KR20200093884A - Composition for polyurethane foam having excellent thermal insulation property using eco-friendly foaming agent and method for manufacturing thereof - Google Patents

Abstract

According to an embodiment of the present invention, provided is a composition for polyurethane foam, comprising: 20 to 100 parts by weight of a polyether polyol having an OH value of 200 to 550 mg·KOH/g; 10 to 30 parts by weight of a polyester polyol having an OH value of 150 to 250 mg·KOH/g; 100 to 150 parts by weight of methylene diphenyl diisocyanate (MDI); and 0.1 to 20 parts by weight of methyl formate.

Description

Composition for polyurethane foam with excellent heat insulation using eco-friendly foaming agent and method for manufacturing the same TECHNICAL TECHNOLOGY

The present invention relates to an environment-friendly rigid urethane foam for building interior use that improves heat insulation and flame retardancy than an existing system using an eco-friendly foaming agent.

Recently, in the domestic housing construction market, interest in passive houses, which can minimize energy waste, has increased rapidly. In contrast to an active house that actively draws energy, it is a concept opposite to that of an active house, and in the construction of a passive house, thermal insulation of materials is regarded as the most important property.

Polyurethane foam is often used as a construction material, such as insulation, because it can be constructed by simple methods such as spray spraying and its thickness is relatively easy to control. Specifically, polyurethane foam is used in a wide range of areas such as residential buildings, low-temperature warehouses, frozen warehouses, and other buildings, or construction materials such as prefabricated panels, ships, and home appliances.

Polyurethane foam usually has a porous or honeycomb foam structure, and is prepared by mixing polyester or polyether-based polyol with polyfunctional diisocyanate as a main raw material, and mixing various additives such as catalysts, foam stabilizers, dispersants, and blowing agents. do.

In the past, research to improve the properties of polyurethane foams has been conducted steadily, and research and development to improve flame retardancy or heat insulation has been mainly conducted. However, it does not reach the degree to meet the physical property standards of the aforementioned passive house, and in particular, it is difficult to secure the properties of the polyurethane foam in terms of heat insulation, adhesion, and thickness of the construction surface.

Accordingly, there is a need to develop a polyurethane foam capable of securing economical efficiency by reducing the thickness of the construction surface while reducing energy loss by itself having excellent thermal insulation properties.

In addition, the existing HCFC-141B foaming system is an ozone-depleting substance, and is already banned in developed countries. Therefore, in the future, since it is not possible to use the ozone-depleting substance HCFC-141B foaming agent, it is necessary to develop a rigid urethane foam excellent in heat insulation and flame retardancy compared to the existing foaming agent by using an eco-friendly foam foaming agent as an alternative.

The present invention is to solve the problems of the above-described prior art HCFC-141B foam is a rigid urethane foam is used, the object of the present invention is an polyurethane foam for improving the flame retardancy and heat insulation more than when using the existing foaming agent using an environmentally friendly foaming agent It is to provide a composition and a manufacturing method.

In addition, according to the present invention, when the heat insulating properties of the rigid urethane foam layer, which is a base material layer constituting one surface of the heat insulating material, are compared with the conventional technology, the structure of the pore structure and the cell pore type between the open cell and the closed cell correlation are obtained through a mixture of appropriate compound structures. It relates to an eco-friendly hard urethane foam that effectively constitutes a thermal conductivity through proper harmony.

However, the problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those having ordinary knowledge in the art from the following description.

According to an embodiment of the present invention, the hydroxyl value (OH value) of 200 to 550mg · KOH / g polyether polyol 20 to 100 parts by weight; 10-30 parts by weight of a polyester polyol having a hydroxyl value of 150-250 mg·KOH/g; Methylene diphenyl diisocyanate (MDI) 100 to 150 parts by weight; And methyl formate (Methyl formate) 0.1 to 20 parts by weight; including, polyurethane foam composition is provided.

According to one side, the polyether polyol, the first polyether polyol having a hydroxyl value of 200 to 250 mg·KOH/g and a number average molecular weight of 600 to 800, and a hydroxyl value of 450 to 550 mg·KOH/g and a number average molecular weight of The second polyether polyol of 350 to 550 may be included.

According to one side, the polyester polyol may have a number average molecular weight of 500 to 600.

According to one side, the methylene diphenyl diisocyanate may have an NCO content of 31 to 48% by weight.

According to one side, the composition for the polyurethane foam may further include 2 to 20 parts by weight of a mixture consisting of a siloxane copolymer, polycarbonate, sodium silicate and muscovite.

According to one side, the content of each component constituting the mixture may be 0.5 to 1.5 parts by weight of siloxane copolymer, 1 to 4 parts by weight of polycarbonate, 4 to 6 parts by weight of sodium silicate, and 8 to 12 parts by weight of muscovite.

According to another embodiment of the present invention, a polyurethane foam formed using the composition for polyurethane foam is provided.

According to one side, the polyurethane foam may have an apparent density of 24 to 30 kg/m 3 and a thermal conductivity of 0.025 to 0.045 W/m·K.

According to another embodiment of the present invention, (a) a hydroxyl value (OH value) of 200 to 550 mg·KOH/g polyether polyol 20 to 100 parts by weight, a hydroxyl value of 150 to 250 mg·KOH/g poly Mixing 10 to 30 parts by weight of ester polyol and 0.1 to 20 parts by weight of methyl formate; And (b) adding 100 to 150 parts by weight of methylene diphenyl diisocyanate (MDI) to the result of step (a).

According to one side, 2 to 20 parts by weight of the mixture consisting of a siloxane copolymer, polycarbonate, sodium silicate and muscovite may be further mixed in the step (a).

According to one side, the content of each component constituting the mixture may be 0.5 to 1.5 parts by weight of siloxane copolymer, 1 to 4 parts by weight of polycarbonate, 4 to 6 parts by weight of sodium silicate, and 8 to 12 parts by weight of muscovite.

The composition for a polyurethane foam of the present invention can improve the heat insulating properties of a polyurethane foam by adding a certain amount of methyl formate as an auxiliary foaming agent. In addition, the insulation of the polyurethane foam can be further improved by further including a mixture of siloxane copolymer, polycarbonate, sodium silicate, and muscovite.

Through the improvement of the heat insulation, it is possible to manufacture a construction surface with a relatively thin thickness, thereby improving the economic efficiency in terms of cost, such as reduction in manufacturing cost.

In addition, the present invention can drastically improve the disadvantages of poor adhesion and heat insulation properties of conventional rigid urethane foam applied to insulation and sound insulation materials for construction purposes, and the insulation properties that are gradually in the expansion phase in the domestic housing construction market in recent years. According to the rapid increase in interest in the passive house (passive house) with a focus on construction can reduce the thickness of the construction and reduce the construction cost.

In addition, the present invention significantly reduces the thickness reduction in construction from the previous 40~60mm thickness to about 25~40mm, which is reduced by 1/3, compared to the conventional rigid urethane foam for architectural use. Due to this, it is possible to reduce the cost of construction and to improve the price competitiveness, as well as to improve the thermal insulation performance as a building application despite lowering the thickness.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be deduced from the configuration of the invention described in the detailed description or claims of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. Various modifications may be made to the embodiments described below. The examples described below are not intended to be limiting with respect to the embodiments, and should be understood to include all modifications, equivalents, or substitutes thereof.

The terms used in the examples are only used to describe specific examples, and are not intended to limit the examples. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “include” or “have” are intended to indicate that there are features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the embodiment belongs. Terms, such as those defined in a commonly used dictionary, should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

In addition, in the description of the embodiments, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the embodiments, the detailed description will be omitted.

Composition for polyurethane foam and polyurethane foam

According to an embodiment of the present invention, the hydroxyl value (OH value) of 200 to 550mg · KOH / g polyether polyol 20 to 100 parts by weight; 10-30 parts by weight of a polyester polyol having a hydroxyl value of 150-250 mg·KOH/g; Methylene diphenyl diisocyanate (MDI) 100 to 150 parts by weight; And methyl formate (Methyl formate) 0.1 to 20 parts by weight; including, polyurethane foam composition is provided.

The polyether polyol and the polyester polyol react with methylene diphenyl diisocyanate to form a polyurethane resin, and the excess methylene diphenyl diisocyanate remaining after reacting with the polyol causes a crosslinking reaction between polyurea and polyurethane to be described later. You can form my network structure.

At this time, when the hydroxyl value (OH value) of the polyether polyol is less than 200 mg·KOH/g or the hydroxyl value of the polyester polyol is less than 150 mg·KOH/g, the mechanical strength of the polyurethane foam may deteriorate. When the hydroxyl value of the ether polyol is more than 550 mg·KOH/g or the hydroxyl value of the polyester polyol is more than 250 mg·KOH/g, moldability or adhesion may be deteriorated.

In addition, when the content of the polyether polyol is less than 20 parts by weight or the content of the polyester polyol is less than 10 parts by weight, the formation of the polyurethane resin may not be sufficient, and on the contrary, the content of the polyether polyol is more than 100 parts by weight or polyester If the content of the polyol is more than 30 parts by weight, the excess methylene diphenyl diisocyanate content is small, so crosslinking reaction may not occur sufficiently.

The polyether polyol and polyester polyol are ethylene glycol, propylene glycol, butanediol, pentanediol, 1,6-hexanediol, neopentyl glycol, trimethylolpropane, glycerin, pentaerythritol, quinitol, diethylene glycol, triethylene It may be two or more compounds selected from the group consisting of glycol, tetraethylene glycol, polyethylene glycol, polypropylene glycol, diglycerin, dextrose and sorbitol, but is not limited thereto.

On the other hand, the polyether polyol may be used alone or in combination of a number of components. Accordingly, the polyether polyol has a first polyether polyol having a hydroxyl value of 200 to 250 mg·KOH/g and a number average molecular weight of 600 to 800, and a hydroxyl value of 450 to 550 mg·KOH/g and a number average molecular weight of the polyether polyol. 350 to 550 may include a second polyether polyol, but is not limited thereto.

The polyester polyol may secure a mechanical property for providing a rigid polyurethane foam with realizing heat insulation performance by using a number average molecular weight within a certain range. Specifically, the polyester polyol may have a number average molecular weight of 500 to 600. If the number average molecular weight is less than 500, adhesion of the polyurethane foam may decrease or cracks may occur after construction. Physical properties may deteriorate.

The methylene diphenyl diisocyanate may react with water, which is a chemical blowing agent, to form polyurea resin while generating carbon dioxide. The aforementioned polyurethane and the polyurea resin undergo a crosslinking reaction with an extra methylene diphenyl diisocyanate. At this time, if the NCO content of the methylene diphenyl diisocyanate is less than 31% by weight, sufficient crosslinking reaction may not be achieved. If it is more than 48% by weight, unnecessary by-products may be generated in the process of preparing the composition for forming a polyurethane foam due to the presence of excessive functional groups.

Isocyanate-based compounds containing methylene diphenyl diisocyanate are usually used to form crosslinking reactions, and specific types include aromatic, alicyclic, aliphatic polyisocyanates, mixtures thereof, and modified polyisocyanates obtained by modifying them. Can.

More specifically, a compound having two isocyanate groups in one molecule is used, for example, ethylene diisocyanate, toluene diisocyanate, tolylene diisocyanate, naphthalene diisocyanate, xylene diisocyanate, methylene diphenyl diisocyanate, tetramethyl xylene Diisocyanate, polymethylene polyperylene isocyanate, hydrogenated methylene diphenyl diisocyanate, hydrogenated tolylene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, trimethylene hexamethylene diisocyanate, lysine diisocyanate and mixtures or modified products thereof, etc. However, it is not limited to this. In addition, the modified product may include a prepolymer-type modified product, a reaction product of polyisocyanate and polyol, a urea-modified product, a urea-modified product, a carbodiimide-modified product, an allophanate-modified product, a biuret-modified product, and the like. It does not work.

The polyurethane foam composition may include an organometallic catalyst and an amine catalyst to improve reactivity. As the organometallic catalyst, metal compounds such as tinoctoate, dioctyltin dilaurate, dibutyltin, and tin tin oleate may be used, but are not limited thereto. Further, examples of the amine catalyst include bis-dimethylaminoethyl ether, triethyleneamine, triethylenediamine, diethanolamine, dimethylaminomorpholine, triethanolamine dimethylbenzylamine, dimethylethanolamine, benzyldimethylamine, and pentamethyldiethylenetri An amine or the like can be used, but is not limited thereto. The organometallic catalyst and the amine-based catalyst may be used alone or in combination of two or more, and the content of 0.01 to 5 parts by weight compared to 100 parts by weight of polyol may be added.

In addition, the polyurethane foam composition may further include a foam stabilizer (surfactant) for improving the miscibility between components by lowering the surface tension, and controlling the size or number of pores within a certain range. Examples of the type include anionic surfactants such as silicone-based surfactants having a polydimethylsiloxane and polyoxyalkylene chain, fatty acid salts, sulfate ester salts, phosphate ester salts, and sulfonate salts, and 100 parts by weight of the polyol component. It can be added in an amount of 0.1 to 10 parts by weight.

The polyurethane foam composition may use water, preferably distilled water, as a foaming agent component, and may adjust the number of pores together with the density of the foam according to the amount of water added. Specifically, 0.5 to 3.5 parts by weight of water may be added to 100 parts by weight of the polyol.

However, when water is used as the sole foaming agent component, there is a problem that the internal deterioration rapidly progresses as the foaming rate increases, thereby suppressing internal evaporation latent heat by additionally mixing an auxiliary foaming agent such as methyl formate. At the same time, it is possible to further improve the heat insulation properties. At this time, if the content of methyl formate is less than 0.1 part by weight, the effect of addition may be negligible, and if it is more than 20 parts by weight, economical efficiency may be deteriorated in an amount more than necessary.

On the other hand, in addition to improving the physical properties using methyl formate, the polyurethane foam composition can further improve heat insulation by further comprising 2 to 20 parts by weight of a mixture of siloxane copolymer, polycarbonate, sodium silicate and muscovite. In addition, the content of each of these components may be 0.5 to 1.5 parts by weight of siloxane copolymer, 1 to 4 parts by weight of polycarbonate, 4 to 6 parts by weight of sodium silicate and 8 to 12 parts by weight of muscovite, preferably 1 part by weight of siloxane copolymer Part, 2.5 parts by weight of polycarbonate, 5 parts by weight of sodium silicate and 10 parts by weight of muscovite.

According to another embodiment of the present invention, a polyurethane foam formed using the composition for polyurethane foam is provided. While foaming the composition for the polyurethane foam can be applied to the construction surface to form a polyurethane foam, and at this time, the composition can be applied by a simple method using a spray gun, but is not limited thereto, polyurethane Any known method for foaming and applying the foam can be used.

Another embodiment of the present invention may include an environmentally friendly rigid urethane foam for building interior use. In addition, another embodiment of the present invention may have a harmonized structure of a porous open-cell and a closed-cell in order for the environment-friendly hard urethane foam base layer to have excellent thermal insulation properties. That is, in another embodiment of the present invention, the heat insulating properties of the rigid urethane foam layer, which is a base layer constituting one surface of the heat insulating material, are compared with the regularity of the pore structure and the correlation between the open cell and the closed cell through a mixture of appropriate compound structures when compared with the conventional technology. By appropriately matching the cell pore shape, it may include an environmentally friendly rigid urethane foam that can effectively configure the thermal conductivity.

The polyurethane foam is applied to a passive house that requires a higher level of thermal insulation as well as thermal insulation for use in conventional building materials, thereby reducing heat loss. Specifically, the polyurethane foam has an apparent density of 24 to 30 kg/m 3, preferably 24 to 30 kg/m 3, and a thermal conductivity of 0.025 to 0.045 W/m·K, preferably 0.025 to 0.043 W/m· It can be K.

Manufacturing method of polyurethane foam composition

According to another embodiment of the present invention, (a) a hydroxyl value (OH value) of 200 to 550 mg·KOH/g polyether polyol 20 to 100 parts by weight, a hydroxyl value of 150 to 250 mg·KOH/g poly Mixing 10 to 30 parts by weight of ester polyol and 0.1 to 20 parts by weight of methyl formate; And (b) adding 100 to 150 parts by weight of methylene diphenyl diisocyanate (MDI) to the result of step (a). A method for preparing a composition for polyurethane foam is provided.

In the step (a), a polyether polyol, a polyester polyol, and methyl formate may be mixed to prepare in the first stream line, and flame retardants, foam stabilizers, catalysts, and blowing agents may be further mixed as additional components. The contents of the polyol type, hydroxyl value and content, and other additives are as described above.

In addition, in the step (a), 2 to 20 parts by weight of the mixture consisting of a siloxane copolymer, polycarbonate, sodium silicate, and muscovite may be further mixed. Specifically, the content of each component constituting the mixture may be 0.5 to 1.5 parts by weight of siloxane copolymer, 1 to 4 parts by weight of polycarbonate, 4 to 6 parts by weight of sodium silicate, and 8 to 12 parts by weight of muscovite. The improvement of physical properties through these mixtures is as described above.

Meanwhile, in step (b), methylenediphenyldiisocyanate may be prepared in the second stream line separately from the result of step (a). At this time, the NCO content of the methylene diphenyl diisocyanate is the same as described above.

Then, the composition for the polyurethane foam can be prepared by spraying the result of step (a) prepared in the first stream line and the methyl diphenyl diisocyanate prepared in the second stream line at an appropriate pressure.

Hereinafter, the present invention will be described in more detail through examples. The following examples are described for the purpose of illustrating the present invention, and the scope of the present invention is not limited thereto.

Example 1

50 kg of polyether polyol (polyol-1) having a hydroxyl value of 225 mg·KOH/g and a number average molecular weight of 700, polyether polyol having a hydroxyl value of 500 mg·KOH/g and a number average molecular weight of 450 (polyol-2) 30 20 kg of polyester polyol (polyol-3) having a kg and hydroxyl value of 200 mg·KOH/g and a number average molecular weight of 560, 25 kg of a flame retardant (organic phosphorus-based compound), antifoaming agent (copolymer of polyalkylene oxide and dimethyl siloxane) ) 1kg, tin catalyst 0.5kg, amine catalyst (Bis(2-(dimethylamino)ethyl)ether) 2kg, distilled water 3.5kg, methyl formate 1kg After the injection, the mixture was mixed for 3 minutes at 4,000 rpm at room temperature and stored in the first stream line.

On the other hand, 140 kg of a methylene diphenyl diisocyanate (MDI) solution having an NCO content of 32% by weight was separately stored in a second stream line.

A composition for polyurethane foam was prepared by mixing the mixture of the first stream line and the MDI solution of the second stream line while adjusting the discharge injection pressure alternately under low pressure conditions of 3 to 5 bar and high pressure conditions of 150 to 200 bar.

Example 2

A composition for a polyurethane foam was prepared under the same conditions as in Example 1, except that the content of methyl formate was adjusted to 3 kg.

Example 3

A composition for a polyurethane foam was prepared under the same conditions as in Example 1, except that the content of methyl formate was adjusted to 5 kg.

Example 4

A composition for a polyurethane foam was prepared under the same conditions as in Example 1, except that the content of methyl formate was adjusted to 10 kg.

Example 5

A composition for a polyurethane foam was prepared under the same conditions as in Example 1, except that the content of methyl formate was adjusted to 15 kg.

Comparative example

A composition for a polyurethane foam was prepared under the same conditions as in Example 1, except that the input of methyl formate to the first stream line was omitted.

The specific contents of each component constituting the polyurethane foam composition of Examples 1 to 5 and Comparative Examples are shown in Table 1 below.

division Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example Polyol-1 50 50 50 50 50 50 Polyol-2 30 30 30 30 30 30 Polyol-3 20 20 20 20 20 20 MDI 140 140 140 140 140 140 Flame retardant 25 25 25 25 25 25 Antifoam One One One One One One Tin catalyst 0.5 0.5 0.5 0.5 0.5 0.5 Amine catalyst 2 2 2 2 2 2 Distilled water 3.5 3.5 3.5 3.5 3.5 3.5 Methyl formate One 3 5 10 15 -

(Unit: kg)

Experimental Example 1: Measurement of physical properties according to the presence and content of methyl formate

To measure the physical properties of the polyurethane foam compositions according to Examples 1 to 5 and Comparative Examples, a construction body was produced while foaming each composition using a spray gun.

For each construction body, physical properties were evaluated according to the methods specified below, and the results are shown in Table 2 below.

-Apparent density: KS M 3809; 2006

-Thermal conductivity: KS M3809; 2006, plate thermal mooring method

-Number of pores: SEM image

division Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example Apparent density
(㎏/㎥) 27.52 27.10 26.42 25.13 25.03 28.92 Thermal conductivity
(W/m·k) 0.043 0.042 0.041 0.040 0.040 0.046 Number of pores
(ppi) 75 75 80 90 90 70

Referring to the results of Table 2, the polyurethane foams of Examples 1 to 5 in which methyl formate was added and mixed compared to the polyurethane foam of the comparative example without methyl formate added had a large number of pores and showed a low apparent density. It can be seen that this leads to a decrease in thermal conductivity.

In addition, when looking at the results of Examples 1 to 5, it can be seen that as the content of methyl formate increases, the number of pores gradually increases, the apparent density decreases, and the thermal conductivity gradually decreases.

Summarizing these results, it can be seen that by adding an eco-friendly foaming agent, methyl formate, as an auxiliary foaming agent, it is possible to improve the thermal insulation properties of the polyurethane foam, and by increasing its content to a certain level, more excellent effects can be realized.

Example 6

The same conditions as in Example 4 were carried out in the same manner as in Example 4, except that 2.5 kg of a mixture of siloxane copolymer, polycarbonate, sodium silicate, and muscovite mixed in a weight ratio of 1: 2.5: 5: 10 was added to the first stream line. A composition for urethane foam was prepared.

Example 7

Poly in the same conditions as in Example 4, except that 5 kg of a mixture in which the siloxane copolymer, polycarbonate, sodium silicate, and muscovite mica were mixed at a weight ratio of 1: 2.5: 5: 10 was added to the first stream line. A composition for urethane foam was prepared.

Example 8

Poly in the same conditions as in Example 4, except that 7.5 kg of a mixture in which the siloxane copolymer, polycarbonate, sodium silicate, and muscovite was mixed at a weight ratio of 1:2.5:5:10 was added to the first stream line, respectively. A composition for urethane foam was prepared.

Example 9

Poly in the same conditions as in Example 4, except that 10 kg of a mixture in which the siloxane copolymer, polycarbonate, sodium silicate, and muscovite mica were mixed at a weight ratio of 1: 2.5: 5: 10 was added to the first stream line. A composition for urethane foam was prepared.

Example 10

In the same manner as in Example 4, except that 15 kg of a mixture of siloxane copolymer, polycarbonate, sodium silicate, and muscovite mixed in a weight ratio of 1: 2.5: 5: 10 was added to the first stream line, respectively, except that A composition for urethane foam was prepared.

The specific contents of each component constituting the polyurethane foam composition of Examples 4 and 6 to 10 are shown in Table 3 below.

division Example 4 Example 6 Example 7 Example 8 Example 9 Example 10 Polyol-1 50 50 50 50 50 50 Polyol-2 30 30 30 30 30 30 Polyol-3 20 20 20 20 20 20 MDI 140 140 140 140 140 140 Flame retardant 25 25 25 25 25 25 Antifoam One One One One One One Tin catalyst 0.5 0.5 0.5 0.5 0.5 0.5 Amine catalyst 2 2 2 2 2 2 Distilled water 3.5 3.5 3.5 3.5 3.5 3.5 Methyl formate 10 10 10 10 10 10 mixture - 2.5 5 7.5 10 15

(Unit: kg)

Experimental Example 2: Measurement of physical properties according to the presence and content of the mixture

In order to confirm the effect of the mixture consisting of siloxane copolymer, polycarbonate, sodium silicate and muscovite on the properties of the polyurethane foam, for each of the compositions for polyurethane foam according to Examples 4 and 6 to 10, the Experimental Example 1 The construction body was prepared in the same way and the properties of each were measured, and the results are shown in Table 4 below.

division Example 4 Example 6 Example 7 Example 8 Example 9 Example 10 Apparent density
(㎏/㎥) 25.13 25.44 26.42 27.01 27.47 28.48 Thermal conductivity
(W/m·k) 0.040 0.036 0.033 0.029 0.025 0.025 Number of pores
(ppi) 90 90 90 95 100 100

Referring to Table 4, in the case of the polyurethane foams of Examples 6 to 10 to which the mixture was added, it was confirmed that the number of pores was equal to or higher and the thermal conductivity was lower than Example 4 without the mixture.

In addition, when comparing the results between the polyurethane foams according to Examples 6 to 10, it can be seen that as the content of the mixture increases, the number of pores increases and the thermal conductivity decreases.

However, unlike the results of Experimental Example 1, an increase in pore size did not lead to a decrease in apparent density, which is analyzed as an increase in apparent density as the added mixture fills part of the pores.

As described above, although the embodiments have been described by a limited embodiment and drawings, those skilled in the art can make various modifications and variations from the above description. For example, even if the described techniques are performed in a different order than the described method, and/or the described components are combined or combined in a different form from the described method, or replaced or replaced by another component or equivalent Appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (11)

20 to 100 parts by weight of a polyether polyol having an OH value of 200 to 550 mg·KOH/g;
10-30 parts by weight of a polyester polyol having a hydroxyl value of 150-250 mg·KOH/g;
Methylene diphenyl diisocyanate (MDI) 100 to 150 parts by weight; And
Methyl formate (Methyl formate) 0.1 to 20 parts by weight; containing, polyurethane foam composition.
According to claim 1,
The polyether polyol has a hydroxyl value of 200 to 250 mg·KOH/g and a first polyether polyol having a number average molecular weight of 600 to 800 and a hydroxyl value of 450 to 550 mg·KOH/g and a number average molecular weight of 350 to 550. A composition for a polyurethane foam comprising a second polyether polyol.
According to claim 1,
The polyester polyol has a number average molecular weight of 500 ~ 600, polyurethane foam composition.
According to claim 1,
The methylene diphenyl diisocyanate has a NCO content of 31 to 48% by weight, polyurethane foam composition.
According to claim 1,
The polyurethane foam composition further comprises 2 to 20 parts by weight of a mixture of siloxane copolymer, polycarbonate, sodium silicate and muscovite, polyurethane foam composition.
The method of claim 5,
The content of each component constituting the mixture is 0.5 to 1.5 parts by weight of siloxane copolymer, 1 to 4 parts by weight of polycarbonate, 4 to 6 parts by weight of sodium silicate and 8 to 12 parts by weight of muscovite, polyurethane foam composition.
A polyurethane foam formed using the composition for a polyurethane foam according to any one of claims 1 to 6.
The method of claim 7,
The polyurethane foam has an apparent density of 24 to 30 kg/m 3 and a thermal conductivity of 0.025 to 0.045 W/m·K.
(a) 20 to 100 parts by weight of a polyether polyol having an OH value of 200 to 550 mg·KOH/g, 10 to 30 parts by weight of a polyester polyol having a hydroxyl value of 150 to 250 mg·KOH/g, and methylphore Mixing 0.1 to 20 parts by weight of Mate formate; And
(b) adding 100 to 150 parts by weight of methylene diphenyl diisocyanate (MDI) to the result of the step (a); comprising a method for producing a polyurethane foam composition.
The method of claim 9,
In the step (a), a mixture of siloxane copolymer, polycarbonate, sodium silicate and muscovite is further mixed 2 to 20 parts by weight, a method for preparing a composition for polyurethane foam.
The method of claim 10,
The content of each component constituting the mixture is 0.5 to 1.5 parts by weight of siloxane copolymer, 1 to 4 parts by weight of polycarbonate, 4 to 6 parts by weight of sodium silicate, and 8 to 12 parts by weight of muscovite, a method for preparing a polyurethane foam composition.