantly reduced at low temperatures. In addition, since a decrease in physical properties such as brittleness also occurs at a low temperature, an experiment was performed at a low temperature to evaluate.

[0019]

According to the present invention, in a heat welding type road marking paint comprising a binder resin, a plasticizer, a pigment, a reflector, a filler and the like, propylene alone or propylene is used with respect to 100 parts by weight of the binder resin. Non-crystalline poly-alpha-olefin copolymerized with ethylene or butene-1
30 parts by weight, and the number average molecular weight of amorphous poly-alpha-olefin obtained by copolymerizing propylene alone or propylene with ethylene or butene-1 is 500 to 20,000 (preferably 4,000 to 1).
000) and a non-crystalline poly-alpha-olefin obtained by copolymerizing propylene alone or propylene with ethylene or butene-1 having a melt viscosity at 190 ° C. of 400 to 15,000 cps. , Good adhesion, no treatment agent required,
It can also be used for repair work. The workability can be constructed without much difference from the currently used product, and there is no need to use special construction equipment. It has good stain resistance and does not require a treatment agent, so it can reduce the time required for traffic regulation, etc., and can develop and provide a heat welding type road marking paint using a conventional binder resin. is there.

[Brief description of the drawings]

FIG. 1 is a view showing low-temperature adhesiveness and melt viscosity characteristics of the present invention.

FIG. 2 is a view showing one example of a melt viscosity measuring instrument of the present invention.

Claims (3)

[Claims] 1. A heat welding type road marking paint comprising a binder resin, a plasticizer, a pigment, a reflector, a filler and the like, wherein propylene alone or propylene and ethylene or butene-1 are mixed with 100 parts by weight of the binder resin. A heat welding type road marking paint characterized by containing 2 to 30 parts by weight of a copolymerized non-crystalline poly-alpha-olefin. 2. A non-crystalline poly (propylene) alone or copolymerized with propylene and ethylene or butene-1.
The number average molecular weight of alpha-olefin is 500-20,
The heat welding type road marking paint according to claim 1, wherein the coating weight is 000 (preferably 4,000 to 10,000). 3. A melt viscosity at 190 ° C. of 400 to 1
The heat-welding type road marking paint according to claim 1 or 2, wherein 5,000 cps is propylene alone or a non-crystalline poly-alpha-olefin obtained by copolymerizing propylene with ethylene or butene-1.