JPH0553937U - Cooling material - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a cold insulating material which is easily attached to a convex or concave surface, has an excellent cold insulating effect, and is hard to be scratched. [Structure] A structure in which a cloth or leather (2) is attached to the surface of a flexible polymer foam (1) having a density in the range of 0.01 to 0.4 g / cm ^3. .

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a cold insulating material which is excellent in workability, has a good cold insulating effect, and is not easily scratched on the surface.

[0002]

[Prior Art]

 A large number of cold insulators are used to improve processes, lives, work environments of various industries, and reduce energy consumption. In order to meet such requirements, it is necessary to make appropriate selections from the material and structural viewpoints. From this point of view, porous cold insulators, air layer cold insulators, fibrous cold insulators are used. In recent years, porous plastic coolers have been used that are easy to manufacture, inexpensive, and easy to install. Most of them are polystyrene foam, urea foam and phenol foam.

[0003]

[Problems to be solved by the device]

 However, since the above-mentioned various cold insulating materials are poor in flexibility, if the surface of the object requiring cooling is a flat plate with a wide surface, it does not feel much difficulty in the construction process such as sticking, but the surface to be stuck If the surface was concave or convex, it was difficult to attach it, the workability was poor, and the desired cold insulation effect was not sufficient, and frost adhered. In addition, since the cold insulating material is exposed as it is on the outer surface, it has a defect that it may be damaged by contact with other objects during long-term use.

[0004]

[Means for Solving the Problems]

 As shown in the partial cross-sectional view of FIG. 1, the present invention is based on a cold insulating material in which a cloth or leather (2) is attached to the surface of a flexible polymer porous body (1). is there . In addition, (3) in the figure represents an object to which the cold insulating material is attached, such as an outer wall of a freezer. As the polymer porous body (1), a polyurethane porous body, an ethylene / vinyl acetate copolymer (hereinafter referred to as “EVA”), etc. are used, and those having a density of 0.01 to 0.4 are preferable. If the density is less than 0.01, the strength will be insufficient and the durability will be poor, and if it exceeds 0.4, the cold insulation will be insufficient and the object of the present invention will not be achieved. The polyurethane polyurethane is obtained by reacting an isocyanate and a polyol as main raw materials and using a trialkylamine or a trialkyldiamine as a catalyst.

Most efficiently, porous bodies are made directly from polyethers and diisocyanates in a one-step process. As a cell stabilizer, an anion or cation surfactant is used in the case of polyester type urethane foam, and various silicone oils are used in the case of polyether type in order to stably maintain carbon dioxide gas generated by the reaction of isocyanate in the matrix. Is used. Both reduce the surface tension of the bubbles and help stabilize the bubbles produced. Fillers and the like are used as other auxiliaries. Organic foaming agents and volatile foaming agents are most often used as the foaming agent for making the material porous, and those made porous by fluorocarbon have good heat insulating properties. The EVA porous material has a vinyl acetate content of 15 to 30% polymerized by a high-pressure polymerization method, an emulsion polymerization method, a solution polymerization method, a melt index (JIS K6760-1966) 3 to 300, and a Vicat softening point (ASTM D1525-58T). ) Those having a pore size of 30 to 70, which are made into a porous body by a foaming agent such as an azo compound, a sulfonyl, or a hydrazide, are used.

[0006]

[Action and effect]

 Since both of the porous bodies used in the present invention are flexible porous bodies, they are well adapted even if the outer wall (3) of a freezer (or refrigerator) as shown in FIG. It can be applied smoothly and securely. In addition, since the surface of the porous body (1) is covered with the cloth or the leather (2) after the sticking, it is not damaged by repeated wear for a long time or contact with other objects. In addition, since a porous material with excellent heat insulating properties was selected as described below, it also has an excellent cold-retaining effect. Cooling effect is not compromised. In addition, the cold insulating material of the present invention can be applied to other covers such as boots used in cold regions.

[0007]

【Example】

Polyurethane foam, EVA foam, polystyrene foam, phenol resin foam (all having a thickness of 5 mm) are used as the cooling material of the present invention, and polyester fiber woven cloth is used as the cloth (2). A polychloroprene adhesive was applied to one side of all the foams. These cold insulation materials are made of polyester fiber woven fabric on the front side, and a freezer (inlet 300 x 200 mm, depth 500 mm, temperature -7 ~) is installed in a domestic electric refrigerator (content volume 400 liters, temperature 1-3 ° C). It was attached to the outer surface (-10 ° C.) (having a slightly convex surface), and the results shown in the table below were obtained. Specific gravity Adhesion ^{* 1} Frost adhesion status ^{* 2} Scratch status ^{* 3} Polyurethane 0.1 〇 〇 〇 0.2 〇 〇 〇 0.4 〇 〇 〇 EVA 0.1 〇 〇 〇 〇 0.2 0.2 〇 〇 〇 0 0.4 ○ ○ ○ polystyrene 0.1 × × × 0.2 × × × 0.4 × Δ × phenol resin 0.2 × × × * * 1: Workability when sticking to the surface of the freezer was investigated and extremely The ones that are easy to attach are indicated by ◯, and those that are very difficult to attach are indicated by x. * 2: Open and close the freezer lid 3 times a day for about 10 seconds, and after 20 days, check the inside of the frost adhesion state. Those having a thickness of 1 to 2 mm attached to the entire surface are indicated by x. * 3: In order to increase the contact with other objects on the surface of the freezer, place a large number of packs filled with the contents around it, frequently remove and insert it, and continue for about half a year. The surface was examined for scratches, and those with no scratches were marked with ◯, and those with scratches were marked with x.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a use state of a cold insulating material of the present invention.

[Explanation of symbols]

 1 Polymeric porous body 2 Cloth or leather 3 Object to which a cold insulating material is attached

Claims (2)

[Scope of utility model registration request] 1. A cold insulator in which a cloth or leather (2) is attached to the surface of a flexible polymer porous body (1). 2. The density of the porous polymer is 0.01 to 0.4.
The cold insulating material according to claim 1, which is g / cm ³ .