Paper diaper for pilot and preparation method thereof

Abstract

The invention discloses a paper diaper for a pilot and a preparation method of the paper diaper, and belongs to the technical field of paper diaper preparation, the paper diaper comprises a coating surface layer, a flow guide layer, an absorption core layer and a bottom film layer, the absorption core layer is obtained by coating fluff pulp and water absorption particles with non-woven fabrics, acrylic acid and the like are adopted as raw materials, and the water absorption particles are added into the non-woven fabrics; sodium polyacrylate water absorption particles which are prepared by a specific method and have good water absorption, pressure resistance and deodorization are coated in the paper diaper, so that the urine absorption amount of the paper diaper is effectively improved, and meanwhile, urine reverse osmosis under relatively high pressure is inhibited; the problem of urine reverse osmosis caused by overlarge pressure on the paper diaper due to sudden acceleration, high-speed diving and the like of a pilot in the pilot process can be well solved, and the prepared paper diaper has a good application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of diaper preparation, and in particular to a diaper for pilots and a preparation method thereof. Background Art

[0002] Long-duration flights are also called long-distance flights or long-time flights, and generally refer to flights of more than 8 hours. With the advancement of aviation technology, long-duration flights of more than 8 hours are becoming more and more common. It is physiologically necessary for flight personnel to urinate during long-duration flights. Normal adults urinate 4 to 6 times during the day and 0 to 2 times at night. Therefore, flight personnel need to urinate many times during long-duration flights. Solving the urination problem of flight personnel during flight is of great significance to ensuring flight safety.

[0003] Large aircraft such as air passenger planes and large transport aircraft are usually equipped with toilets and toilets, which can solve the problem of urination normally. However, due to the small fuselage and lack of extra space of small aircraft such as fighter jets, flight crews cannot leave their work stations, making it difficult for flight crews of small and medium-sized aircraft to urinate during long-distance flights. At present, conventional methods usually use diapers, urine bags and urinals to solve the urination problem of flight crews of small aircraft. However, when using items such as urine bags and urinals, the pilot's hands and vision need to temporarily leave the flight state, and the flight suit needs to be unbuttoned, which will affect flight safety. In addition, due to the physiological and anatomical characteristics of female pilots, it is difficult to solve the urination problem through urine bags and urinals during flight. Therefore, diapers have become a more commonly used method to solve the urination problem during military flights in China. Although diapers can absorb urine and are simple and easy to use, small aircraft such as fighter jets fly at high speeds and are usually accompanied by sudden acceleration, high-speed dives, and flips during flight, which can exert great pressure on diapers and cause urine to seep back, causing the environment inside the diapers to be damp and airtight, causing discomfort to the human body. In addition, the urine that seeps back will repeatedly come into contact with the skin, causing skin problems such as inflammation.

[0004] Therefore, there is a need to find a diaper suitable for pilots to solve the problem that the current diapers for pilots are prone to reverse osmosis when the pressure changes suddenly or is subjected to greater pressure. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a diaper for pilots and a preparation method thereof. At present, there is a need to find a diaper suitable for pilots to solve the problem that the current diapers for pilots are prone to reverse osmosis when the pressure changes suddenly or is subjected to greater pressure.

[0006] The present invention solves the above technical problems by the following technical means:

[0007] A diaper for pilots, comprising a covering surface layer, a guide layer, an absorbent core layer and a bottom film layer from top to bottom, wherein the absorbent core layer is obtained by coating fluff pulp and water-absorbing particles with non-woven fabric.

[0008] Furthermore, the coating surface layer is a hydrophilic non-woven fabric; the guide layer is any one of a hot air non-woven material or a hot rolled non-woven material; and the bottom film layer is a 0.03 mm PE film.

[0009] Furthermore, the mass ratio of fluff pulp to water-absorbing particles in the absorbent core layer is 1:(1-3).

[0010] Furthermore, the water-absorbing particles include the following raw materials:

[0011] Acrylic acid, 4-aminobenzoic acid, 2-imidazolidinone, mannitol, mesoporous silica, p-hydroxybenzaldehyde, N,N-methylenebisacrylamide, sodium carbonate, ammonium persulfate, sodium sulfite.

[0012] Further, the preparation method of the water-absorbing particles is as follows:

[0013] (1) adding mesoporous silica to water and stirring to disperse, then adding p-hydroxybenzaldehyde and heating to 70-80° C. and stirring to react for 2-3 hours, and after the reaction is completed, washing with water and drying to obtain modified mesoporous silica;

[0014] (2) adding acrylic acid to water and dissolving it to prepare a 35 wt% acrylic acid solution, adding 4-aminobenzoic acid to the acrylic acid solution, heating to 55-65° C. and stirring to react for 60-90 min, then cooling to 40° C. and adding 2-imidazolidinone and stirring to react for 30-60 min. After the reaction is completed, standing for 4-6 h to obtain an acrylic acid mixed solution;

[0015] (3) adjusting the pH of the acrylic acid mixture to 6.5-7, then adding modified mesoporous silica and N,N-methylenebisacrylamide in sequence and stirring and mixing evenly, heating to 40° C., adding sodium carbonate, ammonium persulfate, and sodium sulfite, stirring and reacting for 10-20 minutes, then adding mannitol and mixing evenly, and then standing for 3-5 hours to obtain sodium polyacrylate gel;

[0016] (4) The sodium polyacrylate gel was cut into small pieces of 1×1 cm, dried at 120° C. to a moisture content of ≤8%, and then crushed through a 60-80 mesh sieve to obtain water-absorbing particles.

[0017] Before preparing water-absorbing particles by polymerizing acrylic acid, the present invention first adds 4-aminobenzoic acid for heating reaction. After 4-aminobenzoic acid is combined with acrylic acid, the molecular structure of acrylic acid is changed to adjust the ionization degree of acrylic acid molecules and the electronegativity of atoms in the molecules, thereby increasing the hydrogen bonding ability and the stability of the hydrogen bonds formed between the sodium polyacrylate obtained by polymerization and water molecules, so that the water absorption and water locking properties of the prepared water-absorbing particles are enhanced; subsequently, the temperature is lowered and 2-imidazolidinone is added to continue the reaction. After further combination, the 2-imidazolidinone adjusts the interaction force between molecular chains and inhibits the extension of molecular chain segments, thereby improving the anti-aging property of the polymer gel. compressive strength; then ammonium persulfate and the like are added to initiate the polymerization reaction of acrylic acid, and after the polymerization reaction has been carried out for 10-20 minutes, mannitol is added to graft it onto the lightly polymerized sodium polyacrylate molecular chain, and entangled with the sodium polyacrylate molecular chain to form a more complex network structure, thereby improving the stress dispersion effect of the sodium polyacrylate gel, further improving the compressive strength while ensuring good toughness, so that the sodium polyacrylate gel water-absorbing particles can maintain structural stability under greater pressure, preventing excessive deformation or destruction of the internal network structure when subjected to greater pressure, resulting in the outflow of absorbed urine and inducing urine back seepage.

[0018] Furthermore, in step (1), the mass ratio of mesoporous silica to p-hydroxybenzaldehyde is (0.02-0.03): (0.002-0.003).

[0019] Furthermore, in the step (2), the mass ratio of the acrylic acid solution to 4-aminobenzoic acid and 2-imidazolidinone is (3-5): (0.02-0.03): (0.03-0.06).

[0020] Furthermore, in the step (3), the mass ratio of the acrylic acid mixture to the modified mesoporous silica, N,N-methylenebisacrylamide, sodium carbonate, ammonium persulfate, sodium sulfite, and mannitol is (3-5): (0.015-0.025): (0.001-0.005): (0.001-0.002): (0.002-0.004): (0.003-0.005): (0.01-0.03).

[0021] The present invention also discloses a method for preparing the diaper, and the specific preparation method is as follows:

[0022] The water-absorbing particles and fluff pulp are placed in a forming drum, mixed evenly, and demolded, and then coated with non-woven fabric. After hot-melt adhesive is applied for bonding, they are compacted and cut with double-smooth rollers to obtain an absorbent core layer. The covering surface layer, the guide layer, the absorbent core layer, and the bottom film layer are stacked in sequence from top to bottom, hot-melt adhesive is applied for bonding, and they are compacted and cut with double-smooth rollers to obtain diapers.

[0023] Beneficial effects:

[0024] The present invention uses acrylic acid as a raw material, treats and polymerizes it through a specific method to prepare sodium polyacrylate gel water-absorbing particles. The prepared water-absorbing particles have good water absorption, water locking and good pressure resistance. Even under high pressure, the amount of urine back-seepage is small, which can better solve the urination problem of pilots during flight and has good application prospects. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to specific embodiments:

[0026] The invention discloses a diaper for pilots and a preparation method thereof. Water-absorbing particles are prepared before preparing the diaper, as shown in detail below.

[0027] Example 1: Preparation of water-absorbing particles

[0028] (1) adding 0.025 kg of mesoporous silica to 2.5 kg of water and stirring to disperse, then adding 0.0025 kg of p-hydroxybenzaldehyde and heating to 75° C. and stirring to react for 2.5 hours. After the reaction is completed, filtering to remove the filtrate, washing with clean water twice, and drying at 120° C. to obtain modified mesoporous silica;

[0029] (2) adding acrylic acid to water to dissolve and preparing 4 kg of a 35 wt% acrylic acid solution, adding 0.025 kg of 4-aminobenzoic acid to the acrylic acid solution, heating to 60° C. and stirring for reaction for 80 min, then cooling to 40° C. and adding 0.04 kg of 2-imidazolidinone and stirring for reaction for 40 min. After the reaction is completed, the mixture is allowed to stand for 5 h to obtain an acrylic acid mixture;

[0030] (3) Take 4 kg of acrylic acid mixture, adjust the pH to 6.5, then add 0.02 kg of modified mesoporous silica and 0.003 kg of N,N-methylenebisacrylamide in sequence and stir to mix evenly, heat to 40 ° C, add 0.0015 kg of sodium carbonate, 0.003 kg of ammonium persulfate, and 0.004 kg of sodium sulfite, stir to react for 15 minutes, then add 0.02 kg of mannitol and mix evenly, and then stand for 3 hours to obtain sodium polyacrylate gel;

[0031] (4) The obtained sodium polyacrylate gel was cut into small pieces of 1×1 cm, dried at 120° C. to a moisture content of about 6%, and then crushed through a 60-mesh sieve to obtain water-absorbing particles.

[0032] Example 2: Preparation of water-absorbing particles

[0033] (1) adding 0.02 kg of mesoporous silica to 2 kg of water and stirring to disperse, then adding 0.002 kg of p-hydroxybenzaldehyde and heating to 70° C. and stirring to react for 2 h. After the reaction is completed, filtering and removing the filtrate, washing with clean water twice, and drying at 120° C. to obtain modified mesoporous silica;

[0034] (2) adding acrylic acid to water to dissolve and preparing 3 kg of a 35 wt% acrylic acid solution, adding 0.02 kg of 4-aminobenzoic acid to the acrylic acid solution, heating to 55° C. and stirring for reaction for 60 min, then cooling to 40° C. and adding 0.03 kg of 2-imidazolidinone and stirring for reaction for 30 min. After the reaction is completed, the mixture is allowed to stand for 4 h to obtain an acrylic acid mixture;

[0035] (3) Take 3 kg of acrylic acid mixture, adjust the pH to 6.5, then add 0.015 kg of modified mesoporous silica and 0.001 kg of N,N-methylenebisacrylamide in sequence and stir to mix evenly, heat to 40 ° C, add 0.001 kg of sodium carbonate, 0.002 kg of ammonium persulfate, and 0.003 kg of sodium sulfite, stir to react for 10 minutes, then add 0.01 kg of mannitol and mix evenly, and then stand for 3 hours to obtain sodium polyacrylate gel;

[0036] (4) The obtained sodium polyacrylate gel was cut into small pieces of 1×1 cm, dried at 120° C. to a moisture content of about 6%, and then crushed through a 60-mesh sieve to obtain water-absorbing particles.

[0037] Example 3: Preparation of water-absorbing particles

[0038] (1) adding 0.03 kg of mesoporous silica to 3 kg of water and stirring to disperse, then adding 0.003 kg of p-hydroxybenzaldehyde and heating to 80° C. and stirring to react for 2 h. After the reaction is completed, filtering and removing the filtrate, washing with clean water twice, and drying at 120° C. to obtain modified mesoporous silica;

[0039] (2) adding acrylic acid to water to dissolve and preparing 5 kg of a 35 wt% acrylic acid solution, adding 0.03 kg of 4-aminobenzoic acid to the acrylic acid solution, heating to 65° C. and stirring for reaction for 60 min, then cooling to 40° C. and adding 0.06 kg of 2-imidazolidinone and stirring for reaction for 60 min. After the reaction is completed, the mixture is allowed to stand for 6 h to obtain an acrylic acid mixture;

[0040] (3) Take 5 kg of acrylic acid mixed solution, adjust the pH to 7, then add 0.025 kg of modified mesoporous silica and 0.005 kg of N,N-methylenebisacrylamide in sequence and stir to mix evenly, heat to 40 ° C, add 0.002 kg of sodium carbonate, 0.004 kg of ammonium persulfate, and 0.005 kg of sodium sulfite, stir to react for 20 minutes, then add 0.03 kg of mannitol and mix evenly, and then stand for 5 hours to obtain sodium polyacrylate gel;

[0041] (4) The obtained sodium polyacrylate gel was cut into small pieces of 1×1 cm, dried at 120° C. to a moisture content of about 6%, and then crushed through an 80-mesh sieve to obtain water-absorbing particles.

[0042] Comparative Example 1: Preparation of water-absorbent particles

[0043] In contrast to Example 1, the only difference is that in Comparative Example 1, step (1) is missing when preparing the water-absorbing particles, that is, p-hydroxybenzaldehyde is not used to treat the mesoporous silica, but conventional silica is used.

[0044] Comparative Example 2: Preparation of water-absorbent particles

[0045] In contrast to Example 1, the only difference is that 4-aminobenzoic acid is not added in step (2) when preparing the water-absorbing particles in Comparative Example 2, as shown below:

[0046] (1) Same as Example 1;

[0047] (2) adding acrylic acid to water to dissolve and preparing 4 kg of a 35 wt% acrylic acid solution, heating to 40° C., adding 0.04 kg of 2-imidazolidinone and stirring to react for 40 min, and after the reaction is completed, standing for 5 h to obtain an acrylic acid mixed solution;

[0048] (3)-(4) are the same as in Example 1.

[0049] Comparative Example 3: Preparation of water-absorbent particles

[0050] In contrast to Example 1, the only difference is that 2-imidazolidinone is not added during the preparation of the water-absorbing particles in Comparative Example 3, as shown below:

[0051] (1) Same as Example 1;

[0052] (2) adding acrylic acid to water to dissolve and preparing 4 kg of a 35 wt% acrylic acid solution, adding 0.025 kg of 4-aminobenzoic acid to the acrylic acid solution, heating to 60° C. and stirring to react for 80 min, and after the reaction is completed, standing for 5 h to obtain an acrylic acid mixed solution;

[0053] (3)-(4) are the same as in Example 1.

[0054] Comparative Example 4: Preparation of water-absorbent particles

[0055] In contrast to Example 1, the only difference is that in Comparative Example 4, the water-absorbing particles are prepared without step (2), that is, the sodium polyacrylate gel is directly prepared using acrylic acid solution, as shown below:

[0056] (1) Same as in the embodiment;

[0057] (2) adding acrylic acid to water and dissolving it to prepare 4 kg of a 35 wt% acrylic acid solution; adjusting the pH to 6.5, then adding 0.02 kg of modified mesoporous silica and 0.003 kg of N,N-methylenebisacrylamide in sequence and stirring and mixing evenly, heating to 40° C. and adding 0.0015 kg of sodium carbonate, 0.003 kg of ammonium persulfate, and 0.004 kg of sodium sulfite and stirring and reacting for 15 minutes, then adding 0.02 kg of mannitol and mixing evenly, and then standing for 3 hours to obtain a sodium polyacrylate gel;

[0058] (3) The obtained sodium polyacrylate gel was cut into small pieces of 1×1 cm, dried at 120° C. to a moisture content of about 6%, and then crushed through a 60-mesh sieve to obtain water-absorbing particles.

[0059] Comparative Example 5: Preparation of water-absorbent particles

[0060] In contrast to Example 1, the only difference is that sodium carbonate is not added in step (3) when preparing the water-absorbing particles in Comparative Example 5, as shown below:

[0061] (1)-(2) are the same as in Example 1;

[0062] (3) Take 4 kg of acrylic acid mixture, adjust the pH to 6.5, then add 0.02 kg of modified mesoporous silica and 0.003 kg of N,N-methylenebisacrylamide in sequence and stir to mix evenly, heat to 40 ° C, add 0.003 kg of ammonium persulfate and 0.004 kg of sodium sulfite and stir to react for 15 minutes, then add 0.02 kg of mannitol and mix evenly, and then stand for 3 hours to obtain sodium polyacrylate gel;

[0063] (4) Same as Example 1.

[0064] Comparative Example 6: Preparation of water-absorbent particles

[0065] In contrast to Example 1, the only difference is that mannitol is not added during the preparation of the water-absorbing particles in Comparative Example 6, as shown below:

[0066] (1)-(2) are the same as in Example 1;

[0067] (3) Take 4 kg of acrylic acid mixed solution, adjust the pH to 6.5, then add 0.02 kg of modified mesoporous silica and 0.003 kg of N,N-methylenebisacrylamide in sequence and stir and mix evenly, heat to 40 ° C, add 0.0015 kg of sodium carbonate, 0.003 kg of ammonium persulfate, and 0.004 kg of sodium sulfite and stir and mix evenly, and then let stand for 3 hours to obtain sodium polyacrylate gel;

[0068] (4) Same as Example 1.

[0069] Comparative Example 7: Preparation of water-absorbent particles

[0070] In contrast to Example 1, the only difference is that in the preparation of the water-absorbing particles in Comparative Example 7, no modified mesoporous silica is added in step (3), as shown below:

[0071] (1) Add acrylic acid to water to dissolve and prepare 4 kg of a 35 wt% acrylic acid solution, add 0.025 kg of 4-aminobenzoic acid to the acrylic acid solution, raise the temperature to 60° C. and stir to react for 80 min, then cool to 40° C. and add 0.04 kg of 2-imidazolidinone and stir to react for 40 min. After the reaction is completed, stand for 5 h to obtain an acrylic acid mixed solution;

[0072] (2) taking 4 kg of acrylic acid mixed solution, adjusting the pH to 6.5, then adding 0.003 kg of N,N-methylenebisacrylamide and stirring to mix evenly, heating to 40° C., adding 0.0015 kg of sodium carbonate, 0.003 kg of ammonium persulfate, and 0.004 kg of sodium sulfite, stirring to react for 15 min, then adding 0.02 kg of mannitol and mixing evenly, and then standing for 3 h to obtain sodium polyacrylate gel;

[0073] (3) The obtained sodium polyacrylate gel was cut into small pieces of 1×1 cm, dried at 120° C. to a moisture content of about 6%, and then crushed through a 60-mesh sieve to obtain water-absorbing particles.

[0074] Comparative Example 8: Preparation of water-absorbing particles

[0075] In contrast to Example 1, the only difference is that in Comparative Example 8, the pH is not adjusted in step (3) during the preparation of the water-absorbing particles.

[0076] Comparative Example 9: Preparation of water-absorbent particles

[0077] In contrast to Example 1, the only difference is that mannitol is directly added together with sodium carbonate and ammonium persulfate during the preparation of the water-absorbing particles in Comparative Example 9, as shown below:

[0078] (1)-(2) are the same as in Example 1;

[0079] (3) Take 4 kg of acrylic acid mixed solution, adjust the pH to 6.5, then add 0.02 kg of modified mesoporous silica and 0.003 kg of N,N-methylenebisacrylamide in sequence and stir to mix evenly, heat to 40 ° C, add 0.0015 kg of sodium carbonate, 0.003 kg of ammonium persulfate, 0.004 kg of sodium sulfite, and 0.02 kg of mannitol and mix evenly, and then let stand for 3 hours to obtain sodium polyacrylate gel;

[0080] (4) Same as Example 1.

[0081] Comparative Example 10: Preparation of water-absorbing particles

[0082] In contrast to Example 1, the difference is that the water-absorbing particles in Comparative Example 10 are prepared according to a conventional method, as follows:

[0083] Acrylic acid is added into water to dissolve to prepare 4 kg of 35 wt% acrylic acid solution; 0.003 kg of N,N-methylenebisacrylamide is added and stirred to mix evenly, then the temperature is raised to 40° C., 0.003 kg of ammonium persulfate and 0.004 kg of sodium sulfite are added and mixed evenly, and then the mixture is allowed to stand for 3 hours to obtain sodium polyacrylate gel; the obtained sodium polyacrylate gel is cut into small pieces of 1×1 cm, dried at 120° C. to a moisture content of about 6%, and then crushed through a 60-mesh sieve to obtain water-absorbing particles.

[0084] Example 4: Preparation method of diapers for pilots

[0085] The water-absorbing particles and fluff pulp prepared in Example 1 are placed in a forming drum in a mass ratio of 2:1, mixed evenly, and demolded, then coated with a non-woven fabric, bonded with hot melt adhesive, compacted with double-smooth rollers, and cut to obtain an absorbent core layer; a hydrophilic non-woven fabric is used as a covering surface layer; a hot air non-woven fabric is used as a guide layer; a 0.03 mm thick PE film is used as a base film layer; the covering surface layer, the guide layer, the absorbent core layer, and the base film layer are stacked in sequence from top to bottom, bonded with hot melt adhesive, compacted with double-smooth rollers, and cut to obtain a diaper, wherein the hot melt adhesive temperature is 125°C and the roller pressure is 115°C.

[0086] Experiment 1: Diaper performance test

[0087] 1. For comparison, the water-absorbing particles prepared in Example 1 and Comparative Examples 1-10 were made into diapers according to the method of Example 4, and their respective properties were tested, among which the diapers prepared by the water-absorbing particles prepared by conventional method in Comparative Example 10 were used as blank controls.

[0088] The performance test method is as follows:

[0089] Lay the diaper flat, and then take the center position as the liquid adding point, add 200mL of 0.9% NaCl solution at 0min, 10min, and 35min, and record the completion time of each absorption as the absorption rate (unit: s); at 25min (15min after the second liquid addition) and 50min (15min after the third liquid addition), lay absorbent paper with a diameter of 10cm and a known weight, and then apply a force of 8kg for 5min, and the increased weight of the absorbent paper after absorbing urine is recorded as the re-seepage amount (unit: g).

[0090] The absorption rate and pressurized rewet amount of the diapers prepared from the water-absorbing particles of Example 1 and Comparative Examples 1-10 were measured according to the above method, and the data obtained are shown in Table 1:

[0091] Table 1

[0092]

[0093] According to the data analysis in Table 1:

[0094] (1) The diapers prepared by using the water-absorbing particles of Example 1 can absorb quickly when the liquid amount is 150 mL each time, and the re-seepage amount is also low under a large pressure, which shows that the diapers prepared by the present invention have high water absorption capacity, fast absorption rate, and great pressure resistance. Even under a large pressure, they can effectively lock urine and inhibit the re-seepage of urine, thereby ensuring a good use experience of the diapers and better solving the problem of urine re-seepage in the diapers caused by the large pressure on the diapers during the flight of pilots.

[0095] (2) In Comparative Example 2, 4-aminobenzoic acid was not added during the preparation of the water-absorbing particles. The molecular ionization degree and atomic electronegativity of the prepared water-absorbing particles were low, and thus the hydrogen bonding ability with water molecules was weak, which reduced the water absorption rate. In addition, the stability of the hydrogen bonds was low, and thus the re-seepage amount increased under pressure.

[0096] (3) In comparative example 3, 2-imidazolidinone was not added during the preparation of the water-absorbing particles, and the interaction force between the molecular chains of the prepared water-absorbing particles was poor. After the pressure was applied, the structure between the molecular chains loosened, resulting in the precipitation of water molecules and an increase in the amount of back-seepage. In comparative example 4, conventional acrylic acid was used to prepare the water-absorbing particles, and the water absorption rate of the prepared water-absorbing particles was poor and the amount of back-seepage was high.

[0097] (4) In comparative example 5, no sodium carbonate was added during the preparation of the water-absorbing particles, and the water-absorbing particles had few pore structures, which inhibited the conduction of the liquid and reduced the absorption rate. In comparative example 6, no mannitol was added during the preparation of the water-absorbing particles, and the stress dispersion performance of the water-absorbing particles was poor. After pressure was applied, the gel structure was destroyed, resulting in the outflow of the absorbed liquid and an increase in the amount of back-seepage. In comparative example 9, mannitol was directly added together with the initiator ammonium persulfate during the preparation of the water-absorbing particles. During the polymerization of acrylic acid, mannitol was grafted onto the molecular chain, which affected the interaction force between the molecular chains of sodium polyacrylate after polymerization and affected the strength of the gel. In embodiment 1, mannitol was added after a certain period of polymerization of acrylic acid. Mannitol was grafted onto the molecular chain after polymerization, which not only ensured the strength of the gel, but also increased the pressure bearing points in the gel, which could better disperse the force when subjected to pressure, thereby ensuring the integrity of the structure of the gel when pressurized.

[0098] Experiment 2: Diaper anti-odor performance test experiment

[0099] The water-absorbing particles prepared in Example 1, Comparative Example 1 and Comparative Example 7 were prepared into diapers according to the method of Example 4, and then 100 mL of adult urine was added to the center after being laid flat. After being sealed and placed for 1 hour, 5 testers were randomly selected to evaluate the odor of the diapers after urine was added in each group by sniffing. The data obtained are shown in Table 2.

[0100] Table 2

[0101] Example 1 Comparative Example 1 Comparative Example 7 Odor Assessment Faint taste Strong odor Strong odor

[0102] According to Table 2, the diapers prepared by the present invention emit only a weak smell after absorbing urine, while Comparative Example 1 and Comparative Example 7 have a strong odor and a strong odor respectively. In Comparative Example 1, p-hydroxybenzaldehyde is not used to treat the mesoporous silica, and thus only a weak physical adsorption performance is obtained, and a strong odor is emitted after urine absorption. In Example 1, p-hydroxybenzaldehyde is added to treat the mesoporous silica, which increases the odor adsorption sites in the mesoporous silica. When urine passes through the surface coating layer and the guide layer and diffuses into the water-absorbing core layer through the silica pore structure, the active adsorption sites in the silica are combined with the odorous substances in the urine to eliminate a large amount of odor; while in Comparative Example 7, when no mesoporous silica is added, the odor emitted by hydrogen sulfide in the urine is strong. In addition, the present invention adds modified silica to the water-absorbing particles to eliminate the odor, rather than adding a deodorizing component to the coating layer that is in direct contact with the skin, which can better ensure the safety of the diapers.

[0103] Experiment 3: Diaper urine saturation absorption test

[0104] Experiments 1 and 2 verified that the diapers prepared by the method of the present invention have good urine absorption speed, anti-reperfusion and anti-odor properties, so further experiments were conducted to detect the urine saturation absorption capacity of the diapers prepared by the present invention. The specific method is as follows:

[0105] 20L of 0.9% NaCl solution (simulated urine) was prepared and loaded into a container, and then the water-absorbing particles were prepared according to the method of Example 1, and then an absorbent core layer with a length of 35 cm, a width of 12 cm, and a thickness of 15 mm was prepared according to the method of Example 4. The absorbent core layer was immersed in the simulated urine, and after soaking for 30 minutes, it was taken out and drained, and then the weight gain of the absorbent core layer after soaking was taken as the saturated absorption amount, and the weight gain (saturated absorption amount) was measured to be 1883.6g. According to the calculation that the urine volume of an adult is 300-400mL at a time, the diaper prepared by the present invention can achieve urination absorption for more than 3-4 times, which can better solve the urination problem of pilots during long-duration flights, and has good application prospects.

[0106] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The techniques, shapes, and structural parts not described in detail in the present invention are all known technologies.

Claims

1. A diaper for pilots, characterized in that: The diaper comprises a covering surface layer, a guide layer, an absorbent core layer and a bottom film layer from top to bottom, and the absorbent core layer is obtained by coating fluff pulp and water-absorbing particles with non-woven fabric.

2. A diaper for pilots according to claim 1, characterized in that: The coating surface layer is a hydrophilic non-woven fabric; the flow-guiding layer is any one of a hot air non-woven material or a hot-rolled non-woven material; and the bottom film layer is a PE film.

3. A diaper for pilots according to claim 2, characterized in that: The mass ratio of fluff pulp to water-absorbing particles in the absorbent core layer is 1:(1-3).

4. A diaper for pilots according to claim 3, characterized in that: The water-absorbing particles include the following raw materials: Acrylic acid, 4-aminobenzoic acid, 2-imidazolidinone, mannitol, mesoporous silica, p-hydroxybenzaldehyde, N,N-methylenebisacrylamide, sodium carbonate, ammonium persulfate, sodium sulfite.

5. A diaper for pilots according to claim 4, characterized in that: The preparation method of the water-absorbing particles is as follows: (1) adding mesoporous silica to water and stirring to disperse, then adding p-hydroxybenzaldehyde and heating to 70-80° C. and stirring to react for 2-3 hours, and after the reaction is completed, washing with water and drying to obtain modified mesoporous silica; (2) adding acrylic acid to water and dissolving it to prepare a 35 wt% acrylic acid solution, adding 4-aminobenzoic acid to the acrylic acid solution, heating to 55-65° C. and stirring to react for 60-90 min, then cooling to 40° C. and adding 2-imidazolidinone and stirring to react for 30-60 min. After the reaction is completed, standing for 4-6 h to obtain an acrylic acid mixed solution; (3) adjusting the pH of the acrylic acid mixture to 6.5-7, then adding modified mesoporous silica and N,N-methylenebisacrylamide in sequence and stirring and mixing evenly, heating to 40° C., adding sodium carbonate, ammonium persulfate, and sodium sulfite, stirring and reacting for 10-20 minutes, then adding mannitol and mixing evenly, and then standing for 3-5 hours to obtain sodium polyacrylate gel; (4) Cut the sodium polyacrylate gel into blocks, dry them at 120° C. until the moisture content is ≤ 8%, and then grind them through a 60-80 mesh sieve to obtain water-absorbing particles.

6. A diaper for pilots according to claim 5, characterized in that: The mass ratio of mesoporous silica to p-hydroxybenzaldehyde in step (1) is (0.02-0.03): (0.002-0.003).

7. A diaper for pilots according to claim 6, characterized in that: In the step (2), the mass ratio of the acrylic acid solution to 4-aminobenzoic acid and 2-imidazolidinone is (3-5): (0.02-0.03): (0.03-0.06).

8. The pilot diaper according to claim 7, characterized in that: In the step (3), the mass ratio of the acrylic acid mixture to the modified mesoporous silica, N,N-methylenebisacrylamide, sodium carbonate, ammonium persulfate, sodium sulfite and mannitol is (3-5): (0.015-0.025): (0.001-0.005): (0.001-0.002): (0.002-0.004): (0.003-0.005): (0.01-0.03).

9. A method for preparing diapers for pilots, characterized in that: The preparation method is as follows: The water-absorbing particles and fluff pulp are placed in a forming drum, mixed evenly, and demolded, and then coated with non-woven fabric. After hot-melt adhesive is applied for bonding, they are compacted and cut with double-smooth rollers to obtain an absorbent core layer. The covering surface layer, the guide layer, the absorbent core layer, and the bottom film layer are stacked in sequence from top to bottom, hot-melt adhesive is applied for bonding, and they are compacted and cut with double-smooth rollers to obtain diapers.

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