KR102615736B1 - Heat reflective insulation panel and manufacturing method thereof - Google Patents

Abstract

The present invention includes the steps of a) preparing a flame retardant composition containing a polyethylene resin, a functional flame retardant, and an organic-inorganic composite flame retardant; b) adding a foaming agent to the flame retardant composition and then mixing to form a mixture; c) extruding the mixture and then foaming to form a foam; d) forming and processing the foam to produce a workpiece; It relates to a method of manufacturing a heat reflective insulation panel, characterized in that it is manufactured including the step of adhering the outer covering material to one or both sides of the workpiece.

Description

Heat reflective insulation panel and manufacturing method thereof}

The present invention relates to a heat reflective insulation panel that has characteristics such as low smoke and non-toxicity during the combustion process, is easy to process, and has excellent flame retardancy and heat resistance, and a method of manufacturing the same.

The content described below simply provides background information related to the present invention and does not constitute prior art.

Recently, large-scale fire accidents have resulted in many casualties and property damage. In the case of this fire accident, the exterior walls of the building were constructed using the so-called 'Drybit method', which involves constructing the exterior wall of the building with insulation, adhesive mortar, and finishing materials without flame retardant or non-combustible properties. This is believed to be the cause of the rapid spread of the fire, resulting in greater damage.

Accordingly, the government revised the 'Rules on standards for building evacuation/fire protection structures, etc.' to significantly strengthen fire safety standards for building finishing materials, and has been in effect since April 2016.

Representative examples of insulation materials used in conventional insulation construction mainly include styrofoam, expanded polyurethane, and expanded polyethylene. In the case of expanded polyethylene, in order to enhance flame retardancy, flame retardants classified into halogen-based, inorganic-based, and phosphorus-based were added to prevent combustion by flame or flame.

However, in the case of the above halogen-based flame retardants, although it is easy to secure flame retardancy, they have poor compatibility with polyethylene resin, generate carbides due to decomposition due to retention in the extruder, and produce harmful toxic substances such as hydrobromic acid, dioxin, and benzofuran during processing and combustion. There were problems such as the generation of gas. As such, there is a problem that halogen-based flame retardants are harmful to the human body and have a negative effect on product properties, manufacturing processes, and stability.

In addition, in the case of inorganic flame retardants, in order to exhibit sufficient flame retardant effect, an excessive amount of inorganic flame retardants must be used, and thus molding processability is not easy, so there is a problem that they cannot be easily manufactured into insulation materials.

Meanwhile, in the case of phosphorus-based flame retardants, they have been in the spotlight because they have the advantage of having a shorter toxicity duration than the above-mentioned halogen-based flame retardants, generating less smoke during the combustion process, and being environmentally friendly when used, but there is a risk of deteriorating the basic physical properties of the resin. During use of the product, it can easily leak into the environment through volatilization, abrasion, leaching, precipitation, penetration, and dissolution. If the leaked phosphorus-based flame retardant accumulates inside the human body, it can cause toxicity, damage to reproductive function, endocrine disorders, and carcinogenesis. There were problems that could cause various adverse health effects.

Accordingly, there is an urgent need to develop an insulation panel that can solve the above problems while maximizing heat resistance, flame retardancy, and eco-friendliness.

(Prior Document 1) Korean Patent Publication No. 10-1843630 (Prior Document 2) Korean Patent Publication No. 2019-0022089

The present invention provides a heat-reflecting insulation panel that not only has heat resistance, but also blocks and isolates oxygen, which is a direct cause of flame spread, and has a cooling effect by absorbing surrounding heat, while simultaneously improving eco-friendliness, flame retardancy, and heat resistance. The purpose is to

The heat reflective insulation panel of the present invention includes the steps of a) preparing a flame retardant composition containing a polyethylene resin, a functional flame retardant, and an organic-inorganic composite flame retardant; b) adding a foaming agent to the flame retardant composition and then mixing to form a mixture; c) extruding the mixture and then foaming to form a foam; d) forming and processing the foam to produce a workpiece; e) adhering the outer covering material to one or both sides of the workpiece;

The flame retardant composition is characterized by comprising 45 to 70% by weight of polyethylene resin, 15 to 40% by weight of a functional flame retardant, and 1 to 25% by weight of an organic-inorganic composite flame retardant.

The functional flame retardant is characterized in that it contains 30 to 45% by weight of expanded graphite, 25 to 40% by weight of talc, and 20 to 35% by weight of zinc borate.

The organic-inorganic composite flame retardant is characterized in that it is manufactured by reacting an organic phosphorus compound and an inorganic flame retardant.

The organophosphorus compound is characterized in that it is prepared by reacting DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) of the formula 1 below and a silane compound of the formula 2 below.

[Formula 1]

[Formula 2]

(here, is a vinyl group of C ₂ to C ₆ , is a C ₁ to C ₈ linear, branched or alicyclic alkyl group.)

The inorganic flame retardant is characterized in that it is at least one selected from aluminum hydroxide (Al(OH)3), magnesium hydroxide, and (Mg(OH)2).

Between step d) and step e), the method further includes applying a functional coating solution to one or both sides of the workpiece.

In addition, the present invention can provide a heat reflective insulation panel, which is manufactured by any of the manufacturing methods described above.

The present invention has the effect of providing a heat-reflecting insulation panel that can comprehensively improve eco-friendliness, flame retardancy, and heat resistance by manufacturing an insulation material using a flame-retardant composition containing an organic-inorganic composite flame retardant.

Figure 1 is a process diagram showing a method of manufacturing a heat reflective insulation panel of the present invention.

Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all transformations, equivalents, and substitutes included in the spirit and technical scope of the present invention. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

Additionally, singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as 'comprise' or 'have' are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that it does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Additionally, terms such as first and second may be used to separately describe various components, but the components should not be limited by the terms. Please note that the above terms are used only for the purpose of distinguishing one component from another component.

The method for manufacturing a heat reflective insulation panel of the present invention includes the steps of a) preparing a flame retardant composition containing a polyethylene resin, a functional flame retardant, and an organic-inorganic composite flame retardant; b) adding a foaming agent to the flame retardant composition and then mixing to form a mixture; c) extruding the mixture and then foaming to form a foam; d) forming and processing the foam to produce a workpiece; e) adhering the outer covering material to one or both sides of the workpiece;

First, a) preparing a flame retardant composition containing a polyethylene resin, a functional flame retardant, and an organic-inorganic composite flame retardant; wherein the flame retardant composition contains 45 to 70% by weight of polyethylene resin, 15 to 40% by weight of a functional flame retardant, and an organic-inorganic composite. It is characterized in that it contains 1 to 25% by weight of a flame retardant.

The polyethylene resin (PE; PolyEthylene Resin) is a synthetic resin made from ethylene and has remarkable heat insulating properties.

The functional flame retardant is characterized in that it includes expanded graphite, talc, and zinc borate.

The functional flame retardant is a component used to assist the flame retardancy of the final manufactured insulation panel and improve water resistance, and can be used in an appropriate amount, taking into account the level required when necessary. Most preferably, the functional flame retardant may be used containing 30 to 45% by weight of expanded graphite, 25 to 40% by weight of talc, and 20 to 35% by weight of zinc borate.

The expanded graphite used in the functional flame retardant has a layered crystal structure. Expandable graphite with this structure is expanded 20 to 350 times by the flame, water, and oxidizing compounds formed by combustion, forming a porous structure, preventing heat from moving. In addition, it plays a role in trapping toxic gases in the porous structure, resulting in excellent flame retardant effects.

The expanded graphite may be one commonly used by those skilled in the art, but in order to improve the uniformity of mixing with other components included in the functional flame retardant and to prevent deterioration of physical properties, the average particle size is 400 to 600 mesh. It is desirable to use .

In the case of talc, it is a white powder with a plate-shaped particle shape manufactured by finely or ultrafinely grinding talc ore. It has the lowest hardness among inorganic mineral products and has excellent heat resistance and chemical stability, so it can be used as a flame retardant. In addition, it has excellent water resistance and can be easily used as a functional flame retardant.

In the case of the zinc borate, it has excellent heat resistance, electrical properties, and water resistance, and exhibits an endothermic phenomenon as a dehydration reaction occurs at high temperature, and can exhibit an excellent flame retardant effect due to an endothermic amount of 530 J/g.

Meanwhile, in the case of the functional flame retardant, in order to further strengthen the flame retardancy, it may further include 1 to 3% by weight of an eco-friendly, almost non-toxic phosphorus-based flame retardant, and the phosphorus-based flame retardant is tricresyl phosphate (TCP). , bisphenol A bis (diphenyl phosshate), triethyl phosphate (TEP, Triethyl Phosphate), Resorcinol bis diphenyl phosphate (RDP), and pentaerythritol phosphate (Pentaerythritol phosphate). Most preferably, it may be tricresyl phosphate (TCP).

Hereinafter, the organic-inorganic composite flame retardant of step a) will be described in detail.

The organic-inorganic composite flame retardant is characterized in that it is manufactured by reacting an organic phosphorus compound and an inorganic flame retardant.

First, in the case of an inorganic flame retardant, the inorganic flame retardant may be one or more selected from aluminum hydroxide (Al(OH) ₃ ), magnesium hydroxide, and (Mg(OH) ₂ ).

In the case of the magnesium hydroxide (Mg(OH) ₂ ), when heat is generated in the surroundings, the hydroxyl group (-OH), which is a reactive group of magnesium hydroxide, absorbs the heat and generates water, thereby producing a flame retardant effect. Mechanical rigidity can be improved. In addition, it has the advantage of being environmentally friendly because it does not emit toxic gases even when exposed to high temperatures.

In the case of aluminum hydroxide (Al(OH) ₃ ), it easily reacts and dissolves in alkali and remains stable up to 200°C, and absorbs a large amount of heat due to the process of dehydration of crystal water at a higher temperature, thereby providing a cooling effect. It can absorb harmful substances such as dioxin and hydrogen chloride gas generated during combustion. In other words, heat resistance, acid resistance, and flame retardancy can be expected at the same time, and the generation of smoke and toxic gases can be reduced in the event of a fire.

Depending on the method, the inorganic flame retardant forms any one of calcium, antimony, tin, germanium, titanium, iron, zirconium, cesium, bismuth, strontium, manganese, lithium, sodium, and potassium into a metal hydroxide to form the magnesium hydroxide or the hydroxide. It can be configured to replace aluminum.

Meanwhile, the organophosphorus compound is characterized in that it is prepared by reacting DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) of the formula 1 below and a silane compound of the formula 2 below.

More specifically, DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) of Chemical Formula 1 and the silane compound of Chemical Formula 2 below are dissolved in benzoyl peroxide, dimetalaniline, and toluene using benzene as a solvent. It is synthesized by adding one or more items in a dropwise manner. Benzoyl peroxide is a radical initiator of carboxyl group and was used as a catalyst for polymerization reaction. At this time, dimethylaniline was used as a substance used as a precursor for organic compounds.

[Formula 1]

[Formula 2]

(here, is a vinyl group of C ₂ to C ₆ , is a C ₁ to C ₈ linear, branched or alicyclic alkyl group.)

In the case of DOPO of Formula 1, not only does it exhibit good flame retardant performance, but it is also one of the safest flame retardants in terms of sustainability. In particular, DOPO was found to have little cytotoxicity against HepG2 cells at the same concentration and other conditions as other flame retardants (Toxicol. Res., 2018, 7, 492)

In addition, even when reacted with a second flame retardant, it has the characteristic of not deteriorating flame retardancy even after combining or reacting with the second flame retardant due to its high solubility.

In the case of the silane compound of Formula 2, direct heat permeability due to high temperature can be reduced by reducing the cell gap per unit area of the insulation material, thereby providing excellent flame retardant performance and heat resistance performance to the insulation material. In addition, the silane compound has a binding effect, so it can improve the solubility and mixing reactivity of the flame retardant composition.

Accordingly, in the case of an organophosphorus compound produced by reacting DOPO and a silane compound, it can act as a flame retardant by absorbing activated salts, releasing free gas, and producing a flame suppression effect, and contains halogenated substances. Since it is not used, it has an environmentally friendly effect.

For example, the silane compound represented by Formula 2 may include a compound represented by Formula 3 below, and a compound represented by Formula 3 below and DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene) of Formula 1. When reacting -10-oxide), a compound represented by the following formula 4 can be obtained. The compound represented by formula 4 and the inorganic flame retardant (aluminum hydroxide Al(OH) ₃ ) or magnesium hydroxide (Mg(OH) ₂ ) Through the reaction, it is finally possible to obtain an organic-inorganic composite flame retardant represented by Chemical Formula 5 to Chemical Formula 6.

[Formula 3]

(Here, the compound of Formula 3 is obtained by reacting acrylic acid and triethoxysilane, and is obtained by adding sulfuric acid to triethoxysilane and performing a dehydration condensation reaction.)

[Formula 4]

(Here, the compound of Formula 4 is obtained by reacting the compound of Formula 1 with the compound of Formula 3, and is obtained by dissolving DOPO in a benzene solvent and adding benzoyl peroxide, dimethylaniline, and toluene in a dropwise manner. .)

[Formula 5]

(Here, the compound of Formula 5 is obtained by reacting the compound of Formula 4 and aluminum hydroxide Al(OH) ₃ ), and the compound of Formula 4 and aluminum hydroxide are first refluxed in a mixed solution containing ethyl alcohol and demineralized water. After synthesis, the first synthesized composite was filtered through a vacuum filter and the filtered cake was washed several times with demineralized water.)

[Formula 6]

(Here, the compound of Formula 5 is obtained by reacting the compound of Formula 4 with magnesium hydroxide Mg(OH) ₂ ). After first synthesizing the compound of Formula 4 and magnesium hydroxide through reflux in a mixed solution containing ethyl alcohol and demineralized water, the first synthesized composite is filtered using a vacuum filter, and the filtered cake is washed with demineralized water several times. , obtained.)

The organic-inorganic composite flame retardant, which is manufactured by reacting an organophosphorus compound and an inorganic flame retardant, absorbs surrounding heat in the event of a fire or flame, and is decomposed into the organophosphorus compound and the inorganic flame retardant, so it has the effect of shrinking and reducing heat transfer. . That is, the organic-inorganic composite flame retardant can cause a cooling effect or cooling effect in the process of decomposition through an endothermic reaction.

In addition, after the organic-inorganic composite flame retardant is decomposed into the organic phosphorus compound and the inorganic flame retardant, the organic phosphorus compound and the inorganic flame retardant cause oxygen capture and suffocation effects, respectively, which has the effect of secondaryly blocking the spread of flame.

In addition, since the organic-inorganic composite flame retardant is a cross-linked form of a highly soluble organic phosphorus compound and an inorganic compound, it has remarkable flame retardancy and is easily combined with other components included in the flame retardant composition than when the inorganic flame retardant is used alone. When mixed, it has the effect of performing the role of a binder.

In the case of the organic-inorganic composite flame retardant, if it is contained in excess of 25% by weight, there is a problem in that the physical properties change and processability may be reduced, and if it is contained in less than 1% by weight, the flame retardancy is greatly reduced, resulting in a flame retardant composition for insulation materials. It is not suitable for use as a

b) adding a foaming agent to the flame retardant composition and then mixing to form a mixture; examples of the foaming agent include water, ammonium carbonate, and azodicarbonamide. In the case of the above foaming agent, when foaming the flame retardant composition, it minimizes the outflow of gas and allows them to crosslink and fuse with each other, thereby showing stable foaming power.

At this time, the amount of foaming agent added may vary depending on the necessary physical properties of the mixture, but if the foaming agent is added and mixed in an amount of less than 1 part by weight relative to 100 parts by weight of the flame retardant wire composition, there is a risk that the foaming power of the mixture may decrease. , When mixed in excess of 35 parts by weight, the mixture foams excessively, causing problems such as lower strength and lower physical properties, which is undesirable. Therefore, the foaming agent should be added in an amount of 1 to 35 parts by weight based on 100 parts by weight of the flame retardant composition. You can.

c) extruding the mixture and then foaming to form a foam; in which, after the mixture is extruded, it is crosslinked and foamed in a foaming furnace under temperature conditions of 120°C to 200°C to form a chemically crosslinked foam. It is desirable to allow it to be manufactured.

More preferably, between step b) and step c), a step of adding a stabilizer to the mixture and then mixing may be further included. At this time, the stabilizer is intended to ensure that the flame retardant composition maintains its physical and chemical properties stably even after being mixed with the foaming agent, thus assisting the heat release effect as well as the flame retardant synergistic effect, and reducing smoke generated from the flame. Silicone oil having a viscosity of 4,000 to 10,000 cs may be used as the stabilizer. The amount of the stabilizer added may vary depending on the required physical properties of the mixture, but it is preferable to add 1 to 5 parts by weight of the stabilizer per 100 parts by weight of the flame retardant composition.

d) forming and processing the foam to produce a workpiece; in the step, the foam can be placed in a mold and molded and processed into a desired shape or shape.

e) adhering a shell material to one or both sides of the workpiece; in the step, a commonly used aluminum sheet can be used as a shell material and heat-bonded to one side or both sides of the workpiece, more preferably, An aluminum sheet containing glass fiber cloth can be heat bonded to further improve heat permeability at high temperatures. The thickness of the outer covering material can be easily determined by a person skilled in the art, and is most preferably 0.3 mm to 10 mm.

Depending on the method, between step d) and step e), a step of applying a functional coating liquid to one or both sides of the workpiece may be further included.

At this time, the functional coating liquid may include liquid sodium silicates and liquid potassium silicate.

In the case of the liquid sodium silicates and liquid potassium silicate, since they have adhesive strength, they can allow the workpiece and the outer covering material to be more firmly bonded, and can further improve flame retardancy by swelling in the event of a fire. Therefore, it is suitable as a coating liquid applied to one or both sides of the workpiece.

At this time, in the case of sodium silicates, the strength may decrease due to moisture, so to prevent this, the functional coating liquid may further include aluminum sulfate.

Additionally, in order to further improve the binding force of the functional coating liquid, hemp extract may be further included. In the case of the hemp extract, it corresponds to a mucous substance that can be obtained after putting hemp in water and heating it for a certain period of time. In addition, since it is a natural material, it does not cause toxic gases in case of fire, and can induce a strong bond between the processed product and the outer covering material.

The present invention can provide a heat reflective insulation panel, which is manufactured by the above-mentioned manufacturing method.

Hereinafter, a heat reflective insulation panel according to a preferred embodiment of the present invention will be described in more detail. However, the scope of the present invention is not limited by the following examples.

■ Example: Manufacturing of heat reflective insulation panel

<Example 1>

a) A flame retardant composition containing 65% by weight of polyethylene resin, 20% by weight of a functional flame retardant, and 15% by weight of an organic-inorganic composite flame retardant was prepared.

At this time, the functional flame retardant was used consisting of 35% by weight of expanded graphite of 500 mesh, 35% by weight of talc, and 30% by weight of zinc borate, and the organic-inorganic composite flame retardant was used as a compound represented by the following formula (5).

[Formula 5]

b) Afterwards, 25 parts by weight of azodicarbonamide was added to 100 parts by weight of the flame retardant composition to form a mixture.

c) Next, the mixture was put into an extruder, extruded, and foamed at a pressure of 100 to 140 bar to form a foam.

d) After molding the foam in a mold, it was dried at a temperature of 45°C for 24 hours, and a processed product was manufactured by cutting it into a standardized insulating material.

e) A heat reflective insulation panel was manufactured by adhering aluminum sheets to a thickness of 1 mm on both sides of the workpiece.

<Example 2>

In the manufacturing method of Example 1, the functional flame retardant in step a) is composed of 32% by weight of expanded graphite of 500 mesh, 35% by weight of talc, 30% by weight of zinc borate, and 3% by weight of tricresyl phosphate (TCP, Tricresyl Phosphate). It was prepared in the same manner as Example 1, except that the composition was used.

<Example 3>

In the manufacturing method of Example 1, between step b) and step c), silicone oil having a viscosity of 4,000 to 10,000 cs is further added to the mixture and mixed, wherein the silicone oil is added to 100 weight of the flame retardant composition. It was prepared in the same manner as Example 1, except that 3 parts by weight were added.

<Example 4>

In the manufacturing method of Example 1, between step d) and step e), a functional coating solution is applied to one or both sides of the workpiece, wherein the coating solution contains 40% by weight of liquid sodium silicate and 40% by weight of liquid potassium silicate. %, aluminum sulfate 15% by weight. It was prepared in the same manner as Example 1, except that 5% by weight of hemp extract was used.

<Example 5>

In the manufacturing method of Example 1, the functional flame retardant in step a) is composed of 32% by weight of expanded graphite of 500 mesh, 35% by weight of talc, 30% by weight of zinc borate, and 3% by weight of tricresyl phosphate (TCP, Tricresyl Phosphate). In that the composition was used, between step b) and step c), silicone oil having a viscosity of 4,000 to 10,000 cs was further added to the mixture and mixed, wherein the silicone oil was added to 100 parts by weight of the flame retardant composition. Regarding the fact that 3 parts by weight were added, between step d) and step e), a functional coating solution was applied to one or both sides of the workpiece, wherein the coating solution contained 40% by weight of liquid sodium silicate and 40% by weight of liquid potassium silicate. , 15% by weight of aluminum sulfate. It was prepared in the same manner as Example 1, except that 5% by weight of hemp extract was used.

<Comparative Example 1>

a) A flame retardant composition containing 80% by weight of polyethylene resin and 20% of a functional flame retardant was prepared. (The flame retardant composition does not contain an organic-inorganic composite flame retardant.)

At this time, the functional flame retardant was used consisting of 35% by weight of 500 mesh expanded graphite, 35% by weight of talc, and 30% by weight of zinc borate.

b) Afterwards, 25 parts by weight of azodicarbonamide was added to 100 parts by weight of the flame retardant composition to form a mixture.

c) Next, the mixture was put into an extruder, extruded, and foamed at a pressure of 100 to 140 bar to form a foam.

d) After molding the foam in a mold, it was dried at a temperature of 45°C for 24 hours, and a processed product was manufactured by cutting it into a standardized insulating material.

e) A thermal material panel was manufactured by adhering aluminum sheets to a thickness of 1 mm on both sides of the workpiece.

<Comparative Example 2>

An insulating panel was manufactured by using polyethylene resin as an insulating material and attaching aluminum sheets to a thickness of 1 mm on both sides of the polyethylene resin.

■ Test example: heat release test and gas toxicity test

1) Experiment method

The heat release test for each of Examples 1 to 5 and Comparative Examples 1 to 2 was measured according to KS F ISO 5660-1, and gas toxicity was measured according to KS F 2771. Table 1 shows the test specifications, and Table 2 shows the test specimens used in the gas toxicity test.

division Test specifications Test Methods Flame retardant level 2
(Semi-non-smoking material) heat release test
KS F ISO 5660-1 The total heat release rate for 10 minutes after the start of the heating test is 8MJ/㎡ or less, and the maximum heat release rate for 10 minutes is continuous for more than 10 seconds.
It should not exceed 200kW/㎡, and after heating for 10 minutes, there should be no cracks, holes, or melting harmful to fire protection penetrating the test specimen (in the case of composite materials, this includes the core material completely melting or disappearing). gas hazard test
KS F 2271 The average behavioral suspension time of laboratory rats is more than 9 minutes. Flame retardant level 3
(flame retardant) heat release test
KS F ISO 5660-1 The total heat release rate for 5 minutes after the start of the heating test is 8MJ/㎡ or less, and the maximum heat release rate for 5 minutes does not exceed 200kW/㎡ for more than 10 consecutive seconds. After heating for 5 minutes, there are no cracks, holes, or cracks harmful to fire prevention that penetrate the test specimen. There must be no melting (including the complete melting or disappearance of the core material in the case of composite materials). gas hazard test
KS F 2271 The average behavioral suspension time of laboratory rats is more than 9 minutes.

mouse pedigree mouse gender Average mouse weight (g) ICR female 19

2) Experiment results

Table 3 below shows the average values of three experiments of Examples 1 to 5 and Comparative Examples 1 to 2.

Test Items Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative example 2 heat emission
test Total heat released
(MJ/㎡)2 2.1 1.6 1.7 1.6 1.3 7.5 11 Heat release rate continuously 200 kW/㎡
Time to exceed (seconds) 0 0 0 0 0 8.5 15 Harmful fire hazard penetrating the test object
Cracks, holes and melting etc. doesn't exist doesn't exist doesn't exist doesn't exist doesn't exist has exist has exist gas
Harmful
test Action stoppage time
(minute:second) 15:21 17:38 17:11 18:12 19:12 8:12 5:11

As shown in Table 3, it can be confirmed that Examples 1 to 5 have excellent flame retardancy and low gas toxicity.

Claims (8)

a) preparing a flame retardant composition containing polyethylene resin, a functional flame retardant, and an organic-inorganic composite flame retardant;
b) adding a foaming agent to the flame retardant composition and then mixing to form a mixture;
c) extruding the mixture and then foaming to form a foam;
d) forming and processing the foam to produce a workpiece;
e) heat-adhering an aluminum sheet or an aluminum sheet containing glass fiber cloth to one or both sides of the workpiece;
The flame retardant composition includes 45 to 70% by weight of polyethylene resin, 15 to 40% by weight of a functional flame retardant, and 1 to 25% by weight of an organic-inorganic composite flame retardant,
The organic-inorganic composite flame retardant is manufactured by reacting an organic phosphorus compound with an inorganic flame retardant,
The organophosphorus compound is,
Silane obtained by adding sulfuric acid to the formula 3 prepared by reacting DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) of the formula 1 below with acrylic acid and triethoxysilane and performing a dehydration condensation reaction It is characterized in that it is prepared by adding any one or more of benzoyl peroxide, dimetalaniline, and toluene to the compound using benzene as a solvent in a dropwise manner,
[Formula 1]

[Formula 3]

The inorganic flame retardant is characterized in that it is at least one selected from aluminum hydroxide (Al(OH)3), magnesium hydroxide, and (Mg(OH)2),
The organic-inorganic composite flame retardant,
After first synthesizing the organophosphorus compound and the inorganic flame retardant through reflux in a mixed solution containing ethyl alcohol and deionized water, the first synthesized compound is filtered using a vacuum filter, and the filtered cake is washed several times with demineralized water. A method of manufacturing a heat reflective insulation panel, characterized in that obtained through delete According to clause 1,
A method of manufacturing a heat reflective insulation panel, wherein the functional flame retardant includes 30 to 45% by weight of expanded graphite, 25 to 40% by weight of talc, and 20 to 35% by weight of zinc borate. delete delete delete According to clause 1,
Between step d) and step e), applying a functional coating liquid to one or both sides of the workpiece. A method of manufacturing a heat reflective insulation panel, characterized in that it further comprises the step of applying a functional coating liquid to one or both sides of the workpiece. A heat reflective insulation panel manufactured by the manufacturing method according to any one of claims 1, 3, and 7.