JPS6112752A - Tire-ground rubber-incorporated self-hardening rubber asphalt waterproof material - Google Patents

Abstract

PURPOSE:To obtain the titled highly elastic waterproof material suitable for use in thick-coatable coating film waterproof layers or injection packing, by incorporating a rubber asphalt emulsion with tire-ground rubber prepared by impregnation with emulsion retarding coagulant aqueous solution followed by drying. CONSTITUTION:The objective waterproof material can be obtained by incorporating (A) 100pts.wt. of a rubber asphalt emulsion, pref. one prepared by mixing anionic asphalt emulsifier (with a solid content 45-72wt%) and 3-30wt% of synthetic rubber latex (with a solid content 45-60wt%, pref. from styrene-butadiene rubber) with (B) 50-300pts.wt. of waste tire-ground rubber prepared by impregnation with emulsion retarding coagulant (pref. sodium silicofluoride or potassium silicofluoride) aqueous solution pref. containing spreading agent followed by drying. The amount of said retarding coagulant to be used is normally 0.5-10wt% based on the component (A), depending on the self-hardening degree of the objective material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-hardening rubber asphalt waterproofing material containing crushed tire rubber that has high elasticity and is suitable for coating waterproof layers that can be coated thickly or for injection filling, and particularly relates to a method for solidifying the same. 0 The "emulsion slow coagulating agent" referred to here is a slow coagulating agent that completely destroys the emulsion state, separates water, and coagulates, and is slow and takes several minutes or more, and is also called a delayed coagulating agent.

For example, sodium silifluoride, potassium silifluoride, formic acid, ammonium formate, magnesium siolate, iron sierate, and magnesium chloride.

These are magnesium sulfate, iron alum, and aluminum sulfate. (On the other hand, "coagulants" are strong acids, calcium chloride, calcium nitrate, cyclohexylamine, etc. that completely destroy the emulsion state and separate water.) "Spreading agents J are calcium caseinate, Water-soluble polymers such as lignin sulfonate, methyl cellulose, carboxymethyl cellulose, polyhydroxylethyl cellulose, powder, gelatin, rosin soap, and hydrated sulfur vinyl alcohol, which are often used for spraying agricultural chemicals. It is.

Conventionally, there are waterproof paving materials for tennis courts and the like that are made by mixing asphalt emulsion with rubber powder, but if you apply one thick coat at a time, the interior will be difficult to dry and will cause blistering, so it must be applied in several thin coats. It requires a lot of manpower and time.

There is also a method of spraying a rubber asphalt emulsion and a coagulant (calcium chloride, calcium nitrate, etc.) at the same time to instantly form a waterproof coating, but this causes pollution due to the scattering of the rubber asphalt and limits where it can be applied. In addition, it is difficult to form a uniform coating on the protruding parts, protruding corners, and large corners of the base, and there is a drawback that the coating film becomes porous when sprayed with rubber powder.

There is also a waterproofing layer formation method in which a slow coagulating agent as mentioned above is mixed with the rubber asphalt emulsion, but slow coagulating agents are also called delayed coagulating agents, and are usually applied after a delay of several minutes to several tens of minutes. Coagulation begins, but once coagulation begins, it hardens rapidly. Moreover, the solidification start time is greatly affected by the temperature, which causes many problems during work. Particularly in this case, if the loose solid agent is added in the asphalt emulsion containing all the rubber powder in the form of powder, the dispersion will be poor and uniform coagulation will not be obtained, and if the loose solid agent is used in an aqueous solution, the coagulation will be too sensitive. The solidification start time is greatly influenced by small changes in temperature, making it difficult to work and not being able to obtain a waterproof coating film of uniform thickness.The present invention has the drawbacks that it is difficult to obtain a waterproof coating film of uniform thickness. By improving the drawbacks of ■ rubber asphalt waterproof coating film with excellent elasticity made by adding crushed tire rubber to rubber asphalt emulsion, ■ it is possible to apply a thick layer of several nanometers or more at a time, and ■ it is possible to solidify the coating film. The coating progresses gradually and is not affected by changes in temperature.It requires less money, ■Easy to apply and can obtain a coating film of uniform thickness, and ■Low-cost self-hardening property suitable for injection filling. It is intended as a waterproofing agent.

Immediately, (A) Com Asphalt Emulsion,! = (
B) A self-hardening rubber asphalt waterproofing material containing crushed tire rubber, which is characterized in that it is mixed with crushed tire rubber that has been impregnated with an aqueous solution containing an emulsion slow coagulant and a spreading agent added thereto if necessary. It exists in

Comb asphalt emulsion (N is particularly anionic asphalt emulsion (solid content: 5 to 72
Anionic asphalt emulsions prepared by mixing 3 to 30% by weight of synthetic rubber latex (solid content pt to 60% by weight) with (by weight) are suitable for use with other cationic and nonionic biampholytic asphalt emulsions. Asphalt is easier to emulsify than that, and it can be emulsified with a small amount of anionic emulsifier. Therefore, it is easy to separate asphalt and water by coagulating with the slow coagulating agent, and uniform separation is possible, and the properties of the separated asphalt are good. Therefore, it is particularly preferable. However, other emulsions can also be used in the same manner by selecting an appropriate coagulant.

As synthetic rubber latexes, styrene-butadiene rubber, cloblene rubber, butadiene rubber, isoprene rubber, and acrylonitrile-butadiene rubber latex have good compatibility with asphalt, and have good ductility, toughness, heat resistance, and weather resistance.

The effect of improving waterproofness is remarkable and preferred.

If the rubber latex content is less than 3%, the effect will be small, and if it is more than 30%, the storage stability and workability will be poor, and the cost will be high. Preferably, the rubber latex is 70% of the asphalt emulsion.
−． 20% by weight is optimal for this purpose.

Crushed tire rubber is made up of highly elastic old tires that are crushed and crushed using a powerful crusher. When viewed under magnification, it has an uneven surface with ridges and a very large surface area. The present invention is characterized in that the crushed tire rubber is impregnated with and adhered to a slow coagulating agent.

That is, a tire in which the slow coagulating agent is impregnated into the four lobed parts of the crushed rubber and adhered to the entire surface by scattering, spraying, or immersing the crushed rubber in an aqueous solution of the slow coagulating agent at a desired concentration. A crushed rubber (B) is obtained. When used, when the rubber asphalt emulsion (A) and the above-mentioned crushed tire rubber (B) are combined, the loosening solidifying agent gradually dissolves from the surface coating part to the impregnated part of the crushed rubber, and gradually solidifies the emulsion. Therefore, it is possible to eliminate the disadvantages of rapid solidification that occur in the prior art, resulting in a uniform coating film formation.

The blending amount of the pulverizing comb (B) is in the range of 50 to 300 parts by weight per 00 parts by weight of the rubber asphalt emulsion (A), depending on the purpose of use of the waterproof material, thickness, elasticity, cushioning properties, cost, etc. It can be determined as appropriate. Sodium silifluoride and potassium silifluoride are particularly preferred as the loosening solidifying agent. For example, when used as a total aqueous solution, rubber asphalt emulsion (0.5' to tθ weight % of This amount is determined depending on the conditions at the construction site, such as the degree of self-hardening of the target self-hardening rubber asphalt waterproofing material, the speed of coagulation, etc. Usually, about 2 to 6% is optimal.

As mentioned above, the spreading agent is a water-soluble polymer with paste-like properties that acts to spread the coagulant uniformly on the recesses and surface of the crushed rubber, and it adheres well to the water-detectable surface unique to crushed rubber.・
It is preferable because it impregnates the body.

In particular, since crushed rubber is made by crushing old tires with a crusher, it often contains oil and other substances that prevent uniform impregnation and adhesion of the aqueous solution of the loosening solidifier, so adding a spreading agent is particularly preferable when the rubber is very hot. . In addition, this spreading agent completely prevents the coagulant attached to the crushed rubber from drying and falling off during storage and transportation, and prevents the coagulant from being unevenly distributed and the self-hardening properties of the waterproofing material becoming uneven. Add and use.

With the structure of the present invention, (1) a coated waterproof layer or a filled waterproof layer with excellent elasticity and cushioning properties can be obtained by mixing tire pulverized comb with rubber asphalt emulsion.

■Using the characteristics of crushed tire rubber, it is impregnated with a slow coagulating agent and, if necessary, a spreading agent, and then mixed with the rubber asphalt emulsion to make it self-harden and coagulate, so coagulation progresses gradually and uniformly. A coating layer or filler layer with uniform thickness and properties can be obtained.0■ No matter how thick it is applied at once, it will solidify uniformly, making it easy to work, save labor, and can be applied with high efficiency. A low-cost waterproof material can be obtained by using a large amount of rubber.

Example / (A) Rubber asphalt emulsion prepared by mixing 90 parts by weight of an asphalt emulsion emulsified with an anionic surfactant and IO parts by weight of anionic SBR latex (B) An aqueous solution containing parts by weight of silicofluoride soda 700 parts by weight of crushed old tire rubber (
Particle size 10-! (rO mesh) (A), (B)e When the mixed and prepared self-hardening waterproofing material was applied to a total concrete board to a thickness of 5 m, (room temperature, 2j "ψ
Coagulation started 5 minutes after preparation and finished 3 hours later, yielding a rubber asphalt waterproof layer with uniform elasticity throughout.

The application work was easy.

Example (A) Rubber asphalt emulsion prepared by mixing 10 parts by weight of an asphalt emulsion emulsified with an anionic surfactant and 0 parts by weight of nonionic chloroprene rubber latex (B) 7 parts by weight of potassium silicofluoride, calcium caseinate/
Crushed old tire rubber that was dried after being uniformly impregnated with an aqueous solution of parts by weight - ○○ parts by weight (particle size 10 to jQ messier) (A), (B) Self-hardening waterproofing material f prepared by completely mixing When the mixture was injected and filled between two slate wall plates spaced apart by 10 squares, full setting started 5 minutes after preparation (at room temperature 1O'C) and finished 7 hours later.The filled intermediate waterproof layer set uniformly. There were no lumps or the like, and a low-cost waterproof layer with high elasticity and cushioning properties was obtained, which was blended with a large amount of crushed old tire rubber.

Claims (1)

[Scope of Claims] 1. (A) Rubber asphalt emulsion (B) Emulsion Crushed tire rubber impregnated with an aqueous solution containing a slow coagulating agent and a spreading agent added, if necessary, and dried. The above (A) and (B) are mixed. A self-hardening rubber asphalt waterproofing material containing crushed tire rubber. 2. Self-hardening rubber containing crushed tire rubber according to claim 1, characterized in that 50 to 300 parts by weight of crushed tire rubber (B) is mixed with 100 parts by weight of the rubber asphalt emulsion (A). Asphalt waterproofing material. 3. Rubber asphalt emulsion (A) is an anionic asphalt emulsion (solid content 45 to 72 wt%) and synthetic rubber latex (solid content 45 to 60 wt%).
The self-hardening rubber asphalt waterproof material containing crushed tire rubber according to claim 1, which is a mixture of 0% by weight.