JPS599051A - Humidifying sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] j# The present invention provides a method in which the saturated aqueous solution has a humidity control function including an intermediate layer consisting of a saturated aqueous solution of a compound imparting various degrees of suppleness (hereinafter referred to as a humidity control compound) and a water-retentive substance. It concerns the seat.

In the chemical, food, construction industry, and physiological chemistry experiments, etc., it is necessary to obtain constant humidity conditions, and in most cases, humidity control effects such as humidification and dehumidification are performed mechanically, or saturated aqueous solutions of humidity control compounds are used. The method was to use Mechanical methods are used in a fixed manner as air conditioning equipment in building spaces, rooms, etc. On the other hand, the method using a saturated salt aqueous solution of a humidity control compound is mainly used in physical and chemical experiments to control the humidity in relatively small sealed spaces such as inside desiccators and flasks. Since the object having the . The present invention was obtained as a result of various studies aimed at solving such problems, and the present invention is based on a porous powder having water-retaining properties that retains a saturated aqueous solution of a humidity control compound well in its pores without changing its volume. In addition, we focused on the fact that no liquid is released even under slight pressure, and there is little volatilization as vapor, and a mixture of a humidity control compound and a saturated aqueous solution is placed between the water vapor barrier layer and the water vapor permeable layer. We have now completed a sheet with a humidity control function that has a similar structure.

Next, the configuration of the present invention will be described.

The present invention provides a water vapor blocking coating solution comprising a non-aqueous resin binder mixed with at least 20 parts by weight or more of a humidity control compound per 100 parts by weight of the resin binder at the same ratio of 1 minute, and further mixed with a water-retaining powder. This is a type of German structure in which a moisture-permeable material is partially coated with a film, and the non-coated portions of the base material are coated with a contact N-shaving, and then a moisture-permeable material is layered. As shown in Figure 1 of the drawings, the vapor barrier material (1) is adhered to the vapor permeable material (4) by means of a partial adhesive layer (3), while a coating containing a moisture control compound is applied. Layer (2) is surrounded by these three.

This sheet is in a dry state immediately after the two films are laminated, but when using it, it must be immersed in water for a short time, or
It is left under 100% humidity conditions to sufficiently transfer moisture to the intermediate layer and dissolve wet compounds before use.

Next, the substances constituting the wet sheet in Claim 1 will be explained in detail.

The humidity control compound used in the present invention, which imparts various humidity levels to the hydration aqueous solution, is preferably a known compound shown in %-1, but is not limited thereto.

These humidity control compounds are used in powder form in the present invention. The powder particle size is 35 menyu or less, preferably 1
00 mesh or less is suitable. If the powder particle size is small, the stability, fluidity, and coating workability of the coating solution will be reduced when it becomes a coating liquid. It also reduces the solubility of the humidity control compound during use.

Next, the porous powder having water-retaining properties is not particularly limited as long as it is a substance that is inert to the aqueous solution of the humidity control compound and has the water-retaining property of the aqueous solution of the same compound.

Inorganic substances include zeolite, pearlite, activated clay,
Powders of talc, silicon oxide, calcium silicate talc, bentonite, acid clay, diatomaceous earth, calcium carbonate, etc. are suitable as such porous powders. Yes! 'jJ, as a material, activated carbon, molecular sieving carbon,
etc. are suitable as porous powders.

These porous powders are used to smoothly receive and receive moisture for dehumidification and humidification when the sheet has a humidity control function.

The particle size is preferably 35 mesh or less, and the amount used is preferably at least 20 parts by weight per 100 parts by weight of the resin binder.

Suitable solvents for the resin binder in which these humidity control compounds and porous powders are mixed and dispersed include alcohols, acetic esters, ketones, and hydrocarbon solvents such as n-hexano and toluene.

Next, as the binder resin, one type or a mixture of polyamide resin, linear thermoplastic polyester resin, vinyl chloride-vinyl acetate copolymer, cyclized rubber, chlorinated rubber, chlorinated polypropylene, urethane, etc. is preferable.

Next, as an adhesive for partially adhering the water vapor barrier material (1) and the moisture permeable material (4), it is possible to use an adhesive that does not lose the flexibility of the present sort and is resistant to moisture control compound aqueous solution. There are no particular restrictions on the adhesive, but ordinary urethane can be used.
Isocyanate-based reactive adhesives are suitable.

As the water vapor barrier material, ordinary plastic films, metal foils, or laminates and films thereof are preferred, and soft vinyl chloride films and polyester films with lft (;IE) in the humidity control compound aqueous solution are preferred.

The moisture permeable material (4) is preferably a flexible and stretchable material, such as paper, nonwoven fabric, cloth, or other material with a low degree of sizing.
Or microporous, highly water resistant and chemical resistant.
Polymer nonwoven films such as polyethylene, polypropylene, fluororesin, etc. are most suitable.

The humidity control compound and porous powder can be mixed with the resin binder using a normal stirring operation, which improves the stability of the coating solution and
Viscosity, fluidity, coating] Non-aqueous dispersion i'flll, antifoaming agent, viscosity adjustment h11 coloring ff1J to improve workability, etc.
Additives such as these are added as necessary to prepare a coating liquid.

For the coating solution of the present invention, a coating method normally used for solvent-based coating agents is used.

In order to obtain the partial coating pattern that is the object of the present invention, the gravure method used in printing is most suitable, but the Flukescreen method and the W-Lecoat method can also be used. The coating shape of the coating liquid containing the iMl odorizing compound can be any shape, such as spots, stripes, spirals, etc., but it must be sandwiched by the adhesive layer (3) and the two upper and lower films. Must be.

After drying, the humidity control compound and the powder particles of the water retention agent are exposed on the binder film, facilitating the dissolution of the humidity control compound in water. Furthermore, the surface of the binder film is non-adhesive.

The moisture control compound of the sheet of the present invention is used as a mixed film with a resin binder, and the moisture control compound is used as a mixed film with a resin binder, and the water vapor barrier material, adhesive side,
Because it is coated in a shape surrounded by moisture-permeable material, it can prevent it from falling off or moving due to friction, pressure, vibration, or changes in shape due to absorption or dehumidification, and it also reduces the humidity control ability. A high sheet-like dry shaving can be obtained.

Further, in the humidity control sheet of the present invention, the humidity control capacity is controlled by the area of the sheet used and the weight part of the humidity control compound in the coating solution (1).

The humidity control sheet of the present invention can control the humidity within a unit space in an extremely simple manner, that is, by simply placing the humidity control sheet side by side, and its use is not only in physiological and chemical experiments but also in food preparation. To stabilize the humidity in the packaging and prevent food from deteriorating due to dehumidification or moisture absorption. In addition, when used as wallpaper as a building material, it not only allows indoor humidity to be adjusted, but also has the effect of preventing dew condensation.

Furthermore, in order to prevent the generation of static electricity induced by a drop in humidity, it can also be used as a sap material for preventing electrostatic damage, which is used to store electrical and electronic components, record discs, etc.

Example 4 Powdered potassium bromide of 0 μm or less was mixed and dispersed in a binder in which vinyl chloride-vinyl acetate copolymer resin (Vinyrite VMCH: manufactured by Union Carbide) was dissolved in ethyl acetate, and silicic anhydride powder was further added and mixed. disperse.

The solid content ratio of the liquid is potassium bromide/silicic anhydride/binder resin = 1/]-/], and the solid content of the entire liquid is 40%.
Toshida.

Next, a lattice pattern gravure plate with a depth of 80J/1n-150μ was used to partially coat and dry a polyester film of 12μ, and then a polyester film was coated using a reciprocal lattice pattern gravure plate with a depth of 150j'/1n-60μ. After drying and removing moisture (humidity - curing reaction) on the non-coated areas, dry lamination was carried out with a polymeric nonwoven fabric (NF Sissy, Tokuyama Soda) to obtain a sheet having a humidity control function on one side.

Next, this sheet was cut into 300 ca pieces, immersed in water for 10 minutes, taken out, lightly wiped off the moisture on the surface, and heated for 5 r.
When the sample was left in a capacity desiccator and the humidity inside the desiccator was measured after 2 hours at 25 DEG C., it showed a humidity of 80%, indicating that it was exhibiting a good humidity control function.

[Brief explanation of the drawing]

The drawings show a practical example of the present invention, and FIG. 1 is a partially cutaway perspective view of the humidity control sheet of the present invention. +11...Water vapor barrier sheet (2)...Coating layer (3)...Adhesive layer (4)...Moisture permeable sorting patent applicant Toppan Printing Co., Ltd. Representative Kazuo Suzuki Figure 1 Procedure ``■ Positive circle l1 1985 J/Monday Mr. Commissioner of the Patent Office 1, Indication of the case 1988 Patent application No. 117952 Bow 2, Name of the invention Humidity control Sea 1-3, Person making the amendment With the case Related Patent Applicant Address 1-5-1 Taito, Taito-ku, Tokyo Name (/
r19) Toppan Printing Co., Ltd. 5, Subject of amendment a) 4th page for details written clearly by type printing 6, Contents of amendment a) As shown in the attached sheet

Claims (2)

[Claims] (1) A humidity control sheet comprising a porous powder having water-retentive properties and a humidity control compound whose saturated aqueous solution provides various humidity levels interposed between two sheets. (2) The moisture control sheet according to item (1) above, wherein the two sheets are a water vapor barrier sheet and a moisture permeable sheet.