CN112760813A - Hot-air cloth for diaper and preparation method thereof - Google Patents

Abstract

The invention belongs to the technical field of daily chemicals, and particularly relates to a hot-air cloth for a diaper and a preparation method thereof. The product developed by the invention comprises polypropylene fiber, graphene oxide and polyethylene resin; the graphene oxide is dispersed to form a monolithic layer structure and is bonded with polypropylene fibers through polyethylene resin; the mass ratio of the polypropylene fibers to the graphene oxide is 3: 1-5: 1; the dosage of the polyethylene resin is 5-10% of the mass of the graphene oxide. During preparation, firstly, mixing graphene oxide and polyethylene nanoparticles, carrying out heat preservation ball milling to obtain a ball grinding material, and then mixing and soaking the ball grinding material and a saturated sodium bicarbonate solution to obtain modified graphene oxide; and then uniformly mixing the polypropylene fiber and the modified graphene oxide, opening, carding, hot air sizing at the temperature of 120-150 ℃, cooling, and discharging to obtain the hot air cloth for the diaper. The product obtained by the invention not only has excellent bulkiness, but also can effectively prevent water from back permeating.

Description

Hot-air cloth for diaper and preparation method thereof

Technical Field

The invention belongs to the technical field of daily chemicals, and particularly relates to a hot-air cloth for a diaper and a preparation method thereof.

Background

The paper diaper is a liquid absorption and control system composed of multiple layers of non-woven fabric materials and can be divided into a surface layer, an absorption core layer, a bottom film, a separation edge and a flow guide layer according to the specific structure. The liquid absorption principle of the paper diaper is a process of meeting progressive liquid absorption by utilizing the functional matching of all layers of non-woven materials. When the artificial urine is poured into a paper diaper sample, the urine firstly contacts the surface layer material and is respectively diffused transversely and longitudinally along the non-woven material, then the liquid penetrates through the surface layer and flows to the diversion layer material, and finally the liquid is absorbed by the water-absorbing high molecules in the absorption core layer. The conventional absorption core body is formed by compounding fluff pulp and water-absorbing macromolecules, and the macromolecules are dispersed on the fluff pulp. After the artificial urine enters the absorption layer, the artificial urine contacts with the fluff pulp, and the fluff pulp rapidly absorbs and diffuses the urine through the capillary action of the fluff pulp. Then the macromolecule in the core body absorbs the artificial urine transmitted by the fluff pulp, and the fluff pulp is absorbed next time after being restored to a dry state. When the artificial urine continuously diffuses to the deep layer to reach the bottom film layer, the liquid molecules are retained in the paper diaper without leakage because the diameter of the liquid molecules is larger than that of the microporous film, and gas molecules with small diameter can diffuse to the outside, so that the air permeability of the paper diaper is improved. If just begin to add too much urine, panty-shape diapers can't in time absorb too much urine and make partial urine remain in the surface course and to the lateral diffusion, and the water repellent effect of preventing the edge leakage material of edge leakage this moment will hinder liquid further diffusion, and the edge leakage material of preventing edge leakage needs certain resistant hydrostatic pressure just can prevent that liquid from overflowing and take place the edge leakage phenomenon.

The raw material performance, the thickness and the structural compactness of the hot air non-woven fabric material and the like of the hot air non-woven fabric material have important influence on the water permeability of the surface layer. From microscopic analysis, the surface layer absorbs water molecules, and the mechanism of transferring artificial urine mainly has 3 forms: the direct absorption of water molecules by the fibers, the capillary effect of the gaps between the fibers, and the effect of water pressure forcing water molecules through the fabric voids. The first mode provides a relatively weak effect, while the second and third modes are the main water-permeable modes of the facing, since it is required that the facing be kept dry and synthetic fibers with low moisture absorption should be selected. The most common surface layer material in the market at present is a hot air or spun-bonded non-woven material, and the hot air non-woven material has a good space structure, so that liquid can pass through a plurality of wiggle L gaps to pass through the fabric in a tortuous and circuitous manner. The thickness of the hot air non-woven material is 3-5 times that of the hot rolling, spun-bonding and melt-blowing non-woven material under the same areal density, the gaps among fibers are increased due to a good spatial structure, and the liquid return channel is complicated due to a certain thickness and through holes, so that the liquid return can be prevented to a certain extent, and the liquid return amount is reduced.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the defects that the traditional hot-air cloth for the baby diapers adopts hydrophobic PP as a fiber source, and the functions of filling power and inhibiting liquid return seepage have technical bottlenecks and cannot be further improved, the hot-air cloth for the baby diapers and the preparation method thereof are provided.

The invention aims to provide a hot-air cloth for a diaper.

The above purpose of the invention is realized by the following technical scheme:

a hot-air cloth for a diaper comprises polypropylene fibers, graphene oxide and polyethylene resin;

the graphene oxide is dispersed to form a monolithic layer structure and is bonded with polypropylene fibers through polyethylene resin;

the term "monolithic layer structure" according to the invention means: the graphene oxide still maintains the layered structure of graphite, and after dispersion, the obtained sheets are separated from each other to form a structure;

the mass ratio of the polypropylene fibers to the graphene oxide is 3: 1-5: 1;

the dosage of the polyethylene resin is 5-10% of the mass of the graphene oxide.

Further, the length of the polypropylene fiber is 30-50mm, and the titer is 1.1-6.6 dtex.

Further, the graphene oxide is folded graphene oxide, and the folded graphene oxide is obtained by dispersing graphene oxide and water and then performing spray drying.

Further, the polypropylene fiber comprises the following raw materials in parts by weight: 80-100 parts of polypropylene resin, 5-10 parts of polyvinylidene fluoride resin and 5-10 parts of sepiolite.

The invention also aims to provide a preparation method of the hot-air cloth for the diaper.

The above purpose of the invention is realized by the following technical scheme:

a preparation method of a hot-air cloth for a diaper comprises the following specific preparation steps:

mixing polyethylene nano-particles accounting for 5-10% of the mass of graphene oxide with graphene oxide, pouring the mixture into a ball milling tank, and continuously performing ball milling for more than 56 hours at the temperature of 80-90 ℃ to obtain a ball grinding material;

according to the technical scheme, the graphene oxide and the polyethylene nanoparticles are mixed in the ball milling tank through ball milling, the graphene oxide is light in weight and large in specific surface area, the polyethylene nanoparticles can be adsorbed in the ball milling process, and the graphene oxide structure contains an oleophylic and hydrophobic graphene area which has good interface compatibility with the polyethylene nanoparticles, so that the polyethylene nanoparticles tend to be adsorbed and fixed at the area;

soaking the ball-milled material in a saturated sodium bicarbonate solution at the temperature of 40-45 ℃, cooling to 30-32 ℃, filtering, and carrying out vacuum freeze drying to obtain a dry filter cake;

according to the technical scheme, the ball-milling material is soaked in a saturated sodium bicarbonate solution, the sodium bicarbonate is ionized in the solution to enable the solution to be alkalescent, carboxyl at the edge region of a graphene oxide molecular structure can be ionized, and the edge carboxyl is ionized to carry the same negative charge, so that the distance between graphene oxide layers is increased due to electrostatic repulsion, and in the cooling process, part of the sodium bicarbonate is separated out in a crystal form and is adsorbed and fixed by the graphene oxide edge region;

according to the mass ratio of 3: 1-5: 1, uniformly mixing the polypropylene fiber and the dry filter cake, opening, carding, hot air setting at the temperature of 120-150 ℃, cooling, and discharging to obtain the hot air cloth for the diaper.

The technical proposal replaces the polypropylene fiber in large batch by the modified graphene oxide (namely the dry filter cake) as one of the components of the hot air cloth, in the process of processing products, when the products are shaped by hot air, the graphene has higher heat conductivity coefficient, so that heat can be quickly transferred inside, thereby melting the polyethylene nano-particles adsorbed and fixed in the graphene region of the graphene oxide, decomposing the sodium bicarbonate adsorbed and fixed in the edge region to generate carbon dioxide and water vapor, thereby leading the molten polyethylene to diffuse and permeate from the space between the graphene oxide layers, leading the graphene oxide to be stripped to form a monolithic layer structure in the diffusion and permeation process, bonding the polypropylene fibers and the graphene oxide through the polyethylene resin subjected to diffusion and permeation so as to construct the non-woven fabric continuously bonded by the polypropylene fibers and the graphene oxide;

because utilize the oxidation graphite alkene to replace polypropylene fiber in a large number, and oxidation graphite alkene matter is light, the surface is smooth, the stable performance, it is amazing to the skin, can effectively improve fluffy sense and the travelling comfort of hot-blast cloth, and "the bridge" between fibre and the fibre is constructed through oxidation graphite alkene, the collocation of this kind of fibre and sheet material can form moisture diffusion route, and compare in the unordered non-woven hot-blast cloth that arranges the formation of single fibre, the regional existence of sheet material, moisture can be blockked by it, can effectively avoid moisture to return and ooze.

Further, the specific preparation steps further include pretreatment of the graphene oxide before ball milling, and the pretreatment steps include:

mixing graphene oxide and water according to a mass ratio of 1: 5-1: 10 mixing and dispersing to obtain dispersion, and spray-drying the dispersion.

Further, the step of preprocessing further comprises: and adding sodium polystyrene sulfonate accounting for 1-3% of the mass of the graphene oxide in the graphene oxide and water dispersion process.

According to the technical scheme, the graphene oxide is subjected to spray drying pretreatment firstly, the originally flat surface of the graphene becomes wrinkled in the spray drying process, and further, after sodium polystyrene sulfonate is added, the sheet structure is easier to separate when the graphene oxide is dispersed in water, and meanwhile, the surface of each single-sheet graphene oxide can become wrinkled in the spray drying process, so that the fluffy feeling of the product can be effectively improved.

Further, the specific preparation steps further comprise the following steps:

according to the weight portion, 80-100 portions of polypropylene resin, 5-10 portions of polyvinylidene fluoride resin and 5-10 portions of sepiolite are taken in sequence, firstly, the polypropylene resin, the polyvinylidene fluoride resin and the sepiolite are mixed for 3-6 hours in a ball milling mode, then N-methyl pyrrolidone with the mass of 5-10% of the polyvinylidene fluoride resin is added, after the ball milling and mixing are continued for 3-6 hours, discharging, washing, drying and melt spinning are carried out.

According to the technical scheme, the polypropylene resin and the polyvinylidene fluoride resin are firstly mixed through ball milling, in the process, two different polymer molecular chains are mutually entangled, the solvent N-methyl pyrrolidone is introduced subsequently, in the process of continuing ball milling, a small amount of solvent N-methyl pyrrolidone can swell and unfold the polyvinylidene fluoride resin molecular chains, in the process of swelling and unfolding, the polypropylene resin molecular chains which cause entanglement also swell and unfold to a certain degree, so that the sepiolite is combined with two resin matrixes in the process of ball milling, the sepiolite is stably combined in the interior, in the process of using an actual product, the water is locked, the seepage return is prevented, and the loss of the sepiolite caused by a large amount of urine is avoided.

Detailed Description

The present invention is further illustrated by the following specific examples, which are not intended to limit the invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.

Unless otherwise indicated, reagents and materials used in the following examples are commercially available.

Example 1

A hot-air cloth for a diaper comprises polypropylene fibers, graphene oxide and polyethylene resin;

the graphene oxide is dispersed to form a monolithic layer structure and is bonded with polypropylene fibers through polyethylene resin;

the mass ratio of the polypropylene fibers to the graphene oxide is 3: 1;

the amount of the polyethylene resin is 5% of the mass of the graphene oxide;

the hot-air cloth for the diaper is prepared by the following steps:

according to the weight parts, 80 parts of polypropylene resin, 5 parts of polyvinylidene fluoride resin and 5 parts of sepiolite are sequentially taken, the polypropylene resin, the polyvinylidene fluoride resin and the sepiolite are firstly mixed and poured into a ball milling tank, and the weight ratio of ball materials is 20: adding zirconia ball milling beads, carrying out ball milling and mixing for 3h at the rotating speed of 300r/min, then adding N-methyl pyrrolidone with the mass of 5% of that of polyvinylidene fluoride resin, continuing ball milling and mixing for 3h, discharging, washing for 3 times by using deionized water, carrying out vacuum freeze drying to constant weight under the conditions that the temperature is-30 ℃ and the vacuum degree is 100Pa, obtaining a dry master batch, melting the dry master batch in a screw extruder, then extruding, and carrying out high-temperature melting and spinning to obtain polypropylene fibers; the polypropylene fiber is 30mm long and 1.1dtex denier;

mixing graphene oxide and water according to a mass ratio of 1: 5, mixing, adding sodium polystyrene sulfonate accounting for 1% of the mass of the graphene oxide, performing ultrasonic dispersion for 10min under the condition that the ultrasonic frequency is 50kHz to obtain dispersion liquid, and performing spray drying on the dispersion liquid under the conditions that the air inlet temperature is 140 ℃ and the air outlet temperature is 100 ℃ to obtain pretreated graphene oxide;

mixing the pretreated graphene oxide and polyethylene nanoparticles accounting for 5% of the mass of the pretreated graphene oxide, pouring the mixture into a ball milling tank, and mixing the mixture according to the mass ratio of 20: 1, adding zirconia ball grinding beads, and continuously carrying out ball grinding for 56 hours at the temperature of 80 ℃ and the ball grinding rotating speed of 400r/min to obtain a ball grinding material;

preparing a saturated sodium bicarbonate solution at the temperature of 40 ℃, adding ball milling materials with the mass of 0.05 time of that of the saturated sodium bicarbonate solution into the saturated sodium bicarbonate solution under the condition of heat preservation, stirring and mixing, preserving heat and soaking for 30min, cooling to 30 ℃, filtering, collecting a filter cake, and carrying out vacuum freeze drying on the obtained filter cake to constant weight under the conditions of-30 ℃ and 100Pa of vacuum degree to obtain a dried filter cake;

according to the mass ratio of 3: 1, putting the polypropylene fibers and the dry filter cake into a mixer, stirring and mixing for 4 hours at the rotating speed of 180r/min by a stirrer, opening, carding by a carding machine, spreading the materials on a conveying net belt of a hot air bonding machine, conveying the materials into a drying room of the hot air bonding machine, shaping by hot air at the temperature of 120 ℃, cooling and rolling to obtain the hot air cloth for the diaper.

Example 2

A hot-air cloth for a diaper comprises polypropylene fibers, graphene oxide and polyethylene resin;

the graphene oxide is dispersed to form a monolithic layer structure and is bonded with polypropylene fibers through polyethylene resin;

the mass ratio of the polypropylene fibers to the graphene oxide is 4: 1;

the amount of the polyethylene resin is 8% of the mass of the graphene oxide;

the hot-air cloth for the diaper is prepared by the following steps:

according to the weight parts, 90 parts of polypropylene resin, 8 parts of polyvinylidene fluoride resin and 8 parts of sepiolite are sequentially taken, the polypropylene resin, the polyvinylidene fluoride resin and the sepiolite are mixed and poured into a ball milling tank, and the weight ratio of ball materials is 25: adding zirconia ball milling beads, carrying out ball milling and mixing for 4 hours at the rotating speed of 400r/min, then adding N-methyl pyrrolidone with the mass of 8% of that of polyvinylidene fluoride resin, carrying out ball milling and mixing for 5 hours, discharging, washing for 4 times by using deionized water, carrying out vacuum freeze drying to constant weight under the conditions that the temperature is-40 ℃ and the vacuum degree is 110Pa, obtaining a dry master batch, melting the dry master batch in a screw extruder, then extruding, and carrying out high-temperature melting and spinning to obtain polypropylene fibers; the polypropylene fiber is 40mm long and 3.6dtex denier;

mixing graphene oxide and water according to a mass ratio of 1: 8, mixing, adding sodium polystyrene sulfonate accounting for 2% of the mass of the graphene oxide, performing ultrasonic dispersion for 20min under the condition that the ultrasonic frequency is 60kHz to obtain dispersion liquid, and performing spray drying on the dispersion liquid under the conditions that the air inlet temperature is 145 ℃ and the air outlet temperature is 105 ℃ to obtain pretreated graphene oxide;

mixing the pretreated graphene oxide and polyethylene nanoparticles accounting for 8% of the mass of the pretreated graphene oxide, pouring the mixture into a ball milling tank, and mixing the mixture according to the mass ratio of ball materials of 30: 1, adding zirconia ball grinding beads, and continuously carrying out ball grinding for 60 hours at the temperature of 85 ℃ and the ball grinding rotating speed of 500r/min to obtain a ball grinding material;

preparing a saturated sodium bicarbonate solution at the temperature of 42 ℃, adding ball milling materials with the mass of 0.1 time of that of the saturated sodium bicarbonate solution into the saturated sodium bicarbonate solution under the condition of heat preservation, stirring and mixing, preserving heat and soaking for 40min, cooling to 31 ℃, filtering, collecting a filter cake, and carrying out vacuum freeze drying on the obtained filter cake to constant weight under the conditions of the temperature of-40 ℃ and the vacuum degree of 110Pa to obtain a dried filter cake;

preparation of the product:

according to the mass ratio of 4: 1, putting the polypropylene fibers and the dry filter cake into a mixer, stirring and mixing the mixture for 5 hours at the rotating speed of 190r/min by a stirrer, opening the mixture, carding the mixture by a carding machine, spreading the mixture on a conveying net belt of a hot air bonding machine, conveying the mixture into a drying room of the hot air bonding machine, shaping the mixture by hot air at the temperature of 130 ℃, cooling and rolling the mixture to obtain the hot air cloth for the diaper.

Example 3

A hot-air cloth for a diaper comprises polypropylene fibers, graphene oxide and polyethylene resin;

the graphene oxide is dispersed to form a monolithic layer structure and is bonded with polypropylene fibers through polyethylene resin;

the mass ratio of the polypropylene fibers to the graphene oxide is 5: 1;

the amount of the polyethylene resin is 10% of the mass of the graphene oxide;

the hot-air cloth for the diaper is prepared by the following steps:

taking 100 parts of polypropylene resin, 10 parts of polyvinylidene fluoride resin and 10 parts of sepiolite in sequence according to the parts by weight, firstly mixing the polypropylene resin, the polyvinylidene fluoride resin and the sepiolite, pouring the mixture into a ball milling tank, and mixing the materials according to the ball material mass ratio of 30: adding zirconia ball milling beads, carrying out ball milling and mixing for 6h at the rotating speed of 500r/min, then adding N-methyl pyrrolidone with the mass of 10% of that of polyvinylidene fluoride resin, carrying out ball milling and mixing for 6h, discharging, washing for 5 times by using deionized water, carrying out vacuum freeze drying to constant weight under the conditions that the temperature is-50 ℃ and the vacuum degree is 120Pa, obtaining a dry master batch, melting the dry master batch in a screw extruder, then extruding, and carrying out high-temperature melting and spinning to obtain polypropylene fibers; the polypropylene fiber is 50mm long and 6.6dtex denier;

mixing graphene oxide and water according to a mass ratio of 1: 10, mixing, adding sodium polystyrene sulfonate accounting for 3% of the mass of the graphene oxide, performing ultrasonic dispersion for 30min under the condition that the ultrasonic frequency is 80kHz to obtain dispersion liquid, and performing spray drying on the dispersion liquid under the conditions that the air inlet temperature is 150 ℃ and the air outlet temperature is 110 ℃ to obtain pretreated graphene oxide;

mixing the pretreated graphene oxide and polyethylene nanoparticles accounting for 10% of the mass of the pretreated graphene oxide, pouring the mixture into a ball milling tank, and mixing the mixture according to the mass ratio of 40: 1, adding zirconia ball grinding beads, and continuously carrying out ball grinding for 64 hours at the temperature of 90 ℃ and the ball grinding rotating speed of 600r/min to obtain a ball grinding material;

preparing a saturated sodium bicarbonate solution at the temperature of 45 ℃, adding ball milling materials with the mass of 0.12 time of that of the saturated sodium bicarbonate solution into the saturated sodium bicarbonate solution under the condition of heat preservation, stirring and mixing, preserving heat and soaking for 40min, cooling to 32 ℃, filtering, collecting a filter cake, and carrying out vacuum freeze drying on the obtained filter cake to constant weight under the conditions of-50 ℃ and the vacuum degree of 120Pa to obtain a dried filter cake;

according to the mass ratio of 5: 1, putting the polypropylene fibers and the dry filter cake into a mixer, stirring and mixing for 6 hours at the rotating speed of 200r/min by a stirrer, opening, carding by a carding machine, spreading the materials on a conveying net belt of a hot air bonding machine, conveying the materials into a drying room of the hot air bonding machine, shaping by hot air at the temperature of 150 ℃, cooling and rolling to obtain the hot air cloth for the diaper.

Example 4

This example differs from example 1 in that: the graphene oxide is not pretreated, and the rest conditions are kept unchanged.

Example 5

This example differs from example 1 in that: during the preparation of polypropylene fiber, N-methyl pyrrolidone and sepiolite are not added, and other conditions are kept unchanged.

Comparative example 1

This comparative example differs from example 1 in that: equal-mass polyethylene fibers are adopted to replace graphene oxide, the length of each polyethylene fiber is 30mm, the titer of each polyethylene fiber is 2.6dtex, and the rest conditions are kept unchanged.

Comparative example 2

This comparative example differs from example 1 in that: the saturated sodium bicarbonate solution is replaced by deionized water with equal mass, and the rest conditions are kept unchanged.

The products obtained in examples 1-5 and comparative examples 1-2 were tested for their performance, and the specific test methods and test results were as follows:

testing the filling power: cutting each example product and the comparative example product into square sheets with the size of 10 multiplied by 10cm, stacking the square sheets for 50 layers respectively, testing the height of the square sheets in a natural state, reflecting the fluffiness of the products of different examples and comparative examples according to the height, wherein the higher the height, the fluffier the product is, and the specific test result is shown in table 1;

testing the back-seepage performance: a small-sized glue sprayer is adopted to assemble products obtained in examples 1-5 and comparative examples 1-2 with an absorption layer, a bottom film, a partition edge and a diversion layer respectively to form a paper diaper product (the liquid absorption amount is 100 mL), the paper diaper is adhered on an organic glass plate, the center of the paper diaper is taken as a liquid adding point, the vertical distance between the midpoint of the lower opening of a funnel and the paper diaper is 10mm, 100mL of normal saline is added into a separating funnel by adopting a 100mL standard liquid adding funnel, the valve of the separating funnel is quickly opened to the maximum, the solution freely flows to the surface of the paper diaper, timing is started simultaneously, the same normal saline is injected again after 5min according to the same operation flow, the solution freely flows to the surface of the paper diaper, a plurality of layers of filter paper (the uppermost layer of filter paper does not absorb liquid) with known mass and the diameter of 120cm are quickly placed to the surface of the paper diaper after 10min from the timing is started, and simultaneously 1.2kg of filter, pressurizing for 1min, removing the weight, weighing the mass of the filter paper by balance, and expressing the amount of reverse osmosis by the mass difference before and after the filter paper test, wherein the specific test result is shown in table 1;

table 1: product performance test results

	Height/mm	Return seepage amount/g
			Example 1	105	0.36
Example 2	108	0.35
			Example 3	110	0.33
Example 4	100	0.42
			Example 5	102	0.46
Comparative example 1	65	1.22
			Comparative example 2	62	0.65

The test results in table 1 show that the product obtained by the technical scheme of the invention has excellent bulkiness and can effectively prevent liquid from back-permeating; in addition, as can be seen from the comparison of the data, in example 4, since graphene oxide is not pretreated, the bulk density and the reverse osmosis performance are reduced, and in example 5, the bulk density is improved compared with example 4, but the reverse osmosis performance is reduced because N-methylpyrrolidone and sepiolite are not added; compared with the comparative example 1, the bulkiness and the rewet performance of the product are obviously reduced because graphene oxide is not adopted, and the comparative example 2 lacks the assistance of sodium bicarbonate and also causes insufficient bulkiness, but because the graphene oxide exists, the rewet performance is better than that of the comparative example 1.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (8)

1. The hot-air cloth for the diaper is characterized by comprising polypropylene fibers, graphene oxide and polyethylene resin;

the graphene oxide is dispersed to form a monolithic layer structure and is bonded with polypropylene fibers through polyethylene resin;

the mass ratio of the polypropylene fibers to the graphene oxide is 3: 1-5: 1;

the dosage of the polyethylene resin is 5-10% of the mass of the graphene oxide.

2. The hot air cloth for a diaper according to claim 1, wherein: the length of the polypropylene fiber is 30-50mm, and the titer is 1.1-6.6 dtex.

3. The hot air cloth for a diaper according to claim 1, wherein: the graphene oxide is folded graphene oxide, and the folded graphene oxide is obtained by dispersing graphene oxide and water and then performing spray drying.

4. The hot air cloth for a diaper according to claim 1, wherein: the polypropylene fiber comprises the following raw materials in parts by weight: 80-100 parts of polypropylene resin, 5-10 parts of polyvinylidene fluoride resin and 5-10 parts of sepiolite.

5. The method for preparing the thermal wind cloth for the diaper according to any one of claims 1 to 4, which comprises the following steps:

mixing polyethylene nano-particles accounting for 5-10% of the mass of graphene oxide with graphene oxide, pouring the mixture into a ball milling tank, and continuously performing ball milling for more than 56 hours at the temperature of 80-90 ℃ to obtain a ball grinding material;

soaking the ball-milled material in a saturated sodium bicarbonate solution at the temperature of 40-45 ℃, cooling to 30-32 ℃, filtering, and carrying out vacuum freeze drying to obtain a dry filter cake;

according to the mass ratio of 3: 1-5: 1, uniformly mixing the polypropylene fiber and the dry filter cake, opening, carding, hot air setting at the temperature of 120-150 ℃, cooling, and discharging to obtain the hot air cloth for the diaper.

6. The preparation method of the hot-air cloth for the diaper according to claim 5, wherein the specific preparation steps further comprise pretreating the graphene oxide before ball milling, and the pretreatment steps comprise:

mixing graphene oxide and water according to a mass ratio of 1: 5-1: 10 mixing and dispersing to obtain dispersion, and spray-drying the dispersion.

7. The method for preparing a diaper hot-air cloth according to claim 6, wherein the step of pretreating further comprises: and adding sodium polystyrene sulfonate accounting for 1-3% of the mass of the graphene oxide in the graphene oxide and water dispersion process.

8. The preparation method of the hot-blast cloth for the diaper according to claim 5, wherein the specific preparation steps further comprise the following steps:

according to the weight portion, 80-100 portions of polypropylene resin, 5-10 portions of polyvinylidene fluoride resin and 5-10 portions of sepiolite are taken in sequence, firstly, the polypropylene resin, the polyvinylidene fluoride resin and the sepiolite are mixed for 3-6 hours in a ball milling mode, then N-methyl pyrrolidone with the mass of 5-10% of the polyvinylidene fluoride resin is added, after the ball milling and mixing are continued for 3-6 hours, discharging, washing, drying and melt spinning are carried out.