KR20180111135A - Process for preparing sandwich panel with non-conbustibility - Google Patents

Abstract

The present invention relates to a method for manufacturing a flame-retardant sandwich panel and, more specifically, to a method for economically manufacturing a flame-retardant sandwich panel having excellent physical properties by using a continuous method after molding a flame-retardant insulating composition and an adhesive. According to the present invention, the sandwich panel has excellent physical features such as flame retardants, strength, and durability. Moreover, the sandwich panel is manufactured by using a continuous method that molds the sandwich panel in a molding machine by using the adhesive and the flame-retardant insulating composition. Therefore, the sandwich panel can be manufactured economically in a short period of time.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a flame retardant sandwich panel,

The present invention relates to a method for manufacturing a flame retardant sandwich panel, and more particularly, to a method for economically manufacturing a flame retardant sandwich panel having excellent physical properties by molding a flame retardant insulation composition and an adhesive after continuous molding.

Plywoods, glass fiber boards, expanded polystyrene panels, foamed urethane panels, and the like are widely used for building insulation, insulation, and building wall.

Among these, a foamed urethane sandwich panel (hereinafter referred to as "urethane panel") is superior in terms of heat insulation effect as compared with other heat insulation materials, and is excellent in properties such as light weight, buffering property and self adhesive property. In addition, the urethane panel has a great advantage in terms of easiness of production and processability of a product having a complicated model since the base material is a liquid rather than a solid.

Urethane panels are widely used in factory buildings, refrigeration storage facilities, refrigerated agricultural and livestock warehouses, and refrigerated trucks due to their soundproofing, waterproofing and moisture proofing as well as excellent insulation performance. In addition, since the urethane panel is installed in a prefabricated manner, the installation can be carried out easily and quickly, and there is no problem such as dust generation at the time of operation, thereby providing a pleasant working environment.

Such a urethane panel is largely manufactured by a single-panel manufacturing method and a roll-forming method.

In the roll forming method, when a foaming process is performed by continuously injecting (spraying) a predetermined amount of a urethane raw material mixture liquid between an upper panel member and a lower panel member which are continuously transported in a roll form at intervals, they are heated and pressed by a double slit conveyor belt It is a continuous production system that hardens. The long panel produced continuously is cut according to the standard.

In the roll forming method, a charging device for rapidly and evenly dispersing the mixed liquid on the upper surface of the lower panel member becomes a key factor. Since the mixed solution rapidly proceeds to polymerize and becomes highly viscous in a short time, the slot type dispenser (FIG. 2A) proposed by the registered utility model No. 20-0365277 can not be practically applied. It may be possible because it contains polystyrene granules.) It is possible to use the method of the present invention, for example, in Patent No. 10-0407865 (see FIG. 2B, not for mixed liquid injection) or No. 10-939000 (see FIG. 2C, A plurality of air outlets are formed perpendicularly to the advancing direction of the lower panel member, that is, along the width direction of the lower panel member, and the mixed liquid is ejected from the air outlets to the upper surface of the lower panel member.

However, according to this conventional technique, the dispersion of the mixed liquid is less on the side of the panel, and the height of the mixed liquid on the line passing through the jet port is high and the height of the mixed liquid between the lines is low. If the curvature is not flattened until the upper steel sheet is covered for some reason, the density of the mixed liquid at that portion is low, so that the gas generated from the surroundings during the foaming process is collected at the low pressure portion.

Known prior art for flame retarded expanded polystyrene is a method in which a mixed aqueous solution of sodium silicate used as a flame retardant is applied to expanded polystyrene and molded, left to stand for 4 to 6 days to dry naturally, or radiant heat, steam, In case of the former, there is a problem that the production time is long, the work is troublesome and the load space is occupied a lot. In the latter case, the additional equipment or process is required for drying, so that the flame retardant Time and a large cost are consumed.

In addition, the flame retardant thus fused can exhibit flame retardancy to a certain extent, but the bonding strength between the expanded polystyrene is rather low, thereby failing to maintain its shape continuously in a predetermined standard during molding and being broken, There is a problem, and there is a limit that can not be put to practical use.

Registration No. 10-1411675 (June 18, 2014) Registration No. 10-0922175 (2009.10.09)

The inventors of the present invention have made intensive studies to fabricate a sandwich panel having excellent physical properties such as flame retardancy, strength and durability. As a result, it has been found that a sandwich panel manufactured by a continuous process of molding in a molding machine using an adhesive composition and flame- Can be economically produced within a short time as well as being excellent in physical properties, and has completed the present invention.

Accordingly, an object of the present invention is to produce a sandwich panel having excellent physical properties such as flame retardancy, strength and durability in one aspect.

An object of the present invention is, in a further aspect,

A method of manufacturing a sandwich panel,

A forming step of an upper plate and a lower plate for performing a rolling process by roll-forming a steel plate uncoiled in an uncoiler by a roll forming machine through a roll forming machine and a banding and punching device;

Molding a heat insulating material by injecting a flame-retardant heat insulating material mixed with an adhesive into a molding machine positioned between the upper plate and the lower plate to be transferred;

Placing the molded heat insulating material between an upper plate and a lower plate to be conveyed, and pressing the panel on which the flame-retardant heat insulating material is adhered with a pressure roller; And

Cutting the formed sandwich panel to a predetermined length,

Wherein the adhesive is a liquid type and the urethane resin base and the curing agent are mixed at a weight ratio of 1: 0.3 to 0.7, and the adhesive and the flame-retardant insulating material are mixed at a weight ratio of 1: 5 to 15 .

The sandwich panel according to the present invention is not only excellent in physical properties such as flame retardancy, strength and durability but also can be produced economically in a short time because it is manufactured by a continuous process in which a molding is performed in a molding machine using an adhesive and a flame retardant insulating composition.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a structural view showing a facility used in a method for manufacturing a flame retardant sandwich panel according to the present invention; FIG.
2 is a process diagram showing a method for manufacturing a flame-retardant sandwich panel according to the present invention.

In one aspect of the present invention, in a method of manufacturing a sandwich panel,

A forming step of an upper plate and a lower plate for performing a rolling process by roll-forming a steel plate uncoiled in an uncoiler by a roll forming machine through a roll forming machine and a banding and punching device;

Molding a heat insulating material by injecting a flame-retardant heat insulating material mixed with an adhesive into a molding machine positioned between the upper plate and the lower plate to be transferred;

Placing the molded heat insulating material between an upper plate and a lower plate to be conveyed, and pressing the panel on which the flame-retardant heat insulating material is adhered with a pressure roller; And

Cutting the formed sandwich panel to a predetermined length,

Wherein the adhesive is a liquid type and the urethane resin base and the curing agent are mixed at a weight ratio of 1: 0.3 to 0.7, and the adhesive and the flame-retardant insulating material are mixed at a weight ratio of 1: 5 to 15 do.

Hereinafter, a method of manufacturing a flame-retardant sandwich panel according to the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention disclosed in the present specification and drawings are merely illustrative examples of the present invention and are not intended to limit the scope of the present invention in order to facilitate understanding of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

FIG. 1 is a structural view showing a facility used in a method for manufacturing a flame retardant sandwich panel according to the present invention, and FIG. 2 is a process diagram showing a method for manufacturing a flame retardant sandwich panel according to the present invention.

As shown in FIGS. 1 and 2, the method for manufacturing a sandwich panel according to the present invention includes a step of forming upper and lower plates, a step of injecting an adhesive and a flame-retardant heat insulating material composition, a pressing step and a cutting step.

First, in the upper and lower plate forming steps, a steel plate uncoiled in an uncoiler is roll-formed through a roll-forming machine, and the banding process is performed while passing through a banding and punching device. Galvanized steel sheet can be mainly used for steel sheet.

More specifically, first, in order to manufacture the upper plate 10 and the lower plate 20, the uncoiled steel sheet is unfolded flatly while passing through the leveler in the uncoiler 110 in a state in which the steel plate is wound. Such a leveler is provided with a plurality of pressure rollers on the upper and lower sides, and functions to spread flatly on the side of the introduced steel sheet.

The steel sheet spreading through the leveler passes through a roll forming machine 120. The roll forming machine 120 is a known forming forming machine composed of a plurality of roll combinations. Particularly, And a pair of upper and lower rolls so as to be suitably used.

In this case, the roll forming machine 120 may be constituted by a roll forming machine for manufacturing an upper plate and a roll forming machine for manufacturing a lower plate, which can be reversed along the guide rails.

Then, a bending process is performed while passing through a banding and punching device. In this case, the banding and punching device may include a notching machine, a conveying rail, a T-bending machine, an R-bending machine, a punching machine, and the like.

Next, the step of injecting the flame-retardant insulating material is a step of injecting a flame-retardant insulating material mixed with an adhesive between the upper plate and the lower plate to be transferred. The adhesive agent and the flame-retardant insulating material are first mixed and sprayed with an adhesive composition in a stirrer, It may be preferable to mix the adhesive and the flame-retardant insulating material.

(A) 35 to 50% by weight of a urethane resin, 5 to 10% by weight of a polyethylene glycol diglycidyl ether, 0.5 to 2% by weight of an abalone shell powder having an average particle diameter of 100 mesh or less, A urethane resin base comprising 1 to 5% by weight of calcium, 0.1 to 1% by weight of phenol, 0.05 to 1% by weight of polyoxyethylene monooleate and 40 to 50% by weight of water; (B) 35 to 50% by weight of polyamide, 10 to 20% by weight of polyoxypropylene diamine, 3 to 5% by weight of triethylene tetramine, 3 to 10% by weight of polyoxyethylene monooleate, 5 to 10% And 20 to 40% by weight of water, can be preferably used.

Further, it is more preferable that the mixture of the base and the curing agent in a weight ratio of 1: 0.3 to 0.7 is more preferable.

In the present invention, the urethane resin may be a urethane resin commonly used in this technical field. The polyethylene glycol diglycidyl ether may be a reactive diluent, the abalone shell powder may be a flocculant, the calcium carbonate may be a filler, polyoxyethylene monooleate An emulsifier, and phenol serve as accelerators, respectively. The abalone shell powder preferably has an average particle diameter of 100 mesh or less in view of providing an efficient flame retardancy.

Particularly, 45 wt% of urethane resin, 6 wt% of polyethylene glycol diglycidyl ether, 1.1 wt% of abalone shell powder, 2.5 wt% of calcium carbonate, 0.3 wt% of phenol, 0.1 wt% of polyoxyethylene monoole, % Urethane resin threads; And 45% by weight of polyamide (weight average molecular weight 2800), 16% by weight of polyoxypropylene diamine, 5% by weight of triethylenetetramine, 5% by weight of polyoxyethylene monooleate, 5% by weight of phenol and 24% And a curing accelerator which is included in the curing accelerator and the mixture of the curing agent and the curing agent in a weight ratio of 1: 0.5 is preferably used.

Wherein the flame-retardant heat insulating material composition comprises EPS particles in an amount of 65.0 to 75.0 wt%, talc in an amount of 3.0 to 10.0 wt%, calcium carbonate in an amount of 3.0 to 10.0 wt%, anilite powder in an amount of 3.0 to 5.0 wt%, pearlite powder in an amount of 3.0 to 5.0 wt% By weight and zeolite-based silicate hydrate of 3.0 to 5.0% by weight.

As the raw material of the EPS particles, particles obtained by foaming a conventional styrene resin may be used in the form of beads. In addition, if desired, polyurethane, PUR, PIR, glass wool, and mineral wool may be used.

If the EPS particles are contained in an amount of less than 65.0% by weight based on the total weight of the flame-retardant heat insulating material composition, a problem of insufficient synergistic effect of heat insulation due to the heat insulating material composition occurs. If the EPS particles are more than 75.0% by weight, There arises a problem that the composition ratio of the other composition becomes insufficient. Therefore, it is preferable that the composition is contained at a composition ratio within the range of 65.0 to 75.0% by weight.

The size of the particles is not particularly limited, and a conventional one or a commercially available one may be used. Since the technique of forming the particles belongs to the technical content commonly used in the art, detailed description thereof will be omitted.

The talc, calcium carbonate, ilite and perlite powders are components used as a filler to impart flame retardancy, and can provide desirable physical strength and flame retardancy within the set range.

The talc is a silicate mineral, belonging to a monoclinic system, and has a colorless, glossy, white or green gray color. Such talc is resistant to heat and is used in electrical insulation, paints, lubricants, ceramics, paper, refractories, heat insulation materials, etc. In the present invention, fired talc in powder form is used as a flame retardant.

The calcium carbonate is a major component of limestone, marble, calcite, beryl, chalk, gypsum, shell, egg shell and coral. It is a white substance in which carbonate ion and calcium ion are formed and formed, and it is not soluble in water and precipitates in an aqueous solution.

The illite is a fine mica-type mineral belonging to monoclinic, having a hardness of 1 to 2 and a specific gravity of 2.6 to 2.9. In addition, since 2 (-) is charged, it has a function of adsorbing and decomposing various heavy metals, and has a bacteriostatic action such as viruses, bacteria, fungi, and adsorption and deodorization of toxic gases and odors in the air.

Perlite is a perlite, which is a glassy rock formed by rapid cooling of lava generated by volcanic activity and contains 2.5% of crystallized water. When rapidly heated to a temperature of 871 ° C or higher, the crystallized water is vaporized and expanded into light porous particles It becomes an expanded perlite, and usually the perlite leads to an expanded perlite.

The zeolite-based silicate hydrate may provide better flame retardancy by using a zeolite-based silicate hydrate in which a functional group such as a hydroxyl group exposed to the surface is replaced with a metal. That is, when the functional group such as the hydroxyl group of the zeolite silicate hydrate is replaced by Cu, Co, Fe, Ni or Zn, the effect of reducing the pore size of the zeolitic silicate hydrate and the flame retardancy of the above- So that the effect of further improving the flame retardancy of the flame-retarding composition liquid can be obtained.

The zeolite-based silicate hydrate may be at least one of faujasite (FAU), chabazite (CHA) or ferrierite (FER) structure types.

As the spore-forming zeolite, any one of substituted or unsubstituted zeolites X, Y and SAPO-37 can be used. As the zeolite having a chabazite structure, substituted or unsubstituted AlPO-34, CoAPO-44, CoAPO-47 SAPO-34 and SAPO-47 can be used. As the ferrierite type zeolite, any of ZSM-35 and NU-23 which is substituted or unsubstituted can be used.

The filler components may be of various particle sizes depending on the use of the flame-retarding composition liquid, but it is preferable to use those having an average particle diameter of 10 to 400 탆.

Subsequently, the adhesive composition and the flame-retardant heat insulating material composition are homogeneously mixed in an agitating barrel 30, and then these raw materials are injected into a molding die 40 and molded.

Normally, the mold 40 of the heat insulating material is formed with a molding groove of a general heat insulating material, and a plate-shaped molding groove of a hexagonal shape is formed.

In addition, it is preferable that the molding frame is configured to be capable of emitting heat of 60 to 70 ° C so that the heat insulating material injected into the molding groove can be molded as heat energy. In molding the heat insulating material, It is preferable that the heat insulating material injected into the molding groove by the molding machine is pressurized to a certain pressure and the pressurized state is maintained for 2 to 3 minutes.

At this time, if a predetermined amount of the flame-retardant heat insulating material composition is foamed by passing through the mold 40, the panel is cured in the process of heating and pressurizing by the double slit conveyor belt to form a sandwich panel continuously.

Then, in the pressing step, the panel to which the flame-retardant insulating material is adhered is pressed with a pressure roller.

Finally, in the cutting step, the formed sandwich panel is cut to a certain length. The continuously manufactured sandwich panel 100 is cut to a required length using a cutter in the cutting process, and the cut panel is loaded or transported.

< Example >

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are only intended to further illustrate the present invention and that the scope of the present invention is not limited by these embodiments in accordance with the gist of the present invention.

Example  1: Manufacture of flame retardant sandwich panels

35 g of a urethane resin (POYDO KPU-600, Kuko Chemical) as an adhesive, 10 Kg of polyethylene glycol diglycidyl ether, 2 Kg of abalone shell powder having an average particle diameter of 100 mesh or less, 4 Kg of calcium carbonate, 1 Kg of phenol, 1 kg of ethylene monooleate and 47 kg of water, and 40 Kg of polyamide (G-0930EC70, Kukdo Chemical), 15 Kg of polyoxypropylene diamine, 4 Kg of triethylene tetramine, polyoxyethylene monooleate 5 kg of phenol, 7 kg of phenol, and 29 kg of water were mixed in a weight ratio of 2: 1, and 1,050 Kg of EPS particles (the same resin) having an average particle diameter of 1 mm and a talc powder 35 Kg of CaCO ₃ , 35 Kg of perlite powder (particle diameter 80 mesh), 35 Kg of magnesium oxide (particle diameter 200 mesh), and 35 kg of Co-zeolite Y (particle size: 80 mesh) Particle diameter 200 mesh) After the stirrer was uniformly stirred and added to the mixer comprising the addition, the mixture is charged into the molding machine to thereby prepare a sandwich panel in a continuous manner.

Test Example  1: Adhesion test

A test specimen (test specimen KSF 4918) was prepared using the adhesive composition used in Example 1, and the adhesive strength was tested. As a result, the adhesive strength was 35.0 kgf / cm 2, and a strong adhesion was confirmed.

Test Example  2: Nonflammability test and hazard test

Using the heat insulation composition used in Example 1, the specimen was made into a specimen having a diameter of 45 mm and a height of 50 mm, followed by heating for 20 minutes. The results are shown in Table 1 below.

Test Items result Criteria Test Methods Flammability test 15.1 30% or less KS F 2271 and KS F ISO 1182 and KS F ISO 5660-1 Gas hazard test 15:20 9:00 or more EN ISO 1182

As can be seen from the test results shown in Table 1, the flame retardant compositions prepared according to the present invention were found to satisfy all of the requirements of flame retardancy and hazards.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible. Accordingly, the spirit of the present invention should be understood only in accordance with the following claims, and all equivalents or equivalent variations thereof are included in the scope of the present invention.

100: Sandwich panel 110: Uncoiler section
120: roll forming machine
10: top plate 20: bottom plate
30: stirrer 40: molding machine

Claims (4)

A method of manufacturing a sandwich panel,
A forming step of an upper plate and a lower plate for performing a rolling process by roll-forming a steel plate uncoiled in an uncoiler by a roll forming machine through a roll forming machine and a banding and punching device;
Molding a heat insulating material by injecting a flame-retardant heat insulating material mixed with an adhesive into a molding machine positioned between the upper plate and the lower plate to be transferred;
Placing the molded heat insulating material between an upper plate and a lower plate to be conveyed, and pressing the panel on which the flame-retardant heat insulating material is adhered with a pressure roller; And
Cutting the formed sandwich panel to a predetermined length,
Wherein the adhesive is a liquid type and the urethane resin base and the curing agent are mixed at a weight ratio of 1: 0.3 to 0.7, and the adhesive and the flame-retardant insulation are mixed at a weight ratio of 1: 5 to 15. The method according to claim 1,
Wherein the adhesive and the flame-retardant insulating material are mixed by a step of injecting an adhesive agent into the stirrer and a step of mixing an adhesive and a heat insulating material by adding a flame-retardant insulating material composition, and then the mixture is put into a molding machine and molded. The method according to claim 1,
The adhesive
(a) 35 to 50% by weight of urethane resin, 5 to 10% by weight of polyethylene glycol diglycidyl ether, 0.5 to 2% by weight of abalone shell powder having an average particle diameter of not more than 100 mesh, 1 to 5% by weight of calcium carbonate, To about 1% by weight, from 0.05 to 1% by weight of polyoxyethylene monooleate, and from 40 to 50% by weight of water; And
(b) 35 to 50% by weight of polyamide, 10 to 20% by weight of polyoxypropylene diamine, 3 to 5% by weight of triethylene tetramine, 3 to 10% by weight of polyoxyethylene monooleate, 5 to 10% And a curing accelerator comprising 20 to 40% by weight of water, wherein the curing accelerator is a two-component adhesive in which the curing agent and the curing agent are mixed in a weight ratio of 1: 0.3 to 0.7. The method according to claim 1,
Wherein the flame-retardant heat insulating material composition comprises EPS particles in an amount of 65.0 to 75.0 wt%, talc in an amount of 3.0 to 10.0 wt%, calcium carbonate in an amount of 3.0 to 10.0 wt%, anilite powder in an amount of 3.0 to 5.0 wt%, pearlite powder in an amount of 3.0 to 5.0 wt% By weight of zeolite based silicate hydrate and 3.0 to 5.0% by weight of zeolite based silicate hydrate.

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