High water-absorbing fiber for paper diaper and method for preparing the same

Abstract

The application relates to the technical field of fibers, and discloses a high water-absorbing fiber for paper diapers and a preparation method thereof. The high water-absorbing fiber is prepared by electrospinning with polyvinyl alcohol as a base material, supplemented with modified illite and aerogel modified material. The natural antibacterial agent tropolone is grafted on the surface of the illite, on one hand, the compatibility between the illite and the polyvinyl alcohol can be improved through surface modification, the pore structure of the illite can be utilized to enhance the water-absorbing effect of the fiber to a certain extent, on the other hand, the grafting of the tropolone on the surface of the illite can effectively improve the problem of easy oxidation failure, thereby guaranteeing the long-acting antibacterial performance of the fiber. The aerogel modified material has a special pore structure, which can rapidly absorb and lock urine, prevent urine backflow, meanwhile, the pore structure can store urine, and the absorbed water is not easy to flow out. The excellent water-absorbing property can greatly enhance the water-absorbing capacity of the polyvinyl alcohol fiber.

Description

Technical Field

[0001] The present invention relates to the field of fiber technology, and in particular to a high water-absorbent fiber for diapers and a preparation method thereof. Background Art

[0002] Diapers are essential for modern nursing care, and their performance has a significant impact on comfort and convenience. Highly absorbent fibers are one of the key materials behind the high-quality performance of diapers. At present, diapers mainly use highly absorbent seaweed fibers, modified polyacrylic acid spun fibers, etc. Although these fibers themselves have good water absorption effects, they are subject to their own defects. The mechanical properties such as tensile strength of these fibers are poor and they are prone to breakage, which limits their application and makes it difficult to maintain their continued application in the diaper field. Polyvinyl alcohol fiber is a natural, degradable fiber with high tensile strength and flexibility. These properties make polyvinyl alcohol widely used in various fields, and its application in diapers is mainly due to its good water absorption and water retention.

[0003] However, polyvinyl alcohol fibers also have defects. For example, their water absorption effect is relatively general, and they do not have antibacterial properties. They cannot effectively kill bacteria that grow in the humid environment of diapers. This is actually not friendly to their application in adult diapers. Therefore, it is of great significance to modify the water absorption and antibacterial properties of polyvinyl alcohol fibers. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the deficiencies in the prior art, the present invention provides a super absorbent fiber for diapers and a preparation method thereof.

[0006] (2) Technical solution

[0007] A method for preparing a super absorbent fiber for diapers, wherein the modified plastic is prepared from the following raw materials measured in parts by weight: 55-68 parts of polyvinyl alcohol, 2-4.5 parts of modified illite, 1-3 parts of aerogel modified material, and 150-200 parts of deionized water;

[0008] The preparation method comprises the following steps:

[0009] The first step is to weigh and prepare all the raw materials according to their weight;

[0010] The second step is to add all the raw materials into a stirring kettle, turn on the heating, control the temperature to 85-95°C, and control the stirring rate to 200-500r / min, and stir and mix for 1-2h to form an electrospinning solution;

[0011] The third step is to inject the electrospinning liquid into the electrospinning machine, control the injection speed to 5-15mm / h, the voltage to 10-20kV, the receiving distance to 10-15cm, and perform the electrospinning process. The collected fibers are placed in a temperature environment of 100-120℃ for heat treatment for 30-60min to obtain highly absorbent fibers.

[0012] As a further embodiment of the present invention, the preparation method of the modified illite is as follows:

[0013] Step S1, ultrasonically dispersing illite in toluene to form a uniform dispersion, adding a diisocyanate and a catalyst to the dispersion, then raising the temperature to 70-80°C, stirring at this temperature for 8-12 hours, cooling the material, collecting the solid material by centrifugation, adding the solid material to pure water, and hydrolyzing it at 80-100°C for 4-8 hours. The solid material is separated again, washed, and vacuum dried to obtain an illite intermediate;

[0014] Step S2: adding the illite intermediate to an acetic acid aqueous solution with a mass fraction of 2-3%, ultrasonically dispersing the mixture uniformly, then adding paraformaldehyde and pterostilbene, stirring to dissolve, then raising the temperature to 70-90°C, keeping the mixture warm and stirring for 6-9 hours, separating the solid material, washing, and drying the solid material to obtain the modified illite.

[0015] As a further embodiment of the present invention, in step S1, the diisocyanate is any one of toluene diisocyanate, isophorone diisocyanate or hexamethylene diisocyanate.

[0016] As a further embodiment of the present invention, in step S1, the catalyst is dibutyltin dilaurate or stannous octoate.

[0017] As a further embodiment of the present invention, in step S2, the mass ratio of the illite intermediate, paraformaldehyde and pterostilbene is 1:0.3-0.4:0.1-0.2.

[0018] In the above technical solution, the illite is first surface-modified with diisocyanate so that its surface carries isocyanate groups. The isocyanate groups are then hydrolyzed into amino substituents by hydrolysis, and then rosewood is grafted onto the illite surface through the Mannich reaction.

[0019] As a further embodiment of the present invention, the preparation method of the modified aerogel material is as follows:

[0020] Step SS1: Gellan gum and pure water are mixed and stirred at 70-80° C. to form a mixed solution. A crosslinking agent is added to the mixed solution, and then the temperature is increased to 90-100° C. and stirred for 1-2 hours to form a crosslinked gellan gum material.

[0021] Step SS2: Place the cross-linked gellan gum in a mold, seal it, and place it in an environment of 0-5°C for 24-48 hours to form a gel. Take out the gel, dry it in an environment of 90-100°C for 12-24 hours, and finally transfer it to a freeze dryer and freeze-dry it at a temperature of -40°C for 24-36 hours. Take it out to obtain the aerogel modified material.

[0022] As a further embodiment of the present invention, in step SS1, the cross-linking agent is any one of sodium trimetaphosphate, sodium hexametaphosphate or sodium tripolyphosphate.

[0023] In the above technical solution, gellan gum is cross-linked and modified by using a cross-linking agent to prepare a cross-linked gellan gum material, which is then freeze-dried to form an aerogel to obtain an aerogel modified material.

[0024] A super absorbent fiber for diapers is prepared by adopting the above preparation method.

[0025] (3) Beneficial technical effects

[0026] 1) The present invention grafts the natural antibacterial agent pterostilbene onto the surface of illite through the Mannich reaction. On the one hand, the compatibility between illite and polyvinyl alcohol can be improved by surface modification. The pore structure of illite itself can be used to enhance the water absorption effect of the fiber to a certain extent. On the other hand, after the pterostilbene is grafted onto the surface of illite, the problem of its easy oxidation failure can be effectively improved, thereby ensuring the long-term antibacterial performance of the fiber.

[0027] 2) The present invention prepares aerogel modified materials and utilizes their special pore structure, which can quickly absorb and lock urine, prevent urine backseepage, and thus keep the skin dry. At the same time, the pore structure can store urine, and the absorbed water is not easy to flow out. This excellent water absorption can greatly enhance the water absorption capacity of polyvinyl alcohol fiber. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 1 This is a scanning electron microscope image of the aerogel modified material. DETAILED DESCRIPTION

[0030] To facilitate understanding of the present invention, the present invention will be described in more detail below. Preferred embodiments of the present invention are provided below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0031] Preparation Example 1

[0032] The preparation method of modified illite is as follows:

[0033] Step S1, ultrasonically dispersing 1.5 g of illite in toluene to form a uniform dispersion, adding 3.5 g of toluene-2,4-diisocyanate and 0.1 g of dibutyltin dilaurate to the dispersion, then raising the temperature to 75° C., stirring at this temperature for 9 hours, cooling the material, collecting the solid material by centrifugation, and then adding the solid material to pure water, hydrolyzing it at 90° C. for 6 hours, separating the solid material again, washing it, and vacuum drying it to obtain an illite intermediate;

[0034] Step S2: 1.2 g of the illite intermediate is added to a 3% mass fraction of acetic acid aqueous solution and ultrasonically dispersed uniformly. Then, 0.4 g of paraformaldehyde and 0.15 g of pterostilbene are added and stirred to dissolve. The temperature is then raised to 80° C. and stirred for 8 hours. The solid material is separated and washed and dried to obtain the modified illite.

[0035] Preparation Example 2

[0036] The preparation method of aerogel modified material is as follows:

[0037] Step SS1: 5 g of gellan gum was mixed with pure water, and the mixture was stirred at 80° C. to form a mixed solution. 0.02 g of sodium trimetaphosphate was added to the mixed solution, and the temperature was raised to 95° C. and stirred for 1 hour to form a cross-linked gellan gum material.

[0038] Step SS2: Place the cross-linked gellan gum in a mold, seal it, and place it in a 4°C environment for 48 hours to form a gel. Take out the gel, dry it in a 95°C temperature environment for 24 hours, and finally transfer it to a freeze dryer and freeze-dry it at -40°C for 24 hours. Take it out to obtain the aerogel modified material.

[0039] Figure 1 This is a scanning electron microscope image of the aerogel modified material. It can be clearly seen that it has a rich and uniform pore structure and can absorb and store water.

[0040] Example 1

[0041] A super absorbent fiber for diapers, made from the following raw materials measured in parts by weight: 55 parts of polyvinyl alcohol, 2 parts of modified illite, 1 part of aerogel modified material, and 150 parts of deionized water;

[0042] The preparation method of the super absorbent fiber comprises the following steps:

[0043] The first step is to weigh and prepare all the raw materials according to their weight;

[0044] The second step is to add all the raw materials into the stirring tank, turn on the heating, control the temperature to 85 ° C, and control the stirring rate to 200 r / min, and stir and mix for 2 hours to form an electrospinning solution;

[0045] The third step is to inject the electrospinning liquid into the electrospinning machine, control the injection speed to 5 mm / h, the voltage to 10 kV, the receiving distance to 10 cm, and perform the electrospinning process. The collected fibers are placed in a temperature environment of 120°C for heat treatment for 30 minutes to obtain highly absorbent fibers.

[0046] The preparation method of the modified illite is shown in Preparation Example 1; the preparation method of the modified aerogel is shown in Preparation Example 2, and the same applies to the following.

[0047] Example 2

[0048] A super absorbent fiber for diapers, made from the following raw materials measured in parts by weight: 58 parts of polyvinyl alcohol, 4 parts of modified illite, 2.5 parts of aerogel modified material, and 180 parts of deionized water;

[0049] The preparation method of the super absorbent fiber comprises the following steps:

[0050] The first step is to weigh and prepare all the raw materials according to their weight;

[0051] The second step is to add all the raw materials into the stirring tank, turn on the heating, control the temperature to 90 ° C, and control the stirring rate to 300 r / min, and stir and mix for 2 hours to form an electrospinning solution;

[0052] The third step is to inject the electrospinning liquid into the electrospinning machine, control the injection speed to 10 mm / h, the voltage to 15 kV, the receiving distance to 12 cm, and perform the electrospinning process. The collected fibers are placed in a temperature environment of 110°C for heat treatment for 40 minutes to obtain highly absorbent fibers.

[0053] Example 3

[0054] A super absorbent fiber for diapers, made from the following raw materials measured in parts by weight: 68 parts of polyvinyl alcohol, 4.5 parts of modified illite, 3 parts of aerogel modified material, and 200 parts of deionized water;

[0055] The preparation method of the super absorbent fiber comprises the following steps:

[0056] The first step is to weigh and prepare all the raw materials according to their weight;

[0057] The second step is to add all the raw materials into the stirring tank, turn on the heating, control the temperature to 95 ° C, and control the stirring rate to 500 r / min, and stir and mix for 1 hour to form an electrospinning solution;

[0058] The third step is to inject the electrospinning liquid into the electrospinning machine, control the injection speed to 15 mm / h, the voltage to 20 kV, the receiving distance to 15 cm, and perform the electrospinning process. The collected fibers are placed in a temperature environment of 100 ° C for heat treatment for 60 minutes to obtain highly absorbent fibers.

[0059] Comparative Example 1

[0060] A super absorbent fiber for diapers, made from the following raw materials measured in parts by weight: 58 parts of polyvinyl alcohol, 4 parts of modified illite, and 180 parts of deionized water;

[0061] The preparation method of the super absorbent fiber comprises the following steps:

[0062] The first step is to weigh and prepare all the raw materials according to their weight;

[0063] The second step is to add all the raw materials into the stirring tank, turn on the heating, control the temperature to 90 ° C, and control the stirring rate to 300 r / min, and stir and mix for 2 hours to form an electrospinning solution;

[0064] The third step is to inject the electrospinning liquid into the electrospinning machine, control the injection speed to 10 mm / h, the voltage to 15 kV, the receiving distance to 12 cm, and perform the electrospinning process. The collected fibers are placed in a temperature environment of 110°C for heat treatment for 40 minutes to obtain highly absorbent fibers.

[0065] Comparative Example 2

[0066] A super absorbent fiber for diapers, made from the following raw materials measured in parts by weight: 58 parts of polyvinyl alcohol, 2.5 parts of aerogel modified material, and 180 parts of deionized water;

[0067] The preparation method of the super absorbent fiber comprises the following steps:

[0068] The first step is to weigh and prepare all the raw materials according to their weight;

[0069] The second step is to add all the raw materials into the stirring tank, turn on the heating, control the temperature to 90 ° C, and control the stirring rate to 300 r / min, and stir and mix for 2 hours to form an electrospinning solution;

[0070] The third step is to inject the electrospinning liquid into the electrospinning machine, control the injection speed to 10 mm / h, the voltage to 15 kV, the receiving distance to 12 cm, and perform the electrospinning process. The collected fibers are placed in a temperature environment of 110°C for heat treatment for 40 minutes to obtain highly absorbent fibers.

[0071] Test Case

[0072] ①. The test method for water absorption rate is as follows: cut the fibers in the examples and comparative examples into 10 cm samples, weigh them, and record the weight as X1. Then, immerse the samples in water, take them out after 4 hours, wait until no water drops flow out from the surface, weigh them again, and record the weight as X2. Calculate the water absorption rate of the samples using the formula (X2-X1) / X1.

[0073] ② The antibacterial rate test method is as follows: the fibers in the examples and comparative examples are made into test samples that meet the specifications, and the antibacterial rate test is performed with reference to the standard GB / T 20944.3-2008;

[0074] The results are shown in the table below:

[0075]

[0076]

[0077] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0078] Based on the ideal embodiments of the present invention, and with reference to the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A method for preparing super absorbent fiber for diapers, characterized in that: The super absorbent fiber is made of the following raw materials measured in parts by weight: 55-68 parts of polyvinyl alcohol, 2-4.5 parts of modified illite, 1-3 parts of aerogel modified material, and 150-200 parts of deionized water; The preparation method comprises the following steps: The first step is to weigh and prepare all the raw materials according to their weight; The second step is to add all the raw materials into a stirring kettle, turn on the heating, control the temperature to 85-95°C, and control the stirring rate to 200-500r / min, and stir and mix for 1-2h to form an electrospinning solution; The third step is to inject the electrospinning solution into the electrospinning machine, control the injection speed to 5-15 mm / h, the voltage to 10-20 kV, and the receiving distance to 10-15 cm, and perform the electrospinning process. The collected fibers are placed in a temperature environment of 100-120 ° C for 30-60 minutes to obtain highly absorbent fibers. The preparation method of the modified illite is as follows: Step S1, ultrasonically dispersing illite in toluene to form a uniform dispersion, adding a diisocyanate and a catalyst to the dispersion, then raising the temperature to 70-80°C, stirring at this temperature for 8-12 hours, cooling the material, collecting the solid material by centrifugation, adding the solid material to pure water, and hydrolyzing it at 80-100°C for 4-8 hours. The solid material is separated again, washed, and vacuum dried to obtain an illite intermediate; Step S2: adding the illite intermediate to an acetic acid aqueous solution with a mass fraction of 2-3%, ultrasonically dispersing the mixture uniformly, then adding paraformaldehyde and pterostilbene, stirring to dissolve, then raising the temperature to 70-90°C, keeping the mixture warm and stirring for 6-9 hours, separating the solid material, washing, and drying the solid material to obtain the modified illite.

2. The method for preparing a super absorbent fiber for diapers according to claim 1, characterized in that: In the step S1, the diisocyanate is any one of toluene diisocyanate, isophorone diisocyanate or hexamethylene diisocyanate.

3. The method for preparing a super absorbent fiber for diapers according to claim 1, characterized in that: In step S1, the catalyst is dibutyltin dilaurate or stannous octoate.

4. The method for preparing a super absorbent fiber for diapers according to claim 1, characterized in that: In the step S2, the mass ratio of the illite intermediate, paraformaldehyde and pterostilbene is 1:0.3-0.4:0.1-0.

2.

5. The method for preparing a super absorbent fiber for diapers according to claim 1, characterized in that: The preparation method of the modified aerogel material is as follows: Step SS1: Gellan gum and pure water are mixed and stirred at 70-80° C. to form a mixed solution. A crosslinking agent is added to the mixed solution, and then the temperature is increased to 90-100° C. and stirred for 1-2 hours to form a crosslinked gellan gum material. Step SS2: Place the cross-linked gellan gum in a mold, seal it, and place it in an environment of 0-5°C for 24-48 hours to form a gel. Take out the gel, dry it in an environment of 90-100°C for 12-24 hours, and finally transfer it to a freeze dryer and freeze-dry it at a temperature of -40°C for 24-36 hours. Take it out to obtain the aerogel modified material.

6. The method for preparing a super absorbent fiber for diapers according to claim 5, characterized in that: In the step SS1, the cross-linking agent is any one of sodium trimetaphosphate, sodium hexametaphosphate or sodium tripolyphosphate.

7. A super absorbent fiber for diapers, characterized in that: The method is as described in any one of claims 1 to 6.

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