KR20100133230A

KR20100133230A - Manufacture method of retardant paint containing graphite-oxide

Info

Publication number: KR20100133230A
Application number: KR1020090052014A
Authority: KR
Inventors: 김영식
Original assignee: 김영식
Priority date: 2009-06-11
Filing date: 2009-06-11
Publication date: 2010-12-21

Abstract

PURPOSE: A fire-resistant paint containing graphite-oxide is provided to form additional fire-resistant film by enabling graphite oxide mixed in the fire-resistant paint to be volume-expanded at the surface of a film. CONSTITUTION: A method for preparing fire-resistant paint containing graphite-oxide comprises (ST-100) blending 1~50 weight% kish graphite alone or a mixture of kish graphite and crystalline graphite, 0.01~15.0 weight% or less of dispersing agent, and the balance of oxide of ferric oxide or titanium dioxide to prepare graphite oxides; (ST-200) injecting 20 weight% -40 weight% graphite oxides into the whole fire-resistant paint; and (ST300) blending the graphite oxides and fire-resistant paint at 6000 rpm for 10 minutes.

Description

MANUFACTURE METHOD OF RETARDANT PAINT CONTAINING GRAPHITE-OXIDE}

The present invention relates to a method for manufacturing a fire-retardant paint to which graphite oxide is added, and in more detail, by mixing a graphite oxide that expands in volume when heated with a fire-retardant paint, the composition is further expanded in addition to the coating film of the fire-retardant paint by volume expansion upon surface heating after coating. The present invention relates to a method for preparing a fireproof paint to which a graphite oxide is added, which forms a fireproof film and performs a stable fire protection function even when exposed to a flame for a long time.

As is well known, fire-retardant paint refers to a paint that is applied to a combustible material 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 with a carbonization accelerator, carbonization accelerator, etc. to generate incombustible gas and foamed insulation layer foamed 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 binder (called a colorant) in the coating component to act as a protective film to form a carbonized foam film that swells like a sponge by the action of a specific pigment, 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 economic loss is large because the coating film on which the fireproof coating is applied must be applied very thick at least 1 mm or more to 3 mm or 5 mm thick.

In addition, even when the coating film of the fire-retardant coating is applied very thick, when exposed to a flame for a long time, there is a problem that the foamed film is carbonized and the coating film is broken, thereby losing the function as a fire-proof paint completely.

Therefore, in order to perform the function as a proper fire protection paint, it must be able to withstand flame for a longer time than the existing fire protection paint, and should be able to prevent the burning of the coating material even if the coating film of the foam film bursts.

The present invention has been made in view of the above-described state of the art. The present invention is made by mixing a graphite oxide which expands in volume with a fire protection paint, thereby forming a volume of the fire protection paint in addition to the coating film of the fire protection paint. It is an object of the present invention to provide a method for producing a fire-retardant paint to which the graphite oxide is added to perform a stable fire protection function even when exposed to a flame for a long time.

In order to achieve the above object, according to a preferred embodiment of the present invention (a) Kish graphite alone or a mixture of Kish graphite and impression graphite: 1 to 50% by weight, 0.01 to 15.0% by weight dispersant and the remaining iron oxide or titanium dioxide Preparing an oxide of graphite by combining oxides of the oxides; (b) injecting the graphite oxide into the fire protection paint in a range of 20% by weight to 40% by weight relative to the total fire protection paint; (c) there is provided a method for producing a fire-resistant coating material is added to the graphite oxide comprising the step of blending the graphite oxide and the fire-resistant paint at a rotation speed of 6000 rpm for 10 minutes.

Preferably, the fire prevention paint is a pigment part, flame retardant 3 to 20% by weight, sieving pigment 1 to 10% by weight, white pigment 0 to 10% by weight ;, as a resin part, 30 to 70% by weight based on 50% solids Wow; Manufacture of fire-retardant paint added with graphite oxide, characterized in that the paint is a mixture of 1 to 5% by weight of thickener (2.5%), 0.05 to 1% by weight of dispersant (stock solution), and 0.05 to 1% by weight of antifoaming agent (stock solution). A method is provided.

According to the present invention, the method for preparing a fireproof paint added with graphite oxide allows the graphite oxide mixed in the fireproof paint to expand further on the surface of the coating film to form an additional fireproof film even when the foaming film of the fireproof coating applied to the coating film is burst by a high temperature flame. Therefore, there is an advantage that the workpiece is not burned even when exposed to a high temperature flame for a long time.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail with reference to drawings.

1 is a process diagram illustrating a manufacturing process of a fireproof paint added with graphite oxide according to an embodiment of the present invention.

Referring to this, the fireproof paint to which the graphite oxide is added according to an embodiment of the present invention is formed by mixing the graphite oxide which expands in volume with the fireproof paint, thereby expanding the volume of the fireproof paint in addition to the coating film of the fireproof paint. It is a fire prevention paint that forms an additional fire protection film to perform a stable fire protection function even when exposed to a long flame.

More specifically, the fire prevention paint to which the graphite oxide is added according to an embodiment of the present invention is an additive to the existing fire protection paint, and the fire is such that the graphite oxide is expanded to form an additional fire protection film on the surface when the graphite oxide is mixed to deteriorate. Paint.

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 retardant paint to which the graphite oxide is added according to an embodiment of the present invention also includes pigments, binders (colorants), flame retardants and other additives (dispersants, antifoaming agents, thickeners (precipitation inhibitors, etc.), etc.) As an additional additive of the present invention only, it contains 15 to 20% by weight of the expanded paint as a component to form an additional fireproof coating film.

In general, graphite does not burn even at 3350 degrees Celsius, so that it forms a highly protective expansion shield in a general flame, and its scale-like structure makes heat and flame more effective.

However, in the case of general graphite, the fire resistance is excellent, but since the structure after foaming does not have fine denseness, there is a problem that the structure of the expansion volume is not uniform.

Therefore, the graphite oxide added to the fire protection paint to which the graphite oxide is added according to one embodiment of the present invention includes Kish graphite alone or a mixture of Kish graphite and impression graphite, a dispersant, and the remaining oxide.

At this time, the added oxide serves as a resistor, and oxides such as iron oxide and titanium dioxide are added, and as the binder, liquid sodium silicate or liquid silicate is added.

Kishu graphite alone or a mixture of Kishu graphite and impression graphite: 1 to 50% by weight

The graphite acts as a conductor in the conductive coating material, and the graphite usable in the present invention may be Kish graphite alone or a mixture of Kish graphite and impression graphite. The Kish graphite has good lubricity and has an excellent interlaminar structure, which is superior to that of impression graphite when the surface is treated with an oxide. Therefore, when the amount of oxide is increased, it is more preferable to use Kish graphite alone or to increase the weight ratio of Kish graphite / phosphorus graphite.

It is preferable to limit the addition amount of the Kish graphite alone or the mixture of Kish graphite and impression graphite to 1 to 50% by weight, and the above-mentioned for the average particle size of the Kish graphite particles or the average particle size of the mixture particles of Kish graphite and impression graphite It is preferable that the ratio of the average particle size of an oxide particle is 1 / 5-1 / 20.

The oxide included in the present invention acts as a resistor, and the kind thereof is not particularly limited. Representative examples of the oxide that can be used include iron oxide, titanium dioxide and the like.

Further, in the present invention, better surface properties can be obtained by controlling the ratio of the average particle size of the Kish graphite particles or the average particle size of the oxide particles to the average particle size of the mixture particles of Kish graphite and impression graphite. That is, in the present invention, when the particle size ratio is limited to 1/5 to 1/20, more excellent surface characteristics can be obtained, which is more preferable.

Dispersant: 0.01 to 15.0 parts by weight based on 100 parts by weight of the coating material composition

The dispersant is an effective ingredient for facilitating the dispersion of the particles, and typical examples thereof include carboxymethyl cellulose, sodium polyacrylate, and arabian gum. If the amount of the dispersant is less than 0.01 part by weight based on 100 parts by weight of the coating material composition, the storage stability may be lowered. When the amount of the dispersant is greater than 15.0 parts by weight, the coating property and workability may be lowered. It is preferable to limit the amount to 0.01 to 15.0 parts by weight.

Therefore, the noise is effectively blocked by the shape of the open cell, the flame retardancy is effectively exhibited by the graphite oxide contained in the fireproof paint to which the graphite oxide is added according to an embodiment of the present invention and the physical properties thereof do not change even in fire. And the generation of toxic gases is prevented.

Fire-retardant paint of the present invention is a pigment containing expandable graphite oxide as a pigment when the contact with the coating film expands the expanded graphite oxide mixed in the coating film by heat expands 0.3 mm to 0.5 mm thick with a flame-retardant binder, flame retardant The raised carbide-graphite oxide composite of about 5 to 20 mm forms a very dense fireproof layer that blocks flame and heat.

The barrier layer (carbon resin-graphite pigment composite) formed by the fire protection paint of the present invention is not a foamed sphere such as a sponge as in the conventional fire protection paint, but short fibers are densely raised on the surface of synthetic leather (suede). It takes the old form.

The expandable graphite oxide in the present invention is contained 20 to 40% by weight based on the total weight of the paint. When the expandable graphite oxide is out of the above numerical range, the desired degree of fire prevention 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, phenol resins, urea resins, melamine resins, and epoxy resins may be used in the entirety of the paint. 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. Generally, the thickness is about 0.3mm to 0.5mm, and the thicker it is, the better the fire resistance is.

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

Pigment part:

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%

It is composed of 20 to 40% of the expandable graphite oxidant as an additional additive.

Hereinafter, a method for preparing a fireproof paint to which the graphite oxide of the present invention is added.

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

Expandable Graphite Oxide: 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%

Manufacture of Graphite Oxide

Kishu graphite alone or a mixture of kishu graphite and impression graphite: 1 to 50% by weight, 0.01 to 15.0% by weight dispersant and the oxide of the remaining iron oxide or titanium dioxide is mixed to prepare a graphite oxide.

The graphite oxide is added to the fireproof paint in a range of 20% to 40% by weight of the total weight of the fireproof paint, thereby preparing a fireproof paint to which the graphite oxide according to the embodiment of the present invention is added.

After preparing the paint with the composition as described above and coating it with a dry film thickness of 0.5mm on a thin paper of about 0.2 to 0.3mm and drying it, the paper burns slightly without burning even after 10 minutes when burning the coated surface with a laboratory alcohol lamp. After 20, 30, 50 minutes of continuous heating did not occur paper burning phenomenon.

When the temperature of the back of the iron plate was measured while conducting the same experiment as the paper on the 0.6 mm iron plate, it did not exceed 210 degrees Celsius for 30 minutes.

On the other hand, the method for producing a fire-retardant paint to which the graphite oxide is added according to an embodiment of the present invention is not limited to the above embodiment, but various modifications can be made without departing from the technical gist of the invention.

Claims

(a) preparing a graphite oxide by mixing Kish Graphite alone or a mixture of Kish Graphite and Impression Graphite: 1 to 50% by weight, 0.01 to 15.0% by weight of a dispersant, and an oxide of the remaining iron oxide or titanium dioxide;

(b) injecting the graphite oxide into the fire protection paint in a range of 20% by weight to 40% by weight relative to the total fire protection paint;

(c) a method for producing a fire-prevention paint with graphite oxide, comprising the step of blending the graphite oxide and the fire-retardant paint at a rotational speed of 6000 rpm for 10 minutes.

The fire prevention paint of claim 1,

As a pigment part, 3 to 20% by weight of flame retardant, 1 to 10% by weight of extender pigment, 0 to 10% by weight of white pigment, and, as a resin part, 30 to 70% by weight based on 50% of solid content; Manufacture of fire-retardant paint added with graphite oxide, characterized in that the paint is a mixture of 1 to 5% by weight of thickener (2.5%), 0.05 to 1% by weight of dispersant (stock solution), and 0.05 to 1% by weight of antifoaming agent (stock solution). Way.