KR20030035280A - A fireproof urethane pannel and manufacturing method the same - Google Patents

Abstract

PURPOSE: A refractory urethane panel and its preparation method are provided, to improve the reinforcing property and the refractoriness of a urethane panel by adding expanded graphite, thereby allowing the urethane panel to be used as a reinforcement for a non-bearing wall. CONSTITUTION: The refractory urethane panel comprises 35-44 wt% of isocyanate; 35-44 wt% of polyol as a curing agent; and 12-30 wt% of a foaming inorganic material. Preferably the foaming inorganic material is expanded graphite. The method comprises the steps of inserting isocyanate, polyol and a foaming inorganic material into a supply tank, respectively, and maintaining the temperature to be constant; adding isocyanate, polyol and a foaming inorganic material to a bubbler and mixing them; putting the mixture into a mold before the dispersion polymerization is terminated in the bubbler and solidifying it; and cutting the solidified panel into a desired size. Preferably the panel mixture is solidified by cooling it under the atmospheric condition for 10 min or less.

Description

Refractory urethane panel and its manufacturing method {A fireproof urethane pannel and manufacturing method the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a urethane panel employed in a non-bearing wall system and a method for producing the same, and more particularly, to a fireproof urethane panel having improved flame retardancy to impart fire resistance.

In general, when constructing a non-bearing wall, a composite panel having heat insulation, soundproofing, waterproofing, and fireproofing, and having a fire resistance of 2 hours, is used. It is made by inserting an intermediate layer such as glass wool or rock wool.

Since the middle layer of glass wool or rock wool used in the composite panel has flame retardant properties, fire suppression can be achieved to some extent, but the poisonous gas is severe, which is a major cause of human injury, and the glass wool or rock wool is advantageous when used. Dust, such as powder or rock wool is blown has a problem that adversely affects the respiratory system of the human body.

In order to overcome the problems described above, a compression foam resin material having a heat insulating function may be embedded as an intermediate layer between gypsum boards, but in this case, there is a problem in that it is not suitable as a fireproof non-bearing wall.

In particular, as the compression foam resin material, a rigid polyurethane foam or a urethane-modified polyisocyanurate foam to which no flame retardant or fireproof material is added is used. Manufacture.

Typically, urethane compositions are known to have excellent abrasion resistance, impact resistance, weather resistance and chemical resistance along with excellent tensile strength, tear strength and high extensibility, and urethane compositions having these characteristics are used in textile, paper, vehicle, wood, industrial It is used as coating material or internal filler in the field of repair coating market.

However, the rigid polyurethane foam is classified as a flammable material according to DIN regulations, and when increasing the flame retardancy of the rigid polyurethane, the isocyanate forms a trimer only when the NCO / OH ratio is increased, thereby providing very good thermal stability. Can have.

The rigid polyurethane foam is mainly filled between the outer material forming the refrigerator and the plastic material, for example, polystyrene or ABS, to tightly connect the inside and the outside and to block heat. In addition, as in refrigerators, hot water tanks are also used as insulation to prevent heat loss from the surroundings.

The rigid urethane foam may be selected and used according to the use of interior and exterior materials such as sandwich panels in the construction field. In particular, factories, warehouses, freezers, etc. are used sandwich panels that require some strength. At this time, rigid polyurethane foam having a density of about 40 to 45 is used as a heat insulating material or a supporting member.

However, the general rigid polyurethane foam used for the above uses does not meet the Korean standard KS F 2271-1998 (Test method for flame retardancy of interior materials and structures of buildings), and polyurethane foam that meets these standards is not yet available. Nothing is produced until. In addition, the non-bearing wall should comply with the Korean standard KS F 2257 (Test method for the fire resistance of the structural structure part), but the above-mentioned rigid urethane foam does not meet the above standard and has not been applied until now.

Therefore, the present invention has been devised to solve the above problems, the urethane resin contained in the non-bearing wall is made of a porous panel, by adding expandable graphite to give the reinforcement and fire-resistant performance to be used as a reinforcing material of the non-bearing wall It is an object to provide a refractory urethane panel that can be.

1 is a block diagram of a refractory urethane panel according to the present invention.

* Explanation of symbols for main parts of the drawings

1: urethane panel 2: pore

3: expandable graphite

In order to achieve the above object, the present invention provides a refractory urethane panel composed of 35 to 44 wt% of isocyanate as a main material, 35 to 44 wt% of polyol as a curing agent and 12 to 30 wt% of an expandable inorganic compound.

In addition, the present invention is the first step of maintaining the polyol, isocyanate, expandable graphite in a predetermined temperature after filling the feed tank; A second step of mixing the isocyanate by 35 to 44 wt%, polyol 35 to 44 wt%, and expandable graphite at 12 to 30 wt% by mixing with a foaming machine; A third step of filling in a mold of a predetermined shape and solidifying for a predetermined time before dispersion polymerization of the reactants mixed and reacted in the foaming machine is completed; It provides a method for producing a refractory urethane panel comprising a fourth step of cutting into a panel of the size required by the non-bearing wall.

Hereinafter, with reference to the accompanying drawings of Figure 1 will be described an embodiment of the present invention;

The fireproof urethane panel according to the present invention is implemented to impart fire resistance by improving flame retardancy. In the present invention, a foamable inorganic compound is mixed with isocyanate and polyol, which is a raw material of urethane foam, and KS F 2271-1998, which is a Korean standard. It is structured to meet the standard of KS F 2257 (fire resistance test method of building structure part) which is the standard and test method of flame retardancy of interior materials and structure of building.

That is, the urethane panel 1 in this Example has a structure which consists of 35-44 weight% of said isocyanates which are main materials, 35-44 weight% of polyols which are hardening | curing agents, and 12-30 weight% of foamable inorganic compounds.

Here, the expandable inorganic compound (2) is made of expandable graphite, and if the expandable graphite is less than 12wt% in the above ratio, the fire resistance is greatly reduced, and if it is 30wt% or more, the viscosity of the polyol and isocyanate rises rapidly and the panel It does not mold.

The expandable graphite is prepared using crystalline graphite flakes, which are buried in various parts of the world, and are usually contained in the sedimentary soil or mud contained in the metamorphic rock or by weathering. The crystalline graphite is obtained by crushing the light and then sorting it through a floating acid method, and the quality at this time is 90 to 98% of the carbon content. The graphite is in the form of a plate crystal in which carbon atoms are stacked, and each of these layers is attached with a very weak bonding force. This arrangement causes chemicals to permeate between the carbons to produce expandable graphite. In more detail the manufacturing process of the expandable graphite, the sulfuric acid is impregnated between the graphite layer, it is prepared by washing and drying. That is, crystalline graphite is a lattice-like lattice layer in which carbon atoms are arranged in parallel. Since there is no covalent bond between the lattice layers, other molecules can intervene in the form of sandwiches between the layers. Thus, the form of "layers between different lattice" is a factor for making expandable graphite, and commercially, sulfuric acid is permeated into the graphite structure, and the flakes are washed and dried. Thus, the layers between the different lattice layers are filled with carbon lattice, resulting in a dry and fluidity having a minimum acid value. The expandable graphite prepared as described above has a long and curved shape.

When the "layer structure between different lattice" is exposed to heat, molecules (sulfuric acid) that seep between the layers decompose and generate SO ₂ gas. In this case, the graphite layer is separated by the generated gas and eventually expands. Expanded graphite is low specific gravity, noncombustible and thermally insulating, reflecting up to 50% of the emitted heat.

As shown in FIG. 1, the panel having the above structure is formed of a foam panel 1 in which a plurality of pores 2 are formed, and the porous inorganic compound 3 is formed between the pores 2 and the pores 2 ′. Since it is in the state containing expandable graphite which is), it will have the outstanding characteristic in strength and fire resistance performance.

In particular, although the ignition temperature of the urethane foam is about 310 ° C., the expandable graphite expands in volume between 150 to 200 ° C. to form a carbonized layer before the urethane foam is ignited to impart fire resistance in case of a fire. It will function to block.

Referring to the manufacturing method of the refractory urethane panel is as follows.

First, the liquid polyol and isocyanate and the expandable graphite are respectively filled in a feed tank separately provided and maintained at a predetermined processing temperature, followed by stirring to have a uniform temperature distribution and a uniform phase through a low speed stirrer. At this time, the processing temperature is usually maintained at 18 ℃ to 24 ℃.

Each of the stock solutions is circulated through the circulation pump and transported to the foamer through a pipe or a hose to be mixed at a predetermined ratio. At this time, 35 to 44 wt% of the isocyanate, 35 to 44 wt% of the polyol, and 12 to 30 wt% of the expandable graphite are introduced into the foaming machine and mixed.

Before the reactants mixed and reacted in the foaming machine start addition reactions and dispersion polymerization is completed, the liquid reactants are filled in a mold of a plate or slab form so as to naturally solidify within 10 minutes.

The urethane foam solidified in the mold is finished by cutting into a panel having a size required by the non-bearing wall.

The present invention described above is not limited to the above-described embodiments and drawings, and various permutations, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those who have

As described above, the present invention provides a urethane foam, which is a foam having a plurality of pores, to expand the carbonized layer before the urethane foam is ignited in the event of a fire while satisfying the strength required by the non-bearing wall by adding expandable graphite that is expanded in a predetermined temperature. By maximizing the fire resistance, it has the effect of minimizing the damage to life by blocking toxic gases.

Claims (5)

A refractory urethane panel composed of 35 to 44 wt% of isocyanate as a main material, 35 to 44 wt% of polyol as a curing agent, and 12 to 30 wt% of an expandable inorganic compound. The method of claim 1, A refractory urethane panel in which the expandable inorganic compound is made of expandable graphite. A first step of filling polyol, isocyanate, and expandable graphite in a feed tank and maintaining the same at a predetermined temperature; A second step of mixing the isocyanate by 35 to 44 wt%, polyol 35 to 44 wt%, and expandable graphite at 12 to 30 wt% by mixing with a foaming machine; A third step of filling in a mold of a predetermined shape and solidifying for a predetermined time before dispersion polymerization of the reactants mixed and reacted in the foaming machine is completed; 4th step to cut into panels of size required for nonbearing walls Method for producing a refractory urethane panel comprising a. The method of claim 1, The first step is a method for producing a refractory urethane panel comprising the step of maintaining at 18 ℃ to 24 ℃. The method of claim 1, The third step is a method of producing a refractory urethane panel comprising the step of cooling by cooling in the air for 10 minutes.