JPH02120598A - Insulating body - Google Patents

Abstract

PURPOSE:To make exhaust air loss extinct, shorten air releasing time, and improve productivity by disposing core foam of minute foaming skeleton and space foam of coarse foaming skeleton in a sealed container with an air releasing valve. CONSTITUTION:Spacer foam 9 made of hard urethane foam obtained by mixing 5.0-8.0 weight parts of bivalent metallic salt of powder unsaturated monocarboxylic acid into 100 weight parts of polyol and foaming this mixture as a bubble communicating agent is disposed at the inner surface of a sealed container 7 with an air releasing valve 8 as an air releasing passage, and further inside, core foam 10 made of hard urethane foam obtained by mixing 0.1-5.0weight parts of bivalent metallic salt of powder saturated monocarboxylic acid into 100weight parts of polyol and foaming this mixture as a bubble communicating agent is disposed, and after being sealed, released through the air releasing valve so as to obtain an insulating body 1. As a result, extra exhaust air other than that in the insulating body is extinct, air releasing time is shortened, and productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat insulator for use in refrigerators, freezers, frozen prefabricated products, and the like.

BACKGROUND OF THE INVENTION In recent years, attention has been paid to the use of heat insulating bodies with reduced internal pressure for the purpose of improving the heat insulating performance of heat insulating boxes.

The core material of this insulator is powder made of perlite,
Honeycomb and foam are used. ff1. For example, as shown in Japanese Unexamined Patent Publication No. 63-34479, a proposal has been made to use a hard urethane foam having an open cell structure as the core material. To explain this Japanese Unexamined Patent Application Publication No. 83-34479 with reference to FIGS. 5 and 6, in the figure 1 is a heat insulator, and a rigid polyurethane foam 2 having open cells is placed in a container 3 made of an airtight thin film. After that, it is placed in the reduced pressure chamber 6 of the vacuum packaging machine 4, and the inside of the open air bubbles of the hard urethane foam 2 and between the container 3 and the hard urethane foam 2 are used as exhaust passages 7, and the air is evacuated from the opening 6 and sealed. There is.

Problem 1 to be Solved by the Invention However, in the above configuration, the vacuum packaging machine 4 is required as an evacuation device, and regardless of the size of the heat insulator 1, the inside of the decompression chamber 6 can be raised to a predetermined pressure. I had to depressurize. Furthermore, even when manufacturing a heat insulating body 1 with a small size, it not only takes the same evacuation time as when evacuating a heat insulating body 1 with a large size, but also when manufacturing a heat insulating body 1 with a large size that cannot be accommodated in the decompression chamber 5. There was a problem in that the heat insulating body 1 bent into an L-shape or the like could not be manufactured. Furthermore, when the inside of the heat insulator is evacuated using the decompression chamber 6, the space between the hard urethane foam 2 and the container 3 is used as an exhaust passage, so there is no problem even if the opening 6 has a shape that does not have a sufficient opening area. When directly exhausting the inside of the heat insulator, it is not possible to secure a sufficient exhaust passage between the hard urethane foam 2 and the container 3, so the exhaust resistance is large and it takes a long time to reach the predetermined pressure. The problem was to reduce the pressure inside the heat insulator 1 to a predetermined pressure in a short time without using the vacuum chamber.

In order to solve the above problems, the present invention provides an exhaust passage with low exhaust resistance and performs direct exhaust, thereby eliminating exhaust loss, shortening exhaust time, and improving productivity. The purpose is to make it possible to manufacture a hollow-shaped heat insulator.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides 0.1 to 6.0 parts by weight of a divalent metal of powdered saturated monocarboxylic acid per 10 parts by weight of polyol as a cell communication agent. A core material foam consisting of a hard urethane foam with an open cell structure mixed with salt and foamed, and 5.0 to 8.0 parts by weight of powdered saturated monocarboxylic acid per 100 parts by weight of polyol as a cell communication agent. A spacer foam made of hard urethane foam with an open cell structure that is foamed with a mixture of valent metal salts;
It uses a closed container with an exhaust valve.

Operation With the above configuration, the core material foam and the spacer form have a substantially 100% open cell structure, and the core material foam has a fine cell skeleton and the spacer form has a coarse cell skeleton. By arranging such a core material foam and a spacer form inside a sealed container that has an exhaust valve, the air inside the core material foam is transferred to the spacer form with low exhaust resistance, which is arranged in contact with the inner surface of the sealed container. In addition, by not using a decompression chamber, there is no need for extra exhaust outside of the inside of the insulator, which shortens the exhaust time, which not only greatly contributes to productivity, but also This also makes it possible to manufacture large insulators that cannot be stored in a vacuum chamber.

Note that since the spacer foam is made of urethane resin with a low solid thermal conductivity, even if the bubble diameter is coarse, the effect on the deterioration of the insulation performance is small and a heat insulator with excellent insulation properties can be obtained.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 shows a heat insulator 1 in this embodiment. In FIG. 1, 7 is a closed container having an exhaust valve 8, and as shown in FIG. 2, a spacer foam 9 made of a hard urethane foam having an open cell structure is foamed on the inner surface in advance. The spacer foam 9 was foamed in a urethane high-pressure foaming machine using the raw materials and blended parts shown in Table 1, cured, and then cut into a predetermined shape.

Table 1 In Table 1, the polyol is a polyether polyol with a hydroxyl value of 442 mgKOH/y obtained by addition polymerizing propylene oxide using an aromatic diamine as an initiator. The foam stabilizer is Shin-Etsu Chemical's Nuricorn surfactant F-317, and the foaming agent is Showa Denko's Kiflon R-11.
It is. The catalyst was dimethylethanolamine, and the bubble communication agent was Nippon Oil & Fats Corporation's calcium stearate. The organic polyisocyanate is a prepolymer polyisocyanate with an amine equivalent weight of 160. The density of the rigid urethane foam with open cell structure foamed with these raw materials is 30-
35 Kl/7n', the open cell ratio was 100%, and the cell diameter was 400 to 600 μm.

Thereafter, a core material foam 10 made of a hard urethane foam having an open cell structure was foamed inside the obtained sealed container 7 (FIG. 3). The core material foam 10 was foamed and cured in a urethane high-pressure foaming machine using the raw materials and blended parts shown in Table 2. .

In Table 2, the polyol is a polyether polyol with a hydroxyl value of 442 mgKOH/y obtained by addition polymerizing propylene oxide using an aromatic diamine as an initiator. The foam stabilizer is silicone surfactant F-335 manufactured by Shin-Etsu Chemical ■. The foaming agent is Freon R-11 manufactured by Showa E-Ko.
It is. The catalyst was dimethylethanolamine, and the bubble communication agent was calcium stearate manufactured by NOF ■.

The organic polyisocyanate is a prepolymer polyinocyanate with an amine equivalent of 150.3 The rigid urethane foam foamed with these raw materials has a density of 1d and 40 to 46 y/n? The open cell ratio was 100%, and the average cell diameter was 80/jm.

After that, the opening 11 of the airtight container 7 is heat-sealed and the inside is evacuated from the exhaust valve 8 using a vacuum pump (Fig. 4).
The pressure was reduced to 5yHy to obtain the heat insulator 1.

As Comparative Example 1, after foaming the smooth foam 9 and the core foam 10 inside the closed container 7, the opening 11
The heat insulator 1 obtained by evacuating with a vacuum packaging machine 4 is also
As Comparative Example 2, only the core foam 10 was foamed inside the closed container 7, the opening 11 was sealed, and then the air was evacuated through the exhaust valve 8, thereby producing the resulting heat insulators 1, respectively.

The thermal conductivity of each of the obtained heat insulators 1 is 0.0055.
~o, oeoom/mhr°C, but in the evacuation time, the pressure could be reduced to the predetermined internal pressure in 50 to 60 seconds in this example, whereas in Comparative Example 1, An evacuation time of 1 minute 30 seconds to 2 minutes was required. In addition, in Comparative Example 2, exhaust resistance was large because exhaust was performed only through the communication hole inside the hard urethane foam that was the core material foam, and the 3° method required approximately 30 minutes of exhaust time. In a closed container 7 having an exhaust valve 8, a spacer form 9 with a coarse cell diameter and a core material form 1 with a fine cell diameter are made of a hard urethane foam with an open cell structure.
By foaming and sealing the foam and then exhausting the air inside through the exhaust valve 8 to obtain the heat insulator 1, the decompression chamber 6 becomes unnecessary, the exhaust time can be shortened, and this greatly contributes to productivity. It has also made it possible to manufacture large insulators that cannot be accommodated in a vacuum chamber.

Effects of the invention As described above, 5.
A spacer made of a hard urethane foam foamed by mixing 0 to 8.0 parts by weight of a divalent metal salt of a powdered saturated monocarboxylic acid is provided as an exhaust passage with a diameter of 7 ohm, and polyol is placed inside the spacer as a cell communication agent. 0.0% per 100 parts by weight.
A core material foam made of a hard urethane foam foamed by mixing 1 to 5.0 parts by weight of a powdered saturated monocarboxylic acid divalent metal salt is placed and sealed, and then exhausted from an exhaust valve.
By obtaining a heat insulator, the core foam and spacer foam have a 100-cell open cell structure, and the air inside the core foam is evacuated through the spacer foam with low exhaust resistance, which is placed in contact with the inner surface of the sealed container. 4. Can be quickly degassed. By not using a decompression chamber, there is no need for extra evacuation outside of the inside of the insulator, which shortens the evacuation time, which not only greatly contributes to productivity, but also reduces pressure. This makes it possible to manufacture large insulators that cannot be stored inside the chamber.

Note that since the spacer foam is made of urethane resin with a low solid thermal conductivity, even if the bubble diameter is coarse, the effect on the deterioration of the insulation performance is small and a heat insulator with excellent insulation properties can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a heat insulating body according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the container, exhaust valve, and spacer form, and Figs. 3 and 4 are cross sections showing the manufacturing process of the heat insulating body. FIG. 6 is a cross-sectional view of a conventional heat insulating body, and FIG. 6 is a cross-sectional view showing the state of an evacuation process in a vacuum packaging machine. 1...Insulator, End...Airtight container, 8...
・・・Exhaust valve, 9 ・-Spacer form, 10
... Core material form. Name of agent: Patent attorney Shigetaka Awano and 1 other person ± 2 Katamachi 4. 71F Qi Help 7, Go to Surf-O+! 0 / Figure 2 Closed ZX? ! ! -Ki Half Spacer Form, 'sun Buohm? hot wall

Claims (1)

[Claims] It is composed of a core foam, a spacer foam, and a closed container having an exhaust valve, and the inside is depressurized, and the core foam contains polyol 10 as a cell communication agent.
The spacer foam is a rigid urethane foam with an open-cell structure that is foamed by mixing 0.1 to 5.0 parts by weight of a divalent metal salt of a powdered saturated monocarboxylic acid to For 100 parts by weight of polyol,
A heat insulator that is a rigid urethane foam with an open cell structure that is foamed by mixing 5.0 to 8.0 parts by weight of a divalent metal salt of a powdered saturated monocarboxylic acid.