Thermochromic printed non-woven fabric, preparation method thereof and application of thermochromic printed non-woven fabric to paper diapers

Abstract

The invention relates to the field of hygienic products, provides a thermochromic printed non-woven fabric, a preparation method thereof and application of the thermochromic printed non-woven fabric to paper diapers, and solves the problems that existing paper diapers do not have a thermochromic function, are dull in vision, are insufficient in fashion sense and interestingness and are insufficient to attract attention of babies. Comprising a non-woven fabric base material and microcapsule temperature change powder, and the microcapsule temperature change powder comprises the following raw materials: an organic thermochromic material, titanium dioxide, a hydroxyl compound, a polar solvent, n-docosanol and p-benzene methanesulfonic acid; the preparation process of the microcapsule temperature change powder comprises the following steps: 1) preparing the temperature change powder; (2) synthesizing a prepolymer; (3) preparing an emulsion; and 4) preparing the microcapsule temperature change powder.

Description

Technical Field

[0001] The invention relates to the field of sanitary products, and in particular to a thermochromic printed nonwoven fabric, a preparation method thereof, and application of the nonwoven fabric in diapers. Background Art

[0002] Most existing diaper products use non-woven materials without printing. The overall product design is relatively plain, monotonous, lacks creativity, and lacks visual impact, which cannot attract consumers' attention immediately. Although some diapers on the market use printed bottom film non-woven fabrics or waist non-woven fabrics, which improve the appearance of diapers to a certain extent, they still lack interest and novelty, and do not make diapers look more vivid and interesting.

[0003] Chinese patent application No. 201920262825.9 discloses a new type of skirt diaper, including a trouser-shaped absorbent and a skirt body, the longitudinal ends of the trouser-shaped absorbent are respectively connected to the skirt body, the lateral sides of the skirt body are integrally formed by hot pressing, the front middle part of the front end of the skirt body is provided with a front skirt door and a rear skirt door, the skirt body is provided with a non-permeable material layer, the trouser-shaped absorbent is provided with a water-absorbing surface layer, a core body and a water-repellent surface layer in sequence from top to bottom, and a plurality of elastic bands are provided laterally between the non-permeable material layer corresponding to the waist and waist of the skirt body and the water-repellent surface layer of the trouser-shaped absorbent, and the elastic bands corresponding to the two sides of the waist and the entire waist of the skirt body are bonded by glue. The design of the diaper takes into account the diverse needs of consumers, increases the fashion sense of the diaper and the fun of infants when using it. However, the diaper does not have the function of temperature-sensitive color change.

[0004] Chinese patent application No. 202210626995.7 discloses a method for large-area printing of diaper bottom film, wherein 50%-80% screen grayscale screen printing is adopted during printing; the number of anilox rollers for the screen printing is 300l / cm-400l / cm. The method of the invention changes large-area solid printing to screen printing through front-end color separation design, and adjusts the ink formula and the number of anilox rollers. The large-area printing method of the diaper bottom film of the invention not only meets the customer's design intentions and the depth of the color of the design, but also reduces the impact of large-area printing on the product's moisture permeability, so as to ensure that the key physical properties of the diaper bottom film (moisture permeability) meet the use requirements. However, the diaper does not have the function of thermochromic change and still lacks interest. Summary of the invention

[0005] Therefore, in response to the above problems, the present invention provides a thermochromic printed non-woven fabric, a preparation method thereof, and an application in diapers, to solve the problem that existing diapers do not have a thermochromic function, are visually monotonous, lack fashion sense and interest, and are not enough to attract the baby's attention.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A thermochromic printed nonwoven fabric comprises a nonwoven fabric substrate and a microcapsule thermochromic powder, wherein the microcapsule thermochromic powder comprises the following raw materials: an organic thermochromic material, titanium dioxide, a hydroxyl compound, a polar solvent, n-dodecyl alcohol and p-toluenesulfonic acid; the preparation process of the microcapsule thermochromic powder is as follows:

[0008] S1. Preparation of thermochromic powder: according to the mass ratio of organic thermochromic material, titanium dioxide, hydroxyl compound, polar solvent, n-docosanol and p-toluenesulfonic acid of 1:0.05-0.4:4-8:40-70:0.2-0.4:0.01-0.05, the organic thermochromic material, titanium dioxide, hydroxyl compound and polar solvent are mixed, and after ultrasonic dispersion treatment, the mixture is heated to 100-110°C, and the n-docosanol and p-toluenesulfonic acid are added, and the mixture is stirred for 10-12 hours and then dried to obtain a thermochromic powder;

[0009] S2. Synthesis of prepolymer: 5-15 parts by weight of an amino compound, 25-50 parts by weight of a formaldehyde solution and 0.1-0.5 parts by weight of a thermochromic powder are mixed, the pH value is adjusted to 8-10, the temperature is increased to 55-75° C., and stirred to obtain a prepolymer solution;

[0010] S3, preparation of emulsion: heat and melt 5-15 parts by weight of n-octadecane, mix with 0.5-0.9 parts by weight of thermochromic powder and 1-10 parts by weight of emulsifier, stir and emulsify at pH 4-6 and temperature 55-65° C. for 30-45 minutes to obtain an emulsion;

[0011] S4, preparation of microcapsule temperature-changing powder: adding the prepolymer solution prepared in step S2 to the emulsion obtained in step S3, after standing for 2-4 hours, adjusting the pH to 8-9 to obtain a microcapsule suspension, filtering the microcapsule suspension, washing the filter cake with a 30% hot ethanol solution for 3-5 times, then washing with hot distilled water for 3-5 times, and drying at 45-50° C. to obtain a microcapsule temperature-changing powder.

[0012] Among them, the organic thermochromic material is a mixture of one or more of triarylmethane dyes, fluorane dyes, spiropyran dyes, and pyridine dyes in any proportion, and the triarylmethane dye includes a mixture of one or more of crystal violet lactone, basic blue 26, fuchsin, Congo red, malachite green, phenol violet or methyl violet in any proportion.

[0013] Furthermore, the color changing temperature range of the thermochromic printed nonwoven fabric is -15°C to 70°C.

[0014] Furthermore, the color change temperature range of the thermochromic printed non-woven fabric includes low-temperature color change, tactile color change and high-temperature color change. The low-temperature color change temperature is 5°C, 10°C or 15°C, the tactile color change temperature is 28°C, 33°C or 35°C, and the high-temperature color change temperature is 50°C, 60°C or 70°C.

[0015] Furthermore, the thermochromic printed nonwoven fabric has two-stage color change, three-stage color change or multi-stage color change, wherein the two-stage color change is 2 color changes, the three-stage color change is 3 color changes, and the multi-stage color change is more than 3 color changes.

[0016] Furthermore, the nonwoven fabric substrate is any one of hot air nonwoven fabric, spunbond nonwoven fabric or spunlace nonwoven fabric.

[0017] Furthermore, the hydroxy compound is any one of bisphenol A, bisphenol F, and phenylethyl p-hydroxyphenylacetate, the polar solvent is one or a mixture of any proportion of dodecanol, tetradecanol, hexadecanol, and octadecyl alcohol, the amino compound is urea, and the emulsifier is polyoxyethylene ether.

[0018] A method for preparing a thermochromic printed nonwoven fabric comprises the steps of mixing the microcapsule temperature-changing powder with ink and spraying or printing the mixture on a nonwoven fabric substrate to obtain the thermochromic printed nonwoven fabric.

[0019] Furthermore, the microcapsule temperature-changing powder is mixed with non-woven fabric particles, melted, extruded, spun, cooled, and pulled in a twin-screw extruder to obtain a fiber web, and the fiber web is hot-rolled into cloth to obtain the thermochromic printed non-woven fabric.

[0020] The invention discloses an application of a thermochromic printed nonwoven fabric on diapers. The thermochromic printed nonwoven fabric is applied to a bottom film nonwoven fabric of opening and closing pants, a waist nonwoven fabric of pull-up pants, or any material containing nonwoven fabric on diapers.

[0021] Thermochromic materials are a type of microcapsule material that is known to change color repeatedly as the temperature rises or falls. Thermochromic materials are prepared from an electron transfer type organic compound system. Electron transfer type organic compounds are a type of organic color system with a special chemical structure. At a specific temperature, the molecular structure of the organic compound can change due to electron transfer, and the color can be repeatedly changed as the temperature rises or falls, thereby achieving color change; Thermochromic materials have fifteen basic colors, which can achieve "colored to colorless", "colorless to colored" and "changes between different colors". The color change range can be set from -15℃ to 70℃, and different temperature ranges can be completed due to different needs of various products.

[0022] By adopting the above technical solution, the beneficial effects of the present invention are:

[0023] 1. The microcapsule temperature-change powder prepared in the present application has good thermal sensitivity and high sensitivity. It can achieve color change in a smaller temperature range, with obvious color change and good stability. It can be used in temperature-change ink with good compatibility.

[0024] 2. Select high-quality electron transfer organic compounds (i.e., the organic thermochromic material uses a mixture of one or more of triarylmethane dyes, fluorane dyes, spiropyran dyes, and pyridine dyes in any proportion as the color-changing substance, and the triarylmethane dyes include a mixture of one or more of crystal violet lactone, fuchsin, malachite green, and methyl violet in any proportion), and match with a suitable color developer (bisphenol A, bisphenol F or phenylethyl p-hydroxyphenylacetate), a suitable solvent (dodecanol, tetradecanol, hexadecanol or octadecyl alcohol), adjust the optimal ratio between the components, and prepare a microcapsule temperature-changing powder with excellent performance. The difference from the traditional temperature-sensitive color-changing material is that the technical solution of the present application can realize three-stage color change or multi-stage color change of the temperature-changing powder.

[0025] 3. Since the organic thermochromic materials all contain methane molecules, the hydrogen in the methane molecules is replaced by benzene or naphthalene to form a color-emitting structure. Figure 1 When the crystal violet lactone is at a low temperature, the electron donor in the crystal violet lactone molecule transfers electrons to the electron acceptor (bisphenol A releases protons, that is, obtains electrons), the crystal violet lactone ring opens, the molecules rearrange, the conjugated double bonds penetrate and combine with the bisphenol A ions, so that the compound appears blue; and as the temperature rises, the solvent melts, the electron donor retains electrons, the molecular structure changes, a conjugated system is formed, the color changes, and a reversible thermochromic phenomenon occurs.

[0026] 4. The polar solvents used in this technical application are: lauryl alcohol (dodecyl alcohol, color change temperature 7-14°C), myristyl alcohol (tetradecanol, color change temperature 26-13°C), cetyl alcohol (hexadecanol, color change temperature 35-40°C), stearyl alcohol (octadecyl alcohol, color change temperature 39-45°C), and the color change temperature is controlled by different types of alcohols and is selected according to the required temperature. In this application, polar solvents such as methanol and ethanol are avoided to prevent the internal environment of the microcapsule from being affected by the penetration effect, thereby affecting the color change performance.

[0027] 5. The thermochromic printed non-woven fabric is applied to the bottom non-woven fabric of the open-and-close pants, the waist non-woven fabric of the pull-up pants, or any non-woven fabric-containing material on the diaper. The thermochromic print can be printed on the entire non-woven fabric material or on a local area. Different color changes or color change temperatures are designed according to different areas of the diaper, or thermochromic printed non-woven fabrics with different temperatures are customized according to the season. The material changes color through changes in human body temperature, hand touch, or ambient temperature. It is visually colorful and has a strong visual impact. It can not only enhance the appearance of the diaper, increase creativity and fun, but also attract the baby's attention, increase the interaction between parents and babies, and win the favor of consumers. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the reversible color change reaction of crystal violet lactone in the specification of the present invention;

[0029] Figure 2 This is a color change diagram of the thermochromic printed nonwoven fabric in Example 1 of the present invention. DETAILED DESCRIPTION

[0030] Example 1

[0031] A thermochromic printing nonwoven fabric comprises a nonwoven fabric substrate and a microcapsule temperature-changing powder, wherein the nonwoven fabric substrate is a hot air nonwoven fabric, and the microcapsule temperature-changing powder comprises the following raw materials: crystal violet lactone, titanium dioxide, bisphenol A, hexadecanol, docosyl alcohol and p-toluenesulfonic acid; the preparation process of the microcapsule temperature-changing powder is as follows:

[0032] S1. Preparation of thermochromic powder: according to the mass ratio of crystal violet lactone, titanium dioxide, bisphenol A, hexadecanol, n-docosanol and p-toluenesulfonic acid of 1:0.05:4:40:0.2:0.01, triarylmethane dye, titanium dioxide, bisphenol A and polar solvent are mixed, and after ultrasonic dispersion treatment, the mixture is heated to 100° C., n-docosanol and p-toluenesulfonic acid are added, and the mixture is stirred for 10 hours and then dried to obtain thermochromic powder;

[0033] S2. Synthesis of prepolymer: 5 parts by weight of urea, 25 parts by weight of formaldehyde solution and 0.1 parts by weight of thermochromic powder are mixed, the pH value is adjusted to 8, the temperature is increased to 55° C., and stirred to obtain a prepolymer solution;

[0034] S3, preparation of emulsion: 5 parts by weight of n-octadecane was heated and melted, mixed with 0.5 parts by weight of thermochromic powder and 1 part by weight of polyoxyethylene ether, and stirred and emulsified at pH 4 and temperature 55° C. for 30 minutes to obtain an emulsion;

[0035] S4. Preparation of microcapsule temperature-changing powder: adding the prepolymer solution prepared in step S2 to the emulsion obtained in step S3, and after standing for 2 hours, adjusting the pH to 8 to obtain a microcapsule suspension. After filtering the microcapsule suspension, the filter cake is washed three times with a hot ethanol solution having a concentration of 30%, and then washed three times with hot distilled water, and dried at 45° C. to obtain a microcapsule temperature-changing powder.

[0036] like Figure 2 As shown, the preparation method of the thermochromic printed non-woven fabric is as follows: the microcapsule temperature-changing powder is mixed with ink and then sprayed on a non-woven fabric substrate to obtain the thermochromic printed non-woven fabric. The color change temperature of the thermochromic printed non-woven fabric is 33°C, and the thermochromic printed non-woven fabric is a two-stage color change. When the temperature is lower than 33°C, the color of the thermochromic printed non-woven fabric is purple, and when the temperature is higher than 33°C, the color of the thermochromic printed non-woven fabric is blue.

[0037] The crystal violet lactone is light yellow to white powder or crystal, and is colorless when dissolved in a polar solvent (hexadecanol). When the temperature is below 33°C, bisphenol A releases protons, and the crystal violet lactone opens the ring and rearranges, showing purple; when the temperature rises, that is, above 33°C, bisphenol A binds protons, the molecular structure changes, and the color changes to blue.

[0038] The application of the thermochromic printed nonwoven fabric on diapers is to apply the thermochromic printed nonwoven fabric on the bottom film nonwoven fabric of open-close pants.

[0039] Example 2

[0040] A thermochromic printing nonwoven fabric comprises a nonwoven fabric substrate and a microcapsule temperature-changing powder, wherein the nonwoven fabric substrate is a spunbonded nonwoven fabric, and the microcapsule temperature-changing powder comprises the following raw materials: triarylmethane dyes, titanium dioxide, bisphenol F, octadecanol, n-docosanol and p-toluenesulfonic acid; the triarylmethane dyes are a mixture of crystal violet lactone and Congo red in any proportion; the preparation process of the microcapsule temperature-changing powder is as follows:

[0041] S1. Preparation of thermochromic powder: According to the mass ratio of triarylmethane dye, titanium dioxide, bisphenol A, octadecyl alcohol, n-docosanol and p-toluenesulfonic acid of 1:0.1:5:50:0.3:0.03, crystal violet lactone, titanium dioxide, bisphenol A and polar solvent are mixed, and after ultrasonic dispersion treatment, the mixture is heated to 105° C., n-docosanol and p-toluenesulfonic acid are added, and the mixture is stirred for 11 hours and then dried to obtain a thermochromic powder;

[0042] S2. Synthesis of prepolymer: 10 parts by weight of urea, 28 parts by weight of formaldehyde solution and 0.3 parts by weight of thermochromic powder are mixed, the pH value is adjusted to 9, the temperature is increased to 60° C., and stirred to obtain a prepolymer solution;

[0043] S3, preparation of emulsion: 10 parts by weight of n-octadecane was heated and melted, and then mixed with 0.6 parts by weight of thermochromic powder and polyoxyethylene ether, and stirred and emulsified for 35 minutes at a pH of 5 and a temperature of 60° C. to obtain an emulsion;

[0044] S4. Preparation of microcapsule temperature-changing powder: adding the prepolymer solution prepared in step S2 to the emulsion obtained in step S3, and after standing for 3 hours, adjusting the pH to 8.5 to obtain a microcapsule suspension. After filtering the microcapsule suspension, the filter cake is washed three times with a hot ethanol solution having a concentration of 30%, and then washed three times with hot distilled water, and dried at 48° C. to obtain a microcapsule temperature-changing powder.

[0045] The preparation method of the thermochromic printed non-woven fabric comprises the following steps: mixing the microcapsule temperature-changing powder with ink and then printing the mixture on a non-woven fabric substrate to obtain the thermochromic printed non-woven fabric, wherein the color change temperature of the thermochromic printed non-woven fabric is 33°C and 40°C, and the thermochromic printed non-woven fabric changes color in three stages. When the temperature is below 30°C, the color of the thermochromic printed non-woven fabric is purple, the color of the thermochromic printed non-woven fabric between 30°C and 40°C is red, and the color of the thermochromic printed non-woven fabric above 40°C gradually becomes lighter.

[0046] The application of the thermochromic printed nonwoven fabric on diapers is to apply the thermochromic printed nonwoven fabric on the waist nonwoven fabric of pull-up pants.

[0047] Example 3

[0048] A thermochromic printing nonwoven fabric comprises a nonwoven fabric substrate and a microcapsule temperature-changing powder, wherein the nonwoven fabric substrate is a spunlace nonwoven fabric, and the microcapsule temperature-changing powder comprises the following raw materials: triarylmethane dyes, titanium dioxide, phenylethyl p-hydroxyphenylacetate, tetradecanol, n-docosanol and p-toluenesulfonic acid; the triarylmethane dyes are a mixture of crystal violet lactone and fuchsin in any proportion; the preparation process of the microcapsule temperature-changing powder is:

[0049] S1. Preparation of thermochromic powder: according to the mass ratio of organic thermochromic material, titanium dioxide, bisphenol A, tetradecanol, docosyl alcohol and p-toluenesulfonic acid of 1:0.4:8:70:0.4:0.05, the organic thermochromic material, titanium dioxide, bisphenol A and polar solvent are mixed, and after ultrasonic dispersion treatment, the mixture is heated to 110° C., the docosyl alcohol and p-toluenesulfonic acid are added, and the mixture is stirred for 12 hours and then dried to obtain a thermochromic powder;

[0050] S2. Synthesis of prepolymer: 15 parts by weight of urea, 50 parts by weight of formaldehyde solution and 0.5 parts by weight of thermochromic powder are mixed, the pH value is adjusted to 10, the temperature is increased to 75° C., and stirred to obtain a prepolymer solution;

[0051] S3, preparation of emulsion: 15 parts by weight of n-octadecane was heated and melted, and then mixed with 0.9 parts by weight of thermochromic powder and polyoxyethylene ether, and stirred and emulsified at pH 6 and temperature 65° C. for 45 minutes to obtain an emulsion;

[0052] S4. Preparation of microcapsule temperature-changing powder: adding the prepolymer solution prepared in step S2 to the emulsion obtained in step S3, and after standing for 4 hours, adjusting the pH to 9 to obtain a microcapsule suspension. After filtering the microcapsule suspension, washing the filter cake with a 30% hot ethanol solution for 3 times, and then washing with hot distilled water for 3 times, and drying at 50° C. to obtain a microcapsule temperature-changing powder.

[0053] The preparation method of the thermochromic printed nonwoven fabric comprises the following steps: mixing the microcapsule thermochromic powder with nonwoven fabric particles, melting, extruding, spinning, cooling, and pulling in a twin-screw extruder to obtain a fiber web, and hot-rolling the fiber web into a cloth to obtain the thermochromic printed nonwoven fabric. The color change temperature of the thermochromic printed nonwoven fabric is 33°C, 40°C, and 50°C. The thermochromic printed nonwoven fabric is multi-stage color change. When the temperature is below 33°C, the color of the thermochromic printed nonwoven fabric is purple, the color of the thermochromic printed nonwoven fabric is red at 30-40°C, the color of the thermochromic printed nonwoven fabric is light pink at 40-50°C, and the color of the thermochromic printed nonwoven fabric gradually becomes lighter at temperatures above 50°C.

[0054] The application of the thermochromic printed nonwoven fabric on diapers is to apply the thermochromic printed nonwoven fabric on any material containing nonwoven fabric on the diapers.

[0055] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A thermochromic printed nonwoven fabric, characterized in that: The invention comprises a non-woven fabric substrate and a microcapsule temperature-changing powder, wherein the microcapsule temperature-changing powder comprises the following raw materials: an organic thermochromic material, titanium dioxide, a hydroxyl compound, a polar solvent, n-dodecyl alcohol and p-toluenesulfonic acid; the preparation process of the microcapsule temperature-changing powder is as follows: S1. Preparation of thermochromic powder: according to the mass ratio of organic thermochromic material, titanium dioxide, hydroxyl compound, polar solvent, n-docosanol and p-toluenesulfonic acid of 1:0.05-0.4:4-8:40-70:0.2-0.4:0.01-0.05, the organic thermochromic material, titanium dioxide, hydroxyl compound and polar solvent are mixed, and after ultrasonic dispersion treatment, the mixture is heated to 100-110°C, and the n-docosanol and p-toluenesulfonic acid are added, and the mixture is stirred for 10-12 hours and then dried to obtain a thermochromic powder; S2. Synthesis of prepolymer: 5-15 parts by weight of an amino compound, 25-50 parts by weight of a formaldehyde solution and 0.1-0.5 parts by weight of a thermochromic powder are mixed, the pH value is adjusted to 8-10, the temperature is increased to 55-75° C., and stirred to obtain a prepolymer solution; S3, preparation of emulsion: heat and melt 5-15 parts by weight of n-octadecane, mix with 0.5-0.9 parts by weight of thermochromic powder and 1-10 parts by weight of emulsifier, stir and emulsify at pH 4-6 and temperature 55-65° C. for 30-45 minutes to obtain an emulsion; S4, preparation of microcapsule temperature-changing powder: adding the prepolymer solution prepared in step S2 to the emulsion obtained in step S3, after standing for 2-4 hours, adjusting the pH to 8-9 to obtain a microcapsule suspension, filtering the microcapsule suspension, washing the filter cake with a 30% hot ethanol solution for 3-5 times, then washing with hot distilled water for 3-5 times, and drying at 45-50° C. to obtain a microcapsule temperature-changing powder. Among them, the organic thermochromic material is a mixture of one or more of triarylmethane dyes, fluorane dyes, spiropyran dyes, and pyridine dyes in any proportion, and the triarylmethane dye includes a mixture of one or more of crystal violet lactone, basic blue 26, fuchsin, Congo red, malachite green, phenol violet or methyl violet in any proportion.

2. A thermochromic printed nonwoven fabric according to claim 1, characterized in that: The color changing temperature range of the thermochromic printed nonwoven fabric is -15°C to 70°C.

3. The thermochromic printed nonwoven fabric according to claim 1, characterized in that: The color change temperature range of the thermochromic printed non-woven fabric includes low-temperature color change, hand-feel color change and high-temperature color change. The low-temperature color change temperature is 5°C, 10°C or 15°C, the hand-feel color change temperature is 28°C, 33°C or 35°C, and the high-temperature color change temperature is 50°C, 60°C or 70°C.

4. The thermochromic printed nonwoven fabric according to claim 1, characterized in that: The thermochromic printed nonwoven fabric has two-stage color change, three-stage color change or multi-stage color change. The two-stage color change is 2 color changes, the three-stage color change is 3 color changes, and the multi-stage color change is more than 3 color changes.

5. The thermochromic printed nonwoven fabric according to claim 1, characterized in that: The nonwoven fabric substrate is any one of hot air nonwoven fabric, spunbond nonwoven fabric or spunlace nonwoven fabric.

6. The thermochromic printed nonwoven fabric according to claim 1, characterized in that: The hydroxy compound is any one of bisphenol A, bisphenol F, and phenylethyl p-hydroxyphenylacetate; the polar solvent is one of dodecanol, tetradecanol, hexadecanol, and octadecyl alcohol, or a mixture of any proportion of the two or more thereof; the amino compound is urea; and the emulsifier is polyoxyethylene ether.

7. A method for preparing a thermochromic printed nonwoven fabric, characterized in that: The microcapsule temperature-changing powder is mixed with ink and then sprayed or printed on a non-woven fabric substrate to obtain the thermochromic printed non-woven fabric.

8. The method for preparing a thermochromic printed nonwoven fabric according to claim 7, characterized in that: The microcapsule temperature-changing powder is mixed with non-woven fabric particles, melted, extruded, spun, cooled, and pulled in a twin-screw extruder to obtain a fiber web, and the fiber web is hot-rolled into cloth to obtain the thermochromic printed non-woven fabric.

9. An application of the thermochromic printed nonwoven fabric according to claim 1 on diapers, characterized in that: The thermochromic printed nonwoven fabric is applied to the bottom film nonwoven fabric of opening and closing pants, the waist nonwoven fabric of pull-up pants, or any material containing nonwoven fabric on diapers.

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