Preparation method of intelligent temperature-adjusting spunlace non-woven fabric and application of intelligent temperature-adjusting spunlace non-woven fabric to paper diaper

Abstract

The invention relates to the field of hygienic products, provides a preparation method of intelligent temperature-adjusting water-thorn non-woven fabric and application of the intelligent temperature-adjusting water-thorn non-woven fabric to paper diapers, and solves the problems that existing non-woven fabric lacks an intelligent temperature-adjusting function, and the paper diapers are prone to stuffiness and insufficient in functionality. Comprising the following steps: (1) adding a double-shell phase-change material microcapsule into a spinning polymer solution, uniformly mixing to obtain a first mixed solution, and extruding the first mixed solution through a spinning nozzle to form an intelligent temperature-regulating fiber; and (2) blending the intelligent temperature-regulating fibers and the basic fibers according to the proportion of (5-7): (3-5), and preparing the intelligent temperature-regulating spunlace non-woven fabric through a spunlace production process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sanitary products, in particular to a preparation method of intelligent temperature-regulating spunlace nonwoven fabric and its application in paper diapers. BACKGROUND

[0002] In the field of sanitary products, taking paper diapers as an example, during use, the baby or user will generate heat due to the discharge of urine and other liquids and body movement, resulting in an increase in the internal temperature of the paper diaper, forming a hot and humid environment. This environment not only makes the user feel uncomfortable, but also easily causes skin problems such as red rash and itching. Traditional nonwoven fabrics usually only have basic water absorption function and lack effective temperature regulation capability, and cannot dissipate excess heat in time, making it difficult to meet the consumer's demand for comfort.

[0003] The selling points of existing paper diapers in terms of function are focused on skin care, deodorization, and antibacterial properties, mainly by adding skin care ingredients (aloe vera oil, vitamin E, weak acid substances, etc.), adding antibacterial agents or deodorizing substances. However, there are also corresponding disadvantages: ① The functional selling points are homogenized and lack of innovation; ② Manufacturers often only focus on promoting concepts, and the actual use effect cannot be verified; ③ The addition of some antibacterial agents is controversial in terms of safety.

[0004] Chinese Patent Application No. CN202410879508.7 discloses an antibacterial and breathable material for baby paper diapers and a preparation method thereof. The antibacterial and breathable material for baby paper diapers is obtained by sequentially laying a breathable layer, a propolis coating layer, a flow guide layer, and an absorption core. The absorption core is obtained by spraying water-absorbing microcapsules@alginate-polyurethane hydrogel on the surface of fluff pulp, compacting, and hot air curing. The water-absorbing microcapsules@alginate-polyurethane hydrogel is composed of 1-5 parts by weight of water-absorbing microcapsules and 10 parts by weight of alginate-polyurethane matrix. The water-absorbing microcapsules are composed of the following raw materials: 10 parts of sodium alginate, 30-80 parts of superabsorbent resin, 0.3-1.2 parts of sodium dodecyl benzene sulfonate, and 0.4-1.36 parts of diluent. The prepared material for paper diapers has good breathability, strong water absorption, and good antibacterial activity, and uses environmentally friendly and non-toxic raw materials. However, the antibacterial and breathable material does not have intelligent temperature regulation function.

[0005] Chinese patent application No. CN202420070873.9 discloses an intelligent temperature regulating paper diaper, comprising a temperature regulating upper surface layer and a temperature regulating lower surface layer, the temperature regulating upper surface layer and the temperature regulating lower surface layer form a temperature regulating layer, the temperature regulating upper surface layer and the temperature regulating lower surface layer are both composed of non-woven fabric and phase change material, the non-woven fabric is composed of fibers with a core-sheath structure, the non-woven fabric is wrapped outside the phase change material, a flow guide layer is arranged below the temperature regulating layer, a leak-proof bottom film is arranged below the flow guide layer, an outsole layer is arranged below the leak-proof bottom film, and an absorption core is arranged between the flow guide layer and the leak-proof bottom film at the private part of the paper diaper. The non-woven fabric composed of fibers with a core-sheath structure can encapsulate the phase change material inside the fibers, which can avoid the leakage of the phase change material caused by friction during the state change of the phase change material and the use of the material, and the encapsulation of the phase change material in this way can control the amount of the phase change material used, thereby achieving better phase change temperature regulating effect. In comparison with the present application, the technical solution of preparing intelligent temperature regulating fibers from double-shell phase change material microcapsules and then preparing water-jet non-woven fabric is not disclosed. SUMMARY

[0006] Therefore, in order to solve the above problems, the present application provides a preparation method of intelligent temperature regulating water-jet non-woven fabric and its application in paper diapers, which solves the problems of lack of intelligent temperature regulating function of existing non-woven fabric and poor heat resistance and insufficient functionality of paper diapers.

[0007] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0008] A preparation method of intelligent temperature regulating water-jet non-woven fabric, comprising the following steps:

[0009] S1, adding double-shell phase change material microcapsules to a spinning polymer solution, mixing uniformly to obtain a first mixed solution, and extruding the first mixed solution through a spinneret to form intelligent temperature regulating fibers;

[0010] S2, mixing the intelligent temperature regulating fibers and the base fibers in a ratio of (5-7):(3-5), and preparing intelligent temperature regulating water-jet non-woven fabric through a water-jet production process;

[0011] The preparation process of the double-shell phase change material microcapsules is as follows:

[0012] I, selection of raw materials: 15-20 parts by weight of phase change material, 1-5 parts by weight of phase change aid, 1-5 parts by weight of emulsifier, 0.1-1 parts by weight of initiator, and 60-65 parts by weight of distilled water; the phase change material is a mixture of one or more of n-octadecane, n-eicosane and polyethylene glycol in any ratio, the phase change aid is polyethylene glycol, the emulsifier is Tween-20, and the initiator is azobisisobutyronitrile;

[0013] II, the phase change material, phase change aid mixed, heated to the phase change material completely melted, and then add emulsifier, initiator and distilled water, stirring uniform, forming a stable emulsion; the phase change material in the emulsion mass fraction is 10%-30%;

[0014] III, the preparation of polyurethane prepolymer: under nitrogen protection, toluene diisocyanate is melted; polypropylene glycol is heated to 110-115℃, vacuum dewatering to the water content is less than 0.1%; then according to the molar ratio of-NCO in toluene diisocyanate and-OH in polypropylene glycol is (0.5-3):1, polypropylene glycol is added to toluene diisocyanate, the reaction temperature is controlled at 55-90℃, the concentration of-NCO group is determined by using di-n-butylamine method, when the reaction degree reaches 50%, it is considered as the reaction end point, after the reaction is completed, the temperature is lowered to room temperature, and the polyurethane prepolymer is obtained;

[0015] IV, the preparation of melamine urea-formaldehyde resin prepolymer: according to the mass ratio of melamine, 37% formaldehyde solution and distilled water is 2:2:5, melamine, 37% formaldehyde solution and distilled water are mixed uniformly, the pH value is adjusted to 7.5-8.0 by sodium hydroxide solution, heated to 70-80℃, and kept for 2 hours, after the reaction is completed, the temperature is cooled to room temperature, and the melamine urea-formaldehyde resin prepolymer solution is obtained;

[0016] V, the preparation of inner layer capsule wall: the polyurethane prepolymer obtained by step III is added to the emulsion obtained by step II, the reaction temperature is controlled at 65-80℃, and the reaction time is 1-2 hours, under the stirring condition, the interfacial polymerization reaction of toluene diisocyanate and polyethylene glycol occurs, and the polyurethane inner layer capsule wall is formed;

[0017] VI, the preparation of outer layer capsule wall: the melamine urea-formaldehyde resin prepolymer solution obtained by step IV is added dropwise into the emulsion containing the polyurethane inner layer capsule wall, the pH value is adjusted to 5.0-6.0 by ammonium sulfate, the resin is deposited on the surface of the polyurethane inner layer, and the outer layer capsule wall is formed, the reaction temperature is controlled at 65-80℃, and the reaction time is 2-3 hours, after the reaction is completed, the temperature is cooled to room temperature, and the centrifugal or filtration treatment is carried out, the surface residues are removed by using distilled water and ethanol in sequence, and the double-shell phase change material microcapsule is obtained by drying at 40℃.

[0018] Further, the gram weight of the intelligent temperature regulating water-jet nonwoven fabric is 24-60gsm.

[0019] Further, the enthalpy value of the intelligent temperature regulating fiber is 6-45J / g.

[0020] Further, the denier of the intelligent temperature regulating fiber is 1-6D.

[0021] Further, the phase change assistant is used in an amount of 2-10% of the phase change material, and the initiator is used in an amount of 0.5-2% of the phase change material.

[0022] Further, in the step S1, the spinning polymer solution is a viscose solution or a lyocell solution.

[0023] Further, in the step S2, the base fiber is a polypropylene fiber or a polyester fiber.

[0024] Further, the intelligent temperature-adjusting spunlace nonwoven fabric is applied to the upper layer or the lower layer or both of the core of the paper diaper.

[0025] Further, the intelligent temperature-adjusting spunlace nonwoven fabric is applied to the surface layer or the flow guide layer of the paper diaper.

[0026] By adopting the foregoing technical solutions, the application has the following beneficial effects:

[0027] 1. The intelligent temperature-adjusting fiber is made into a spunlace nonwoven fabric. The temperature-adjusting fiber is a new type of functional fiber. By combining the phase change material technology and the fiber manufacturing technology, the temperature can be actively adjusted according to the change of the environmental temperature, so that the human body is in a comfortable temperature. When applied to a paper diaper product, the temperature in the paper diaper cannot be too cold or too hot, so that the baby is in a comfortable wearing environment. The core principle is to use the characteristics of the phase change material in absorbing or releasing heat when converting between solid and liquid states to realize intelligent temperature adjustment. When the environmental temperature rises, the phase change material in the fiber changes from solid to liquid and absorbs heat. When the environmental temperature decreases, the phase change material changes from liquid to solid and releases the stored heat.

[0028] 2. The temperature-adjusting material used in the application is a 100% natural plant PCM phase change material. By combining the microcapsule technology, the phase change material is coated in the microcapsule, which can reduce the loss of the phase change material during processing and improve the temperature-adjusting effect. The melting point of the temperature-adjusting material is 28℃ (absorbs heat above 28℃ and releases heat below 28℃), and the melting point of the microcapsule shell is 230℃. The temperature-adjusting material is a paraffin material composed of n-octadecane, n-eicosane and polyethylene glycol. The microcapsule shell uses a more environmentally friendly and safer polyurethane material.

[0029] 3. In order to increase the mechanical strength and thermal stability of the microcapsule, the polyurethane prepolymer and the melamine urea-formaldehyde resin prepolymer are used to prepare the inner capsule wall and the outer capsule wall respectively to form a double-shell structure. This structure not only improves the mechanical strength and thermal stability of the microcapsule, prevents the leakage of the phase change material, but also effectively protects the phase change material, prolongs its service life, and makes the temperature-adjusting performance of the nonwoven fabric more durable and stable.

[0030] 4. The basis weight of intelligent temperature-regulating spunlace nonwoven fabric ranges from 24-60 gsm, meeting the needs of different fields for nonwoven fabric basis weight. It is suitable for the production of various products, such as hygiene products and clothing, thus broadening the application range of products. Applying intelligent temperature-regulating spunlace nonwoven fabric to the core of diapers helps regulate the temperature inside the diaper, keeping the baby's delicate skin in a comfortable environment and effectively preventing discomfort or diaper rash caused by overheating while wearing diapers.

[0031] 5. The application of temperature-regulating fibers, which are commonly used in underwear, loungewear, socks, home textiles, clothing, and outdoor sports equipment, as non-woven fabric in diapers represents a breakthrough across industries. This makes diaper products more innovative and also gives them new functionalities, making them increasingly intelligent. Detailed Implementation

[0032] Example 1

[0033] A method for preparing a smart temperature-regulating hydroentangled nonwoven fabric includes the following steps:

[0034] S1. Add double-shell phase change material microcapsules to a viscose solution, mix them evenly to obtain a first mixed solution, and extrude the first mixed solution through a spinneret to form a smart temperature-regulating fiber; the smart temperature-regulating fiber has an enthalpy of 6 J / g and a denier of 1.5D;

[0035] S2. The intelligent temperature-regulating fiber and polyester are blended in a 1:1 ratio and then spun together to produce an intelligent temperature-regulating spunlace nonwoven fabric through a spunlace production process; the basis weight of the intelligent temperature-regulating spunlace nonwoven fabric is 35 gsm.

[0036] The preparation process of the double-shell phase change material microcapsules is as follows:

[0037] I. Selection of raw materials: including 15 parts by weight of phase change material, 1.5 parts by weight of phase change auxiliaries, 1 part by weight of emulsifier, 0.3 parts by weight of initiator and 60 parts by weight of distilled water; the phase change material is n-octadecane, the phase change auxiliaries are polyethylene glycol, the emulsifier is Tween-20, and the initiator is azobisisobutyronitrile.

[0038] The amount of the phase change aid is 10% of the phase change material, and the amount of the initiator is 2% of the phase change material;

[0039] II. Mix the phase change material and phase change additive, heat until the phase change material is completely melted, then add emulsifier, initiator and distilled water, stir evenly to form a stable emulsion;

[0040] III. Preparation of polyurethane prepolymer: under nitrogen protection, melt toluene diisocyanate; heat polyoxypropylene glycol to 110℃, vacuum dehydration to water content less than 0.1%; then add polyoxypropylene glycol to toluene diisocyanate drop by drop according to the molar ratio of -NCO in toluene diisocyanate to -OH in polyoxypropylene glycol is 0.5:1, control the reaction temperature at 55℃, determine the concentration of -NCO group by di-n-butylamine method, when the reaction degree reaches 50%, it is considered as the end point of the reaction, after the reaction is completed, cool to room temperature to obtain polyurethane prepolymer;

[0041] IV. Preparation of melamine urea-formaldehyde resin prepolymer: according to the mass ratio of melamine, 37% formaldehyde aqueous solution and distilled water is 2:2:5, mix melamine, 37% formaldehyde aqueous solution and distilled water uniformly, adjust the pH value to 7.5 with sodium hydroxide solution, heat to 70℃, keep the reaction for 2 hours, after the reaction is completed, cool to room temperature to obtain melamine urea-formaldehyde resin prepolymer solution;

[0042] V. Preparation of inner layer capsule wall: add the polyurethane prepolymer prepared in step III to the emulsion prepared in step II, control the reaction temperature at 65℃, the reaction time is 1 hour, under stirring condition, toluene diisocyanate and polyethylene glycol occur interfacial polymerization reaction to form polyurethane inner layer capsule wall;

[0043] VI. Preparation of outer layer capsule wall: add the melamine urea-formaldehyde resin prepolymer solution prepared in step IV drop by drop to the emulsion containing polyurethane inner layer capsule wall, adjust the pH to 5.0 with ammonium sulfate, make the resin deposit on the surface of the polyurethane inner layer to form outer layer capsule wall, control the reaction temperature at 65℃, the reaction time is 2 hours, after the reaction is completed, cool to room temperature, centrifuge or filter treatment, wash with distilled water and ethanol in turn to remove surface residues, dry at 40℃ to obtain double-shell phase change material microcapsules.

[0044] The application of the above-mentioned intelligent temperature-regulating hydroentangled nonwoven fabric on the paper diaper is that the intelligent temperature-regulating hydroentangled nonwoven fabric is applied on the upper layer of the core body of the paper diaper, and can also be applied on the lower layer of the core body of the paper diaper.

[0045] In the case of low denier and low enthalpy value, that is, the denier of the intelligent temperature-regulating fiber is 1.5D, the enthalpy value of the intelligent temperature-regulating fiber is 6J / g, the intelligent temperature-regulating hydroentangled nonwoven fabric can be applied on the upper layer, the lower layer or the upper and lower layers of the core body, and the temperature-regulating effect can be improved.

[0046] Example 2

[0047] A preparation method of an intelligent temperature-regulating hydroentangled nonwoven fabric, comprising the following steps:

[0048] S1, add double-shell phase change material microcapsules to lyocell solution, after uniform mixing, obtain a first mixed solution, extrude the first mixed solution through a spinneret to form intelligent temperature regulating fibers; the enthalpy value of the intelligent temperature regulating fibers is 20 J / g, and the denier of the intelligent temperature regulating fibers is 2D;

[0049] S2, according to the proportion of 3:7 of the intelligent temperature regulating fibers and the polypropylene, the intelligent temperature regulating fibers and the polypropylene are blended, and the intelligent temperature regulating spunlace non-woven fabric is prepared through a spunlace production process; the grammage of the intelligent temperature regulating spunlace non-woven fabric is 40 gsm;

[0050] The preparation process of the double-shell phase change material microcapsules is as follows:

[0051] I, selection of raw materials: including 18 parts by weight of phase change material, 1.8 parts by weight of phase change aid, 3 parts by weight of emulsifier, 0.36 parts by weight of initiator and 62 parts by weight of distilled water; the phase change material is n-eicosane, the phase change aid is polyethylene glycol, the emulsifier is Tween-20, and the initiator is azobisisobutyronitrile;

[0052] The amount of the phase change aid is 10% of the phase change material, and the amount of the initiator is 2% of the phase change material;

[0053] II, mix the phase change material and the phase change aid, heat to completely melt the phase change material, then add the emulsifier, the initiator and the distilled water, and stir uniformly to form a stable emulsion;

[0054] III, preparation of polyurethane prepolymer: melt toluene diisocyanate under nitrogen protection; heat polyoxypropylene glycol to 112℃, and vacuum dehydrate to a water content of less than 0.1%; then, according to the molar ratio of -NCO in toluene diisocyanate to -OH in polyoxypropylene glycol is 1:1, add polyoxypropylene glycol to toluene diisocyanate, control the reaction temperature at 70℃, and determine the concentration of -NCO group by using di-n-butylamine method; when the reaction degree reaches 50%, it is considered as the reaction endpoint; after the reaction is completed, cool to room temperature to obtain polyurethane prepolymer;

[0055] IV, preparation of melamine urea-formaldehyde resin prepolymer: according to the mass ratio of melamine, 37% formaldehyde aqueous solution and distilled water is 2:2:5, mix melamine, 37% formaldehyde aqueous solution and distilled water uniformly, adjust the pH value to 7.8 with sodium hydroxide solution, heat to 75℃, and keep the reaction for 2 hours; after the reaction is completed, cool to room temperature to obtain melamine urea-formaldehyde resin prepolymer solution;

[0056] V. Inner layer capsule wall preparation: the polyurethane prepolymer prepared in step III is added to the emulsion prepared in step II, the reaction temperature is controlled at 75℃, the reaction time is 1 hour, under stirring conditions, toluene diisocyanate and polyethylene glycol undergo interfacial polymerization to form a polyurethane inner layer capsule wall;

[0057] VI. Outer layer capsule wall preparation: the melamine urea-formaldehyde resin prepolymer solution prepared in step IV is added dropwise to the emulsion containing the polyurethane inner layer capsule wall, the PH is adjusted to 5.5 with ammonium sulfate, the resin is deposited on the surface of the polyurethane inner layer to form an outer layer capsule wall, the reaction temperature is controlled at 75℃, the reaction time is 2.5 hours, after the reaction is completed, it is cooled to room temperature, centrifuged or filtered, and sequentially washed with distilled water and ethanol to remove surface residues, and dried at 40℃ to obtain double-shell phase change material microcapsules.

[0058] The application of the above-mentioned intelligent temperature-regulating spunlace non-woven fabric on the paper diaper is to apply the intelligent temperature-regulating spunlace non-woven fabric on the upper layer of the paper diaper core.

[0059] In the case that the enthalpy value of the intelligent temperature-regulating fiber is 20J / g and the grammage of the intelligent temperature-regulating spunlace non-woven fabric is 40gsm, the intelligent temperature-regulating spunlace non-woven fabric can be applied on the upper layer of the paper diaper core, and the single-layer intelligent temperature-regulating spunlace non-woven fabric can be applied on the part close to the skin.

[0060] Example 3

[0061] A preparation method of an intelligent temperature-regulating spunlace non-woven fabric, comprising the following steps:

[0062] S1. Add the double-shell phase change material microcapsules to the viscose solution, mix uniformly to obtain a first mixed solution, and extrude the first mixed solution through a spinneret to form intelligent temperature-regulating fibers; the enthalpy value of the intelligent temperature-regulating fiber is 35J / g, and the denier of the intelligent temperature-regulating fiber is 3D;

[0063] S2. According to the proportion of 7:3 of the intelligent temperature-regulating fiber and polyester, the intelligent temperature-regulating fiber and polyester are blended, and an intelligent temperature-regulating spunlace non-woven fabric is prepared through a spunlace production process; the grammage of the intelligent temperature-regulating spunlace non-woven fabric is 45gsm;

[0064] The preparation process of the double-shell phase change material microcapsules is as follows:

[0065] I, raw material selection: including 20 parts by weight of phase change material, 2 parts by weight of phase change agent, 5 parts by weight of emulsifier, 0.4 parts by weight of initiator and 65 parts by weight of distilled water; the phase change material is a mixture of n-octadecane, n-eicosane and polyethylene glycol in any ratio and mixture, the phase change agent is polyethylene glycol, the emulsifier is Tween-20, and the initiator is azobisisobutyronitrile;

[0066] The amount of the phase change agent is 10% of the phase change material, and the amount of the initiator is 2% of the phase change material;

[0067] II, mix the phase change material and the phase change agent, heat to completely melt the phase change material, then add the emulsifier, the initiator and the distilled water, stir uniformly to form a stable emulsion;

[0068] III, preparation of polyurethane prepolymer: under nitrogen protection, melt toluene diisocyanate; heat polyoxypropylene glycol to 115℃, vacuum dewatering to water content less than 0.1%; then add polyoxypropylene glycol to toluene diisocyanate at a molar ratio of -NCO in toluene diisocyanate to -OH in polyoxypropylene glycol of 3:1, control the reaction temperature at 90℃, determine the concentration of -NCO group by di-n-butylamine method, when the reaction degree reaches 50%, it is considered as the reaction endpoint, after the reaction is completed, cool to room temperature to obtain polyurethane prepolymer;

[0069] IV, preparation of melamine urea-formaldehyde resin prepolymer: according to the mass ratio of melamine, 37% formaldehyde aqueous solution and distilled water of 2:2:5, mix melamine, 37% formaldehyde aqueous solution and distilled water uniformly, adjust the pH value to 8.0 with sodium hydroxide solution, heat to 80℃, keep the reaction for 2 hours, after the reaction is completed, cool to room temperature to obtain melamine urea-formaldehyde resin prepolymer solution;

[0070] V, preparation of inner layer capsule wall: add the polyurethane prepolymer obtained by step III to the emulsion obtained by step II, control the reaction temperature at 80℃, the reaction time is 2 hours, under stirring condition, toluene diisocyanate and polyethylene glycol occur interfacial polymerization reaction to form polyurethane inner layer capsule wall;

[0071] VI, preparation of outer layer capsule wall: add the melamine urea-formaldehyde resin prepolymer solution obtained by step IV dropwise to the emulsion containing polyurethane inner layer capsule wall, adjust the pH to 6.0 with ammonium sulfate, make the resin deposit on the surface of the polyurethane inner layer to form the outer layer capsule wall, control the reaction temperature at 80℃, the reaction time is 3 hours, after the reaction is completed, cool to room temperature, centrifuge or filter treatment, wash with distilled water and ethanol in turn to remove surface residues, dry at 40℃ to obtain double-shell phase change material microcapsules.

[0072] The application of the intelligent temperature-adjusting spunlace non-woven fabric on the paper diaper is to apply the intelligent temperature-adjusting spunlace non-woven fabric to the lower layer of the core body of the paper diaper to obtain a paper diaper product containing temperature-adjusting material.

[0073] The grammage of the intelligent temperature-adjusting spunlace non-woven fabric is 45 gsm. In the case of higher grammage, the intelligent temperature-adjusting spunlace non-woven fabric is suitable to be applied to the lower layer of the core body of the paper diaper.

[0074] Comparative Example 1

[0075] The difference from Example 1 is that in step S1, no double-shell phase change material microcapsules are added to the viscose solution; instead, the viscose solution is extruded through a spinneret to form viscose fibers, which are then blended with polyester fibers, and a conventional viscose-polyester spunlace non-woven fabric is formed through the spunlace production process. The other technical solutions are the same as those in Example 1.

[0076] The conventional viscose-polyester spunlace non-woven fabric is applied to the upper layer of the core body of the paper diaper to obtain a conventional paper diaper product.

[0077] Comparative Example 2

[0078] The difference from Example 1 is that in step S1, no double-shell phase change material microcapsules are added to the viscose solution; instead, lyocell solution is added to the viscose solution, which is extruded through a spinneret, and a conventional viscose-lyocell spunlace non-woven fabric is formed through the spunlace production process.

[0079] The intelligent temperature-adjusting spunlace non-woven fabrics obtained in Example 1, Comparative Example 1, and Comparative Example 2 are placed in a constant temperature and humidity chamber equipped with a temperature sensor for temperature comparison testing. The temperature of the constant temperature and humidity chamber is increased from 10℃ to 40℃. The maximum temperature difference between the intelligent temperature-adjusting spunlace non-woven fabric and the conventional viscose-polyester spunlace non-woven fabric is 3.2℃, and the maximum temperature difference between the intelligent temperature-adjusting spunlace non-woven fabric and the conventional viscose-lyocell spunlace non-woven fabric is 5.3℃. That is, when the external temperature rises, the intelligent temperature-adjusting spunlace non-woven fabric can adjust the temperature, and the temperature rise is smaller than that of the comparative samples. When the temperature of the constant temperature and humidity chamber is decreased from 40℃ to 10℃, the maximum temperature difference between the intelligent temperature-adjusting spunlace non-woven fabric and the conventional viscose-polyester spunlace non-woven fabric is 1.5℃, and the maximum temperature difference between the intelligent temperature-adjusting spunlace non-woven fabric and the conventional viscose-lyocell spunlace non-woven fabric is 2.8℃. That is, when the external temperature decreases, the intelligent temperature-adjusting spunlace non-woven fabric can adjust the temperature, and the temperature drop is smaller than that of the comparative samples.

[0080] The paper diaper product containing temperature-adjusting material obtained in Example 1 and the conventional paper diaper product obtained in Comparative Example 1 are tested and verified. It is evaluated that the paper diaper product containing temperature-adjusting material obtained by the technical solution has similar internal performance to the conventional paper diaper product.

[0081] The finished product of the paper diaper containing the temperature adjusting material and the conventional finished product of the paper diaper are put into a constant temperature and humidity chamber provided with a temperature sensor to conduct a temperature comparison test. The temperature of the constant temperature and humidity chamber is increased from 10℃ to 40℃, and the maximum temperature difference between the two is 5.1℃. When the temperature of the constant temperature and humidity chamber is decreased from 40℃ to 10℃, the maximum temperature difference between the two is 1.2℃. From the temperature comparison test results, the finished product of the paper diaper containing the temperature adjusting material has a temperature adjusting effect. When the ambient temperature rises, the temperature of the finished product of the paper diaper containing the temperature adjusting material rises slowly. Conversely, when the ambient temperature decreases, the temperature decreases slowly.

[0082] Although the present application has been particularly shown and described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application as defined in the appended claims.

Claims

1. A method for preparing an intelligent temperature-regulating hydroentangled nonwoven fabric, characterized by, The method comprises the following steps: S1, adding double-shell phase change material microcapsules into a spinning polymer solution, obtaining a first mixed solution after uniform mixing, and extruding the first mixed solution through a spinneret to form intelligent temperature-regulating fibers; S2, mixing the intelligent temperature-regulating fibers and base fibers according to a ratio of 5-7:3-5, and preparing intelligent temperature-regulating spunlace nonwoven fabric through a spunlace production process; The preparation process of the double-shell phase change material microcapsules is as follows: I, selection of raw materials: 15-20 parts by weight of phase change materials, 1-5 parts by weight of phase change additives, 1-5 parts by weight of emulsifiers, 0.1-1 parts by weight of initiators, and 60-65 parts by weight of distilled water; the phase change material is a mixture of one or more of n-octadecane, n-eicosane and polyethylene glycol in any ratio and mixture, the phase change additive is polyethylene glycol, the emulsifier is Tween-20, and the initiator is azobisisobutyronitrile; II, mix the phase change material and phase change additive, heat to completely melt the phase change material, then add the emulsifier, initiator and distilled water, stir uniformly to form a stable emulsion; the mass fraction of the phase change material in the emulsion is 10%-30%; III, preparation of polyurethane prepolymer: under nitrogen protection, melt toluene diisocyanate; heat polyoxypropylene glycol to 110-115 DEG C, vacuum dewatering to a water content of less than 0.1%; then, according to the molar ratio of -NCO in toluene diisocyanate to -OH in polyoxypropylene glycol is (0.5-3):1, add polyoxypropylene glycol to toluene diisocyanate, control the reaction temperature at 55-90 DEG C, determine the concentration of -NCO group by using di-n-butylamine method, when the reaction degree reaches 50%, it is considered as the reaction endpoint, after the reaction is completed, cool to room temperature to obtain polyurethane prepolymer; IV, preparation of melamine-urea-formaldehyde resin prepolymer: according to the mass ratio of melamine, 37% formaldehyde aqueous solution and distilled water is 2:2:5, mix melamine, 37% formaldehyde aqueous solution and distilled water uniformly, adjust the pH value to 7.5-8.0 with sodium hydroxide solution, heat to 70-80 DEG C, and keep the reaction for 2 hours, after the reaction is completed, cool to room temperature to obtain melamine-urea-formaldehyde resin prepolymer solution; V, preparation of inner layer capsule wall: add the polyurethane prepolymer prepared in step III to the emulsion prepared in step II, control the reaction temperature at 65-80 DEG C, and the reaction time is 1-2 hours, under stirring, toluene diisocyanate and polyethylene glycol occur interface polymerization reaction to form polyurethane inner layer capsule wall; VI. Preparation of the outer shell wall: the melamine urea-formaldehyde resin prepolymer solution prepared in step IV is added dropwise into the emulsion containing the polyurethane inner shell wall, ammonium sulfate is used to adjust the pH to 5.0-6.0, the resin is deposited on the surface of the polyurethane inner shell, forming the outer shell wall, the reaction temperature is controlled at 65-80℃, the reaction time is 2-3 hours, after the reaction is completed, it is cooled to room temperature, centrifuged or filtered, washed with distilled water and ethanol in sequence to remove the surface residues, dried at 40℃ to obtain the double-shell phase change material microcapsules.

2. The preparation method of the intelligent temperature-regulating spunlace nonwoven fabric according to claim 1, characterized in that: The grammage of the intelligent temperature-regulating spunlace nonwoven fabric is 24-60 gsm.

3. The method for preparing the intelligent temperature-regulating spunlace nonwoven fabric according to claim 1, characterized in that: The enthalpy of the intelligent temperature-regulating fiber is 6-45 J / g.

4. The preparation method of the intelligent temperature-regulating spunlace nonwoven fabric according to claim 1, characterized in that: The denier of the intelligent temperature-regulating fiber is 1-6 D.

5. The method of claim 1, wherein the method is characterized by: The amount of the phase change auxiliary agent is 2%-10% of the phase change material, and the amount of the initiator is 0.5%-2% of the phase change material.

6. The method of claim 1, wherein the method is characterized by: In step S1, the spinning polymer solution is a viscose solution or a lyocell solution.

7. The method of claim 1, wherein the method further comprises the step of: In step S2, the base fiber is a polypropylene fiber or a polyester fiber. ​ 8. The use of the intelligent temperature-regulating spunlace nonwoven fabric according to claim 1 on a paper diaper, characterized in that: The intelligent temperature-regulating spunlace nonwoven fabric is applied to the upper layer or the lower layer or both of the core of a paper diaper.

9. The use of the intelligent temperature-regulating spunlace nonwoven fabric according to claim 1 on a paper diaper, characterized in that: The intelligent temperature-regulating spunlace nonwoven fabric is applied to the surface layer or the flow guide layer of a paper diaper.