JPH0673706A - Material for colored pavement and manufacture of admixture for colored pavement - Google Patents

Abstract

PURPOSE:To make work easy by a method wherein admixture made by mixing softened thermoplastic resin and pigment is molded or granulated, and the molded or granulated material is cut or pulverized after the material is cooled down and cured. CONSTITUTION:Pigment such as iron oxide red or chromium oxide in 20-60wt.% is added to thermoplastic resin that is softened by heating at temperatures ranging from 150 deg. to 170 deg.C, and mixing is made therefor. Then the admixture, with its thermoplastic resin still being softened, is molded or granulated, and the molded or granulated material is cured by cooling, or the admixture under the state of softening is cooled down and cured. After that, the admixture is cut or crushed, and thereby a material for colored pavement is prepared.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a material used for color paving and a method for producing a color paving mixture from this material.

[0002]

2. Description of the Related Art Today, with the development of cultural life, the construction of cities is gradually becoming more mature, and along with that, the roads that occupy a part of the city's living space, especially the pavement surfaces of sidewalks and plazas, are colored in various colors. There is a growing interest in pedestrians to entertain the eyes of the pedestrian, and to aesthetically harmonize the roads and plazas with the surrounding buildings, street trees, and other backgrounds. The demand for paving is increasing.

One way to apply this color paving is to add pigments to a conventional hot asphalt mixture in a mixer of an asphalt plant to obtain a colored asphalt paving material. However, in this method, since the asphalt used as a binder originally has a dark brown or black color, the pigment that can be used for coloring the asphalt mixture is not limited to red iron oxide (red iron oxide), and The color asphalt mixture obtained by means of which gives a dark color and it is not possible to obtain a paving material with other colors, in particular bright vivid colors.

As a solution to such a problem of the asphalt-based color paving mixture, there is a method of using a translucent or transparent thermoplastic resin in place of the above-mentioned asphalt. Although it is possible to obtain a color pavement material having various bright colors by using pigments of various colors, there are the following problems in actual construction using the color pavement material. (1) When preparing a color paving mixture using a thermoplastic resin in an existing asphalt plant, it is attached to the asphalt metering tank, asphalt spray pump, asphalt injection pipe (pipe) and mixer of the asphalt plant. It requires cleaning to remove asphalt in advance, inevitable use of a large amount of cleaning oil and performance of troublesome work. (2) Transporting thermoplastic resin to the site, that is, asphalt plant in a heated and molten state. Therefore, in order to carry this to the site before the resin has hardened, that is, to prevent the resin from cooling and hardening during transportation, a certain amount of resin, specifically, per lorry car A minimum of 5-6 tonnes of thermoplastic resin (usually from this amount of thermoplastic resin to 80% of color paving mixture) Must be transported 20 tons obtained), thus when the color pavement is small,
For example, in the case of construction work in which the amount of color paving material used is 50 tons or less, the amount of excess or discarded thermoplastic resin increases, and small-scale color paving work causes waste of materials and work. (3) In the conventional manufacturing operation of the above-mentioned color paving mixture, when the pigment is prepared by the mixer, the fine powder pigment is scattered around and adversely affects the health of the worker.

[0005]

Therefore, it is possible to eliminate the above-mentioned troublesome cleaning work in the asphalt plant, the preparation work of the fine pigment powder, and the carrying work of carrying the resin to the site in a lory while the resin is in a molten (softened) state. There has been a demand for the advent of a method for producing a mixture for color paving, which enables the thermoplastic resin to be applied to small-scale construction without waste.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and involves the above-mentioned troublesome washing work in an asphalt plant, the work of preparing a fine pigment powder, and the process of melting (softening) the resin. The purpose of the present invention is to provide a method for producing a color paving material that can apply a thermoplastic resin to a small-scale construction work without waste, without the need to carry it to the site as it is. A color paving material for producing a color paving mixture, which comprises a plastic resin, and (2) is molded, granulated, cut or crushed into a small lump, a chip, a pellet, a fragment or a powder. (3) A softened thermoplastic resin is mixed with a pigment, and the resulting mixture in a state where the resin is still softened is molded or granulated, and then the molded product is obtained. Is a color pavement material made of a thermoplastic resin containing a pigment, which is obtained by cooling and hardening the granular material or by cooling and hardening the mixture in the softened state and then cutting or crushing this. Manufacturing method, and (4) Color paving material consisting of a thermoplastic resin containing a pigment is mixed with preheated aggregate in a mixer, whereby the color paving material is softened by the heat of the aggregate. In addition, the present invention relates to a method for producing a mixture for color paving, which comprises forming a mixture in which these materials and the aggregate are intimately mixed with each other.

Since the color paving material of the present invention is solid, for example, it can be packed in bags and transported to the site, or it can be stored on site as it is. Can only be used.

The pigment used in the present invention may be either an inorganic pigment or an organic pigment, but since it is required to have heat resistance and weather resistance, an inorganic pigment is generally preferred. As the inorganic pigment, for example, red iron oxide (red), chromium oxide (green), titanium oxide (white), iron oxide (yellow) or iron trioxide (brown) can be used. The pigment is preferably in a fine powder state.

As the thermoplastic resin used in the present invention, any thermoplastic resin conventionally used for color pavement can be used, examples of which include, for example, Carax S (manufactured by Nikkei Seisaku Co., Ltd.) and Hiro. Chicks (manufactured by Toa Road Co., Ltd.), Fujikoshi Ace (manufactured by Fuji Kosan Co., Ltd.),
Crystal binder (modern Kasei Co., Ltd.) or melofalt (Showa Shell Co., Ltd.) can be used.

The color paving material according to the present invention is generally prepared by heating a thermoplastic resin to 150 to 170 ° C. to soften it, and adding a pigment to the softened thermoplastic resin and a pigment to the thermoplastic resin. Depending on the amount added,
Generally added in an amount of 20-60% by weight and mixed, the resulting mixture being in a state where the resin is still soft,
For example, after molding or granulating into a small block, a chip or a pellet, the molded body or granules are cooled and cured, or the mixture in the softened state is cooled and cured and then cut. Alternatively, it can be produced by crushing.

As a method for forming a chip, for example, a plate having a thickness of 2 to 5 mm is formed and then, for example, 5 to 10 mm.
A method of cutting into a dimension of 5 to 10 mm can be mentioned. As a method for forming a pellet, for example, the softened resin is pressed into a hole having a diameter of 5 to 8 mm, the extruded product is rapidly cooled, and then cut into a size of 5 to 10 mm.

In the method for producing a color paving mixture according to the invention, a color paving material consisting of a thermoplastic resin containing a pigment is mixed in a mixer with preheated aggregate, whereby said material is The heat of the material softens it. In this case, the temperature of the aggregate is generally higher than the temperature in the case of producing the thermoplastic resin mixture for color pavement, specifically, it depends on the kinematic viscosity of the thermoplastic resin used, but it is generally 180 to 200. To ℃. Then, a colored coating film of a thermoplastic resin containing a pigment is formed on the surface of the heated aggregate. The ratio of the material to the aggregate varies depending on the particle size of the aggregate, but is generally 4 to 10:96 to 90.

The resulting color paving mixture is used in the construction of roads, especially sidewalks, in place of the hot asphalt mixture.

[0014]

EXAMPLES The present invention will be described below with reference to examples.
The invention is not limited to these examples.

Example 1 3.3 kg of thermoplastic resin was heated to 170 ° C. to be melted. To this, 1.7 kg of chromium oxide was added and mixed, and the resulting mixture was allowed to stand and cooled to room temperature. This was extended into a plate having a thickness of 4 mm and cut into chips having a size of 6 mm × 8 mm. The obtained chip-shaped material had a green color.

Example 2 3.6 kg of thermoplastic resin was heated to 170 ° C. to be melted. To this, 1.4 kg of iron oxide was added and mixed, and the resulting mixture was allowed to stand and cooled to room temperature. . This is thickness 5
It was rolled into a plate having a size of mm and cut into a chip having a size of 6 mm × 10 mm. The obtained chip-shaped material had a red color.

Example 3 3.8 kg of thermoplastic resin was heated to 170 ° C. to be melted. To this, 1.2 kg of iron oxide was added and mixed. This was pressed into a hole having a diameter of 8 mm, and the extruded product was rapidly cooled and cut into a pellet having a length of 8 mm.

The resulting pelletized material had a red color. Example 4 Aggregate 1 of standard blend of mixture (Dense Ascon 13 mm)
8.5 kg was heated to 200 ° C. This was put into a mixer. When 1.5 kg of the material obtained in Example 1 was added thereto and mixed for about 1 minute, a soft green thermoplastic resin film was formed on the surface of the aggregate.

Example 5 Aggregate 1 with a standard blend of the mixture (fine grained Ascon 13 mm)
8.0 kg was heated to 200 ° C. and charged into a mixer. 2.0 kg of the material obtained in Example 2 was added thereto and mixed for about 1 minute, whereby a soft red thermoplastic resin film was formed on the surface of the aggregate.

Example 6 Aggregate 1 with a standard mixture of mixture (open grain size Ascon 13 mm)
8.8 kg was heated to 200 ° C. and charged into a mixer. When 1.2 kg of the material obtained in Example 3 was added and mixed for about 1 minute, a soft red thermoplastic resin film was formed on the surface of the aggregate.

[0021]

As is apparent from the above description, according to the present invention, it is not necessary to use an asphalt tank or a tank truck for producing a color paving mixture, and a molten thermoplastic resin is used. Instead of passing it through an asphalt metering tank, spray pump and piping, after weighing the color paving material according to the present invention and directly charging it into the mixer, the laborious work of removing the asphalt from these parts in the asphalt plant This paving mixture can be easily produced in a conventional asphalt plant by simply cleaning in a mixer, which is relatively easy to clean. Furthermore, even without using a tank truck, it is possible to transport it to the site in a convenient packing form such as bagging and store it for a long time as it is, and to carry out color paving work, according to the scale Since the material of the present invention can be added in the required amount, it is not necessary to heat and melt a large amount of the thermoplastic resin. Therefore, it is suitable for a small-scale construction and the construction can be speeded up. Further, in the color paving material of the present invention, since the pigment and the thermoplastic resin are mixed in advance, it is possible to avoid the inconvenience that fine powder of the pigment flies up during the work in the plant and impairs the health of the worker.

Claims (4)

[Claims] 1. A thermoplastic resin containing a pigment,
Color paving material for producing a color paving mixture. 2. The color paving material according to claim 1, which is molded, granulated, cut or crushed into a small lump, a chip, a pellet, a fragment or a powder. 3. A softened thermoplastic resin is mixed with a pigment,
After molding or granulating the resulting mixture in a state where the resin is still softened, the molded body or granules are cooled and cured, or the mixture in a softened state is cooled and cured. A method for producing a color paving material comprising a thermoplastic resin containing a pigment, which is obtained by cutting or crushing the resin. 4. A color paving material made of a thermoplastic resin containing a pigment is mixed with preheated aggregate in a mixer, whereby the color paving material is softened by the heat of the aggregate, and A method for producing a color paving mixture, which comprises forming an intimate mixture of these materials and aggregates.