KR20080102791A

KR20080102791A - Expandable fireproof coating

Info

Publication number: KR20080102791A
Application number: KR1020070049691A
Authority: KR
Inventors: 김충엽
Original assignee: 주식회사 부일건화
Priority date: 2007-05-22
Filing date: 2007-05-22
Publication date: 2008-11-26

Abstract

Expandable fireproof paints are provided to ensure an effect on blocking flame and heat, to solve the problem of bursting into eruption of the foaming film by forming a carbonized resin-graphite pigment composite as a fire retardant layer. Expandable fireproof paints(2) is added with expandable graphite pigment as pigment to the normal flame resistant paint including pigment, resin, flame retardant and aid. The expandable graphite pigment is contained in 5 ~ 30 weight% based on the total fireproof paint. The flame retardant is contained in 3 ~ 20 weight% based on the total paints.

Description

Expandable fireproof coating

Figure 1a is a view schematically showing the form of the foam coating film formed when a flame is applied to the coating material to which the conventional fire-resistant paint is applied,

Figure 1b is a view schematically showing the form of the hydrocarbon-graphite pigment composite fire protection layer formed when a flame is applied to the coating material to which the fire protection paint is applied according to the present invention,

Figure 2 shows the actual micrograph of the carbonized resin-graphite pigment composite fire protection layer produced when the heat applied to the iron plate coated with the fire-proof paint of the present invention.

The present invention relates to a fire-retardant paint, and more particularly, to an expandable fire-retardant paint that contains a predetermined amount of an expandable graphite pigment in the paint to expand the carbonized resin-graphite composite on the surface of the object to form a dense fireproof film and to exhibit excellent fire protection performance. .

Fire-retardant paint refers to a paint that is applied to combustible materials such as wood or plastic to prevent ignition or delay ignition time. There are two kinds of such fire retardant paints: flame retardant materials and foamed when heated to form a barrier layer between the combustible materials to block the flame and delay the conduction of heat. The former is made by adding various pigments or non-flammable powders to flame retardant materials such as water glass, various flame retardant or non-flammable resins, and chlorine compounds. The latter is made of synthetic resins as binders, various fire-retardants, foaming agents, and heat-insulating carbon forming agents. It is to delay the transfer of flame and heat to the combustibles by forming pyrolysis of the coating film by heating using a carbonation accelerator, a carbonation accelerator, etc. to generate a non-combustible gas, and forming a foamed insulating layer in the shape of a sponge of several cm thickness.

Fire protection paints of the present invention belong to the latter, the conventional fire protection paints belonging to this classification, when the flame contacting the coating film, the coating film components are physically and chemically changed by heat, and the coating film swells by foaming, expansion, etc. in a carbonized state, It is to protect the burned material (flammable material) from being burned by flame and heat.

In other words, the currently used foam fire-retardant paint is a coating (components) in the coating component acts as a protective film to form a carbonized foam film that swells like a sponge by the action of specific pigments, additives, etc. added to the paint. In this case, the foaming film is non-uniform, and the foamed coating film is likely to burst, and thus, the coated material is easily burned. Therefore, there is a problem in that the coating film on which the fire protection coating is applied is applied very thick, at least 1 mm or more and about 3 mm or 5 mm thick.

The present invention has been made in view of the above point, and an object of the present invention is to provide a completely new type of expandable coating film, which has not been hitherto, to overcome the disadvantages of the fire-proof coating by the thermal insulation mechanism by the conventional foam coating. It is to provide paint.

Expandable fire-retardant paint according to the present invention for achieving the above object is a conventional fire-retardant paint comprising a pigment, a resin, a flame retardant and other additives, wherein the pigment is an expandable graphite pigment for the entire paint 5 ~ 30 It is characterized by comprising a weight percent.

As described above, the new type of expandable fire retardant paint has a thickness of about 0.3 mm to 0.5 mm, in addition to a binder that is flame-retarded with a flame retardant by expanding the expanded graphite pigment mixed in the coating film by heat when the flame contacts the coating film. Twisting elevated carbonized resin-graphite pigment composite of 5 ~ 20㎜ forms a very dense fireproof layer to block flame and heat. This eliminates the problem caused by the explosion of the foam film, as in the conventional fire-resistant paint which forms a foam film to block the flame.

In the fire retardant paint of the present invention, the extender pigment may include 1 to 10 wt% with respect to the whole paint, and the flame retardant may include 3 to 20 wt% with respect to the whole paint.

Furthermore, in the fire protection paint of the present invention, the resin is one or two selected from the group consisting of acrylic resin, vinyl resin, natural rubber latex, synthetic rubber latex, urethane resin, phenol resin, urea resin, melamine resin and epoxy resin. The above mixture may contain 30 to 70% by weight based on the entirety of the paint (based on 50% resin solids).

Hereinafter, the fire protection paint of the present invention will be described in detail.

Fire retardant paints are basically composed of pigments, vehicles, or resins and fire retarding agents (flame retardants, fire retarding agents), similar to general paints. Thickeners, dispersants, antifoaming agents, etc. May be added. A component that forms a coating film by fixing a pigment in a paint is called a colorant. In this field, a colorant is generally called a binder. Hereinafter, it will be referred to as a binder.

Fire protection paints of the present invention, like the general paint components as described above, include pigments, binders (colorants), flame retardants and other additives (dispersants, antifoaming agents, thickeners (precipitants), etc.), as a pigment, expandable graphite as the main fire protection component It includes 5 to 30% by weight based on the entire paint.

Since graphite does not sublimate even at 3350 degrees Celsius, it creates a very safe expansion shield for ordinary flames, and its scaly structure makes it more effective in blocking heat and flames.

Fire retardant paints of the present invention, including expandable graphite as a pigment, when the flame contacts the coating film expands the expanded graphite pigment mixed in the coating film by heat and is 0.3 mm to 0.5 mm thick with a binder that is flame retardant with a flame retardant, length 5 Twisted elevated carbonized resin-graphite pigment composite of ~ 20mm forms a very dense fireproof layer to block flame and heat. As will be described later, the blocking layer (carbohydrate-graphite pigment composite) formed by the fire protection paint of the present invention is not foamed spheres such as sponges as in the conventional fire protection paint, but is formed on the surface of synthetic leather (suede). Short fibers have a densely raised form.

This is represented schematically in FIG. 1. Figure 1a is a view showing the form of a foamed coating film 20 formed when a flame is applied to the coating (1) to which the conventional fire-resistant paint (2) is applied, Figure 1b is a coating material to which the fire-resistant paint (2) according to the present invention is applied Figure 1 shows the form of the carbonized resin-graphite pigment composite formed when a flame is applied. As shown in the figure, the foamed coating film 20 formed by the conventional fire protection paint 2 has a hemispherical shape due to the foaming of the coating film, but the fire protection layer formed by the paint of the present invention is short and twisted like a hair. A fleece is bulging toward the flame. Therefore, in the case of the present invention, the problem caused by the explosion of the foam film is solved, as in the conventional fire-resistant paint forming a foam film to block the flame.

The expandable graphite pigment used in the fire protection paint of the present invention is different from the non-expandable graphite pigment and is generally readily available on the market. Commercially available expandable graphite pigments include HCE-995270 and HCE-958020 which are commercially available from Hyundai Coma Industry.

Expandable graphite pigment in the present invention should contain 5 to 30% by weight based on the total weight of the paint. If the expandable graphite pigment is outside the above numerical range, the desired degree of fire protection performance is not exerted. The mixing ratio is suitably adjusted within the above range depending on the type of the workpiece and / or the type of other components, colorants or flame retardants to be mixed.

The fire protection paint of the present invention includes an extender pigment as a pigment component used in general paints. The extender pigment is a component that controls the state of the paint, that is, the viscosity, fluidity, nonvolatile matter in the paint, and the like, and is mixed in the paint of the present invention and is not related to the fire protection performance. The extender pigments that can be used are not limited, and extender pigments known in the paint field such as silica, talc, calcium carbonate, diatomaceous earth, kaolin, and the like can be used without limitation. In addition, various special pigments such as white and coloring pigments, rust preventive pigments, light-emitting pigments, and Zion pigments may be added depending on the application.

The binder used in the fire prevention paint of the present invention is not particularly limited and may be used alone or in combination with a general binder that can be used for the paint. For example, one or two or more mixtures selected from the group consisting of acrylic resins, vinyl resins, natural rubber latexes, synthetic rubber latexes, urethane resins, phenolic resins, urea resins, melamine resins, and epoxy resins may be used in the entire coating. 70% by weight can be used. The kind and component ratio of the binder which can be used can be suitably adjusted by a person skilled in the art according to the function or use of a coating material.

The coating of the fire protection paint of the present invention is the same as the general paint, but should be coated so that the dry film thickness is 0.2 mm or more. In general, the thickness is about 0.3mm ~ 0.5mm, the thicker the better the fire resistance.

The usable range of the component ratio of the fire prevention paint of the present invention is as follows.

Pigment part:

Expandable Graphite Pigment 5 ~ 30%

Flame Retardant 3 ~ 20%

Sieving Pigment 1 ~ 10%

White Pigment 0 ~ 10%

Resin part:

30 to 70% based on 50% solids

Other additives:

Thickener (2.5%) 1-5%

Dispersant (stock solution) 0.05 ~ 1%

Antifoaming agent (stock solution) 0.05 ~ 1%

Hereinafter, embodiments of the present invention will be described. The embodiments described below are for the purpose of understanding the present invention, but the present invention is not limited to the following examples.

Manufacture of Fire Retardant Paint

Acrylic resin emulsion (based on 50% resin solids): 44%

Expandable Graphite Pigment (HCE-995270, Hyundai Coma Industry): 15%

Phosphate Flame Retardant (Ammonium Polyphosphate, Universal Comtech): 5%

Melamine Flame Retardant (Melamine Sheathrate, Universal Comtech): 5%

Aluminum hydroxide: 5%

Talc (Ilshin Industry): 10%

Titanium Dioxide (R-902, DuPont): 5%

Dispersant (BYK154, BYK-Chemie): 0.5%

Antifoam (BYK028, BYK-Chemie company): 0.5%

Water: 10%

Fire protection performance

After preparing the paint with the composition as described above and coating it with a dry film thickness of about 0.5 mm on a thin paper of about 0.2 to 0.3 mm and drying it, the paper is pressed slightly without burning even after 5 minutes when burning the coated surface with a laboratory alcohol lamp. After heating for 10 minutes, 20 minutes, and 30 minutes, the combustion of paper did not occur.

As a result of measuring the temperature of the back of the iron plate while performing the same experiment as the paper on the 0.6 mm iron plate, the result was not more than 210 degrees Celsius for 30 minutes, and a micrograph of the coating film surface before and after heating was attached to FIG. FIG. 2A is a micrograph of a cross section of the coating film before heating, FIG. 2B is a front photograph of the coating film after heating, and FIG. 2C is a cross-sectional photograph of the coating film after heating. As can be seen in Figure 2, according to the fire protection paint of the present invention the twisted carbonized resin-graphite pigment composites form a very dense fire protection layer to block the flame and heat.

According to the fire retardant paint of the present invention described above has the effect of blocking the flame and heat to form a very dense fired carbonized resin-graphite pigment composite to form a very dense fire-proof layer, to form a conventional foam film to block the flame The problem caused by the bursting of the foam film as in the fire-resistant paint is solved, and it has a feature of producing a significant fire protection effect with a relatively thin film thickness.

Claims

In the usual fire-retardant paint containing a pigment, a resin, a flame retardant and an auxiliary agent,

The pigment is an expandable fire-proof paint, characterized in that containing 5 to 30% by weight of the expandable graphite pigments relative to the entire fire-proof paint.

The method of claim 1,

The flame retardant is an expanded fire-retardant paint, characterized in that containing 3 to 20% by weight based on the entire paint