JPS582356A - Butyl rubber based coating compound - Google Patents

Abstract

PURPOSE:The titled economic coating compound for low-temperature insulation and lagging of a tank, having improved water resistance, moisture resistance, and fire resistance obtained by one coating, reducing the number of processes, prepared by blending butyl rubber as a vehicle with thermally expanding graphite. CONSTITUTION:(A) 100pts.wt. butyl rubber (preferably one having molecular weight of 10,000-100,000 and a degree of unsaturation of 0.5-10mol%) is blended with (B) 1-100pts.wt. thermally expanding graphite and (C) preferably 0.1-20pts.wt. thermally expanding graphite and (C) preferably 0.1-20pts.wt. asbestos to give the desired coating compound. USE:A coating compound having water resistance and moisture resistance for providing a piping system with fire resitant properties.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a waterproof and moisture-proof paint that has fire retardant properties and is used for purposes such as keeping tanks cool and warm.

Outdoor storage tanks that use hard foam foam as a heat insulator are +11 from the perspective of disaster prevention.A waterproof layer made of a butyl rubber coating is formed on the outer surface of the foam foam, and (2) a fireproof layer is formed on the outer surface of the waterproof layer. Form a coating layer, (3
) The outer surface of the fireproof coating layer is required to be painted with an exterior paint.

However, it is disadvantageous in terms of process to provide as many as five coating layers on the Fretan foam, and simplification is strongly desired, but it is not safe to use two coating layers. From this point of view, it has yet to be realized.

The present invention solves these problems.

The butyl rubber-based paint of the present invention is one in which butyl rubber is used as a vehicle and thermally expandable graphite is blended, and more preferably, it is formed in a butyl rubber vehicle and thermally expandable graphite and asbestos are blended.

In addition to maintaining sufficient waterproof and moisture-proof properties, these paints also have excellent fire retardant properties, so what used to require two layers of painting, a waterproof layer and a fireproof layer, can now be applied in one layer. Since the purpose is achieved, one step can be completely omitted, which is extremely advantageous economically.

The butyl rubber used in the present invention has a molecular weight of 10,000 to 100,000 and a degree of unsaturation of 0.5 to 10 mol. If the molecular weight is too small, the tensile strength and other mechanical properties of the coating film will be poor; if the molecular weight is too large, the melt viscosity of the resin will become too high. If the degree of unsaturation is too low, the concentration of crosslinking points will be low and the mechanical properties will be poor; if the degree of unsaturation is too high, the weather resistance and moisture resistance will be poor. Particularly preferred ranges are a molecular weight of 20,000 to 40,000 and a degree of unsaturation of 2 to 5 mol.

Oxidation treatment or electrolytic oxidation of thermally expandable graphite melted graphite powder,
It is obtained by washing with water and drying.

Although the blending ratio of thermally expandable graphite to butyl rubber can vary widely, it is preferably 1 to 100 parts by weight, particularly 2 to 50 parts by weight, per 100 parts by weight of butyl rubber. If the amount of thermally expandable graphite blended is too small, the desired fireproofing properties will not be achieved, while if it is too large, the mechanical strength and elasticity of the coating film will be insufficient.

In the present invention, it is preferable to use asbestos together with thermally expandable graphite. If only thermally expandable graphite is added, the thermally expanded graphite will peel off when the paint film is exposed to flame, reducing the effect of preventing flame penetration, but when asbestos coexists, the thermally expanded graphite will effectively prevent the peeling off. Moreover, since asbestos itself has fire retardant properties, it effectively prevents the penetration of flames. Although the blending ratio of asbestos to butyl rubber can vary widely, it is preferably 0.1 to 20 parts by weight, particularly 1 to 5 parts by weight, per 100 parts by weight of butyl rubber. If the amount of asbestos is too small, flame spraying will lack the effect of preventing flaking of thermally expanded graphite, while if it is too large, the fluidity of the paint will be poor and the elasticity of the paint film will be insufficient.

In addition to the above-mentioned butyl rubber, thermally expandable graphite, and asbestos, the paint of the present invention contains cross-linking agents (paraquinone dioxime, etc.), flame retardants (haloken-based, phosphorus-based, antimony trioxide, etc.), coloring pigments, and extender pigments. , solvents (hydrocarbon solvents, etc.), metal soaps, plasticizers, stabilizers, and curing catalysts (organic peroxides, inorganic peroxides, etc.) can be blended.

The butyl rubber-based paint of the present invention is particularly useful as a waterproof and moisture-proof paint for tanks and piping systems, and can also be used as a paint for various other base materials.

Next, the coating material of the present invention will be further explained by giving an example.

Hereinafter, "parts" and "ch" are expressed on a weight basis.

Example 1 A paint with the following formulation was prepared.

Toluene 150 parts Paraquinone dioxime 5.5 parts Thermally expandable graphite 25 parts Asbestos
1.5 parts antimony dioxide 10 parts chlorinated paraffin (chlorine content 70%) 20 parts naphthenic salt copalt (cobalt content 6%) L5 parts titanium dioxide
60 parts talc
After adding and mixing 5 parts of [-butyl perbenzoate] as a hardening agent to 100 parts of the main coating material, a thickness of 4
ITQp'-1 was applied to cod plywood and dried.

Punch-through test (flame temperature 108
The temperature was 0°C and the distance between the burner and the painted surface was 25fi. The surface exposed to the flame turned black but did not peel off, and it took 65 minutes for the back side of the painted board to turn black.

Comparative Example 1 A paint was prepared and applied in the same manner as in Example 1, except that the addition of thermally expandable graphite and asbestos was omitted, and the amount of talc was increased to +26.5 parts. It took only 2 minutes for the back side of the painted board to turn black.

Example 2 An experiment was conducted in the same manner as in Example 1, except that only the addition of asbestos was omitted at t7. In the burn-through test, peeling was observed on the side exposed to the flame, but it took a long time of 50 minutes for the back side to turn black.

Example 5 A silicone release agent was applied to a stainless steel plate, and a hard foam layer of 25 cm thick was formed thereon using an airless sprayer.The stainless steel plate was removed and only the foam layer was taken out. Next, a paint with the formulation of Example 1 was applied to I KIF/m' using an airless sprayer and dried, and a modified olefin rubber finish paint was applied on top of this using an airless sprayer and dried. .

Next, I set it up so that the finished painted side faced the flame, and layered a piece of paper on the back, and did a punch-through test. The time it took for the flame to penetrate one piece of paper on the back was 40 minutes after opening at 2:00, satisfying the Fire and Disaster Management Agency notification standard (2 hours or more).

The burn-through test result when using the paint with the formulation of Example 2 was 2 hours and 10 minutes.

Claims (1)

[Scope of Claims] 1. A butyl rubber paint comprising butyl rubber as a vehicle and thermally expandable graphite. 2. The paint according to claim 1, wherein the amount of thermally expandable graphite is 1 to 100 parts by weight per 100 parts by weight of butyl rubber. 3. The paint according to claim 1, wherein the amount of thermally expandable graphite blended is 2 to 50 parts by weight per 100 parts by weight of butyl rubber. 4. The paint according to claim 1, which contains butyl rubber as a vehicle and contains thermally expandable graphite and asbestos. 5. The content of thermally expandable graphite is 1 to 100 parts by weight per 100 parts by weight of butyl rubber, and the content of asbestos is 0.1 to 20 parts by weight per 100 parts by weight of butyl rubber. paint.