Sweat-traceless 3D plain knitted fabric and preparation method thereof

Abstract

The invention relates to the technical field of fabrics, and particularly discloses a sweat traceless 3D plain knitted fabric and a preparation method thereof. The fabric is a 3D plain knitted fabric with wrapping structure yarns as outer layer yarns, hydrophilic cotton yarns as middle yarns and waterproof yarns as inner layer yarns. The wrap yarn structure comprises core yarn and wrap yarn, the wrap yarn is spirally wound outside the core yarn and forms incomplete covering, the core yarn is waterproof cotton yarn, the wrap yarn is hydrophilic cotton yarn, and the number of the hydrophilic cotton yarn is higher than that of the waterproof cotton yarn; the thickness of the middle yarn is smaller than that of the outer layer yarn. According to the scheme, common hydrophobic polyester or common waterproof cotton yarn is replaced by hydrophilic / waterproof coated cotton yarn through ingenious design to serve as the surface layer, and the surface layer moisture volatilization rate is increased; the middle layer quickly absorbs water in the inner layer by using hydrophilic cotton; the inner layer is made of special-shaped section terylene, so that the water guiding capacity is improved, stuffiness and air tightness caused by swelling due to water absorption of fibers are avoided, and the wearing comfort of wet clothes is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fabrics, and specifically discloses a sweat-free 3D plain knitted fabric and a preparation method thereof. Background Art

[0002] It is easy for sweat to soak through clothes in summer, and the clothes fit the skin, causing discomfort and affecting the proper wearing. Therefore, some sweat-free fabrics are launched on the market to achieve the effect of absorbing sweat without showing sweat stains after wearing.

[0003] Currently, sweat-free products are mostly used on shirt woven fabrics. The hydrophilic agent is impregnated and the waterproof agent is applied to the other side with the help of the printing process, so that one side is hydrophilic and the other side is hydrophobic. The inner layer is hydrophilic and absorbs moisture, while the outer layer is hydrophobic to prevent sweat seepage and stains. The printing method can easily make the fabric feel hard and not breathable.

[0004] When sweat-free is applied to knitted fabrics, it is mainly a double-sided fabric made of a water-repellent outer layer and a hydrophilic inner layer connected by spandex, but the mainstream fabrics for daily wear are loose and comfortable; after the inner layer of this sweat-free fabric absorbs moisture, the fibers tend to swell, and even if part of the moisture is discharged through the capillary effect, the stuffy and airtight feeling still remains, and the moisture can only evaporate slowly through the tiny pores between the yarns, aggravating the discomfort; if the outer layer wants to quickly discharge moisture, high-thread-count polyester will be selected, which can easily cause snag problems in production and life, affecting the appearance.

[0005] In this regard, the present invention proposes a sweat-free fabric applied to knitted fabrics, which achieves the sweat-free effect while solving the problems of the existing sweat-free knitted fabrics such as being stuffy, airtight and easy to snag. Summary of the invention

[0006] The present invention aims to solve the problem of sweat stains caused by sweat absorption in existing fabrics, as well as the undesirable problems of stuffiness, airtightness and easy snagging in existing knitted fabrics, and proposes a sweat-free 3D plain knitted fabric and a preparation method thereof.

[0007] The sweat-free traceless fabric of the present invention is a hydrophobic / hydrophilic / hydrophobic 3D plain fabric; the inner layer of special-shaped polyester absorbs moisture into the fabric immediately after contacting moisture, and quickly diffuses it through the wicking effect. The special-shaped cross-section polyester is not easy to snag and pill, and the fabric surface effect is beautiful. The high density can prevent water vapor from penetrating back to the inner layer, and avoid moisture accumulation in the inner layer of the fabric and contact with the skin to cause discomfort; the middle is hydrophilic cotton yarn, and the high hydrophilicity can easily absorb the water of the inner layer and take away the moisture of the inner layer; the surface layer uses a coating structure pure cotton yarn with hydrophilic and hydrophobic treatment, the compactly spun cotton yarn has less hairiness and is not easy to drop fibers, the fine-count hydrophilic cotton yarn is on the outside, and the coarse-count hydrophobic cotton yarn is on the inside to form a coating structure pure cotton yarn, the high-count cotton yarn is relatively loosely wound, and soaking cannot be observed at a normal social distance. After weaving, it does not affect the hydrophobic performance of the surface layer, and its hydrophilic ability can quickly volatilize the moisture conducted by the inner layer and the middle yarn.

[0008] The specific technical solutions adopted are as follows:

[0009] In one aspect, the present invention discloses a method for preparing a sweat-free 3D plain knitted fabric, comprising the following steps:

[0010] S1, yarn spare

[0011] Preparation of outer yarn: taking cotton yarn, boiling and bleaching it, adding active dyes for dyeing, then adding hydrophilic additives for hydrophilic treatment or adding waterproof additives for waterproof treatment, and winding the dry yarn into bobbins to obtain hydrophilic cotton yarn and waterproof cotton yarn; coating the hydrophilic cotton yarn on the waterproof cotton yarn to obtain coated structure yarn, which is used as the outer yarn for standby use; the count of the hydrophilic cotton yarn is higher than the count of the waterproof cotton yarn;

[0012] Preparation of intermediate yarn: taking cotton yarn, scalding and bleaching it, adding reactive dyes for dyeing, then adding hydrophilic additives for hydrophilic treatment, winding the dry yarn into a bobbin to obtain hydrophilic cotton yarn as intermediate yarn for standby use, wherein the thickness of the intermediate yarn is finer than that of the outer yarn;

[0013] Preparation of inner layer yarn: taking waterproof synthetic fiber yarn, removing oil, adding disperse dyes for dyeing, winding the dry yarn into a bobbin to obtain waterproof yarn as the inner layer yarn for standby use;

[0014] S2. Fabric weaving

[0015] The position of the yarn guide is adjusted to control the output sequence of the outer yarn, the middle yarn and the inner yarn for weaving, and the yarns are washed in a vat and shaped to obtain a sweat-free 3D plain knitted fabric with the coated structure yarn on the outside, the hydrophilic cotton yarn in the middle and the waterproof yarn on the inside.

[0016] Preferably, the fabric has a grammage of 300±5g / m 2 .

[0017] Preferably, the inner layer yarn uses cross-section polyester yarn as the raw yarn.

[0018] Preferably, the twist number of the hydrophilic cotton yarn of the outer layer yarn wrapped around the waterproof cotton yarn is 200-500 twists / m, the count of the hydrophilic cotton yarn of the outer layer yarn is 80S, and the count of the waterproof cotton yarn of the outer layer yarn is 20S-50S.

[0019] Preferably, the count of the intermediate yarn is 40S-80S.

[0020] Preferably, the hydrophilic cotton yarn of the outer layer yarn is made of fine cotton compact spinning as the grey yarn, and the waterproof cotton yarn of the outer layer yarn is made of fine cotton siro compact spinning as the grey yarn; and the intermediate yarn is made of fine cotton compact spinning as the grey yarn.

[0021] Preferably, the hydrophilic additive dosage components in S1 include: 0.1-3% of hydrophilic agent and 0.1-1.5% of penetrant.

[0022] Preferably, the waterproofing auxiliary agent dosage components in S1 include: 1-20% waterproofing agent, 0.1-3% cross-linking agent, and 0.01-0.1% acetic acid.

[0023] Preferably, the hydrophilic treatment and waterproof treatment in S1 are performed by adding corresponding auxiliaries to the yarn dyeing machine and treating at 40-60° C. for 10-60 min.

[0024] On the other hand, the present invention discloses a sweat-free 3D plain knitted fabric.

[0025] The fabric is a 3D plain knitted fabric with a covering structure yarn as an outer layer yarn, a hydrophilic cotton yarn as an intermediate yarn, and a waterproof yarn as an inner layer yarn; the covering yarn structure includes a core yarn and a covering yarn, the covering yarn is spirally wound around the core yarn to form an incomplete coverage, the core yarn is a waterproof cotton yarn, the covering yarn is a hydrophilic cotton yarn, the count of the hydrophilic cotton yarn is higher than the count of the waterproof cotton yarn; the thickness of the intermediate yarn is finer than the thickness of the outer layer yarn.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] 1. Effectively avoid the shortcomings of poor air permeability and stuffiness caused by using printing for single parent and single defense;

[0028] 2. High-density 3D plain sweat-free knitted fabric is soft and has a wider range of applications. It is not limited to business wear, but can be used for sportswear and daily wear, effectively alleviating the embarrassment caused by sweat marks on clothes in daily life;

[0029] 3. The waterproof yarn of the inner layer can effectively prevent the back-seepage of water vapor; at the same time, the outer layer uses cotton yarn with a hydrophilic / waterproof coating structure, which not only increases the rate of water evaporation from the fabric, but also makes the surface cotton cloth feel better, more comfortable, more beautiful, and less prone to snags and pilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a diagram of the inner layer of the sweat-free 3D plain knitted fabric of Example 1 in the sweat-free test;

[0031] Figure 2 This is a diagram of the outer layer of the sweat-free 3D plain knitted fabric of Example 1 in the sweat-free test. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] A sweat-free 3D plain knitted fabric comprises the following steps:

[0035] S1, yarn spare

[0036] Preparation of outer yarn: 80S fine cotton compact spinning grey yarn is taken, after boiling and bleaching, reactive dye is added for dyeing, then 2% hydrophilic agent and 0.5% penetrant are added for treatment at 40°C for 30 minutes, and the dry yarn is wound at 100°C to obtain hydrophilic cotton yarn for standby use; 20S fine cotton siro compact spinning grey yarn is taken, after boiling and bleaching, reactive dye is added for dyeing, then 10% waterproofing agent, 2% cross-linking agent and 0.1% acetic acid are added for treatment at 40°C for 30 minutes, and the dry yarn is wound at 130°C to obtain waterproof cotton yarn for standby use; the hydrophilic cotton yarn is coated on the waterproof cotton yarn with 500 twists / m to obtain coated structure yarn as the outer yarn for standby use;

[0037] Preparation of intermediate yarn: 40S fine cotton compact spinning yarn is taken, simmered and bleached, then dyed with reactive dyes, then treated with 2% hydrophilic agent and 0.5% penetrant at 40°C for 30 minutes, and then dried at 100°C to obtain hydrophilic cotton yarn for use;

[0038] Preparation of inner layer yarn: 50D / 48F cross-section polyester yarn is taken, after degreasing, disperse dye is added for dyeing, and the dry yarn is wound into a bobbin to obtain waterproof yarn as the inner layer yarn for standby use;

[0039] S2. Fabric weaving

[0040] Adjust the position of the yarn guide to control the output sequence of the outer yarn, middle yarn and inner yarn, weave the 3D plain fabric through the large circular machine, wash it in the vat, and shape it to obtain the sweat-free 3D plain knitted fabric with the wrapped structure yarn on the outside, the hydrophilic cotton yarn in the middle and the waterproof yarn inside. The fabric weight is 300±5g / m 2 .

[0041] Weave structure: ︿︿︿︿︿︿

[0042] Example 2

[0043] A sweat-free 3D plain knitted fabric comprises the following steps:

[0044] S1, yarn spare

[0045] Preparation of outer yarn: 80S fine cotton compact spinning grey yarn is taken, after boiling and bleaching, reactive dye is added for dyeing, then 2% hydrophilic agent and 0.5% penetrant are added for treatment at 40°C for 30 minutes, and the dry yarn is wound at 100°C to obtain hydrophilic cotton yarn for standby use; 20S fine cotton siro compact spinning grey yarn is taken, after boiling and bleaching, reactive dye is added for dyeing, then 10% waterproofing agent, 2% cross-linking agent and 0.1% acetic acid are added for treatment at 40°C for 30 minutes, and the dry yarn is wound at 130°C to obtain waterproof cotton yarn for standby use; the hydrophilic cotton yarn is coated on the waterproof cotton yarn with 500 twists / m to obtain coated structure yarn as the outer yarn for standby use;

[0046] Preparation of intermediate yarn: 40S fine cotton compact spinning yarn is taken, simmered and bleached, then dyed with reactive dyes, then treated with 2% hydrophilic agent and 0.5% penetrant at 40°C for 30 minutes, and then dried at 100°C to obtain hydrophilic cotton yarn for use;

[0047] Preparation of inner layer yarn: 50D / 48F cross-section polyester yarn is taken, after degreasing, disperse dye is added for dyeing, and the dry yarn is wound into a bobbin to obtain waterproof yarn as the inner layer yarn for standby use;

[0048] S2. Fabric weaving

[0049] The position of the yarn guide is adjusted to control the output sequence of the outer yarn, the middle yarn, and the inner yarn. The weaving structure is consistent with that of Example 1. The 3D plain fabric is woven by a large circular machine, washed in a vat, and shaped to obtain a sweat-free 3D plain knitted fabric with a covered structure yarn on the outside, a hydrophilic cotton yarn in the middle, and a waterproof yarn inside. The fabric weight is 220±5g / m 2 .

[0050] The density and grammage of Example 2 are slightly lower than those of Example 1. Since the overall tightness of the fabric surface is not as good as that of Example 1, more moisture-absorbing coils are easily revealed on the surface due to movement during actual wear, resulting in sporadic water stains on the outer surface. In addition, the drying rate is also slightly lower than that of Example 1, indicating that the density and grammage of the 3D sweat-free plain knitted fabric of this scheme plays a key role in the sweat-free effect and the drying rate performance.

[0051] Example 3

[0052] A sweat-free 3D plain knitted fabric comprises the following steps:

[0053] S1, yarn spare

[0054] Preparation of outer yarn: taking 200S fine cotton compact spinning grey yarn, after boiling and bleaching, adding active dyes for dyeing treatment, then adding 2% hydrophilic agent and 0.5% penetrant for treatment at 40°C for 30min, and winding the dry yarn at 100°C to obtain hydrophilic cotton yarn for standby use; taking 20S fine cotton siro compact spinning grey yarn, after boiling and bleaching, adding active dyes for dyeing treatment, then adding 10% waterproofing agent, 2% cross-linking agent and 0.1% acetic acid for treatment at 40°C for 30min, and winding the dry yarn at 130°C to obtain waterproof cotton yarn for standby use; covering the hydrophilic cotton yarn with 500 twists / m on the waterproof cotton yarn to obtain a coated structure yarn as the outer yarn for standby use;

[0055] Preparation of intermediate yarn: 40S fine cotton compact spinning yarn is taken, simmered and bleached, then dyed with reactive dyes, then treated with 2% hydrophilic agent and 0.5% penetrant at 40°C for 30 minutes, and then dried at 100°C to obtain hydrophilic cotton yarn for use;

[0056] Preparation of inner layer yarn: 50D / 48F cross-section polyester yarn is taken, after degreasing, disperse dye is added for dyeing, and the dry yarn is wound into a bobbin to obtain waterproof yarn as the inner layer yarn for standby use;

[0057] S2. Fabric weaving

[0058] The position of the yarn guide is adjusted to control the output sequence of the outer yarn, the middle yarn, and the inner yarn. The weaving structure is consistent with that of Example 1. The 3D plain fabric is woven by a large circular machine, washed in a vat, and shaped to obtain a sweat-free 3D plain knitted fabric with a covered structure yarn on the outside, a hydrophilic cotton yarn in the middle, and a waterproof yarn inside. The fabric weight is 300±5g / m 2 .

[0059] Although the weaving structure of Example 3 is the same as that of Example 1 and the density in grams is also similar thereto, and the hydrophilic cotton yarn in the outer coating structure yarn is finer, although the sweat-free test effect is slightly better, after the fabric absorbs moisture, water evaporates through the pores and the hydrophilic cotton yarn in the coating structure yarn, and the total area available for water volatilization is reduced, resulting in a drying rate slightly lower than that of Example 1. This shows that the clever design of the count of the 3D sweat-free plain knitted fabric of this scheme also plays a key role in the sweat-free effect and drying rate.

[0060] Comparative Example 1

[0061] A 20S waterproof cotton yarn + 40S hydrophilic cotton yarn + 50D / 48F cross-section polyester yarn 3D plain fabric

[0062] (S1) taking 20S fine cotton siro compact spinning grey yarn, after boiling and bleaching, adding reactive dyes for dyeing, then adding 10% waterproofing agent and 2% cross-linking agent for treatment at 40°C for 30 minutes, and winding the dry yarn at 130°C for standby use;

[0063] (S2) taking 40S fine cotton compact spinning grey yarn, after boiling and bleaching, adding reactive dyes for dyeing, then adding 2% hydrophilic agent and 0.5% penetrant for treatment at 40°C for 30min, and winding the dry yarn at 100°C for later use;

[0064] (S3) taking 50D / 48F cross-section polyester yarn, after degreasing, adding disperse dyes for dyeing, and winding the dry yarn into a bobbin for later use;

[0065] (S4) The position of the yarn guide is adjusted in the order of waterproof cotton yarn on the outside, hydrophilic cotton yarn in the middle, and cross-section polyester yarn on the inside. The weaving structure is consistent with that in Example 1. The 3D plain fabric is woven by a large circular machine, washed in a vat, and shaped to obtain a 3D plain fabric with 20S waterproof yarn on the outside, 40S hydrophilic cotton yarn in the middle, and 50D / 48F cross-section polyester yarn on the inside. The fabric weight is 300±5g / m 2 .

[0066] The fabric made from comparative document 1 is also a 3D high-density fabric with inner, middle and outer layers, but its outer layer yarn uses waterproof cotton yarn, and the moisture of the fabric can only evaporate through the tiny pores of the fabric, and the overall drying rate is not as good as that of Examples 1-2.

[0067] Comparative Example 2

[0068] A double-sided fabric of 20S waterproof cotton yarn + 50D / 48F cross-section polyester yarn + 40S hydrophilic cotton yarn

[0069] (S1) taking 20S fine cotton siro compact spinning grey yarn, after boiling and bleaching, adding reactive dyes for dyeing, then adding 10% waterproofing agent and 2% cross-linking agent for treatment at 40°C for 30 minutes, and winding the dry yarn at 130°C for standby use;

[0070] (S2) taking 50D / 48F cross-section polyester yarn, after degreasing, adding disperse dyes for dyeing, and winding the dry yarn into a bobbin for later use;

[0071] (S3) taking 40S fine cotton compact spinning grey yarn, after boiling and bleaching, adding reactive dyes for dyeing, then adding 2% hydrophilic agent and 0.5% penetrant for treatment at 40°C for 30min, and winding the dry yarn at 100°C for later use;

[0072] (S4) Using waterproof cotton yarn as the outer fabric and hydrophilic cotton yarn as the inner fabric, using cross-section polyester as the connecting yarn to connect the outer fabric and the inner fabric, adjusting the front and rear needle bed positions to weave a double-sided fabric, washing in a vat, and shaping to obtain a double-sided fabric with 20S waterproof yarn on the outside, 50D / 72F cross-section polyester yarn in the middle, and 40S hydrophilic cotton yarn inside, and the fabric weight is 300±5g / m 2 .

[0073] Weave structure:

[0074]

[0075]

[0076] The fabric prepared in Comparative Example 2 is a traditional double-sided fabric. Although the inner layer of the fabric is made of hydrophilic cotton yarn, which makes the fabric have a better sweat absorption effect, the outer layer of the fabric is made of waterproof cotton yarn, which causes the hydrophilic cotton yarn to absorb moisture and swell after the fabric absorbs sweat, and the moisture can only evaporate on the outer surface through the tiny pores of the fabric, and it is difficult to evaporate and dry outward, causing the fabric to be stuffy and not breathable.

[0077] Comparative Example 3

[0078] A 20S waterproof cotton yarn + 40S hydrophilic cotton yarn + 50D / 48F cross-section polyester yarn 3D plain fabric

[0079] (S1) 20S cotton yarn is used as the outer yarn, 40S cotton yarn is used as the middle yarn, and 50D / 48F cross-section polyester yarn is used as the inner yarn to weave a 3D plain fabric. The weight of the obtained fabric is 300±5g / m 2 , boil the cloth in a vat to remove oil, add reactive dyes to dye cotton, and disperse dyes to dye polyester;

[0080] (S2) Fabric is dipped and rolled in hydrophilic soft oil and dried at 100℃;

[0081] (S3) A waterproof finishing agent is prepared with 10 g / L of a thickener, 2 g / L of a cross-linking agent, and 5 g / L of a waterproof agent, and is applied to one side of the outer cotton yarn by printing, and is shaped at 175° C. to obtain a fabric with a hydrophilic inner layer and a waterproof outer layer.

[0082] Although the weaving structure of the fabric prepared in Comparative Example 3 is the same as that in Example 1, the traditional printing method is used to achieve the effect of hydrophilic on one side and hydrophobic on the other side. Not only is the overall drying rate of the fabric not as good as that in Example 1, but it also feels hard and not breathable.

[0083] Performance test results

[0084] 1. Sweat-free test:

[0085] The fabrics prepared in Example 1 and Comparative Examples 1-3 were tested according to GB / T 21655.2-2019 "Evaluation of Moisture Absorption and Quick-drying Properties of Textiles Part 2: Dynamic Moisture Transfer Method", and the results are shown in Table 1:

[0086] Table 1

[0087]

[0088]

[0089] The results in Table 1 show that the inner layer of Examples 1-3 diffuses over an area of ​​more than 22 mm in 3 seconds after being wetted, and the fabric surface is not soaked during the 120-second test time. The inner and outer fabrics of Example 1 are shown in the sweat-free test. Figure 1-2 , which fully demonstrates that Examples 1-3 have excellent sweat-free performance, and the fabrics of Examples 1-3 have good performance stability before and after washing.

[0090] 2. Drying rate:

[0091] The fabrics prepared in Example 1 and Comparative Examples 1-3 were tested according to GB / T 21655.1-2023 "Evaluation of Moisture Absorption and Quick-Drying Properties of Textiles Part 1: Single Item Combination Test Method", and the results are shown in Table 2:

[0092] Table 3

[0093] Drying rate before washing (g / h) Drying rate after washing (g / h) Example 1 0.396 0.377 Example 2 0.384 0.352 Example 3 0.301 0.294 Comparative Example 1 0.284 0.276 Comparative Example 2 0.165 0.161 Comparative Example 3 0.143 0.152

[0094] The results in Table 2 prove that Examples 1-3 have a better drying speed than Comparative Examples 1-3, which means that the moisture in the sweat-free 3D plain knitted fabric of the present solution will not be stored for a long time to cause stuffiness, but will evaporate more quickly.

[0095] From the above sweat-free test and drying rate, it can be seen that this solution cleverly designs the outer, middle and inner 3D plain knitted fabrics and uses the principle of visual difference to prevent sweat from being visible after being absorbed, thereby achieving a good sweat-free effect. In addition, hydrophilic / waterproof coated cotton yarn is used as the surface layer instead of ordinary hydrophobic polyester or general waterproof cotton yarn to accelerate the evaporation rate of surface moisture; the middle layer uses hydrophilic cotton to quickly absorb moisture from the inner layer; the inner layer uses special-section polyester to increase water conductivity, which does not cause stuffiness and airtightness due to fiber swelling due to water absorption, thereby improving the wearing comfort of wet clothes.

[0096] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for preparing a sweat-free 3D plain knitted fabric, characterized in that: The following steps are involved: S1, yarn spare Preparation of outer yarn: taking cotton yarn, boiling and bleaching it, adding active dyes for dyeing, then adding hydrophilic additives for hydrophilic treatment or adding waterproof additives for waterproof treatment, and winding the dry yarn into bobbins to obtain hydrophilic cotton yarn and waterproof cotton yarn; coating the hydrophilic cotton yarn on the waterproof cotton yarn to obtain coated structure yarn, which is used as the outer yarn for standby use; the count of the hydrophilic cotton yarn is higher than the count of the waterproof cotton yarn; Preparation of intermediate yarn: taking cotton yarn, scalding and bleaching it, adding reactive dyes for dyeing, then adding hydrophilic additives for hydrophilic treatment, winding the dry yarn into a bobbin to obtain hydrophilic cotton yarn as intermediate yarn for standby use, wherein the thickness of the intermediate yarn is finer than that of the outer yarn; Preparation of inner layer yarn: taking waterproof synthetic fiber yarn, removing oil, adding disperse dyes for dyeing, winding the dry yarn into a bobbin to obtain waterproof yarn as the inner layer yarn for standby use; S2. Fabric weaving The position of the yarn guide is adjusted to control the output sequence of the outer yarn, the middle yarn and the inner yarn for weaving, and the yarns are washed in a vat and shaped to obtain a sweat-free 3D plain knitted fabric with the coated structure yarn on the outside, the hydrophilic cotton yarn in the middle and the waterproof yarn on the inside.

2. The method for preparing the sweat-free 3D plain knitted fabric according to claim 1, characterized in that: The gram weight of the fabric is (220-300) ± 5 g / m 2 .

3. The method for preparing the sweat-free 3D plain knitted fabric according to claim 1, characterized in that: The inner layer yarn uses cross-section polyester yarn as the raw yarn.

4. The method for preparing the sweat-free 3D plain knitted fabric according to claim 1, characterized in that: The twist number of the hydrophilic cotton yarn of the outer yarn wrapped around the waterproof cotton yarn is 200-500 twists / m, the count of the hydrophilic cotton yarn of the outer yarn is 80S-200S, and the count of the waterproof cotton yarn of the outer yarn is 20S-50S.

5. The method for preparing the sweat-free 3D plain knitted fabric according to claim 1, characterized in that: The count of the intermediate yarn is 40S to 80S.

6. The method for preparing the sweat-free 3D plain knitted fabric according to any one of claims 1 to 5, characterized in that: The hydrophilic cotton yarn of the outer yarn is made of refined cotton compact spinning as the raw yarn, and the waterproof cotton yarn of the outer yarn is made of refined cotton siro compact spinning as the raw yarn; the intermediate yarn is made of refined cotton compact spinning as the raw yarn.

7. The method for preparing the sweat-free 3D plain knitted fabric according to any one of claims 1 to 5, characterized in that: The hydrophilic auxiliary agent dosage components in S1 include: 0.1-3% of hydrophilic agent and 0.1-1.5% of penetrant.

8. The method for preparing the sweat-free 3D plain knitted fabric according to any one of claims 1 to 5, characterized in that: The waterproofing auxiliary agent dosage components in S1 include: 1-20% waterproofing agent, 0.1-3% cross-linking agent, and 0.01-0.1% acetic acid.

9. The method for preparing the sweat-free 3D plain knitted fabric according to any one of claims 1 to 5, characterized in that: The hydrophilic treatment and waterproof treatment in S1 are performed by adding corresponding auxiliaries to the yarn dyeing machine and treating at 40-60° C. for 10-60 minutes.

10. A sweat-free 3D plain knitted fabric, characterized in that: The fabric is a 3D plain knitted fabric with a covering structure yarn as an outer layer yarn, a hydrophilic cotton yarn as an intermediate yarn, and a waterproof yarn as an inner layer yarn; the covering yarn structure includes a core yarn and a covering yarn, the covering yarn is spirally wound around the core yarn to form an incomplete coverage, the core yarn is a waterproof cotton yarn, the covering yarn is a hydrophilic cotton yarn, the count of the hydrophilic cotton yarn is higher than the count of the waterproof cotton yarn; the thickness of the intermediate yarn is finer than the thickness of the outer layer yarn.

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