Multifunctional blended yarn for emergency rescue and preparation method thereof

Abstract

The invention relates to a multifunctional blended yarn for emergency rescue and a preparation method thereof, regenerated cellulose fibers are subjected to surface treatment, and then porous calcium carbonate is deposited on the surfaces of the regenerated cellulose fibers through an in-situ synthesis method; the treated modified regenerated cellulose fibers and chitosan fibers are blended, and the multifunctional blended yarn is obtained. The yarn integrates multiple functions of antibiosis, flame retardance and hemostasis through innovative material combination. The regenerated cellulose fibers and the chitosan fibers are blended, porous calcium carbonate is compounded to the surfaces of the cellulose fibers by using an in-situ synthesis method, and an environment-friendly flame-retardant after-finishing agent is adopted for treatment, so that the flame-retardant performance of the yarn is enhanced, and the softness and the air permeability of the yarn are kept. Compared with the prior art, the yarn has better environmental friendliness, lasting functionality and higher comfort, and an efficient, environment-friendly and safe novel yarn solution is provided for the field of emergency rescue.

Description

Technical Field

[0001] This patent relates to the technical field of blended yarn preparation, and in particular to a multifunctional blended yarn for emergency rescue and its preparation method. Background Art

[0002] In the field of emergency rescue, the demand for multifunctional textiles with antibacterial, flame retardant, hemostatic and other functions is growing. These textiles can provide additional protection for rescuers in complex and changeable rescue environments and reduce the risk of injury when they are performing their tasks. For example, emergency rescuers often face fire and high temperature environments, so they have high requirements for the flame retardant properties of textiles. Flame retardant textiles can reduce the speed of heat transfer and protect the human body from heat sources. At the same time, during the rescue process, rescuers may be exposed to various harmful microorganisms, increasing the risk of infection. Antibacterial textiles are particularly important in emergency rescue. Antibacterial textiles can kill or inhibit the growth of microorganisms and protect rescuers from bacterial infection. In addition, emergency rescue is often accompanied by trauma and bleeding. Textiles with hemostatic functions can quickly control bleeding and reduce the risk of life of the wounded. Therefore, the demand for antibacterial, flame retardant, and hemostatic multifunctional textiles in emergency rescue is multifaceted. These functions can not only protect the safety of rescuers, but also improve the efficiency and success rate of rescue.

[0003] The multifunctional yarns in the prior art often have certain limitations. On the one hand, many yarns only have a single or two functions, which makes it difficult to meet the comprehensive needs of rescuers for protective equipment in complex environments. For example, although some yarns have good antibacterial properties, they are insufficient in flame retardancy and hemostasis. On the other hand, the methods used in the prior art to enhance the functionality of yarns often involve complex post-processing processes or complex yarn structures, which not only increase production costs, but may also affect the basic physical properties of the yarns. For example, patent CN 217532167 proposes a cotton yarn with flame retardant, antibacterial and hemostatic functions, which is achieved through its unique structural design: the cotton yarn body includes a flame retardant layer, a wear-resistant layer, a waterproof layer and a reinforcing mesh layer, as well as a receiving cavity for accommodating the hemostatic unit. The flame retardant function is provided by a flame retardant layer composed of polyester amine and resin flame retardant; the antibacterial property is achieved by antibacterial cotton pasted under the breathable cotton; and the hemostatic function depends on the hemostatic cotton in the receiving cavity. The main limitations include that the complex structure may increase production costs, environmental issues, durability needs to be verified, and may affect comfort and breathability. In addition, cost-effectiveness and versatility are also issues that need to be considered.

[0004] Chinese patent CN202211618176-Alginate modified regenerated fiber, its preparation method, use, flame retardant material, hemostatic and or antibacterial material, using alginate to modify regenerated fiber, through a specific preparation method, the fiber has flame retardant, antibacterial and hemostatic functions. The preparation process includes mixing alginate nano-dispersion with a cellulose solvent, and then mixing it with cellulose pulp to make a spinning solution, and finally spinning it into modified fiber. The flame retardant function comes from the addition of alginate, especially the mass percentage of calcium alginate or zinc alginate ≥20%, which increases the oxygen index of the fiber to ≥28. Antibacterial and hemostatic functions are inherent characteristics of alginate, which can promote blood coagulation and have antibacterial effects. Technical limitations include the relatively high production cost of alginate modified regenerated fiber, and the stability and uniform dispersion of alginate may affect the final performance of the fiber.

[0005] Chinese Patent CN201310546376 - A composite silk fabric containing mulberry silk, down and seaweed fiber, a composite silk fabric containing mulberry silk, down and seaweed fiber. The warp uses mulberry silk, and the weft is a blended yarn of down and seaweed fiber, with down accounting for 50-60% and seaweed fiber accounting for 40-50%. The flame retardant function is due to the good flame retardancy of seaweed fiber; the antibacterial and hemostatic functions are attributed to the large amount of calcium ions contained in seaweed fiber, which can exchange with sodium ions in the blood, thereby achieving hemostasis and promoting wound healing. Technical limitations may include high material costs because of the use of natural mulberry silk and down, as well as the special properties of seaweed fiber. In addition, the large-scale production of composite fabrics may face technical and cost challenges, and the washability and durability of down and mulberry silk may not be as good as synthetic fibers.

[0006] Based on this, a multifunctional blended yarn for emergency rescue and a preparation method thereof are now provided, which can eliminate the disadvantages of the prior art. Summary of the invention

[0007] The purpose of the present invention is to provide a multifunctional blended yarn for emergency rescue and a preparation method thereof, which solves the problem of unsatisfactory yarn performance in the prior art.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A method for preparing a multifunctional blended yarn for emergency rescue comprises the following steps:

[0010] Step 1: Surface treatment of regenerated cellulose fibers;

[0011] Step 2: depositing porous calcium carbonate on the surface of regenerated cellulose fibers by an in situ synthesis method;

[0012] Step three: blending the treated modified regenerated cellulose fiber with chitosan fiber to obtain the target product.

[0013] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0014] In an optional solution: the regenerated cellulose fiber refers to viscose fiber, lyocell fiber, modal fiber or bamboo fiber, with a fineness of 1.1 to 4.5 dtex and a length of 25 to 80 mm.

[0015] In an optional solution: the chitosan fiber is chitosan fiber obtained by wet spinning of chitosan, with a fineness of 1.11-6.66 dtex, a length of 25-80 mm, and a deacetylation degree greater than 95%.

[0016] In an optional solution: the surface treatment of the regenerated cellulose fiber refers to soaking the regenerated cellulose fiber in a 0.1-0.5 mol / L sodium hydroxide aqueous solution for 6-12 hours and quickly drying it.

[0017] In an optional scheme: the in-situ synthesis of porous calcium carbonate deposition refers to immersing the surface-treated regenerated cellulose fiber in an acetic acid aqueous solution containing 0.5-1 mol / L calcium chloride and 0.01-0.02 mol / L chitosan, wherein the concentration of acetic acid is 0.1-0.5 mol / L, and then gradually adding a NaHCO3 aqueous solution with a concentration of 1-2 mol / L.

[0018] In an optional solution, the porous calcium carbonate deposition refers to porous spherical calcium carbonate particles with a diameter of 200-500 nm, and the calcium carbonate particles have a porous structure with an internal diameter of 5-20 nm.

[0019] A multifunctional blended yarn for emergency rescue is obtained by sampling the above preparation method.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a multifunctional blended yarn for emergency rescue and a preparation method thereof. The yarn realizes the multifunctional integration of antibacterial, flame retardant and hemostatic properties through an innovative material combination. This patent uses regenerated cellulose fiber and chitosan fiber to blend, and uses an in-situ synthesis method to compound porous calcium carbonate onto the surface of cellulose fiber, and uses an environmentally friendly flame retardant finishing agent for treatment, which not only enhances the flame retardant properties of the yarn, but also maintains the softness and air permeability of the yarn. Compared with the prior art, the yarn of the present invention has better environmental friendliness, lasting functionality and higher comfort, and provides a new type of efficient, environmentally friendly and safe yarn solution for the field of emergency rescue. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a processing flow chart of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1:

[0025] Preparation of modified regenerated cellulose fibers:

[0026] Take 100g of viscose fiber as the source of regenerated cellulose fiber, with a fineness of 1.1dtex and a length of 38mm. Soak the viscose fiber in a 0.3mol / L sodium hydroxide aqueous solution for 8 hours for surface treatment. Quickly dry the treated fiber to remove excess moisture. Soak the dried fiber in an acetic acid aqueous solution containing 0.5mol / L calcium chloride and 0.015mol / L chitosan, with an acetic acid concentration of 0.3mol / L. Gradually add a 1.5mol / L NaHCO3 aqueous solution until the pH value reaches 7 to promote the deposition of porous calcium carbonate. After 4 hours, take out the fiber, wash it to remove unreacted chemicals, and dry it to obtain a modified regenerated cellulose fiber with porous calcium carbonate deposited on the fiber surface. The porous calcium carbonate deposition refers to porous spherical calcium carbonate particles with a diameter of 200nm, and the calcium carbonate particles are a porous structure of 5nm inside.

[0027] Preparation of chitosan fibers:

[0028] Chitosan fiber with a fineness of 1.11 dtex, a length of 38 mm, and a deacetylation degree of 98% is obtained. The obtained modified regenerated cellulose fiber is mixed with the chitosan fiber in proportion, wherein the mass percentage of the modified regenerated cellulose fiber is 65wt%, the calcium ion content is 12wt% of the modified regenerated cellulose fiber, and the mass percentage of the chitosan fiber is 35wt%. During the mixing process, ensure that the fibers are fully mixed and uniform. The mixed fibers are spun to obtain a multifunctional blended yarn.

[0029] Performance Test:

[0030] The limiting oxygen index of the obtained multifunctional blended yarn was tested and the result was 29, which met the flame retardant requirements.

[0031] The antibacterial properties of the yarn were tested using GB / T 20944.3-2008. The results showed that the antibacterial rates of the blended yarn against Staphylococcus aureus and Escherichia coli were 99% and 98%, respectively.

[0032] The hemostatic performance of the yarn was tested using the rat tail-docking experiment as a model. The results showed that the hemostatic time of the blended yarn product was 1465s, and the blood absorption volume was 1368mg; the hemostatic time of the control gauze was 3898s, and the blood absorption volume was 93914mg; this shows that the hemostatic performance of the blended yarn is significantly better than that of medical gauze, and has a better hemostatic effect.

[0033] Embodiment 2:

[0034] Preparation of modified regenerated cellulose fibers:

[0035] Take 120g modal fiber as the source of regenerated cellulose fiber, its fineness is 3.0dtex, length is 50mm. Modal fiber is soaked in 0.4mol / L sodium hydroxide aqueous solution for 10 hours and surface treated. After rapid drying, the fiber is soaked in an acetic acid aqueous solution containing 0.8mol / L calcium chloride and 0.02mol / L chitosan, and the acetic acid concentration is 0.4mol / L. 2.0mol / L NaHCO3 aqueous solution is gradually added until the pH value reaches 7, which promotes the deposition of porous calcium carbonate. After 5 hours, the fiber is taken out, cleaned and dried to obtain a modified regenerated cellulose fiber with porous calcium carbonate deposited on the fiber surface. The porous calcium carbonate deposition refers to a porous spherical calcium carbonate particle with a diameter of 300nm, and the calcium carbonate particle is an internal 10nm porous structure.

[0036] Preparation of chitosan fibers:

[0037] Chitosan fiber with a fineness of 1.5 dtex, a length of 50 mm, and a deacetylation degree of 97% is taken. Modified regenerated cellulose fiber and chitosan fiber are mixed in proportion, wherein the mass percentage of the modified regenerated cellulose fiber is 70wt%, the calcium ion content is 11wt% of the modified regenerated cellulose fiber, and the mass percentage of the chitosan fiber is 30wt%. After uniform mixing, spinning is performed to obtain a multifunctional blended yarn.

[0038] Performance Test:

[0039] The limiting oxygen index test result is 29, which meets higher flame retardant requirements.

[0040] The antibacterial performance test showed that the antibacterial rates against Staphylococcus aureus and Escherichia coli were 98% and 97% respectively.

[0041] The results of the hemostatic performance test showed that the hemostatic time of the blended yarn product was 135±6s and the blood absorption volume was 125±7mg, which was better than the control gauze.

[0042] Embodiment 3:

[0043] Preparation of modified regenerated cellulose fibers:

[0044] Take 100g bamboo fiber as the source of regenerated cellulose fiber, the fineness is 2.5dtex, the length is 60mm. The bamboo fiber is soaked in a 0.2mol / L sodium hydroxide aqueous solution for 7 hours for surface treatment. After rapid drying, the fiber is soaked in an acetic acid aqueous solution containing 0.6mol / L calcium chloride and 0.01mol / L chitosan, and the acetic acid concentration is 0.1mol / L. 1.0mol / L NaHCO3 aqueous solution is gradually added until the pH value reaches 7 to promote the deposition of porous calcium carbonate. After 3 hours, the fiber is taken out, washed and dried to obtain a modified regenerated cellulose fiber with porous calcium carbonate deposited on the fiber surface. The porous calcium carbonate deposition refers to porous spherical calcium carbonate particles with a diameter of 250nm, and the calcium carbonate particles are a porous structure of 15nm inside.

[0045] Preparation of chitosan fibers:

[0046] Chitosan fiber with a fineness of 2.2 dtex, a length of 60 mm, and a deacetylation degree of 96% is taken. Modified regenerated cellulose fiber and chitosan fiber are mixed in proportion, wherein the mass percentage of the modified regenerated cellulose fiber is 68wt%, the calcium ion content is 10wt% of the modified regenerated cellulose fiber, and the mass percentage of the chitosan fiber is 32wt%. After uniform mixing, spinning is performed to obtain a multifunctional blended yarn.

[0047] Performance Testing:

[0048] The limiting oxygen index test result is 28, which meets the flame retardant requirements.

[0049] The antibacterial performance test showed that the antibacterial rates against Staphylococcus aureus and Escherichia coli were 98% and 97% respectively.

[0050] The results of the hemostatic performance test showed that the hemostatic time of the blended yarn product was 150±7s and the blood absorption volume was 140±9mg, which was better than the control gauze.

[0051] Embodiment 4:

[0052] Preparation of modified regenerated cellulose fibers:

[0053] Take 150g lyocell fiber as the source of regenerated cellulose fiber, its fineness is 1.3dtex, length is 25mm. Lyocell fiber is soaked in 0.5mol / L sodium hydroxide aqueous solution for 9 hours and surface treated. After rapid drying, fiber is soaked in acetic acid aqueous solution containing 0.9mol / L calcium chloride and 0.018mol / L chitosan, and acetic acid concentration is 0.45mol / L. 1.8mol / L NaHCO3 aqueous solution is progressively added until pH value reaches 7, promotes porous calcium carbonate deposition. After 4.5 hours, take out fiber, wash and dry, obtain modified regenerated cellulose fiber with porous calcium carbonate deposition on fiber surface. Described porous calcium carbonate deposition refers to porous spherical calcium carbonate particles with a diameter of 300nm, and calcium carbonate particles are internal 15nm porous structures.

[0054] Preparation of chitosan fibers:

[0055] Chitosan fiber with a fineness of 3.3 dtex, a length of 25 mm, and a deacetylation degree of 95% is taken. Modified regenerated cellulose fiber and chitosan fiber are mixed in proportion, wherein the mass percentage of the modified regenerated cellulose fiber is 60wt%, the calcium ion content is 15wt% of the modified regenerated cellulose fiber, and the mass percentage of the chitosan fiber is 40wt%. After uniform mixing, spinning is performed to obtain a multifunctional blended yarn.

[0056] Performance Testing:

[0057] The limiting oxygen index test result is 30, which meets the flame retardant requirements.

[0058] The antibacterial performance test shows that the antibacterial rates against Staphylococcus aureus and Escherichia coli are 99% and 99% respectively.

[0059] The results of the hemostatic performance test showed that the hemostatic time of the blended yarn product was 160±8s and the blood absorption volume was 150±10mg, which was better than the control gauze.

[0060] Embodiment 5:

[0061] Preparation of modified regenerated cellulose fibers:

[0062] Take 120g of viscose fiber as the source of regenerated cellulose fiber, with a fineness of 4.5dtex and a length of 80mm. Soak the viscose fiber in a 0.1mol / L sodium hydroxide aqueous solution for 12 hours for surface treatment. After rapid drying, soak the fiber in an acetic acid aqueous solution containing 1.0mol / L calcium chloride and 0.02mol / L chitosan, with an acetic acid concentration of 0.5mol / L. Gradually add a 1.8mol / L NaHCO3 aqueous solution until the pH value reaches 7 to promote the deposition of porous calcium carbonate. After 12 hours, take out the fiber, wash and dry it to obtain a modified regenerated cellulose fiber with porous calcium carbonate deposited on the fiber surface. The porous calcium carbonate deposition refers to porous spherical calcium carbonate particles with a diameter of 500nm, and the calcium carbonate particles are a porous structure of 20nm inside.

[0063] Preparation of chitosan fibers:

[0064] Chitosan fiber with a fineness of 6.66 dtex, a length of 80 mm, and a deacetylation degree of 99% is taken. Modified regenerated cellulose fiber and chitosan fiber are mixed in proportion, wherein the mass percentage of the modified regenerated cellulose fiber is 75wt%, the calcium ion content is 20wt% of the modified regenerated cellulose fiber, and the mass percentage of the chitosan fiber is 25wt%. After uniform mixing, spinning is performed to obtain a multifunctional blended yarn.

[0065] Performance Test:

[0066] The limiting oxygen index test result is 30, which meets higher flame retardant requirements.

[0067] The antibacterial performance test showed that the antibacterial rates against Staphylococcus aureus and Escherichia coli were 97% and 96% respectively.

[0068] The results of the hemostatic performance test showed that the hemostatic time of the blended yarn product was 130±6s, and the blood absorption volume was 120±7mg, which was better than the control gauze. The antibacterial rate 1 was the rate of Staphylococcus aureus; the antibacterial rate 2 was the antibacterial rate of Escherichia coli; the hemostatic time of the control gauze was 389±8s, and the blood absorption volume was 939±14mg.

[0069] Serial number / performance Limiting oxygen index Antibacterial rate 1 Antibacterial rate 2 Bleeding time Blood sucking amount gauze Example 1 29 99％ 98％ 146±5s 136±8mg 389±8s / 939±14mg Example 2 29 98％ 97％ 135±6s 125±7mg 389±8s / 939±14mg Example 3 28 98％ 97％ 150±7s 140±9mg 389±8s / 939±14mg Example 4 30 99％ 99％ 160±8s 150±10mg 389±8s / 939±14mg Example 5 30 97％ 96％ 130±6s 120±7mg 389±8s / 939±14mg

[0070] From the above, it can be seen that the flame retardant requirements in this application are excellent, the antibacterial ability is excellent, the hemostatic effect is significantly better than gauze, and it is suitable for emergency needs.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a multifunctional blended yarn for emergency rescue, characterized in that: The following steps are involved: Step 1: Surface treatment of regenerated cellulose fibers; Step 2: depositing porous calcium carbonate on the surface of regenerated cellulose fibers by an in situ synthesis method; Step three: blending the treated modified regenerated cellulose fiber with chitosan fiber to obtain the target product.

2. The method for preparing the multifunctional blended yarn for emergency rescue according to claim 1, characterized in that: The regenerated cellulose fiber refers to viscose fiber, lyocell fiber, modal fiber or bamboo fiber, with a fineness of 1.1 to 4.5 dtex and a length of 25 to 80 mm.

3. The method for preparing the multifunctional blended yarn for emergency rescue according to claim 1, characterized in that: The chitosan fiber is chitosan fiber obtained by wet spinning of chitosan, with a fineness of 1.11-6.66 dtex, a length of 25-80 mm, and a deacetylation degree greater than 95%.

4. The method for preparing the multifunctional blended yarn for emergency rescue according to claim 1, characterized in that: The surface treatment of the regenerated cellulose fiber refers to soaking the regenerated cellulose fiber in a 0.1-0.5 mol / L sodium hydroxide aqueous solution for 6-12 hours and then rapidly drying it.

5. The method for preparing the multifunctional blended yarn for emergency rescue according to claim 1, characterized in that: The in-situ synthesis of porous calcium carbonate deposition refers to immersing the surface treated regenerated cellulose fiber in an acetic acid aqueous solution containing 0.5-1 mol / L calcium chloride and 0.01-0.02 mol / L chitosan, wherein the concentration of acetic acid is 0.1-0.5 mol / L, and then gradually adding a NaHCO3 aqueous solution with a concentration of 1-2 mol / L.

6. The method for preparing the multifunctional blended yarn for emergency rescue according to claim 1, characterized in that: The porous calcium carbonate deposition refers to porous spherical calcium carbonate particles with a diameter of 200-500 nm, and the calcium carbonate particles have a porous structure with an internal diameter of 5-20 nm.

7. A multifunctional blended yarn for emergency rescue, characterized in that: The sample is obtained by the preparation method described in any one of claims 1-6.

8. A cloth, characterized in that The sample is woven from the multifunctional blended yarn for emergency rescue as described in claim 7.

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