JP4667777B2 - Heat melting type paving material - Google Patents

Description

  The present invention relates to a heat-melting type pavement material used for forming a non-slip pavement applied to a road surface.

  For example, Patent Document 1 discloses a powder 100 having an average particle diameter of 1 to 150 μm with respect to 100 parts by weight of a thermosetting resin. An anti-slip material containing ˜1000 parts by weight is disclosed.

  Further, in Patent Document 2, there is a non-skid pavement in which a part of the plant granular material is left on the surface of the binder layer and the other part is embedded in the binder layer in the binder layer made of resin or bituminous. It is disclosed.

JP-A-62-125105 JP 10-280308 A

  However, in the conventional non-slip pavement materials such as those shown in Patent Documents 1 and 2, the visibility at night depends on the retroreflection due to the brightness of the blended aggregate and the like, and the high retroreflection at night. There was a risk that alerting of dangerous places such as curve points would not be sufficiently performed because of lack of sex.

  The present invention has been made in view of the problems as described above, and an object of the present invention is to provide a heat-melt type pavement material having a high retroreflective property at night while maintaining a sufficient anti-slip effect.

In order to achieve the above object, the present invention is configured as follows. That is, the heat-melt type pavement material according to the present invention is 100 to 100 non-slip aggregates made of colored porcelain aggregates having a particle size of 0.5 mm to 5 mm with respect to 100 parts by weight of a binder made of thermoplastic synthetic resin. 500 parts by weight is blended, and further 5 to 500 parts by weight of glass beads are blended. The glass beads are JIS glass beads having a particle size of 106 to 850 μm as defined in JIS R3301-1, and a sphericity of 90% or more. In addition, it is composed of large spherical glass beads having a particle size of 600 to 800 μm with a deformed mixture ratio of less than 1% .

  Here, as the thermoplastic synthetic resin used as the binder, those used for general heat-melting type pavement materials such as petroleum resin, rosin, and acrylic resin can be used. As the non-slip aggregate, those used for general heat-melting type pavement materials such as ceramic, bauxite and mineral stone can be used. When the amount of the non-slip aggregate is less than 100 parts by weight based on 100 parts by weight of the binder, the non-slip aggregate is buried in the binder and a sufficient anti-slip effect cannot be obtained, and the amount exceeds 500 parts by weight. And the fluidity at the time of melting deteriorates and the workability is lowered.

  For glass beads, general-purpose glass beads specified in JIS R3301-1 can be used. However, if glass beads with high sphericity and low irregularity mixture ratio are used, the amount of glass beads to be blended is reduced. High retroreflectivity can be obtained. When the glass beads to be blended are less than 5 parts by weight with respect to 100 parts by weight of the binder, sufficient retroreflective properties cannot be obtained, and when they exceed 500 parts by weight, the workability is deteriorated due to the deterioration of fluidity, and on the surface. The ratio of the apparent glass beads becomes too large, leading to a decrease in the anti-slip effect.

  In addition, as with general heat-melting type pavement materials, fillers such as calcium carbonate, plasticizers that enhance fluidity, pigments for coloring, other additives, etc., depending on the required application and workability Can be appropriately blended.

  According to the heat-melt type pavement material according to the present invention, a sufficient anti-slip effect is ensured by the anti-slip aggregate, and high retroreflectivity at night can be obtained by blending glass beads. . Furthermore, since glass beads are blended in the material, a decrease in retroreflectivity due to wear after paving can be suppressed, and high retroreflectivity can be maintained over a long period of time.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described based on a comparison between the following examples and comparative examples.

  The materials shown in Table 1 and parts by weight were blended to obtain heat-melt type pavement materials of Examples 1 to 3 and Comparative Examples 1 to 3.

  First, as the synthetic resin used for the binder, petroleum resin is generally used, but thermoplastic resins such as raw rosin, maleated rosin, maleated rosin ester, polyamide resin, unsaturated polyester resin, xylene resin are used. Also good. As for the compounding quantity of caking resin, 10-20 weight part is preferable. When the blending amount is 10 parts by weight or less, the fluidity and adhesiveness of the paint are inferior. When the blending amount is 20 parts by weight or more, the stain resistance of the coating film is deteriorated.

  The JIS glass beads are general-purpose glass beads defined in JIS R3301-1 and used for road marking paints. The particle size is not particularly limited, but those having a particle size of about 106 to 850 μm are suitable for the fluidity of the material. It can be suitably used with little adverse effect. Large spherical sphere glass beads, for example, have a sphericity of 90% or more and a deformed mixture ratio of less than 1%, and can have a higher retroreflective property than JIS glass beads by spreading or mixing into paving materials. is there. As the large spherical sphere glass beads, those having a particle diameter of about 600 to 800 μm can be suitably used. Retroreflectivity is enhanced by mixing a large amount of glass beads, but this leads to high costs and a decrease in the slip resistance value of the surface. Therefore, the upper limit of the blending amount is 500 parts by weight or less with respect to 100 parts by weight of the binder. Preferably, it is 300 parts by weight or less. The lower limit of the blending amount is about 5 parts by weight with respect to 100 parts by weight of the binder, but it is preferable to blend 50 parts by weight or more when using JIS glass beads in order to obtain sufficient reflection luminance. The large particle size spherical glass beads are 5 parts by weight or more, preferably 20 parts by weight or more. Furthermore, JIS glass beads and large particle size spherical glass beads may be used in combination.

  For example, Serapeburu (trade name), which is a colored porcelain aggregate, can be suitably used. In addition, those used for general heat-melting type pavement materials such as ceramics, bauxite, and mineral stones can be used. Can be used. When the amount of the non-slip aggregate is less than 100 parts by weight based on 100 parts by weight of the binder, the non-slip aggregate is buried in the binder and a sufficient anti-slip effect cannot be obtained, and the amount exceeds 500 parts by weight. And the fluidity at the time of melting deteriorates and the workability is lowered. More preferably, it is in the range of about 100 to 300 parts by weight.

  Further, as the filler, calcium carbonate, silica sand, cold water sand, talc and the like are used. The blending amount of the filler is preferably 10 to 45 parts by weight. The blending amount is preferably 10 to 45 parts by weight because it is inferior in the stain resistance and abrasion resistance of the coating film at 10 parts by weight or less, and at 45 parts by weight or more, the adhesiveness of the coating film is lowered and cracking occurs. .

  Other additives include antioxidants and anti-settling waxes, plasticizers such as vegetable oils, vegetable oil-modified alkyd resins, phthalates, white pigments such as titanium dioxide, zinc white, lithopone, yellow lead, titanium yellow, etc. A pigment such as a yellow pigment can be blended in an appropriate amount as necessary.

  About the example and comparative example of the above-mentioned heat-melt type pavement material, on the pavement surface formed by melting and applying the heat-melt type pavement material at 170 ° C., measurement of the slip resistance value in a wet state, immediately after application Measurement of reflection brightness after blasting, verification of workability during construction, and measurement of adhesion strength.

  The slip resistance value in a wet state was measured by measuring the slip resistance value (BPN value) using a portable skid tester (developed by the British Road Traffic Research Institute, manufactured by WF Stanley) with the constructed pavement surface wet. Is. Regarding the slip resistance value (BPN value), the situation corresponding to the numerical value is shown in the guidelines of the Road Research Laboratory according to the BPN value in the wet state, and the situation is shown in Table 2. .

  The reflection luminance value is measured on the front pavement surface with a pavement surface in a dry state and a luminance meter (Milolux 7, manufactured by Potters Barotini) at an incident angle of 86.5 ° and an observation angle of 1.5 °. The brightness of the pavement surface is measured by further receiving the light from the irradiated projector by a front light receiver. Regarding the measurement of the reflected luminance value after blasting, the granular calcium carbonate was paved with a projection angle of 90 °, a projection pressure of 0.5 MPa, and a projection distance of 100 mm using an air blast machine (PM-02 type tester, manufactured by Nichu). And the pavement surface is deleted by a thickness of 0.5 mm. The pavement surface of the deleted part is measured using the luminance meter.

  The evaluation of workability is that when the construction speed is 1.2 km / h and the thickness is 2.5 mm and the width is 15 cm, the load on the construction machine at the time of construction is within the allowable range, or problems such as blurring occur. This is confirmed visually.

  Adhesion strength was obtained by applying road marking paint on a concrete flat plate at 170 ° C, leaving it to stand at 23 ° C for 18 hours, performing a tensile test with an autograph at a test speed of 5 mm / min, and measuring the maximum load until peeling. It is.

  The results obtained for these items are shown in Table 3.

  Comparative Example 1 is a general-purpose heat-melting type white road marking paint. In Examples 1 to 3, the reflection luminance value immediately after application is similar to that of Comparative Example 1, and sufficient retroreflectivity is obtained. It is shown that. Comparative Example 2 is an aggregate-mixed anti-skid pavement that is generally paved in a zebra shape on a curve or the like. Examples 1 to 3 all show slip resistance values that are not significantly different from Comparative Example 2. It has been shown that it exhibits sufficient performance as a non-slip pavement, and there is no significant decrease in the reflection luminance value and slip resistance value after blasting, and even when wear occurs over a long period of use It has been shown that retroreflective and anti-slip effects can be maintained. In addition, there is no deterioration in workability due to the mixing of glass beads and no decrease in adhesion to the road surface, and it is possible to obtain a pavement material that has low risk of peeling after construction using ordinary construction equipment. It is shown.

Claims (1)

100 to 500 parts by weight of non-slip aggregate made of colored porcelain aggregate having a particle diameter of 0.5 mm to 5 mm is blended with 100 parts by weight of binder made of thermoplastic synthetic resin, and further glass beads are 5 to 500 weights. The glass beads are JIS glass beads having a particle diameter of 106 to 850 μm as defined in JIS R3301-1, and a glass particle having a particle diameter of 600 to 800 μm with a sphericity of 90% or more and a deformed contamination rate of less than 1%. A heat melting pavement material characterized by comprising large-diameter spherical glass beads .