KR102015093B1 - Cryogenic Insulation Panel And Method for Manufacturing the Same - Google Patents

Abstract

The present invention relates to a cryogenic heat insulating material having a structure in which a plurality of polymer foam layers having different densities are continuously stacked by foam molding by mixing a blowing agent in polyol and isocyanate at different mixing ratios, and a method for manufacturing the same. In the method for preparing a polyol and isocyanate, a foaming agent is mixed at different mixing ratios to prepare a plurality of mixtures, and each of the prepared mixtures is continuously charged at a time interval in a foaming vessel and foam molded to have different densities. It is characterized by laminating a plurality of polymer foam layers.

Description

Cryogenic Insulation Panel And Method for Manufacturing the Same

The present invention relates to a cryogenic insulation, and more particularly, to use for thermal insulation in cryogenic environments, such as cryogenic tanks, cryogenic insulation made of a plurality of polymer foam layers having different densities and a method of manufacturing the same. It is about.

As interest in marine environmental pollution has recently increased, international environmental regulations for reducing air pollutants by ships and preventing marine environmental pollution have been tightened. In particular, certain countries prohibit entry in order to protect their species and prevent marine damage if they do not comply with these regulations.

Attention is drawn to LNG fueled ships. LNG can reduce emissions of sulfur oxides (SOx), nitrogen oxides (NOx), and carbon dioxide by 100%, 80%, and 23%, respectively, compared to existing marine diesel, which can meet current international environmental standards for ships, EEDI and ECA. It is rated as the only environmentally friendly fuel.

However, LNG is a material that is made by liquid-cooling the natural gas into a liquid state, and requires a cryogenic tank in a ship to use it as a fuel. In addition, to maintain the cryogenic environment of the tank, it is necessary to use a thicker insulation than conventional. Increasing the thickness of the insulation reduces the natural vaporization rate (BOR) of natural gas to prevent the loss of LNG, there is a disadvantage that lowers the cargo and fuel load of the limited space ship.

In order to overcome this problem, researches have been made to improve the insulation performance of polyurethane foam, which is widely used as a heat insulating material for ships, but its practicality is poor due to the decrease in strength compared to the improvement of insulation performance.

Accordingly, a heat insulating material having a heat insulating structure composed of a double layer by bonding a polyurethane foam with a heterogeneous material has been developed. However, as the number of layers increases, the bonding process continues to increase.

In order to improve the mechanical performance and thermal insulation performance, insulation materials are manufactured using various reinforcing agents such as glass fiber or aerogel powder, but if the reinforcing agent interferes with cell formation during foaming, the thermal insulation performance and mechanical performance deteriorate due to cell destruction. In order to solve this problem, additional chemical processes such as surface modification are required.

For cryogenic insulation systems for ships that must be mass-produced, much time and effort is required to address these two limitations, which is directly related to the economics of the product.

Registered Patent No. 10-0765802 (registered on October 4, 2007) Registered Patent No. 10-0592052 (registered on June 14, 2006) Registered Patent No. 10-0613164 (registered Aug. 09, 2006)

The present invention is to solve the above problems, the object of the present invention is to manufacture a plurality of polymer foam (foam) layer having a different density by continuously foaming without a separate bonding process to manufacture easily and quickly In addition, the present invention provides a cryogenic insulation material and a method of manufacturing the same that can simultaneously provide excellent thermal insulation performance and mechanical strength performance.

The cryogenic heat insulating material according to the present invention for achieving the above object has a structure in which a plurality of polymer foam layers having different densities are continuously stacked by foam molding by mixing a blowing agent in polyol and isocyanate at different mixing ratios.

According to one aspect of the present invention, the cryogenic insulation of the present invention may further comprise a silica airgel layer laminated between the polymer foam layers.

In addition, the cryogenic heat insulating material of the present invention may be foam-molded by mixing the pigments of different colors together during the foam molding of each polymer foam layer.

In the method for producing the cryogenic insulation of the present invention, a polyol and isocyanate are mixed with a blowing agent in different blending ratios to prepare a plurality of mixtures, and each of the prepared mixtures is continuously introduced into the foaming container at a time interval and foamed and molded. A plurality of polymer foam layers having different densities are laminated.

According to one embodiment of the present invention, when a mixture is introduced into a foaming container, a silica aerogel powder is injected thereon, and heated, a mixture is foamed to form a polymer foam layer, and a silica aerogel layer is integrally stacked thereon. Different mixtures may be added to the silica airgel layer to stack polymer foam layers having different densities.

And when the mixture is prepared by mixing the blowing agent in polyol and isocyanate, the mixture may be prepared by mixing the pigments together.

According to another aspect of the present invention, the plurality of mixtures may be prepared to form a polymer foam layer to be laminated after forming each polymer foam layer.

According to the present invention, cryogenic insulation may be prepared by mixing polyurethane foams having different densities into a plurality of layers by mixing foaming agents in polyols and isocyanates at different mixing ratios and continuously foaming them. Therefore, excellent heat insulating performance can be obtained by the polyurethane foam layer having a relatively low density, and excellent mechanical strength can be obtained by the polyurethane foam layer having a relatively high density.

In addition, the cryogenic heat insulating material of the present invention can be laminated between the polymer foam layer having a different density, the porous layer of silica airgel is laminated to further improve the heat insulating performance of the heat insulating material, as well as to ensure that the foam cell is compact and the cell homogeneity. have.

1 is a cross-sectional view of a cryogenic heat insulating material according to an embodiment of the present invention.
FIG. 2 is a schematic diagram sequentially illustrating a method of manufacturing the cryogenic insulation shown in FIG. 1.

Configurations shown in the embodiments and drawings described herein are only exemplary embodiments of the disclosed invention, there may be various modifications that can replace the embodiments and drawings of the present specification at the time of filing of the present application.

Hereinafter, with reference to the accompanying drawings will be described in detail the cryogenic insulation and its manufacturing method according to the embodiments described below. Like reference numerals in the drawings denote like elements.

Referring to FIG. 1, the cryogenic insulation material according to an embodiment of the present invention includes a plurality of polymer foam layers 11, 12, and 13 having different densities, and between the polymer foam layers 11, 12, and 13. And laminated silica integrated airgel layers 21 and 22.

The plurality of polymer foam layers 11, 12, and 13 are continuously foamed and integrated in a foaming container without a separate bonding process. The plurality of polymer foam layers 11, 12 and 13 are polyurethane foams which are foam-molded by mixing foaming agents in different blending ratios of polyol and isocyanate, respectively, and each of the polymer foam layers 11, 12 and 13 according to the blending ratio of foaming agents. Will have a different density. That is, the density becomes small when the compounding ratio of a blowing agent becomes large, and it becomes large when the compounding ratio of a foaming agent becomes small. Low density polyurethane foam has good thermal insulation but relatively low mechanical strength. High density polyurethane foam has low thermal insulation but good mechanical strength.

Therefore, the cryogenic heat insulating material of the present invention has excellent thermal insulation performance and mechanical strength because the polymer foam layers 11, 12, and 13, which are polyurethane foams having different densities, are composed of multiple layers.

In this embodiment, the polymer foam layers 11, 12, and 13 are composed of three layers, and the polymer foam layer 11 disposed at the bottom of the drawing has the smallest density, and the polymer foam layer 12 of the intermediate layer stacked directly thereon. The density of is greater than that of the lowermost polymer foam layer 11, and the density of the polymer foam layer 13 disposed on the uppermost is the largest. For example, the density of the lowermost polymer foam layer 11 is 130 kg / m 3, the density of the intermediate polymer foam layer 12 is 155 kg / m 3, and the uppermost polymer foam layer 13 may be 180 kg / m 3.

The lowest density of the polymer foam layer 11 having the smallest density has the lowest mechanical strength but the highest thermal insulation performance, so the inner insulation layer of the insulation material adjacent to the outer wall surface of the structure, for example, the LNG tank, is applied to the insulation material of the present invention. In this case, the polymer foam layer 13 having the highest density has the greatest mechanical strength, and therefore, it is preferable to form the outer heat insulating layer of the heat insulating material.

Polyol and isocyanate for each polymer foam layer (11, 12, 13) and in order to easily check the density of the plurality of polymer foam layers (11, 12, 13) when the heat insulating material of the present invention is installed in the cryogenic structure Pigments of different colors can be mixed with the mixture of blowing agents to ensure that each of the polymer foam layers 11, 12, 13 has a different specific color.

As the foaming agent for forming the polymer foam layers 11, 12, and 13, a foaming agent applied to a known foaming urethane foam may be applied. For example, cyclopentane, normal pentane, iso Pentane, methylene chloride, hexane, acetone and the like can be used.

Between the plurality of polymer foam layers 11, 12, and 13, silica aerogel layers 21 and 22 formed by uniformly spraying silica aerogel powder are polymer layers 11, 12, and 13 directly above and below. ) Is integrated. Silica airgel layer (21, 22) is a structure with a lot of pores to further improve the thermal insulation performance of the heat insulating material, and the foam cell is compact and uniform cell arrangement is possible to ensure the homogeneity of the cell.

When explaining the cryogenic insulation of the present invention with reference to Figure 2 as follows.

First, a polyol, an isocyanate, and a blowing agent are prepared in a weight ratio of 100: 116: 6 (S1), and the mixture is stirred evenly at 4500 rpm for 1 minute with a homogenizer to prepare a first mixture (S2). In this case, by mixing the pigment of a specific color together, the polymer foam layer 11 may have a specific color when the polymer foam layer 11 is made by foaming the mixture in a subsequent process.

Then, the prepared first mixture is poured into the foaming vessel (C) (S3), and the silica aerogel powder is uniformly dispersed and supplied by a powder distribution system (powder distribution system) thereon, and the mixture is foamed and the first polymer foam layer ( 11) is made, and the silica airgel layer 21 is integrally laminated thereon (S4).

Subsequently, after a predetermined time (for example, about 15 minutes) has elapsed, the polyol, isocyanate, and blowing agent are prepared in a ratio of 100: 116: 5 by weight ratio (S5), which is evenly applied at 4500 rpm for 1 minute with a homogenizer. Stirring to prepare a second mixture (S6). At this time, the pigment of a specific color different from before is mixed together.

The second mixture thus mixed is poured into the foaming vessel (C) and laminated on the first polymer foam layer 11 and the silica aerogel layer 21 foamed and molded in the foaming vessel (C) (S7), and a powder feeder thereon. The silica aerogel powder is uniformly dispersed and supplied as a system) and then heated to form a second polymer foam layer 12 and a silica aerogel layer 22 (S8).

After another 15 minutes, the polyol, isocyanate and blowing agent were prepared in a weight ratio of 100: 116: 4 (S9), mixed with pigments of different colors, and then mixed with a homogenizer for 1 minute. By stirring evenly at 4500rpm to prepare a third mixture (S10).

Subsequently, the third mixture is poured into the foaming vessel (C), stacked on the second polymer foam layer 12 and the silica aerogel layer 22 foamed and molded in the foaming vessel C, and heated and foamed to form a third polymer foam layer 13 ( S11).

When the polymer foam layers 11, 12, and 13 are stacked in a desired number of stages (three steps in this embodiment) through the above-described process, the polymer foam layers 11, 12, and 13 are cured for about 24 hours and then drawn out in the foam container C (S12). This completes a multi-layered heat insulating material in which a plurality of polymer foam layers 11, 12, 13 and silica airgel layers 21, 22 having different densities are integrated.

The blending ratio of the polyol, isocyanate and blowing agent shown in the examples of this manufacturing method is one of the preferred blending ratios among various blending ratios and may be carried out in various blending ratios. In addition, the pigment mixed with the polyol, the isocyanate and the blowing agent is preferably mixed with 0.2 to 3.0% by weight of the total weight of the polyol, the isocyanate and the blowing agent, and the type of pigment may be used a conventional pigment used in a known polyurethane foam Can be.

As described above, the heat insulating material of the present invention may form polyurethane foams having different densities in a plurality of layers by mixing a foaming agent in polyol and isocyanate at different blending ratios and continuously foam molding. Therefore, excellent heat insulating performance can be obtained by the polymer foam layer having a relatively low density, and excellent mechanical strength can be obtained by the polymer foam layer having a relatively high density.

Although the present invention has been described in detail with reference to the embodiments, those skilled in the art to which the present invention pertains will be capable of various substitutions, additions, and modifications without departing from the technical spirit described above. It is to be understood that such modified embodiments are also within the protection scope of the present invention as defined by the appended claims.

11, 12, and 13: polymer foam layer
21, 22 silica silica gel layer
C: Foam Container

Claims (7)

delete delete delete A plurality of mixtures are prepared by mixing a blowing agent with polyol and an isocyanate in different mixing ratios, and each of the prepared mixtures and silica aerogel powders are continuously introduced into the foaming container at a time interval and foamed to form a plurality of mixtures having different densities. A method of manufacturing a cryogenic heat insulating material in which a polymer foam layer is laminated and a silica air gel layer is integrally laminated between each polymer foam layer,
When the polymer foam layer and the silica aerogel layer are laminated, one of the mixtures is put into a foaming container, and the silica aerogel powder is dispersed and supplied thereon, followed by heating, thereby forming a polymer foam layer by foaming the mixture and simultaneously foaming the mixture. A method for producing a cryogenic insulation material which is laminated while a silica airgel layer is integrated on a polymer foam layer. delete The method of claim 4, wherein the pigment is mixed together to prepare the mixture when the blowing agent is mixed with the polyol and the isocyanate to prepare the mixture. The method of claim 4, wherein
(a) mixing the blowing agent with the polyol and isocyanate in a first blending ratio to produce a first mixture;
(b) injecting the first mixture into the foam container (C) and dispersing the silica aerogel powder thereon;
(c) heating the foam container (C) to foam the first mixture to form the first polymer foam layer and thereon to integrally stack the first silica airgel layer thereon;
(d) mixing the blowing agent with the polyol and the isocyanate in a second blending ratio to produce a second mixture;
(e) adding the second mixture into the foaming vessel (C), and dispersing and supplying the silica aerogel powder thereon;
(f) heating the foam container (C) to foam the second mixture to form a second polymer foam layer, thereby allowing the second silica airgel layer to be integrally stacked thereon;
(g) mixing a blowing agent with a polyol and an isocyanate in a third blending ratio to produce a third mixture;
(h) introducing the third mixture into the foam container (C);
(i) heating the foam container (C) to foam a third mixture to form a third polymer foam layer;
(j) After curing for a predetermined time, the cryogenic insulation material having the first polymer foam layer, the first silica air gel layer, the second polymer foam layer and the second silica air gel layer, and the third polymer foam layer sequentially stacked in the foam container (C) are drawn out. Making;
Method for producing a cryogenic insulation comprising a.

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