KR102555341B1 - CompoPite inPulating material for cargo hold of LNG carrierP including a layer of compoPite material for replacing plywood and itP manufacturing method - Google Patents

Abstract

The present invention is a composite cold insulator in which a primary foam layer and a secondary foam layer are formed so that glass fiber chop is distributed in a foam layer formed by simultaneously spraying glass fiber chop and polyurethane stock solution, and is installed in a hull. LNG carriers including a composite material layer for plywood replacement, characterized in that the workability is convenient because the primary foam layer has the same function as plywood, so there is no need to prepare a separate plywood when installing the composite cold insulation material for cargo hold inside the hull. It relates to composite cold insulation materials for cargo holds.
In the composite insulator for a cargo hold of an LNG carrier according to the present invention, since the glass fiber chops serve as a bridge connecting the foam cells of the insulator, the foam cells of the composite insulator are not easily separated even in the rapid temperature change of the cargo hold, so the durability is excellent, There is an effect that the composite insulator is not easily damaged even in the sudden temperature change of the LNG cargo hold, and in addition, non-woven fabric and multiple layers of glass fiber chop are laminated on the upper surface of the primary foam layer, and then the secondary polyurethane stock solution is used to By forming a foam layer to manufacture a composite cold insulator, the secondary polyurethane stock solution penetrates into the minute space formed in the nonwoven fabric and is bonded to the upper surface of the primary foam layer, thereby improving the adhesive strength between the primary foam layer and the secondary foam layer. Since it is effective, it is expected that demand will increase as a composite coolant used for the cargo hold of LNG carriers in the future.

Description

CompoPite inPulating material for cargo hold of LNG carrierP including a layer of compoPite material for replacing plywood and itP manufacturing method}

The present invention is a composite cold insulator in which a primary foam layer and a secondary foam layer are formed so that glass fiber chop is distributed in a foam layer formed by spraying glass fiber chop and polyurethane stock solution at the same time. The density of the foam layer and the content of glass fiber chop are increased compared to the secondary foam layer so that the primary foam layer in contact with the foam layer has the same function as plywood to improve mechanical properties, and the secondary foam layer provides insulation against rapid temperature changes in the cargo hold. It relates to a composite insulator for a cargo hold of an LNG carrier, including a composite material layer for replacing plywood, characterized in that it has excellent performance and excellent durability by preventing damage to foam cells of the composite insulator so that they are not easily separated, and a method for manufacturing the same.

Demand, production, and export of LNG (Liquified Natural GaP) are continuously increasing globally, and LNG carriers are expected to be required in line with the expansion of liquefaction plant production capacity. Currently, Korea is leading the global LNG carrier construction market, but the technology of the insulated cargo tank (hereinafter referred to as 'cargo hold') that accommodates liquefied natural gas in LNG carriers is still dependent on foreign companies.

In addition, the cargo hold, which is an important technology for LNG carriers, is divided into a membrane type tank integrated with the ship's structure and an independent tank manufactured independently of the ship's structure and supported by a support structure. It is constructed according to the standards of the International Maritime Organization (IMO).

On the other hand, looking at the insulation used in the cargo hold of the conventional LNG carrier, the structure of the cargo hold of the LNG carrier as known in Patent Document 1 is shown in FIG. A barrier 111 is formed, a secondary barrier 112 is formed on the outside of the primary barrier 111, and the outer surface of the secondary barrier 112 is in close contact with the insulating materials 120 in the form of unit panels. made up of a structure

In addition, the insulator used in the cargo hold of the LNG carrier as known in Patent Document 2 has a structure composed of polyurethane foam 3 as the first insulator and polyurethane foam 5 as the second insulator, and the LNG cargo hold is shown in FIG. As shown in the above, it is a structure in which a cargo hold coolant is laminated between the plywood 6 and the membrane metal panel 1, which is a sealing wall in contact with LNG. There was a cumbersome problem that the plywood 6 to be installed on top of the mastic 10 to be delivered must be prepared separately.

Republic of Korea Patent Registration No. 10-1477839 (published on December 30, 2014) International Maritime Organization regulation Type A type independent LNG carrier cargo hold Republic of Korea Patent Registration No. 10-0740767 (published on July 19, 2007) Insulation material for LNG carrier insulation tank

The present invention is an invention derived as a way to improve the problems described above, so that the glass fiber chop is distributed in the foam layer formed by simultaneously spraying the glass fiber chop and the polyurethane stock solution. As a composite cold insulator in which a foam layer and a secondary foam layer are formed, the density of the foam layer and the content of glass fiber chop are increased compared to the secondary foam layer so that the primary foam layer in contact with the mastic of the hull has the same function as plywood. An object of the present invention is to provide a composite cold insulator for a cargo hold of an LNG carrier, including a composite material layer for replacing plywood, and a method for manufacturing the same.

Therefore, when the composite insulator for cargo holds according to the present invention is installed in the hull, the primary foam layer functions like plywood, so when installing the composite insulator for cargo holds in the hull, there is no need to prepare a separate plywood, so the workability is convenient. there is.

In addition, the present invention is a composite cold insulator in which a foam layer is formed using a polyurethane undiluted solution to distribute glass fiber chops. Composite insulator for cargo holds of LNG carriers, including a composite material layer for replacing plywood, characterized in that the foam cells of the insulator are not easily separated and thus have excellent durability, and the composite insulator is not easily damaged even in the sudden temperature change of the LNG cargo hold, and the same Another task is to provide a manufacturing method.

In addition, even in case of leakage of LNG according to the present invention, the composite insulator in a low temperature state is laminated with a nonwoven fabric on the upper surface of the primary foam layer formed by simultaneously spraying primary glass fiber chops and primary polyurethane stock solution, and then By spraying the secondary glass fiber chop and the secondary polyurethane stock solution at the same time to form the secondary foam layer to manufacture a composite cold insulator, the secondary polyurethane stock solution penetrates into the microscopic space formed in the nonwoven fabric to form the primary foam layer. Another task is to provide a composite cold insulator for a cargo hold of an LNG carrier, including a composite material layer for replacing plywood, characterized in that the adhesion between the primary foam layer and the secondary foam layer is improved by being bonded to the upper surface, and a manufacturing method therefor. do it with

A method of manufacturing a composite cold insulator for a cargo hold of an LNG carrier including a composite material layer for replacing plywood according to the present invention includes a release paper supply step (P100) of supplying a release paper 10 to a transfer conveyor (C); The primary glass fiber chops 20 and the primary polyurethane stock solution 30 are simultaneously sprayed on the upper surface of the release paper 10 so that the glass fiber chops are distributed in the polyurethane stock solution. A first mixture layer forming step (P200) of forming a mixture layer of the stock solution; A non-woven fabric layer forming step (P300) of supplying and laminating a non-woven fabric 40 on the upper surface of the first mixture layer; The secondary glass fiber chops 20 and the secondary polyurethane stock solution 30 are simultaneously sprayed on the upper surface of the nonwoven fabric layer to distribute the glass fiber chops in the polyurethane stock solution. a second mixture layer forming step (P400) of forming a mixture layer; and a release paper supply step (P500) of supplying and stacking a release paper 70 on the upper surface of the secondary mixture layer. It is characterized in that it is manufactured through.

In addition, the composite insulator for a cargo hold of an LNG carrier including a composite material layer for replacing plywood manufactured by the above method includes a primary mixture layer obtained by mixing primary glass fiber chops 20 and primary polyurethane stock solution 30. Foamed primary foam layer 100; A non-woven fabric layer in which non-woven fabric 40 is laminated on the upper surface of the primary foam layer 100 to be bonded to the secondary foam layer 200; and a secondary foam layer 200 in which a secondary mixture layer obtained by mixing secondary glass fiber chops 50 and primary polyurethane stock solution 60 is foamed on the upper surface of the nonwoven fabric 40. do.

In the above, the primary foam layer 100 is a high-density foam layer having a glass fiber content of 25 to 60% by weight and 250 to 750 kg/m ³ , and the secondary foam layer 200 has a glass fiber content of 8 to 12 % by weight, 50 to It is characterized by a low density foam layer of 150 kg/m ³ .

When the composite cold insulator for a cargo hold of an LNG carrier including a composite material layer for replacing plywood according to the present invention has the same function as the plywood when installed in the hull, the composite cold insulator is a separate Since it is not necessary to prepare plywood, it has the advantage of convenient workability and is a composite insulator in which a foam layer is formed by using a polyurethane stock solution to distribute the glass fiber chops. Therefore, the foam cells of the composite insulator are not easily separated even in the case of a sudden temperature change in the cargo hold, so the durability is excellent, and the composite insulator is not easily damaged even in the sudden temperature change in the LNG cargo hold.

In addition, the composite insulator for the cargo hold of an LNG carrier according to the present invention is composed of a non-woven fabric and a plurality of layers of glass fiber chops laminated on the upper surface of the primary foam layer, and then a secondary foam layer is formed using a secondary polyurethane stock solution. By manufacturing the cold insulator, the secondary polyurethane stock solution penetrates into the microscopic space formed in the nonwoven fabric and is bonded to the upper surface of the primary foam layer, thereby improving the adhesion between the primary foam layer and the secondary foam layer.

Therefore, the present invention is expected to increase demand as a composite cold insulating material used for the cargo hold of an LNG carrier including a composite material layer for replacing plywood in the future due to the effects described above.

1 is a view showing a typical cross-sectional structure of a cargo hold of an LNG carrier.
Figure 2 is a view showing the cross-sectional structure of a conventional heat insulating material used in the cargo hold of an LNG carrier.
3 is a view showing a process of manufacturing a composite cold insulator for a cargo hold of an LNG carrier including a composite material layer for replacing plywood according to a preferred embodiment of the present invention.
4 is a block diagram showing a process of manufacturing a composite cold insulator for a cargo hold of an LNG carrier including a composite material layer for replacing plywood by the manufacturing process shown in FIG. 3;
5 is a view showing a cross-sectional structure of a composite cold insulator for a cargo hold of an LNG carrier including a composite material layer for replacing plywood manufactured by the method of FIG. 3;
6 is a view showing a cross-sectional structure in a state in which the release paper is removed from the composite coolant for the cargo hold of the LNG carrier of FIG. 5;

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings, and in the drawings and detailed description, detailed descriptions and illustrations of elements not directly related to the technical features of the present invention are omitted, Only technical configurations related to the present invention have been briefly shown or described.

The terminology described in the specification of the present invention, 'composite insulator for cargo holds of LNG carriers' refers specifically to 'composite insulation materials for cargo holds used in 'LNG carriers, etc.', and 'LNG carriers, etc.' refers to LNG carriers. Including LNG bunker ships, LNG propulsion ships, and, broadly, LNG onshore storage can also be included.

In Figure 3 attached to the specification of the present invention, a, j are release paper supply rollers, d are nonwoven fabric supply rollers, e, f, g are compression rollers for compressing the nonwoven fabric to the foam layer, and k and l are release paper It is a compression roller that compresses the insulation material. And A and B are PUR-CPM (Polyurethane CompoPite Spray Molding) spray devices, b and h are glass fiber chop spray devices, and c and i are polyurethane stock solution supply devices. In the above, the number of rollers such as the nonwoven fabric compression roller and the release paper compression roller may be appropriately adjusted.

A method of manufacturing a composite cold insulator for a cargo hold of an LNG carrier (hereinafter referred to as 'composite coolant for a cargo hold') including a composite material layer for replacing plywood according to a preferred embodiment of the present invention is as shown in FIGS. 3 and 4. , It is characterized by going through a release paper supply step (P100), a first mixture layer forming step (P200), a nonwoven fabric layer forming step (P300), a second mixture layer forming step (P400), and a release paper supply step (P500).

Hereinafter, a method for manufacturing a composite cold insulator for a cargo hold according to a preferred embodiment of the present invention will be described in detail for each step as follows.

In the release paper supply step (P100), the release paper is transferred to the transfer conveyor (C) to form a release paper layer to prevent leakage of the primary mixture in which the primary glass fiber chops 20 and the liquid primary polyurethane stock solution 30 are mixed. As a step of supplying (10) to form a release paper layer, in this step, not only release paper but also kraft paper having release properties may be used.

The conveying conveyor (C) used in this step is preferably a device in which a plate is mounted on top of a roller of means such as a conveyor roller, but any means suitable for manufacturing polyurethane composite insulation that is foamed while being transported can be applied. there is.

In the first mixture layer forming step (P200), the first glass fiber chop 20 and the first polyurethane stock solution 30 are simultaneously sprayed on the upper surface of the release paper 10 using the PUR-CPM spray device (A) This is a step of forming a first mixture layer on the upper surface of the release paper 10 by mixing the first glass fiber chops and the first polyurethane stock solution.

Specifically, in the first mixture layer forming step (P200), when the first glass fiber chops 20 and the first polyurethane stock solution 50 are sprayed at the same time, the first glass fiber chops are mixed with the first polyurethane stock solution and evenly At this time, when the primary polyurethane stock solution 30 is foamed, the interval between the glass fiber chops 20 widens according to the foaming ratio, and the glass fiber chops 20 inside the primary foam layer 100 This is a step of forming a first mixture layer so that the mixture is uniformly distributed.

The primary mixture layer is foamed while moving along the moving direction of the transfer conveyor (C) to form the primary foam layer 100 as shown in FIGS. 5 and 6 .

Since the primary foam layer 100 has the same function as plywood for fixing the composite coolant for cargo hold when installed in the hull, there is no need to prepare a separate plywood when installing the composite coolant for cargo hold in the hull. It has the advantage of ease of construction.

Therefore, since the primary foam layer 100 is a foam layer used as a substitute for plywood, it is a foam layer requiring excellent durability and mechanical properties, and the glass fiber content is 25 to 60% by weight and 250 to 750 kg/m ³ It is preferable that it is a high-density foam layer.

When the glass fiber content and density of the primary foam layer 100 are less than the ranges defined above, durability and mechanical properties may be deteriorated, and when they exceed the ranges defined above, polyurethane As the glass fiber content mixed in the stock solution exceeds the range of the proper mixing amount, the primary foam layer 100 is not formed properly, so there is a concern that it is unsuitable for use as a substitute for plywood.

In the present invention, the polyurethane stock solution (30, 60) means a mixture of polyol and isocyanate, which are polyurethane raw materials.

The mixture of polyol and isocyanate used in the present invention is a mixture used in general polyurethane synthesis, and is preferably selected from polyester polyol and polyether polyol, and the isocyanate compound is toluene diisocyanate, hexamethylene diisocyanate It is preferable to use isocyanate, isophorone diisocyanate, or diphenylmethane diisocyanate alone or in combination of two or more.

Therefore, in the first mixture layer forming step (P200) and the second mixture layer forming step (P400), when the glass fiber chop and the polyurethane stock solution are simultaneously sprayed by the PUR-CPM spray device, the glass fiber chop is mixed with the polyurethane stock solution As polyurethane is foamed by the reaction of a mixture of polyol, which is a polyurethane stock solution, and isocyanate, the gap between the glass fiber chops widens according to the foaming ratio, and the glass fiber chops are uniformly distributed inside the foam layer, forming a foam layer. .

The non-woven fabric layer forming step (P300) is a step of supplying and laminating the non-woven fabric 40 on the upper surface of the primary mixture layer, and the non-woven fabric 40 supplied in this step is a primary polyurethane between the micropores formed in the non-woven fabric. As the stock solution 30 and the secondary polyurethane stock solution 60 permeate and foam, the primary foam layer 100 and the secondary foam layer 200 are integrally bonded.

Specifically, in this step, the nonwoven fabric 40 is laminated on the upper surface of the primary foam layer 100, and then the secondary glass fiber chop 50 and the secondary polyurethane stock solution 60 are mixed in a subsequent step (P400) When the secondary foam layer 200 as shown in FIG. 3 is formed when the secondary mixture layer is foamed while moving along the moving direction of the conveyor C, the secondary polyurethane stock solution 60 is applied to the nonwoven fabric 40 By infiltrating into the microscopic space formed in and bonding to the upper surface of the primary foam layer 100, the adhesive force between the primary foam layer 100 and the secondary foam layer 200 is improved in a subsequent step, thereby improving the primary foam layer 100. ) and the secondary foam layer 200 are integrally combined.

In the second mixture layer forming step (P400), the second glass fiber chop 50 and the second polyurethane stock solution 60 are applied to the upper surface of the nonwoven fabric 40 at the same time using the PUR-CPM spray device (B). This is a step in which the mixture of the secondary glass fiber chops and the secondary polyurethane stock solution is sprayed to form a secondary mixture layer on the upper surface of the nonwoven fabric 40.

The secondary mixture layer is foamed while moving along the moving direction of the transfer conveyor (C) to form a secondary foam layer 200 as shown in FIGS. 5 and 6 .

The secondary foam layer 200 is a low-density foam layer compared to the primary foam layer 100, and reduces the weight of the composite coolant for the cargo hold, has excellent insulation performance even in the case of rapid temperature changes in the cargo hold, and makes it easy for the foamed cells of the composite coolant to form. It is a foam layer with excellent durability by preventing breakage so as not to separate.

Therefore, the secondary foam layer 200 is a foam layer for insulation of the cargo hold, and has a glass fiber content of 8 to 12% by weight and 50 to 12% by weight. It is preferably a low density foam layer of 150 kg/m ³ .

When the glass fiber content and density of the secondary foam layer 200 are less than the above-limited ranges, there is a concern that the insulation performance of the cargo hold may deteriorate, and when the glass fiber content and density exceed the above-limited ranges, the polyurethane stock solution As the mixed glass fiber content is excessively mixed than the appropriate mixing amount, the weight of the secondary foam layer 200 may increase.

The release paper supply step (P500) is a step of supplying and stacking the release paper 70 on the upper surface of the secondary mixture layer, in which the secondary mixture layer is foamed while moving along the moving direction of the transfer conveyor (C). In order to protect the foam layer 200, the release paper 70 is supplied to the upper surface of the secondary foam layer 200 and laminated.

Hereinafter, a composite cold insulator for a cargo hold manufactured by the manufacturing method of a composite cold insulator for a cargo hold of an LNG carrier including a composite material layer for replacing plywood according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 5 and 6 Same as below

The composite coolant P for a cargo hold according to a preferred embodiment of the present invention has a structure as shown in FIGS. 5 and 6, and includes a mixture of primary glass fiber chops 20 and primary polyurethane stock solution 30. A primary foam layer 100 in which the secondary mixture layer is foamed; A non-woven fabric layer in which non-woven fabric 40 is laminated on the upper surface of the primary foam layer 100 to be bonded to the secondary foam layer 200; And a secondary foam layer 200 in which a secondary mixture layer obtained by mixing secondary glass fiber chops 50 and primary polyurethane stock solution 60 is foamed on the upper surface of the nonwoven fabric 40; Characterized in that it is a foam layer.

The primary foam layer 100 is a foam layer used as a substitute for plywood, and the secondary foam layer 200 is a foam layer for insulation of a cargo hold. The primary foam layer 100 and the secondary foam layer 200 ) has been described in detail in the description of the manufacturing method of the composite insulator for cargo holds, so the description thereof will be omitted here.

In the composite insulator (P) for cargo holds having the structure described above, the glass fiber chops 20 serve as a bridge connecting the foam cells of the insulator, so the foam cells of the composite insulator are easily separated even in the rapid temperature change of the LNG cargo hold. Therefore, the durability is excellent, and the composite insulator is not easily damaged even in the sudden temperature change of the LNG cargo hold.

In addition, when the composite cold insulator for a cargo hold (P) of the present invention is manufactured by the manufacturing method as shown in FIGS. 5 and 6, the outer surface of the foam layer of the composite coolant for a cargo hold, that is, the upper surface of the foam layer. And the release papers 10 and 70 are stacked on the lower surface, respectively, but when using a composite cold insulator for a cargo hold, the release papers 10 and 70 must be removed before use. It does not necessarily have to be included in the right.

For reference, in the present invention, the thickness of the primary foam layer 100, the secondary foam layer 200, and the nonwoven fabric 40 is not particularly limited, and may be appropriately adjusted according to the needs of the consumer or the manufacturer. .

The length of the glass fiber chop is preferably 10 to 30 mm, but is not necessarily limited to the specific range above, and may be appropriately adjusted according to the needs of the consumer or the manufacturer.

As described above, the composite cold insulating material for a cargo hold of an LNG carrier including a composite material layer for replacing plywood according to a preferred embodiment of the present invention and a method for manufacturing the same are shown in accordance with the above description and drawings, but this is only an example. And those skilled in the art will understand that various changes and modifications are possible within the scope of the technical spirit of the present invention.

10, 70: release paper
20, 50: glass fiber chop
30, 60: polyurethane stock solution
40: non-woven fabric
A, B: PUR-CPM spray device
C: transfer conveyor
P: Composite insulation for cargo holds of LNG carriers
100: primary polyurethane foam layer
200: secondary polyurethane foam layer

Claims (5)

A release paper supply step (P100) of supplying the release paper 10 to the transfer conveyor (C);
The primary glass fiber chops 20 and the primary polyurethane stock solution 30 are simultaneously sprayed on the upper surface of the release paper 10 so that the glass fiber chops are distributed in the polyurethane stock solution. A first mixture layer forming step (P200) of forming a mixture layer of the stock solution;
A non-woven fabric layer forming step (P300) of supplying and laminating a non-woven fabric 40 on the upper surface of the first mixture layer;
The secondary glass fiber chops 20 and the secondary polyurethane stock solution 30 are simultaneously sprayed on the upper surface of the nonwoven fabric layer to distribute the glass fiber chops in the polyurethane stock solution. a second mixture layer forming step (P400) of forming a mixture layer; and
A release paper supply step (P500) of supplying and stacking a release paper 70 on the upper surface of the secondary mixture layer; including,
The first mixture layer and the second mixture layer are foamed while moving along the moving direction of the conveyor (C), and the glass fiber content is 25 to 60% by weight, and the density is 250 to 750 kg / m ³ High-density foam layer 1 A composite for a cargo hold of an LNG carrier, including a composite material layer for replacing plywood, characterized in that a primary foam layer 100 and a secondary foam layer 200, which is a low-density foam layer having a density of 50 to 150 kg/m ³ , are formed, respectively. Manufacturing method of cold insulation material
delete delete delete A composite cold insulator for a cargo hold of an LNG carrier manufactured by the method of claim 1,
The first mixture layer in which the primary glass fiber chops 20 and the primary polyurethane stock solution 30 are mixed has a glass fiber content of 25 to 60% by weight and a density of 250 to 750 kg/m ³ It is a high-density foam layer. Foamed primary foam layer 100;
A non-woven fabric layer in which non-woven fabric 40 is laminated on the upper surface of the primary foam layer 100 to be bonded to the secondary foam layer 200; and
A second mixture layer obtained by mixing the secondary glass fiber chops 50 and the primary polyurethane stock solution 60 on the upper surface of the nonwoven fabric 40 has a glass fiber content of 8 to 12% by weight and a density of 50 to 150 A secondary foam layer 200 foamed with a low density foam layer of kg/m ³ ;
A composite cold insulator for a cargo hold of an LNG carrier including a composite material layer for replacing plywood, characterized in that consisting of.

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