Preparation method and application of environment-friendly multifunctional basalt fiber / cotton fiber composite yarn

Abstract

The invention discloses a preparation method and application of environment-friendly multifunctional basalt fiber / cotton fiber composite yarn. According to the method, basalt fibers and cotton fibers with different linear densities are combined together by using a twisting machine, and a multifunctional bio-based impregnating compound is adopted for surface coating, so that cohesion among the fibers is enhanced, and the fibers have excellent strength, super-hydrophobicity, antibacterial property, chemical corrosion resistance, heat resistance, ultraviolet aging resistance, air permeability and comfort. The produced composite yarn has excellent knitting and weaving performance, and is an ideal choice for application of various garments and industrial textiles.

Description

Technical Field

[0001] The present invention relates to a preparation method and application of an environment-friendly multifunctional basalt fiber / cotton fiber composite yarn. Background Art

[0002] Multifunctional textile yarns and fabrics made from natural fibers have received extensive attention in the fields of textiles, medicine, new energy, aerospace, etc. due to their light weight, low price, biodegradability, and sustainability. Cotton fiber is a renewable resource with advantages such as biodegradability, high elongation, flexibility, excellent cohesion, good wettability, and comfort. However, cotton fiber also has some limitations, including low strength, easy wrinkling, and shrinkage after washing. To address these issues, the textile industry blends cotton fiber with chemical fibers. However, synthetic fibers are not sustainable, energy-consuming, pollute the environment, and lack the technical properties required for high-end applications. Basalt fiber is a high-performance fiber prepared by high-temperature melting and drawing of natural basalt ore. In recent years, it has been widely used in various engineering fields due to its excellent heat resistance, high strength, acid and alkali resistance, corrosion resistance, ultraviolet resistance, fire resistance, moisture resistance, environmental friendliness, and lower cost compared with other high-performance fibers. However, the low elongation, poor touch, small cohesion, low hygroscopicity, and brittleness of basalt fiber limit its application in clothing and industrial textiles.

[0003] The combination of high-performance basalt fibers and cotton fibers provides a solution to improve the weaknesses of each fiber and produce new materials with excellent mechanical, thermal, chemical, and comfort properties. Different spinning techniques can be used to manufacture composite yarns of basalt fibers and cotton fibers. Chinese Invention Patent CN113564791A discloses a production process for basalt fiber-cotton fiber blended yarns, including the following steps: using drawn processed basalt fibers and cotton fibers as raw materials, making a coarser blended yarn with a roving frame, twisting it on a spinning frame to obtain a blended fine yarn, and finally performing steam, antistatic treatment, and weaving to prepare a woven fabric. For knitted fabrics, it also includes pretreating basalt fibers with an imidazoline surfactant, nitrate, and deionized water. Cotton yarn fibers are sized using a uniformly mixed and stirred solution of starch or polyvinyl alcohol sizing agents and paraffin or acrylic lubricants, then bleached using carbohydrate oxidase in an aqueous medium to remove the sizing agents, and then dyed to produce a knitted fabric. Another Chinese Invention Patent CN116288868A discloses a composite fabric with a wrapped structure using basalt fibers as the core yarn and cotton fibers as the outer wrapped yarn. This technology includes alkali cooking the wrapped yarn with one or more of sodium hydroxide, ammonia water, and Triton, and then bleaching it with one or more of sodium hypochlorite, hydrogen peroxide, and peroxyacid. Finally, it is treated with an antistatic agent composed of one or more of sulfonates, phosphates, chitosan, and quaternary ammonium salts. Subsequently, dehydration and drying are carried out to obtain the final composite yarn.

[0004] However, most of the current basalt fiber-cotton fiber blending techniques are time-consuming, resulting in wasted time and high processing costs. In addition, the chemicals used in each stage also cause environmental pollution. Moreover, due to the imbalance in flexural force between the two fibers and the low cohesion characteristics of basalt fibers, it is difficult for basalt fiber-cotton fiber blended yarns to achieve high twist and strength. In the drafting zones of draw frames, roving frames, and spinning frames, the brittleness of basalt fibers makes them easily damaged, leading to breaks and reduced strength in the final blended yarn. Similarly, in the wrapped structure, when the fibers pass through the front roller of a ring spinning frame, the surface of basalt fibers also develops defect structures due to frictional effects.

[0005] The present invention discloses a preparation method and application of an environment-friendly multifunctional basalt fiber / cotton fiber composite yarn. The method includes directly twisting basalt fiber and cotton fiber using a twisting machine without any pretreatment. Subsequently, an environment-friendly bio-based multifunctional sizing agent is coated on the surface of the yarn to make woven or knitted yarn. This method provides a large-scale production strategy with low processing costs and can minimize the damage to basalt fiber during the twisting process. In addition, the cohesion between basalt fiber and cotton fiber is improved, thereby enhancing the strength and elongation of the composite yarn, and also providing other multifunctional properties such as antibacterial and hydrophobic properties. By utilizing sustainable resources, the new multifunctional bio-based sizing agent and the blending technology of two natural fibers promote environment-friendly production, aiming to develop a new generation of green textile functional materials. Summary of the Invention

[0006] The present invention discloses a preparation method and application of an environment-friendly multifunctional basalt fiber / cotton fiber composite yarn. The method combines multiple strands of basalt fiber with cotton fibers of different thicknesses using a twisting machine, and then performs sizing treatment with a bio-based sizing agent with multiple functions, thereby strengthening the adhesion between the fibers, making it have excellent waterproofness, antibacterial property, chemical resistance, heat resistance and ultraviolet resistance, low-cost and high-strength performance, while maintaining breathability and comfort. The yarn obtained by the method of the present invention is suitable for woven and knitted fabrics of clothing and industrial textiles and is suitable for various applications of clothing and industrial textiles.

[0007] The preparation method of an environment-friendly multifunctional basalt fiber / cotton fiber composite yarn described in the present invention is carried out according to the following steps:

[0008] Select basalt fiber and cotton fiber:

[0009] a. Select basalt fiber with a diameter of 5 - 21 μm and a linear density of 10 - 300 Tex, and select cotton fiber with a linear density of 3 - 198 Tex and a twist of 200 - 1600 TPM;

[0010] Prepare basalt fiber-cotton fiber composite yarn:

[0011] b. Use a twisting machine to twist the basalt fiber and cotton fiber selected in step a into one strand with a twist of 200 - 2200 TPM to obtain basalt fiber-cotton fiber composite yarn;

[0012] Prepare multifunctional sizing agent:

[0013] c. Prepare chitosan film-forming agent: Dissolve 0.5 - 4.0 g of deacetylated chitosan in 1.0 - 2.5 Vol% citric acid aqueous solution and stir at a speed of 1500 rpm for 1 h;

[0014] d. Preparation of hydrophobic film-forming agent: Add 0.25 - 1.00 g of octadecylamine to the solution obtained in step c, stir at a temperature of 50 °C and a rotation speed of 1500 rpm for 1 h to obtain a suspension;

[0015] e. Preparation of lubricant: Add 0.08 - 1.00 g of natural coconut oil to the suspension obtained in step d, stir at a temperature of 50 °C and a rotation speed of 1000 rpm for 20 min;

[0016] f. Preparation of coupling agent: Prepare an aqueous solution of glutaraldehyde with a concentration of 5 - 10 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40 °C and a speed of 800 rpm for 40 min to obtain a multifunctional sizing agent for basalt fiber - cotton fiber composite yarn;

[0017] g. Coat the multifunctional sizing agent obtained in step f on the surface of the basalt fiber - cotton fiber composite yarn obtained in step b, and dry and cure it at a temperature of 120 °C for 12 h to obtain a bio - based multifunctional basalt fiber - cotton fiber composite yarn.

[0018] Application of the multifunctional basalt fiber - cotton fiber composite yarn obtained by the said method in the preparation of woven and knitted fabrics suitable for clothing and industrial textiles.

[0019] Advantages of the present invention compared with the prior art:

[0020] 1. Compared with the existing methods, the present invention provides a simpler, faster and more environmentally friendly method for preparing high - performance basalt fiber - cotton fiber composite yarn. Directly twisting the fibers using a twisting machine omits complex multiple processes and avoids the corrosion of fibers by chemicals. This method minimizes the damage to basalt fibers, and finally increases the strength of the yarn to 60 cN / Tex and the elongation rate of the composite yarn reaches 6.8%.

[0021] 2. The novel bio - based multifunctional sizing agent enhances the cohesion between fibers, further improves the strength of the composite yarn, and the strength increase rate can reach up to 50.2%. And the composite yarn has many excellent properties. For example, according to the AATCC 100 standard, its antibacterial property against Escherichia coli is as high as 97.7%, and against Staphylococcus aureus is as high as 99.9%; the contact angle with water is 90 0 -168 0 °; according to the ISO 4892 - 3 standard, the anti - ultraviolet performance of the sample is as high as 99%; after contacting different chemical substances, the strength retention rate is as high as 80 - 99%.

[0022] 3. The obtained bio-based multifunctional basalt fiber-cotton fiber composite yarn is used to prepare a woven fabric by an automatic shuttleless loom, endowing it with superhydrophobicity, antibacterial property, ultraviolet resistance, chemical corrosion resistance, heat resistance, breathability and comfort;

[0023] The knitted fabric prepared from the obtained bio-based multifunctional basalt fiber-cotton fiber composite yarn has the same advantageous properties as the woven fabric: superhydrophobicity, antibacterial property, ultraviolet resistance, chemical corrosion resistance, heat resistance, breathability and comfort. It can be used for clothing and industrial textiles in various engineering fields.

[0024] In summary, the present invention achieves better effects than the prior art while promoting sustainable development and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the present invention, where 1 - composite yarn of twisted basalt fiber and cotton fiber; 2 - basalt fiber-cotton fiber composite yarn prepared with different ratios, linear densities and twist degrees; 3 - basalt fiber-cotton fiber composite yarn coated with a multifunctional sizing agent; 4 - multifunctional basalt fiber-cotton fiber composite woven fabric; 5 - multifunctional basalt fiber-cotton fiber composite knitted fabric. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention will be further described below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but they are only the preferred embodiments of the present invention and do not limit the present invention in any form. Therefore, all equivalent changes made according to the features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

[0027] Example 1

[0028] Select basalt fiber and cotton fiber:

[0029] a. Select basalt fiber with a diameter of 5 μm and a linear density of 10 Tex, which is the number of grams of yarn with a length of 1000 meters at the official regain, and select cotton fiber with a linear density of 3 Tex and a twist of 200 TPM, which is the number of twists per meter of the yarn;

[0030] Prepare basalt fiber-cotton fiber composite yarn:

[0031] b. Use a twister to twist the basalt fiber and cotton fiber selected in step a into one strand with a twist of 2200 TPM to obtain a basalt fiber-cotton fiber composite yarn;

[0032] Preparation of multifunctional sizing agent:

[0033] c. Preparation of chitosan film-forming agent: Dissolve 0.5 g of deacetylated chitosan in 1.0 Vol% citric acid aqueous solution and stir at a speed of 1500 rpm for 1 h;

[0034] d. Preparation of hydrophobic film-forming agent: Add 0.25 g of octadecylamine to the solution obtained in step c, stir at a temperature of 50 °C and a speed of 1500 rpm for 1 h to obtain a suspension;

[0035] e. Preparation of lubricant: Add 0.08 g of natural coconut oil to the suspension obtained in step d, stir at a temperature of 50 °C and a speed of 1000 rpm for 20 min;

[0036] f. Preparation of coupling agent: Prepare an aqueous solution of glutaraldehyde with a concentration of 5 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40 °C and a speed of 800 rpm for 40 min to obtain a multifunctional sizing agent for basalt fiber-cotton fiber composite yarn;

[0037] g. Coat the multifunctional sizing agent obtained in step f on the surface of the basalt fiber-cotton fiber composite yarn obtained in step b, and dry and cure at a temperature of 120 °C for 12 h to obtain a bio-based multifunctional basalt fiber-cotton fiber composite yarn.

[0038] The toughness of the obtained multifunctional basalt fiber-cotton fiber composite yarn is increased by 19%. Compared with the unsized yarn, due to the finer yarn count, it is more suitable for woven and knitted fabrics. According to the ISO 4892-3 standard, the antibacterial rate of the finally sized composite yarn against Escherichia coli is 97%, the antibacterial rate against Staphylococcus aureus is 100%, and the waterproof property is 90 0 , and the ultraviolet protection rate at a wavelength of 340 nm is as high as 99%. The strength retention rate after being placed in 3 mol HCl and 3 mol NaOH for 1 h is as high as 80%.

[0039] Example 2

[0040] Selection of basalt fiber and cotton fiber:

[0041] a. Select basalt fiber with a diameter of 5 μm and a linear density of 12 Tex, that is, the number of grams of the weight of 1000 m long yarn at the standard regain, and select cotton fiber with a linear density of 6 Tex and a twist of 250 TPM, that is, the number of turns of twist of the yarn within 1 m length;

[0042] Preparation of basalt fiber-cotton fiber composite yarn:

[0043] b. Use a twister to twist the basalt fiber and cotton fiber selected in step a into one strand with a twist of 600 TPM to obtain a basalt fiber-cotton fiber composite yarn;

[0044] Preparation of Multifunctional Sizing Agent:

[0045] c. Preparation of chitosan film-forming agent: Dissolve 1 g of deacetylated chitosan in an aqueous solution of 1.5 Vol% citric acid, and stir for 1 h at a rotation speed of 1500 rpm;

[0046] d. Preparation of hydrophobic film-forming agent: Add 0.5 g of octadecylamine to the solution obtained in step c, and stir at a temperature of 50 °C and a rotation speed of 1500 rpm for 1 h to obtain a suspension;

[0047] e. Preparation of lubricant: Add 0.16 g of natural coconut oil to the suspension obtained in step d, and stir at a temperature of 50 °C and a rotation speed of 1000 rpm for 20 min;

[0048] f. Preparation of coupling agent: Prepare an aqueous solution of glutaraldehyde with a concentration of 5 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40 °C and a speed of 800 rpm for 40 min to obtain a multifunctional sizing agent for basalt fiber-cotton fiber composite yarn;

[0049] g. Coat the multifunctional sizing agent obtained in step f on the surface of the basalt fiber-cotton fiber composite yarn obtained in step b, and dry and cure at a temperature of 120 °C for 12 h to obtain a bio-based multifunctional basalt fiber-cotton fiber composite yarn.

[0050] The toughness of the obtained bio-based multifunctional basalt fiber-cotton fiber composite yarn is increased by 33%. Compared with the unsized yarn, it is more suitable for knitted fabrics. The antibacterial rate of the finally sized composite yarn against Escherichia coli is 97.7%, the antibacterial rate against Staphylococcus aureus is 99.9%, the waterproof property is 120 0 , and the sun protection rate is as high as 98.9% under ultraviolet light with a wavelength of 340 nm. After being placed in 3 mol HCl and 3 mol NaOH for 1 h, the strength retention rate is as high as 85%.

[0051] Example 3

[0052] Selection of basalt fiber and cotton fiber:

[0053] a. Select basalt fiber with a diameter of 5 μm and a linear density of 14 Tex, that is, the number of grams of yarn with a length of 1000 m at the standard regain, and select cotton fiber with a linear density of 14 Tex and a twist of 300 TPM, that is, the number of twists per meter of yarn;

[0054] Preparation of basalt fiber-cotton fiber composite yarn:

[0055] b. Use a twisting machine to twist the basalt fiber and cotton fiber selected in step a into one strand with a twist of 1600 TPM to obtain a basalt fiber-cotton fiber composite yarn;

[0056] Preparation of multifunctional sizing agent:

[0057] c. Preparation of chitosan film-forming agent: Dissolve 3.0 g of deacetylated chitosan in an aqueous solution of 1.8 Vol% citric acid and stir at a speed of 1500 rpm for 1 h;

[0058] d. Preparation of hydrophobic film-forming agent: Add 0.25 g of octadecylamine to the solution obtained in step c, stir at a temperature of 50 °C and a speed of 1500 rpm for 1 h to obtain a suspension;

[0059] e. Preparation of lubricant: Add 0.2 g of natural coconut oil to the suspension obtained in step d, stir at a temperature of 50 °C and a speed of 1000 rpm for 20 min;

[0060] f. Preparation of coupling agent: Prepare an aqueous solution of glutaraldehyde with a concentration of 6 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40 °C and a speed of 800 rpm for 40 min to obtain a multifunctional sizing agent for basalt fiber-cotton fiber composite yarn;

[0061] g. Coat the multifunctional sizing agent obtained in step f on the surface of the basalt fiber-cotton fiber composite yarn obtained in step b, and dry and cure it at a temperature of 120 °C for 12 h to obtain a bio-based multifunctional basalt fiber-cotton fiber composite yarn.

[0062] The toughness of the obtained bio-based multifunctional basalt fiber-cotton fiber composite yarn is increased by 50.2%. Compared with the unsized yarn, it is applicable to both woven and knitted fabrics. The antibacterial rate of the finally sized composite yarn against Escherichia coli is 97.7%, the antibacterial rate against Staphylococcus aureus is 100%, the waterproof property is 120 0 , and the ultraviolet protection rate at a wavelength of 340 nm is as high as 99%. After being placed in 3 mol HCl and 3 mol NaOH for 1 h, its strength retention rate is as high as 99%.

[0063] Example 4

[0064] Selection of basalt fiber and cotton fiber:

[0065] a. Select basalt fiber with a diameter of 10 μm and a linear density of 50 Tex, which is the number of grams of the weight of 1000 m long yarn at the standard regain, and select cotton fiber with a linear density of 36 Tex and a twist of 500 TPM, which is the number of twists per meter of the yarn;

[0066] Preparation of basalt fiber-cotton fiber composite yarn:

[0067] b. Use a twisting machine to twist the basalt fiber and cotton fiber selected in step a into one strand with a twist of 1000 TPM to obtain a basalt fiber-cotton fiber composite yarn;

[0068] Preparation of multifunctional sizing agent:

[0069] c. Preparation of chitosan film-forming agent: Dissolve 2.0 g of deacetylated chitosan in 2.0 Vol% citric acid aqueous solution, and stir at a speed of 1500 rpm for 1 h;

[0070] d. Preparation of hydrophobic film-forming agent: Add 1.00 g of octadecylamine to the solution obtained in step c, stir at a temperature of 50 °C and a speed of 1500 rpm for 1 h to obtain a suspension;

[0071] e. Preparation of lubricant: Add 0.75 g of natural coconut oil to the suspension obtained in step d, and stir at a temperature of 50 °C and a speed of 1000 rpm for 20 min;

[0072] f. Preparation of coupling agent: Prepare an aqueous solution of glutaraldehyde with a concentration of 7 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40 °C and a speed of 800 rpm for 40 min to obtain a multifunctional sizing agent for basalt fiber-cotton fiber composite yarn;

[0073] g. Coat the multifunctional sizing agent obtained in step f on the surface of the basalt fiber-cotton fiber composite yarn obtained in step b, and dry and cure at a temperature of 120 °C for 12 h to obtain a bio-based multifunctional basalt fiber-cotton fiber composite yarn.

[0074] The strength of the bio-based multifunctional basalt fiber-cotton fiber composite yarn is increased by 29%. The antibacterial rate of the finally sized composite yarn against Escherichia coli is 96%, the antibacterial rate against Staphylococcus aureus is 99.8%, and the waterproof property is 135 0 , and the ultraviolet protection rate at a wavelength of 340 nm is as high as 95%. After being placed in 3 mol HCl and 3 mol NaOH for 1 h, its strength retention rate is as high as 99%.

[0075] Example 5

[0076] Selection of basalt fiber and cotton fiber:

[0077] a. Select basalt fiber with a diameter of 15 μm and a linear density of 196 Tex, which is the number of grams of yarn weighing 1000 meters long at the standard regain, and select cotton fiber with a linear density of 72 Tex and a twist of 800 TPM, which is the number of twists per meter of the yarn;

[0078] Preparation of basalt fiber-cotton fiber composite yarn:

[0079] b. Use a twister to twist the basalt fiber and cotton fiber selected in step a into one strand with a twist of 400 TPM to obtain a basalt fiber-cotton fiber composite yarn;

[0080] Preparation of multifunctional sizing agent:

[0081] c. Preparation of chitosan film-forming agent: Dissolve 3.0 g of deacetylated chitosan in 2.5 Vol% citric acid aqueous solution and stir at a speed of 1500 rpm for 1 h;

[0082] d. Preparation of hydrophobic film-forming agent: Add 0.25 g of octadecylamine to the solution obtained in step c, stir at a temperature of 50 °C and a speed of 1500 rpm for 1 h to obtain a suspension;

[0083] e. Preparation of lubricant: Add 0.5 g of natural coconut oil to the suspension obtained in step d, stir at a temperature of 50 °C and a speed of 1000 rpm for 20 min;

[0084] f. Preparation of coupling agent: Prepare an aqueous solution of glutaraldehyde with a concentration of 8 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40 °C and a speed of 800 rpm for 40 min to obtain a multifunctional sizing agent for basalt fiber-cotton fiber composite yarn;

[0085] g. Coat the multifunctional sizing agent obtained in step f on the surface of the basalt fiber-cotton fiber composite yarn obtained in step b, and dry and cure it at a temperature of 120 °C for 12 h to obtain a bio-based multifunctional basalt fiber-cotton fiber composite yarn.

[0086] Although the twist of the obtained bio-based multifunctional basalt fiber-cotton fiber composite yarn is low, this method increases the strength of the composite yarn by 35%. The antibacterial rate of the finally sized composite yarn against Escherichia coli is 97.7%, the antibacterial rate against Staphylococcus aureus is 99.9%, and the waterproofness is 150 0 , and the ultraviolet protection rate at a wavelength of 340 nm is as high as 98%. After being placed in 3 mol HCl and 3 mol NaOH for 1 h, its strength retention rate is as high as 98%.

[0087] Example 6

[0088] Selection of basalt fiber and cotton fiber:

[0089] a. Select basalt fiber with a diameter of 17 μm and a linear density of 227 Tex (i.e., the number of grams of yarn with a length of 1000 m at the standard regain), and select cotton fiber with a linear density of 98 Tex and a twist of 1000 TPM (i.e., the number of turns per meter of yarn);

[0090] Preparation of basalt fiber-cotton fiber composite yarn:

[0091] b. Use a twister to twist the basalt fiber and cotton fiber selected in step a into one strand with a twist of 200 TPM to obtain a basalt fiber-cotton fiber composite yarn;

[0092] Preparation of multifunctional sizing agent:

[0093] c. Preparation of chitosan film former: Dissolve 4.0 g of deacetylated chitosan in 2.5 Vol% citric acid aqueous solution and stir at a speed of 1500 rpm for 1 h;

[0094] d. Preparation of hydrophobic film former: Add 0.75 g of octadecylamine to the solution obtained in step c, stir at a temperature of 50 °C and a speed of 1500 rpm for 1 h to obtain a suspension;

[0095] e. Preparation of lubricant: Add 0.08 g of natural coconut oil to the suspension obtained in step d, stir at a temperature of 50 °C and a speed of 1000 rpm for 20 min;

[0096] f. Preparation of coupling agent: Prepare an aqueous solution of glutaraldehyde with a concentration of 9 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40 °C and a speed of 800 rpm for 40 min to obtain a multifunctional sizing agent for basalt fiber-cotton fiber composite yarn;

[0097] g. Coat the multifunctional sizing agent obtained in step f on the surface of the basalt fiber-cotton fiber composite yarn obtained in step b, and dry and cure at a temperature of 120 °C for 12 h to obtain a bio-based multifunctional basalt fiber-cotton fiber composite yarn.

[0098] The sizing agent in the obtained bio-based multifunctional basalt fiber-cotton fiber composite yarn slightly improves the yarn strength, only 28%. The antibacterial rate of the finally sized composite yarn against Escherichia coli is 97%, the antibacterial rate against Staphylococcus aureus is 100%, and the waterproof property is 168 0 , and the ultraviolet protection rate at a wavelength of 340 nm is as high as 99%; after being placed in 3 mol HCl and 3 mol NaOH for 1 h, its strength retention rate is as high as 98%.

[0099] Example 7

[0100] Selection of basalt fiber and cotton fiber:

[0101] a. Select basalt fiber with a diameter of 20 μm and a linear density of 256 Tex (i.e., the number of grams of yarn with a length of 1000 m at the standard regain), and select cotton fiber with a linear density of 120 Tex and a twist of 1200 TPM (i.e., the number of turns of twist in 1 m of yarn);

[0102] Preparation of basalt fiber-cotton fiber composite yarn:

[0103] b. Use a twister to twist the basalt fiber and cotton fiber selected in step a into one strand with a twist of 600 TPM to obtain a basalt fiber-cotton fiber composite yarn;

[0104] Preparation of the multifunctional sizing agent:

[0105] c. Preparation of the chitosan film-forming agent: Dissolve 1.0 g of deacetylated chitosan in a 2.0 Vol% citric acid aqueous solution and stir at a speed of 1500 rpm for 1 h;

[0106] d. Preparation of the hydrophobic film-forming agent: Add 0.25 g of octadecylamine to the solution obtained in step c, stir at a temperature of 50 °C and a speed of 1500 rpm for 1 h to obtain a suspension;

[0107] e. Preparation of the lubricant: Add 0.16 g of natural coconut oil to the suspension obtained in step d, stir at a temperature of 50 °C and a speed of 1000 rpm for 20 min;

[0108] f. Preparation of the coupling agent: Prepare an aqueous solution of glutaraldehyde with a concentration of 10 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40 °C and a speed of 800 rpm for 40 min to obtain a multifunctional sizing agent for the basalt fiber-cotton fiber composite yarn;

[0109] g. Coat the multifunctional sizing agent obtained in step f on the surface of the basalt fiber-cotton fiber composite yarn obtained in step b, and dry and cure it at a temperature of 120 °C for 12 h to obtain a bio-based multifunctional basalt fiber-cotton fiber composite yarn.

[0110] The sizing agent in the bio-based multifunctional basalt fiber-cotton fiber composite yarn increases the toughness of the yarn by 22%. Due to its low twist and softness, it is more suitable for knitted fabrics. The antibacterial rate of the finally sized composite yarn against Escherichia coli is 95%, and the antibacterial rate against Staphylococcus aureus is 95%. The waterproof property is 110 0 , and the ultraviolet protection rate at a wavelength of 340 nm is as high as 90%. After being placed in 3 mol HCl and 3 mol NaOH for 1 h, its strength retention rate is as high as 80%.

[0111] Example 8

[0112] Selection of basalt fiber and cotton fiber:

[0113] a. Select basalt fiber with a diameter of 21 μm and a linear density of 300 Tex (i.e., the number of grams of yarn weighing 1000 m in the conditioned regain), and select cotton fiber with a linear density of 160 Tex and a twist of 1400 TPM (i.e., the number of twists per meter of yarn);

[0114] Preparation of basalt fiber-cotton fiber composite yarn:

[0115] b. Twist the basalt fiber and cotton fiber selected in step a into one strand using a twister with a twist of 800 TPM to obtain a basalt fiber-cotton fiber composite yarn;

[0116] Preparation of the multifunctional sizing agent:

[0117] c. Preparation of the chitosan film-forming agent: Dissolve 0.5 g of deacetylated chitosan in a 2.5 Vol% citric acid aqueous solution and stir at a speed of 1500 rpm for 1 h;

[0118] d. Preparation of the hydrophobic film-forming agent: Add 1.00 g of octadecylamine to the solution obtained in step c, stir at a temperature of 50 °C and a speed of 1500 rpm for 1 h to obtain a suspension;

[0119] e. Preparation of the lubricant: Add 0.5 g of natural coconut oil to the suspension obtained in step d, stir at a temperature of 50 °C and a speed of 1000 rpm for 20 min;

[0120] f. Preparation of the coupling agent: Prepare an aqueous solution of glutaraldehyde with a concentration of 10 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40 °C and a speed of 800 rpm for 40 min to obtain a multifunctional sizing agent for the basalt fiber-cotton fiber composite yarn;

[0121] g. Coat the multifunctional sizing agent obtained in step f on the surface of the basalt fiber-cotton fiber composite yarn obtained in step b, and dry and cure it at a temperature of 120 °C for 12 h to obtain a bio-based multifunctional basalt fiber-cotton fiber composite yarn.

[0122] The obtained bio-based multifunctional basalt fiber-cotton fiber composite yarn increases the toughness of the yarn by 35%, making it suitable for both woven and knitted fabrics. The antibacterial rate of the finally sized composite yarn against Escherichia coli is 85%, the antibacterial rate against Staphylococcus aureus is 90%, and the waterproof property is 90 0 , and the ultraviolet protection rate at a wavelength of 340 nm is as high as 90%. After being placed in 3 mol HCl and 3 mol NaOH for 1 h, its strength retention rate is as high as 80%.

[0123] Example 9

[0124] Select basalt fiber and cotton fiber:

[0125] a. Select basalt fiber with a diameter of 5 μm and a linear density of 10 Tex, which is the number of grams of yarn with a length of 1000 m at the standard regain, and select cotton fiber with a linear density of 180 Tex and a twist of 1600 TPM, which is the number of twists per meter of the yarn;

[0126] Preparation of basalt fiber-cotton fiber composite yarn:

[0127] b. Twist the basalt fiber and cotton fiber selected in step a into one strand using a twisting machine with a twist of 1600 TPM to obtain a basalt fiber-cotton fiber composite yarn;

[0128] Preparation of multifunctional sizing agent:

[0129] c. Preparation of chitosan film-forming agent: Dissolve 2.0 g of deacetylated chitosan in 1.0 Vol% citric acid aqueous solution and stir at a speed of 1500 rpm for 1 h;

[0130] d. Preparation of hydrophobic film-forming agent: Add 0.25 g of octadecylamine to the solution obtained in step c, stir at a temperature of 50 °C and a speed of 1500 rpm for 1 h to obtain a suspension;

[0131] e. Preparation of lubricant: Add 0.75 g of natural coconut oil to the suspension obtained in step d, stir at a temperature of 50 °C and a speed of 1000 rpm for 20 min;

[0132] f. Preparation of coupling agent: Prepare an aqueous solution of glutaraldehyde with a concentration of 5 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40 °C and a speed of 800 rpm for 40 min to obtain a multifunctional sizing agent for basalt fiber-cotton fiber composite yarn;

[0133] g. Coat the multifunctional sizing agent obtained in step f on the surface of the basalt fiber-cotton fiber composite yarn obtained in step b, and dry and cure it at a temperature of 120 °C for 12 h to obtain a bio-based multifunctional basalt fiber-cotton fiber composite yarn.

[0134] Obtaining the bio-based multifunctional basalt fiber-cotton fiber composite yarn increases the toughness of the yarn by 42%. Compared with the unsized yarn, both are suitable for woven and knitted fabrics. The antibacterial rate of the finally sized composite yarn against Escherichia coli is 96%, and the antibacterial rate against Staphylococcus aureus is 99%. The waterproof property is 155 0 , and the ultraviolet protection rate at a wavelength of 340 nm is as high as 99%. After being placed in 3 mol HCl and 3 mol NaOH for 1 h, its strength retention rate is as high as 95%.

[0135] Example 10

[0136] Selection of basalt fiber and cotton fiber:

[0137] a. Select basalt fiber with a diameter of 5 μm and a linear density of 12 Tex (i.e., the number of grams of yarn with a length of 1000 m at the standard regain), and select cotton fiber with a linear density of 198 Tex and a twist of 1200 TPM (i.e., the number of twists per meter of yarn);

[0138] Preparation of basalt fiber-cotton fiber composite yarn:

[0139] b. Twisting the basalt fiber and cotton fiber selected in step a into one strand by a twisting machine with a twist of 2200 TPM to obtain a basalt fiber-cotton fiber composite yarn;

[0140] Preparation of multifunctional sizing agent:

[0141] c. Preparation of chitosan film-forming agent: Dissolve 4.0 g of deacetylated chitosan in 2.5 Vol% citric acid aqueous solution and stir at a speed of 1500 rpm for 1 h;

[0142] d. Preparation of hydrophobic film-forming agent: Add 1.00 g of octadecylamine to the solution obtained in step c, stir at a temperature of 50 °C and a speed of 1500 rpm for 1 h to obtain a suspension;

[0143] e. Preparation of lubricant: Add 1.00 g of natural coconut oil to the suspension obtained in step d, stir at a temperature of 50 °C and a speed of 1000 rpm for 20 min;

[0144] f. Preparation of coupling agent: Prepare an aqueous solution of glutaraldehyde with a concentration of 5 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40 °C and a speed of 800 rpm for 40 min to obtain a multifunctional sizing agent for basalt fiber-cotton fiber composite yarn;

[0145] g. Coat the multifunctional sizing agent obtained in step f on the surface of the basalt fiber-cotton fiber composite yarn obtained in step b, and dry and cure it at a temperature of 120 °C for 12 h to obtain a bio-based multifunctional basalt fiber-cotton fiber composite yarn.

[0146] Example 11

[0147] The obtained bio-based multifunctional basalt fiber-cotton fiber composite yarn increases the toughness of the yarn by 17%, making it more suitable for woven and knitted fabrics for different uses; the antibacterial rate of the finally sized composite yarn against Escherichia coli is 97.7%, and the antibacterial rate against Staphylococcus aureus is 99.9%, and the waterproofness is 168 0 , and the ultraviolet protection rate at a wavelength of 340 nm is as high as 98%; after being placed in 3 mol HCl and 3 mol NaOH for 1 h, its strength retention rate is as high as 98%;

[0148] Table 1 Summary of data of examples

[0149]

[0150] As can be seen from the table: Using a twister to combine multiple strands of basalt fiber with cotton fibers of different thicknesses, and then sizing with a bio-based sizing agent with multiple functions can strengthen the cohesion between the fibers, further improve the strength of the composite yarn, and endow it with specific functionality.

Claims

1. A method for preparing an environmentally friendly multifunctional basalt fiber / cotton fiber composite yarn, characterized in that Follow these steps: Choose between basalt fiber and cotton fiber: a. Select basalt fiber with a diameter of 5-21μm and a linear density of 10-300Tex, and select cotton fiber with a linear density of 3-198Tex and a twist of 200-1600TPM; Preparation of basalt fiber-cotton fiber composite yarn: b. Using a twisting machine, the basalt fiber and cotton fiber selected in step a are twisted into one strand with a twist of 200-2200 TPM to obtain a basalt fiber-cotton fiber composite yarn; Preparation of multifunctional wetting agent: c. Preparation of chitosan film-forming agent: 0.5-4.0 g of deacetylated chitosan was dissolved in 1.0-2.5 Vol% citric acid aqueous solution and stirred at 1500 rpm for 1 h; d. Preparation of a hydrophobic film-forming agent: add 0.25-1.00 g of octadecylamine to the solution obtained in step c, stir at 50° C. and 1500 rpm for 1 h to obtain a suspension; e. Preparation of lubricant: Add 0.08-1.00 g natural coconut oil to the suspension obtained in step d, and stir at 50° C. and 1000 rpm for 20 min; f. Preparation of coupling agent: prepare a glutaraldehyde aqueous solution with a concentration of 5-10 Vol%, add it to the solution obtained in step e, and stir at a temperature of 40° C. and a speed of 800 rpm for 40 min to obtain a multifunctional wetting agent for basalt fiber-cotton fiber composite yarn; g. Apply the multifunctional impregnating agent obtained in step f to the surface of the basalt fiber-cotton fiber composite yarn obtained in step b, and dry and cure it at a temperature of 120° C. for 12 h to obtain a bio-based multifunctional basalt fiber-cotton fiber composite yarn.

2. Use of the multifunctional basalt fiber-cotton fiber composite yarn obtained according to the method of claim 1 in the preparation of woven and knitted fabrics suitable for clothing and industrial textiles.

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