High-water-absorption fiber for paper diaper and preparation method of high-water-absorption fiber

Abstract

The invention relates to the technical field of fibers, and discloses a high-water-absorption fiber for paper diapers and a preparation method thereof.The high-water-absorption fiber is prepared by taking polyvinyl alcohol as a base material and assisting with modified illite and an aerogel modified material through electrostatic spinning, a natural antibacterial agent pterostilbene is grafted to the surface of the illite, and the high-water-absorption fiber is prepared through electrostatic spinning; on one hand, the compatibility between the illite and the polyvinyl alcohol can be improved through a surface modification mode, and the water absorption effect of the fiber can be enhanced to a certain extent by utilizing the pore structure of the illite, on the other hand, the problem that the illite is easy to oxidize and lose efficacy can be effectively improved after the pterostilbene is grafted on the surface of the illite, and the water absorption effect of the fiber can be enhanced to a certain extent. The aerogel modified material has a special pore structure, so that urine can be quickly absorbed and locked and prevented from back seepage, meanwhile, the pore structure can store the urine, the absorbed water is not easy to flow out, and the excellent water absorption can greatly enhance the water absorption capacity of the polyvinyl alcohol fiber.

Description

Technical Field

[0001] The present invention relates to the technical field of fibers, and particularly to a superabsorbent fiber for diapers and a preparation method thereof. Background Art

[0002] As an essential item for modern care, the performance of diapers has an important impact on comfort and convenience. And superabsorbent fibers are one of the key materials behind the excellent performance of diapers. At present, high-absorbency seaweed fibers, modified polyacrylic acid spun fibers, etc. are mainly used in diapers. Although these fibers themselves have good water absorption effects, however, due to their own defects, the mechanical properties such as tensile strength of these fibers are poor and they are prone to breakage, which leads to limited applications and it is difficult to maintain their continuous application in the diaper field. Polyvinyl alcohol fiber is a natural biodegradable fiber with high tensile strength and flexibility. These characteristics enable polyvinyl alcohol to be widely used in various fields, and its application in diapers mainly benefits from its good water absorption and water retention properties.

[0003] However, polyvinyl alcohol fibers also have defects. For example, the water absorption effect is relatively average, and they do not have antibacterial properties themselves and cannot effectively kill the bacteria growing in the humid environment of diapers. This is actually not friendly to its application in adult diapers. Therefore, it is of great significance to carry out water absorption and antibacterial modification on polyvinyl alcohol fibers. Summary of the Invention

[0004] (I) Technical Problems to be Solved

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

[0006] (II) Technical Solutions

[0007] A preparation method of a superabsorbent fiber for diapers, wherein the modified plastic is made of the following raw materials measured by weight parts: 55 - 68 parts of polyvinyl alcohol, 2 - 4.5 parts of modified illite, 1 - 3 parts of aerogel modifier, and 150 - 200 parts of deionized water;

[0008] The preparation method includes the following steps:

[0009] First step, weigh and prepare each raw material according to the weight parts;

[0010] Second step, add each raw material into a stirring kettle, turn on the heating, control the temperature to 85 - 95°C, and at the same time control the stirring rate to 200 - 500 r / min, stir and mix for 1 - 2 h to form an electrospinning solution;

[0011] Step 3: Inject the electrospinning solution into an electrospinning machine, control the injection speed at 5-15 mm / h, the voltage at 10-20 kV, and the receiving distance at 10-15 cm, perform the electrospinning process, and place the collected fibers in a temperature environment of 100-120 °C for heat treatment for 30-60 min to obtain superabsorbent fibers.

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

[0013] Step S1: Ultrasonically disperse illite in toluene to form a uniform dispersion liquid. After that, add a diisocyanate and a catalyst to the dispersion liquid, then raise the temperature to 70-80 °C, keep stirring for 8-12 h, cool down and discharge, centrifuge to collect the solid material, and then add it to pure water, hydrolyze it at a temperature of 80-100 °C for 4-8 h, separate the solid material again, and after washing and vacuum drying, obtain an illite intermediate;

[0014] Step S2: Add the illite intermediate to an acetic acid aqueous solution with a mass fraction of 2-3%, ultrasonically disperse it evenly, then add paraformaldehyde and pterostilbene, stir to dissolve after adding, then raise the temperature to 70-90 °C, keep stirring for 6-9 h, separate the solid material, and after washing and drying, the modified illite can be obtained.

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

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

[0017] As a further solution of the present invention, in the 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, first, the surface of illite is modified with a diisocyanate to make its surface carry isocyanate groups, then the isocyanate groups are hydrolyzed into amino substituents by hydrolysis, and then pterostilbene is grafted onto the surface of illite through the Mannich reaction.

[0019] As a further solution of the present invention, the preparation method of the aerogel modifier is as follows:

[0020] Step SS1: Mix gellan gum with pure water, stir and mix at 70-80 °C to form a mixed liquid, then add a crosslinking agent to the mixed liquid, then raise the temperature to 90-100 °C, keep stirring for 1-2 h to form a crosslinked gellan gum material;

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

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

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

[0024] A superabsorbent fiber for diapers is prepared by the above preparation method.

[0025] (III) Beneficial technical effects

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

[0027] 2) In the present invention, by preparing the aerogel modified material and using its special pore structure, it can quickly absorb and lock urine, prevent urine backflow, thereby keeping 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 ability can greatly enhance the water absorption capacity of polyvinyl alcohol fibers. Description of the drawings

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a scanning electron microscope image of the aerogel modified material. Detailed implementation manners

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

[0031] Preparation Example 1

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

[0033] Step S1: Ultrasonically disperse 1.5 g of illite in toluene. After forming a uniform dispersion, add 3.5 g of toluene-2,4-diisocyanate and 0.1 g of dibutyltin dilaurate to the dispersion. Then raise the temperature to 75°C, keep stirring for 9 h, cool down and discharge the material. Centrifuge to collect the solid material, and then add it to pure water. Hydrolyze it at 90°C for 6 h, separate the solid material again, wash and vacuum dry it to obtain an illite intermediate.

[0034] Step S2: Add 1.2 g of the illite intermediate to an aqueous acetic acid solution with a mass fraction of 3%. Ultrasonically disperse it evenly, then add 0.4 g of paraformaldehyde and 0.15 g of pterostilbene. After adding, stir to dissolve. Then raise the temperature to 80°C, keep stirring for 8 h, separate the solid material, wash and dry it to obtain the modified illite.

[0035] Preparation Example 2

[0036] The preparation method of the aerogel modifier is as follows:

[0037] Step SS1: Mix 5 g of gellan gum with pure water. After stirring and mixing at 80°C to form a mixed solution, add 0.02 g of sodium trimetaphosphate to the mixed solution. Then raise the temperature to 95°C, keep stirring for 1 h to form a cross-linked gellan gum material.

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

[0039] Figure 1 FIG. is the scanning electron microscope image of the aerogel modifier. 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 highly absorbent fiber for diapers, made from the following raw materials measured 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 method for preparing the highly water-absorbent fiber comprises the following steps:

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

[0044] Step 2: Add all raw materials into a stirring kettle, turn on the heating, control the temperature to 85°C, and control the stirring rate to 200r / min, and stir and mix for 2h 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 carry out 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 highly absorbent fiber for diapers, made from the following raw materials measured 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 method for preparing the highly water-absorbent fiber comprises the following steps:

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

[0051] Step 2: Add all raw materials into a stirring kettle, turn on the heating, control the temperature to 90°C, control the stirring rate to 300r / min, and stir and mix for 2h 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 carry out 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 highly absorbent fiber for diapers, made from the following raw materials measured 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 superabsorbent fiber comprises the following steps:

[0056] Step 1: Weigh and prepare all raw materials according to parts by weight.

[0057] Step 2: Add all raw materials into a stirring kettle, turn on the heating, control the temperature at 95°C, and at the same time control the stirring rate at 500 r / min, stir and mix for 1 h to form an electrospinning solution.

[0058] Step 3: Inject the electrospinning solution into an electrospinning machine, control the injection speed at 15 mm / h, the voltage at 20 kV, and the receiving distance at 15 cm, carry out the electrospinning process, and place the collected fibers in a temperature environment of 100°C for heat treatment for 60 min to obtain the superabsorbent fiber.

[0059] Comparative Example 1

[0060] A superabsorbent fiber for diapers is made from the following raw materials measured by 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 superabsorbent fiber comprises the following steps:

[0062] Step 1: Weigh and prepare all raw materials according to parts by weight.

[0063] Step 2: Add all raw materials into a stirring kettle, turn on the heating, control the temperature at 90°C, and at the same time control the stirring rate at 300 r / min, stir and mix for 2 h to form an electrospinning solution.

[0064] Step 3: Inject the electrospinning solution into an electrospinning machine, control the injection speed at 10 mm / h, the voltage at 15 kV, and the receiving distance at 12 cm, carry out the electrospinning process, and place the collected fibers in a temperature environment of 110°C for heat treatment for 40 min to obtain the superabsorbent fiber.

[0065] Comparative Example 2

[0066] A superabsorbent fiber for diapers is made from the following raw materials measured by parts by weight: 58 parts of polyvinyl alcohol, 2.5 parts of aerogel modifier, and 180 parts of deionized water.

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

[0068] Step 1: Weigh and prepare all raw materials according to parts by weight.

[0069] Step 2: Add each raw material into a stirring kettle, turn on the heating, control the temperature at 90°C, and at the same time control the stirring rate at 300 r / min. Stir and mix for 2 h to form an electrospinning solution.

[0070] Step 3: Inject the electrospinning solution into an electrospinning machine, control the injection speed at 10 mm / h, the voltage at 15 kV, and the receiving distance at 12 cm, and carry out the electrospinning process. Place the collected fibers in a temperature environment of 110°C for heat treatment for 40 min to obtain superabsorbent fibers.

[0071] Test Example

[0072] ① The test method for water absorption capacity is as follows: Cut the fibers in the examples and comparative examples into 10-cm samples, weigh them, and record the weight as X 1 , then immerse the samples in water, take them out after 4 h, and wait until no more water droplets drip from their surfaces. Weigh them again and record the weight as X 2 , calculate the water absorption capacity of the samples, and the calculation formula is (X 2 - X 1 ) / X 1 .

[0073] ② The test method for antibacterial rate is as follows: Make the fibers in the examples and comparative examples into test samples that meet the specifications, and refer to the standard GB / T 20944.3-2008 for antibacterial rate testing;

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

[0075]

[0076]

[0077] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0078] Based on the inspiration of the ideal embodiments of the present invention, through the above description, relevant personnel can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A method for preparing highly absorbent fibers for diapers, characterized in that: The modified plastic is made of the following raw materials measured 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; Step 2: Add all raw materials into a stirring kettle, turn on the heating, control the temperature to 85-95°C, 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 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 carry out the electrospinning process. The collected fibers are placed in a temperature environment of 100-120°C for heat treatment for 30-60min to obtain highly absorbent fibers.

2. The method for preparing a pressure-resistant and high-temperature-resistant PVC modified plastic according to claim 1, characterized in that: 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 the temperature for 8-12 hours, cooling and discharging the material, collecting the solid material by centrifugation, adding the solid material to pure water, hydrolyzing it at 80-100°C for 4-8 hours, separating the solid material again, washing it, and vacuum drying it to obtain an illite intermediate; Step S2, adding the illite intermediate to an acetic acid aqueous solution with a mass fraction of 2-3%, uniformly dispersing by ultrasonication, and then adding paraformaldehyde and pterostilbene, stirring to dissolve, then raising the temperature to 70-90°C, keeping warm and stirring for 6-9 hours, separating the solid material, washing and drying, and obtaining the modified illite.

3. The method for preparing a pressure-resistant and high-temperature-resistant PVC modified plastic according to claim 2, characterized in that: In the step S1, the diisocyanate is any one of toluene diisocyanate, isophorone diisocyanate or hexamethylene diisocyanate.

4. The method for preparing a pressure-resistant and high-temperature-resistant PVC modified plastic according to claim 2, characterized in that: In the step S1, the catalyst is dibutyltin dilaurate or stannous octoate.

5. The method for preparing a pressure-resistant and high-temperature-resistant PVC modified plastic according to claim 2, 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.

6. The method for preparing a pressure-resistant and high-temperature-resistant PVC modified plastic according to claim 1, characterized in that: The preparation method of the modified aerogel material is as follows: Step SS1, mixing gellan gum and pure water, stirring and mixing at 70-80° C. to form a mixed solution, adding a crosslinking agent to the mixed solution, and then raising the temperature to 90-100° C., keeping the mixture warm and stirring for 1-2 hours to form a crosslinked gellan gum material; Step SS2, placing the cross-linked gellan gum in a mold, sealing it, placing it in an environment of 0-5°C for 24-48 hours to form a gel, taking out the gel, and then drying it in an environment of 90-100°C for 12-24 hours, and finally transferring it to a freeze dryer, freeze-drying it at a temperature of -40°C for 24-36 hours, taking it out, and obtaining the aerogel modified material.

7. The method for preparing a pressure-resistant and high-temperature-resistant PVC modified plastic according to claim 6, characterized in that: In the step SS1, the cross-linking agent is any one of sodium trimetaphosphate, sodium hexametaphosphate or sodium tripolyphosphate.

8. A super absorbent fiber for diapers, characterized in that: The method is prepared according to any one of claims 1 to 7.

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