Preparation process and product of water-soluble filament knitted fabric

Abstract

This application relates to the field of textile fabric processing, and discloses a preparation process and product of water-soluble silk knitted fabric. The preparation process of a water-soluble silk knitted fabric includes the following steps: S1, knitting blended yarn and water-soluble silk rib knit to obtain a greige fabric; S2, treating the greige fabric with an enzyme etching agent to obtain a pretreated greige fabric; S3, soaking the pretreated greige fabric in hot water, heat-setting, and post-treatment to obtain the knitted fabric; the blended yarn is made from cotton fiber and low-temperature hot-melt yarn, and the low-temperature hot-melt yarn is made from the following raw materials in parts by weight: 32-42 parts diisocyanate, 15-25 parts polyether diol, 5-10 parts bio-based polyol, 10-16 parts elastic stabilizer, 6-10 parts chain extender, 0.1-0.3 parts catalyst, and 0.1-0.3 parts antioxidant. The water-soluble silk knitted fabric obtained by this application is not easily shrunk or deformed during long-term washing and wearing, and can maintain good elastic recovery performance.

Description

Technical Field

[0001] This application relates to the field of textile fabric processing, and in particular to a preparation process and product of water-soluble yarn knitted fabric. Background Technology

[0002] Water-soluble yarn knitted fabric is a type of fabric in which water-soluble polyvinyl alcohol (PVA) filaments are introduced during the knitting process. In the finishing process, hot water is used to dissolve the water-soluble PVA filaments in the fabric, creating a porous structure with openwork or three-dimensional patterns on the fabric surface. This porous structure increases the fabric's bulkiness, helps reduce its weight, and improves its moisture-wicking and softness properties. It is widely used in sportswear, yoga wear, sleepwear, and infant and children's underwear, where moisture-wicking and comfort are important.

[0003] In existing technologies, the preparation of water-soluble yarn knitted fabrics typically involves using nylon, polyester, viscose, or cotton yarn as the main yarn, knitting it with water-soluble yarn at a predetermined loop ratio to form a greige fabric with rib, tuck, transfer, or jacquard weave structures. After desizing, the water-soluble yarn is dissolved in hot water, and then the finished fabric is obtained through low-temperature setting and softening finishing. The advantages of this process are: the fabric is significantly lighter after the water-soluble yarn is dissolved, the gaps between the yarns are enlarged, and the static air content is increased, thereby significantly improving the bulk, moisture permeability, and softness of the hand without increasing the weight. Furthermore, rich openwork patterns can be obtained through weave design.

[0004] However, after the water-soluble yarn dissolves, the binding force between the yarns is significantly reduced, and the stability of the loop structure decreases. This makes the fabric prone to longitudinal shrinkage, lateral expansion, or overall deformation during subsequent multiple washes or long-term wear. At the same time, the increased yarn spacing weakens the fabric's dimensional recovery, reduces the elastic recovery rate, and significantly affects the smoothness and durability of the appearance, thus limiting the application of water-soluble yarn knitted fabrics in high-frequency washing and long-term wear scenarios. Summary of the Invention

[0005] To address the issues of shrinkage, deformation, and reduced elasticity in existing water-soluble yarn knitted fabrics under high-frequency washing and long-term wear, this application provides a manufacturing process and product for water-soluble yarn knitted fabrics.

[0006] In a first aspect, this application provides a process for preparing water-soluble yarn knitted fabric, which adopts the following technical solution: A process for preparing a water-soluble silk knitted fabric includes the following steps: S1. The blended yarn and water-soluble yarn are knitted in rib pattern to obtain the greige fabric; S2. Use an enzyme etching agent to etch the fabric to obtain a pretreated fabric. S3. The pre-treated fabric is soaked in hot water, heat-set, and post-treated to obtain the knitted fabric. The blended yarn is made from cotton fiber and low-temperature hot melt yarn, which is made from the following raw materials in parts by weight: 32-42 parts diisocyanate, 15-25 parts polyether diol, 5-10 parts bio-based polyol, 10-16 parts elastic stabilizer, 6-10 parts chain extender, 0.1-0.3 parts catalyst, and 0.1-0.3 parts antioxidant.

[0007] By adopting the above technical solution, in step S1, the blended yarn and water-soluble yarn are knitted in rib to obtain a greige fabric. The rib knit structure gives the greige fabric good elasticity and structural stability. In step S2, an enzyme etching agent is used to etch the greige fabric to obtain a pre-treated greige fabric, which can remove the fuzz on the surface of the greige fabric and form a microporous structure on the surface of the blended yarn, which facilitates the subsequent shaping of the fabric and improves the shaping stability of the fabric, making the fabric less prone to shrinkage or deformation. In step S3, the pre-treated greige fabric is soaked in hot water, which can dissolve the water-soluble yarn and form hollow areas on the surface of the fabric, improving the fluffiness of the fabric, helping to reduce the fabric weight, and improving moisture absorption and perspiration and softness. Heat setting can fix the shape and size of the fabric, further improving the shrinkage and deformation problems of the fabric. The post-treatment further improves the overall performance of the fabric. The blended yarn is made from cotton fibers and low-temperature heat-melting yarn. The cotton fibers give the fabric good moisture absorption and comfort, while the low-temperature heat-melting yarn, made from specific weight parts of diisocyanate, polyether diol, bio-based polyol, elastic stabilizer, chain extender, catalyst, and antioxidant, imparts good elasticity and low-temperature heat-setting properties to the fabric. The resulting water-soluble yarn knitted fabric is not easily shrunk or deformed during long-term washing and wearing, and maintains good elastic recovery properties.

[0008] Preferably, the elastic stabilizer is prepared from the following raw materials in parts by weight: 30-40 parts of isocyanate-modified polyolefin 18-28 parts of trimethylallyl isocyanate 9-16 parts of allyl ethers.

[0009] By employing the above technical solution, isocyanate-modified polyolefin, trimethylallyl isocyanate, and allyl ethers are combined in specific weight proportions to form an elastic stabilizer. The three components work synergistically to improve the elastic stability of low-temperature hot-melt yarns. Specifically, isocyanate-modified polyolefin imparts a certain degree of flexibility and elasticity to the low-temperature hot-melt yarn, trimethylallyl isocyanate enhances intermolecular cross-linking, and allyl ethers help regulate the molecular structure, improving the dispersion uniformity and cross-linking stability of isocyanate-modified polyolefin and trimethylallyl isocyanate, further optimizing the elastic properties of the low-temperature hot-melt yarn. Applying this elastic stabilizer to the preparation of water-soluble yarn knitted fabrics enables the resulting fabric to effectively resist shrinkage and deformation during long-term washing and wear, maintaining good elastic recovery performance.

[0010] Preferably, the allyl ether is composed of allyl alcohol polyoxyalkyl ether and polyethylene glycol monoallyl ether in a weight ratio of 1:(2-4).

[0011] By adopting the above technical solution, allyl alcohol polyoxyalkyl ether and polyethylene glycol monoallyl ether are used as allyl ether substances in elastic stabilizers. The two substances work synergistically to improve the dispersion uniformity of the system, thereby improving the crosslinking stability of each raw material and making the obtained low-temperature hot melt wire have better elastic stability.

[0012] Preferably, the elastic stabilizer is prepared by the following steps: adding isocyanate-modified polyolefin, trimethylallyl isocyanate and allyl ether to a stirring device, heating and stirring until uniform, to obtain the elastic stabilizer.

[0013] By adopting the above technical solution, isocyanate-modified polyolefin, trimethylallyl isocyanate and allyl ether substances are fully and uniformly dispersed in the low-temperature hot melt adhesive system, and further react fully with diisocyanate, polyether diol, bio-based polyol and chain extender to improve the overall performance of the prepared low-temperature hot melt wire.

[0014] Preferably, the polyether diol is polytetramethylene ether diol and / or polypropylene oxide ether diol, and the bio-based diol is castor oil polyol and / or cashew nut shell oil polyol.

[0015] By adopting the above technical solution, polytetramethylene ether glycol and / or polypropylene oxide ether glycol are used as polyether diols, and castor oil polyol and / or cashew nut shell oil polyol are used as bio-based polyols in low-temperature hot melt yarn. Polyether diols have good flexibility and elasticity, which can give low-temperature hot melt yarn better low-temperature hot melt performance and elasticity. Bio-based polyols are renewable and environmentally friendly, and their molecular structure helps to improve the stability and durability of low-temperature hot melt yarn, thereby improving the shrinkage resistance, deformation resistance and elastic recovery performance of water-soluble yarn knitted fabrics during long-term washing and wearing.

[0016] Preferably, the weight ratio of the cotton fiber and the low-temperature hot melt wire is (92-95):(5-8).

[0017] By adopting the above technical solution, the excellent moisture absorption, breathability, and softness of cotton fibers can be utilized, while the heat-melting properties of low-temperature hot-melt yarn can be used to form a certain connection and fixation between yarns during the heat setting process. This enhances the dimensional stability and elastic recovery performance of the fabric, making the resulting water-soluble yarn knitted fabric less prone to shrinkage and deformation during long-term washing and wearing. However, if the proportion of low-temperature hot-melt yarn is too high, the fabric will feel stiff and its softness will be affected.

[0018] Preferably, the enzymatic etchant in step S2 is prepared from 0.5-1.5 wt% alkaline hydroxide, 1-3 wt% cellulase, 1-2 wt% glycerol and the balance water.

[0019] By adopting the above technical solution and optimizing the formulation of the enzyme etching agent, the greige fabric is enzymatically treated, which can form a uniform microporous structure in the blended yarn fabric and further improve the stability of subsequent heat setting.

[0020] Preferably, the etching temperature in step S2 is 40-50℃ and the etching time is 30-50 min.

[0021] By adopting the above technical solution, while effectively removing the fuzz from the surface of the greige fabric, a uniform microporous structure can be formed on the surface of the blended yarns of the greige fabric, avoiding excessive damage to the greige fabric and ensuring the quality and performance of the greige fabric.

[0022] Preferably, the hot water immersion temperature in step S3 is 80-90℃, the heat setting temperature is 110-120℃, and the heat setting time is 10-20s.

[0023] By adopting the above technical solutions, a hot water soaking temperature of 80-90℃ can effectively dissolve water-soluble yarns, allowing the fabric to form the required hollow areas and improving the fabric's fluffiness, moisture absorption and perspiration wicking, and softness; a heat setting temperature of 110-120℃ and a heat setting time of 10-20s can enable the low-temperature hot melt yarns in the blended yarns to play a better role and enhance the structural stability of the fabric.

[0024] Secondly, this application provides a water-soluble yarn knitted fabric, which adopts the following technical solution: A water-soluble yarn knitted fabric is prepared by the above-mentioned process.

[0025] By adopting the above technical solution, the resulting water-soluble silk knitted fabric is not easy to shrink or deform during long-term washing and wearing, and can maintain good elastic recovery performance. At the same time, the fabric surface forms a hollow or three-dimensional patterned gap structure, which improves fluffiness, reduces weight, and enhances moisture absorption, perspiration wicking and softness.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The preparation process of this application involves knitting a blended yarn made from cotton fiber and water-soluble yarn into a rib knit fabric, then treating it with an enzyme etching agent, followed by hot water soaking, heat setting, and post-treatment. The low-temperature hot melt yarn is made from diisocyanate, polyether diol, bio-based polyol, elastic stabilizer, chain extender, catalyst, and antioxidant. The resulting water-soluble yarn knitted fabric is not easily shrunk or deformed during long-term washing and wearing, and can maintain good elastic recovery performance, making it suitable for sportswear, pajamas, infant clothing, and other garments.

[0027] 2. The elastic stabilizer is made from isocyanate-modified polyolefin, trimethylallyl isocyanate and allyl ethers, which helps the knitted fabric maintain good elastic recovery properties.

[0028] 3. Allyl ethers are composed of allyl alcohol polyoxyalkyl ethers and polyethylene glycol monoallyl ethers, which can improve the performance of elastic stabilizers and further help knitted fabrics maintain their elastic recovery properties. Attached Figure Description

[0029] Figure 1 This is a photograph of the water-soluble silk knitted fabric of Embodiment 1 of this application; Figure 2 This is a photograph of a knitted fabric with a wavy openwork pattern as described in Embodiment 1 of this application. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 The present application will be further described in detail with reference to the embodiments.

[0031] The following are some of the sources and specifications of the raw materials used in this application. The raw materials used in the preparation examples and embodiments of this application can all be obtained commercially, including but not limited to the following models and manufacturers of raw materials. Raw materials with equivalent performance can also be used: 1. Isocyanate-modified polyolefin: Chongqing Hycomma, H104; 2. Allyl alcohol polyoxyalkyl ether: Haishihua F-6, content 99%; 3. Polyethylene glycol monoallyl ether: CAS No. 27274-31-3, content 99%; 4. Polytetramethylene ether glycol: molecular weight 2000-3000; 5. Polyoxypropylene ether glycol: DL4000D from UGREEN Chemicals; 7. Castor oil polyols: Vantrus Polycin M-280; 8. Cashew nut shell oil polyols: Haoyi New Materials, FX-9008; 9. Cellulase: Mingtong Biotechnology, enzyme activity 50,000 u / g.

[0032] Example of preparation of elastic stabilizer Preparation Example 1 Preparation Example 1 discloses an elastic stabilizer, which is prepared by the following steps: 3 kg of isocyanate-modified polyolefin, 1.8 kg of trimethylallyl isocyanate and 0.9 kg of allyl ether are added to a stirring device, heated to 80°C, stirred for 60 min, and stirred until uniform to obtain the elastic stabilizer.

[0033] Preparation Examples 2-3 The difference between Preparation Example 2-3 and Preparation Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 1 below.

[0034] Table 1. Parameters for Preparation Examples 1-3

[0035] Preparation Example 4 The difference between Preparation Example 4 and Preparation Example 1 is that the allyl ether is composed of allyl alcohol polyoxyalkyl ether and polyethylene glycol monoallyl ether in a ratio of 1:2. Otherwise, it is the same as Preparation Example 1.

[0036] Preparation Example 5 The difference between Preparation Example 5 and Preparation Example 1 is that the allyl ether is composed of allyl alcohol polyoxyalkyl ether and polyethylene glycol monoallyl ether in a weight ratio of 1:4, while the rest is the same as Preparation Example 1.

[0037] Preparation Example 6 The difference between Preparation Example 6 and Preparation Example 1 is that the isocyanate-modified polyolefin is replaced with an equal amount of dicyclohexylmethane diisocyanate, while the rest is the same as Preparation Example 1.

[0038] Preparation Example 7 The difference between Preparation Example 7 and Preparation Example 1 is that trimethallyl isocyanate was replaced in equal amounts with isocyanate-modified polyolefin, while the rest is the same as Preparation Example 1.

[0039] Preparation Example 8 The difference between Preparation Example 8 and Preparation Example 1 is that allyl ethers are replaced with polyethylene glycol 800 in equal amounts, otherwise the same as Preparation Example 1. Example Example 1

[0040] Example 1 discloses a preparation process for water-soluble silk knitted fabric, including the following steps: S1. Double-sided 2*1 rib knitting is performed on blended yarn with specification 50D and PVA water-soluble yarn with specification 50D. Water-soluble yarn is knitted every 20 horizontal rows on the front side to obtain the greige fabric. S2. Use an enzyme etching agent to perform etching treatment on the fabric, control the etching treatment temperature at 40℃ and the etching time at 50min, and obtain the pretreated fabric. S3. The pre-treated fabric is soaked in hot water at a temperature of 80℃ for 30 minutes, followed by heat setting at 110℃ for 20 seconds, and then napped to obtain the knitted fabric. (Refer to...) Figure 1 The resulting knitted fabric has a weight of 180 g / m². 2 .

[0041] In this embodiment, the wavy, openwork texture can also be formed on the knitted fabric by changing the weaving cross structure of the blended yarns and PVA water-soluble yarns in the 2*1 rib knit. See [link to documentation]. Figure 2 The preparation process will not be described in detail here. This embodiment mainly focuses on the process steps in the above preparation process for detailed explanation.

[0042] The blended yarn is made by blending 0.92 kg of cotton fiber and 0.08 kg of low-temperature hot melt yarn; The low-temperature hot melt wire is composed of 3.2 kg isoflurane diisocyanate, 1.5 kg polytetramethylene ether glycol, 0.5 kg bio-based polyol (composed of castor oil polyol and cashew nut shell oil polyol in a weight ratio of 2:1), 1 kg of elastic stabilizer prepared in the preparation example, 0.6 kg 1,4-butanediol as a chain extender, 0.01 kg dibutyltin dilaurate as a catalyst, and 0.01 kg antioxidant (composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1). The enzyme etching agent was prepared from 0.05 kg sodium hydroxide as an alkaline hydroxide, 0.3 kg cellulase, 0.1 kg glycerol and 9.55 kg water.

[0043] Example 2-3 The difference between Examples 1-3 and Example 1 lies in the different amounts of raw materials and preparation conditions, as detailed in Table 2 below.

[0044] Table 2 Parameter Table for Examples 1-3

[0045] Examples 4-8 The difference between Examples 4-8 and Example 1 is that the source of the elastic stabilizer in the low-temperature hot melt wire is different, as detailed in Table 3 below.

[0046] Table 3. Sources of elastic stabilizers for low-temperature hot melt wires in Examples 4-8 Comparative Example

[0047] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that no elastic stabilizer is added to the low-temperature hot melt wire; otherwise, they are the same as in Example 1.

[0048] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the etching process in step S2 is not performed, and the fabric is directly soaked in hot water. Otherwise, it is the same as Example 1. Performance testing

[0049] The following tests were conducted on the performance of the water-soluble yarn knitted fabrics prepared in Examples 1-8 and Comparative Examples 1-2: 1. Deformation rate test 1) Use a textile tensile testing machine to perform the test. Stretch along the vertical direction of the weave, control the elongation rate at 200%, hold the stretch for 20 minutes, and then allow it to recover for 2 minutes. Repeat this cycle 25 times. After a 10-minute recovery period, measure the length along the vertical direction of the weave and measure the deformation rate (unit: %). Deformation rate = (length after test - initial length) / initial length * 100%. 2) Use a washing machine to wash the water-soluble silk fabric with 1% commercially available laundry detergent, select the standard mode (15 minutes, water wash + spin dry), and cycle the wash 25 times. Dry the fabric and measure the length along the vertical direction of the weave. Measure the deformation rate (unit: %). Deformation rate = (length after test - initial length) / initial length * 100%. 2. Breathability test The air permeability (unit: mm / s) was tested according to the method in GB / T 5453-1997 "Determination of air permeability of textile fabrics". The air permeability of the weave cross section was tested and the test results were recorded. The following are the performance test data of the water-soluble silk knitted fabrics prepared in Examples 1-8 and Comparative Examples 1-2, as detailed in Table 4 below.

[0050] Table 4 Performance data of Examples 1-8 and Comparative Examples 1-2

[0051] Based on Examples 1-3 and 4-8, Comparative Example 1, and Table 4, it can be concluded that the low-temperature hot melt yarn prepared using the elastic stabilizer obtained from the specific components of this application produces knitted fabrics with good elastic recovery and breathability, and is not easily deformed. Examples 4-5, compared to Example 1, further optimized the types and proportions of allyl ether substances, resulting in a lower deformation rate and improved breathability of the knitted fabrics. Examples 6-8, by changing the types of components in the elastic stabilizer, resulted in an increased deformation rate and decreased breathability of the knitted fabrics. Comparative Example 1, compared to Example 1, did not add an elastic stabilizer to the low-temperature hot melt yarn, resulting in a significantly higher deformation rate and lower breathability of the knitted fabric after stretching and washing.

[0052] Based on Example 1 and Comparative Example 2, and referring to Table 4, it can be concluded that the knitted fabric prepared using the process of enzymatic treatment, followed by hot water soaking, and then heat setting according to this application exhibits excellent elastic recovery and breathability. In Comparative Example 1, no enzymatic treatment was performed before the hot water soaking process, resulting in an increased deformation rate and a significant decrease in breathability of the knitted fabric. This may be because the heat setting efficiency of the unenzymatically treated knitted fabric is reduced, leading to phenomena such as agglomeration of the blended yarns, thus decreasing the breathability of the knitted fabric.

[0053] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A preparation process for water-soluble silk knitted fabric, characterized in that, The preparation steps include the following: S1. The blended yarn and water-soluble yarn are knitted in rib pattern to obtain the greige fabric; S2. Use an enzyme etching agent to etch the fabric to obtain a pretreated fabric. S3. The pre-treated fabric is soaked in hot water, heat-set, and post-treated to obtain the knitted fabric. The blended yarn is made from cotton fiber and low-temperature hot melt yarn, which is made from the following raw materials in parts by weight: 32-42 parts diisocyanate, 15-25 parts polyether diol, 5-10 parts bio-based polyol, 10-16 parts elastic stabilizer, 6-10 parts chain extender, 0.1-0.3 parts catalyst, and 0.1-0.3 parts antioxidant.

2. The preparation process of a water-soluble yarn knitted fabric according to claim 1, characterized in that, The elastic stabilizer is prepared from the following raw materials in parts by weight: 30-40 parts of isocyanate-modified polyolefin 18-28 parts of trimethylallyl isocyanate 9-16 parts of allyl ethers.

3. The preparation process of a water-soluble yarn knitted fabric according to claim 2, characterized in that, The allyl ethers are composed of allyl alcohol polyoxyalkyl ethers and polyethylene glycol monoallyl ethers in a weight ratio of 1:(2-4).

4. The preparation process of a water-soluble yarn knitted fabric according to claim 2 or 3, characterized in that, The elastic stabilizer is prepared by the following steps: isocyanate-modified polyolefin, trimethylallyl isocyanate and allyl ether are added to a stirring device, heated and stirred evenly to obtain the elastic stabilizer.

5. The preparation process of a water-soluble yarn knitted fabric according to claim 1, characterized in that, The polyether diol is polytetramethylene ether diol and / or polypropylene oxide ether diol, and the bio-based diol is castor oil polyol and / or cashew nut shell oil polyol.

6. The preparation process of a water-soluble silk knitted fabric according to claim 1, characterized in that, The weight ratio of the cotton fiber and the low-temperature hot melt wire is (92-95):(5-8).

7. The preparation process of a water-soluble yarn knitted fabric according to claim 1, characterized in that, The enzymatic etching agent in step S2 is prepared from 0.5-1.5 wt% alkaline hydroxide, 1-3 wt% cellulase, 1-2 wt% glycerol and the balance water.

8. The preparation process of a water-soluble yarn knitted fabric according to claim 1, characterized in that, The etching temperature in step S2 is 40-50℃, and the etching time is 30-50 minutes.

9. The preparation process of a water-soluble silk knitted fabric according to claim 1, characterized in that, The hot water immersion temperature in step S3 is 80-90℃, the heat setting temperature is 110-120℃, and the heat setting time is 10-20s.

10. A water-soluble yarn knitted fabric, characterized in that, It is prepared by the preparation process described in any one of claims 1-9.

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