JP2012175981A - Excrement treatment sheet for animal and method for production of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excrement treatment sheet for animals which can narrow an area on a sheet surface where excrement diffuses.SOLUTION: The excrement treatment sheet 10 for animals includes a liquid permeable surface sheet 20, a liquid impermeable back sheet 30, and a water-absorbing layer 40 that is arranged between the surface sheet 20 and the back sheet 30 and contains water-absorbing resin 42 and hydrophilic fibers 41, wherein the water-absorbing layer 40 further contains a hydrophobizing agent preferably having higher affinity to the hydrophilic fibers 42 than to the water-absorbing resin 41.

Description

  The present invention relates to an animal excrement disposal sheet for treating pet excreta such as dogs and cats, and a method for producing the same. More specifically, an animal excrement disposal sheet comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a water-absorbing layer disposed between both sheets and containing a water-absorbent resin and hydrophilic fibers. About.

  An animal excrement disposal sheet for treating feces and urine of pets such as dogs and cats includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and a water absorption layer disposed between both sheets. Basic configuration. The water absorption layer generally comprises a water absorbent resin and hydrophilic fibers such as pulp. Here, the water-absorbent resin has a high water absorption amount and a water absorption retention force, but is inferior to hydrophilic fibers in terms of water absorption speed. On the other hand, hydrophilic fibers have a low absorption amount but are faster than water-absorbent resins in terms of water absorption speed. Combining these advantages and disadvantages, the hydrophilic fiber mainly absorbs and diffuses in the initial stage of water absorption to catch excrement, and then the water absorbing resin holds it.

  By the way, the animal does not know where to excrete on the animal excrement disposal sheet. This is a significant difference from the absorbent article for humans, in which the excretion position in the absorbent article is usually specified, and is an inherent situation of the animal excrement disposal sheet. Of course, it is preferable from the labor and cost of replacement to enable a plurality of excretion with one sheet. However, as described above, it is not known where to excrete on the sheet, and since animals dislike excretion in wet places, they tend not to excrete again once excreted.

  For this reason, in order to be able to excrete a plurality of times with a single sheet, it is necessary to reduce the area of excrement that diffuses to the sheet surface by a single excretion. In other words, the structure of the absorption layer that suppresses the diffusion of excrement emerges as a new required performance required for the animal excrement disposal sheet, that is, as a new problem.

  As a general theory, as shown in the following Patent Document 1, the hydrophobizing treatment of pulp or the like is known as a so-called sizing agent. However, the sizing agent inherently imparts water repellency to the hydrophilic fiber, and is applied to the weak hydrophobic treatment of the hydrophilic fiber in the water-absorbent article intended for excrement such as animal excrement disposal sheet. That is not known.

  Patent Document 2 below describes that an absorbent resin is subjected to a hydrophobic treatment in an absorbent article for contacting the body. However, the purpose is to prevent initial gel blocking by reducing the absorption rate of the absorbent resin. That is, in patent document 2, it has the structure which aims at the spreading | diffusion to a hydrophilic fiber by reducing the absorption rate of an absorptive resin, and the idea which suppresses the diffusion to the hydrophilic fiber of the above excretion is the thing. There is no disclosure or suggestion.

JP 2008-25074 A JP 2003-88551 A

  As described above, in the prior art, since there is no problem of suppressing the diffusion area of excrement in the animal excrement disposal sheet, no means for solving this problem is known. SUMMARY OF THE INVENTION The present invention has been made in view of the unique circumstances resulting from animal excretion as described above, and an object of the present invention is to solve an unprecedented problem of allowing a single sheet to be excreted a plurality of times. Such a subject is a subject peculiar to the excrement disposal sheet for animals, and is a novel thing which does not arise in the first place from the absorbent article for human beings whose excretion position is specified.

  The inventors of the present invention have intensively studied to solve the above-described problems. As a result, the water-absorbent layer further contains a hydrophobizing agent having a higher affinity for hydrophilic fibers than the water-absorbent resin, so that the water-absorbent resin can be obtained. While maintaining the original physical properties such as absorption rate and amount of absorption, hydrophilic fibers can be weakly hydrophobized, thereby suppressing the spread of excrement and reducing the excretion area, with one sheet The inventors have found that it is possible to excrete a plurality of times and have completed the present invention. Specifically, the present invention provides the following.

(1) A liquid-permeable top sheet, a liquid-impermeable back sheet, and a water-absorbing layer disposed between the top sheet and the back sheet and including a water-absorbing resin and hydrophilic fibers,
The animal excrement disposal sheet, wherein the water absorption layer further contains a hydrophobizing agent that hydrophobizes the hydrophilic fiber.

  (2) The animal excrement disposal sheet according to (1), wherein the hydrophobizing agent is present on the surface of the hydrophilic fiber.

  (3) The animal excrement disposal sheet according to (1) or (2), wherein the hydrophobizing agent is a higher aliphatic alcohol or a higher aliphatic amine.

  (4) The animal excrement disposal sheet according to any one of (1) to (3), wherein the higher aliphatic alcohol or the higher aliphatic amine has 14 to 20 carbon atoms.

  (5) The animal excrement disposal sheet according to any one of (1) to (4), wherein the higher aliphatic alcohol or the higher aliphatic amine has a melting point of 30 ° C or higher and lower than 70 ° C.

  (6) The amount of the hydrophobizing agent added to the water absorption layer is 0.11% or more and 1.1% or less by mass% with respect to the pulp in the hydrophilic fiber, according to any one of (1) to (5) Animal excrement disposal sheet.

(7) The diffusion area as viewed from the surface sheet side after 2 minutes of dropping 80 cc of physiological saline in a cylinder having a diameter of 60 mm in 10 seconds is 300 cm ² or less (1) to (6) Animal excrement disposal sheet.

  (8) A method for producing an animal excrement disposal sheet according to (1) to (7), comprising the step of adhering the hydrophobizing agent to the surface of the hydrophilic fiber. Production method.

  (9) The method for producing an animal excrement disposal sheet according to (1) to (7), wherein the water absorbent resin and the hydrophobizing agent are mixed at a temperature equal to or higher than a melting point of the hydrophobizing agent. Animal excrement comprising: a step of obtaining a mixture, a step of placing the mixture in a water-absorbing layer; and a step of transferring the hydrophobizing agent to the surface of the hydrophilic fiber over a predetermined temperature and time. A method for producing a treated sheet.

  ADVANTAGE OF THE INVENTION According to this invention, hydrophilic fiber can be weakly hydrophobized, maintaining the original physical properties, such as the absorption speed and absorption amount of a water absorbing resin. And conventionally, the hydrophilic fiber absorbs water within a few seconds when the water-absorbing resin starts to absorb, so that excrement is diffused. In the present invention, this diffusion rate is reduced by weak hydrophobicity of the hydrophilic fiber. Decreases and diffusion is suppressed. Since the water-absorbent resin can start to absorb in this state, as a result, the diffusion of excrement can be suppressed and the area of excrement diffusing on the sheet surface can be reduced. This action is more effective when combined with a water-absorbing resin having a high water absorption rate. For this reason, it is possible to excrete a plurality of times with one animal excrement disposal sheet, and it is economical because the user can extend the use period of the excrement disposal sheet and reduce the replacement frequency.

It is a whole perspective view which shows the excrement disposal sheet | seat for animals of this invention. It is sectional drawing which follows the XX line of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the object of the present invention.

[Overall structure of animal excrement disposal sheet]
As shown in FIG. 1, the animal excrement disposal sheet 10 according to the present invention is formed in a planar shape as a whole. As shown in FIGS. 1 and 2, the animal excrement disposal sheet 10 includes a liquid-permeable top sheet 20, a liquid-impermeable back sheet 30, and the top sheet 20 and the back sheet 30. And a water absorption layer 40 that absorbs and holds liquid such as excrement. The outer peripheral edge of the animal excrement disposal sheet 10 has a top sheet 20 and a back sheet 30 joined together by a hot melt adhesive.

The size of the animal excrement disposal sheet 10 can be appropriately selected depending on the size of the target animal and the cage to be accommodated, and is not particularly limited. However, the longitudinal direction (LD) is 30 to 120 cm and the width direction (WD) is 20. To 100 cm. Preferably 600 cm ² or more 12000 ² or less as the area in a plan view.

  The topsheet 20 is disposed so as to cover the water absorption layer 40, and allows liquid such as excrement to pass through the water absorption layer 40 side. Although the surface sheet 20 will not be specifically limited if a liquid permeate | transmits, For example, it is a liquid-permeable nonwoven fabric. Specifically, a thermal bond nonwoven fabric using hydrophilic polypropylene fibers can be used, and a point bond nonwoven fabric, a through-air nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, and the like can be used.

  The back sheet 30 is disposed on the opposite side of the top sheet 20 with respect to the water absorption layer 40 and constitutes a leak-proof layer in the animal excrement disposal sheet 10. The back sheet 30 may be substantially liquid-impermeable, and specifically, a polyethylene non-breathable film can be used, and conventionally known film materials such as polypropylene and polyethylene terephthalate can be used.

[Water absorption layer]
In the present invention, the water absorbing layer 40 is composed of hydrophilic fibers 41 and a water absorbing resin 42. As shown in FIG. 2, the upper layer absorbent paper 413 / upper layer water absorbent resin 421 / upper layer hydrophilic fiber 411 / lower layer water absorbent resin 422 / lower layer hydrophilic fiber 412 / lower layer water absorbent paper 414 are laminated in this order from the surface sheet 20 side. Has been. The lower layer absorbent paper 414 is disposed so that both sides of the lower layer absorbent paper 414 wrap around the entire water absorbent layer 40 and both ends of the upper layer absorbent paper 413.

  In FIG. 2, the upper layer water-absorbing resin 421 is uniformly distributed on the interface between the upper layer absorbent paper 413 and the upper layer hydrophilic fiber 411, and the lower layer water absorbent resin 422 is the interface between the upper layer hydrophilic fiber 411 and the lower layer hydrophilic fiber 412. Is evenly sprayed. This figure is schematic, and the water-absorbent resin 42 actually enters between the fibers of the hydrophilic fibers 41.

  In this embodiment, the upper layer absorbent paper 413, the upper layer hydrophilic fiber 411, the lower layer hydrophilic fiber 412 and the lower layer water absorbent paper 414 constitute the hydrophilic fiber 41 of the present invention, and the upper layer water absorbent resin 421 and the lower layer water absorbent resin. 422 constitutes the water-absorbing resin 42 of the present invention, but in the present invention, the water-absorbing layer 40 only needs to contain hydrophilic fibers 41 and the water-absorbing resin 42, and is not limited to such a layer structure.

For the upper layer absorbent paper 413 and the lower layer absorbent paper 414, preferably, water absorbent paper having a basis weight (weight per unit area) of 10 to 35 g / m ² can be used. A basis weight of 10 g / m ² or more is preferred because it is excellent in strength and hardly broken, and a weight of 35 g / m ² or less is preferred because it does not absorb moisture excessively. A more preferable range of the basis weight is 12 to 25 g / m ² . Specifically, a tissue made from softwood bleached kraft pulp can be used.

The upper layer hydrophilic fiber 411 and the lower layer hydrophilic fiber 412 constituting part of the hydrophilic fiber 41 are preferably made of a hydrophilic material or an absorbent material having a water retention amount of 4 times or less. Specifically, fluff pulp or other pulp, regenerated pulp, wood flour or other cellulosic fibers having a total amount of hydrophilized fiber 41 in animal excrement disposal sheet 10 of 40 g / m ² to 400 g / m ² , point bonds Further, a nonwoven fabric such as through air, a foam material, or the like can be used. Here, the “water retention amount” refers to the residual water absorption amount when 5 g of the material used as the hydrophilic fiber 41 is immersed in water for 10 minutes and centrifuged / dehydrated at 150 G for 90 seconds. The hydrophilic fiber 41 is subjected to a weak hydrophobic treatment on the surface by a method that will be described in detail later.

  A polymer absorbent is used for the water absorbent resin 42 composed of the upper layer water absorbent resin 421 and the lower layer water absorbent resin 422. For example, generally highly absorbable resins such as polyacrylic acid polymers and starch-acrylic acid polymers can be used. Here, the absorption rate of the absorbent resin 42 is preferably high, and specifically, it is preferably 20 seconds or less in the vortex method described in the examples. The feature of the present invention is mainly a hydrophobizing agent. By this, the hydrophilic fiber is weakly hydrophobized, so that the absorption rate of the absorbent resin 42 is increased, thereby preventing the diffusion of excreta more effectively. it can. In this regard, it can be said that the essence of the present invention is that the balance between the water absorption speed and the amount of the hydrophilic fiber and the water absorbent resin is optimized from the viewpoint of the diffusion of excrement in the animal excrement sheet.

[Hydrophobic agent]
Next, the hydrophobizing agent contained in the water absorption layer 40 that is a feature of the present invention will be described. The hydrophobizing agent is for weakly hydrophobizing the hydrophilic fiber 41. For this purpose, a hydrophobic substance that has a higher affinity for the hydrophilic fiber 41 than the absorbent resin 42 is suitable. Specifically, a higher aliphatic alcohol or a higher aliphatic amine can be used as the hydrophobizing agent. Since these alcohols and amines have higher affinity for the hydrophilic fiber 41 than the absorbent resin 42 such as acrylic acid while exhibiting hydrophobicity in the higher aliphatic side chain portion, the absorbency The hydrophilic fiber 41 can be weakly hydrophobized without inhibiting the water absorption of the resin 42. On the other hand, higher aliphatic hydrocarbons (higher alkanes) are not preferred because they have no hydrophilic groups and have no affinity for hydrophilic fibers. Also, higher fatty acids (higher aliphatic carboxylic acids) are not preferred because of their high affinity with water-absorbing resins that also have carboxylic acids, but in the present invention, the effects differ depending on the adhesion method as described later, In general, these substances are not excluded, and the above substances are merely examples of more preferable embodiments.

  Further, as will be described in detail later with reference to experimental examples, the hydrophobizing agent of the present invention was made to adhere to the water-absorbent resin 42 at the initial stage by utilizing the affinity for the hydrophilic fiber 41. Even after that, the hydrophobizing agent is transferred to the hydrophilic fiber 41 having higher affinity over time, and the hydrophilic fiber can be hydrophobized. According to this method, even if the amount of the hydrophobizing agent is small, it uniformly adheres to the entire absorbent resin 42, and the hydrophobizing agent is uniformly transferred to the hydrophilic fiber 41 from there. Low diffusivity can be obtained even with the same blending amount as compared with the direct spray method.

  The higher aliphatic alcohol or higher aliphatic amine used for the hydrophobizing agent preferably has 14 to 20 carbon atoms. If the number of carbon atoms is less than 14, it is liable to be liquefied and difficult to handle, and the hydrophobic treatment may be insufficient due to dropping off from the hydrophilic fibers. However, in the present invention, since the effect differs depending on the adhesion method and the like as described later, these are not generally excluded, and the above carbon number is merely an example of a more preferable embodiment. It is.

  Although the thing of 30-70 degreeC can be used about melting | fusing point of the said hydrophobizing agent, Preferably it is 40 to 65 degreeC. Within this range, the transferability from the absorbent resin 42 to the hydrophilic fiber 41 in the low temperature environment is sufficient, and excessive transfer in the high temperature environment can be suppressed, which is preferable.

The amount of the hydrophobizing agent is preferably 0.11% or more and 1.1% or less, more preferably 0.28% or more and 1.1% or less in terms of mass% with respect to the pulp in the hydrophilic fiber. Further, the per unit area of the animal waste collection sheet is preferably 0.13 g / ^{m 2} or more 1.3 g / ^{m 2} or less, more preferably at 0.33 g / ^{m 2} or more 1.3 g / ^{m 2} or less . By setting it within this range, moderately weak hydrophobicity can be imparted to the hydrophilic fiber.

[Method of applying hydrophobizing agent]
Next, a method for applying the hydrophobizing agent to the water absorption layer 40 will be described. In the present invention, the method for applying the hydrophobizing agent to the water absorbing layer 40 is not particularly limited, and may be applied directly to the hydrophilic fiber 41 or indirectly to the hydrophilic fiber 41. As an example of indirectly imparting, a water absorbent resin 42 and a hydrophobizing agent are mixed in advance to obtain a mixture of the water absorbent resin 42 and the hydrophobizing agent, and then placed in the water absorbing layer 40, and then hydrophobized. The agent can be applied by shifting to the hydrophilic fiber side.

  An example of a method of mixing the water absorbent resin 42 and the hydrophobizing agent will be described. The mixing ratio of the hydrophobizing agent to the water absorbent resin 42 can be set as appropriate. For example, it is 0.5% or more and 2.0% or less by mass% with respect to the water absorbent resin 42. First, the water-absorbing resin 42 and the hydrophobizing agent are mixed and placed in a heat-resistant container. Stir for 10 minutes and cool at room temperature. A mixture of the water-absorbent resin 42 and the hydrophobizing agent can be obtained by repeatedly performing the above treatment two or three times as necessary. In this state, since the treatment is performed at a temperature equal to or higher than the melting point of the hydrophobizing agent, the surface of the water absorbent resin 42 is coated with the hydrophobizing agent.

This coated water-absorbing resin is sprayed as shown in FIG. 2, for example, by a conventionally known method. Here, the effect of the animal excrement disposal sheet 10 thus obtained will be described with reference to Example 1 (Table 3) described later. This Example 1 is a result of using 1-octadecanol which is a higher aliphatic alcohol having 18 carbon atoms as a hydrophobizing agent. As shown in Table 1 below, the excrement diffusion is as large as 300 cm ² or more at the beginning, but after 10 days at 25 ° C., it is as small as 240 cm ^2, and the effect of reducing the diffusion area is obtained.

  As is apparent from Table 1, the hydrophobizing agent of the present invention has a higher affinity for the hydrophilic fiber 41 than the water absorbent resin 42, that is, it has a hydrophilic functional group while being a hydrophobic substance. Therefore, it is confirmed that the hydrophobizing agent moves to the surface of the hydrophilic fiber 41 to reduce the diffusion area with the passage of a predetermined temperature and time. Here, 10 days at 25 ° C. is a sufficient period until the purchaser uses the animal excrement disposal sheet. This confirms that the hydrophilic fiber 41 can be weakly hydrophobized by allowing it to stand for the above-mentioned period at room temperature, even if the period from actual manufacture to sale is taken into consideration and is practical. is there. In addition, about this period, since it has confirmed that it has fully decreased even after 50 degreeC x 1 day, in the below-mentioned Example, the effect of this invention was confirmed with the diffusion area after all at 50 degreeC x 1 day. .

  In the present invention, of course, the method for applying the hydrophobizing agent to the hydrophilic fibers 41 is not limited to this, and for example, the hydrophobizing agent is dissolved in toluene or the like as a solvent and sprayed directly onto the hydrophilic fibers 41. May be.

  As described above, according to the present invention, the hydrophobizing agent mixed with the water absorbent resin 42 is directly attached to the surface of the hydrophilic fiber 41 or indirectly on the surface side of the hydrophilic fiber 41. The hydrophilic fibers 41 are weakly hydrophobized. Thereby, the liquid diffusion rate by the capillary phenomenon by instantaneous pulp can be reduced, More preferably, the diffusion area of excrement can be reduced by the interaction with the water absorbent resin 42 that absorbs at a high rate. As a result, an excellent effect that has not been achieved in the past can be achieved in which a single sheet can be excreted a plurality of times. In addition, the diffusion area as used in the field of this invention can be measured by the method as described in an Example.

Hereinafter, the present invention will be described in more detail with reference to examples.
[Production Example (Example 1)]
The animal excrement disposal sheet 10 having the configuration shown in FIG. 2 was manufactured by the following method and materials.

  In Example 1, as a method for imparting the hydrophobizing agent to the water absorbing layer 40, a method of transferring the hydrophobizing agent mixed in the water absorbent resin 42 to the hydrophilic fiber 41 was used. Hereinafter, a mixing method of the water absorbent resin 42 and the hydrophobizing agent will be described.

As the water absorbent resin 42, a polymer absorbent having a vortex of 16 seconds, an average particle size of 300 μm, a water absorption ratio of 60 times, and a water retention ratio of 40 times was used. The amount of the upper water absorbent resin 421 used was 45 g / m ² , and the amount of the lower layer water absorbent resin 422 used was 21.6 g / m ² . In addition, the numerical value of a vortex method was obtained by measuring with the following procedures.
1) Set 0.9% sodium chloride aqueous solution (reagent grade 1) at 25 ° C ± 1 ° C,
2) Put a rotor in a 100 ml beaker, add 50 g of the aqueous solution of 1) and stir at 600 rpm,
3) After 2 g of the water-absorbing resin to be tested is added, the time from the disappearance of the liquid surface due to water absorption swelling is measured as vortex seconds.

  As the hydrophobizing agent, powdery 1-octadecanol, which is a higher aliphatic alcohol having 18 carbon atoms, was used. With respect to the addition amount of the hydrophobizing agent to the water absorbent resin 42, the mass% with respect to the water absorbent resin 42 was set to 0.5% (hereinafter, the ratio of the addition amount of the hydrophobizing agent to the water absorbent resin 42 and the like). (Mass ratio) is referred to as “treatment rate.” For example, the treatment rate in Example 1 is 0.5.)

  First, the water-absorbing resin 42 and the hydrophobizing agent are mixed and placed in a heat-resistant container. The water-absorbing water is obtained by warming the heat-resistant container in high-temperature water at 80 ° C. (in other embodiments, the temperature is equal to or higher than the melting point of the hydrophobizing agent). A mixture of the hydrophobic resin 42 and the hydrophobizing agent was stirred for 10 minutes. Next, the mixture of the water absorbent resin 42 and the hydrophobizing agent was cooled to room temperature by storage at room temperature. By repeating the above treatment 2 to 3 times, a mixture of the water absorbent resin 42 and the hydrophobizing agent was obtained.

  Next, the process of forming the animal excrement disposal sheet 10 from the top sheet 20, the back sheet 30, and the water absorption layer 40 will be described. For the water absorbent resin 42 constituting the water absorbent layer 40, the mixture of the water absorbent resin 42 and the hydrophobizing agent obtained in the above step was used.

As other constituent materials, members having the following specifications were used.
Top sheet 20: Thermal bond nonwoven fabric with hydrophilic polypropylene fibers having a basis weight of 18 g / m ² Back sheet 30: Polyethylene non-breathable film with a basis weight of 18 g / m ² Hydrophilic fibers 41: Uniform fluff pulp to a basis weight of 60 g / m ² Stacked material Upper layer absorbent paper 413 and lower layer absorbent paper 414: Tissue made from softwood bleached kraft pulp with a basis weight of 14 g / m ²

  Using the above constituent materials, an animal excrement disposal sheet 10 was produced as follows. First, the lower layer hydrophilic fiber 412 was disposed on the lower layer absorbent paper 414, and the above mixture mixed with the hydrophobizing agent was further spread evenly as the lower layer water absorbent resin 422 thereon. Next, the upper layer hydrophilic fiber 411 was disposed so as to cover the lower layer water absorbent resin 422. The upper-layer water-absorbing resin 421 as a mixture was again sprayed evenly on the upper surface portion of the upper-layer hydrophilic fibers 411 arranged in a stacked manner. Next, 0.8 g of water spray was sprayed on the upper water absorbent resin 421 to prevent the upper water absorbent resin 421 from moving. Further, the upper layer absorbent paper 413 was placed so as to cover the upper layer water absorbent resin 421.

Water absorption in which the lower layer absorbent paper 414, the lower layer hydrophilic fiber 412, the lower layer water absorbent resin 422, the upper layer hydrophilic fiber 411, the upper layer water absorbent resin 421, and the upper layer absorbent paper 413 are stacked in this order from the bottom. The emboss plate was put on the whole layer 40, and it pressed for 10 second at 20 g / cm < ² > using the hydraulic press. Further, a flat acrylic plate was placed on the water absorption layer 40 and pressed at 20 g / cm ² for 1 second. Thereafter, the surface sheet 20 is disposed on the surface of the water absorbent layer 40 on the upper layer absorbent paper 413 side, the back sheet 30 is disposed on the surface of the absorber on the lower layer absorbent paper 414 side, and the peripheral portions of the surface sheet 20 and the back sheet 30 are Were laminated using a hot melt adhesive.

  Through the above steps, the animal excrement disposal sheet 10 having the structure shown in FIGS. 1 and 2 having a size of LD405 mm and WD300 mm as a whole was produced, and Example 1 was obtained.

[Production Examples (Comparative Examples, Examples 2 to 14, Reference Examples 1 to 7)]
In Example 1, what was manufactured without using any hydrophobizing agent, that is, without passing through the step of applying the hydrophobizing agent to the water-absorbent resin 42 was used as a comparative example. Moreover, what changed the treatment rate of the hydrophobizing agent and the member which adds a hydrophobizing agent in Example 1 as shown in the following Table 3 were set as Examples 2 to 10. Further, Examples 11 to 12 and Reference Example 1 were obtained by changing the carbon number of the higher aliphatic alcohol used as the hydrophobizing agent in Example 1 as shown in Table 4 below. Further, Example 13 was obtained by replacing the higher aliphatic alcohol used as the hydrophobizing agent in Example 1 with a higher aliphatic amine. Moreover, what changed the spraying position of the water absorbing resin 42 in Example 1 was set as Example 14 and Reference Example 2. In Example 1, the higher aliphatic alcohol used as the hydrophobizing agent was changed to a higher fatty acid, which was designated as Reference Examples 3 to 5. Further, in Example 1, the higher aliphatic alcohol used as the hydrophobizing agent was changed to a higher hydrocarbon, which were referred to as Reference Examples 6 to 7.

[Test Example 1]
Tables 3 to 6 show the results of evaluating the diffusion reduction performance effect of the animal excrement disposal sheet 10 for Examples, Comparative Examples, and Reference Examples.

In addition, the measurement of the diffusion reduction performance effect of the excrement disposal sheet | seat 10 for animals was implemented in the following procedures.
1) Place a cylinder (diameter 60 mm, 55 g) in the central part of the animal excrement disposal sheet 10 left for 1 day in a non-pressurized state with the surface sheet facing upward in a constant temperature room at 50 ° C., and 80 ml in the central part of the cylinder A burette for artificial urine dripping was dropped on the upper surface 10 mm of the animal excrement disposal sheet 10 and 80 cc of 0.9% physiological saline was dropped. At this time, the dropping start time was set to 0 seconds.
2) The time taken for the physiological saline at the interface between the cylinder and the animal excrement disposal sheet 10 to be absorbed by the animal excrement disposal sheet 10 was measured to obtain the absorption rate.
3) Two minutes after dropping, the diffusion length of physiological saline was measured on the product long side and the short side, respectively. The diffusion area was calculated according to the following procedure. The longest side maximum diffusion (a) mm and the short side maximum diffusion length (b) mm of the elliptical diffusion are measured, and the elliptical area formula (diffusion area (cm ² ) = (a) / 2 × (b) / 2 × Π × 0.01).

  The hydrophobizing agents used in this test example, substance names, carbon numbers, and melting points are as shown in Table 2 above. Hereinafter, each hydrophobizing agent is distinguished by an abbreviation.

As can be seen from the results in Table 3, in the present invention, when a higher aliphatic alcohol is mixed in the water absorbent resin 42 (Examples 1 to 4), both are comparative examples (diffusion area 298.5 cm ² ) and In comparison, a reduction in diffusion area of 10% or more was observed (the diffusion area in Example 1 was 226.7 cm ² ). When the treatment rate of the hydrophobizing agent was in the range of 0.2% to 2.0%, the diffusion area became smaller as the treatment rate of the hydrophobizing agent increased. “G / P” in Tables 3 to 6 represents the amount (g) of the absorbent resin to which the hydrophobizing agent is added per animal excrement disposal sheet 10.

In addition, since the hydrophobizing agent addition amount is 0.1328 g / m ² at the treatment rate of 0.2% in Example 2 (A) and the amount of pulp has two layers of upper and lower basis weights of 60 g / m ² . The total is 120 g / m ² (B). For this reason, the mass% of the hydrophobizing agent with respect to the pulp is A / B (%), which is (0.1328 / 120) × 100 = 0.11%. Similarly, when calculated at a treatment rate of 0.5% in Example 1, the mass% of the hydrophobizing agent relative to the pulp is 0.28%, and when the treatment rate is 1.0%, it becomes 0.55%, and the treatment rate is 2.0%. Then, it becomes 1.11%. From this result, 0.11% or more and 1.1% or less is a preferable mass% range of the hydrophobizing agent with respect to the pulp.

  When the hydrophilic fiber 41 is directly hydrophobized with a higher aliphatic alcohol (Examples 5 to 10), the treatment rate is 0.5 when the upper hydrophilic fiber 411 is hydrophobized. In the case of% or more, the diffusion area was reduced by 10% or more compared to the comparative example. Also in the case where the lower hydrophilic fiber 412 was subjected to a hydrophobization treatment, the diffusion area was reduced by 10% or more in comparison with the comparative example when the treatment rate was 1% or more.

  As can be seen from the results in Table 4, in the present invention, when the number of carbon atoms of the higher aliphatic alcohol used as the hydrophobizing agent is smaller than 30 (Examples 11 and 12), 10% compared to the comparative example. As described above, the diffusion area was reduced. When the carbon number was 30 (Reference Example 1), the diffusion area was not reduced.

  As can be seen from the results in Table 4, in the present invention, when a higher aliphatic amine was used (Example 13), the same results as in the case of using a higher aliphatic alcohol, compared with the comparative example, The diffusion area was reduced.

  As can be seen from the results in Table 5, in the present invention, when only the upper water-absorbent resin 421 was subjected to a hydrophobic treatment (Example 14), the diffusion area was slightly reduced as compared with the comparative example. When only the lower layer water-absorbent resin 422 was subjected to a hydrophobic treatment (Reference Example 2), the diffusion area was not reduced as compared with the comparative example.

  As can be seen from the results of Table 6, in the present invention, when higher fatty acids or higher hydrocarbons are used as hydrophobizing agents (Reference Examples 3 to 5 or 6 to 7), the diffusion area is larger than that of Comparative Examples. Did not decrease.

  According to the animal excrement disposal sheet 10 according to the present invention, the hydrophilic fiber 41 is weakly hydrophobized by a hydrophobizing agent having a higher affinity for the hydrophilic fiber 41 than the water absorbent resin 42. Thus, the area where excrement diffuses on the excrement disposal sheet 10 for animals can be reduced.

DESCRIPTION OF SYMBOLS 10 Animal excrement disposal sheet 20 Top sheet 30 Back sheet 40 Water absorbing layer 41 Hydrophilic fiber 411 Upper layer hydrophilic fiber 412 Lower layer hydrophilic fiber 413 Upper layer absorbent paper 414 Lower layer absorbent paper 42 Water absorbent resin 421 Upper layer water absorbent resin 422 Lower layer water absorbent Resin

Claims (9)

A liquid-permeable top sheet, a liquid-impermeable back sheet, and a water-absorbing layer disposed between the top sheet and the back sheet and comprising a water-absorbing resin and hydrophilic fibers,
The animal excrement disposal sheet, wherein the water absorption layer further contains a hydrophobizing agent that hydrophobizes the hydrophilic fiber.   The animal excrement disposal sheet according to claim 1, wherein the hydrophobizing agent is present on the surface of the hydrophilic fiber.   The animal excrement disposal sheet according to claim 1 or 2, wherein the hydrophobizing agent is a higher aliphatic alcohol or a higher aliphatic amine.   The animal excrement disposal sheet according to any one of claims 1 to 3, wherein the higher aliphatic alcohol or the higher aliphatic amine has 14 to 20 carbon atoms.   The animal excrement disposal sheet according to any one of claims 1 to 4, wherein the higher aliphatic alcohol or the higher aliphatic amine has a melting point of 30 ° C or higher and lower than 70 ° C.   The animal excrement treatment according to any one of claims 1 to 5, wherein the amount of the hydrophobizing agent added to the water-absorbing layer is 0.11% or more and 1.1% or less by mass% with respect to the pulp in the hydrophilic fiber. Sheet. The animal excrement treatment according to any one of claims 1 to 6, wherein a diffusion area viewed from the surface sheet side after 2 minutes is dripped in 80 cc of a physiological saline in a cylinder having a diameter of 60 mm in 10 seconds, is 300 cm ² or less. Sheet. A method for producing an animal excrement disposal sheet according to any one of claims 1 to 7,
The manufacturing method of the excrement disposal sheet | seat for animals provided with the process of making the said hydrophobizing agent adhere to the surface of the said hydrophilic fiber. A method for producing an animal excrement disposal sheet according to any one of claims 1 to 7,
Mixing the water absorbent resin and the hydrophobizing agent at a temperature equal to or higher than the melting point of the hydrophobizing agent to obtain a mixture;
Placing the mixture in the water-absorbing layer;
Transferring the hydrophobizing agent to the surface of the hydrophilic fiber over a predetermined temperature and time; and
The manufacturing method of the excrement disposal sheet | seat for animals provided with this.

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