Adaptive temperature control of smart care diapers

Abstract

The application discloses a self-adaptive temperature control intelligent nursing diaper and relates to the technical field of sanitary products. The self-adaptive temperature control intelligent nursing diaper comprises, from inside to outside, an absorption core layer, a heat-conducting fiber layer and a waterproof film, wherein the waterproof film is provided with a plurality of air holes, and the inner side of the waterproof film is attached with a heat-induced shape change polymer film. The heat-induced shape change polymer film shrinks when the temperature is higher than the phase transition temperature, so as to reduce the shielding area of the air holes of the waterproof film. The heat-induced shape change polymer film expands when the temperature is lower than the phase transition temperature, so as to increase the shielding area of the air holes of the waterproof film. The technical scheme realizes self-adaptive temperature control of the diaper.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sanitary products, in particular to a self-adaptive temperature control intelligent nursing diaper. BACKGROUND

[0002] The paper diaper is a disposable sanitary product designed for babies or adults, which has the characteristics of convenient replacement, hygiene and strong absorption.

[0003] The air permeability of the paper diaper at different temperatures has an important influence on the wearing comfort. If the air permeability is not good, the high-temperature and humid environment in the paper diaper will not only increase the discomfort, but also cause the breeding of bacteria and fungi due to the long-term residence of harmful substances in the urine, which will not only stimulate the skin, but also increase the risk of urinary system infection. At the same time, the paper diaper also needs certain warmth performance to avoid the wearer from getting cold. Therefore, how to self-adaptively control the temperature of the paper diaper has become a problem to be solved for high-end paper diapers. At present, some paper diaper products use temperature-sensitive color developing materials to monitor the temperature, but lack of active temperature control or automatic adjustment function. A few paper diapers with temperature control function mostly use metal or electronic components, which have safety hazards and high cost problems, and the wearing comfort is also poor. SUMMARY

[0004] The present application provides a self-adaptive temperature control intelligent nursing diaper, which aims to realize the self-adaptive adjustment function of the paper diaper heat dissipation / heat preservation through the environmental response material.

[0005] The self-adaptive temperature control intelligent nursing diaper provided by the present application comprises an absorption core layer, a heat-conducting fiber layer and a waterproof film arranged in sequence from inside to outside, and the waterproof film is provided with a plurality of air holes.

[0006] The inner side of the waterproof film is attached with a heat-induced deformation polymer film. The heat-induced deformation polymer film shrinks when the temperature is higher than the phase transition temperature, so as to reduce the shielding area of the air holes of the waterproof film. The heat-induced deformation polymer film expands when the temperature is lower than the phase transition temperature, so as to increase the shielding area of the air holes of the waterproof film.

[0007] Optionally, the density of the air holes of the waterproof film is 50-120 per cm 3 ;

[0008] Among them, the air hole diameter of the air hole located in the front part of the waterproof film is 20-30 microns, and the air hole diameter of the air hole located in the rear part of the waterproof film is 5-10 microns.

[0009] Optionally, the inner wall of the air hole is coated with a super-hydrophobic coating.

[0010] Optionally, the super-hydrophobic coating is polydimethylsiloxane.

[0011] Optionally, the thermally induced deformation polymer film has a shrinkage rate of greater than or equal to 30% when the temperature is higher than the phase transition temperature, and an expansion rate of greater than or equal to 20% when the temperature is lower than the phase transition temperature.

[0012] Optionally, the thermally induced deformation polymer film has a phase transition temperature of 25-30 DEG C.

[0013] Optionally, the thermally induced deformation polymer film is made of poly N-isopropyl acrylamide / polyethylene glycol copolymer.

[0014] Optionally, the absorbent core layer contains phase change energy storage material, and the phase change energy storage material has a phase transition temperature of 30-36 DEG C; the phase change energy storage material absorbs heat when the temperature is higher than the phase transition temperature, and releases heat when the temperature is lower than the phase transition temperature.

[0015] Optionally, the phase change energy storage material is modified palm wax microcapsule.

[0016] Optionally, the proportion of the modified palm wax microcapsule in the absorbent core layer is 10wt%.

[0017] Optionally, the thermal conductivity of the thermal conductive fiber layer is greater than or equal to 0.9 W / m*K.

[0018] Optionally, the thermal conductive fiber layer is made of polyester fiber and graphene coating fiber.

[0019] Optionally, the thermal conductive fiber layer contains 85wt% polyester fiber and 15wt% graphene coating fiber.

[0020] Optionally, the outer side of the waterproof film is coated with temperature-sensitive color-changing ink.

[0021] The temperature-sensitive color-changing ink contains a resin base material, and thermochromic microcapsules, nano boron nitride and a fluorescence enhancer dispersed in the resin base material.

[0022] Optionally, the thermochromic microcapsules contain crystal violet lactone.

[0023] Optionally, the fluorescence enhancer is a rare earth complex Eu(TTA)3.

[0024] Optionally, the mass proportions of the resin base material, thermochromic microcapsules, nano boron nitride and fluorescence enhancer are 55%, 30%, 10% and 5%, respectively.

[0025] Optionally, the inner side of the intelligent diaper further comprises a non-woven fabric layer, and the intelligent diaper comprises, from inside to outside, the non-woven fabric layer, the absorbent core layer, the thermal conductive fiber layer and the waterproof film.

[0026] The present application has the following advantages:

[0027] The waterproof film is provided with a plurality of air holes, and a heat-induced deformation polymer film is attached to the inner side of the waterproof film. When the temperature is higher than the phase transition temperature, the heat-induced deformation polymer film shrinks to reduce the shielding area of the air holes of the waterproof film, thereby improving the air permeability and heat dissipation performance of the diaper, and the diaper enters a heat dissipation mode. When the temperature is lower than the phase transition temperature, the heat-induced deformation polymer film expands to increase the shielding area of the air holes of the waterproof film, thereby improving the heat preservation capacity of the diaper, reducing heat loss at the wearing position, and the diaper enters a heat preservation mode. The heat-induced deformation polymer film automatically adjusts the shielding area of the air holes of the waterproof film, thereby realizing self-adaptive temperature regulation of the diaper. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 A schematic diagram of the laminated structure of some embodiments of the self-adaptive temperature control intelligent care diaper of the present application;

[0030] Figure 2 One of the principle schematic diagrams for realizing self-adaptive adjustment of diaper heat dissipation / heat preservation in some embodiments of the self-adaptive temperature control intelligent care diaper of the present application through a TRP film (cross-sectional schematic diagram);

[0031] Figure 3 One of the principle schematic diagrams for realizing self-adaptive adjustment of diaper heat dissipation / heat preservation in some embodiments of the self-adaptive temperature control intelligent care diaper of the present application through a TRP film (cross-sectional schematic diagram);

[0032] Figure 4 A schematic diagram of the color change of the temperature-sensitive color-changing ink at different temperatures in some embodiments of the present application.

[0033] Explanation of reference signs:

[0034] 1, absorbent core layer; 2, heat-conducting fiber layer; 3, TRP film; 4, waterproof film; 4-1, air hole; 5, temperature-sensitive color-changing ink. DETAILED DESCRIPTION

[0035] In order to make the application purposes, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings of the embodiments of the present application. Obviously, the following described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] The adaptive temperature control intelligent care diaper provided in the embodiments of the present application aims to realize the adaptive adjustment function of the diaper heat dissipation / heat preservation through the environmental response material.

[0037] Referring to Figure 1 and Figure 2 In the embodiments of the present application, the adaptive temperature control intelligent care diaper comprises, from inside to outside, an absorption core layer 1, a heat-conducting fiber layer 2 and a waterproof film 4.

[0038] The waterproof film 4 is used to prevent urine from leaking outside the diaper, and a plurality of air permeation holes 4-1 are densely distributed on the waterproof film 4.

[0039] In the embodiments of the present application, the material of the waterproof film includes, but is not limited to, one or a combination of more than one of polypropylene (PP), polyethylene (PE), thermoplastic polyurethane (TPU), polylactic acid (PLA) and other polymer films and their derivatives; in some preferable embodiments, the waterproof film can be made of TPU material, which has excellent elasticity and is environmentally friendly and biodegradable.

[0040] In some embodiments, the density of the air permeation holes on the waterproof film is 50-120 per cm 3 , the air permeation hole diameter on the front part of the waterproof film is 20-30 pm, and the air permeation hole diameter on the rear part of the waterproof film is 5-10 pm.

[0041] The front part of the waterproof film refers to the part close to the abdomen when the diaper is worn on the user, and the rear part of the waterproof film refers to the part close to the buttocks; the larger air permeation hole diameter on the front part of the waterproof film is beneficial to rapid heat dissipation, and the smaller air permeation hole diameter on the rear part is beneficial to balancing the effects of heat dissipation and heat preservation.

[0042] In some embodiments, the inner wall of the air permeation hole on the waterproof film is coated with a hydrophobic coating to prevent urine from leaking through the air permeation holes; the material of the hydrophobic coating can be selected from, but is not limited to, dimethyl polysiloxane (PDMS), polymethylphenylsiloxane (PMPS) and other organosilicon derivatives, fluorosiloxane copolymer, polyacrylate hydrophobic modification material, natural hydrophobic materials such as beeswax / plant wax, etc.

[0043] In some preferred embodiments, the inner wall of the hole of the air hole is coated with polydimethylsiloxane (PDMS), and the surface contact angle of the PDMS coating is greater than 150℃, which can effectively prevent urine leakage.

[0044] In the embodiments of the present application, the absorbent core layer comprises superabsorbent polymer (SAP), which is used to efficiently absorb urine; the superabsorbent polymer comprises, but is not limited to, a combination of one or more of polyacrylate (such as sodium polyacrylate, modified polyacrylate), starch-based polymer (such as starch-acrylic acid graft copolymer, starch-acrylonitrile hydrolysate), cellulose-based polymer (such as carboxymethyl cellulose and its derivatives, cellulose graft copolymer), polyvinyl alcohol, natural polymer composite (such as sodium alginate, chitosan, pectin, etc. and the composite material composed of the polymer skeleton), and the like.

[0045] In the embodiments of the present application, the heat-conducting layer located between the absorbent core layer and the waterproof film is used to conduct heat, and needs to have high efficient heat conduction, soft skin-friendly, liquid penetration resistance and mechanical stability, and at the same time needs to be compatible with the absorbent core layer and the waterproof film; the material of the heat-conducting layer can be selected from one or more of a combination of polyester fiber-based composite material, polyamide-based composite material, natural fiber heat-conducting material (such as bamboo fiber, hemp fiber, silk protein, etc.), inorganic non-metal heat-conducting material (such as carbon fiber non-woven fabric, aerogel coating fiber, carbon coating fiber).

[0046] In some preferred embodiments, the heat-conducting fiber layer is made of polyester fiber and graphene coating fiber; the polyester fiber forms the skeleton support structure of the heat-conducting fiber layer, and the graphene coating fiber has high heat conduction and forms a heat-conducting path; the polyester fiber and graphene coating fiber composite material prepared by the blending process has the advantages of high heat conduction, light weight and softness.

[0047] In some specific embodiments, the heat-conducting fiber layer is made of 85% polyester fiber and 15% graphene coating fiber by mass fraction, and the overall thermal conductivity of the heat-conducting fiber layer is ≥0.9 W / m·K.

[0048] In some embodiments, the inner side of the paper diaper is further provided with a non-woven fabric layer, and the self-adaptive temperature control intelligent protection paper diaper comprises, from inside to outside, a non-woven fabric layer, an absorbent core layer, a heat-conducting fiber layer and a waterproof film; the non-woven fabric layer usually adopts hydrophilic non-woven fabric, and when the paper diaper is worn, the non-woven fabric layer is located between the skin of the wearer and the absorbent core layer of the paper diaper, which is used to quickly absorb and conduct urine, and at the same time prevents the materials in the absorbent core layer from directly rubbing the skin and prevents the urine in the absorbent core layer from seeping back to the skin.

[0049] Based on the above embodiments, the first aspect of the present application uses a heat-induced deformation polymer film to realize self-adaptive adjustment of heat dissipation / heat preservation of the paper diaper.

[0050] Specifically, refer to Figure 1 In the embodiments of the present application, the inner side of the waterproof film 4 is attached with a thermally induced deformation polymer (TRP) film 3; refer to Figure 2 and Figure 3 The TRP film 3 shrinks when the temperature is higher than the phase transition temperature to reduce the shielding area of the air permeable holes 4-1 of the waterproof film 4; and the TRP film 3 expands when the temperature is lower than the phase transition temperature to increase the shielding area of the air permeable holes 4-1 of the waterproof film 4.

[0051] In the embodiments of the present application, the shielding area of the TRP film to the air permeable holes can be quantified by the number of air permeable holes being shielded; the number, shape and arrangement of the TRP film are not particularly limited, a plurality of TRP films in regular or irregular arrangement can be attached to the inner side surface of the waterproof film, and the shape of the TRP film can be selected from one or more of various shapes such as circular, square, triangular, regular hexagonal, etc.; the overall air permeation effect of the waterproof film + TRP film can be described by the states of air duct closed, half-opened and fully opened, and the "air duct" refers to the gas flow channel formed by the air permeable holes; for example Figure 2 and Figure 3 The waterproof film 4 shown in the above formula has an array of air permeable holes arranged uniformly and with the same hole diameter, when the temperature is relatively low, the TRP film expands to shield a relatively large number of air permeable holes, which can be defined as the air duct closed state, and the diaper enters the heat preservation mode; when the temperature is relatively comfortable, the expansion rate or shrinkage rate of the TRP film is relatively low, and only a general number of air permeable holes are shielded, which can be defined as the air duct half-opened state, and the diaper enters the heat dissipation / heat preservation balanced mode; when the temperature is relatively high, the TRP film shrinks, and most of the air permeable holes are not shielded, which can be defined as the air duct fully opened state, and the diaper enters the heat dissipation mode.

[0052] The material of the TRP film includes but is not limited to poly-N-isopropyl acrylamide (PNIPAM), poly-N-isopropyl methacrylamide (PNIPMAM), polyethylene glycol dimethacrylate (POEGMA), poly-N-n-propyl acrylamide (PNNPAM), poly-N-vinyl caprolactam (PVca) and other thermally induced deformation polymers with a temperature response range of 15-50℃, which have reversible and adjustable phase transition of volume expansion or shrinkage near the phase transition temperature.

[0053] In some embodiments, the shrinkage rate of the TRP film is ≥30% when the temperature is higher than the phase transition temperature, and the expansion rate is ≥20% when the temperature is lower than the phase transition temperature, so as to effectively reduce or increase the shielding area of the air permeable holes of the waterproof film.

[0054] In some embodiments, the phase transition temperature of the TRP film is 25-30℃.

[0055] In some preferable embodiments, the TRP film is made of poly (N-isopropylacrylamide) (PNIPAM) / polyethylene glycol) (PEG) copolymer.

[0056] The PNIPAM / PEG copolymer is a block copolymer composed of PNIPAM and PEG, and the lower critical solution temperature (LCST) of the PNIPAM is about 32℃, which is close to the human body temperature; the groups in the PNIPAM molecule exhibit hydrophilicity when the temperature is lower than the LCST, the molecular chain segments are in an extended state in a water environment (such as urine immersion), and the macroscopic performance is volume expansion; when the temperature is higher than the LCST, the groups in the PNIPAM molecule exhibit hydrophobicity, the molecular chain segments are contracted in a water environment, and the macroscopic performance is volume contraction; the introduction of PEG can adjust the phase transition temperature of PNIPAM to a suitable value, and PEG has better biocompatibility and flexibility than PNIPAM, and the copolymer formed by combining the two has both the temperature sensitivity of PNIPAM and the excellent properties of PEG.

[0057] In some preferable embodiments, the mass ratio of PNIPAM to PEG in the PNIPAM / PEG copolymer is 7:3, and the phase transition temperature of the copolymer is about 28℃.

[0058] In the embodiment of the present application, the heat-induced deformation polymer film is attached to the inner side of the waterproof film, and the heat-induced deformation polymer film shrinks when the temperature is high, thereby reducing the shielding area of the air permeable hole on the waterproof film, improving the air permeability and heat dissipation performance of the diaper, and enabling the diaper to enter the heat dissipation mode; the heat-induced deformation polymer film expands when the temperature is low, thereby increasing the shielding area of the air permeable hole on the waterproof film and reducing heat dissipation, and enabling the diaper to enter the heat preservation mode; the heat-induced deformation polymer film automatically adjusts the shielding area of the air permeable hole on the waterproof film, thereby realizing the self-adaptive temperature regulation of the diaper.

[0059] The second aspect of the present application realizes the self-adaptive adjustment of the heat dissipation / heat preservation of the diaper by using the phase change energy storage material.

[0060] Specifically, in the embodiment of the present application, the phase change energy storage material is dispersed in the absorbent core layer, and the phase transition temperature of the phase change energy storage material is 30-36℃; the phase change energy storage material absorbs heat when the temperature is higher than the phase transition temperature, and releases heat when the temperature is lower than the phase transition temperature.

[0061] The types of the phase change energy storage material that can be used in the embodiment of the present application include but are not limited to fatty acids (such as capric acid, lauric acid, myristic acid, etc.) and their derivatives, polyethylene glycol and its complex / derivatives, polyolefins (such as ethylene-vinyl acetate copolymer), natural phase change energy storage materials, etc.

[0062] In some preferable embodiments, the phase change energy storage material is modified palm wax microcapsule; the palm wax is a natural wax extracted from palm fruit, and the main components are fatty acid esters, free fatty acids, sterols, etc. By compounding a low-melting-point component (such as capric acid) and a microencapsulation process, the phase change temperature (melting point) of the obtained modified palm wax microcapsule is reduced to the range of 30-36℃, which can meet the phase change energy storage requirements of the diaper.

[0063] In some preferable embodiments, the particle size of the modified palm wax microcapsule is 215μm, and the coating rate is ≥98%.

[0064] In some more preferable embodiments, the phase change temperature of the modified palm wax microcapsule is 33-35℃, the coating rate is 99%, and the modified palm wax microcapsule is mixed into the superabsorbent polymer in the absorption core layer, accounting for 10wt%.

[0065] The modified palm wax microcapsule used in the above embodiments is biodegradable, with a biodegradation rate ≥90%, meeting the high-standard environmental protection requirements, and is non-toxic and stable.

[0066] The third aspect of the present application uses temperature-sensitive color-changing ink to realize the temperature color-changing prompt and heat dissipation / heat preservation self-adaptive adjustment linkage of the diaper, and realizes visual temperature control response.

[0067] Specifically, in the embodiment of the present application, the outer side of the waterproof film is coated with temperature-sensitive color-changing ink, and the temperature-sensitive color-changing ink comprises a resin base material and heat-induced color-changing microcapsules, nano boron nitride and a fluorescence enhancer dispersed in the resin base material.

[0068] The heat-induced color-changing microcapsule is formed by wrapping the heat-induced color-changing material (such as organic dye) in a small shell (such as polymer wall material) through microcapsule technology, and the core is that the heat-induced color-changing material in the capsule is sensitive to temperature change, can change color in a specific temperature range, and the color change is reversible.

[0069] In the embodiment of the present application, the heat-induced color-changing material can be selected from organic heat-induced color-changing materials such as bisanthrone, Schiff base, spiropyran, spirooxazine and polymer, or a reversible ternary heat-induced color-changing material composed of a leuco agent, a color-developing agent and a solvent; in the reversible ternary heat-induced color-changing material, the leuco agent provides a heat-induced color-changing group, and the color-developing agent initiates heat-induced color change.

[0070] In some preferable embodiments, the thermochromic material is selected as thermochromic microcapsules containing crystal violet lactone and having a color change threshold of 35℃±0.5℃; crystal violet lactone has high sensitivity to temperature change, and has bright color and significant color change, and is a widely used color-changing material; specifically, in the thermochromic microcapsules, crystal violet lactone is used as a leuco agent; the thermochromic microcapsules further contain a color developing agent and a solvent, and the color developing agent is used to induce the color development of crystal violet lactone, for example, bisphenol A can develop crystal violet lactone into blue at a lower temperature; other auxiliary leuco agents, such as rhodamine B lactone which develops red under acidic conditions, can also be added to the thermochromic microcapsules; through the combination of multiple leuco agents and color developing agents and the design of the internal structure of the microcapsules, a variety of temperature-regulated color-changing systems, such as blue-red color change or blue-orange-red color change, can be realized; the thermochromic microcapsules used in the embodiments of the present application can be purchased on the market or prepared according to the formula and preparation method obtained from related prior art.

[0071] In the embodiments of the present application, the nano boron nitride can improve the thermal conductivity of the temperature-sensitive color-changing ink, and ensure the sensitivity of the thermochromic microcapsules; the fluorescent enhancer can improve the color developing contrast of the temperature-sensitive color-changing ink.

[0072] In some preferable embodiments, the fluorescent enhancer can be selected as rare earth complex Eu(TTA)3; by using the fluorescent enhancer, the color developing contrast of the thermochromic microcapsules under ultraviolet light can be improved by 200%.

[0073] In the embodiments of the present application, the resin base material of the temperature-sensitive color-changing ink can be selected as environmentally friendly and non-toxic water-based acrylic resin.

[0074] In some preferable embodiments, the mass ratio of the resin base material, the thermochromic microcapsules, the nano boron nitride and the fluorescent enhancer is 55%, 30%, 10% and 5%, respectively.

[0075] In the embodiments of the present application, the temperature-sensitive color-changing ink can be printed on the outer surface of the waterproof film according to a preset ink pattern (such as a thermometer icon) by using flexible electronic printing technology, and after drying, a color-changing sensitive layer with a thickness of 15±2μm is formed.

[0076] Based on the above embodiments and embodiments, in order to better illustrate the implementation manner and beneficial effects of the technical scheme of the present application, the following specific embodiments are further provided; it should be noted that the following specific embodiments are only exemplary in nature, and do not limit the scope of protection of the present application in any form.

[0077] Embodiment 1

[0078] The present embodiment provides a self-adaptive temperature-regulated paper diaper.

[0079] The paper diaper comprises, from inside to outside, a non-woven fabric layer, an absorbent core layer, a heat-conducting fiber layer, and a waterproof film.

[0080] The base material and parameters of the absorbent core layer, the heat-conducting fiber layer, and the waterproof film are selected according to the solutions provided in the above embodiments.

[0081] The density of the air holes on the waterproof film is 80 per cm 2 The diameter of the air holes on the front part of the waterproof film is 25 μm, and the diameter of the air holes on the rear part of the waterproof film is 8 μm.

[0082] The inner side of the waterproof film is attached with a plurality of TRP films, the composition of the TRP film is poly-N-isopropyl acrylamide (PNIPAM) / polyethylene glycol (PEG) copolymer (mass ratio 7:3), the thickness of the TRP film is 0.05 μm, the phase transition temperature of the TRP film is 28℃, the TRP film shrinks when the temperature is higher than 28℃, and the TRP film expands when the temperature is lower than 28℃.

[0083] In this embodiment, the heat-induced deformation of the TRP film controls the shielding area of the TRP film on the air hole distribution area of the waterproof film, so as to realize the adaptive adjustment of the heat dissipation / heat preservation of the paper diaper; when the temperature is ≥28℃, the TRP film has a shrinkage rate of ≥40%, the air duct (the gas flow channel formed by the air holes) is unfolded, and the paper diaper enters the heat dissipation mode; when the temperature is ≤25℃, the TRP film has an expansion rate of ≥30%, the air duct is closed, and the paper diaper enters the heat preservation mode; when the temperature is between 25℃ and 35℃, the paper diaper enters the heat dissipation / heat preservation balance mode.

[0084] After the infant wears the paper diaper provided in this embodiment, the microclimate formed between the paper diaper and the human skin always maintains a healthy and comfortable state, and the human body will not feel cold or stuffy, so the body activity of the infant in the daytime is not affected, and the sleep quality of the infant at night can be effectively guaranteed, especially when the paper diaper is used at night, the infant will not feel uncomfortable after urination, thereby reducing the frequency of getting up at night, and avoiding the occurrence of diaper rash and other problems.

[0085] Embodiment 2

[0086] This embodiment provides a high-sensitivity color-changing paper diaper.

[0087] On the basis of Embodiment 1, a temperature-sensitive color-changing ink with a color-changing threshold of 35℃ (blue below 35℃ and red above 35℃) is printed on the outer side of the waterproof film.

[0088] The color-changing and temperature control sensitivity of the paper diaper provided in this embodiment are tested, and the temperature of the urine used in the test is 36℃; after the absorbent layer of the paper diaper is immersed in the urine, the color-changing ink changes from blue to red within 2 minutes, the response time of the TRP film is less than 30 seconds, and the temperature on the inner side of the paper diaper decreases by 4℃ within 5 minutes.

[0089] The paper diaper provided in the embodiment is subjected to a cycle stability test, and the effective cycle number of the TRP film is greater than 1000 times.

[0090] After the infant wears the paper diaper provided in the embodiment and urinates, the discoloration ink pattern on the outer surface of the paper diaper changes from blue to red, reminding the caregiver to clean and replace a new paper diaper in time, so as to avoid diaper rash and even urinary system infection of the infant.

[0091] Embodiment 3

[0092] The embodiment provides a paper diaper capable of long-term heat preservation in a low-temperature environment.

[0093] The embodiment refers to the embodiment 1, and the difference lies in that the phase transition temperature of the TRP film used in the paper diaper is 25 DEG C, and the air duct closure rate is greater than 95% at low temperature (for example, less than 10 DEG C).

[0094] The embodiment is based on the embodiment 1, and 10 wt% of palm wax phase change microcapsules (the phase transition temperature is 34 DEG C) are added to the absorption core layer, and the energy storage capacity retention rate of the palm wax phase change microcapsules is greater than 98% after 500 cycles.

[0095] A constant temperature heat source is used to simulate the heat preservation capacity of the paper diaper, and when the external environment temperature is 5 DEG C, the surface temperature of the paper diaper provided in the embodiment is maintained in the golden temperature interval of 28 DEG C to 35 DEG C for 7 hours.

[0096] The infant has weak body temperature regulation ability, thin subcutaneous fat, sensitive and fragile skin, and is easy to lose heat, and wearing the paper diaper capable of long-term heat preservation provided in the embodiment can reduce cold stimulation and reduce the disease risk caused by chilling, especially in the winter low-temperature environment and the summer air conditioning environment, and has important protection significance for the health of the infant.

[0097] Embodiment 4

[0098] The embodiment provides an all-weather adaptive paper diaper.

[0099] The embodiment of the application is based on the embodiment 1, and three threshold discoloration inks are printed on the outer side of the waterproof film (see Figure 4 The discoloration ink is blue below 28 DEG C, orange at 28 DEG C to 33 DEG C, and red at 33 DEG C to 38 DEG C).

[0100] 10 wt% of palm wax phase change microcapsules (the phase transition temperature is 33 DEG C to 35 DEG C) are added to the absorption core layer.

[0101] The paper diaper provided in the embodiment can realize automatic heat dissipation / heat preservation adjustment at an ambient temperature of 10-45 DEG C, the temperature difference adaptation range is increased by 60% compared with the traditional paper diaper, and the comprehensive cost is reduced by at least 35% compared with the traditional electronic temperature control scheme.

[0102] The paper diaper provided in the embodiment combines the advantages of the paper diapers in the above embodiments, plays the synergistic effect of heat preservation and air permeability of the paper diaper, realizes self-adaptive temperature control in a larger temperature range, and realizes more accurate visual temperature control response through the three-threshold color-changing ink; the paper diaper provided in the embodiment is suitable for different seasons, ambient temperatures and individual differences of infants, and provides all-weather comfortable and healthy nursing experience for infants.

[0103] The performance test results of the paper diaper provided in the above specific embodiments and the conventional product (general paper diaper of common brands on the market) are shown in Table 1.

[0104]

[0105] Table 1 Performance test results of paper diaper

[0106] The above described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An adaptive temperature-controlled smart diaper, comprising an absorbent core layer, a thermally conductive fiber layer, and a waterproof membrane arranged sequentially from the inside out, wherein the waterproof membrane has multiple breathable pores; Its features are, A thermotropic polymer film is adhered to the inner side of the waterproof membrane; the thermotropic polymer film shrinks when the temperature is higher than the phase transition temperature to reduce the area of ​​the waterproof membrane's pores that are blocked; the thermotropic polymer film expands when the temperature is lower than the phase transition temperature to increase the area of ​​the waterproof membrane's pores that are blocked. The thermodeformable polymer film has a shrinkage rate of ≥30% when the temperature is above the phase transition temperature and an expansion rate of ≥20% when the temperature is below the phase transition temperature.

2. The adaptive temperature-controlled smart diaper according to claim 1, characterized in that, The density of the pores in the waterproof membrane is 50-120 pores / cm³. 3 ; The vent holes located at the front of the waterproof membrane have a diameter of 20~30μm, and the vent holes located at the rear of the waterproof membrane have a diameter of 5~10μm.

3. The adaptive temperature-controlled smart diaper according to claim 1, characterized in that, The inner wall of the vent is coated with a superhydrophobic coating.

4. The adaptive temperature-controlled smart diaper according to claim 3, characterized in that, The superhydrophobic coating is made of polydimethylsiloxane.

5. The adaptive temperature-controlled smart diaper according to claim 1, characterized in that, The phase transition temperature of the thermo-deformable polymer film is 25~30℃.

6. The adaptive temperature-controlled smart diaper according to claim 5, characterized in that, The thermo-deformable polymer film is made of poly(N-isopropylacrylamide) / polyethylene glycol copolymer.

7. The adaptive temperature-controlled smart diaper according to claim 1, characterized in that, The absorber core layer contains a phase change energy storage material with a phase change temperature of 30~36℃. The phase change energy storage material absorbs heat when the temperature is higher than the phase change temperature and releases heat when the temperature is lower than the phase change temperature.

8. The adaptive temperature-controlled smart diaper according to claim 7, characterized in that, The phase change energy storage material is a modified palm wax microcapsule.

9. The adaptive temperature-controlled smart diaper according to claim 8, characterized in that, The modified palm wax microcapsules account for 10 wt% of the absorbent core layer.

10. The adaptive temperature-controlled smart diaper according to claim 1, characterized in that, The thermal conductivity of the thermally conductive fiber layer is ≥0.9 W / m·K.

11. The adaptive temperature-controlled smart diaper according to claim 1, characterized in that, The thermally conductive fiber layer is made of a blend of polyester fiber and graphene-coated fiber.

12. The adaptive temperature-controlled smart diaper according to claim 11, characterized in that, The thermally conductive fiber layer comprises 85% polyester fiber and 15% graphene-coated fiber by mass.

13. The adaptive temperature-controlled smart diaper according to any one of claims 1-12, characterized in that, The outer side of the waterproof membrane is coated with thermosensitive color-changing ink; The thermochromic ink comprises a resin substrate and thermochromic microcapsules, nano-boron nitride, and a fluorescence enhancer dispersed in the resin substrate.

14. The adaptive temperature-controlled smart diaper according to claim 13, characterized in that, The thermochromic microcapsules contain crystal violet lactone.

15. The adaptive temperature-controlled smart diaper according to claim 13, characterized in that, The fluorescence enhancer is a rare earth complex Eu(TTA)3.

16. The adaptive temperature-controlled smart diaper according to claim 13, characterized in that, The resin substrate, thermochromic microcapsules, nano boron nitride, and fluorescence enhancer have mass percentages of 55%, 30%, 10%, and 5%, respectively.

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