KR100225453B1 - Method for coating inorganic binder from rubber powder and product thereof - Google Patents

Abstract

The present invention relates to a method and a composition for increasing adhesion between waste rubber powder and cement paste in mortar and concrete to which waste rubber powder is added, and the waste rubber is pulverized into small particles and impregnated in water-soluble latex. Or spraying the water-soluble latex to form an adhesive layer on the surface of the pulverized waste rubber powder, and then coating the inorganic binder on the other surface, and the inorganic binder coated rubber prepared by the method.

Description

Inorganic binder coating method and preparation on rubber powder

The present invention relates to a method and a preparation thereof in which rubber powders injected into composite mortar and concrete can improve adhesion with cement paste.

In recent years, as the amount of automobiles in Korea has rapidly increased, the amount of waste tires has been greatly increased, but proper disposal measures for waste tires have not been devised, which has been left unattended or illegally treated, causing damage to the environment.

In other words, waste tires are not decayed even if they are buried underground, and in the rainy season, the waste tires can block the vein layers that are smeared underground, which can cause the ground vein to fluctuate and sink the ground. There is also a problem that is difficult to secure the place for handling this.

In recent years, waste tires have been recycled or recycled as playground equipment, but the consumption is extremely low, and the cumulative amount continues to increase as most of them are untreated. Therefore, it is urgently needed to develop a field that can be recycled in large quantities. As a result of the addition of 2 to 10% of the pulverized powder, it was invented to obtain a mortar having excellent thermal insulation and sound absorption properties. This technique is as described in 1995 Patent Application No. 7340 filed by the applicant of the present application.

When using the mortar or concrete in which the rubber is extracted by crushing the waste tire as described above, it reduces the occurrence of cracks, and exhibits effects such as shock mitigation, noise reduction, and so on. When used as a flooring material in the lower part of the machine, such as vibration occurs, it is possible to prevent cracks and absorb shocks to obtain a dustproof effect.

However, the above mortar and concrete composition has excellent effects such as impact mitigation and noise reduction, but the rubber powder has low adhesive strength with the cement paste, which is a defect in the interface between the rubber powder and the cement paste even after curing, thereby reducing the compressive strength and the bending strength. There were problems such as being let down.

The present invention is to solve the above problems by coating an inorganic binder on the surface of the rubber powder to increase the adhesion to the cement paste.

Another object of the present invention is to provide a mortar and concrete that is significantly improved in the compression strength and bending strength when curing using the composite mortar as described above and does not generate cracks after curing.

Another object of the present invention is to use waste tires as construction materials to protect the nature by using waste resources to reduce the waste of resources and to prevent environmental destruction by landfill or incineration.

The present invention for achieving the above object is a process of finely pulverizing only the rubber powder in the state in which the wire and the fiber is separated from the waste tire and a process of applying a water-soluble latex to the surface of the rubber powder produced by the process and Characterized in that the process consists of coating the cement on the surface.

Another feature of the invention is characterized in that the organic adhesive layer is formed on the surface of the powdered rubber and the inorganic binder coating layer is formed on the surface of the adhesive layer.

Hereinafter, an embodiment of the present invention will be described in detail.

First, separate and remove the synthetic fibers such as steel wire, polyester, and nylon from the waste tires, and then crush only the rubber to an appropriate size. The process first fragments the waste tires using a freezing shock method using liquid nitrogen into small pieces. After dividing it, it is milled with a drum mill and ground to an average particle diameter of about 0.2 to 10 mm to be powdered.

Of course, the fragmentation process may be performed by using a known mechanical means such as a crusher or a scratcher.

In the above process, the rubber is extracted from the waste tire and pulverized because the waste tire can be easily obtained from the surroundings, and it is obvious that waste rubber of other materials can be used.

In order to form an adhesive layer for adhering the inorganic binder to the surface of the rubber powdered by the above process, the powdered rubber is precipitated in a water-soluble latex bath to form a latex layer on the surface of the rubber powder. In the above example, a method of precipitating in a latex bath was used to form an adhesive layer, but the process of forming an adhesive layer may be applied to the surface of powder rubber by using a sprinkler, and such a method is well known. Is omitted.

At this time, the latex used is water-soluble latex, 20 to 70% of the aqueous solution using a number of experiments have been proved that it is preferable to use 50% of the aqueous solution.

The latex-coated rubber powder is conveyed by a conveying device such as a conveyor by the above process, and the rubber powder and the cement, which is an inorganic binder, are added together in a stirrer while stirring. In this process, cement made of fine powder on the surface of the rubber powder adheres to the surface of the rubber by the adhesive force of latex on the rubber surface and is coated.

In the above embodiment, cement was used as the inorganic binder, but it is obvious that other inorganic binders such as fly ash may be used.

Thereafter, to prevent the inorganic binder from being separated from the rubber powder, a water-soluble coating film is formed on the surface. Even when cement is used as the inorganic binder, water may be sprayed on the surface to induce surface strengthening.

Thereafter, the inorganic powder is coated with a rubber binder coated with a conveying device such as a conveyor, or an appropriate amount of the rubber powder is packaged by stirring with a remittal. The remaining inorganic binder is attached to the surface of the rubber powder in the stirrer during the transfer process To be reused separately.

When 2 to 10% by weight of the inorganic binder-coated rubber powder is mixed with mortar or concrete, the water-soluble coating film is dissolved on the surface by the mixed water, and then the cement is mixed with the mortar or concrete to increase the compressive strength and the bending strength. In addition, the crack of the material is suppressed by the elasticity of the rubber inside, and it has the effect of reducing the impact and noise.In this case, as the amount of rubber powder is increased, the crack prevention effect, impact mitigation effect, and noise reduction effect are enhanced, but the compressive strength Since flexural strength is reduced, it is preferable to adjust the mixing amount suitably according to a use.

The compressive and flexural strengths of the specimens cured in water by mixing 5% by weight of rubber with remittal are shown in the table below.

TABLE 1

□ LC: After cementing rubber powder in latex for 24 hours, take out cement powder,

□ R: Rubber powder before coating

□ N: Remital as it is

□ W: Water and Cement Ratio (%)

□ 100, 50, 25: Dilution ratio of latex to water (%)

□ Remarks is the value expressed as percentage when N compressive strength and flexural strength are expressed as 100.

As shown in the table above, in the case where only the rubber powder is mixed into the remittal, the compressive strength and the bending strength are significantly reduced even if the same amount of rubber is mixed, but the same amount coated with the cement powder of the present invention is mixed. In this case, it can be seen that the compressive strength and the flexural strength increased significantly. This improves the strength of the remittal, since cement cemented on the rubber surface improves adhesion with the remittal and increases the amount of cement included.

As described above, according to the present invention, rubber was extracted from waste tires, but the same effect is obtained by using other rubbers and waste rubbers, and waste resources are usefully used by incorporating waste rubbers into building finishing materials. In addition to protecting nature, when used in combination with remittal, it has the effect of reducing impact and reducing noise, and it is possible to manufacture excellent building structures with high compressive strength and high bending strength.

Claims (1)

Waste rubber is frozen in a liquefied nitrogen atmosphere to apply output, and then subjected to papenization, milled with a drum mill to finely pulverize the powder, and the rubber powder produced by the above process to a 20-70% aqueous latex bath. Precipitating and applying an adhesive layer on the surface of the rubber powder, and putting a stirrer on the surface to coat the inorganic binder before the water-soluble latex is solidified in the fixing, and forming a water-soluble coating layer on the surface of the inorganic binder. Inorganic binder coating method on the rubber powder.