JP5620750B2 - Anti-tick sheet - Google Patents

Description

  The present invention relates to an anti-mite sheet.

  A dehumidifying sheet with a hygroscopic agent enclosed in a breathable sheet is used to absorb moisture such as sweat released from outside the body while sleeping under a mattress, or a storage space for a futon or clothing (eg : Chance, closet) and used to dehumidify the storage space. This dehumidifying sheet has the advantage that it can be used repeatedly by drying the hygroscopic agent in the sun after the hygroscopic ability of the hygroscopic agent disappears. Moreover, it is known that the dehumidifying sheet has an anti-mite effect.

  Patent Document 1 describes a tick-proof dehumidifying sheet composed of a dehumidifying sheet in which a hygroscopic agent such as silica gel is encapsulated in a state of being divided into a breathable film or non-woven fabric. It is described that a tick-proof effect is exhibited by lowering the humidity in and around the habitat. In addition, in this Patent Document 1, when the mite prevention effect is further enhanced or the sustained effect is extended, a pyrethroid compound, an organophosphorus compound, a carbamate compound, a chitin synthesis inhibitor, a juvenile hormone-like substance There is a description that organic chemicals such as may be used after being mixed or processed.

On the other hand, in Patent Document 2, boric acid-based glass powder that elutes B ₂ O ₃ at a rate of 1 to 300 mg / g / hour in water at 20 ° C. is a fiber or foam that constitutes a bedding such as a futon, a pillow, or a mattress. It is described that, when dispersed on the surface of the body, the anti-mite effect is exhibited stably over a long period of time.

JP 2001-29730 A JP-A-5-320015

As described in Patent Document 1, a dehumidifying sheet having a structure in which a hygroscopic agent is included in a breathable sheet exhibits an anti-mite effect while the hygroscopic agent has a hygroscopic ability. However, according to the study of the present inventor, when the hygroscopic ability of the moisture absorbent of the dehumidifying sheet disappears, the anti-mite effect also disappears and the mites grow rapidly.
Accordingly, an object of the present invention is a tick-proof sheet comprising a dehumidifying sheet having a structure in which a hygroscopic agent is included in a breathable sheet, and even after the hygroscopic ability of the hygroscopic agent has disappeared, it is highly resistant to mite. The object is to provide a tick-proof sheet having sex.

The inventor of the present invention has disclosed a boric acid glass powder that elutes B ₂ O ₃ at a rate of 1 to 300 mg / g / hour in water at 20 ° C. on the surface of a dehumidifying sheet configured such that a hygroscopic agent is included in a breathable sheet. It was found that when a coating layer formed by dispersing in an organic binder was provided, the effect of suppressing the growth of mites was maintained for a long time, and the present invention was completed.

Accordingly, the present invention provides a boric acid glass powder that elutes B ₂ O ₃ at a rate of 1 to 300 mg / g / hour in water at 20 ° C. on the surface of a dehumidifying sheet in which a hygroscopic agent is contained in a breathable sheet. Is a mite-proof sheet provided with a coating layer dispersed in an organic binder.

Preferred embodiments of the present invention are as follows.
(1) The hygroscopic agent is silica gel.
(2) The boric acid glass powder is dispersed in an amount of 0.1 to 10 g per 1 m ^{2 of} the coating layer.

  The mite-proof sheet of the present invention exhibits high mite-proof properties over a long period of time. By laying the anti-tick sheet of the present invention under the mattress, moisture such as sweat released from outside the body during sleep can be absorbed, and the proliferation of mites in the mattress can be suppressed over a long period of time.

It is a top view of an example of the tick-proof sheet according to the present invention (however, a part of the breathable sheet 2a is cut away). It is the cross-sectional schematic diagram which expanded and represented the cut surface of the AA line of FIG. 1 notionally. It is a graph which shows the result of the mite prevention test of the sample created in Comparative Examples 1 and 2 and Example 1.

  FIG. 1 is a plan view of an example of an anti-tick sheet according to the present invention, and FIG. 2 is a schematic cross-sectional view schematically showing a cut surface taken along line AA of FIG. However, in FIG. 1, a part of the breathable sheet 2a is cut away.

  1 and 2, the anti-tick sheet is attached to the surface of the dehumidifying sheet 3 and the dehumidifying sheet 3 enclosed between the breathable sheets 2a and 2b in a state where the hygroscopic agent 1 is divided into a grid shape. It comprises a coating layer 6 in which boric acid glass powder 4 is dispersed in an organic binder 5.

  Examples of the hygroscopic agent 1 include silica gel, sepiolite, calcium oxide, diatomaceous earth, activated carbon, activated clay, zeolite, white carbon, calcium chloride, magnesium chloride, potassium acetate, dibasic sodium phosphate, sodium citrate, and a water absorbing polymer. Can be mentioned. These hygroscopic agents may be used individually by 1 type, and may be used in combination of 2 or more types. The hygroscopic agent is preferably silica gel, particularly preferably B-type silica gel.

  Examples of the air permeable sheets 2a and 2b include a nonwoven fabric sheet and a flexible porous resin sheet. The breathable sheet is preferably a nonwoven sheet.

As the boric acid-based glass powder 4, one that elutes B ₂ O ₃ in water at 20 ° C. at a rate of 1 to 300 mg / g / hour is used. The boric acid glass powder is gradually dissolved from the surface in water or in a humid atmosphere to elute B ₂ O _3, and the eluted B ₂ O ₃ exerts an anti-mite effect. Examples of boric acid-based glass powder, a main component _{B 2 O 3, B 2 O} 3 -SiO 2 -Na 2 O glass _{powder, B 2 O 3 -Na 2 O} -RO -based glass powder ( R is an alkaline earth metal) and B ₂ O ₃ —Na ₂ O—Al ₂ O ₃ glass powder. Segurocera manufactured and sold by Ishizuka Glass Co., Ltd. can be used for the boric acid glass powder.

  Examples of the organic binder 5 include acrylic binders and urethane binders.

The coating layer 6 may be provided only on one of the upper and lower surfaces of the dehumidifying sheet 3, but is preferably provided on both upper and lower surfaces. In the coating layer 6, it is preferable that boric acid glass powder 4 is dispersed in an amount of 0.1 to 10 g per 1 m ² .

  The coating layer 6 can be attached by, for example, applying a coating solution containing boric acid glass powder, an organic binder, and optionally a curing agent for the organic binder to the surface of the dehumidifying sheet and drying it.

  In the mite-proof sheet of the present invention, carbonaceous material powder may be added to the coating layer 6, or a coating layer containing carbonaceous material powder and an organic binder may be formed on the lower surface or upper surface of the coating layer 6. This carbonaceous material powder has the effect of increasing the drying speed when the dehumidifying sheet is colored black and the dehumidifying agent is dried in the sun. Examples of the carbonaceous material powder include graphite powder, carbon black powder, activated carbon powder, and Bincho charcoal powder.

The following samples were prepared.
Comparative Example 1: A coating liquid containing Seguro Sera (made by Ishizuka Glass Co., Ltd.), a urethane-based binder and a binder curing agent on a non-woven fabric sheet made of polyester has a Seguro Sera content of 1 m ² by gravure printing. An anti-tick sheet sample comprising a non-woven sheet having a coating layer in which segrocera is dispersed, which is applied to 1.0 g and dried.

Comparative Example 2: A tick-proof sheet sample made of a dehumidifying sheet prepared by superposing two polyester nonwoven fabric sheets used in Comparative Example 1 and putting B-type silica gel therebetween, and then sealing the peripheral edge of the nonwoven fabric sheet.

Example 1: The same coating liquid as that used in Comparative Example 1 was applied to each side surface of a dehumidifying sheet prepared in the same manner as in Comparative Example 2, and the content of segurocera per 1 m ² was 1. A tick-proof sheet sample comprising a dehumidifying sheet having a coating layer in which segrocera is dispersed, prepared by applying to 0 g and drying.

  The anti-mite property of each of the samples prepared in Comparative Examples 1 and 2 and Example 1 was in accordance with a tick-proof performance test method (proliferation inhibition test A method) for textile products defined in JIS L 1920 (2007). The method was evaluated. That is, the anti-mite property was evaluated by counting the number of living mites when each sample was allowed to stand for 4 weeks and 6 weeks in an environment of a temperature of 25 ° C. and a relative humidity of 75% together with about 50 mallow leopard mites. In addition, the moisture absorption ability of the B-type silica gel used in the samples of Comparative Example 2 and Example 1 almost disappears after 2 days.

  As is clear from the results of FIG. 3, the sample of Example 1 (anti-tick sheet having a coating layer in which B-type silica gel is encapsulated and in which segurocera is dispersed) is the sample of comparative example 1 (coating layer in which segurocera is dispersed). Anti-tick sheet made of non-woven fabric sheet) and Comparative Example 2 sample (anti-tick sheet with B-type silica gel encapsulated and without a coated layer in which segrocera was dispersed) The number of living ticks is the smallest in any case after placement. This is because, in the sample of Example 1, the dehumidifying effect of B-type silica gel and the anti-mite effect of Segrocera act synergistically while the hygroscopic ability of B-type silica gel is obtained. It is understood that the mite growth is suppressed more strongly than the sample 2 and, on the other hand, after the hygroscopic ability of the B-type silica gel disappears, the mite growth-inhibiting effect is maintained by the anti-mite effect of Segrocera.

DESCRIPTION OF SYMBOLS 1 Hygroscopic agent 2a, 2b Breathable sheet 3 Dehumidifying sheet 4 Boric acid type glass powder 5 Organic binder 6 Coating layer

Claims (1)

In the dehumidifying sheet in which the dehumidifying agent is contained in a breathable sheet formed in a bag shape, the dehumidifying agent is B-type silica gel, and 1 to 300 mg in water at 20 ° C. on both side surfaces of the bag-shaped dehumidifying sheet . An anti-tick sheet, which is provided with a coating layer in which boric acid glass powder eluting B ₂ O ₃ at a rate of / g / hour is dispersed in an organic binder.

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