JP2019011892A - Humidification filter medium and humidification filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold a humidifying filter medium used in a humidifier using a vaporization method by using a humidifying filter medium having humidification durability and which can be used for a long period of time without a large decrease in the amount of humidification. It is to provide a humidifying filter. A humidifying filter medium characterized by containing a synthetic resin, citric acid and glycerin in a non-woven fabric base material. [Selection diagram] None

Description

  The present invention relates to a humidified filter medium and a humidified filter using the same.

  As the humidifying system of the humidifier, there are a vaporization type, a heating type, an ultrasonic type and the like. The vaporization type is a method in which moisture in the humidification filter is vaporized by blowing air to the humidification filter containing water. The heating method is a method in which water is heated with a heater and boiled to change into steam. The ultrasonic type is a system in which water that has become fine particles by applying ultrasonic waves is sent out by a fan. Further, although a vaporization method is usually used, a hybrid method is also known in which another method is used in combination when the humidity decreases. In vaporizing humidifiers and hybrid humidifiers that use the vaporization method, the lower part of the humidifying filter is immersed in water so that the entire humidifying filter is moistened, and the humidifying filter is ventilated to pass through the humidifying filter. Air is humidified and supplied to the room. As a humidifying filter, a filter formed by using a humidifying filter medium made of a nonwoven fabric is known.

  For this reason, a vaporizing humidifier or a hybrid humidifier using a vaporization method requires a humidifying filter that can be used for as long as possible while maintaining the initial humidification amount without frequently replacing the humidifying filter. On the other hand, a humidifier (for example, refer to Patent Document 1) in which a mineral component dissolution / removal agent charging device is attached to a water storage tank for humidification is disclosed, and citric acid or sodium bicarbonate is used. If the supply of water is neglected or the upper part of the humidifying filter where the water cannot be sucked up, the humidified filter material dries, and the mineral components that could not be completely dissolved in the dried part gradually precipitate and adhere, and the passage of time At the same time, the amount of fixing increased, and after a certain period, the amount of humidification was extremely reduced. Moreover, since the mineral component melt | dissolution removal agent input device is required, the humidifier which can be used was limited and there existed a problem in the point of versatility.

  Further, there is disclosed a treatment liquid to be applied to a filter substrate, the treatment liquid containing water and cellosolve or cellosolve acetate (see, for example, Patent Document 2), and a polyhydric alcohol such as glycerin. Are also described as being miscible. Certainly, the moisture retention of the filter base material is improved by including glycerin, but the mineral component concentration at the top of the filter gradually increases with the passage of time and with the movement of water. The components were deposited and fixed little by little, and the amount of fixing increased with the passage of time. After a certain period, the amount of humidification was extremely reduced.

  Further, a humidifier (for example, see Patent Document 3) using a dimensionally stable composition comprising an alkali metal carboxylate, water and other additives is disclosed, and description of glycerol is given as other additives. Similarly, the mineral component precipitated and fixed little by little from the upper part of the filter, and the fixed amount increased with the passage of time. After a certain period, the humidification amount was extremely reduced.

JP 2012-207814 A Japanese Patent No. 4590832 JP-T-2002-516391

  An object of the present invention is to provide a humidifying filter medium used in a humidifier using a vaporization method, which can be used for a long period of time without greatly reducing the amount of humidification, and a humidifying filter medium having humidification durability, and using the humidified filter medium. The present invention provides a humidifying filter formed by molding.

  The present invention relates to a humidified filter medium characterized by containing a synthetic resin, citric acid, and glycerin in a non-woven fabric substrate, and a humidified filter formed by using the humidified filter medium.

  The humidified filter medium of the present invention achieves an effect of obtaining a humidified filter medium having humidification durability that can be used for a long period of time without greatly reducing the amount of humidification in a humidified filter medium used in a humidifier using a vaporization method. doing.

  Hereinafter, the humidified filter medium of the present invention will be described in detail.

  The humidified filter medium of the present invention is characterized in that a nonwoven fabric base material contains a synthetic resin, citric acid, and glycerin.

The basis weight of the humidification filter medium of the present invention is preferably 40~160g / ^{m 2,} more preferably from 50~140g / ^{m 2,} and still more preferably from 60~130g / ^{m 2.} When the basis weight is less than 40 g / m ² , sufficient rigidity cannot be exhibited, and the humidifying filter may be deformed when immersed in water. If the basis weight is larger than 160 g / m ² , the number of fibers constituting the humidified filter medium increases or the amount of adhesive added increases, resulting in a decrease in voids between the fibers and a decrease in the humidification amount.

  The synthetic resin in the humidified filter medium of the present invention will be described. The synthetic resin is not particularly limited, but vinyl chloride, vinyl acetate, and acrylic synthetic resins are preferable, and acrylic resins are more preferable. One of these synthetic resins can be used, or two or more can be used in combination. The acrylic resin is a resin obtained by homopolymerizing or copolymerizing an acrylic acid monomer compound. In the present invention, an acrylic acid-based monomer compound is a monomer compound selected from the group consisting of acrylic acid, methacrylic acid, acrylate, methacrylate, acrylate and methacrylate, and includes acrylamide and methacrylamide. It is. In the case of acrylic esters and methacrylic esters, short chain aliphatic esters having 1 to 5 carbon atoms are preferred. As specific examples of the acrylic resin in the present invention, Rikabond (registered trademark) series manufactured by Japan Coating Resin, Movinyl (registered trademark) series manufactured by Japan Coating Resin, Bonlon (registered trademark) series manufactured by Mitsui Chemicals, Seiden Chemical Examples include the Cybinol (registered trademark) series and the DIC's Boncoat (registered trademark) series.

Dry content of the synthetic resin in the humidification filter medium of the present invention is not particularly limited, with respect to the nonwoven fabric base material is preferably from 10 to 50 g / ^{m 2,} and more preferably 20 to 40 g / ^{m 2} . If it is less than 10 g / m ² , sufficient suction performance may not be obtained. If it is more than 50 g / m ² , sufficient suction performance will be obtained, but it will reach a peak and the humidified filter medium will have high rigidity. Post-processing is difficult until the filter element is assembled.

The citric acid in the humidified filter medium of the present invention will be described. Citric acid can be used without problems as long as it is generally sold. In use, one with high purity is more preferable. The dry content of citric acid is not particularly limited, but is preferably 0.5 to 10 g / m ² and more preferably 1.0 to 5.0 g / m ² with respect to the nonwoven fabric substrate. . When the amount is less than 0.5 g / m ^2, it is difficult to sufficiently dissolve the precipitated mineral component, and when the amount is more than 10 g / m ² , the effect reaches a peak.

The glycerin in the humidified filter medium of the present invention will be described. Glycerin can be used without problems as long as it is generally sold. In use, one with high purity is more preferable. Although there is no restriction | limiting in particular in the dry content of glycerol, It is preferable that it is 0.5-10 g / m < ² > with respect to a nonwoven fabric base material, and it is more preferable that it is 1.0-5.0 g / m < ² >. When the amount is less than 0.5 g / m ^2, it is difficult to obtain sufficient water retention of the humidified filter medium. When the amount is more than 10 g / m ² , the effect reaches a peak.

  It is essential to use both citric acid and glycerin in the humidified filter medium of the present invention at the same time. With only one of them, a sufficient effect cannot be obtained when it is used for a long time without reducing the humidification amount. In the case of citric acid only, when the water supply is neglected or the upper part of the humidifying filter where the suction of water does not reach, the humidified filter material is dried, and the mineral component that could not be completely dissolved precipitates little by little, The amount of fixing increases with the passage of time, and the humidification amount extremely decreases after a certain period. In addition, in the case of only glycerin, the moisture retention of the humidified filter medium is improved, but with the passage of time, as the water moves, the mineral component concentration at the top of the humidified filter gradually increases, and the moisturizing effect cannot catch up, Mineral components are deposited and fixed little by little, and the fixed amount increases with the passage of time. After a certain period of time, the humidified amount extremely decreases. Thus, in order to use it for a long time without reducing the amount of humidification, it is necessary to continuously prevent the mineral components that cause it from sticking little by little. For that purpose, citric acid and glycerin are required. Need to be used together.

  The method for allowing the nonwoven fabric substrate to contain the synthetic resin, citric acid, and glycerin is not particularly limited as long as the component can be contained in the nonwoven fabric substrate as uniformly as possible. A solution or dispersion containing a synthetic resin, citric acid, and glycerin is applied to the nonwoven fabric substrate by a method such as coating, impregnation, or spraying, and the solvent or dispersion medium is removed by a method such as drying. And a method of incorporating glycerin into the nonwoven fabric substrate.

  The nonwoven fabric substrate used in the present invention is not particularly limited, but a spunbond method, a melt blow method, a dry method (thermal bond method, resin bond method, needle punch method, spunlace method, stitch bond method), wet method A nonwoven fabric produced by selecting at least one method from the methods such as the method and the electrospinning method can be used. If necessary, a nonwoven fabric produced by combining these plural methods can be used.

  Nonwoven fabric base materials used in the present invention include polyamide fibers, polyester fibers, polyalkylene paraoxybenzoate fibers, polyurethane fibers, polyvinyl alcohol fibers, polyvinylidene chloride fibers, polyvinyl chloride fibers, Synthetic fibers such as polyacrylonitrile fiber, polyolefin fiber, phenol fiber, etc .; inorganic fibers such as glass fiber, metal fiber, alumina fiber, carbon fiber, activated carbon fiber; wood pulp, bamboo pulp, hemp pulp, kenaf pulp, straw pulp , Bagasse pulp, cotton linter pulp, natural fibers such as cotton, wool and silk; recycled cellulose fibers such as recycled paper pulp and rayon; regenerated from proteins such as collagen, polysaccharides such as alginic acid, chitin, chitosan and starch Fiber etc. can be used. Moreover, the fiber which provided functions, such as hydrophilic property and a flame retardance, to these fibers can also be used. The said fiber can be used individually or in combination.

  The humidifying filter of the present invention is formed by molding the humidified filter medium of the present invention. Examples of the shape include a three-dimensional shape, and examples include a corrugated shape and a pleated shape.

  The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to the examples. In the examples, “%” and “part” represent “% by mass” and “part by mass”, respectively, unless otherwise specified.

Example 1
Acrylic resin Rikabond (registered trademark) FK-68 (manufactured by Japan Coating Resin), citric acid (anhydrous) reagent special grade (manufactured by Komuro Chemicals) and glycerin reagent special grade (manufactured by Komuro Chemicals) in a dry mass ratio of 30 : 5: 5 to obtain a dispersion for impregnation processing. Next, using a spunlace nonwoven fabric of polyethylene terephthalate (PET): rayon = 50: 50 (dry mass ratio) having a basis weight of 90 g / m ^{2 as} a nonwoven fabric base material, the dry content of the dispersion for impregnation processing is 40 g / m ^2. The dispersion was impregnated so that After impregnation, it was dried for 10 minutes in a hot air dryer with an internal temperature of 150 ° C. to obtain a humidified filter medium.

(Example 2)
The dry mass ratio of Rikabond (registered trademark) FK-68, citric acid and glycerin was mixed at 30: 0.5: 0.5, and the dry content of the dispersion for impregnation was 31 g / m ² . Thus, a humidified filter medium was obtained in the same manner as in Example 1 except that the dispersion was impregnated.

(Example 3)
The dry mass ratio of Rikabond (registered trademark) FK-68, citric acid and glycerin was mixed at 30:10:10, and the dry content of the dispersion for impregnation processing was 50 g / m ² . A humidified filter medium was obtained in the same manner as in Example 1 except that the dispersion was impregnated.

(Comparative Example 1)
The dry mass ratio of Rikabond (registered trademark) FK-68, citric acid and glycerin was mixed at 30: 5: 0, and the dry content of the dispersion for impregnation processing was 35 g / m ² . A humidified filter medium was obtained in the same manner as in Example 1 except that the dispersion was impregnated.

(Comparative Example 2)
The dry mass ratio of Rikabond (registered trademark) FK-68, citric acid and glycerin was mixed at 30: 0: 5 so that the dry content of the dispersion for impregnation processing was 35 g / m ² . A humidified filter medium was obtained in the same manner as in Example 1 except that the dispersion was impregnated.

(Comparative Example 3)
The dry mass ratio of Rikabond (registered trademark) FK-68, citric acid and glycerin was mixed at 30: 0: 0 so that the dry content of the dispersion for impregnation processing was 30 g / m ² . A humidified filter medium was obtained in the same manner as in Example 1 except that the dispersion was impregnated.

  The humidified filter media of Examples 1 to 3 and Comparative Examples 1 to 3 were evaluated by the method shown below, and the evaluation results are shown in Table 1.

[Method for evaluating humidification durability]
For evaluation of humidification durability, a humidified filter medium was formed into a pleated humidified filter, and it was evaluated whether it could be operated for 90 days without greatly reducing the amount of humidification with a humidified air cleaner. The humidified filter medium was formed into a pleated humidified filter having a width of 224 mm, a height of 120 mm, a depth of 29 mm, and a pitch interval of 3 mm. The operation was performed with a pleated humidifying filter set in a humidified air purifier (trade name: APM-1010DH, manufactured by Coway). The operation was carried out for 24 hours with a blowing rate of 5.1 m ³ / min, and the amount of water supplied was 3 L per day. The evaluation criteria are as follows.

A: Operation is possible for 90 days without any decrease in humidification amount.
○: Although the amount of humidification slightly decreases, it can be operated for 90 days.
Δ: Although there is a decrease in the amount of humidification, operation is possible for 90 days.
X: The humidification amount is greatly reduced, and operation for 90 days is impossible.

  From the results shown in Table 1, it can be seen that the humidified filter media (Examples 1 to 3) in which the nonwoven fabric base material contains synthetic resin, citric acid, and glycerin are excellent humidified filter media. When the nonwoven fabric base material contains only citric acid as a component other than the synthetic resin (Comparative Example 1), when only glycerin is contained (Comparative Example 2), and when both citric acid and glycerin are not contained In (Comparative Example 3), sufficient humidification durability was not obtained.

The humidification filter medium and the humidification filter of the present invention can be used for a humidifier, an air cleaner with a humidifying function (humidified air cleaner), an air washer, a cold air fan, and the like.

Claims (2)

  A humidified filter medium comprising a nonwoven fabric base material containing a synthetic resin, citric acid and glycerin.   A humidifying filter formed using the humidified filter medium according to claim 1.