CROSS-REFERENCE TO RELATED APPLICATIONS

The present invention claims the priority benefit, under 35 U. S. C. § 119, of Korean Application No. 10-2004-0089792 filed November 5, 2004 and Korean Application No. 20-2004-0031327 filed November 5, 2004, the entirety of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention:

The present invention relates to an asphalt waterproof composition containing waste tire chips and bentonite, and process for its manufacture, and more particularly, to an improved asphalt waterproof composition comprising the steps of providing jelly asphalt, heating and mixing the jelly asphalt and waste tire chips, and adding bentonite to the mixture for having a high elastic cohesive power.

2. Description of Background Art:

Various types of asphalt compositions and its methods of manufacture are known in the art. Generally, now days, conventional asphalt composition combines asphalt with elastic rubber for solving a number of problems of weakness about

elasticity, shock and crack of such a conventional asphalt. However, it remains unsolved problems such as the conventional asphalt comes undone from the floor, is easy to crack, and looses waterproof power easily.

In order to solve such a problem, a conventional asphalt composition includes bentonite as an asphalt modifier. Bentonite as a soft, porous and moisture absorbing clay, has high swelling capacity in water or with negligible swelling capacity, and forms colloidal suspensions in water with strongly thixotropic properties. In such a conventional asphalt composition, role of bentonite provides a certain workability for making a construction of asphalt on the floor.

However, such a conventional asphalt composition containing bentonite suffers from a number of problems. For example, since the porous bentonite maintains the degree of unswelling with a certain unhydrophilic fluid, the unhydrophilic fluid does not have prevention, or has a weak preservation about the bentonite, the bentonite is going to swell and be washed away by water continuously, after construction of such a conventional asphalt composition containing bentonite when the bentonite contacts to a high speed of water or does not seal in a certain space. Therefore, the waterproof power of the conventional asphalt composition goes down, so that the user cannot obtain a desirous waterproof power.

In addition, such a conventional asphalt composition containing bentonite combines with polybutene and butyrubber usually. However, when the conventional asphalt composition is going to dry for a long time, polybutene and butyrubber make to fall down the degree of swelling of the bentonite. Therefore, the constructed asphalt composition may be easily cracked. Also, bentonite is very expensive for using a lot of amount thereof.

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide an asphalt waterproof composition containing waste tire chips and bentonite, and a process for its manufacture, which eliminates the above problems encountered with conventional asphalt compositions.

Another object of the present invention is to provide an improved asphalt composition and method its manufacture for improving the waterproof power and elasticity thereof and preventing from weakness of shock, crack and curl thereof by using a certain amount of waste tire chips and bentonite to asphalt base.

A further object of the present invention is to provide an improved asphalt waterproof composition includes styrenebutadiene rubber extracted from waste tire chips melting solution, combined with bentonite and asphalt by bridging structure of rubber, so that the present asphalt composition has a high waterproof power and preventing from losing the bentonite.

Still another object of the present invention is to provide an asphalt composition for self repairing the piercing portions which the metal wires, concrete chips, earth and sand, pipes etc went through the waterproof layer thereof and the curled portions which came undone from the floor by the swelling power from the hydrophilic reaction of bentonite and the hydrophilic reaction from high polymer resin thereof.

Yet another object of the present invention is to provide a process for the preparation of asphalt composition containing waste tire chips and bentonite which comprises the steps of mixing and heating asphalt, oil, filler and surface-active agent at a temperature of about 150°-180°C to produce jelly asphalt, mixing the jelly asphalt with melting solution of waste tire chips, sulfur, sulfur vulcanizing agent, rubber

antiaging agent at a temperature of about 150°- 180 ⁰ C to produce waste tire chips melting mixture asphalt waterproof solution, and agitating the waste tire chips melting mixture asphalt waterproof solution with bentonite and water soluble high polymer resin.

A further object of the present invention is to provide a process for manufacturing an asphalt waterproof composition containing waste tire chips and bentonite which comprises the steps of mixing and heating together about 10-15 of asphalt, about 20-50 of oil, about 8-12 of filler, about 1-3.5 of elasticity increasing agent, and about 0.1-0.5 of surface-active agent by weight, respectively, at a temperature of about 150°- 180 ⁰ C to form a jelly asphalt, mixing the jelly asphalt with about 25-40 of waste tire chips melting solution, about 0.5-1 of surfur, about 0.05-1 of sulfur vulcanizing agent, and 0.1-0.4 of rubber antiaging agent by weight, respectively, at a temperature of about 150°- 180 ⁰ C to form a waste tire melting asphalt solution, and mixing and agitating the waste tire melting asphalt solution with about 10-20 of bentonite and about 1 -5 of water soluble high polymer resin by weight, respectively.

Other objects and further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. It should be understood, however, that the detailed description and specific example, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now in detail to the drawings for the purpose of illustrating preferred embodiments of the present invention, the asphalt waterproof composition containing waste tire chips and bentonite which includes about 10-15 of asphalt, about 20-50 of oil, about 8-12 of filler, about 1-3.5 of elasticity increasing agent, about 25-40 of waste tire chips melting solution, about 0.5-1 of sulfur, about 0.05-1 of sulfur vulcanizing agent, about 0.1-0.4 of rubber antiaging agent, about 10-20 of bentonite, about 1-5 of water soluble high polymer resin by weight, respectively, and the process for the preparation of its manufacture.

The process for the preparation of asphalt waterproof composition containing waste tire chips and bentonite comprises three steps as follows: That is, three steps include (1) mixing and heating asphalt, oil, filler and surface-active agent at a temperature of about 150°-180°C to produce a jelly asphalt; (2) mixing the jelly asphalt with melting solution of waste tire chips, sulfur, sulfur vulcanizing agent, rubber antiaging agent at a temperature of about 150°- 180 ⁰ C to produce waste tire melting mixture asphalt waterproof solution; and (3) agitating the waste tire chips melting mixture waterproof solution with bentonite and water soluble high polymer resin.

In the first step, the asphalt can use usually use various types of asphalts such as straight asphalt, blown asphalt, natural asphalt, asphalt compound and cut-back asphalt, preferably straight asphalt, blown asphalt and cut-back asphalt.

At this time, the oil which combines with the asphalt is usually mineral oil, animal and vegetable oil, and synthetic oil. In the above oils, it is preferably mineral sprit oil and hydrocarbon oils such as aromatic oil, naphthane oil and paraffin oil. Also, other oils such as aliphatic metal salts of calcium rosinate, sodium rosinate and

sodium oleinate, glycols of ethyleneglycol, proyleneglycol and glycerin, and Vaseline can be used. Sometimes, waste oils of the above oils can be used.

Particularly, in first step of the process for the preparation according to the present invention, the preferable heating temperature is about 160-170 ⁰ C and the preferable weight ratio is about 12-13 of asphalt, about 30-40 of oil, about 6-10 of filler, about 2-2.5 of elasticity increasing agent, about 0.2-0.3 of surface-active agent by weight, respectively.

In second step of the process for the preparation of asphalt waterproof composition containing waste tire chips and bentonite, the waste tire chips melting solution is pyrolyzed by heat alone at a temperature about 150°-180°C to extract styrenebutadiene rubber having carbon black. The waste tire chips melting solution contains blocking material which can cut off internal oxidation and ultraviolet rays, so that the jelly asphalt combined with waste tire chips melting solution possesses durability thereof. The waste tire chips melting solution is produced by heating waste tire chips and lubricating oil in a reactor at a temperature of about 200°-500°C, preferably 310 ⁰ C.

Also, in second step of the process of the present invention, about 0.5-1 by weight of sulfur adds to the jelly asphalt produced from the above first step. At this time, sulfur vulcanizing agent is zinc oxide, stearic acid and oleic acid, and rubber antiaging agent is amines and phenols for improving heat-resistant and weather-resistant of the final product of the present invention.

Particularly, in second step of the process for the preparation according to the present invention, the preferable weight ratio is about 30-35 of waste tire melting solution, about 0.7-0.8 of sulfur, about 0.07-0.8 of sulfur vulcanizing agent, about 0.2-0.3 of antiaging agent by weight, respectively.

In third step of the process for the preparation of asphalt waterproof composition containing waste tire chips and bentonite, the high copolymer resin is a kind of water soluble resin which forms elastic water-resistant membrance after reacting with water. The high polymer resin is sodium acrylate gel, sodium polyacrylate, polyvinylalcohol as a hydrophilic high polymer (SAP), and polyacrylamides, and polyacrylesters as a water soluble high polymer condensing agent. At this time, the high polymer resin can be preferably used the above two resins selected from one of the hydrophilic high polymer (SAP) and one of the water soluble high polymer. Also, the above polymer condensing agent can be used positive ions, negative ions and nonions.

Bentonite in third step of the present invention is sodium bentonite which has high swelling capacity in water. That is, the bentonite having about 4-9 mm of the thickness of layer thereof and 1x10-8-1x10-12 cm/sec of the special coefficient can swell 13-16 times volume after reacting with water, after drying, the bentonite comes back to the origin volume. The bentonite can operate continuously the swelling and collapsing movement. In the third step of the process for the preparation according to the present invention the preferable weight ratio is about 13-17 of bentonite and about 2-4 of water soluble polymer resin by weight, respectively.

In order to control the swelling speed, the asphalt waterproof composition produced from the third step according to the present invention can be added about 1-5 by weight water soluble high polymer resin again to produce a product if needed. Thereafter, about 0.1-0.4 of rubber antiaging agent and 0.1-0.4 of rubber stabilizer by weight, respectively can be added to the above product if needed. Also, after third step of the present invention, about 0.1-1 of elastic and swelling speed controlling agent by weight can be added to the asphalt waterproof composition.

Accordingly, the asphalt waterproof composition containing waste tire chips and bentonite provide a many of advantages as follows. For example, the asphalt waterproof composition has an excellent waterproof power compared with conventional asphalt, urethanes and epoxy resins since the asphalt combined with the waste tire melting solution and bentonite of the present invention produces a high elastic jelly product. The final product has high cohesive power and does not harden after constructing it on the floor due to oil when compared with the conventional asphalt which is hardened after constructing it on the floor. If the constructed present asphalt composition is cracked, come undone from the floor and passed through by nails, can be immediately remedied by the swelling and drying operation of the bentonite and water soluble high polymer resin, repeatedly.

The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.