JP3906971B2 - Package - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a packaging body for precision equipment that needs to prevent temperature drop or prevention of condensation, specifically, a packaging body such as a packaging box, packaging bag, cases, etc., and particularly to a packaging body that exhibits its effect in a cold environment. .
[0002]
[Prior art]
In order to maintain the performance and functions of precision equipment, the lower limit of the environmental temperature is constrained, and in cold conditions, the operation is incomplete due to condensation due to a rapid temperature drop, such as communication and image shooting. May cause problems. In order to avoid such a situation, the cover case is made of a material with excellent heat retention or a material with a heat insulation function that is laminated, but it has a large thickness and is shaped and handled according to the shape of the equipment. There were drawbacks such as poor operation caused by condensation.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and has an object of facilitating the use of precision instruments such as cameras, videos, and personal computers in the cold.
[0004]
[Means for Solving the Problems]
The technical configuration of the present invention for solving the above-described problems is as follows. That is,
1. Highly hygroscopic fine particles having a high hygroscopic fine particle having an average particle diameter of less than 2 μm via a hydrophilic resin containing at least a hydrophilic silicone resin on at least a part or the entire surface of a package composed of a single layer or multiple layers A moisture absorption / water absorption exothermic structure having a maximum temperature increase of 3 ° C. or more at the time of moisture absorption and / or water absorption that is adhered so that the mass ratio of the hydrophilic resin to 10/1 to 19/1. Characteristic packaging.
[0005]
2. 2. The package according to item 1, wherein the moisture absorption / water absorption exothermic structure retains heat generation during moisture absorption for 30 minutes or more and / or heat generation during water absorption for 1 minute or more.
[0006]
3. 2. The package according to item 1, wherein the maximum temperature rise during water absorption of the moisture absorption / water absorption exothermic structure is 8 ° C. or more.
[0007]
4). 2. The package according to item 1, wherein the highly hygroscopic fine particles applied to the hygroscopic / water-absorbing exothermic structure are organic fine particles.
[0008]
5. Highly hygroscopic organic fine particles imparted to the hygroscopic / water-absorbing exothermic structure are polystyrene-based, polyacrylonitrile-based, polyacrylic ester-based, or polymethacrylic ester-based vinyl polymers. Item 2. The package according to item 1, which is a crosslinked polymer having at least one hydrophilic group of an acid group, a phosphoric acid group, or a metal salt thereof, and crosslinked with either divinylbenzene, triallyl isocyanate, or hydrazine. body.
[0009]
6). 2. The package according to item 1, wherein the average particle size of the highly hygroscopic fine particles used in the hygroscopic / water-absorbing exothermic structure is 0.8 μm or less .
[0010]
7). 2. The package according to item 1, wherein the highly hygroscopic fine particles used in the hygroscopic / water-absorbing exothermic structure are fixed to the structure via a hydrophilic resin.
[0011]
8). Package as claimed in 1 wherein the weight ratio of the highly hygroscopic fine particles and a hydrophilic resin used in the moisture / water pyrogenic structure characterized in that it is a 15 / 1-19 / 1.
[0012]
9. The moisture-absorbing / water-absorbing exothermic structure is a knitted fabric, a woven fabric, a non-woven fabric, a fleece, a string-like body, a film or a resin molded body composed of natural fibers, synthetic fibers or mixed fibers thereof. The package described.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
[0014]
The package in the present invention preferably includes an outer layer portion having waterproofness, stretchability and flame retardancy. Further, the outer layer portion may be a single layer or may be a laminate of a film on the inside.
[0015]
Non-limiting examples of the outer layer portion include a woven or knitted fabric having a polyurethane wet coating, a polyurethane / acrylic wet coating, or the like, or a woven or knitted fabric having flame retardancy, or a tetrafluoroethylene film or a polyurethane film as the waterproof film. Woven or knitted fabric obtained by laminating or sticking.
[0016]
Structures used in the present invention include polyester-based, polyamide-based, polyacrylonitrile-based, polyethylene-based, polypropylene-based, polyurethane-based, polyphenylene sulfide-based synthetic fibers, rayon, acetate and other chemical fibers, cotton, hemp, silk , Knitted fabrics, woven fabrics, non-woven fabrics, fleece, string-like bodies or films or resin molded bodies made of natural fibers such as wool and feathers, or mixed materials thereof, and used as an inner layer portion or as a single body It can be used, and when moving to a low-temperature environment, moisture in the air existing in the package and the equipment or in the space inside the equipment is condensed so that the operability of the equipment is not hindered.
[0017]
The highly hygroscopic fine particles of the present invention (hereinafter also referred to as “highly hygroscopic / water-absorbing exothermic fine particles”) are not particularly limited in terms of chemical structure as long as they are fine particles that exhibit exothermic properties during moisture absorption or water absorption. For example, various organic fine particles such as inorganic type such as hygroscopic silica, or hygroscopic polyurethane type, polyamide type, polyester type and polyacrylate type can be applied. Particularly, highly hygroscopic / absorbing exothermic organic fine particles. Preferably, for example, any vinyl polymer of polystyrene, polyacrylonitrile, polyacrylate, polymethacrylate, sulfonic acid group, carboxylic acid group, phosphoric acid group, or a metal salt thereof The crosslinked polymer fine particles having at least one kind of hydrophilic group and crosslinked with either divinylbenzene, triallyl isocyanate or hydrazine.
[0018]
The particle size of the highly hygroscopic fine particles is preferably as fine as possible from the viewpoint of moisture absorption / water absorption heat generation rate / heat generation efficiency, uniform adhesion, texture and wear resistance, and an average particle size of 0.8 μm or less is more preferable.
[0019]
The method for applying the highly hygroscopic / water-absorbing exothermic fine particles of the present invention is a method of directly kneading into fibers or attaching to a surface layer of a knitted fabric, a woven fabric, a nonwoven fabric, a fleece, a string-like material, a film, and a resin molded product via a binder resin Although the method may be mentioned, the latter attachment method through a binder resin is preferable from the viewpoint of moisture absorption / water absorption heat generation rate / heat generation efficiency.
[0020]
As the binder resin, conventional impregnation method, padding method, coating method, silicone chromatography emission system that can be applied to spraying, urethane, acrylic, polyester, polyamide, include resins such as polyethylene oxide, parent aqueous In other words, it is excellent in hygroscopicity, water absorption, and moisture permeability, does not interfere with the excellent hygroscopicity / water absorption properties of the highly hygroscopic / water-absorbing exothermic fine particles, and effectively bonds the high-absorption / water-absorbing exothermic fine particles to the structure. it is a type of excellent binders ability to immobilize. Particularly preferred hydrophilic resin binders include hydrophilic silicone-based resins, hydrophilic urethane resins in which a polyalkylene oxide addition type, polar hydrophilic group type such as sulfonate and carboxylate, amide modification, etc. are introduced as hydrophilic segments. Resin, hydrophilic polyamide resin, and hydrophilic polyethylene oxide resin, which have high moisture absorption and moisture permeability and do not inhibit water absorption. Here, the moisture permeability of the resin means the moisture permeability in a non-porous film state. Even in a resin having high moisture permeability expressed in a microporous film, a binder resin having low hygroscopicity and water absorption of the resin itself masks and reduces the excellent hygroscopic heat generation or water absorption exothermic property of the high moisture absorption / water absorption exothermic fine particles. In order to improve the durability of these highly hygroscopic / water-absorbing exothermic fine particles and hydrophilic resin binders, various crosslinking agents such as isocyanate, methylol, ethyleneimine, polyfunctional aziridinyl, and metal salt are used in combination. You may use together in the range which does not reduce the original moisture absorption / water absorption of microparticles | fine-particles.
[0021]
In the present invention, the mixing ratio of the highly hygroscopic / water-absorbing exothermic fine particles and the hydrophilic resin and the amount of adhesion thereof greatly affect the hygroscopic / absorbing exothermic property. Mixing ratio of the high moisture / water heating particles and a hydrophilic resin by the hydrophilic level of the hydrophilic resin is slightly different mixing ratio is 10/1 to 19/1, good Mashiku is 15 / 1-19 / The smaller the mixing ratio of the hydrophilic resin, such as the mixing ratio of 1, the better the moisture absorption / water absorption exothermicity. However, if the amount of hydrophilic resin is extremely small or not used in combination, the wear durability of the highly hygroscopic / water absorbing exothermic fine particles adhering to the surface of the structure is lowered, and it tends to fall off. On the other hand, when the blending ratio of the hydrophilic resin is large, even if the hydrophilic resin is used, the high moisture absorption / water absorption exothermic fine particles often inhibit the inherent moisture absorption / water absorption. The heat generation rate and the heat generation amount are extremely reduced. Of course, when the moisture absorption / water absorption of the hydrophilic resin is equal to or higher than the high moisture absorption / water absorption exothermic fine particles, the blending ratio of the hydrophilic resin can be increased.
[0022]
The exothermic property of the hygroscopic / water-absorbing exothermic structure of the present invention is based on the heat of adsorption reaction generated when the material absorbs or absorbs water, and the hygroscopicity of the highly hygroscopic / absorbent fine particles contained in the structure and the combined hydrophilic resin binder. Depends on sexual ability and / or water absorption ability and adhesion amount. That is, the higher the hygroscopic / water-absorbing fine particles, the finer the hydrophilic resin binder with higher moisture absorption or water absorption level, the greater the heat generated by the adsorbed moisture, the faster the heat generation rate, and the longer the heat generation holding time. Of course, since such moisture absorption / water absorption is retained even by the structure base material alone, in order to realize more effective moisture absorption / water absorption exothermic property, the moisture absorption rate of applied moisture absorption / water absorption exothermic fine particles (20 ° C., 65% RH). ) Is preferably 25% or more, more preferably 40% or more. Further, the combined hydrophilic resin preferably has at least a hygroscopic rate (20 ° C., 65% RH) of 3 to 50% which does not inhibit the hygroscopicity / water absorption of the hygroscopic / water-absorbing exothermic fine particles as much as possible. That is, in order to obtain an effective moisture absorption / water absorption exothermic property, the structure having the high moisture absorption / water absorption exothermic property of the present invention has a low moisture absorption rate as much as possible, more preferably close to a completely dry (absolute dry) state. It is important to keep it in a state. Conversely, a structure that has adsorbed moisture above the saturated moisture absorption rate and has generated heat is cooled by heat dissipation and drops to the original temperature. However, if it is dried again and the adsorbed water is removed, the original excellent moisture absorption / Water absorption exotherm reappears.
[0023]
According to the present invention, the structure and the amount of the highly hygroscopic / water-absorbing exothermic fine particles are optimized and adhered via an appropriate hydrophilic resin binder, and the maximum temperature rise upon moisture absorption and / or water absorption is 3 ° C. Or more, preferably 4 ° C. or more, more preferably 5 ° C. or more. Further, the maximum temperature rise during water absorption is 8 ° C. or more, and the heat generation retention time during moisture absorption is 30 minutes or more, and the heat generation retention time during water absorption. Is maintained for 30 seconds or more, more preferably for 1 minute or more, etc. In terms of overall heat generation performance in terms of moisture absorption / water absorption heat generation rate, heat generation amount, and heat generation retention time, excellent moisture absorption / water absorption heat generation properties that have never been obtained can be obtained.
[0024]
In addition to these excellent high moisture absorption / water absorption exothermic properties, the structure of the present invention has antibacterial and antibacterial, antibacterial, deodorant, antistatic, SR antifouling, and acid rain resistant multi-functionality. Can also be expressed.
[0025]
【Example】
EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. Below, what was described as a part and% means a mass reference | standard. In addition, the measurement and evaluation of the structure in this example were performed by the following methods.
[0026]
<Absolute mass>
The structure sample was dried at 110 ° C. for 6 hours, then placed in a desiccator containing silica gel, temperature-controlled in an environment of 20 ° C. and 65% RH, and mass measurement was performed.
<Hygroscopicity>
Mass measurement after temperature control and humidity control at 20 ° C. and 65% RH for 24 hours was performed and calculated from the following formula.
Moisture absorption rate (%) = {(hygroscopic mass−absolute dry mass) / absolute dry mass} × 100
[0027]
<Hygroscopic heat generation>
After the structure was dried at 110 ° C. for 6 hours, it was placed in a desiccator containing silica gel, and a temperature sensor (for example, manufactured by Anri Keiki Co., Ltd .; 540K MD-5) was attached to a 5 cm × 5 cm measurement sample, The hygroscopic exothermic property at 20 ° C. in a 95% RH environment (for example, a desiccator containing a saturated aqueous solution of potassium sulfate) was measured with a temperature recorder (for example, manufactured by Anritsu Keiki Co., Ltd .; DATA COLLECTOR AM-7052 type).
<Water absorption exothermic property>
After mounting a temperature sensor on a 5cm x 5cm measurement sample of the absolutely dry structure, spraying ion-exchanged water equivalent to 50% of the sample mass uniformly in an environment of 20 ° C and 65% RH, then generating water. The properties were measured with a temperature recorder. Evaluation was made based on the maximum water absorption exothermic temperature and the water absorption exothermic holding time (min) above the sample temperature before water absorption.
[0028]
<Condensation>
A sample of 5 cm × 5 cm was put into a desiccator having an internal volume of 10 to 15 liters, left in a room at 20 ° C. and 80% with the lid opened, and temperature and humidity were adjusted. After 24 hours, the lid of the desiccator is closed and moved to an environment kept at 10 ° C. within 5 minutes. One hour later, the lid was opened and the condensation state of the sample was confirmed.
<Usability>
A camera with the exterior enclosed by the prototype package was conditioned for 24 hours in an environment of 20 ° C and 65% RH, brought into the laboratory at 0 ° C, taken out of the package 60 minutes later, and then shot. Evaluated by operability.
[0029]
[Example 1]
A double knit (weighing 200 g / m ² ) composed of polyester long fiber processed yarn (165 dtex / 48f) was usually used for the base fabric of the highly hygroscopic / water absorbing exothermic structure of the present invention after relaxing scouring, disperse dyeing and drying.
[0030]
Next, high moisture absorption / water absorption exothermic organic fine particles were produced by the following method.
350 parts of a water-soluble polymer of methacrylic acid / p-sodium styrenesulfonate = 70/30 and 35 parts of sodium sulfate were dissolved in 6500 parts of water and charged into a polymerization tank equipped with a vertical stirrer. Next, 15 parts of 2,2′-azobis- (2,4-dimethylvaleronitrile) was dissolved in 2750 parts of methyl acrylate and 330 parts of divinylbenzene and charged into the polymerization tank. Polymerization was performed for a time to obtain a copolymer having a polymerization rate of 88%. Disperse 100 parts of the polymer in 900 parts of water, add 110 parts of caustic soda to this, react at 90 ° C. for 2.5 hours, and hydrolyze the methyl ester part of methyl acrylate. A crosslinked polymer having 4.6 meq / g was obtained. The obtained polymer was dispersed in water, washed, dehydrated, pulverized, classified or filtered to obtain highly hygroscopic / water absorbing exothermic fine particles. The resulting highly hygroscopic / water-absorbing exothermic organic fine particles had a moisture absorption rate of 50% and an average particle size of 0.8 μm at 20 ° C. and 65% RH.
[0031]
As a hydrophilic resin binder, 95 parts of an aqueous dispersion containing 20% of such highly hygroscopic / absorbing exothermic fine particles, 4 parts of TF-3500 (Kao Corporation hydrophilic silicon-based binder; solid content 40%) and Aquaprene WS105 (Meisei Chemical) Immerse the base fabric in a processing padding solution to which 1 part of a hydrophilic urethane-based binder (manufactured by Kogyo Co., Ltd .; solid content 40%) is added, squeeze it with a mangle to a processing solution wet pick-up rate of 100%, and then dry at 120 ° C. Thereafter, dry heat setting was performed at 180 ° C. for 1 minute to obtain a structure. The resulting structure was maintained for 40 minutes at a temperature increase of 6 ° C. due to moisture absorption, and maintained for 2 minutes due to heat generation at 10 ° C. due to water absorption. Condensation was not observed.
[0032]
The resulting structure was configured into a package. The outer layer part is formed by fixing a waterproof polyurethane film to the polyester knitted fabric with an adhesive, and the inner layer part is shaped by attaching a hygroscopic / heat-generating structure to accommodate the camera. It was. As a result of evaluating the usability of the package, it was possible to photograph without problems. This is due to the fact that moisture inside the package is absorbed by moisture absorption accompanying environmental changes to prevent dew condensation and has a heat generation effect.
[0033]
[Comparative Example 1]
A package was prepared with the same configuration except that the double knit using the polyester long fiber processed yarn described in Example 1 was used unprocessed, and the usability was evaluated, but it was cooled by the environmental temperature and did not operate normally. .
[0034]
【The invention's effect】
The packaging body according to the present invention prevents the condensation due to the moisture absorption and water absorption exothermic action due to the change in the external environment due to the effect of the highly hygroscopic exothermic fine particles, and allows the precision electronic devices to operate smoothly in the cold. is there.

Claims (9)

Highly hygroscopic fine particles having a high hygroscopic fine particle having an average particle diameter of less than 2 μm via a hydrophilic resin containing at least a hydrophilic silicone resin on at least a part or the entire surface of a package composed of a single layer or multiple layers A moisture absorption / water absorption exothermic structure having a maximum temperature increase of 3 ° C. or more at the time of moisture absorption and / or water absorption that is adhered so that the mass ratio of the hydrophilic resin to 10/1 to 19/1. Characteristic packaging.   The package according to claim 1, wherein the moisture absorption / water absorption exothermic structure retains heat generation during moisture absorption for 30 minutes or more and / or heat generation during water absorption for 1 minute or more.   The package according to claim 1, wherein the maximum temperature rise during water absorption of the moisture absorption / water absorption exothermic structure is 8 ° C or more.   The package according to claim 1, wherein the highly hygroscopic fine particles applied to the hygroscopic / water-absorbing exothermic structure are organic fine particles.   Highly hygroscopic organic fine particles imparted to the hygroscopic / water-absorbing exothermic structure are polystyrene-based, polyacrylonitrile-based, polyacrylic ester-based, or polymethacrylic ester-based vinyl polymers. The crosslinked polymer having at least one hydrophilic group of an acid group, a phosphoric acid group, or a metal salt thereof, and crosslinked with any of divinylbenzene, triallyl isocyanate, or hydrazine. Packaging body.   The package according to claim 1, wherein the average particle size of the highly hygroscopic fine particles used in the hygroscopic / water-absorbing exothermic structure is 0.8 µm or less.   The package according to claim 1, wherein the highly hygroscopic fine particles used in the hygroscopic / water-absorbing exothermic structure are fixed to the structure via a hydrophilic resin.   The packaging body according to claim 1, wherein the mass ratio of the highly hygroscopic fine particles and the hydrophilic resin used in the hygroscopic / water-absorbing exothermic structure is 15/1 to 19/1.   The moisture-absorbing / water-absorbing exothermic structure is a knitted fabric, a woven fabric, a non-woven fabric, a fleece, a string-like body, a film or a resin molded body composed of natural fibers, synthetic fibers or mixed fibers thereof. The package described.