JPH02158670A - Conductive and heat-insulation type water-proof coating agent - Google Patents

Abstract

PURPOSE:To obtain the title water-proof coating agent in which almost all of carbon filaments are in contact with one another whereby electric wave troubles are avoided with excellent heat insulation maintained by dispersively blending carbon monofilaments with an organic solvent solution of butyl rubber and an isocyanate compound. CONSTITUTION:A main water-proof coating agent which is composed of a solution of butyl rubber of less than 40 mesh particle sizes in an organic solvent such as toluene, when needed, natural rubber, silica sand is mixed with an isocyanate compound as a curing agent (e.g. diphenylmethane diisocyanate) in an amount of about 3 to 4%, and in addition, with carbon filaments dispersed whereby the objective water-proof coating agent is obtained.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to waterproofing of rooftops, floors, walls, etc., acid-resistant coating of concrete and metal, coating to prevent radio wave interference in buildings, waterproof coating that can retain heat when energized, etc. This article relates to a current-carrying and heat-retaining waterproof coating that can be used in a wide range of fields.

(Prior art) Butyl rubber has ozone resistance, aging resistance, weather resistance, airtightness, heat resistance, il! Many molded products are known because they have excellent properties such as gas insulation, chemical resistance, shock absorption, abrasion resistance, elasticity, tension resistance, and waterproofness.

Due to these properties, attempts have been made to use it as a waterproof coating, but when applied as a solution, the adhesion to the substrate, tensile strength, weather resistance, and abrasion resistance are fully satisfactory. What should have been done could not be changed, and in the end, the method used for waterproofing was to form butyl rubber into sheets and paste them with adhesive on site for waterproofing work.

As a result of repeated research into waterproof coatings that take advantage of the waterproof properties of butyl rubber and have excellent adhesion to substrates, tensile strength, weather resistance, and abrasion resistance, the inventor used an incyanate compound as a curing agent. The present applicant discovered that it is possible to obtain a waterproof coating material with excellent properties as described above by doing this.1 As previously disclosed in JP-A No. 63-81175, the present applicant has obtained a waterproof coating material consisting of a solution of butyl rubber in an organic solvent, and a curing agent. We have invented a waterproof coating characterized by comprising an isocyanate compound.

This waterproof coating is in solution form and can be applied directly to the construction surface, making it much easier to work with compared to conventional sheet construction, and moreover, creating a more complete waterproof coating efficiently. It has the characteristic that it can be formed.

(Problems to be Solved by the Invention) By the way, in the above-mentioned prior art, waterproofness, chemical resistance, #!
Although it has excellent adhesion properties, it cannot prevent radio wave interference when painted on buildings, and it has no heat retention properties, so it may not be suitable for cold regions, limiting its range of applications.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems.The present invention has been made to solve the above-mentioned problems. The carbon fibers are dispersed and mixed so that the majority of individual carbon fibers maintain contact with each other.

Adding natural rubber powder to the above waterproof coating main ingredient can increase the elasticity of the coating film, and adding silica sand powder can increase the hardness of the coating film, and these compounding agents can be used as needed. They can also be used together.

The butyl rubber constituting the main ingredient is dissolved in an organic solvent to form a solution, and the organic solvent is particularly preferably toluene or xylene.

Natural rubber powder is powdered natural rubber that has been vulcanized by a conventional method, and its particle size is preferably about 40 mesh or less for the performance of the coating film, and the addition rate is 10 to 25 mesh to the butyl rubber solution. (weight)%, preferably 15-2
0% is particularly preferred.

In addition, fine silica sand powder of 270 mesh or less is preferably used, and the mixing ratio is 5 to 5 to butyl rubber solution.
15% is preferred, and when added together with natural rubber powder, it is preferred that the addition rate of both does not exceed 25% relative to the butyl rubber solution.

It is preferable to add the isocyanate compound as a hardening agent in an amount of about 3 to 4% to the main waterproof coating material. Usually, about 540 cc of the main waterproof coating material in a 18Q can is added in advance to a separate container. It is convenient to prepare a product containing ~720 cc of incyanate compound, mix and stir the two, and apply the mixture at the construction site.

At this time, the curing reaction of the coating film starts about 1 hour after the start of mixing and stirring (at a temperature of 20° C.), and a water-resistant coating film is formed after about 3 hours.

However, at this stage, the strength of the coating film was still insufficient, and 2
After 4 hours, it will be strong enough to withstand walking, but it will take about 5 hours to get enough strength to install heavy objects or protrusions.
It takes about a day.

As the isocyanate compound used in the present invention, aromatic incyanates can be suitably used.

Specifically, diphenylmethane diisocyanate, p-phenylene diisocyanate, chlorophenyl diisocyanate, toluene diisocyanate, naphthalene diisocyanate, etc. are used, and diphenylmethane diisocyanate is particularly preferably used.

In the present invention, carbon single fibers are further dispersed and mixed into the above-mentioned waterproof coating material, and the majority of each carbon single fiber maintains contact with each other to provide electrical conductivity and heat retention by heating with one electric current. In addition to being waterproof, chemical resistant, and insulating, when painted on buildings, it can prevent radio wave interference, and when used in cold regions, it can be used to coat buildings that can melt snow, greatly expanding the range of applications. It is something.

(Example) 1000 g of a butyl rubber stock solution is dissolved in 400 flashes of toluene and thoroughly stirred to prepare a toluene solution of butyl rubber. Approximately 42 cc of diphenylmethane diisocyanate is mixed with this waterproof coating base material and quickly stirred. This waterproof coating has a length of 3++o.

5 g of carbon single fibers with a thickness of 10 to 18 μm, 20 g of carbon black, and other pigments Log are dispersed and mixed uniformly with stirring. The electrically conductive and heat-retaining waterproof coating material thus obtained was applied to an asbestos board to a thickness of approximately 2 ounces and a current of 100 volts was applied to both ends, resulting in a temperature of approximately 30 degrees Celsius after 15 minutes.

In addition, a higher current carrying effect can be obtained by mixing metal powder such as aluminum powder or iron powder.

Claims (1)

[Claims] Carbon single fibers are dispersed and mixed into a waterproof coating material consisting of a waterproof coating main agent consisting of an organic solvent solution of butyl rubber and an isocyanate compound as a hardening agent, so that the majority of each carbon single fiber maintains a state of contact with each other. A current-carrying, heat-retaining waterproof coating.