A steaming process for high-tenacity polyester-cotton blended yarn

Abstract

This application relates to the technical field of blended yarns, specifically disclosing a steaming process for high-toughness polyester-cotton blended yarns. The steaming process for blended yarns includes the following steps: soaking the polyester-cotton blended yarn; placing the treated yarn into a steaming machine, setting the pressure to -40 to (-60) kPa and the temperature to 55 to 65°C, first heating with steam to 95% of the set temperature, then stopping steam heating and using electric heating to reach the set temperature, holding for 8 to 12 minutes; after the holding period, setting the pressure to -50 to (-60) kPa and the temperature to 70 to 90°C, first heating with steam to 90% of the set temperature, then stopping steam heating and using electric heating to reach the set temperature, holding for 8 to 12 minutes, and then cooling to complete the steaming process. The steaming process for polyester-cotton blended yarns in this application, through the synergistic effect between the steps, has the advantage of improving the toughness of the blended yarn.

Description

Technical Field

[0001] This application relates to the field of blended yarn technology, and in particular to a steaming process for high-toughness polyester-cotton blended yarn. Background Technology

[0002] Polyester-cotton blended yarn is a type of yarn made from a blend of polyester and cotton fibers. It combines the durability of polyester with the moisture absorption of cotton fibers, offering the advantages of comfort and durability. It is mainly used in various wool textiles, knitwear, and clothing, and is very popular.

[0003] In the production process of polyester-cotton blended yarn, steaming is required. Steaming refers to the process of using hot steam to set the shape of wool yarn and wool blended yarn. It is a wet heat treatment of fibers or yarns. Proper wet heat treatment has a certain impact on the physical and mechanical properties of fibers and yarns.

[0004] Currently, the toughness of polyester-cotton blended yarn is not very good, which is affected by many factors. The yarn itself and the moisture regain during the steaming process are important factors. Therefore, how to improve the toughness of polyester-cotton blended yarn is an urgent problem to be solved. Summary of the Invention

[0005] To improve the toughness of polyester-cotton blended yarn, this application provides a steaming process for high-toughness polyester-cotton blended yarn.

[0006] In the first aspect, this application provides a steaming process for high-tenacity polyester-cotton blended yarn, employing the following technical solution:

[0007] A steaming process for high-tenacity polyester-cotton blended yarn includes the following steps:

[0008] S1: Soak the polyester-cotton blended yarn to obtain the treated polyester-cotton blended yarn.

[0009] S2: Put the treated polyester-cotton blended yarn into a steaming machine. Under vacuum conditions, set the pressure to -40-(-60) kPa and enter the first heating cycle. Set the temperature to 55-65℃. First, use steam to heat to 95% of the set temperature. Then, stop steam heating and use electric heating to heat to the set temperature. Keep warm for 8-12 minutes. The first heating cycle is complete.

[0010] S3: After the heat preservation stage is completed, the second heating cycle begins. Under vacuum conditions, the pressure is set to -50-(-60) kPa. The second heating cycle begins with a set temperature of 70-90℃. Steam heating is used to reach 90% of the set temperature. Steam heating is then stopped, and electric heating is used to reach the set temperature. The temperature is maintained for 8-12 minutes. The second heating cycle is then completed. The temperature is then cooled down to complete the yarn steaming.

[0011] By adopting the above technical solution, the production process of steaming high-toughness polyester-cotton blended yarn of this application can reduce the CV value of single yarn evenness through the synergistic effect between various raw materials, avoid water droplet spots, and improve yarn strength and single yarn breaking strength, thereby improving the toughness of blended yarn. Specifically, the yarn strength is 521-545 CV, the single yarn breaking strength is 28.44-30.56 cN / tex, the evenness CV value is 15.2-15.3%, and there are no water droplet spots.

[0012] First, the polyester-cotton blended yarn is soaked to improve its toughness through surface treatment. Then, the yarn is steamed using a dual-cycle heating method, achieving an effect equivalent to two steamings in a short time. This improves the steaming process, shortens the steaming time, and reduces costs. Furthermore, the use of both steam and electric heating effectively controls temperature and moisture regain. Excessive moisture regain hinders opening and impurity removal, affecting subsequent processing; insufficient moisture regain increases brittleness, reducing toughness and elasticity, thus impacting quality. Maintaining the moisture regain within a certain range is beneficial for improving the yarn's toughness. Both heating cycles begin with steam heating to a certain temperature. Because steam heating is a coarse heating method that can generate excessive heat and cause significant temperature fluctuations, a more precise electric heating method is used near the set temperature to better control the moisture regain, thereby improving the yarn's toughness.

[0013] As a preferred option, the specific steps of the soaking treatment in step S1 are as follows: immerse the polyester-cotton blended yarn in the soaking solution for 10-14 hours, take it out, dry it, and obtain the treated polyester-cotton blended yarn.

[0014] Furthermore, the specific steps of the soaking treatment in step S1 are as follows: immerse the polyester-cotton blended yarn in the soaking solution for 10-14 hours, take it out, dry it, and obtain the treated polyester-cotton blended yarn.

[0015] The amount of soaking solution added to each 1g of polyester-cotton blended yarn is 4-6mL.

[0016] By adopting the above technical solution, the polyester-cotton blended yarn is soaked before steaming, which allows the soaking solution to fully impregnate the polyester-cotton blended yarn, enabling each raw material to play a better role and thus helping to improve the toughness of the blended yarn.

[0017] Preferably, the soaking solution comprises the following raw materials in parts by weight: 5-8 parts of composite material, 3-6 parts of zinc oxide, 4-9 parts of wax emulsion, 1-3 parts of silane coupling agent, and 35-50 parts of water; the composite material is made of sepiolite powder supported on nano-silica.

[0018] By adopting the above technical solution, the composite material is made of sepiolite powder loaded with nano-silica. Firstly, sepiolite powder possesses superior toughness. Its structure contains channels and voids, resulting in a large specific surface area and pore volume, thus exhibiting excellent adsorption properties. Secondly, nano-silica, as a nanoparticle, utilizes volume and quantum tunneling effects to achieve penetration. Its large specific surface energy facilitates self-aggregation. Loaded onto sepiolite powder, it can better penetrate into the polyester-cotton blended yarn, overlapping with the electron cloud to form a spatial network structure. This significantly improves the toughness of the polyester-cotton blended yarn, and nano-silica exhibits better toughness than other inorganic fillers. The synergistic effect between sepiolite powder and nano-silica further enhances the toughness of the polyester-cotton blended yarn.

[0019] Zinc oxide also possesses superior toughness; its application in the raw materials of soaking solutions can improve the toughness of blended yarns. Wax emulsions, as fiber protectants, can penetrate into the interior of polyester-cotton blended yarns, filling the fiber gaps and coating them with a protective film, thus further enhancing the toughness of the blended yarns. Silane coupling agents can improve the dispersibility of zinc oxide and other agents, facilitating their better performance and further improving the toughness of blended yarns.

[0020] Preferably, the composite material is prepared using the following method:

[0021] A1: Crush and sieve the sepiolite, add it to hydrochloric acid solution, mix evenly, let stand, filter, wash, and dry to obtain pretreated sepiolite powder.

[0022] A2: The pretreated sepiolite powder is placed in water, nano-silica is added, ultrasonically dispersed, filtered, and dried to obtain the composite material.

[0023] Furthermore, the composite material is prepared using the following method:

[0024] A1: Crush sepiolite, pass it through a 100-mesh sieve, add it to hydrochloric acid solution, mix well, let it stand for 1-2 hours, filter, wash with sodium hydroxide solution, and dry to obtain pretreated sepiolite powder.

[0025] A2: Place the pretreated sepiolite powder in water, add nano-silica, ultrasonically disperse for 30-40 minutes, filter, and dry to obtain the composite material;

[0026] The hydrochloric acid solution has a mass fraction of 30%, the sodium hydroxide solution has a mass fraction of 30%, the amount of hydrochloric acid solution added per 1g of sepiolite powder is 3-5mL, and the amount of water added per 1g of sepiolite powder is 5-6mL.

[0027] By adopting the above technical solution and using the above preparation method to prepare composite materials, firstly, the sepiolite powder is treated with hydrochloric acid solution, which can remove impurities on the sepiolite, improve the adsorption of the sepiolite powder, and make it have better loading capacity, thereby facilitating the improvement of the toughness of the blended yarn.

[0028] Preferably, the weight ratio of sepiolite powder to nano-silica is 1:(0.4-0.6).

[0029] Adding too little nano-silica will not effectively improve the toughness of the blended yarn; adding too much nano-silica, due to its high surface energy, will cause agglomeration, which also fails to effectively improve the toughness of the blended yarn. By adopting the above technical solution, when the amount of nano-silica added is within the above range, the toughness of the blended yarn can be improved more effectively.

[0030] As a preferred option, the polyester-cotton blended yarn in step S1 is pretreated with plasma before being soaked.

[0031] Preferably, the plasma is one or more of Ar and N2.

[0032] By adopting the above technical solution, plasma is used to pretreat polyester-cotton blended yarn. Ar and N2 are inert gases that do not participate in any reaction on the fiber surface, but they can transfer energy to the macromolecules on the fiber surface and activate these molecules to generate free radicals, thereby enhancing the compatibility between the blended yarn and the soaking solution and improving the toughness of the blended yarn.

[0033] Preferably, the heating rate of both the first heating cycle and the second heating cycle is 1-3℃ / min.

[0034] Preferably, the cooling process employs pressure cooling, and the cooling rate during the cooling process is 2-4℃ / min.

[0035] By adopting the above technical solution, the heating rate and cooling rate of the first heating cycle and the second heating cycle are limited, so that they are heated and cooled evenly, which facilitates uniform heating of the blended yarn. The pressure cooling method also avoids water droplet spots and contamination of the blended yarn.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. Because this application adopts a dual-cycle heating mode of heating-insulation-heating-insulation-cooling, it is easy for the blended yarn to be heated evenly. At the same time, the use of steam heating and electric heating can effectively control the moisture regain, thereby better improving the toughness of the blended yarn. It can make the yarn strength reach 545CV, the single yarn breaking strength reach 30.56cN / tex, the yarn evenness CV value reduced to 15.2%, and there are no water droplet spots.

[0038] 2. In this application, sepiolite powder loaded with nano-silica is preferably used as a composite material in the soaking solution. Through the synergistic effect between sepiolite powder and nano-silica, the toughness of the blended yarn can be further improved. Detailed Implementation

[0039] The following provides a more detailed description of this application in conjunction with specific details.

[0040] raw material

[0041] All raw materials used in this application are commercially available.

[0042] The silane coupling agent is KH550.

[0043] Preparation Example

[0044] Preparation Example 1

[0045] A composite material prepared by the following method:

[0046] A1: Crush 2 kg of sepiolite powder, pass it through a 100-mesh sieve, add it to 8 L of 30% hydrochloric acid solution, mix well, let stand for 1.5 h, filter, wash 3-5 times with 30% sodium hydroxide solution, and dry to obtain pretreated sepiolite powder.

[0047] A2: Place the pretreated sepiolite powder into 11L of water, add 0.8kg of nano-silica, ultrasonically disperse for 35min, filter, and dry to obtain the composite material.

[0048] Preparation Example 2

[0049] A composite material differs from Preparation Example 1 in that the amount of nano-silica added is different; in Preparation Example 2, the amount of nano-silica added is 1 kg.

[0050] Preparation Example 3

[0051] A composite material differs from Preparation Example 1 in that the amount of nano-silica added is different; in Preparation Example 3, the amount of nano-silica added is 1.2 kg.

[0052] Preparation Examples 4-8

[0053] An immersion solution is prepared by mixing the following raw materials, and the proportions of the raw materials are shown in Table 1. The composite material is prepared using Preparation Example 1.

[0054] Table 1. Dosage of each raw material in the soaking solution of Examples 4-8 (unit: kg)

[0055]

[0056]

[0057] Preparation Example 9

[0058] An immersion solution differs from Preparation Example 7 in that the source of the composite material is different; the immersion solution in Preparation Example 9 was prepared using Preparation Example 2.

[0059] Preparation Example 10

[0060] An immersion solution differs from Preparation Example 7 in that the source of the composite material is different; the immersion solution in Preparation Example 10 was prepared using Preparation Example 3.

[0061] Example

[0062] Example 1

[0063] A steaming process for high-tenacity polyester-cotton blended yarn includes the following steps:

[0064] S1: The polyester-cotton blended yarn was placed in the soaking solution prepared in Preparation Example 4, soaked for 12 hours, taken out, and dried to obtain the treated polyester-cotton blended yarn; wherein, the amount of soaking solution added to each 1g of polyester-cotton blended yarn was 5mL.

[0065] S2: Place the treated polyester-cotton blended yarn into a steaming machine. Under vacuum conditions, set the pressure to -50kPa and enter the first heating cycle. Set the temperature to 60℃. First, use steam to heat to 95% of the set temperature. Then, stop steam heating and use electric heating to heat to the set temperature. Keep warm for 10 minutes. The first heating cycle is complete.

[0066] S3: After the heat preservation stage is completed, the second heating cycle begins. Under vacuum conditions, the pressure is set to -55kPa. The temperature is set to 80℃. First, steam heating is used to heat to 90% of the set temperature. Then, steam heating is stopped, and electric heating is used to heat to the set temperature. The temperature is maintained for 10 minutes. The second heating cycle is then completed. Finally, the temperature is reduced by vacuuming and cooling to complete the yarn steaming process.

[0067] The heating rate during the first and second heating cycles is 2℃ / min, and the cooling rate during the cooling process is 3℃ / min.

[0068] Examples 2-7

[0069] A steaming process for high-toughness polyester-cotton blended yarn differs from Example 1 in that the source of the soaking solution is different. The soaking solutions in Examples 2-7 were prepared using Preparation Examples 5-10, respectively.

[0070] Comparative Example

[0071] Comparative Example 1

[0072] A steaming process for high-toughness polyester-cotton blended yarn differs from Example 1 in that the polyester-cotton blended yarn is not soaked in a soaking solution.

[0073] Comparative Example 2

[0074] A steaming process for high-toughness polyester-cotton blended yarn differs from Example 1 in that the composite material in the soaking solution is replaced in equal amounts with sepiolite powder.

[0075] Comparative Example 3

[0076] A steaming process for high-toughness polyester-cotton blended yarn differs from Example 1 in that the composite material in the soaking solution is replaced in equal amounts with nano-silica.

[0077] Comparative Example 4

[0078] A steaming process for high-toughness polyester-cotton blended yarn differs from Example 1 in that only steam heating is used in both the first and second heating cycles.

[0079] Comparative Example 5

[0080] A steaming process for high-toughness polyester-cotton blended yarn differs from Example 1 in that both the first and second heating cycles use only electric heating.

[0081] Performance testing

[0082] The following performance tests were conducted on the polyester-cotton blended yarns from Examples 1-7 and Comparative Examples 1-5:

[0083] Yarn strength: The yarn strength of polyester-cotton blended yarn was measured according to FZ / T71002-2015 "Combed wool knitting yarn". The test results are shown in Table 2.

[0084] Single yarn breaking strength: The single yarn breaking strength of polyester-cotton blended yarn was determined according to FZ / T71002-2015 "Combed wool knitting yarn". The test results are shown in Table 2.

[0085] Evenness CV value: The evenness CV value of polyester-cotton blended yarn was determined according to GB / T3292.0-2008 "Textile yarn unevenness test method - Part 1: Capacitance method". The test results are shown in Table 2.

[0086] Presence or absence of water droplets: After the yarn is steamed, observe whether there are water droplets on the polyester-cotton blended yarn. The test results are shown in Table 2.

[0087] Table 2 Detection Results

[0088]

[0089]

[0090] As can be seen from Table 2, the production process of the high-toughness polyester-cotton blended yarn steaming of this application can reduce the CV value of single yarn evenness through the synergistic effect between various raw materials, avoid water droplet spots, and improve yarn strength and single yarn breaking strength, as well as improve the toughness of the blended yarn. Specifically, the yarn strength is 521-545 CV, the single yarn breaking strength is 28.44-30.56 cN / tex, the evenness CV value is 15.2-15.3%, and there are no water droplet spots.

[0091] Combining Example 1 and Comparative Examples 1-3, it can be seen that the blended yarn in Example 1 has a yarn strength of 521 CV, a single yarn breaking strength of 28.44 cN / tex, a yarn evenness CV value of 15.3%, and no water droplet spots, which is better than that of Comparative Examples 1-3. This indicates that it is more suitable to use sepiolite powder and nano-silica as a composite material in the raw materials of the soaking solution, which improves the yarn strength and single yarn breaking strength, improves the toughness of the blended yarn, reduces the single yarn evenness CV value, and avoids water droplet spots.

[0092] Combining Example 1 and Comparative Examples 4-5, it can be seen that the blended yarn in Example 1 has a yarn strength of 521 CV, a single yarn breaking strength of 28.44 cN / tex, a yarn evenness CV value of 15.3%, and no water droplet spots, which is better than that in Comparative Examples 4-5. This indicates that the heating method using a dual-cycle approach of steam heating and electric heating is more suitable, which improves the yarn strength and single yarn breaking strength, enhances the toughness of the blended yarn, reduces the single yarn evenness CV value, and avoids the appearance of water droplet spots.

[0093] As can be seen from Examples 1-5, the blended yarn in Example 4 has a yarn strength of 536 CV, a single yarn breaking strength of 29.41 cN / tex, a yarn evenness CV value of 15.3%, and no water droplet spots, which is better than other examples. This indicates that the composite material prepared by Example 7 is more suitable, as it can reduce the single yarn evenness CV value, avoid water droplet spots, and also improve the yarn strength and single yarn breaking strength, thus improving the toughness of the blended yarn.

[0094] As can be seen from Examples 4 and 6-7, the blended yarn in Example 6 has a yarn strength of 545 CV, a single yarn breaking strength of 30.56 cN / tex, a yarn evenness CV value of 15.2%, and no water droplet spots. This indicates that the composite material prepared by Example 9 is more suitable, as it can reduce the single yarn evenness CV value, avoid water droplet spots, and also improve the yarn strength and single yarn breaking strength, thus improving the toughness of the blended yarn.

[0095] The embodiments described above are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A steaming process for high-tenacity polyester-cotton blended yarn, characterized in that: Includes the following steps: S1: Soak the polyester-cotton blended yarn to obtain the treated polyester-cotton blended yarn; S2: Put the treated polyester-cotton blended yarn into a steaming machine. Under vacuum conditions, set the pressure to -40-(-60) kPa and enter the first heating cycle. Set the temperature to 55-65℃. First, use steam to heat to 95% of the set temperature. Then, stop steam heating and use electric heating to heat to the set temperature. Keep warm for 8-12 minutes. The first heating cycle is complete. S3: After the heat preservation stage is over, the second heating cycle begins. Under vacuum conditions, the pressure is set to -50-(-60) kPa. The second heating cycle begins with a set temperature of 70-90℃. Steam is used to heat the yarn to 90% of the set temperature. Steam heating is then stopped, and electric heating is used to heat the yarn to the set temperature. The temperature is maintained for 8-12 minutes. The second heating cycle is then completed. The yarn is then cooled down to complete the steaming process. The specific steps of the soaking treatment in step S1 are as follows: immerse the polyester-cotton blended yarn in the soaking solution for 10-14 hours, remove it, and dry it to obtain the treated polyester-cotton blended yarn; the soaking solution includes the following raw materials in parts by weight: 5-8 parts of composite material, 3-6 parts of zinc oxide, 4-9 parts of wax emulsion, 1-3 parts of silane coupling agent, and 35-50 parts of water; the composite material is made of sepiolite powder supported on nano-silica; The composite material is prepared using the following method: A1: Crush and sieve the sepiolite, add it to hydrochloric acid solution, mix evenly, let stand, filter, wash, and dry to obtain pretreated sepiolite powder. A2: The pretreated sepiolite powder is placed in water, nano-silica is added, ultrasonically dispersed, filtered, and dried to obtain the composite material.

2. The steaming process for a high-toughness polyester-cotton blended yarn according to claim 1, characterized in that: The weight ratio of sepiolite powder and nano-silica is 1:(0.4-0.6).

3. The steaming process for a high-toughness polyester-cotton blended yarn according to claim 1, characterized in that: Before the immersion treatment, the polyester-cotton blended yarn in step S1 is pretreated with plasma atmosphere.

4. The steaming process for a high-toughness polyester-cotton blended yarn according to claim 3, characterized in that: The plasma atmosphere is one or more of Ar and N2.

5. The steaming process for a high-toughness polyester-cotton blended yarn according to claim 1, characterized in that: The heating rate for both the first and second heating cycles is 1-3℃ / min.

6. The steaming process for a high-toughness polyester-cotton blended yarn according to claim 1, characterized in that: The cooling process employs pressure cooling, and the cooling rate during the cooling process is 2-4℃ / min.

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