JPH07207606A - Rubber chip paving material - Google Patents

Abstract

PURPOSE:To stably store a paving material for a long time, by adding a specified quantity of an organic acid halogenide to a rubber chip paving material mixed with rubber chips and urethane binder. CONSTITUTION:An organic acid halogenide is added to a rubber chip paving material mixed with rubber chips and urethane binder at the rate of 0.1-10wt.% against urethane binder. The organic acid halogenide is at least one kind of halogenide or chloride of carboxylic acid selected from a group composed of aliphatic monocarbokylic acid, aliphatic dicarboxylic acid, aromatic monocarboxylic acid, and aromatic dicarboxylic acid. It is preferable that the paving material contains a pigment as much as 2.5-20wt.% against the urethane binder. In this way, even if the material is used after storage for a long time, an excellent pavement can be obtained in comparison with a paving material prepared in the construction site.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber chip pavement material having excellent storage stability.

The rubber chip pavement is well drained and non-slippery, has appropriate elasticity and sound absorption, and can be colorfully finished by adding a pigment, and is easy to construct and maintain. Therefore, in recent years, tennis courts, athletic fields, golf course paths, rooftops of buildings,
Widely used for pavement such as sidewalks.

[0003]

2. Description of the Related Art In rubber chip pavement, it has been generally practiced to mix a rubber chip, a urethane binder and a pigment to prepare a rubber chip pavement material at a construction site and then carry out the construction. However, when preparing a rubber chip pavement material on site, not only is the construction time-consuming, but also a mixing device such as a mixer is required. Further, since there is an unavoidable variation in the weighing accuracy and mixing time of the rubber chips and urethane binders, there is a problem in that the quality of the rubber chip pavement material, and thus the rubber chip pavement surface, varies greatly. There is also a problem that a large amount of waste is generated.

As a method for solving the problems of the conventional method,
A method of preparing a rubber chip pavement material in a factory in advance, storing it in a bag and storing it, and carrying the bagged rubber chip pavement material to a construction site for construction when necessary was studied. However, if this method is adopted, the urethane binder in the rubber chip pavement material may react with moisture in the air or moisture in the material to be cured during storage or transportation,
As a result, it cannot be used as a rubber chip pavement material, or even if it can be used, a pavement surface excellent in tensile strength and elongation may not be obtained.

As a method for solving this problem, a rubber chip pavement material is prepared by using sufficiently dried rubber chips and pigments, and the rubber chip pavement material is put in a non-moisture permeable container such as a laminated film bag in which polyethylene and aluminum foil are laminated. A method of filling, storing and transporting was proposed (Japanese Patent Application No. 4-22110).
No. 5). According to this method, storage for a certain period of time is possible. However, in reality, it is almost impossible to completely remove the rubber chips and the pigment. Further, it is almost impossible to prepare a rubber chip pavement material in an atmosphere in which moisture is completely shut off. Therefore, some amount of water remains in the rubber chip pavement material, and during storage and transportation, the rubber chip pavement material is cured by the water content. Therefore, when the rubber chip pavement material stored for a long time by this method is used for construction, there is a problem that a pavement surface excellent in tensile strength and the like cannot be obtained as compared with the rubber chip pavement material prepared on site.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rubber chip pavement material which has excellent storage stability and provides a pavement surface comparable to that of the rubber chip pavement material prepared on site.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a rubber chip pavement material obtained by mixing a rubber chip and a urethane binder, wherein a halide of an organic acid is added. In the above rubber chip pavement material, the amount of the organic acid halide added is 0.1 to 10% by weight based on the urethane binder.
Which is a rubber chip pavement material. The rubber chip pavement material of the present invention, further, as a halide of an organic acid in the above rubber chip pavement material, a group consisting of an aliphatic monocarboxylic acid, an aliphatic dicarboxylic acid, an aromatic monocarboxylic acid, and an aromatic dicarboxylic acid. Also included are rubber chip pavement materials using one or more selected carboxylic acid halides. In these rubber chip pavement materials,
Those containing 2.5 to 20 parts by weight of pigment based on the urethane binder are also included in the rubber chip pavement material of the present invention.

The rubber chips, urethane binders, halides of organic acids, and pigments, which are the materials for the rubber chip pavement material of the present invention, will be described below.

First, the rubber chip will be described. The rubber chip used in the present invention is obtained by crushing and / or cutting a waste tire, a waste window frame rubber, a waste rubber belt, a waste urethane bumper or the like into a chip shape. Various methods such as low-temperature crushing and cutting with a cutter are used for crushing and / or cutting. In addition, diene rubbers such as natural rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, isoprene rubber, and butyl rubber, and hydrogenated products thereof, and ethylene propylene rubber, ethylene-propylene-diene ternary copolymer A product obtained by crushing and / or cutting a rubber such as an olefin elastomer such as coalesced or chlorinated polyethylene or chlorosulfonated polyethylene into chips having a predetermined particle size is also preferably used.
These rubbers are preferably those to which pigments, antiaging agents, and various fillers have been added in advance. The pigment is
What is mentioned as a preferable thing to add to a rubber chip pavement material can be used. Further, these rubbers can be vulcanized in advance. Further, a material obtained by crushing and / or cutting soft vinyl chloride, polyurethane rubber or polyether rubber is also preferably used. Of the above rubber chips, particularly preferable ones are those obtained by crushing and / or cutting diene rubber, and those obtained by crushing and / or cutting waste tires, waste window frame rubber, and waste rubber belts. This is because these rubber chips are particularly excellent in wear resistance, cold resistance, elasticity and the like. As the diene rubber, it is preferable to use vulcanized one in advance. The particle size of the rubber chips varies slightly depending on the paving location, but the average particle size is 10 mm.
The following are preferable from the viewpoint of water permeability and elasticity. A particularly preferred range is an average particle size of 1 to 5 mm. It is preferable to dry the rubber chips as much as possible. Specifically, the water content is 3000 ppm or less, preferably 2000 ppm or less,
Particularly preferably, a rubber chip of 1000 ppm or less is preferable. The method for obtaining the rubber chips having such a water content is not particularly limited, but for example, a method of crushing and / or cutting a previously dried rubber into chips, a method of drying the rubber chips obtained by crushing and / or cutting Can be obtained by Further, the rubber may be crushed and / or cut into chips in a dry atmosphere.

The urethane binder is preferably a one-component type which is hardened by moisture in the atmosphere to form a rubber. Examples thereof include one-component curable urethane binders such as tolylene diisocyanate type which have been conventionally used for rubber chip pavement materials.

As the organic acid halide, one or two kinds of carboxylic acid halides selected from the group consisting of aliphatic monocarboxylic acids, aliphatic dicarboxylic acids, aromatic monocarboxylic acids, and aromatic dicarboxylic acids. The above is used. Specifically, fluorides of these carboxylic acids,
Included are chloride, bromide, and iodide. Among these organic acid halides, preferred are fluorides and chlorides of aliphatic monocarboxylic acids having 1 to 20 carbon atoms,
Bromide, iodide, fluoride of dicarboxylic acid having 1 to 20 carbon atoms, chloride, bromide, iodide, and 7 to 14 carbon atoms
The aromatic monocarboxylic acid fluorides, chlorides, bromides, and iodides, and the aromatic dicarboxylic acid fluorides, chlorides, bromides, and iodides having 7 to 14 carbon atoms. Most preferred among these organic acid halides are chlorides of aliphatic monocarboxylic acids having 1 to 20 carbon atoms and 1 carbon atoms.
A chloride of a dicarboxylic acid having 20 to 20 carbon atoms, a chloride of an aromatic monocarboxylic acid having 7 to 14 carbon atoms, and a chloride of an aromatic dicarboxylic acid having 7 to 14 carbon atoms. Specifically, acetic acid chloride, propionic acid chloride, butyric acid chloride, valeric acid chloride, caproic acid chloride, enanthic acid chloride, caprylic acid chloride, pelargonic acid chloride, capric acid chloride, undecyl acid chloride, lauric acid chloride, tridecyl acid chloride. ,
Aliphatic monocarboxylic acid chlorides such as myristic acid chloride, palmitic acid chloride, stearic acid chloride, oxalic acid chloride, malonic acid chloride, succinic acid chloride, glutaric acid chloride, adipic acid chloride, pimelic acid chloride, azelaic acid chloride, suberic acid Aromatic dicarboxylic acid chlorides such as chloride and sebacic acid chloride, benzoic acid chloride, naphthoic acid chloride, phenylacetic acid chloride, 1-phenylpropionic acid chloride, 2-phenylpropionic acid chloride, naphthylacetic acid chloride and other aromatic monocarboxylic acids Examples thereof include chlorides, phthalic acid chlorides, terephthalic acid chlorides, aromatic dicarboxylic acid chlorides such as naphthalene dicarboxylic acid chlorides, and the like.

As the pigment, both organic and inorganic pigments can be used as long as they are commonly used for coloring rubber, but from the viewpoint of weather resistance and colorability, inorganic pigments and phthalocyanine pigments can be used. Pigments are preferred. Specifically,
Chromium green, zinc oxide, titanium oxide, titanium white, nickel titanium yellow, chromium titanium yellow, lithobon, carbon black, calcium carbonate, barite, barium sulfate, phthalocyanine blue, phthalocyanine green and the like are preferably used.

In the rubber chip pavement material of the present invention, a rubber chip, a urethane binder, a halide of an organic acid,
The proportions of the pigments are as follows.

The ratio of the rubber chips to the urethane binder is preferably in the range of 10 to 50 parts by weight of the urethane binder, and particularly preferably in the range of 20 to 40 parts by weight of the urethane binder with respect to 100 parts by weight of the rubber chips. If the amount of urethane binder is less than 10 parts by weight, it will be difficult to mix it with rubber chips and the amount of urethane binder will be 50%.
If it is more than the weight part, a paved surface excellent in water permeability and elasticity cannot be obtained.

The proportion of the organic acid halide is in the range of 0.1 to 10% by weight, preferably 0.5 to 2% by weight, based on the urethane binder. When the ratio of the halide of organic acid is less than 0.1% by weight based on the urethane binder, there is a problem in that when the rubber chip is applied after being stored for a long time, only a construction surface having poor physical properties such as tensile strength and elongation can be obtained. There is. On the other hand, when the content is more than 10% by weight with respect to the urethane binder, the expansion and contraction of the urethane binder due to temperature change becomes large, and the pavement surface after the construction may warp, which is not preferable.

The pigment may be added as necessary, but it is preferably 20% by weight or less, more preferably 2.5 to 20% by weight, based on the urethane binder.

In preparing the rubber chip pavement material of the present invention, the rubber chips, urethane binder, halide of organic acid, and pigment may be mixed in any order. For example, a rubber chip and a urethane binder may be mixed, and if necessary, a pigment may be further mixed, and then a halide of an organic acid may be mixed. Further, the rubber chip, the urethane binder and the organic acid halide may be mixed at the same time. However, the most preferred procedure is to add the organic acid halide to the urethane binder and then mix the rubber chips and, if desired, the pigment. In the above mixing operation, a mixer such as a mortar mixer is preferably used. The rubber chip pavement material thus prepared must be enclosed in a non-moisture permeable container so as not to be cured by moisture in the atmosphere during storage and transportation. As the non-moisture permeable container, for example, a bag of a single-layer or multi-layer film of polyethylene, polypropylene, ethylene-propylene copolymer, various nylons, polyester resins, synthetic resins such as vinyl chloride, or aluminum foil or paper for these films. Examples thereof include a laminated bag, a can of metal and the above synthetic resin, and the like. The rubber chip pavement material is preferably prepared and filled in dry air having a humidity of 30% or less, preferably 20% or less, or in an inert gas such as nitrogen or argon gas. If these operations are performed in normal air, moisture in the air during preparation and storage will cause hardening of the rubber chip pavement material, and decomposition of the organic acid halide in the rubber chip pavement material will result in stable storage. A rubber chip pavement material having high properties cannot be obtained, which is not preferable.

The rubber chip pavement material of the present invention can be applied in exactly the same manner as the conventional rubber chip pavement material. Specifically, it can be constructed in the following procedure. First, clean the base surface,
dry. Next, a primer is applied, a rubber chip paving material is laid and leveled, the paved surface is finished flat with a register mark, a compaction roller or the like, and further the surface or end is finished with a metal trowel or the like. Then, it is left at room temperature to cure the rubber chip pavement material. As the underlayer, asphalt concrete pavement or concrete paved surface is preferable, but the surface is not limited to these surfaces, and a rubber chip of the present invention as long as it is a surface to which a urethane binder such as a crushed stone paved surface or an iron plate can firmly adhere Can be paved with paving materials. Therefore, the rubber chip pavement material of the present invention,
Other than tennis courts, track and field, golf course walkways,
It is also preferably used for pavements such as promenades, jogging courses, and pedestrian bridges.

[0019]

Since the rubber chip pavement material of the present invention withstands storage for a long period of time, it does not become unusable due to curing during storage or transportation, and even if it is stored for a long period of time, it can be used at the construction site. The paved surface is comparable to the rubber chip paving material prepared in. Further, the rubber chip pavement material of the present invention need not be brought into the construction site, such as a mixer, because the rubber chip pavement material prepared in a factory is carried to the construction site for construction. Furthermore, since the paved surface obtained by paving with the rubber chip paving material of the present invention is porous with a porosity of about 10 to 30%, it is well drained and has a friction resistance almost the same as that of the asphalt paved surface. Is obtained. Further, the obtained paved surface is excellent in elasticity and also has a good walking feeling. In addition, since industrial waste such as waste tires can be used as the material of the rubber chip, it can be manufactured extremely inexpensively.

[0020]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 Rubber chips dried at 100 ° C. for 5 hours (material: polybutadiene rubber, average particle size: 2)
~ 3 mm, water content: 1000 ppm) 100 parts by weight and 25 parts by weight of a one-component urethane binder containing 1% by weight of stearyl chloride at a temperature of 20 ° C and a humidity of 1
Mix evenly in a mixer in low humidity air below 0%,
A rubber chip pavement material was prepared. Next, the rubber chip pavement material was packed in a moisture-proof bag in which polyethylene was laminated with aluminum foil in the above atmosphere. After this rubber chip pavement material was stored at room temperature for one month, it was opened and poured into a mold to prepare a test piece, and its tensile strength and elongation were measured. On the other hand, also for the rubber chip pavement material immediately after preparation, a test piece was prepared in the same manner, the tensile strength and the elongation were measured, and the tensile strength and the elongation of the test piece prepared from the stored rubber chip pavement material were compared. The results are shown in Table 1.

Example 2 A rubber chip pavement material was prepared in the same manner as in Example 1 except that phthalic acid chloride was used instead of stearic acid chloride in Example 1.
It was stored for one month. A test piece was prepared from the rubber chip pavement material after storage, the tensile strength and elongation were measured, and the tensile strength and elongation of the test piece prepared from the rubber chip pavement material immediately after preparation were compared. The results are shown in Table 1.

Example 3 A rubber chip pavement material was prepared in the same manner as in Example 1 except that butyric acid chloride was used instead of stearic acid chloride in Example 1.
It was stored for one month. A test piece was prepared from the rubber chip pavement material after storage, the tensile strength and elongation were measured, and the tensile strength and elongation of the test piece prepared from the rubber chip pavement material immediately after preparation were compared. The results are shown in Table 1.

Example 4 A rubber chip pavement material was prepared in the same manner as in Example 1 except that benzoic acid chloride was used in place of stearic acid chloride in Example 1 and stored for one month. A test piece was prepared from the rubber chip pavement material after storage, the tensile strength and elongation were measured, and the tensile strength and elongation of the test piece prepared from the rubber chip pavement material immediately after preparation were compared. The results are shown in Table 1.

Comparative Example 1 A rubber chip pavement material was prepared in the same manner as in Example 1 except that stearic acid chloride was not added and stored for one month. A test piece was prepared from the rubber chip pavement material after storage, the tensile strength and elongation were measured, and the tensile strength and elongation of the test piece prepared from the rubber chip pavement material immediately after preparation were compared. The results are shown in Table 1.

Comparative Example 2 100 parts by weight of rubber chips similar to the rubber chips used in the examples were uniformly mixed with 25 parts by weight of a one-component urethane binder in a mixer without drying to prepare a rubber chip paving material. Prepared. Next, the rubber chip pavement material was packed in a moisture-proof bag in which polyethylene was laminated with aluminum foil. Preparation and bagging of rubber chip pavement material should be done in normal air (20 ℃, humidity 65
%). When this rubber chip pavement material was stored at room temperature for one month and then opened, the rubber chip pavement material was already cured, and a test piece could not be prepared. The results are shown in Table 1.

[0027]

[Table 1]

[0028]

Claims (5)

[Claims] 1. A rubber chip pavement material obtained by mixing a rubber chip and a urethane binder, wherein a halide of an organic acid is added. 2. The rubber chip pavement material according to claim 1, wherein the amount of the organic acid halide added is 0.1 to 10% by weight based on the urethane binder. 3. A halide of an organic acid is an aliphatic monocarboxylic acid, an aliphatic dicarboxylic acid, an aromatic monocarboxylic acid,
The rubber chip pavement material according to claim 1 or 2, which is at least one kind of a halide of a carboxylic acid selected from the group consisting of and an aromatic dicarboxylic acid. 4. An organic acid halide is an aliphatic monocarboxylic acid, an aliphatic dicarboxylic acid, an aromatic monocarboxylic acid,
The rubber chip pavement material according to claim 3, wherein the rubber chip pavement material is at least one kind of chloride of a carboxylic acid selected from aromatic dicarboxylic acids. 5. A urethane binder of 2.5 to 20
The rubber chip pavement material according to any one of claims 1 to 4, which contains a pigment in a weight percentage.