JP6605824B2 - Heat insulation member, method for producing heat insulation member - Google Patents

Description

  The present invention relates to a heat insulating member having excellent heat insulating performance.

  Thermal insulation members are used in various fields such as automobiles, home appliances, and buildings. For example, there is a vacuum heat insulating member whose inside is evacuated. Since a vacuum heat insulation member can suppress heat conduction via gas, such as air, it has high heat insulation performance.

  As such a vacuum heat insulating member, for example, a plurality of core materials arranged at predetermined intervals are sealed under reduced pressure with a jacket material having a gas barrier property, and each of the plurality of core materials is arranged in an independent space. In addition, there is a vacuum heat insulating material having a non-core material portion consisting only of a jacket material between adjacent core materials (Patent Document 1).

  Moreover, there exists a vacuum heat insulating material which has a panel-shaped vacuum heat insulating material main body and the overhang | projection piece which protrudes to the side from the periphery of a vacuum heat insulating material main body (patent document 2).

JP 2007-155085 A JP 2013-164147 A

  Such a vacuum heat insulating material may be fixed to a wall surface of a structure by nailing or the like, for example. However, when nailing the vacuum heat insulating material, the internal vacuum cannot be maintained, and the function as the vacuum heat insulating material cannot be exhibited.

  On the other hand, since the non-core material part in Patent Document 1 and the overhanging piece in Patent Document 2 do not have a core material inside, if a nail or the like is driven into this part, the internal vacuum degree can be maintained. Is possible.

  However, in Patent Document 1 and Patent Document 2, since nailing can be performed only on a predetermined portion, nailing cannot be performed at an arbitrary place, and construction is limited. In addition, if a nail is hit by mistake on the core, air enters and the vacuum is lost, so the heat insulation performance is significantly reduced. Further, since the non-core material portion and the overhanging piece are not the vacuum heat insulating portion, the heat insulating performance is remarkably deteriorated in this portion, and as a result, the heat insulating performance as the whole heat insulating material is deteriorated.

  This invention is made | formed in view of such a problem, and it aims at providing the heat insulation member etc. which are excellent in construction workability | operativity, and are excellent in heat insulation performance.

In order to achieve the above-mentioned object, the first invention is a molded body comprising a plurality of resin foam particles, wherein the resin foam particles have a large number of bubbles, and the inside of the bubbles is decompressed, A gas barrier film is formed on the outer periphery of the resin foam particles, a resin layer is further formed on the outer periphery of the gas barrier film, and the resin foam particles are integrated with an adhesive member. It is another resin foam particle in which a film is not formed, and the resin foam particle and the other resin foam particle are in contact with each other in a particulate form .

  The plurality of resin foam particles are desirably integrated with an adhesive member.

  The adhesive member may be a resin.

  The adhesive member may be another resin foam particle in which a gas barrier film is not formed.

  The gas barrier film is preferably a metal film.

  The bubbles are preferably closed cells.

  According to the first invention, the resin foam particles have a plurality of resin foam particles, and the outer peripheral surface of the resin foam particles is covered with the gas barrier film in a state where the internal bubbles are decompressed. Insulates heat. For this reason, even if a nail is struck on a part of the molded body, the heat insulation performance of the resin foam particles whose gas barrier film is damaged by the nail is only deteriorated, and other resin foam particles maintain the heat insulation performance. As a whole, a decrease in the heat insulation effect can be minimized. Therefore, since nailing can be performed at an arbitrary site, workability is excellent. Further, since the resin foam particles are particles exhibiting a heat insulating function, the shape of the molded body is not limited, and the degree of freedom of processing after molding is high. Furthermore, since there is no non-core material part or overhanging piece, the heat insulation performance is not partially deteriorated. Therefore, heat insulation performance becomes uniform over the whole heat insulating material, and as a result, high heat insulation performance can be exhibited.

  In the conventional resin foam, bubbles are formed by the expansion of the gas by heating. Therefore, it is considered that the inside of the bubbles is close to normal pressure at room temperature. By performing the reduced pressure treatment, the heat insulation efficiency is improved as compared with the conventional case, and the reduced pressure state is maintained by the gas barrier film.

  Moreover, since the resin foam particles are integrated by the adhesive member, the resin foam particles can be easily integrated and formed into an arbitrary shape.

  If the adhesive member is a resin, for example, the heat insulating member can be formed by injection molding or the like by mixing resin foam particles in an injection molding resin material.

  Moreover, if the adhesive member is a resin foam particle in which a gas barrier film is not formed, the adhesive member itself can also exert a heat insulating effect due to bubbles.

  If the gas barrier film is a metal film, the gas barrier film can be formed by, for example, vacuum deposition, plating, sputtering, or the like.

  In addition, if the bubbles are closed bubbles, it is possible to prevent air from entering the bubbles before the gas barrier film is formed after the pressure in the bubbles is reduced.

The second invention includes a step of foaming resin particles to form resin foam particles, a step of heating the resin foam particles under reduced pressure, a step of providing a gas barrier film on the outer periphery of the resin foam particles, comprising a step of integrating the resin foamed particles in the adhesive member, wherein the gas barrier film is a metal film, wherein after providing the gas barrier film, have a step of further forming a resin layer on the outer periphery of the gas barrier film , the adhesive member is another resin foamed particles not gas barrier film formed, the resin foamed particles and the other resin foamed particles in the manufacturing method of the heat insulating member, characterized that you have contact with each other in particulate form is there.

  The gas barrier film is a metal film, and after the gas barrier film is provided, a step of further forming a resin layer on the outer periphery of the gas barrier film may be provided.

  According to the second invention, by heating the resin foam particles under reduced pressure, the inside of the bubbles can be decompressed, and the heat insulation performance can be maintained for each resin foam particle by the gas barrier film.

  Also, when the gas barrier film is a metal film, after providing the gas barrier film, by further applying a resin film on the outer periphery of the gas barrier film, the resin foam particles can be more easily integrated by fusion or the like. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, the heat insulation member etc. which are excellent in construction workability | operativity and excellent in heat insulation performance can be provided.

(A) is sectional drawing which shows the heat insulation member 1, (b) is an expansion conceptual diagram of the heat insulation member 1, (c) is a conceptual diagram which shows the independent bubble 9. FIG. (A) is the conceptual diagram which shows the state which put the resin particle 13 in the container 11, (b) is the conceptual diagram which shows the state which made the resin particle foam, (c) is the resin expanded particle 3 in a heating furnace. The conceptual diagram which shows the state which has arrange | positioned, (d) is a conceptual diagram which shows the state which forms the gas barrier membrane | film | coat 5 in the resin foaming particle 3. FIG. (A) is sectional drawing which shows the heat insulation member 1a, (b) is an expansion conceptual diagram of the heat insulation member 1a. Sectional drawing which shows the resin foaming particle 3 which has the resin layer 17. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig.1 (a) is sectional drawing which shows the heat insulation member 1, FIG.1 (b) is the A section enlarged conceptual diagram of Fig.1 (a). The heat insulating member 1 is a molded body in which a plurality of resin foam particles 3 are assembled and integrated.

  A gas barrier film 5 is formed on the outer peripheral surface of each resin foam particle 3. Moreover, the resin foam particles 3 are integrated by the resin 7. That is, the resin 7 functions as an adhesive member for bonding the resin foam particles 3 to each other.

  The gas barrier film 5 may be made of any material as long as it can shield the gas, but is, for example, a silica film or a metal film. Further, the thickness of the gas barrier coating 5 may have a gas barrier performance, and may be, for example, about 20 μm.

  FIG. 1C is an enlarged view of part B of FIG. 1B and is a conceptual diagram showing closed cells 9. A large number of minute closed cells 9 are formed inside the resin foam particles 3. In the present invention, the inside of the closed cell 9 is depressurized. In the following description, an example in which the bubbles of the resin foam particles 3 are closed cells 9 will be described. However, the bubbles inside the resin foam particles 3 may not necessarily be closed cells.

  In addition, although the material of the resin expanded particle 3 is not ask | required, a polypropylene, a polystyrene, a polyethylene terephthalate, a polycarbonate etc. are applicable, for example. Polyethylene terephthalate and polycarbonate can be used at a higher temperature than polypropylene and polystyrene.

  Next, the manufacturing method of the heat insulation member 1 is demonstrated. First, as shown in FIG. 2A, the resin particles 13 are put in the container 11. The resin particles 13 are preliminarily infiltrated with gas. In this state, the resin particles 13 are foamed by heating to a predetermined temperature. Although the heating temperature depends on the material, for example, in the case of polyethylene terephthalate, it is heated to about 140 ° C to 170 ° C. By heating, the resin particles 13 are expanded, and the resin expanded particles 3 are formed. The resin foam particles 3 have a diameter of about 2 to 10 mm. Here, the diameter of the resin foam particles 3 is an average of the maximum value and the minimum value of the outer diameters of arbitrary particles.

  At this time, by keeping the container 11 sufficiently larger than the total volume of the foamed resin foam particles 3, the resin foam particles 3 are not molded into a container shape, and the individual resin foam particles 3 are formed. It can be taken out.

  Next, the obtained resin foam particles 3 are taken out from the container 11 and placed in a heating furnace. The inside of the heating furnace can be decompressed by the decompression device 15. By reducing the pressure inside the heating furnace in the heated state, the inside of the closed cells inside the resin foam particles 3 can be reduced.

  The heating temperature is a temperature lower than the softening temperature of the material and is, for example, about 60 to 70 ° C. If the temperature is too low, the degassing of the closed cells cannot be performed. If the temperature is too high, the constituent resin may be softened and the resin foam particles 3 may be crushed. The degree of vacuum is, for example, about 0.5 Pa (or normal pressure—about 100 kPa). The heating and decompression time is about 24 hours.

  Next, as shown in FIG. 2 (d), the resin foam particles 3 are arranged in a vacuum vapor deposition device 16, and the gas barrier film 5 is formed on the outer peripheral surface of the resin foam particles 3 by vacuum vapor deposition.

  Here, if the state in which the resin foam particles 3 are returned to room temperature and normal pressure is maintained for a long time, air enters into the decompressed closed cells. Therefore, after the resin foam particles 3 are returned to room temperature and normal pressure, a vacuum deposition apparatus is used. It is desirable to perform the work arranged in 16 in as short a time as possible. Preferably, it is desirable to carry out heating depressurization and vacuum deposition continuously in the same furnace. Note that if the resin foam particles 3 are made of polyethylene terephthalate, the nitrogen permeability is extremely low, so that the infiltration of air into the closed cells can be suppressed. The gas barrier film 5 may be formed by a method other than vacuum deposition.

  As described above, the resin foam particles 3 having the gas barrier coating 5 can be produced. The obtained resin foam particles 3 are integrated with an adhesive member to form a molded body. For example, the heat-insulating member 1 having an arbitrary shape including a plurality of resin foam particles 3 can be obtained by mixing the resin foam particles 3 with an injection molding resin and performing injection molding on an injection mold. For example, a box-shaped heat insulating member 1 can be used.

  In addition, you may provide an exterior in the outer periphery of the heat insulation member 1. FIG. The exterior may be a gas barrier material, for example, metal. The exterior may be a flexible material such as a laminated film of metal and resin, or may be a rigid material such as a metal plate. The interior of the exterior may be depressurized or normal pressure.

  In addition, when polyethylene terephthalate is selected as the material of the resin foam particles 3, the expansion ratio of the resin foam particles 3 is desirably 20 to 100 times. When the expansion ratio is less than 20%, sufficient heat insulating properties cannot be obtained, and when the expansion ratio exceeds 100 times, the productivity is deteriorated and it is difficult to maintain the strength of the resin expanded particles 3. is there. In addition, in the case of a resin foam particle having an expansion ratio of 20 to 100 times using polyethylene terephthalate, the 10% compressive stress at room temperature is 10 kPa or more, and a good shape can be maintained even if the resin foam particle 3 is decompressed. it can.

  As described above, according to the present embodiment, the air bubbles inside the resin foam particles 3 are in a decompressed state, so that the heat insulation characteristics are improved even when compared with the case of using a conventional resin foam. It is good. In addition, since the resin foam particles 3 are formed with the gas barrier film 5 independently of each other, even if a hole is formed in a part of the heat insulating member 1 by nailing or the like, for example, only a part of the resin foam particles 3 is formed. The decrease in the heat insulating performance of the heat insulating member 1 as a whole can be suppressed to a minimum only by the internal bubbles becoming normal pressure.

  Further, since the resin foam particles 3 are integrated with the resin 7 which is an adhesive member, the resin foam particles 3 can be formed into an arbitrary shape.

  Moreover, since the gas barrier film 5 is formed by vacuum deposition, when the gas barrier film 5 is formed, air can be prevented from entering the bubbles in the resin foam particles 3.

  Further, if the bubbles of the resin foam particles 3 are closed cells, the decompression in the bubbles can be more reliably maintained.

  Next, a second embodiment will be described. Fig.3 (a) is sectional drawing which shows the heat insulation member 1a, FIG.3 (b) is the C section expansion conceptual diagram of Fig.3 (a). In addition, in the following description, about the structure which show | plays the function similar to the heat insulation member 1, the code | symbol same as FIG. 1 etc. is attached | subjected and the overlapping description is abbreviate | omitted.

  Although the heat insulation member 1a is the structure substantially the same as the heat insulation member 1, the adhesion methods of the resin foam particles 3 differ. In the heat insulating member 1 a, the resin foam particles 3 are integrated by other resin foam particles 3 a that do not have the gas barrier coating 5. That is, the heat insulating member 1 a is composed of the resin foam particles 3 a and the resin foam particles 3.

  The heat insulating member 1a is formed as follows, for example. By the method described above, the resin foam particles on which the gas barrier film 5 is formed and the unfoamed resin particles are sealed in a mold, and the resin particles are foamed. The foamed resin foam particles 3a and the resin foam particles 3 are integrated into the cavity shape of the mold. In this way, an arbitrary three-dimensional heat insulating member 1a can be formed.

  In order to increase the adhesive force between the resin foam particles 3a and the resin foam particles 3, as shown in FIG. 4, a resin layer is further formed on the outer peripheral surface of the gas barrier film 5 of the resin foam particles 3 before being inserted into the mold. 17 may be formed. The resin layer 17 can be formed by a known coating method such as painting.

  Thus, by covering the outermost peripheral surface with the resin layer 17, it can be more reliably integrated with the outer peripheral surface of the resin foamed particles 3a by fusion or the like. The resin constituting the resin layer 17 is preferably a material that is softened at the heating temperature of the foaming step for foaming the resin particles and can be fused.

  According to the second embodiment, an effect similar to that of the first embodiment can be obtained. Moreover, the heat insulation effect by the resin foaming particle 3a can also be acquired because the resin foaming particle 3 is integrated with the other resin foaming particle 3a.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1, 1a ......... Heat insulation member 3, 3a ......... Resin foam particle 5 ......... Gas barrier film 7 ......... Resin 9 ......... Closed cell 11 ......... Vessel 13 ......... Resin particle 15 ......... Pressure reduction Device 16 ... Vacuum evaporation device 17 ... Resin layer

Claims (4)

A molded body comprising a plurality of resin foam particles,
The resin foam particles have many bubbles,
The inside of the bubble is depressurized,
A gas barrier film is formed on the periphery of the resin foam particles.
A resin layer is further formed on the outer periphery of the gas barrier film,
The resin foam particles are integrated with an adhesive member ,
The adhesive member is another resin foam particle on which a gas barrier film is not formed,
The heat insulating member, wherein the resin foam particles and the other resin foam particles are in contact with each other in a particulate form .   The heat insulating member according to claim 1, wherein the gas barrier film is a metal film. The bubbles, the heat insulating member to claim 1 or claim 2 characterized in that it is a closed cell. A step of foaming the resin particles to form the resin foam particles;
Heating the resin foam particles under reduced pressure;
Providing a gas barrier film on the outer periphery of the resin foam particles;
Integrating the resin foam particles with an adhesive member;
Comprising
The gas barrier coating is a metal layer, wherein after forming the gas barrier film, have a step of forming a further resin layer on the outer periphery of the gas barrier film,
The adhesive member is another resin foam particle on which a gas barrier film is not formed,
The resin foamed particles and the other resin expanded particles production method of the heat insulating member, characterized that you have contact with each other in the particulate form.

Images