Resin foam and coating liquid

Abstract

To provide resin foam and coating liquid capable of suppressing generation of powder, and performing more comfortably especially a manufacturing work of flower arrangement.SOLUTION: There is provided resin foam in which at least a part of the surface of a resin foam base material is coated with a covering material containing at least one kind of material selected from a group comprising carboxymethyl cellulose, silicone oil, dextrin, sodium silicate and water-soluble starch.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a resin foam and a coating liquid for surface treatment of the resin foam.

Background Art

[0002] Conventionally, as a technique for arranging flower materials in a container such as a basket and its product, flower arrangement is known. In flower arrangement, instead of a flower holder such as a kenzan used in ikebana (flower arrangement), a resin foam formed by molding a phenolic resin, a urethane resin, or the like into a foamed or porous shape is used. This resin foam has water absorption, is easy to cut, and has a hardness that allows flower materials to be inserted and fixed.

[0003] As a technique related to resin foam, for example, Patent Document 1 discloses a support block body provided in a flower arrangement device, which is made of a foam of a synthetic resin such as a phenolic resin, a urethane resin, or a polystyrene, and has a brittleness that allows easy piercing of a plant branch such as a flower stem and a hardness that supports the plant branch while maintaining the pierced state at an arbitrary angle.

[0004] Further, Patent Document 2 discloses a flower arrangement support made of a synthetic sponge with continuous bubbles made of a foamed polyurethane resin or a foamed polyethylene resin, etc., and having a base portion of a predetermined shape having a non-woven fabric layer and slits on the upper surface side.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, when holding a conventional resin foam in a dry state, for example, part of the outer surface peels off as fine powder due to friction when holding it. And since the generated fine powder scatters and adheres everywhere, there is the inconvenience of soiling the hands, clothes, or the workroom of the operator. For example, florists and flower arrangement businesses usually pre-cut a dry resin foam into a shape and size suitable for each container such as a basket, and insert flower materials into the resin foam after absorbing water for decoration. At this time, a visible amount of fine powder spills from the cut surface of the dry resin foam onto the table where the work is being done, and there is a situation where the working environment is deteriorated.

[0007] Also, recently, in addition to fresh flowers, the use of artificial plants such as artificial flowers, preserved flowers, or dried flowers as flower materials used in flower arrangements has been increasing. However, when using artificial plants as flower materials, unlike fresh flowers, water is not required, so the resin foam is used in a dry state, and the above-mentioned problem of fine powder becomes apparent.

[0008] On the other hand, resin foams dedicated to artificial flowers, which are premised on being used in a dry state, are also manufactured and sold by multiple companies and do exist to some extent. However, even in resin foams dedicated to artificial flowers, although it is boasted that fine powder is less likely to be generated, the suppression effect is insufficient and far from satisfactory. In fact, just by holding these resin foams dedicated to artificial flowers, fine powder will stick to the fingers. Also, since it is necessary to fix the flower materials for a long time, it is designed to be harder than conventional resin foams, and for operators with weak strength, stress may be felt during the decoration work. Furthermore, resin foams dedicated to artificial flowers are more expensive than conventional resin foams and are also inferior in terms of cost performance.

[0009] Furthermore, recently, as part of horticultural therapy, cognitive rehabilitation using flower arrangement has attracted attention, and the opportunities to perform flower arrangement in medical and welfare settings have also increased. Therefore, especially in medical and welfare settings, due to considerations for patients with respiratory diseases, a resin foam that suppresses the generation of fine powder as much as possible is required.

[0010] Therefore, an object of the present invention is to provide a resin foam and a coating liquid that suppress the generation of fine powder and can perform the production work of flower arrangement more comfortably.

Means for Solving the Problems

[0011] As a result of intensive studies to achieve the above problems, the present inventor has found that the above problems can be achieved by the following configuration, and completed the present invention.

[0012] [1] A resin foam in which at least a part of the surface of the resin foam base material is coated with a coating material containing at least one substance selected from the group consisting of carboxymethyl cellulose, silicone oil, dextrin, sodium silicate, and water-soluble starch. [2] The coating material contains carboxymethyl cellulose, and the coating amount of the carboxymethyl cellulose is 0.0002 to 0.002 g / cm 2 The resin foam according to [1]. [3] The coating material contains silicone oil, and the coating amount of the silicone oil is 0.002 to 0.02 g / cm 2 The resin foam according to [1]. [4] The resin foam base material is made of a foam of at least one synthetic resin selected from the group consisting of phenol resin, urethane resin, and polystyrene. The resin foam according to any one of [1] to [3].

[0013] [5] A coating liquid for surface-treating a resin foam substrate, which is an aqueous solution containing water and at least one substance selected from the group consisting of carboxymethyl cellulose, silicone oil, dextrin, sodium silicate, and water-soluble starch. [6] The substance is carboxymethyl cellulose, and the content of the carboxymethyl cellulose is 0.5 to 3 parts by mass with respect to 100 parts by mass of the water. The coating liquid according to [5]. [7] The substance is silicone oil, and the content of the silicone oil is 5 to 25 parts by mass with respect to 100 parts by mass of the water. The coating liquid according to [5]. [8] The substance is dextrin, and the content of the dextrin is 5 to 25 parts by mass with respect to 100 parts by mass of the water. The coating liquid according to [5]. [9] The substance is sodium silicate, and the content of the sodium silicate is 5 to 25 parts by mass with respect to 100 parts by mass of the water. The coating liquid according to [5].

[10] The substance is water-soluble starch, and the content of the water-soluble starch is 15 to 30 parts by mass with respect to 100 parts by mass of the water. The coating liquid according to [5].

[11] The water is electrolyzed water containing 15 to 30 ppm of chloride ions and adjusted to pH 5 to 7. The coating liquid according to any one of [5] to

[10] .

Advantages of the Invention

[0014] According to the present invention, it is possible to provide a resin foam and a coating liquid that suppress the generation of fine powder and can perform the production work of flower arrangement more comfortably.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, the present invention will be described in detail. The description of the constituent elements described below may be made based on typical embodiments of the present invention, but the present invention is not limited to such embodiments. In addition, in this specification, a numerical range represented by "~" means a range including the numerical values described before and after "~" as the lower limit value and the upper limit value.

[0016] [Resin foam] The resin foam of the present invention is a resin foam in which at least a part of the surface of the resin foam base material is coated with a coating material containing at least one substance selected from the group consisting of carboxymethyl cellulose, silicone oil, dextrin, sodium silicate, and water-soluble starch. The resin foam of the present invention can be used not only as a base for flower arrangements but also as a traffic buffer material, a filling material for cassette fuels, or a medium material such as a seedling-growing mat.

[0017] Here, flower arrangement refers to a technique of arranging flower materials in a container such as a basket and its product. Generally, in a flower arrangement, one or more flower materials are inserted into a resin foam accommodated in a container or placed on the container, thereby decorating the container with the flower materials.

[0018] In addition, the flower material refers to a concept including artificial plants such as artificial flowers, preserved flowers, or dried flowers in addition to fresh flowers. That is, the resin foam of the present invention can be used for flower arrangements using either fresh flowers or artificial plants. In addition, the flower material is not limited to those having a corolla, and plant stems, leaves, or roots, etc. of plants or artificial plants can also be used as flower materials.

[0019] When the flower material is an artificial plant, the part inserted into the resin foam such as the stem is constituted by winding paper clay, resin clay, etc. around a core material made of, for example, a metal wire.

[0020] The object to be coated with the above-described coating material, that is, the resin foam base material is not particularly limited, but is preferably a foam made of a synthetic resin (hereinafter abbreviated as "synthetic resin foam"). In addition, the resin foam (strictly speaking, the resin foam substrate covered with the outer surface) can also absorb moisture.

[0021] Examples of the synthetic resin constituting the resin foam substrate include phenol formaldehyde resins (phenolic resins), polyurethane, and polystyrene.

[0022] In addition, as the substance constituting the coating material, as described above, at least one substance selected from the group consisting of carboxymethyl cellulose, silicone oil, dextrin, sodium silicate, and soluble starch is used.

[0023] Here, carboxymethyl cellulose is preferably, for example, a salt of carboxymethyl cellulose. Examples of the salt of carboxymethyl cellulose include carboxymethyl cellulose metal salts. Specifically, due to excellent safety, sodium carboxymethyl cellulose (also known as CMC-Na or sodium cellulose glycolate) is preferably mentioned.

[0024] In addition, silicone oil is a material also used in cosmetics such as hand cream or hair conditioner, and like carboxymethyl cellulose, it is a substance safe for the human body.

[0025] The coating amount of the coating material depends on its components. In the case of carboxymethyl cellulose, it is preferably 0.0002 to 0.002 g / cm 2 and more preferably 0.0003 to 0.0015 g / cm 2 In the case of silicone oil, it is 0.002 to 0.02 g / cm ​2 is preferably 0.005 to 0.015 g / cm 2 and more preferably so. If the coating amount is within the above-mentioned range, the outer surface of the resin foam will not be sticky, and the effect of suppressing the generation of fine powder from the outer surface will be further improved. In particular, when carboxymethyl cellulose is used as a component of the coating material, stickiness can be further suppressed, and the feel is good, so it is suitable.

[0026] Here, the above-mentioned coating amount refers to a value calculated by dividing the difference in mass between the resin foam substrate before coating with the coating material and the resin foam after coating with the coating material by the surface area of the resin foam. Note that the coating amount may also be calculated based on the difference in mass between the resin foam before rinsing and the resin foam substrate after rinsing after rinsing the surface of the resin foam with a solvent such as water and drying for a predetermined time. Further, it may be a value calculated from the mass of the above components contained in the rinsed solvent. Furthermore, it may be a value calculated based on the mass of the above components contained in a portion cut out with a predetermined area (for example, 1 cm 2 ) of the portion including the surface of the resin foam.

[0027] The hardness of the resin foam can be arbitrarily set by changing the material or density of the synthetic resin foam that is the resin foam substrate. Specifically, it is preferable to set the hardness to such an extent that flower materials can be inserted by human power without using special tools and the inserted flower materials can be maintained in a fixed state. With such hardness, it can be easily cut with a cutter knife, etc., so it is also easy for an operator to process it into an arbitrary shape. Note that since the coating material for coating the outer surface of the resin foam substrate is formed very thinly, the resin foam will not become hard due to the coating material, and it will not affect when inserting or cutting flower materials into the resin foam.

[0028] As a method for manufacturing this resin foam, for example, a coating liquid containing a coating material is sprayed onto the outer surface of a synthetic resin foam formed or cut into an arbitrary size as a resin foam base material by spraying or the like, and then dried for a predetermined time to create it.

[0029] The spray may be any of an electric spray using an electric pump or the like as a driving source, a can spray using the high-pressure gas in the can, or an air spray using external air pressure. The number of times of spraying the coating liquid by the spray may be once or divided into a plurality of times. When divided into a plurality of times, for example, for a resin foam base material formed into a cube, it is preferable to spray evenly from a position about 30 cm away, 5 times on the upper surface, and 3 times each on the side surfaces and the bottom surface. At this time, the number of spraying times on the upper surface is more than that on the other surfaces (the coating amount is more) because it is assumed that more flower materials will be inserted on the upper surface.

[0030] Also, the drying after spraying may be forced drying by artificially drying using a hot air dryer, a near-infrared heater, a far-infrared heater, or the like, or natural drying by leaving it in the air at room temperature for a predetermined time. When drying, it is preferable to place the resin foam on a net or the like and dry it, so that the bottom surface can be sufficiently dried.

[0031] Note that the method for forming the coating material is not limited to the method of spraying the coating liquid onto the resin foam base material by spraying or the like. As another method, for example, a method of applying the coating liquid onto the outer surface of the resin foam base material with a brush or the like and then drying it may be used. Also, a method of impregnating the resin foam base material with the coating liquid for a predetermined time and then drying it may be used.

[0032] [Coating liquid] The coating liquid of the present invention is a coating liquid for surface-treating a resin foam substrate, and is an aqueous solution containing water and at least one substance selected from the group consisting of carboxymethyl cellulose, silicone oil, dextrin, sodium silicate, and soluble starch. Since this coating liquid becomes the coating material portion of the resin foam after adhering to and drying on the resin foam substrate, it contains the same substances as those constituting the coating material.

[0033] When the concentration of the coating liquid is low, fine powder cannot be suppressed when coating the outer surface of the resin foam as a coating material. On the other hand, if the concentration is too high, the spray nozzle may become clogged during spraying, or stickiness may occur on the resin foam itself even after drying. For these reasons, the following concentrations are suitable according to each substance. That is, in the case of carboxymethyl cellulose, it is preferably 0.5 to 3 parts by mass, more preferably 0.75 to 1 part by mass, based on 100 parts by mass of water. In the case of silicone oil, it is preferably 5 to 25 parts by mass, more preferably 10 to 20 parts by mass, based on 100 parts by mass of water. In the case of dextrin, it is preferably 5 to 25 parts by mass, more preferably 10 to 20 parts by mass, based on 100 parts by mass of water. In the case of sodium silicate, it is preferably 5 to 25 parts by mass, more preferably 10 to 20 parts by mass, based on 100 parts by mass of water. In the case of soluble starch, it is preferably 15 to 30 parts by mass based on 100 parts by mass of water.

[0034] The water used in the coating liquid is not particularly limited. For example, tap water, distilled water, purified water, electrolyzed water, etc. can be appropriately selected and used in consideration of cost and the like. Among them, for example, weakly acidic electrolyzed water (slightly acidic electrolyzed water) containing 15 to 30 ppm of chloride ions and adjusted to a pH of about 5 to 7 is preferred. Since weakly acidic electrolyzed water has a high bactericidal effect, by using this weakly acidic electrolyzed water as a solvent, it is possible to prevent dirt, the growth of miscellaneous bacteria, or the generation of mold without adding a preservative or the like separately, so it is hygienic. Therefore, in particular, it can be used with confidence even in medical and welfare sites, etc., and is also suitable for use in horticultural therapy described later.

[0035] In addition to the above-mentioned arbitrary substances, the coating liquid may further contain other components. Examples of the other components here include coloring agents, fertilizers, surfactants, antifreezing agents, antifoaming agents, preservatives, antioxidants, thickeners, etc. The types and contents of the other components are not particularly limited and can be selected according to the purpose.

[0036] According to the resin foam of the present invention having the above configuration, the generation of fine powder can be preferably suppressed. Therefore, in particular, when used as a base for flower arrangement, it is possible to comfortably perform the work of making flower arrangements without soiling the hands, clothes, or workroom of the operator during the work of making flower arrangements. Moreover, since the resin foam of the present invention only requires spraying a coating liquid on the outer surface of the resin foam base material, it can be manufactured at a lower cost compared to conventional resin foams dedicated to artificial flowers, and a resin foam with good cost performance can be provided.

[0037] The effect of the present invention of suppressing the generation of fine powder is exhibited when the resin foam is in a dry state. That is, in the conventional resin foam, fine powder was likely to be generated when in a dry state, but in the resin foam of the present invention, almost no fine powder is generated even when in a dry state. Therefore, it is particularly suitable as a resin foam for artificial plants on the premise of being used in a dry state. Also, as a resin foam for fresh flowers on the premise of being used after absorbing water, the generation of fine powder can be suppressed during drying states such as during the manufacture, distribution, and before use of the resin foam where fine powder was generated conventionally, so the effect of the present invention will be exhibited.

[0038] Also, recently, as part of horticultural therapy, cognitive rehabilitation using flower arrangement has also been carried out. For example, in cognitive rehabilitation using flower arrangement, while paying attention to spatial balance, the flower materials are repeatedly inserted and arranged at predetermined locations of the resin foam to improve brain function and the like. Thus, the opportunity to perform flower arrangement is increasing even in the fields of medicine and welfare where a delicate environment is required, but the resin foam of the present invention that can suppress the generation of fine powder can be used comfortably in medical institutions, welfare facilities, educational facilities, etc., so its use in this field is also expected to increase in the future.

[0039] Furthermore, if the coating liquid of the present invention is used for business purposes by florists, flower arrangement operators, etc., the working environment of the operators can be improved. Specifically, if the resin foam is shaped while spraying the coating liquid on the resin foam substrate, the generation of fine powder can be suppressed during the shaping operation of the resin foam and during the subsequent production operation of flower arrangement, and the working environment can be improved. In addition, the coating liquid of the present invention may be applied as a method for suppressing fine powder to other than the resin foam for flower arrangement.

Examples

[0040] The present invention will be described in more detail with reference to the following examples. The materials, amounts used, ratios, treatment details, treatment procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the examples shown below.

[0041] [Test 1] [Preparation of coating solution] [Coating solution A] In a spray container, weakly acidic electrolyzed water (manufactured by Redox Technology Co., Ltd. (distributor: Flower Agri Visionary Japan Co., Ltd.), Clarus Aqua) and sodium carboxymethyl cellulose (manufactured by Marugo Corporation) were added to prepare Coating solution A with a concentration of carboxymethyl cellulose of 1.0%. [Coating solution B] In a spray container, weakly acidic electrolyzed water (manufactured by Redox Technology Co., Ltd. (distributor: Flower Agri Visionary Japan Co., Ltd.), Clarus Aqua) and sodium carboxymethyl cellulose (manufactured by Marugo Corporation) were added to prepare Coating solution B with a concentration of carboxymethyl cellulose of 1.5%.

[0042] [Resin foam] The following foams were used as the resin foam base material. Phenolic resin foam (manufactured by Sumitomo Oasis Japan Co., Ltd., standard) [Shape: approximately cube, surface area: about 329 cm 2 Phenolic resin foam (manufactured by Sumitomo Oasis Japan Co., Ltd., soft) [Shape: approximately cube, surface area: about 329 cm 2 Phenolic resin foam (manufactured by Matsumura Kogyo Co., Ltd., supersoft) [Shape: approximately cube, surface area: about 329 cm 2

[0043] [Examples 1 to 7] ​​​The coating liquid shown in Table 1 below was sprayed onto the upper surface, side surfaces, and bottom surface of the resin foam base material shown in Table 1 below so as to have the mass shown in Table 1 below. Here, in Examples 1 and 4, spraying was performed twice. In both cases, the second spraying was performed 48 hours after the first spraying. Also, for both the first and second sprayings, the upper surface was sprayed 5 times, and the side surfaces and bottom surface were sprayed 3 times. Note that drying after spraying was carried out by natural drying in a room at 25°C. Regarding the measurement of the coating amount, the increase in mass was calculated from the mass of the resin foam base material before spraying and the mass of the resin foam after natural drying in a room at 25°C for 72 hours after the last spraying, and the coating amount was calculated by dividing the increase in mass by the surface area of the resin foam. Also, Examples 1 to 7 were all carried out with two samples, and were shown as "Example 1-1" and "Example 1-2" etc. in Table 1 respectively.

[0044] 〔Comparative Example 1〕 Surface treatment using the coating liquid was not performed, and a phenolic resin foam (manufactured by Sumitomo Shokubai Oasis Japan Co., Ltd., standard) [Shape: approximately cubic, surface area: 329 cm 2 was used as it was for the following evaluation.

[0045] 〔Evaluation〕 Regarding the resin foams after surface treatment of Examples 1 to 7 and the resin foam base material of Comparative Example 1, the presence or absence of fine powder, stickiness, and ease of insertion were evaluated according to the following criteria. The results are shown in Table 1 below. The evaluation was carried out by 5 evaluators. Regarding the "presence or absence of fine powder", the degree to which fine powder adhered was observed by touching the surfaces of the resin foam and the resin foam base material with a dry finger. Regarding "stickiness", the degree of stickiness was observed by touching the surfaces of the resin foam and the resin foam base material with a dry finger. Regarding "ease of insertion", the force required to insert an artificial plant vertically into a resin foam and a resin foam substrate placed on a table to a depth of about 20 mm was compared. Here, an artificial plant having a rod-shaped stem portion with a diameter of about 4 mm and a length of about 100 mm, formed by winding paper clay around a metal core material (diameter of about 1 mm), was used. <Presence or absence of fine powder> 1. When 5 to 4 out of 5 evaluators evaluated that no fine powder adhered to their fingers 2. When 3 to 2 out of 5 evaluators evaluated that no fine powder adhered to their fingers 3. When 1 to 0 out of 5 evaluators evaluated that no fine powder adhered to their fingers, that is, when 4 to 5 evaluators evaluated that fine powder adhered to their fingers <Stickiness> 1. When 5 to 4 out of 5 evaluators evaluated that they did not feel stickiness on their fingers 2. When 3 to 2 out of 5 evaluators evaluated that they did not feel stickiness on their fingers 3. When 1 to 0 out of 5 evaluators evaluated that they did not feel stickiness on their fingers, that is, when 4 to 5 evaluators evaluated that they felt stickiness on their fingers <Ease of insertion> 1. When 5 to 4 out of 5 evaluators evaluated that they could insert it without resistance 2. When 3 to 2 out of 5 evaluators evaluated that they could insert it without resistance 3. When 1 to 0 out of 5 evaluators evaluated that they could insert it without resistance, that is, when 4 to 5 evaluators evaluated that they could not insert it without applying force

[0046] [Table 1]

[0047] From the results shown in Table 1 above, it was found that when at least a part of the surface of the resin foam substrate was coated with carboxymethyl cellulose, generation of fine powder could be suppressed without affecting stickiness and ease of insertion (Examples 1 to 7).

[0048] [Test 2] 〔Preparation of Coating Liquid〕 <Coating Liquid X> In a spray container, weakly acidic electrolyzed water (manufactured by Redox Technology Co., Ltd. (distributor: Flower Agri Visionary Japan Co., Ltd.), Clarus Aqua) and dimethyl silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd., KF-96-350CS) were added to prepare Coating Liquid X with a dimethyl silicone oil concentration of 20%. <Coating Liquid Y> In a spray container, weakly acidic electrolyzed water (manufactured by Redox Technology Co., Ltd. (distributor: Flower Agri Visionary Japan Co., Ltd.), Clarus Aqua) and dimethyl silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd., KF-96-350CS) were added to prepare Coating Liquid Y with a dimethyl silicone oil concentration of 10%. <Coating Liquid A> In a spray container, weakly acidic electrolyzed water (manufactured by Redox Technology Co., Ltd. (distributor: Flower Agri Visionary Japan Co., Ltd.), Clarus Aqua) and carboxymethyl cellulose sodium (manufactured by Marugo Corporation) were added to prepare Coating Liquid A with a carboxymethyl cellulose concentration of 1.0%. <Coating Liquid B> In a spray container, weakly acidic electrolyzed water (manufactured by Redox Technology Co., Ltd. (distributor: Flower Agri Visionary Japan Co., Ltd.), Clarus Aqua) and carboxymethyl cellulose sodium (manufactured by Marugo Corporation) were added to prepare Coating Liquid B with a carboxymethyl cellulose concentration of 1.5%.

[0049] 〔Resin Foam〕 The following foams were used as the resin foam base material. Phenolic resin foam (manufactured by Sumitomo Oasis Japan Co., Ltd., standard) [Shape: approximately cube, surface area: 329 cm 2

[0050] 〔Examples 8 - 14〕 The coating liquid shown in Table 2 below was sprayed onto the upper surface, side surfaces, and bottom surface of the resin foam substrate by spraying. Here, when spraying multiple times as in Examples 9 to 14, spraying was performed after 48 hours had elapsed since the previous spraying. Also, for each spraying of coating liquids X, Y, A, and B, spraying was performed 5 to 7 times. After spraying, drying was carried out by natural drying in a room at 25°C for 72 hours from the last spraying. For Example 8, when the mass of the resin foam substrate before spraying and the mass of the resin foam after natural drying in a room at 25°C for 72 hours from the last spraying were measured, since the increase in mass was 3.11 g, the coating amount was 0.0095 g / cm 2 could be calculated.

[0051] 〔Comparative Example 2〕 Surface treatment using a coating liquid was not performed, and a phenolic resin foam (manufactured by Sumitomo Shoji Oasis Japan Co., Ltd., standard) [shape: approximately cubic, surface area: 329 cm 2 was directly used for the following evaluation.

[0052] 〔Evaluation〕 Regarding the resin foams after surface treatment of Examples 8 to 14 and the resin foam substrate of Comparative Example 2, the presence or absence of fine powder, stickiness, and ease of insertion were evaluated according to the same criteria as in Examples 1 to 7. The results are shown in Table 2 below.

[0053]

Table 2

[0054] From the results shown in Table 2 above, it was found that when at least a part of the surface of the resin foam substrate was coated with silicone oil, generation of fine powder could be suppressed without affecting stickiness and ease of insertion (Examples 8 to 14).

Claims

1. A resin foam for use in cognitive rehabilitation using floral arrangements, comprising: A resin foam, at least a part of the surface of which is covered with a coating material formed by drying a coating liquid applied to the surface of the resin foam substrate, the coating material being formed by applying a coating liquid produced by adding either carboxymethyl cellulose or silicone to weakly acidic electrolyzed water to the surface of the resin foam and drying the coating material.

2. The resin foam according to claim 1, wherein the coating material contains carboxymethyl cellulose, and the coating amount of the carboxymethyl cellulose is 0.0002 to 0.002 g / cm2.

3. The resin foam according to claim 1, wherein the coating material contains silicone oil, and the coating amount of the silicone oil is 0.002 to 0.02 g / cm2.

4. The resin foam according to claim 1 , wherein the resin foam substrate is made of a foam of at least one synthetic resin selected from the group consisting of a phenolic resin, a urethane resin, and polystyrene.

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