Intelligent protection paper diaper with self-adaptive temperature control function

Abstract

The invention discloses a self-adaptive temperature control intelligent protection paper diaper, and relates to the technical field of hygienic products. The intelligent protection paper diaper with the self-adaptive temperature control function comprises an absorption core layer, a heat conduction fiber layer and a waterproof film which are sequentially arranged from inside to outside, a plurality of air holes are formed in the waterproof film, and a thermally-induced deformation polymer film is attached to the inner side of the waterproof film; the thermotropic deformation polymer film shrinks when the temperature is higher than the phase change temperature, so that the shielding area of the air holes of the waterproof film is reduced; the thermotropic deformation polymer film expands when the temperature is lower than the phase change temperature, so that the shielding area of the air holes of the waterproof film is increased; according to the technical scheme, self-adaptive temperature regulation and control of the paper diaper are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitary products, and in particular to a self-adaptive temperature-controlled smart diaper. Background Art

[0002] Diapers are disposable sanitary products designed for babies or adults, which have the characteristics of easy replacement, hygiene and strong absorbency.

[0003] The breathability of diapers at different temperatures has an important impact on wearing comfort. If the breathability is poor, the high temperature and humid environment in the diaper will not only aggravate the discomfort, but also the long-term residence of harmful substances in urine will lead to the growth of bacteria and fungi, which will not only irritate the skin but also increase the risk of urinary tract infection. At the same time, diapers also need a certain degree of thermal insulation to prevent the wearer from catching a cold. Therefore, how to adaptively control the temperature of diapers has become an urgent problem to be solved for high-end diapers. At present, some diaper products use thermosensitive colorimetric materials to monitor temperature, but lack active temperature control or automatic adjustment functions. The few diapers with temperature control functions mostly use metal or electronic components, which have safety risks and high costs, and are also less comfortable to wear. Summary of the Invention

[0004] The present invention provides a self-adaptive temperature-controlled smart protection diaper, which aims to achieve the self-adaptive adjustment function of heat dissipation / heat preservation of the diaper through environmental response materials.

[0005] The self-adaptive temperature-control smart diaper provided by the present invention comprises an absorbent core layer, a heat-conducting fiber layer and a waterproof film arranged in sequence from the inside to the outside, wherein the waterproof film is provided with a plurality of ventilation holes;

[0006] A thermo-deformable polymer film is adhered to the inner side of the waterproof membrane; the thermo-deformable polymer film shrinks when the temperature is higher than the phase transition temperature to reduce the blocking area of ​​the air vents of the waterproof membrane; the thermo-deformable polymer film expands when the temperature is lower than the phase transition temperature to increase the blocking area of ​​the air vents of the waterproof membrane.

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

[0008] The diameter of the air holes located in the front of the waterproof membrane is 20-30 μm, and the diameter of the air holes located in the rear of the waterproof membrane is 5-10 μm.

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

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

[0011] Optionally, the shrinkage rate of the thermo-deformable polymer 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.

[0012] Optionally, the phase transition temperature of the thermo-deformable polymer film is 25-30°C.

[0013] Optionally, the thermo-deformable polymer film is made of poly (N-isopropylacrylamide) / polyethylene glycol copolymer.

[0014] Optionally, a phase change energy storage material is dispersed in the absorption core layer, and the phase change temperature of the phase change energy storage material is 30-36°C; 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.

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

[0016] Optionally, the modified palm wax microcapsules account for 10 wt % in the absorbent core layer.

[0017] Optionally, the thermal conductivity of the thermally conductive fiber layer is ≥0.9 W / m·K.

[0018] Optionally, the thermally conductive fiber layer is formed by blending polyester fibers and graphene-coated fibers.

[0019] Optionally, the thermally conductive fiber layer includes 85% by mass of polyester fibers and 15% by mass of graphene-coated fibers.

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

[0021] The temperature-sensitive color-changing ink comprises 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 substrate, thermochromic microcapsules, nano-boron nitride and fluorescence enhancer are 55%, 30%, 10% and 5% respectively.

[0025] Optionally, the inner side of the smart diaper further includes a non-woven fabric layer, and the smart diaper comprises a non-woven fabric layer, an absorbent core layer, a heat-conducting fiber layer and a waterproof film from the inside to the outside.

[0026] The present invention has the following beneficial effects:

[0027] The waterproof membrane adopted in the technical solution of the present invention is provided with multiple air holes, and a thermo-deformable polymer film is attached to the inner side of the waterproof membrane. The thermo-deformable polymer film shrinks when the temperature is higher than the phase transition temperature to reduce the blocking area of ​​the air holes of the waterproof membrane, thereby improving the air permeability and heat dissipation performance of the diaper, and the diaper enters the heat dissipation mode; the thermo-deformable polymer film expands when the temperature is lower than the phase transition temperature to increase the blocking area of ​​the air holes on the waterproof membrane, improve the heat preservation ability of the diaper, reduce heat loss at the wearing point, and the diaper enters the heat preservation mode; the present invention realizes adaptive temperature control of the diaper by automatically adjusting the blocking area of ​​the air holes on the waterproof membrane by the thermo-deformable polymer film. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 Schematic diagram of the laminated structure of some embodiments of the self-adaptive temperature-controlled smart diapers of the present invention;

[0030] Figure 2 This is a schematic diagram (a cross-sectional diagram) showing the principle of adaptive heat dissipation / heat preservation adjustment of the diaper through the TRP film in some embodiments of the adaptive temperature control smart protection diaper of the present invention;

[0031] Figure 3 This is a second schematic diagram (planar schematic diagram) of the principle of achieving adaptive heat dissipation / heat preservation adjustment of the diaper through the TRP film in some embodiments of the adaptive temperature control smart protection diaper of the present invention;

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

[0033] Description of reference numerals:

[0034] 1. Absorbent core layer; 2. Thermal conductive fiber layer; 3. TRP film; 4. Waterproof membrane; 4-1. Breathable holes; 5. Temperature-sensitive color-changing ink. DETAILED DESCRIPTION

[0035] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] The adaptive temperature-controlled smart protection diapers provided in the embodiments of the present invention are intended to achieve the adaptive adjustment function of heat dissipation / heat preservation of the diapers through environmentally responsive materials.

[0037] See Figure 1 and Figure 2 In an embodiment of the present invention, the adaptive temperature control smart diaper includes an absorbent core layer 1, a heat conductive fiber layer 2 and a waterproof film 4 which are sequentially arranged from the inside to the outside.

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

[0039] In an embodiment of the present invention, the material of the waterproof membrane includes but is not limited to a combination of one or more polymer films such as polypropylene (PP), polyethylene (PE), thermoplastic polyurethane (TPU), polylactic acid (PLA) and their derivatives; in some preferred embodiments, the waterproof membrane can be made of TPU material, which has excellent elasticity, is environmentally friendly and degradable.

[0040] In some embodiments, the density of the air holes on the waterproof membrane is 50 to 120 per cm 3 The diameter of the air holes located in the front of the waterproof membrane is 20~30μm, and the diameter of the air holes located in the back of the waterproof membrane is 5~10μm.

[0041] Among them, the front part of the waterproof membrane refers to the part close to the abdomen when the diaper is worn on the user, and the back part of the waterproof membrane refers to the part close to the buttocks; setting a larger air hole diameter on the front part of the waterproof membrane is conducive to rapid heat dissipation, and setting a smaller air hole diameter on the back part is conducive to balancing the heat dissipation and heat preservation effects.

[0042] In some embodiments, the inner walls of the air pores on the waterproof membrane are coated with a hydrophobic coating to prevent urine from leaking through these air pores; optional materials for the hydrophobic coating include but are not limited to polydimethylsiloxane (PDMS), polymethylphenylsiloxane (PMPS) and other silicone derivatives, fluorosilicone copolymers, polyacrylate hydrophobic modified materials, beeswax / plant wax and other natural hydrophobic materials, etc.

[0043] In some preferred embodiments, the inner wall of the vent 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 an embodiment of the present invention, the absorbent core layer includes a super absorbent polymer (SAP), which is used to efficiently absorb urine; the super absorbent polymer includes but is not limited to polyacrylates (such as sodium polyacrylate, modified polyacrylates), starch-based polymers (such as starch-acrylic acid graft copolymers, starch-acrylonitrile hydrolysates), cellulose-based polymers (such as carboxymethyl cellulose and its derivatives, cellulose graft copolymers), polyvinyl alcohols, natural polymer composite materials (such as composite materials composed of sodium alginate, chitosan, pectin, etc. and polymer skeletons) and other materials. One or more combinations thereof.

[0045] In an embodiment of the present invention, the heat-conducting layer located between the absorption core layer and the waterproof membrane is used to conduct heat, and needs to have high-efficiency thermal conductivity, soft skin-friendliness, resistance to liquid penetration and mechanical stability, and at the same time needs to be compatible with the absorption core layer and the waterproof membrane; the material of the heat-conducting layer can be selected from one or more of polyester fiber-based composite materials, polyamide-based composite materials, natural fiber heat-conducting materials (such as bamboo fiber, hemp fiber, silk protein, etc.), and inorganic non-metal heat-conducting materials (such as carbon fiber non-woven fabrics, aerogel-coated fibers, and carbon-coated fibers).

[0046] In some preferred embodiments, the thermal conductive fiber layer is formed by a blend of polyester fibers and graphene-coated fibers; the polyester fibers form the skeleton support structure of the thermal conductive fiber layer, and the graphene-coated fibers have high thermal conductivity, forming a thermal conductive path; the polyester fiber and graphene-coated fiber composite material prepared by the blending process has the advantages of high thermal conductivity, light weight, and softness as a whole.

[0047] In some specific embodiments, the thermally conductive fiber layer is formed by blending 85% by mass of polyester fibers and 15% by mass of graphene-coated fibers, and the overall thermal conductivity of the thermally conductive fiber layer is ≥0.9 W / m·K.

[0048] In some embodiments, a non-woven fabric layer is further provided on the inside of the diaper. The adaptive temperature-controlled smart diaper includes a non-woven fabric layer, an absorbent core layer, a heat-conducting fiber layer and a waterproof film arranged in sequence from the inside to the outside; the non-woven fabric layer is usually made of hydrophilic non-woven fabric. When the diaper is worn, the non-woven fabric layer is located between the wearer's skin and the absorbent core layer of the diaper to quickly absorb and divert urine, while preventing the material in the absorbent core layer from directly rubbing the skin, and avoiding the urine in the absorbent core layer from seeping back into the skin.

[0049] Based on the above embodiments, the first aspect of the present invention uses a thermo-deformable polymer film to achieve adaptive heat dissipation / heat preservation of diapers.

[0050] Specifically, see Figure 1 In the embodiment of the present invention, a thermo-deformable polymer (TRP) film 3 is attached to the inner side of the waterproof membrane 4; Figure 2 and Figure 3 When the temperature is higher than the phase transition temperature, the TRP film 3 shrinks to reduce the blocking area of ​​the air holes 4-1 of the waterproof membrane 4; when the temperature is lower than the phase transition temperature, the TRP film 3 expands to increase the blocking area of ​​the air holes 4-1 of the waterproof membrane 4.

[0051] In the embodiment of the present invention, the area of ​​the air holes blocked by the TRP film can be quantified by the number of blocked air holes; the number, shape and arrangement of the TRP films are not particularly limited, and multiple TRP films in regular or irregular arrangements can be attached to the inner surface of the waterproof membrane. The shape of the TRP film can be selected from one or more of various shapes such as circular, square, triangular, and regular hexagonal; the overall ventilation effect of the waterproof membrane + TRP film can be described by the states of the air duct being closed, half-open, and fully open; the "air duct" refers to the gas flow channel formed by the air duct; for example Figure 2 and Figure 3 The waterproof membrane 4 shown in the figure is provided with an array of air holes that are evenly arranged and have the same aperture. When the temperature is low, the TRP film expands and blocks a large number of air holes, which can be defined as a closed air duct state, and the diaper enters a heat preservation mode; when the temperature is more comfortable, the expansion rate or contraction rate of the TRP film is low, and only a general number of air holes are blocked, which can be defined as a half-open air duct state, and the diaper enters a heat dissipation / heat preservation balance mode; when the temperature is high, the TRP film contracts, and most of the air holes are not blocked, which can be defined as a fully open air duct state, and the diaper enters a heat dissipation mode.

[0052] Among them, the materials of TRP films include but are not limited to poly N-isopropylacrylamide (PNIPAM), poly N-isopropylmethacrylamide (PNIPMAM), polyethylene glycol dimethacrylate (POEGMA), poly N-n-propylacrylamide (PNNPAM), poly N-vinylcaprolactam (PVca) and other thermoplastic polymers with a temperature response range of 15~50°C. These thermoplastic polymers undergo reversible and adjustable phase transitions of volume expansion or contraction near the phase transition temperature.

[0053] In some embodiments, the TRP film shrinks by ≥30% when the temperature is higher than the phase transition temperature, and expands by ≥20% when the temperature is lower than the phase transition temperature, so as to effectively reduce or increase the blocking area of ​​the air vents of the waterproof membrane.

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

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

[0056] PNIPAM / PEG copolymer is a block copolymer composed of PNIPAM and PEG. The critical solution temperature (LCST) of PNIPAM is about 32°C, close to human body temperature. The groups in the PNIPAM molecule are hydrophilic when the temperature is below the LCST. In an aqueous environment (such as urine immersion), the molecular segments are extended, and the macroscopic manifestation is volume expansion. When the temperature is higher than the LCST, the groups in the PNIPAM molecule are hydrophobic, and the molecular segments shrink in an aqueous environment, and the macroscopic manifestation is volume contraction. The introduction of PEG can adjust the phase transition temperature of PNIPAM to an appropriate value. PEG has better biocompatibility and flexibility than PNIPAM. The copolymer formed by combining the two has both the temperature sensitivity of PNIPAM and the excellent properties of PEG.

[0057] In some preferred 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 approximately 28°C.

[0058] In the embodiment of the present invention, a thermo-deformable polymer film is bonded to the inner side of the waterproof membrane. The thermo-deformable polymer film shrinks when the temperature is high, reducing the blocking area of ​​the air holes on the waterproof membrane, thereby improving the air permeability and heat dissipation performance of the diaper, and the diaper enters the heat dissipation mode; the thermo-deformable polymer film expands when the temperature is low, increasing the blocking area of ​​the air holes on the waterproof membrane, reducing heat loss, and causing the diaper to enter the heat preservation mode; the embodiment of the present invention realizes adaptive temperature control of the diaper through the automatic adjustment of the blocking area of ​​the air holes on the waterproof membrane by the thermo-deformable polymer film.

[0059] The second aspect of the present invention uses phase change energy storage materials to achieve adaptive heat dissipation / heat preservation of diapers.

[0060] Specifically, in an embodiment of the present invention, phase change energy storage material is dispersed in the absorption core layer, and the phase change temperature of the phase change energy storage material is 30~36°C; 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.

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

[0062] In some preferred embodiments, modified palm wax microcapsules are selected as the phase change energy storage material; palm wax is a natural wax extracted from palm tree fruits, and its main components are fatty acid esters, free fatty acids, sterols, etc. By compounding low-melting point components (such as capric acid) and microencapsulation technology, the phase change temperature (melting point) of the obtained modified palm wax microcapsules is reduced to the range of 30~36°C, which can meet the phase change energy storage requirements of diapers.

[0063] In some preferred embodiments, the particle size of the modified palm wax microcapsules is 215 μm, and the coverage rate is ≥98%.

[0064] In some more preferred embodiments, the phase transition temperature of the modified palm wax microcapsules is 33~35°C, the coverage rate is 99%, and the modified palm wax microcapsules are incorporated into the highly absorbent polymer of the absorbent core layer, accounting for 10wt%.

[0065] The modified palm wax microcapsules used in the above embodiment are biodegradable, with a biodegradation rate of ≥90%, meeting high standards of environmental protection requirements, and are non-toxic and have good stability.

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

[0067] Specifically, in an embodiment of the present invention, the outer side of the waterproof membrane is coated with a temperature-sensitive color-changing ink, which includes a resin matrix and thermochromic microcapsules, nano boron nitride, and a fluorescence enhancer dispersed in the resin matrix.

[0068] Among them, thermochromic microcapsules are formed by encapsulating thermochromic materials (such as organic dyes) in tiny shells (such as polymer wall materials) through microencapsulation technology. The core of the technology is that the thermochromic material in the capsule is sensitive to temperature changes, can change color within a specific temperature range, and this color change is reversible.

[0069] In an embodiment of the present invention, the thermochromic material may be an organic thermochromic material such as dianthrone, Schiff base, spiropyran, spirooxazine, polymer, etc., or a reversible ternary thermochromic material composed of a leucochrome, a developer and a solvent may be selected; in the reversible ternary thermochromic material, the leucochrome provides a thermochromic group, and the developer triggers thermochromism.

[0070] In some preferred embodiments, the thermochromic material is selected from thermochromic microcapsules containing crystal violet lactone and having a color change threshold of 35°C±0.5°C; crystal violet lactone is highly sensitive to temperature changes, and has bright colors and significant color changes, and is a widely used color-changing material; specifically, in the thermochromic microcapsules, crystal violet lactone is used as a leucochrome; the thermochromic microcapsules also include a developer and a solvent, and the developer is used to trigger the color development of crystal violet lactone. For example, bisphenol A can turn crystal violet lactone blue at a lower temperature; other auxiliary leucochromes can also be added to the thermochromic microcapsules, such as rhodamine B lactone that turns red under acidic conditions; a variety of temperature-regulated color change systems can be achieved by compounding multiple leucochromes and developers and designing the internal structure of the microcapsules, such as blue-red color change or blue-orange-red color change; the thermochromic microcapsules used in the embodiments of the present invention can be purchased from the market, or prepared by obtaining the formula and preparation method from the relevant existing technology.

[0071] In the embodiment of the present invention, nano boron nitride can improve the thermal conductivity of the thermochromic ink and ensure the sensitivity of the thermochromic microcapsules to change color; the fluorescence enhancer can improve the color contrast of the thermochromic ink.

[0072] In some preferred embodiments, the fluorescence enhancer can be selected from the rare earth complex Eu(TTA)3. By using this fluorescence enhancer, the color contrast of the thermochromic microcapsules under ultraviolet light can be increased by 200%.

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

[0074] In some preferred embodiments, the mass proportions of the resin substrate, thermochromic microcapsules, nano-boron nitride and fluorescence enhancer are 55%, 30%, 10% and 5% respectively.

[0075] In the embodiment of the present invention, the temperature-sensitive color-changing ink can be printed on the outer surface of the waterproof membrane according to a preset ink pattern (such as a thermometer icon) through flexible electronic printing technology. After the temperature-sensitive color-changing ink dries, a color-sensitive layer with a thickness of 15±2μm is formed.

[0076] Based on the above embodiments and implementation methods, in order to better illustrate the implementation methods and beneficial effects of the technical solutions of the present invention, the present invention also proposes the following specific embodiments. It should be noted that the following specific embodiments are only illustrative and are not any form of limitation to the scope of protection of the present invention.

[0077] Example 1

[0078] This embodiment provides a diaper with adaptive temperature regulation.

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

[0080] The basic materials and parameters of the absorption core layer, the heat-conducting fiber layer and the waterproof membrane are selected with reference to the solutions provided in the above embodiments.

[0081] The density of air holes on the waterproof membrane is 80 / cm 2 The pore size of the front air vents of the waterproof membrane is 25μm, and the pore size of the rear air vents is 8μm.

[0082] Several TRP films are attached to the inner side of the waterproof membrane. The composition of the TRP film is poly N-isopropylacrylamide (PNIPAM) / polyethylene glycol (PEG) copolymer (mass ratio 7:3), the thickness is 0.05μm, and the phase transition temperature of the TRP film is 28°C. When the temperature is higher than 28°C, the TRP film shrinks; when the temperature is lower than 28°C, the TRP film expands.

[0083] This embodiment uses the thermal deformation of the TRP film to control its blocking area on the air vent distribution area of ​​the waterproof membrane, thereby achieving adaptive adjustment of the heat dissipation / heat preservation of the diaper; when the temperature is ≥28°C, the shrinkage rate of the TRP film is ≥40%, the air duct (the gas flow channel formed by the air vents) is expanded, and the diaper enters the heat dissipation mode; when the temperature is ≤25°C, the expansion rate of the TRP film is ≥30%, the air duct is closed, and the diaper enters the heat preservation mode; when the temperature is between 25°C and 35°C, the diaper enters the heat dissipation / heat preservation balance mode.

[0084] After infants and young children put on the diapers provided by this embodiment, the microclimate formed between the diapers and the human skin is always maintained in a healthy and comfortable state, and the human body will not feel cold or stuffy. Therefore, the physical activities of infants and young children during the day are not affected, and the quality of sleep at night can be effectively guaranteed. Especially when using the diapers at night, infants and young children will not feel discomfort after urinating, thereby reducing the frequency of getting up at night, and at the same time avoiding the occurrence of problems such as diaper rash.

[0085] Example 2

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

[0087] In this embodiment, based on the embodiment 1, a temperature-sensitive color-changing ink with a color-changing threshold of 35°C (blue below 35°C and red above 35°C) is printed on the outside of the waterproof membrane.

[0088] The diapers provided in this embodiment were tested for color change and temperature control sensitivity. The urine temperature used in the test was 36°C. When the absorbent layer of the diaper was immersed in urine, the color-changing ink changed from blue to red within 2 minutes. The response time of the TRP film was less than 30 seconds. The temperature on the inside of the diaper dropped by 4°C within 5 minutes.

[0089] The diapers provided in this embodiment were subjected to a cycle stability test, and the effective cycle number of the TRP film was greater than 1000 times.

[0090] After an infant urinates while wearing the diaper provided by this embodiment, the color-changing ink pattern on the outer surface of the diaper changes from blue to red, reminding the caregiver to clean and replace the diaper in time to avoid problems such as diaper rash or even urinary tract infection in the infant.

[0091] Example 3

[0092] This embodiment provides a diaper that can retain heat for a long time in a low-temperature environment.

[0093] This embodiment refers to embodiment 1, except that the phase transition temperature of the TRP film used in the diaper is 25°C. At low temperatures (e.g., less than 10°C), the air duct closure rate is greater than 95%.

[0094] In this embodiment, based on Example 1, 10 wt% of palm wax phase change microcapsules (phase change temperature is 34° C.) are added to the absorbent core layer. 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 was used to simulate the heat preservation ability of diapers. When the external ambient temperature was 5°C, the surface temperature of the diapers provided in this embodiment was maintained in the golden temperature range of 28°C to 35°C for up to 7 hours.

[0096] Infants and young children have weak body temperature regulation ability, thin subcutaneous fat, sensitive and fragile skin, and are prone to heat loss. Wearing the long-lasting heat-insulating diapers provided in this embodiment can reduce cold stimulation and reduce the risk of diseases caused by colds, especially in low-temperature environments in winter and air-conditioned environments in summer, which is of great protective significance to the health of infants and young children.

[0097] Example 4

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

[0099] The embodiment of the present invention is based on the embodiment 1, and the three-threshold color changing ink is printed on the outside of the waterproof film (see Figure 4 The color-changing ink turns blue when it is below 28℃, orange when it is between 28℃ and 33℃, and red when it is between 33℃ and 38℃).

[0100] 10wt% palm wax phase change microcapsules (phase change temperature is 33~35℃) are added to the absorbent core layer.

[0101] The diapers provided in this embodiment can achieve automatic adjustment of heat dissipation / heat preservation at an ambient temperature of 10°C to 45°C. The temperature difference adaptation range is expanded by 60% compared with traditional diapers, and the overall cost is reduced by at least 35% compared with traditional electronic temperature control solutions.

[0102] The diapers provided in this embodiment combine the advantages of the diapers in the above embodiments, give full play to the synergistic effect of the thermal insulation and breathability of the diapers, can achieve adaptive temperature control within a larger temperature range, and achieve a more accurate visual temperature control response through three-threshold color-changing ink; the diapers provided in this embodiment are suitable for different seasons, ambient temperatures and individual differences of infants and young children, providing infants and young children with an all-day comfortable and healthy care experience.

[0103] The relevant performance test results of the diapers provided in the above specific embodiments and traditional products (general diapers of common brands on the market) are shown in Table 1.

[0104]

[0105] Table 1 Diaper performance test results

[0106] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A self-adaptive temperature-control diaper comprising an absorbent core layer, a heat-conducting fiber layer, and a waterproof membrane, arranged in sequence from the inside out. The waterproof membrane has a plurality of ventilation holes. It is characterized by: A thermo-deformable polymer film is adhered to the inner side of the waterproof membrane; the thermo-deformable polymer film shrinks when the temperature is higher than the phase transition temperature to reduce the blocking area of ​​the air vents of the waterproof membrane; the thermo-deformable polymer film expands when the temperature is lower than the phase transition temperature to increase the blocking area of ​​the air vents of the waterproof membrane.

2. The self-adaptive temperature-controlled smart diaper according to claim 1, characterized in that: The density of the air holes in the waterproof membrane is 50 to 120 per cm 3 ; The diameter of the air holes located in the front of the waterproof membrane is 20-30 μm, and the diameter of the air holes located in the rear of the waterproof membrane is 5-10 μm.

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

4. The self-adaptive temperature-controlled smart diaper according to claim 3, characterized in that: The material of the super hydrophobic coating is polydimethylsiloxane.

5. The self-adaptive temperature-controlled smart diaper according to claim 1, characterized in that: The shrinkage rate of the thermo-deformable polymer film is greater than or equal to 30% when the temperature is higher than the phase transition temperature, and the expansion rate is greater than or equal to 20% when the temperature is lower than the phase transition temperature.

6. The self-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°C.

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

8. The self-adaptive temperature-controlled smart diaper according to claim 1, characterized in that: Phase change energy storage material is dispersed in the absorption core layer, and the phase change temperature of the phase change energy storage material is 30-36° C. 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.

9. The self-adaptive temperature-controlled smart diaper according to claim 8, characterized in that: The phase change energy storage material is modified palm wax microcapsules.

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

11. The self-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.

12. The self-adaptive temperature-controlled smart diaper according to claim 1, characterized in that: The heat-conducting fiber layer is formed by blending polyester fibers and graphene-coated fibers.

13. The self-adaptive temperature-controlled smart diaper according to claim 12, characterized in that: The thermal conductive fiber layer includes 85% by mass of polyester fibers and 15% by mass of graphene-coated fibers.

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

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

16. The self-adaptive temperature-controlled smart diaper according to claim 14, characterized in that: The fluorescence enhancer is a rare earth complex Eu(TTA)3.

17. The self-adaptive temperature-controlled smart diaper according to claim 14, characterized in that: The mass proportions of the resin substrate, thermochromic microcapsules, nano boron nitride and fluorescence enhancer are 55%, 30%, 10% and 5% respectively.

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