JP2020111839A - Temperature sensitive color-changing type molded product and manufacturing method thereof - Google Patents

Abstract

To provide a molded product which a user can visually and enjoyably feel work by a color change of a molded product and in which a temperature sensitive color changing part is not peeled off due to abrasion, bend, expansion/contraction even if it is used for a long term.SOLUTION: In a temperature-sensitive color-changing molded product, a temperature sensitive color-changing part including a temperature sensitive color-changing pigment is formed in at least a part of a substrate in the molded product constituted of a rubber-based material or thermoplastic resin.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a thermosensitive discolorable molded product whose color changes according to a change in temperature and a method for manufacturing the same.

BACKGROUND ART Conventionally, for example, gloves are used in various applications such as cleaning work and gardening work at home and school. In order to perform such work steadily without feeling bothersome, it is effective to make the work feel enjoyable. Therefore, if the glove is provided with a function of changing the color depending on the temperature of a contacting object, the color change can be visually enjoyed while working, and the operator's fatigue can be reduced.

As a method for imparting a temperature-sensitive color-changing function to gloves, a method of manufacturing gloves by weaving or knitting temperature-sensitive color-changing composite fibers has been proposed (Patent Documents 1 and 2). However, textile gloves are not suitable for work involving water and chemicals, and require another technique to impart a temperature display function to the surface of gloves selected from rubber-based substances or thermoplastic resins that are highly waterproof and airtight. there were.

Further, in the case of gloves selected from rubber-based substances or thermoplastic resins, there is known a method of printing a picture or a character on the surface of a general glove using an ink containing a thermochromic pigment ( Patent Document 3). However, the temperature-sensitive color-changing gloves obtained by this method are prone to peeling off due to abrasion, bending, stretching, etc. of the printed temperature-sensitive color-changing part after long-term use, and the color-changing performance gradually deteriorates. There was a problem.

JP-A-4-241115 JP, 2002-138322, A JP, 2000-250390, A

INDUSTRIAL APPLICABILITY The present invention provides a molded product in which the work can be visually enjoyed by the color change of the molded product, and the temperature-sensitive discolored portion does not come off due to abrasion, bending, stretching, etc. even after long-term use. This is an issue.

As a result of intensive studies for solving the above-mentioned problems, the present inventors have found that in a molded product composed of a rubber-based substance or a thermoplastic resin, a temperature-sensitive color changing part is used in at least a part of a substrate by using a temperature-sensitive color changing pigment. It was found that the above-mentioned problems can be solved by forming the above, and the present invention has been completed.

That is, the present invention relates to a temperature-sensitive color changing part containing a temperature-sensitive color-changing pigment, which is formed on at least a part of a base in a molded product composed of a rubber-based substance or a thermoplastic resin. It is a discolored molded product.

Further, the present invention is to treat a mold having a shape of a molded product with a rubber-based substance solution or a thermoplastic resin solution containing a thermochromic pigment to form a film of the thermochromic portion, and to peel it from the mold. And a method for producing a thermosensitive discoloration-molded product.

The temperature-sensitive discolorable molded product of the present invention has high waterproofness and airtightness, and since at least a part of the molded product has a temperature-sensitive discoloring function, it is possible to enjoy changing the color of gloves depending on the temperature of a contact object. In addition, since the temperature-sensitive discolored part is integrated with the molded product, it does not peel off even after repeated wear, bending, and expansion and contraction.

Further, the method for producing a thermosensitive color-changing molded product of the present invention uses a mold shaped a molded product, and treats it with a rubber-based substance solution or a thermoplastic resin solution containing a thermosensitive color-changing pigment, It is possible to manufacture a thermosensitive discolorable molded product in which the thermosensitive discoloring portion is integrated with the molded product.

The thermosensitive color-changing molded product of the present invention (hereinafter referred to as “the product of the present invention”) is a molded product composed of a rubber-based substance or a thermoplastic resin and contains a thermosensitive color-changing pigment in at least a part of the substrate. The temperature-sensitive color changing portion is formed.

The rubber material used in the product of the present invention is not particularly limited, and examples thereof include diene rubber and non-diene rubber. These rubber-based substances may be used alone or in combination of two or more.

Examples of the diene rubber include natural rubber (NR), acrylonitrile-butadiene copolymer (NBR), polychloroprene (CR), polyisoprene (IR), hydrogenated acrylonitrile-butadiene copolymer (HNBR), polybutadiene (NRB). BR), styrene-butadiene copolymer (SBR), styrene-butadiene block copolymer (SBS), hydrogenated styrene-butadiene block copolymer (SEBS), isobutene-isoprene copolymer (IIR), ethylene-propylene -Diene terpolymer (EPDM) and the like. Among these diene rubbers, acrylonitrile-butadiene copolymer (NBR) is preferable because it has excellent physical strength and chemical resistance.

Examples of the non-diene rubber include isobutene-isoprene copolymer (IIR), acrylic rubber (ACM), urethane rubber, silicone rubber, fluororubber (FKM), polyepichlorohydrin (CO), epichlorohydrin. -Ethylene oxide copolymer (ECO), chlorosulfonated polyethylene (CSM) and the like can be mentioned. Among these non-diene rubbers, urethane rubber is preferable because it has excellent physical strength and chemical resistance.

The thermoplastic resin used in the product of the present invention is not particularly limited, and examples thereof include vinyl chloride resin and olefin resin. These thermoplastic resins may be used alone or in combination of two or more.

Examples of the thermoplastic resin include polyethylene, ethylene-vinyl acetate copolymer, polyurethane, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyvinyl acetate, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, polystyrene, acrylic. Resin etc. are mentioned. Among these thermoplastic resins, polyvinyl chloride is preferable because it is easy to mold.

The thermochromic pigment used in the product of the present invention is a pigment whose hue reversibly changes in response to a change in temperature within a certain temperature range, and contains an electron-donating substance, an electron-accepting substance and a medium substance as essential components. And pigments contained in microcapsules formed of melamine resin, urea resin, polyurethane, polyisocyanate, epoxy resin and the like.

An electron-donating substance is a substance that develops a color when it loses an electron by reacting with an electron-accepting substance, and specific examples thereof include fluoranes, fluorenes, diphenylmethanephthalides, diphenylmethaneazaphthalide, and Drill phthalides, phenyl indolyl phthalides, phenyl indolyl azaphthalides, styrylquinolines, diazarhodamine lactones, pyridines, quinazolines, bisquinazolines, ethylenophthalides, etilenoazaphthalides Can be mentioned.

The electron-accepting substance is a substance capable of removing an electron from an electron-donating substance, and specific examples thereof include phenols, metal salts of phenols, bisphenols, aromatic carboxylic acids, and aromatic carboxylic acids. Metal salts of aliphatic carboxylic acids, metal salts of aliphatic carboxylic acids, acidic phosphoric acid esters, metal salts of acidic phosphoric acid esters, triazoles and the like. More specifically, p-cumylphenol, o-phenylphenol, tert-butylphenol, 4-methoxyphenol, p-phenylphenol, p-phenylphenol, phenyl 4-hydroxybenzoate, benzyl 4-hydroxybenzoate, Propyl gallate, 4-[(4-isopropoxyphenyl)sulfonyl]phenol, 4-[(4-propoxyphenyl)sulfonyl]phenol, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis( 4-hydroxyphenyl)propane, 4,4′-dihydroxydiphenylsulfone, 4,4′-(α-methylbenzylidene)bisphenol, 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, 9,9- Examples thereof include bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 4,4′-sulfonylbis[2-(2-propenyl)phenol] and the like.

The medium substance is a substance that serves as a reaction medium for electron transfer between the electron-donating substance and the electron-accepting substance. When the temperature is low, the medium substance is solidified and the electron-donating substance and the electron-accepting substance are bound to each other, and the thermochromic pigment exhibits an arbitrary color. On the other hand, at a high temperature, the medium substance melts, the electron-accepting substance returns electrons to the electron-donating substance, dissociates them from each other, and the thermochromic pigment becomes decolored. Specific examples of the medium substance include aliphatic alcohols, fatty acids, metal salts of fatty acids, fatty acid esters, aliphatic amides, aliphatic ketones, and aliphatic ethers. More specifically, lauric acid, methyl laurate, lauric acid amide, myristic acid, methyl myristate, palmitic acid, methyl palmitate, mistyric acid, myristic acid amide, stearic acid, stearic acid amide, behenic acid, behenic acid. Examples thereof include methyl and behenic acid amide.

Since the color development temperature of the thermochromic pigment is approximately proportional to the melting temperature of the medium substance, it is possible to control the color development temperature of the thermochromic pigment by selecting a medium substance having an appropriate melting temperature. ..

Such thermochromic pigments include, for example, Samal Color series of Recording Materials Research Institute, Thermosensitive dye capsule series of Nippon Capsule Products Co., Ltd., Metamocolor series of Pilot Ink Co., Ltd. The Kuromi Color series of Matsui Pigment Chemicals Industry Co., Ltd. and the TC Color of Sakura Crepas Co., Ltd. are commercially available.

The temperature-sensitive color changing portion of the product of the present invention is composed of a rubber-based substance or a thermoplastic resin containing a temperature-sensitive color changing pigment. The content of the thermochromic pigment in the thermochromic portion is not particularly limited, but is 0.5 to 10 parts by mass, preferably 1 to 8 parts by mass with respect to 100 parts by mass of the rubber-based substance or the thermoplastic resin. Parts by mass. When the content of the thermosensitive color-changing pigment is less than 0.5 part by mass, the temperature-sensitive color changing may be difficult to visually recognize. Further, if the content of the thermochromic pigment exceeds 10 parts by mass, the mechanical strength of the temperature-sensitive color-changing part may decrease.

The type of the temperature-sensitive color-changing pigment in the temperature-sensitive color-changing part of the product of the present invention is not particularly limited, and the color-changing region or color may be appropriately selected according to the intended use.

The temperature-sensitive discoloration part of the product of the present invention may be formed on at least a part of the base of the product of the present invention, and may be a part or the whole of the base or two or more parts. In addition, the temperature-sensitive color changing portion of the product of the present invention may contain not only one type of temperature-sensitive color-changing pigment but also two or more types having different temperature regions. Further, the size and shape of the temperature-sensitive discolored portion of the product of the present invention are not particularly limited, and the size and shape may be appropriately selected according to the intended use.

In addition to the above components, the product of the present invention further comprises a plasticizer, a metal oxide, a vulcanizing agent, a vulcanization accelerator, a filler, an antioxidant, a thickener, an antifungal agent, a fragrance, a pigment, etc. Other components may be included.

The shape of the product of the present invention is not particularly limited as long as it can be molded with a rubber material or a thermoplastic resin, and examples thereof include gloves, boots, waders, swimming hats, balloons and the like. Among these, gloves are preferable, and gloves in which the temperature-sensitive discolored portion is formed on the fingertips are more preferable.

The product of the present invention may be molded using a fibrous substrate. The material of the fibrous substrate is not particularly limited, and examples thereof include cotton, rayon, polyester fiber, acrylic fiber and the like.

In addition, for example, a vinyl chloride thin film layer having fine protrusions may be provided inside the product of the present invention to facilitate the attachment/detachment of gloves, or flocking of piles may be performed. As the surface treatment liquid for forming the vinyl chloride thin film layer having the fine protrusions, for example, those described in JP-A-6-136602 may be used. Further, as a method for planting the pile hair, for example, the method described in JP-A-5-305689 may be used. A functional layer such as a moisturizing layer or an antibacterial layer may be provided on the inside of the product of the present invention by a conventionally known method.

The product of the present invention is obtained by treating a mold in the shape of a molded product with a rubber-based substance solution or a thermoplastic resin solution containing a thermochromic pigment to form a film of the thermochromic part, and peeling it from the mold. It can be manufactured.

The production method of the product of the present invention is to form a film of a temperature-sensitive discoloration part by treating a mold that is a molded product with a rubber-based substance solution or a thermoplastic resin solution containing the above-described temperature-sensitive discoloration pigment. Other than the above, a conventionally known method for producing a molded product can be used. The rubber substance solution containing the thermochromic pigment is a mixture of the above-mentioned latex of the rubber substance, the thermochromic pigment, and optionally other components. The thermoplastic resin solution containing the thermochromic pigment is a mixture of the sol of the above-mentioned thermoplastic resin, the thermochromic pigment and, if necessary, other components. A method for forming a film of a temperature-sensitive color changing part by treating a mold that models a molded product with a rubber-based substance solution or a thermoplastic resin solution containing these temperature-sensitive color-changing pigments is also a conventionally known method for producing a molded product. Is available.

Preferred examples of the method for producing the product of the present invention include the following (1) and (2). According to these manufacturing methods, the product of the present invention in which the temperature-sensitive discolored portion is integrated with the molded product can be manufactured.
(1) A mold having a shape of a molded product is treated with a first rubber-based substance solution or a thermoplastic resin solution containing a thermochromic pigment to form a film of a thermochromic portion on at least a part of the mold. Then
Then, this is treated with a second rubber-based material solution or a thermoplastic resin solution to form a film on the entire surface of the mold,
Finally, a method for producing a thermosensitive discoloring molded product in which the mold is reversed and peeled.
(2) A fibrous substrate is covered on a mold of a molded product, and the fibrous substrate is treated with a rubber substance solution or a thermoplastic resin solution containing a thermochromic pigment, and at least a part of the fibrous substrate is thermochromically discolored. Part of the film is formed,
Finally, a method for producing a thermosensitive discoloration-molded product that is peeled from the mold.

In the manufacturing method of (1), a mold shaped as a molded product is treated with a first rubber-based substance solution containing a thermochromic pigment (hereinafter, simply referred to as “first rubber-based substance solution”). The method for forming the film of the temperature-sensitive discoloration portion on at least a part of the mold is not particularly limited, for example, a desired location of the mold shaped molded product is immersed in the first rubber-based substance solution, and pulled up, A method of heating and drying the first rubber-based material that has adhered to the surface of the mold, or spraying and applying the first rubber-based material solution to the desired location of the mold that is a molded product, and then adhering it to the surface of the mold. The method of heating and drying the above-mentioned first rubber-based substance may be mentioned. Further, the thickness of the coating film of the rubber-based substance can be adjusted by the mold temperature, the drying temperature, the drying time, the vulcanization temperature, the vulcanization time and the like. The first rubber-based substance solution is a mixture of the above-mentioned rubber-based substance latex, a thermochromic pigment, and optionally other components.

As described above, the coating of the temperature-sensitive color changing portion containing the temperature-sensitive color changing pigment can be formed on at least a part of the mold. This is then treated with a second rubber-based material solution to form a coating over the mold.

The second rubber-based material solution is a mixture of the above-mentioned rubber-based material latex, if necessary, with other components. The type of rubber-based material may be the same as or different from that used in the first rubber-based material solution.

The method of forming a coating film on the entire mold by treatment with the second rubber-based material solution is not particularly limited, and for example, at least a part of the mold may have a temperature-sensitive color changing portion containing a temperature-sensitive color changing pigment. A method in which the mold on which the coating is formed is immersed in a second rubber-based substance solution, pulled up, and the second rubber-based substance adhered to the surface of the mold is heated and dried, or at least a part of the mold, The second rubber substance solution is sprayed and applied to the mold on which the film of the temperature-sensitive color changing part containing the temperature-sensitive color changing pigment is formed, and the second rubber substance attached to the surface of the mold is heated and dried. And the like. Further, the thickness of the coating film of the rubber-based substance can be adjusted by the mold temperature, the drying temperature, the drying time, the vulcanization temperature, the vulcanization time and the like. Finally, the product of the present invention is obtained by reverse peeling from the mold.

Further, in the manufacturing method of (1), a mold having a shape of a molded product is treated with a first thermoplastic resin solution containing a thermochromic pigment (hereinafter, simply referred to as “first thermoplastic resin solution”). The method of forming a film of the temperature-sensitive discoloration portion on at least a part of the mold is not particularly limited, and for example, a desired location of the mold that is a molded product is immersed in the first thermoplastic resin solution. , Pulling up, a method of heating and drying the first thermoplastic resin adhered to the surface of the mold, or spraying and applying the first thermoplastic resin solution to a desired location of the mold which is a molded product, Examples thereof include a method of heating and drying the first thermoplastic resin attached to the surface. Further, the thickness of the coating film of the thermoplastic resin can be adjusted by the mold temperature, the heating temperature, the heating time and the like. The first thermoplastic resin solution is a mixture of the above-mentioned thermoplastic resin sol, a thermochromic pigment, and optionally other components.

As described above, the coating of the temperature-sensitive color changing portion containing the temperature-sensitive color changing pigment can be formed on at least a part of the mold. This is then treated with a second thermoplastic resin solution to form a coating over the mold.

The second thermoplastic resin solution is obtained by mixing the above-mentioned thermoplastic resin sol with other components as necessary. The type of thermoplastic resin may be the same as or different from that used in the first thermoplastic resin solution.

The method of forming a coating film on the entire mold by treatment with the second thermoplastic resin solution is not particularly limited, for example, at least a part of the mold, of the temperature-sensitive color changing portion containing a temperature-sensitive color changing pigment. The mold with the coating formed is immersed in a second thermoplastic resin solution, pulled up, and a method of heating and solidifying the second thermoplastic resin attached to the surface of the mold, or at least a part of the mold, The second thermoplastic resin solution is sprayed and applied to the mold on which the film of the temperature-sensitive color-changing part containing the temperature-sensitive color-changing pigment is formed, and the second thermoplastic resin adhering to the surface of the mold is heated and solidified. And the like. Further, the thickness of the coating film of the thermoplastic resin can be adjusted by the mold temperature, the heating temperature, the heating time and the like. Finally, the product of the present invention is obtained by reverse peeling from the mold.

In the manufacturing method of (2), at least one of the fibrous substrates is covered by covering a mold having a shape of a molded product with a fibrous substrate and treating the mold with a rubber substance solution or a thermoplastic resin solution containing a thermochromic pigment. There is no particular limitation on the method for forming the film of the temperature-sensitive color changing portion on the part. For example, first, the mold is covered with a fibrous base material, and the fibrous base material is covered with the temperature-sensitive color changing pigment. Examples include a method of forming a film of the temperature-sensitive discolored portion on at least a part of the fibrous substrate by treatment with the first rubber-based substance solution or the first thermoplastic resin solution and performing the same as in the production method (1). To be In this production method, before the fibrous substrate is treated with the rubber-based substance solution containing the thermochromic pigment or the thermoplastic resin solution containing the thermochromic pigment, the production method of (1) The coating of the rubber-based material or the thermoplastic resin may be formed on the entire fibrous substrate by treating with the second rubber-based material solution or the second thermoplastic resin solution. Finally, the product of the present invention is obtained by peeling from the mold.

The product of the present invention thus obtained can visually enjoy the work due to the color change of the molded product, and even when used for a long period of time, the temperature-sensitive discolored portion peels off due to wear, bending, stretching, etc. There is nothing.

Therefore, the product of the present invention can be used in fields such as nursing care, cooking, fisheries, agriculture and cleaning. Specifically, if the product of the present invention is a glove and the temperature-sensitive discolored part changes color at 40° C., the water temperature can be confirmed while wearing the glove, which is particularly useful in nursing care sites, cooking sites, and cleaning sites. is there.

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.

Example 1
Fabrication of gloves:
(Preparation of polyvinyl chloride sol)
100 parts by mass of polyvinyl chloride (trade name "PSM-30" manufactured by Tosoh Corporation), 100 parts by mass of plasticizer (trade name "Mesamoll" manufactured by LANXESS), epoxidized soybean oil (Brand name "Adeka Sizer (registered trademark) O-130P", manufactured by ADEKA Co., Ltd.) 5 parts by mass, viscosity modifier (Brand name "Roseal QS-102", manufactured by Tokuyama Co., Ltd.) 5 parts by mass, titanium dioxide Polyvinyl chloride sol A was produced by mixing and stirring 3 parts by mass (manufactured by Ishihara Sangyo Co., Ltd.).

Separately, 100 parts by mass of polyvinyl chloride (trade name "PSM-30" manufactured by Tosoh Corporation), 100 parts by mass of plasticizer (trade name "Mesamoll" manufactured by LANXESS), and epoxidized 5 parts by mass of soybean oil (trade name "Adeka Sizer O-130P", manufactured by ADEKA Co., Ltd.), 2 parts by mass of viscosity modifier (trade name "Leosir QS-102", manufactured by Tokuyama Co., Ltd.), thermochromic pigment (Product name "Thermal Color (registered trademark) OR-40 (blue, erasing start temperature 35°C, erasing completion temperature 45°C)", manufactured by Recording Materials Research Institute, Inc.) 5 parts by mass are mixed and stirred. , Polyvinyl chloride sol B was prepared.

(Preparation of surface treatment liquid)
Polyvinyl chloride (trade name "C-38", manufactured by Tosoh Corporation) 100 parts by mass, ion-exchanged water 400 parts by mass, surfactant (trade name "GWIS-120", manufactured by Nippon Emulsion Co., Ltd.) 4 parts by mass Parts and a stabilizer (trade name "ADEKA STAB (registered trademark) SC-35", manufactured by ADEKA CORPORATION) were mixed and stirred to prepare a surface treatment liquid.

(Production of gloves made of thermoplastic resin)
Only the finger part of the ceramic hand mold preheated to a surface temperature of 60°C is immersed in polyvinyl chloride sol B, heated at 200°C for 3 minutes, and then allowed to cool to a surface temperature of 60°C. did. Next, the entire ceramic hand mold in which polyvinyl chloride sol B was attached to the finger portion was immersed in polyvinyl chloride sol A and heated at 200° C. for 3 minutes. Further, after immersing in the surface treatment liquid, heating at 200° C. for 5 minutes and allowing to cool, the coating was peeled off while being inverted from the hand mold, to produce a thermoplastic resin glove. When this glove made of thermoplastic resin was dipped in hot water at 45° C., it was confirmed that the blue part of the finger disappeared and that it had a temperature-sensitive discoloration function.

Example 2
Fabrication of gloves:
(Preparation of rubber material solution)
The following compounding amounts are apparent masses including water. To 100 parts by mass of NBR latex (brand name "LX550", manufactured by Nippon Zeon Co., Ltd.) having a solid content of 45% by mass, 1 part of zinc oxide (brand name "Zinc Hua 2", manufactured by Sakai Chemical Industry Co., Ltd.) 1 Parts by mass, zinc di-n-butyldithiocarbamate (trade name "NOXCELLER (registered trademark) BZ", manufactured by Ouchi Shinko Chemical Co., Ltd.) 0.3 parts by mass, sulfur (manufactured by Nacalai Tesque, Inc.) 5 parts by mass, casein (manufactured by Nacalai Tesque, Inc.) 0.3 parts by mass, ammonia water with a concentration of 28% (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.) 0.8 parts by mass, anionic surfactant (trade name) "Emar (registered trademark) 10", manufactured by Kao Corporation) 0.1 part by mass, potassium hydroxide 0.3 part by mass, 2 parts by mass of titanium dioxide aqueous dispersion having a solid content of 50% by mass, a thermochromic pigment. 5 parts by mass (trade name "Thermal Color OR-40 (blue)", manufactured by Recording Materials Research Institute, Inc.) and 70 parts by mass of ion-exchanged water were mixed to prepare a rubber-based substance solution.

(Preparation of surface treatment liquid)
The following compounding amounts are apparent masses including water. 5 parts by mass of polyacrylonitrile crosslinked particles (trade name "Toughtic A20", manufactured by Toyobo Co., Ltd.) were mixed with 100 parts by mass of an acrylic resin emulsion having a solid content of 10% by mass to prepare a surface treatment liquid.

(Production of gloves made of rubber material)
The ceramic hand mold was placed in a gear oven controlled at 100°C and heated until the surface temperature reached 55°C. The heated ceramic hand mold was immersed in a 30 mass% aqueous solution of calcium nitrate and dried at 100° C. for 1 minute. Next, the whole hand mold is dipped in the rubber substance solution for 3 minutes, dried at 100° C. for 2 minutes, then soaked in ion-exchanged water for 8 minutes, and again dried at 100° C. for 1 minute and 30 seconds to obtain a hand. A rubber-based material coating was formed on the surface of the mold. Further, the hand mold was dipped in the surface treatment solution for 2 minutes, dried at 100° C. for 1 minute and 30 seconds, and peeled from the hand mold while inverting the coating film to produce a rubber-type glove. When this glove made of rubber-based material was dipped in hot water at 45° C., it was confirmed that the part in contact with the hot water disappeared from the blue color and that it had a temperature-sensitive discoloration function.

Example 3
Fabrication of gloves:
(Preparation of rubber material solution)
The following compounding amounts are apparent masses including water. To 100 parts by mass of NBR latex (brand name "LX550", manufactured by Nippon Zeon Co., Ltd.) having a solid content of 45% by mass, 1 part of zinc oxide (brand name "Zinc Hua 2", manufactured by Sakai Chemical Industry Co., Ltd.) 1 Parts by mass, zinc di-n-butyldithiocarbamate (trade name "NOXCELLER BZ", manufactured by Ouchi Shinko Chemical Industry Co., Ltd.) 0.3 parts by mass, sulfur (manufactured by Nacalai Tesque Co., Ltd.) 0.5 parts by mass, 0.3 parts by mass of casein (manufactured by Nacalai Tesque, Inc.), 0.8 parts by mass of ammonia water having a concentration of 28% (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.), anionic surfactant (trade name "Emar 10") , Kao Co., Ltd. 0.1 parts by mass, potassium hydroxide 0.3 parts by mass, 2 parts by mass of titanium dioxide aqueous dispersion having a solid content of 50% by mass, a thermochromic pigment (trade name “Thermal Color OR- 40 (blue)", manufactured by Recording Materials Research Institute, Inc.) and 5 parts by mass of ion-exchanged water were mixed to prepare a rubber-based substance solution.

(Preparation of gloves made of rubber material with lining cloth)
A metal hand mold was covered with a knitted fabric, immersed in a 30% by mass aqueous solution of calcium nitrate, and dried at 100° C. for 1 minute. Then, the whole mold covered with the knitted fabric is immersed in a rubber substance solution for 1 minute, dried at 100° C. for 2 minutes, immersed in ion-exchanged water for 8 minutes, and dried again at 100° C. for 1 minute 30 seconds. A rubber-based material coating was formed on the surface of the mold covered with the knitted fabric. Then, it was peeled from the mold to produce a rubber-made glove with a back cloth. When this rubber glove with a backing cloth was dipped in hot water at 45° C., the blue color of the part in contact with the hot water disappeared, and it was confirmed that the gloves had a temperature-sensitive discoloration function.

Example 4
Use in care settings:
Bathing care was performed with the gloves of Example 2. Up to now, the bath temperature was checked with a thermometer or the like before bathing, but since the gloves of Example 2 were used, it was possible to check the bath temperature as it was, saving labor. ..

The product of the present invention can be used in fields such as nursing care, fishing, agriculture and cleaning.

Claims (9)

A thermosensitive color-changing molded product, characterized in that a thermosensitive color-changing part containing a temperature-sensitive color-changing pigment is formed on at least a part of a base in a molded product composed of a rubber-based substance or a thermoplastic resin. The thermosensitive discolorable molded product according to claim 1, wherein the rubber-based substance is selected from a diene-based rubber and a non-diene-based rubber. The thermochromic molded product according to claim 1, wherein the thermoplastic resin is selected from vinyl chloride resin and polyolefin resin. The temperature-sensitive discolorable molded product according to claim 1, wherein the molded product is a glove. The temperature-sensitive discoloring molded product according to claim 4, wherein the temperature-sensitive discoloring portion is a fingertip. A temperature-sensitive feature characterized by forming a film of a thermosensitive color-changing pigment by treating a mold, which is a molded product, with a rubber-based substance solution or a thermoplastic resin solution containing a temperature-sensitive color-changing pigment, and peeling it from the mold. Method for manufacturing discolored molded products. A mold shaped into a molded product is treated with a first rubber-based substance solution containing a thermochromic pigment to form a film of a thermochromic portion on at least a part of the mold,
Then, this is treated with a second rubber-based material solution to form a coating on the entire mold,
Finally, a method for producing a thermosensitive discoloration-molded product, which comprises reversing and peeling from a mold. A mold having a shape of a molded product is treated with a first thermoplastic resin solution containing a thermochromic pigment to form a film of the thermochromic portion on at least a part of the mold,
Then, this is treated with a second thermoplastic resin solution to form a coating on the entire mold,
Finally, a method for producing a thermosensitive discoloration-molded product, which comprises reversing and peeling from a mold. A fibrous substrate is placed on a mold of a molded product, and the fibrous substrate is treated with a rubber substance solution or a thermoplastic resin solution containing a thermochromic pigment to form a film of the thermochromic portion on at least a part of the fibrous substrate. To form
Finally, a method for producing a temperature-sensitive discoloration-molded product characterized by peeling from a mold.