KR20150063990A - Thermosetting foaming body with superior adiabatic and flameproof effect and method for manufacturing the same - Google Patents

Abstract

The present invention provides a thermosetting foam comprising: a polyisocyanurate foam formed by polymerizing a polyol-based compound and an isocyanate-based compound; a nucleating agent; and a flame retardant. The polyisocyanurate foam includes an isocyanurate group, formed by trimerizing isocyanate-based compounds. An average diameter of foamed cells is 50-200 μm. The nucleating agent includes tetramethylsilane. The flame retardant includes cresyl diphenyl phosphate or isopropyl phenyl diphenyl phosphate. The thermal decomposition initiation temperature of the thermosetting foam measured by thermogravimetric analysis is 310 °C or higher.

Description

TECHNICAL FIELD [0001] The present invention relates to a thermosetting foam having improved heat insulation and flame retardancy, and a method of manufacturing the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a thermosetting foam,

More particularly, the present invention relates to a thermosetting foam improved in heat insulation and flame retardancy, and a method for producing the same.

Thermosetting foams can be used mainly for various buildings, warehouses, and heat insulating materials for refrigerators. At this time, the insulation material is used to increase or decrease the efficiency of heating and cooling by blocking or reducing the heat exchange between inside and outside of the building. It can be widely used in various fields such as building boards and panels, insulation materials for LNG ships, The thermosetting foam used as an insulating material can be a foamed cell structure filled with a foaming gas to improve the heat insulating performance.

The above-mentioned thermosetting foams have been widely used because they have excellent heat insulation performance, processability, and less physical properties due to temperature variation compared with other synthetic resins. However, recently, as related regulations on the flame retardancy of heat insulating materials have been strengthened, Have been investigated.

Korean Patent No. 10-0610392 discloses a method for producing a thermoplastic resin-based flame retardant foam comprising kneading a thermoplastic resin and a flame retardant, and thereafter continuously causing dissolution of a fluidized foaming agent in the thermoplastic resin to grow a foamed cell The physical properties and heat insulating performance of the thermosetting foam can be reduced as compared with the case where the flame retardancy is increased by adding the flame retardant.

In one embodiment of the present invention, a thermosetting foam having a small and uniform foamed cell is provided by simultaneously using a polyisocyanurate foam and introducing a nucleating agent and a flame retardant.

In another embodiment of the present invention, there is provided a process for producing a thermosetting foam having improved heat insulation and flame retardancy.

One embodiment of the present invention provides a thermosetting foam comprising a polyisocyanurate foam formed by polymerization of a polyol compound and an isocyanate compound, a nucleating agent and a flame retardant, and having a pyrolysis initiation temperature of about 310 ° C or higher by thermogravimetric analysis do.

The flame retardant may be in liquid or powder form.

The flame retardant may be at least one selected from the group consisting of a phosphorus-based flame retardant, a metal hydride-based flame retardant, a halogen-based flame retardant, a flame retardant auxiliary, and a mixture thereof.

The phosphorus flame retardant may be at least one selected from the group consisting of triphenyl phosphate, cresyl diphenyl phosphate, isopropyl phenyl diphenyl phosphate, and mixtures thereof.

The halogen-based flame retardant may be decabromodiphenyl oxide or octiphenylmodiphenyl oxide.

The flame retarding auxiliary may be antimony trioxide.

The nucleating agent may include a silane-based compound or a siloxane-based compound.

The average diameter of the foamed cells formed in the polyisocyanurate foam may be about 50 탆 to about 200 탆.

The content of the flame retardant may be about 1 part by weight to about 20 parts by weight based on 100 parts by weight of the polyol compound.

The content of the nucleating agent may be about 1 part by weight to about 10 parts by weight based on 100 parts by weight of the polyol compound.

The thermosetting foam may further comprise a polymerization catalyst, a surfactant, and a foaming agent.

The thermosetting foam may have a thermal conductivity of about 0.025 W / mk or less.

The thermosetting foam may have a closed cell ratio of 80% or more.

The thermosetting foam may have a density of 10 kg / m ³ to 150 kg / m ³ .

Another embodiment of the present invention is a method for producing a polyurethane foam, comprising: mixing a polyol compound and a nucleating agent; Adding a flame retardant to the mixture of the polyol compound and the nucleating agent; And polymerizing the polyisocyanurate by stirring the isocyanate compound to a mixture obtained by further adding the flame retardant, wherein the pyrolysis initiation temperature by thermogravimetric analysis is about 310 ° C or higher.

The thermosetting foam, which is an embodiment of the present invention, has low thermal conductivity, improved mechanical properties such as compressive strength and flexural strength, and has excellent flame retardancy.

In addition, by using the method of producing a thermosetting foam according to another embodiment of the present invention, it is possible to obtain a small and uniform foam cell through addition of a nucleating agent while using an environmentally friendly foaming agent which does not affect ozone layer destruction.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.

Thermosetting Foam

In one embodiment of the present invention, a thermosetting foam comprising a polyisocyanurate foam, a nucleating agent and a flame retardant, which are formed by polymerization of a polyol compound and an isocyanate compound, and having a pyrolysis initiation temperature of about 310 ° C or higher by thermogravimetric analysis, to provide.

Generally, when a flame retardant is added to improve the flame retardancy of a thermoplastic foam, the surface tension of the polyisocyanurate foam or the like may increase during the reaction with the polyisocyanurate foam or the like. However, one embodiment of the present invention can compensate for the negative effects caused by the addition of the flame retardant agent by controlling the surface tension through a nucleating agent having an average particle size.

The thermosetting foam may include a flame retardant to provide a pyrolysis initiation temperature of about 310 ° C or more by thermogravimetric analysis. As described above, the thermosetting foam contains a nucleating agent together with a flame retardant, so that a negative effect generated by the flame retardant does not occur, and a thermosetting foam having excellent heat resistance and flame retardancy can be provided by including a flame retardant.

The thermogravimetric analysis refers to an analysis for measuring a change in weight in a material during heating, and is usually measured to determine the stability of the material against heat. Generally, starting at room temperature, measuring up to about 600 ° C, measuring at a rate of about 10 ° C per minute, a section where the mass decreases rapidly by more than 5% during measurement, which is called the pyrolysis start temperature or mass decrease temperature. By including the flame retardant, the pyrolysis initiation temperature of the thermosetting foam by the thermogravimetric analysis method is measured to be about 310 ° C or more, and the pyrolysis starting temperature can be higher than that of the conventional thermosetting foam by simultaneously containing the nucleating agent and the flame retardant.

The polyisocyanurate foam contained in the thermosetting foam may be formed by polymerizing a polyol compound and an isocyanate compound. The polyisocyanurate foam is a material containing an iocyanurate group in which three isocyanate groups are bonded in a ring structure to a polyurethane foam conventionally used widely as a heat insulating material. The polyisocyanurate foam exhibits excellent performance in terms of thermal stability and mechanical strength due to such a ring structure. In the prior art, the effect of improving the heat insulation performance is obtained by reducing the size of the foamed cell by introducing a substance such as clay or aerosol into the polyol during the production of the polyurethane foam.

However, when the additive is introduced into the polyol, problems such as dispersibility and storage stability may occur. Therefore, in one embodiment of the present invention, a nucleating agent is introduced to form a foamed cell of a polyisocyanurate foam densely and uniformly . The smaller the size of the foamed cells formed in the insulation, the higher the insulation effect and the higher the mechanical strength. Therefore, by adding a substance capable of contributing to the initial nucleation in addition to the foaming agent, the size of the foamed cells can be reduced, The physical properties of the heat insulating material can be improved.

The polyol compound is a material containing a plurality of hydroxy groups in one molecule, and reacts with an isocyanate compound to form a urethane bond and to proceed the polymerization. The polyol compound may be a polyester polyol or a polyether polyol. The polyester polyol is an anhydrous phthalic acid

the polyether polyol may be one prepared by reacting phthalic anhydride or adipic acid with ethylene oxide, propylene oxide or a mixture thereof, and the polyether polyol may be an ethylene glycol 1, 2-propane glycol, butylene glycol, 1,6-hexanediol, 1,8-oxanediol, , Neopentyl glycol, 2-methyl-1,3-propanediol, glycol, trimethylolpropane, 1,2,3-hexane 1,2,3-hexanetriol, 1,2,4-butanetriol, trimethylolmethane, pentaerythritol, diethyleneglycol (diethyleneglycol) ), Triethylene glycol, polyethyleneglycol, tripropylene glycol, polypropylene glycol (polypropylene glycol) such as glycerol, glycerin, glycerin, glycerin, glycerin, glycerin, glycerin, glycerin, glycerin, glycerin, glycerin, glycerin, glycerin, glycerin, glycerin, glycerin, glycerin, And at least one selected from the group consisting of bisphenol may be produced by reacting ethylene oxide, propylene oxide or a mixture thereof.

The isocyanate compound is a substance containing an isocyanate group in the molecule. The isocyanate group reacts with the hydroxyl group of the polyol compound to form a urethane bond, and three isocyanate groups are reacted to be trimerized to form isocyanurate . A diisocyanate compound having an NCO index as high as about 250 can be used because it is generally advantageous to use a substance having a larger number of isocyanate groups than the isocyanate compound used for polymerization of polyurethane for the formation of isocyanurate.

In one embodiment of the present invention, polymeric methylene diphenyl diisocyanate (polymeric MDI), monomeric methylene diphenyl diisocyanate (MDI), polymeric toluene diisocyanate , polymeric TDI) and monomeric toluene diisocyanate (monomeric TDI) can be used as the isocyanate compound.

The flame retardant included in the thermosetting foam may be in liquid form or in powder form. When the flame retardant is in a liquid form, it has an excellent dispersibility and has an advantageous effect in that it does not aggregate with a polyisocyanurate foam or a nucleating agent or a mixture thereof.

When the flame retardant is used in powder form, the flame retardant maintains an average particle diameter of about 1 μm to about 100 μm, thereby ensuring the dispersibility of the flame retardant. The poly It is possible to prevent breakage of the foamed cells formed on the isocyanurate foam.

The flame retardant may be at least one selected from the group consisting of a phosphorus-based flame retardant, a metal hydride-based flame retardant, a halogen-based flame retardant, a flame retardant auxiliary, and a mixture thereof. The flame retardant is an additive added to improve the plasticity resistance of the plastic, and has the function of interfering with the combustion. As a result, the flame retardancy can be increased to broaden the application as a thermosetting foam.

Specifically, the phosphorus flame retardant includes at least one selected from the group consisting of triphenyl phosphate, cresyl diphenyl phosphate, isopropyl phenyl diphenyl phosphate, and mixtures thereof. The halogen-based flame retardant may include decabromodiphenyl oxide or octabromophenyl oxide, and the flame retarding auxiliary may include antimony trioxide.

The nucleating agent may include a silane-based compound or a siloxane-based compound. By including the nucleating agent, the thermal conductivity inevitably rising due to the addition of the flame retardant can be suppressed to some extent and the surface tension can be controlled.

The type of the nucleating agent is not particularly limited, and a silane nucleating agent, a siloxane nucleating agent, a perfluoralkane nucleating agent, or the like can be used. Specifically, silane compounds and siloxane compounds having low surface tension and excellent compatibility with methylene diphenyl diisocyanate or polyol may be used, and one or more of these compounds may be used in combination. As the silane compound, compounds such as hexamethyldisilazane and dimethoxydimethylsilane can be used, and as the siloxane compound, hexamethyldisiloxane can be used.

The average diameter of the foamed cells formed in the polyisocyanurate foam may be about 50 占 퐉 to about 200 占 퐉. The average diameter refers to the average diameter or the representative diameter of the formed foam cells. When the average diameter of the foam cells is less than about 50 탆, there is a fear that the thermal conductivity increases rather than the contribution due to conduction in the thermal conductivity. Mu] m, the size of the foamed cell formed becomes too large, so that the foamed cell can not be uniformly formed. Therefore, there is an advantage in that uniform and small foam cells can be produced by maintaining the content of the foam cells within the above range.

The content of the flame retardant may be about 1 part by weight to about 20 parts by weight based on 100 parts by weight of the polyol compound. When the flame retardant is contained in an amount of less than about 1 part by weight, flame retardancy may be poor, and when it is more than about 20 parts by weight, workability may be poor. Therefore, there is an advantage in that both the effect of maintaining the processability and improving the flame retardancy can be achieved by maintaining the content of the flame retarder within the above range.

The content of the nucleating agent may be about 1 part by weight to about 20 parts by weight based on 100 parts by weight of the polyol compound. If the amount of the nucleating agent is less than about 1 part by weight, the effect of the nucleating agent may be insignificant due to the nucleating agent added in a small amount. If the amount of the nucleating agent is more than about 10 parts by weight, non-uniform foaming cells may be formed due to the plasticizing effect. Therefore, it is advantageous in that the content of the nucleating agent is maintained within the above range, so that a small and uniform foam cell can be produced even though the flame retardant is added.

The thermosetting foam may further comprise a polymerization catalyst, a surfactant, and a foaming agent. Specifically, the polymerization catalyst promotes the trimerization of the isocyanates, and improves the reaction rate to help form isocyanurate groups. The polymerization catalyst may be selected from the group consisting of acetic acid, octanoic acid, 2,4,6-tris [(dimethylamino) methyl] phenol, Tris-3-dimethylamine-propyl hexahydrotrizine, and potassium hexanoate. The term " tris-3-dimethylamine-propyl hexahydrotriazine "

The foaming agent acts to form a foam cell inside the heat insulating material by generating gas during the polymerization process. Since the foaming agent exists in the cell after polyisocyanurate foam is formed, it is advantageous to use a material having low thermal conductivity and high stability. The blowing agent may be selected from the group consisting of cyclopentene, chlorofluorocarbon, isopentane, n-pentane, hydrochlorofluorocarbon, hydrofluorocarbon and water. At least one selected from the group consisting of cyclopentane, water, or a mixture thereof, which is a blowing agent that does not contain chlorine, is advantageous in environmental aspects.

The surface active agent controls the surface tension at the time of forming the foam cell to suppress the size of the foam cell from becoming excessively large, and stabilizes the formation of the foam cell. As the kind of the surfactant, it is possible to use various kinds known in the art.

The thermosetting foam may have a thermal conductivity of about 0.025 W / mk or less. Thermal conductivity refers to the physical properties that indicate the size of the thermal conduction, and it can be deduced that the lower the thermal conductivity, the better the insulation performance. By including the polyisocyanurate foam, the nucleating agent and the flame retardant together, the thermosetting foam exhibits not only flame retardancy but also excellent heat insulation property, so that a low thermal conductivity can be ensured and the thermal conductivity can be maintained at about 0.025 W / mk or less It is possible to increase the utilization of buildings, household appliances, and automobiles.

The thermosetting foam may have a closed cell ratio of about 80% or greater. The thermosetting foam is made of a small honeycomb-shaped cell, and the percentage of the closed cells among the cells is referred to as a closed cell ratio. The higher the closed cell ratio is, the better the heat insulating property is. When the closed cell ratio is less than about 80%, a certain level of heat insulating property may not be secured. Although there is no limitation on the upper limit of the closed cell ratio, when the closed cell ratio is excessively high, the air permeability of the thermosetting foam tends to deteriorate, the elasticity may lower and the durability may be deteriorated.

The thermoset foam may have a density of from about 10 kg / m ³ to about 150 kg / m ³ , specifically from about 20 kg / m ³ to about 100 kg / m ³ . By keeping the density of the thermosetting foam within the above range, it is possible to provide a relatively light thermosetting foam.

Thermosetting Foam  Manufacturing method

In another embodiment of the present invention, there is provided a process for producing a polyurethane foam, comprising: mixing a polyol compound and a nucleating agent; Adding a flame retardant to the mixture of the polyol compound and the nucleating agent; And polymerizing the polyisocyanurate by stirring the isocyanate compound to a mixture obtained by further adding the flame retardant, wherein the pyrolysis initiation temperature by the thermogravimetric analysis method is 310 ° C or higher. The pyrolysis initiation temperature can be about 310 ° C or higher, as described above.

In the step of mixing the polyol compound and the nucleating agent, the mixing speed of the polyol compound and the nucleating agent may be about 500 rpm to about 5,000 rpm. In order to uniformly disperse the polyol compound and the nucleating agent, the mixture is mixed at a low speed of about 500 rpm for about 30 seconds to about 60 seconds at an initial stage of mixing, and then the mixing speed is increased to increase the mixing speed to about 5,000 rpm . On the other hand, when the polyol compound is mixed at an excessively low speed at the time of initial mixing, the viscosity of the polyol compound is high and the viscosity of the nucleating agent is low.

The step of mixing the polyol compound and the nucleating agent can also be carried out at a temperature of about 0 캜 to about 30 캜. If the progress temperature is less than about 0 ° C, the polyol compound and the nucleating agent will not sufficiently disperse. On the other hand, if the progress temperature exceeds about 30 ° C, the nucleating agent may be evaporated because the nucleation point of the nucleating agent is low.

The stirring speed of adding the flame retardant to the mixture of the polyol compound and the nucleating agent may be from about 500 rpm to about 5,000 rpm. This is a rate set so that the flame retardant can be uniformly mixed. When the temperature is outside this range, the respective materials may be unevenly distributed to deteriorate the physical properties of the polyisocyanurate foam.

Further, the step of adding the flame retardant to the mixture of the polyol compound and the nucleating agent is about 0? To about 40 < [deg.] ≫ C. Exceeding this temperature range can change the characteristics of the flame retardant. Specifically, when a flame retardant is added after adding a surfactant, the flame retardant can be more effectively mixed into a mixture of the polyol compound and the nucleating agent having a lower surface tension.

The stirring speed of the step of polymerizing the polyisocyanurate by stirring the isocyanate compound to the mixture obtained by adding the flame retardant may be about 3,000 rpm to about 5,000 rpm. This is a rate set so that the reaction between the polyol compound and the isocyanate compound and the trimerization reaction between the isocyanates can be performed in a sufficiently fast time. When stirring at a rate lower than about 3,000 rpm, there is a problem that the reaction between the polyol compound and the isocyanate compound is not smooth enough so that the reaction between the polyol compound and the isocyanate compound is smooth. On the other hand, when the stirring speed is higher than about 5,000 rpm, The reaction may be incomplete.

Further, the step of polymerizing the polyisocyanurate by stirring the isocyanate compound to the mixture obtained by adding the above flame retardant is about 0? To about 20 < [deg.] ≫ C. If the temperature is lower than 0 ° C, the condensation reaction between the polyol compound and the isocyanate compound and the trimerization reaction between the isocyanate groups do not occur. On the other hand, if the temperature is higher than 20 ° C, There arises a problem that the stabilization is disturbed or the reactant is volatilized.

Hereinafter, specific embodiments of the present invention will be described. However, the embodiments described below are only intended to illustrate or explain the present invention, and thus the present invention should not be limited thereto.

≪ Examples and Comparative Examples &

Example  One

3.0 g of tetramethyl silane (TMS) as a nucleating agent and 1.0 g of isopropyl phenyl diphenyl phosphate (IPPP) as a flame retardant were added to 100 g of a polyol having a weight of 100 g. As the polyol, a mixture of a polyether polyol and a polyester polyol in a weight ratio of 4: 6 was used. Since the viscosity of the used polyol is relatively higher than that of tetramethylsilane, which is a nucleating agent, in order to allow tetramethylsilane to be inserted well between the polyol compounds, a mechanical stirrer is used, (First stage stirring), and then stirred at 1,000 rpm, 2,000 rpm, 3,000 rpm, 4,000 rpm, and 5,000 rpm for 30 seconds, respectively, to prepare a mixed solution.

1.0 g of isopropylphenyl diphenyl phosphate (IPPP), which is a flame retardant, was stirred at 20 DEG C at 3000 rpm for 10 seconds to prepare a polyisocyanurate foam. Further, for the reaction of the polyol compound and the diisocyanate, a thermosetting foam was prepared in a mold after stirring for 20 seconds at 5,000 rpm using a mechanical stirrer.

Example  2

A thermosetting foam was prepared in the same manner as in Example 1 except that the amount of isopropyl phenyl diphenyl phosphate (IPPP), which is a flame retardant, was increased to 3.0 g.

Example  3

A thermosetting foam was prepared in the same manner as in Example 1 except that the addition amount of isopropylphenyl diphenyl phosphate (IPPP), which is a flame retardant, was increased to 5.0 g.

Example  4

Cresyl Diphenyl Phosphate (CDP) was used instead of isopropyl phenyl diphenyl phosphate (IPPP) as a flame retardant and the amount of addition was 1.0 g, To prepare a cured foam.

Example  5

A thermosetting foam was prepared in the same manner as in Example 4 except that the addition amount of cresyl diphenyl phosphate (CDP) as a flame retardant was increased to 3.0 g.

Example  6

A thermosetting foam was prepared in the same manner as in Example 4 except that the amount of cresyl diphenyl phosphate (CDP), which is a flame retardant, was increased to 5.0 g.

Comparative Example  One

And dried in a vacuum oven for 24 hours to remove water contained in the organic clay (30B clay, Southern Clay Co.) containing hydroxyl groups. Next, 160 g of polymeric 4,4-diphenyldetane diisocyanate (M50, BASF Corp.) and 3.0 g of the above 30B clay were added to 100 g of the polyol used in Example 1, and the reaction was carried out in an oil bath Lt; / RTI > The M50 and 30B clay were mixed homogeneously and agitated at a speed of 3,000 rpm for 2 hours using a mechanical stirrer to prepare a mixed solution so that a smooth reaction could proceed.

A catalyst and a surfactant were added to the mixed solution and reacted at room temperature to prepare a clay-polyisocyanurate nanocomposite. The polymeric 4,4-diphenylmethane diisocyanate containing the organic clay was stirred for 10 seconds at 5,000 rpm using a mechanical stirrer to prepare a thermosetting foam in the mold

Comparative Example  2

A thermosetting foam was prepared in the same manner as in Example 1, except that 5.0 g of isopropyl phenyl diphenyl phosphate (IPPP) was added as a flame retardant without adding a nucleating agent such as tetramethylsilane.

Comparative Example  3

A thermosetting foam was prepared in the same manner as in Example 1 except that no nucleating agent such as tetramethylsilane and a flame retardant such as isopropyl phenyl diphenyl phosphate (IPPP) were added.

Nucleating agent Flame retardant Flame retardant form Example 1 3.0 g of tetramethylsilane 1.0 g of isopropylphenyldiphenylphosphate Liquid phase Example 2 3.0 g of tetramethylsilane 3.0 g of isopropylphenyldiphenylphosphate Liquid phase Example 3 3.0 g of tetramethylsilane 5.0 g of isopropylphenyldiphenylphosphate Liquid phase Example 4 3.0 g of tetramethylsilane 1.0 g of cresyl diphenyl phosphate Liquid phase Example 5 3.0 g of tetramethylsilane 3.0 g of cresyl diphenyl phosphate Liquid phase Example 6 3.0 g of tetramethylsilane 5.0 g of cresyl diphenyl phosphate Liquid phase Comparative Example 1 Organic clay 3.0 g - - Comparative Example 2 - 5.0 g of isopropylphenyldiphenylphosphate Liquid phase Comparative Example 3 - - -

< Experimental Example > - Thermosetting Foam  Physical Characteristics

The thermal conductivity, compressive strength, flexural strength and pyrolysis initiation temperature of the above Examples and Comparative Examples were measured. First, in order to compare the heat insulating performance of the thermosetting foam prepared according to the above Examples and Comparative Examples, the thermal conductivity And then the compressive strength was measured according to ASTM D 1621.

In addition, the flexural strength was measured according to ASTM D790, and the pyrolysis starting temperature at the time when the weight change of the thermosetting foam occurred by thermogravimetric analysis was measured.

Thermal conductivity
(W / mK) Compressive strength
(kg / cm ² ) Flexural strength
(kg / cm ² ) Pyrolysis starting temperature
(° C) Foam cell
Average particle diameter (占 퐉) Example 1 0.021 1.56 7.23 315 172 Example 2 0.022 1.47 6.98 321 165 Example 3 0.022 1.39 6.81 329 148 Example 4 0.021 1.59 7.10 316 170 Example 5 0.022 1.53 6.92 327 150 Example 6 0.023 1.41 6.87 341 130 Comparative Example 1 0.026 0.98 3.62 302 320 Comparative Example 2 0.029 1.04 4.87 309 280 Comparative Example 3 0.027 1.28 5.45 300 250

From the above experimental examples, it can be confirmed that the thermosetting foams according to Examples 1 to 6 have lower thermal conductivity than the thermosetting foams according to Comparative Examples 1 to 3. This indicates that when the thermosetting foam is used as an insulating material, the insulation properties of the insulating material are improved when the silane-based compound is used as the nucleating agent, which is the most important physical property related to the heat insulating performance. In the case of Comparative Example 1, although the organic clay was mixed with the nucleating agent, the storage stability and the like were deteriorated, and as a result, the adiabatic performance was also disadvantageous.

Compressive strength and flexural strength were measured as a result of comparison with the comparative example. Compressive strength and flexural strength are functions attributable to the thermosetting foam, and all of the examples show sufficient physical properties to be used as a heat insulating material Respectively.

In addition, in Examples 1 to 6, flame retardant was included together with a nucleating agent, showing excellent heat-insulating performance as well as flame retardant performance, and pyrolysis started at a temperature of about 310 ° C or higher. In Comparative Example 1, But pyrolysis started at a temperature of less than about 310 ° C. In the case of Comparative Example 2, although the flame retardant was included, the thermal decomposition starting temperature was relatively high because it did not contain the nucleating agent, but the thermal conductivity was measured to be 0.029 W / mK and the insulation performance was deteriorated. In the case of Comparative Example 3, it was found that both the heat insulating performance and the flame retardant performance were significantly deteriorated because neither the nucleating agent nor the flame retardant were included.

Further, in contrast to the average particle diameter of the foamed cells formed on the polyisocyanurate foam was measured to be about 50 탆 to about 200 탆 for the examples, the average particle diameter of the foamed cells of the comparative example was measured to be about 200 탆 or more It was confirmed that it is difficult to form a uniform and small-sized foam cell when the flame retardant and the nucleating agent are not contained at the same time.

As a result, the thermosetting foam, which is an embodiment of the present invention, comprises a flame retardant in the polyisocyanurate foam to ensure flame retardancy and, at the same time, contain a nucleating agent to control the surface tension of the thermosetting foam to form a polyisocyanurate foam It is possible to maintain a certain size of the formed foam cell and secure the thermal conductivity.

Claims (8)

A polyisocyanurate foam formed by polymerization of a polyol compound and an isocyanate compound, a nucleating agent and a flame retardant,
The polyisocyanurate foam comprises an isocyanurate group of a ring structure formed by trimerization of isocyanate compounds, the average diameter of the foamed cells formed therefrom is 50 to 200 탆,
Wherein the nucleating agent comprises tetramethylsilane,
Wherein the flame retardant comprises cresyl diphenyl phosphate or isopropyl phenyl diphenyl phosphate,
When the pyrolysis initiation temperature by the thermogravimetric analysis method is 310 占 폚 or higher
Thermosetting foam.
The method according to claim 1,
The flame retardant may be in liquid or powder form
Thermosetting foam.
The method according to claim 1,
The content of the flame retardant is 1 part by weight to 20 parts by weight per 100 parts by weight of the polyol compound
Thermosetting foam.
The method according to claim 1,
The content of the nucleating agent is 1 part by weight to 10 parts by weight per 100 parts by weight of the polyol compound
Thermosetting foam.
The method according to claim 1,
Wherein the thermosetting foam further comprises a polymerization catalyst, a surfactant, and a foaming agent
Thermosetting foam.
The method according to claim 1,
The thermosetting foam has a thermal conductivity of 0.025 W / mk or less
Thermosetting foam.
The method according to claim 1,
The thermosetting foam preferably has a closed cell ratio of 80%
Thermosetting foam.
The method according to claim 1,
The thermosetting foam has a density of 10 kg / m ³ to 150 kg / m ³
Thermosetting foam.