High-strength alginate fiber and preparation method thereof

Abstract

The invention relates to the technical field of fiber materials, and discloses a preparation method of high-strength alginate fibers, which comprises the following steps: step 1, taking fiber-grade sodium alginate as a raw material, and carrying out dissolving, filtering, defoaming and spinning bath to generate nascent alginate fibers; step 2, performing step-by-step high-power stretching on the seaweed nascent fiber through a decrosslinking bath and a crosslinking bath to obtain a primary seaweed fiber product; step 3, performing hot plate preheating and mechanical curling on the alginate fiber primary product to obtain a high-strength alginate fiber semi-finished product; 4, the high-strength semi-finished product is cut off, washed with water, oiled, dried and packaged, and the high-strength alginate fiber is obtained.The alginate fiber prepared through the method has excellent breaking strength and spinnability and meets the post-processing requirement, the dry breaking strength ranges from 2.82 CN / dtex to 5.08 CN / dtex, the wet breaking strength ranges from 2.63 CN / dtex to 4.86 CN / dtex, the fineness ranges from 1.11 dtex to 6.66 dtex, and the CV value of the fineness ranges from 10.0% to 15.0%.

Description

Technical Field

[0001] The invention relates to the technical field of fiber materials, and in particular to a high-strength seaweed fiber and a preparation method thereof. Background Art

[0002] Seaweed fiber has unique gelling properties after contacting with body fluids due to the ion exchange characteristics of the carboxylic acid group. Its exchange properties with metal ions in body fluids play an important role in biological activities such as moisture absorption, moisturizing, antibacterial, healing, hemostasis, detoxification, and whitening. It has high application value in functional medical dressings, functional facial mask materials, maternal and child hygiene products, and adult incontinence products.

[0003] Textile fibers are the interface between various clothing fabrics and the human body, and play a key role in skin and human health. Loading various active ingredients on the fibers and utilizing the hydrophilicity, morphological characteristics, and distribution of crystalline and non-crystalline regions on the fiber surface to promote the controlled release of active ingredients and their interaction with human tissues is an important direction in the research and development and application of bioactive fibers.

[0004] Patent No.: ZL200510131146.0 An alginate / polyvinyl alcohol composite fiber and its preparation method. The composite fiber prepared by the method has good strength, elasticity and biocompatibility, and can be used in the fields of civil textile clothing, medical gauze bandages and other medical textiles, industrial textiles, etc. Patent No.: ZL200510131145.6 A process for preparing seaweed fiber gel spinning, with a draft rate of 40-200%, the initially formed sodium alginate fiber enters the second coagulation bath containing lower alcohol, hydrogen chloride and calcium chloride aqueous solution for ion exchange, and is drafted to obtain a spinnable seaweed fiber product. Patent number: CN201610533173.9 A method for preparing high-strength seaweed fiber, by introducing nano calcium carbonate into sodium alginate solution, using the principle of interface adsorption of nanoparticles and increase of interface free volume, effectively reduces the viscosity of seaweed fiber spinning solution, improves the spinnability of fiber, and has simple process, easy control, high strength and good anti-degradation performance. Patent number: CN108221085A A method for preparing high-strength seaweed fiber, oxidizing the hydroxyl group on sodium alginate monomer into aldehyde group with oxidant to obtain alginate aldehyde; the obtained viscous mixture is extruded into coagulation liquid through spinneret hole to form solid calcium alginate fiber filament, and the obtained product is processed to obtain high-strength ≧2.0CN / dtex seaweed fiber. FZ / T52049-2018 alginate staple fiber quality standard requires a strength of ≥2.0CN / dtex for spinning and ≥1.4CN / dtex for non-woven fabrics; however, in reality, it is difficult to spin pure yarn if the breaking strength is ≥2.0CN / dtex.

[0005] The strength index of high-strength seaweed fiber in the existing technology is measured as greater than 2.0CN / dtex, which is 0.4CN / dtex different from the very poor strength of cotton (code S5) less than 2.4CN / dtex. Usually, it is very difficult to spin the pure or blended civilian clothing textiles and medical dressing textiles during processing, and the low yarn strength during use greatly reduces the wear resistance and abrasion resistance of the fabric; therefore, this limits the excellent performance of seaweed fiber in other textiles. Summary of the invention

[0006] The purpose of the present invention is to effectively bring into play the excellent properties of seaweed fiber and expand its application field, and to provide a high-strength seaweed fiber and a preparation method thereof. The method overcomes the problem of low strength of conventional seaweed fiber and successfully prepares high-strength seaweed fiber. The prepared seaweed fiber can not only meet the requirements of textiles such as medical dressings, but also has a high breaking strength, so that it can be expanded to the fields of civilian clothing, decorative materials, etc., and has good application prospects.

[0007] The invention provides a high-strength seaweed fiber, which is mainly prepared by spinning sodium alginate solution, de-crosslinking bath and crosslinking bath to make the seaweed primary fiber obtain high tensile performance. The high-strength seaweed fiber has a strength of 3.0-4.5 CN / dtex and a fineness of 1.11-6.66 dtex.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A method for preparing high-strength seaweed fiber comprises the following steps:

[0010] Step 1: Using fiber-grade sodium alginate as raw material, dissolving, filtering and degassing to obtain sodium alginate stock solution, and then entering into a spinning bath to generate primary seaweed fibers;

[0011] Step 2: The primary seaweed fiber obtained in step 1 is subjected to step-by-step high-multiple stretching in a de-crosslinking bath and a crosslinking bath to obtain a primary seaweed fiber product;

[0012] Step 3: preheating the primary seaweed fiber product obtained in step 2 through a hot plate, mechanically curling, and obtaining a high-strength seaweed fiber semi-finished product;

[0013] Step 4: The high-strength seaweed fiber semi-finished product obtained in step 3 is cut, washed, oiled, dried, and packaged to harvest the high-strength seaweed fiber.

[0014] By adopting the above technical scheme, the sodium alginate of the present invention can be dissolved, degassed and spun to generate primary seaweed fibers, and the stretching multiple of the primary seaweed fibers can be controlled according to the needs of the present invention. The primary seaweed fibers are decrosslinked, stretched and crosslinked, and the high-strength seaweed fibers are obtained by two-step (segment) high-multiple stretching based on the basis that the decrosslinked polymer structure changes from a mesh to a linear structure. It should be particularly pointed out that the primary seaweed fibers decrosslinked refer to the divalent metal ions in the fibers being partially replaced by the monovalent metal ions of the acid; crosslinking refers to the monovalent hydrogen ions in the fibers being partially replaced by the divalent metal ions of the divalent chloride when they are stretched again.

[0015] The preparation method has simple steps and controllable conditions, and can stably obtain seaweed fibers. The prepared seaweed fibers also have good breaking strength.

[0016] Preferably, in step 1, the concentration of the sodium alginate stock solution is 6-12%.

[0017] Preferably, in step 1, the preparation of primary seaweed fiber includes the following steps: dissolving sodium alginate in desalted water at a temperature of 40 to 80° C. for an effective dissolution time (referring to the temperature reaching a set value) of 1.5 to 3 hours, filtering after the dissolution is completed, and vacuum degassing for 1.5 to 3 hours; the sodium alginate stock solution is driven by pressure, and is sprayed from a spinneret into a spinning bath containing a 1.5 to 5.0% coagulant aqueous solution through a metering pump and pre-spinning filtration to obtain the primary seaweed fiber.

[0018] Preferably, the composition of the spinning bath is: the coagulant content is 1.5-5.0%, and the temperature is controlled at 45-70° C. The spinneret has 10,000-30,000 holes, the hole diameter is 0.06-0.09 mm, and the spinning speed is 5.0-20.0 m / min.

[0019] Preferably, the divalent chloride in the aqueous coagulant solution is one or more of calcium chloride, magnesium chloride, zinc chloride and barium chloride.

[0020] By adopting the above technical solution, when preparing the primary seaweed fiber, the concentration and dissolution time of the sodium alginate stock solution, the components of the spinning bath and the spinning speed will directly affect the quality of the primary seaweed fiber. To this end, the applicant obtained the above reaction parameters through a large number of experiments, and then laid a good front-end link for preparing high-strength seaweed fiber by strictly controlling the reaction parameters.

[0021] Preferably, in step 2, the high-ratio stretching of the seaweed primary fiber is carried out in two steps. The first step of stretching is to stretch in an acidic decrosslinking bath, and then the fiber is transported to a crosslinking bath containing a crosslinking agent via a guide roller for the second step of stretching.

[0022] By adopting the above technical solution, it is known that during the stretching process of the primary seaweed fiber, the two-step stretching multiple without a decrosslinking bath is low, and the two-step stretching in the decrosslinking bath is not re-crosslinked, and the mechanical properties of the fiber in the later stage will decrease, which will eventually not only affect the quality of the fiber, but also affect the use effect to a certain extent. For this reason, the present invention is divided into two steps of stretching. The first step of stretching is mainly to stretch in an acidic decrosslinking bath, so that the divalent metal ions in the primary seaweed fiber are replaced by hydrogen ions, and the polymer chain is transformed from a network structure during molding into a linear structure. The flexibility of the molecular chain is increased, which is conducive to the axial arrangement of the molecules; the second step of stretching is mainly to maximize the stretching multiple, so that the fiber can be in the crosslinking bath, and the seaweed fiber that has been stripped of the crosslinking agent can be recombined with the crosslinking ions under the crosslinking bath environment; in this way, the mechanical properties of the fiber can be maintained.

[0023] Preferably, in step 2, the total stretching ratio of the primary seaweed fiber is 3 to 5 times.

[0024] The present invention performs step-by-step stretching on the primary seaweed fiber, with a total stretching multiple of more than 3 times, that is, the primary seaweed fiber is subjected to a de-crosslinking and re-crosslinking process, so that the fiber macromolecule has a network structure converted into a linear structure, and its plasticization performance is improved, creating a favorable inherent advantage for high-multiple stretching. The corresponding high-strength seaweed fiber not only has the basic properties of seaweed fiber, but also has a certain mechanical strength, and can meet the spinning requirements without blending. The production is environmentally friendly, easy to process, and can be better applied to products such as functional textiles, so that the excellent properties of the seaweed fiber can be effectively exerted.

[0025] The high molecular polymer is extracted from marine organisms (giant algae - N algae, F algae, kelp, etc.), and by adopting the above technical scheme, the degree of arrangement of molecular segments in the high molecular polymer in a specific direction is greatly improved (that is, the degree of orientation is improved), which can reflect that the high molecular chains of the seaweed fiber have a certain degree of orientation along the direction of the fiber axis. In the seaweed fiber of the present invention, due to the de-crosslinking and re-crosslinking process, the stretching multiple of the primary seaweed fiber is greatly improved, ensuring that the high molecular weight is arranged along the axial direction, and the fiber orientation degree is high, and the corresponding fiber has more excellent mechanical properties.

[0026] Preferably, the stretching ratio of the seaweed primary fiber when immersed in an acidic de-crosslinking bath is 1.5 to 3.0; the stretching ratio of the seaweed primary fiber when immersed in a cross-linking bath is 1.2 to 2.5.

[0027] By adopting the above technical solution, step-by-step stretching is implemented in the de-crosslinking bath and the crosslinking bath, and the stretching distribution is very important. Excessive stretching in either the de-crosslinking bath or the crosslinking bath will easily cause the fiber to produce fuzz, making it difficult to ensure the breaking strength of the fiber and not conducive to the next process. Controlling the stretching multiples of 1.5 to 3.0 times in the de-crosslinking bath and 1.2 to 2.5 times in the crosslinking bath can not only stabilize the stretching, but also maximize the stretching multiple. Therefore, the present invention takes it as a further preferred embodiment.

[0028] Preferably, if the acid content in the decrosslinking bath is too high, it is easy for the fibers to be over-decrosslinked and swell, making it difficult to ensure the filamentous structure of the fibers. If the acid content is too low, it is difficult to effectively remove the crosslinking agent on the fibers. The decrosslinking bath obtained by 0.1-2.0% acid and a temperature of 50-70°C can effectively remove the crosslinking agent. If the crosslinking agent content in the crosslinking bath is too high, it is easy for the fibers to be over-crosslinked, resulting in low elongation and brittle breakage of the finished fibers. If the crosslinking agent content is too low, it is difficult to effectively maintain the mechanical properties of the fibers. The crosslinking bath obtained by 1.0-5.0% crosslinking agent and a temperature of 50-70°C can effectively improve the fiber breaking strength.

[0029] Preferably, the acid in the acidic decrosslinking bath is one or more of sulfuric acid, nitric acid, hydrochloric acid, citric acid, acetic acid and tartaric acid, all of which can effectively replace the crosslinking agent on the seaweed fiber;

[0030] The crosslinking agent divalent chloride in the crosslinking bath is one or more of calcium chloride, magnesium chloride, zinc chloride and barium chloride. The divalent chloride can not only crosslink with the seaweed fiber well, but also has the characteristics of being easily soluble and pollution-free, which facilitates subsequent fiber washing, drying and other operations.

[0031] Preferably, in step 3, the primary seaweed fiber product enters a hot plate oven through a tension rack for preheating, and then enters a mechanical crimping machine for curling to ensure that the fiber curling degree meets the textile requirements of 3 to 8 / 25cm; a high-strength seaweed fiber semi-finished product is obtained; the heating temperature of the hot plate is controlled at 100 to 200°C, the curling speed is 15 to 50m / min, and the curling pressure is controlled at 0.25 to 0.5MPa.

[0032] Preferably, in step 4, the high-strength seaweed fiber semi-finished product enters the disc-type high-speed cutting machine through the clustering frame and the fiber kneading machine to be cut into short fibers of a specified length, and then is transported to the fiber feeding hot water tank by a belt conveyor. The short fibers dispersed by the hot water in the fiber feeding tank are flattened and moved to the front-end water washing area of ​​the fiber refining machine under the action of hydraulic power, and are successively washed and pressed multiple times, and then enter the rear-end oiling area for oiling and pressing. The short fibers with relatively stable moisture content are laid into silk sheets of a certain width and thickness by the pressing roller, and driven by the pressing roller, run to wet fiber opening and wet feeding to enter the chain plate dryer for drying, and are packaged with a fixed weight to harvest the high-strength seaweed fiber.

[0033] Preferably, the temperature of water supply and washing is 45-60°C, the concentration of oil bath is 0.1-0.2%, the temperature of oil bath is 45-60°C; the moisture content of fiber after pressing is 55-65%, and the drying temperature is controlled at 100-150°C.

[0034] By adopting the above technical solutions, the high-strength seaweed fiber finished product meets the basic requirements of textile fibers, and the flexibility, antistatic properties, cohesiveness and spinnability of the fiber are further improved.

[0035] A high-strength seaweed fiber is prepared by the above-mentioned method for preparing a high-strength seaweed fiber.

[0036] The beneficial effects of the present invention are:

[0037] 1. The present invention provides a method for preparing high-strength seaweed fiber. The obtained seaweed fiber has excellent breaking strength and spinnability, meeting the post-processing requirements, wherein the dry breaking strength is 2.82-5.08 CN / dtex, the wet breaking strength is 2.63-4.86 CN / dtex, the fineness is 1.11-6.66 dtex, and the fineness variation coefficient CV value is 10.0-15.0%.

[0038] 2. The high-strength seaweed fiber process of the present invention adopts a wet solution two-step spinning process technology, which makes the production more controllable. At the same time, the seaweed fiber after stretching and curling is naturally balanced for 10 to 24 hours, which further eliminates the internal stress of the fiber polymer, makes the polymer structure more stable, significantly improves the fiber size stability, and makes the subsequent treatment more processable.

[0039] 3. When preparing high-strength seaweed fibers, the present invention adopts a "two-step stretching" method to maximize the total stretching multiple of the primary fibers, making the production process more controlled, so that the breaking strength of the obtained high-strength fibers can be effectively improved and maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The present invention is a process flow chart of a method for preparing high-strength seaweed fiber. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0042] Example 1: This example discloses a high-strength seaweed fiber, and its preparation method comprises the following steps:

[0043] S1. Select fiber-grade sodium alginate as raw material, and prepare sodium alginate stock solution with a concentration of 8.0% by weighing a certain weight of sodium alginate and desalted water according to the ratio, the temperature is 60℃, the effective dissolution time is 2.5h, after the dissolution is completed, filter and vacuum degas for 2h; spray out from the spinneret of the metering pump and candle filter in turn, immerse in the spinning bath for coagulation and forming. The spinning bath liquid is 2.5% calcium chloride, and the rest is desalted water, the temperature is 45℃.

[0044] S2, the spun fiber prepared in S1 is pulled to the out-bath guide roller and immersed in the de-interlacing bath, the tow is fully immersed in the bath, and the speed difference between the rear guide roller and the front guide roller is used to implement 2.2 times stretching; then transferred to the cross-linking bath, the tow is fully immersed, and then the speed difference between the out-bath guide roller and the upper bath guide roller is used to implement 1.8 times stretching, and the total stretching multiple is 3.96 times. The de-interlacing bath liquid is 0.15% citric acid, the rest is desalted water, the temperature is 50℃; the cross-linking bath liquid is 2.5% calcium chloride, the rest is desalted water, the temperature is 50℃.

[0045] S3, the primary algae fiber product prepared in S2 is placed in a hot plate oven through a tension rack for preheating, and then placed in a mechanical crimping machine for crimping to obtain a high-strength algae fiber semi-finished product. The hot plate temperature is controlled at 110°C, the speed is 25m / min, and the crimping pressure is 0.35Mpa.

[0046] S4, the high-strength seaweed fiber semi-finished product prepared in S3 is cut into short fibers of specified length by a disc-type high-speed cutting machine through a bundling rack and a fiber kneading machine, and then sent to a fiber hot water tank, and successively completed multiple water washings and multiple pressings, and then enters the rear oiling area for oiling, pressing, and drying; the high-strength seaweed fiber is harvested.

[0047] The fiber was watered and washed at 50°C, the oil bath concentration was 0.1%, the temperature was 50°C, and the drying temperature was 105°C.

[0048] Example 2: This example discloses a high-strength seaweed fiber, and its preparation method comprises the following steps:

[0049] S1. Select fiber-grade sodium alginate as raw material, and prepare a sodium alginate stock solution with a concentration of 10.5% by weighing a certain weight of sodium alginate and desalted water according to the ratio, the temperature is 60℃, the effective dissolution time is 2.5h, after the dissolution is completed, filter and vacuum degas for 2h; spray out from the spinneret of the metering pump and candle filter in turn, immerse in the spinning bath for coagulation and forming. The spinning bath liquid is 2.5% calcium chloride, and the rest is desalted water, the temperature is 55℃.

[0050] S2, the spun fiber prepared in S1 is pulled to the out-bath guide roller and immersed in the de-interlacing bath, the tow is fully immersed in the bath, and the speed difference between the rear guide roller and the front guide roller is used to implement 2.0 times stretching; then transferred to the cross-linking bath, the tow is fully immersed, and then the speed difference between the out-bath guide roller and the upper bath guide roller is used to implement 1.6 times stretching, and the total stretching multiple is 3.20 times. The de-interlacing bath liquid is 0.30% citric acid, the rest is desalted water, the temperature is 60℃; the cross-linking bath liquid is 4.0% calcium chloride, the rest is desalted water, the temperature is 60℃.

[0051] S3, the primary algae fiber product prepared in S2 is placed in a hot plate oven through a tension rack for preheating, and then placed in a mechanical crimping machine for crimping, to obtain a high-strength algae fiber semi-finished product. The hot plate temperature is controlled at 120°C, the speed is 35m / min, and the crimping pressure is 0.40Mpa.

[0052] S4, the high-strength seaweed fiber semi-finished product prepared in S3 is cut into short fibers of specified length by a disc-type high-speed cutting machine through a bundling rack and a fiber kneading machine, and then sent to a fiber hot water tank, and successively completed multiple water washings and multiple pressings, and then enters the rear oiling area for oiling, pressing, and drying; the high-strength seaweed fiber is harvested.

[0053] The fiber was watered and washed at 50°C, the oil bath concentration was 0.1%, the temperature was 50°C, and the drying temperature was 105°C.

[0054] Example 3: This example discloses a high-strength seaweed fiber, and its preparation method comprises the following steps:

[0055] S1. Select fiber-grade sodium alginate as raw material, and prepare a sodium alginate stock solution with a concentration of 10.5% by weighing a certain weight of sodium alginate and desalted water according to the ratio, the temperature is 60℃, the effective dissolution time is 2.5h, after the dissolution is completed, filter and vacuum degas for 2h; spray out from the spinneret of the metering pump and candle filter in turn, immerse in the spinning bath for solidification. The spinning bath liquid is 2.5% magnesium chloride, and the rest is desalted water, the temperature is 55℃.

[0056] S2, the spun fiber prepared in S1 is pulled to the out-bath guide roller and immersed in the de-interlacing bath, the tow is fully immersed in the bath, and the speed difference between the rear guide roller and the front guide roller is used to implement 2.0 times stretching; then transferred to the cross-linking bath, the tow is fully immersed, and then the speed difference between the out-bath guide roller and the upper bath guide roller is used to implement 1.9 times stretching, and the total stretching multiple is 3.8 times. The de-interlacing bath liquid is 0.25% hydrochloric acid, the rest is desalted water, and the temperature is 60°C; the cross-linking bath liquid is 4.0% magnesium chloride, the rest is desalted water, and the temperature is 60°C.

[0057] S3, the primary algae fiber product prepared in S2 is placed in a hot plate oven through a tension rack for preheating, and then placed in a mechanical crimping machine for crimping to obtain a high-strength algae fiber semi-finished product. The hot plate temperature is controlled at 120°C, the speed is 28m / min, and the crimping pressure is 0.35Mpa.

[0058] S4, the high-strength seaweed fiber semi-finished product prepared in S3 is cut into short fibers of specified length by a disc-type high-speed cutting machine through a bundling rack and a fiber kneading machine, and then sent to a fiber hot water tank, and successively completed multiple water washings and multiple pressings, and then enters the rear oiling area for oiling, pressing, and drying; the high-strength seaweed fiber is harvested.

[0059] The fiber was watered and washed at 50°C, the oil bath concentration was 0.1%, the temperature was 50°C, and the drying temperature was 105°C.

[0060] Examples 4-5: Based on the method of Example 1, the sodium alginate concentration and spinning bath parameters in step S1 are adjusted. For specific adjustments, see Table 1 below:

[0061] Table 1 Stock solution concentration and spinning bath parameters of Examples 1, 4 to 5

[0062]

[0063]

[0064] Examples 6 to 10: Based on the method of Example 1, Examples 6 to 10 adjust the two-step (stage) stretching multiple and bath parameters in step S2. For specific adjustments, see Table 2 below:

[0065] Table 2 De-crosslinking bath and crosslinking bath parameters and stretching ratios for Examples 1, 6 to 10

[0066]

[0067] Comparative Example 1:

[0068] Use the currently available seaweed fiber to directly conduct fiber-related mechanical property testing:

[0069] The high-strength seaweed fibers of Examples 1 to 10 above were tested for mechanical properties. The test results are shown in Table 3 below. The test method is as follows:

[0070] Fineness: measured by fineness tester, the testing method is carried out in accordance with GB / T 14355.

[0071] Breaking strength: measured by tensile tester, the testing method is carried out in accordance with GB / T 14337.

[0072] Table 3 Quality of high strength seaweed fibers in comparative example 1 and examples 1 to 10

[0073]

[0074] Combined with Table 3 above, it can be seen that the present invention overcomes the problem that the primary fiber of the conventional seaweed fiber process is difficult to withstand high magnification, and successfully obtains high-strength seaweed fiber. The test shows that the breaking strength of the high-strength seaweed fiber is in the range of 2.96-4.38CN / dtex, the fineness is 1.25-3.33dtex, and the coefficient of variation CV value is 10.0-15.0%. Therefore, it has higher breaking strength than conventional seaweed fiber and has better spinnability than low-strength seaweed fiber.

[0075] Examples 1 to 3 use different sodium alginate stock solution concentrations. From the test results, it can be seen that different sodium alginate stock solution concentrations and different spinning, de-crosslinking, and crosslinking bath solutions can all be used to obtain the corresponding high-strength fibers using the preparation method of the present invention. Combined with the test results of Examples 4 to 5, it can be seen that too high stock solution concentration will have a certain impact on the fiber breaking strength. The present invention further limits the preparation of high-strength seaweed fibers by "limiting the sodium alginate stock solution concentration to 6.0 to 10.5%", thereby ensuring that the obtained seaweed primary fibers have a higher stretch multiple, and thus the obtained finished products have a higher breaking strength.

[0076] Referring to the test results of Example 3, it can be seen that different spinning baths, de-crosslinking baths and cross-linking baths can also produce high-strength seaweed fibers, but the equipment is severely corroded and the production cost will increase.

[0077] Application examples:

[0078] The high-strength fibers produced in Examples 1 to 10 of the present invention can be used in fields including but not limited to: medical dressings, civilian clothing textiles, flame-retardant textiles, functional facial mask materials, maternal and child hygiene products, and adult incontinence products; specifically, they can be made into yarns, non-woven fabrics, flakes, etc. as needed.

[0079] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing high-strength seaweed fiber, characterized in that: The following steps are involved: Step 1: Using fiber-grade sodium alginate as raw material, dissolving, filtering and degassing to obtain sodium alginate stock solution, and then entering into a spinning bath to generate primary seaweed fibers; Step 2: The primary seaweed fiber obtained in step 1 is subjected to step-by-step high-multiple stretching in a de-crosslinking bath and a crosslinking bath to obtain a primary seaweed fiber product; Step 3: preheating the primary seaweed fiber product obtained in step 2 through a hot plate, mechanically curling, and obtaining a high-strength seaweed fiber semi-finished product; Step 4: The high-strength seaweed fiber semi-finished product obtained in step 3 is cut, washed, oiled, dried, and packaged to harvest the high-strength seaweed fiber.

2. The method for preparing high-strength seaweed fiber according to claim 1, characterized in that: In step 1, the concentration of the sodium alginate stock solution is 6-12%.

3. The method for preparing high-strength seaweed fiber according to claim 1, characterized in that: In step 1, the preparation of primary seaweed fiber includes the following steps: dissolving sodium alginate in desalted water at a temperature of 40 to 80° C. for an effective dissolution time of 1.5 to 3 hours, filtering after the dissolution is completed, and vacuum degassing for 1.5 to 3 hours; the sodium alginate stock solution is driven by pressure, and is sprayed from a spinneret into a spinning bath containing a 1.5 to 5.0% coagulant aqueous solution through a metering pump and pre-spinning filtration to obtain the primary seaweed fiber.

4. The high-strength seaweed fiber and the preparation method thereof according to claim 3, characterized in that: The divalent chloride in the aqueous coagulant solution is one or more of calcium chloride, magnesium chloride, zinc chloride and barium chloride.

5. The method for preparing high-strength seaweed fiber according to claim 1, characterized in that: In step 2, the high-multiple stretching of the seaweed primary fiber is carried out in two steps. The first step of stretching is to stretch the primary fiber in an acidic decrosslinking bath and then convey the fiber to a crosslinking bath containing a crosslinking agent via a guide roller for the second step of stretching. The stretching multiple of the seaweed primary fiber when immersed in an acidic de-crosslinking bath is 1.5 to 3.0; the stretching multiple of the seaweed primary fiber when immersed in a cross-linking bath is 1.2 to 2.

5.

6. The method for preparing high-strength seaweed fiber according to claim 5, characterized in that: The acid in the acidic decrosslinking bath is one or more of sulfuric acid, nitric acid, hydrochloric acid, citric acid, acetic acid and tartaric acid; The crosslinking agent divalent chloride in the crosslinking bath is one or more of calcium chloride, magnesium chloride, zinc chloride and barium chloride.

7. The high-strength seaweed fiber and the preparation method thereof according to claim 1, characterized in that: In step 3, the primary seaweed fiber product is heated in a hot plate and mechanically curled, the heating temperature is controlled at 100-200° C., the curling speed is 15-50 m / min, and the curling pressure is controlled at 0.25-0.5 MPa.

8. The high-strength seaweed fiber and the preparation method thereof according to claim 1, characterized in that: In step 4, the high-strength seaweed fiber semi-finished product is cut, washed, oiled, dried and packaged after being balanced for 10 to 24 hours.

9. The high-strength seaweed fiber prepared by the method for preparing high-strength seaweed fiber as claimed in any one of claims 1 to 8.

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