Preparation method of bio-based polyamide cool knitted fabric

Abstract

The invention provides a preparation method of a bio-based polyamide cool knitted fabric. The preparation method is characterized in that the preparation method is completed by adopting a circular knitting machine; the yarn arrangement mode is as follows: (3), (4), (5), (6), (7), (8) and (9); # imgabs 0 # is bio-based polyamide PA56; (1) (2) (10) imgabs 1 # are cool materials; the pin arrangement mode is as follows: 11221133; (3), (4), (5), (6), (7), (8) and (9) # imgabs2 # is a full-needle single jersey weaving plane; and a tuck breathable moisture-conducting groove type cool feeling structure is formed by the 10 # imgabs3 path (10) and the 10 # imgabs3 path (10). According to the embodiment of the invention, the cool polyester yarns are added and combined with a special weaving process, so that the heat on the skin surface is quickly lost and the temperature is instantly reduced at the moment when the fabric is in contact with the skin, and then the cool feeling is formed after the reaction of the nerve endings in the skin to the brain, and the fabric is particularly suitable for being worn and used in hot summer.

Description

Technical Field

[0001] The invention relates to the field of weaving, and in particular to a method for preparing a bio-based polyamide cool knitted fabric. Background Art

[0002] As consumers' health awareness continues to rise, promoting physical and mental health, exploring high-tech products to respond to public sentiment has become an indispensable topic. At the same time, consumers are increasingly paying attention to saving costs and reducing waste, and durable products that are reusable and recyclable will become more and more popular. The textile industry and the entire clothing industry will stand out for using the latest generation of innovative materials, with a clear preference for solutions based on renewable resources. They are called "next generation" materials, which are man-made polymers that have advantages in recyclability and, most importantly, promote the use of alternatives to fossil resources.

[0003] Bio-based fiber is a typical application. Bio-based fiber refers to fiber made from renewable organisms or biological extracts, which is different from fiber produced from non-renewable petrochemical resources such as coal and oil. According to the production process, bio-based fibers can be divided into bio-based native fibers and bio-based chemical fibers. Bio-based chemical fibers are fibers made from biomass or polymers containing biomass-derived monomers, which include bio-based regenerated fibers and bio-based synthetic fibers. The difference is that bio-based regenerated fibers do not change the original chemical structure of biomass macromolecules, and the spinning process is the reconstruction of their physical form; while the chemical and physical properties of bio-based synthetic fibers depend on the monomers used, and the original chemical structure of biomass macromolecules is completely changed.

[0004] Bio-based polyamide is a general term for thermoplastic resins containing repeating amide groups on the molecular chain. Fulgar, an Italian emerging company, announced the launch of Q-GEO, a new type of bio-based polyamide yarn, in which 46% of the fibers are made of bio-based polyamide. There are many studies on bio-based polyamide fabrics in the prior art: for example, Chinese patent CN105986327B discloses a method for preparing matte polyamide 56 fibers, in which polyamide 6 matte resin and polyamide 56 full-gloss resin particles are melt-mixed and then spun to obtain matte polyamide 56 fibers, so that the fibers can obtain anti-ultraviolet effects. Some other studies have pointed out that fabrics woven from polyamide 56 fibers can be immersed in an anti-wrinkle finishing solution containing chitosan, glycine hydrochloride, glutaraldehyde, glyoxal and water to obtain quick-drying anti-wrinkle bio-based polyamide fabrics. Thereby improving the moisture conductivity and moisture permeability of the fabric. However, the use of finishing liquid has the problem of additional effects. The effect of the solution may deteriorate during repeated washing. On the other hand, the use of finishing liquid will increase the cost and pressure of environmental protection treatment for pollution relief of enterprises.

[0005] Moisture-absorbing and quick-drying fabrics are a type of textiles with moisture-absorbing, moisture-conducting and quick-drying functions. Different fiber materials, fabric structures and post-finishing processing methods can achieve moisture-absorbing and quick-drying fabrics with different effects. It can also be explained that different material selection, weaving structure, weaving process, etc. will affect the moisture-absorbing and quick-drying effect of the fabric. Therefore, how to select materials and optimize the process to achieve a high-quality moisture-absorbing and quick-drying fabric has become a key development direction in this field. Summary of the invention

[0006] The present invention aims to overcome the above-mentioned defects. It adopts environmentally friendly bio-based polyamide PA56 and provides a cool knitted fabric with a tucked structure by improving the weaving method. The knitted fabric is mainly used in summer sports and leisure. It can not only solve the problem of polyester being stuffy and airtight, improve the moisture absorption and quick-drying effect of the fabric, but also enhance the wearing comfort.

[0007] The present invention provides a method for preparing a bio-based polyamide cool knitted fabric, which is characterized by:

[0008] It is completed by using a large circular knitting machine;

[0009] Yarn arrangement method: ③④⑤⑥⑦⑧⑨ All are bio-based polyamide PA56;

[0010] ①②⑩ All are cool feeling materials;

[0011] The pin arrangement is: 11221133;

[0012] No. ③④⑤⑥⑦⑧⑨ The road is a flat surface made of full-stitch sweat cloth;

[0013] No. ①②⑩ The road forms a cool groove structure that is breathable, moisture-conducting and cool.

[0014] Furthermore, the present invention provides a method for preparing a bio-based polyamide cool knitted fabric, which is also characterized by:

[0015] The loop-gathered, breathable, and moisture-conducting groove-type cooling structure is in a straight line shape.

[0016] Furthermore, the present invention provides a method for preparing a bio-based polyamide cool knitted fabric, which is also characterized by:

[0017] Yarn eating ratio: bio-based polyamide PA56: cool material is 19-25:1.

[0018] Furthermore, the present invention provides a method for preparing a bio-based polyamide cool knitted fabric, which is also characterized by:

[0019] The cool feeling material is selected from polyester, spandex or a mixture thereof.

[0020] Furthermore, the present invention provides a method for preparing a bio-based polyamide cool knitted fabric, which is also characterized by:

[0021] The first stitch of the front pattern is all looped;

[0022] The second stitch paths of the obverse pattern are: floating thread, floating thread, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop;

[0023] The third stitch path of the front pattern is: circle, circle, circle, circle, circle, circle, circle, circle, circle, floating line, floating line, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 , a triangular arrangement diagram of the fabric provided in this embodiment;

[0025] Figure 2 , fabric appearance. DETAILED DESCRIPTION

[0026] The present invention is capable of various modifications and various embodiments, and therefore specific embodiments are illustrated and described in the accompanying drawings. However, this is not intended to limit the present invention to specific implementations, but should be understood to include all modifications, equivalents, and even substitutes that fall within the concept and technical scope of the present invention.

[0027] Example 1. Bio-based polyamide cool knitted fabric

[0028] 1.1.Weaving process:

[0029] This embodiment uses bio-based polyamide PA56, cool polyester and spandex to weave a tuck mesh structure on a circular knitting machine, and the breathable moisture-conducting groove-type cool structure is a "straight-line" type, developing a new tuck weave fabric. The details are as follows:

[0030] It is completed using a 30” 28G large circular knitting machine.

[0031] Yarn arrangement method: ③④⑤⑥⑦⑧⑨ All are 100D / 68F bio-based polyamide PA56DTY, line length is 19cm / 50N, ①②⑩ They are all 50D / 36F cool polyester DTY, with a line length of 13.5cm / 50N. The yarn consumption ratio of bio-based polyamide PA56 DTY is 95.89%, and that of cool polyester DTY is 4.11%.

[0032] The pin arrangement is: 11221133, ③④⑤⑥⑦⑧⑨ The route is a full-needle sweat fabric weaving plane; The road forms a cool groove structure that is breathable, moisture-conducting and cool.

[0033] Triangle arrangement and knitting needle arrangement as follows Figure 1 As shown:

[0034] The first stitch of the front pattern is all circled.

[0035] The second stitch path of the front pattern is: floating line, floating line, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle.

[0036] The third stitch path of the front pattern is: circle, circle, circle, circle, circle, circle, circle, circle, circle, floating line, floating line, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle.

[0037] 1.2. Dyeing and finishing process design and production

[0038] The overall process of dyeing and finishing: cloth sorting → pre-treatment → dyeing → reduction cleaning → softening in the bath → shaping finishing → finished product inspection.

[0039] Example 2. Performance comparison test

[0040] 2.1. Experimental groups

[0041] Comparative Example 1.

[0042] The process and weaving structure remain unchanged, and the cool polyester DTY is replaced with ordinary polyester tuck.

[0043] Comparative Example 2.

[0044] Full jersey construction woven from bio-based polyamide PA56.

[0045] Comparative Example 3.

[0046] Made of regular polyester woven all jersey construction.

[0047] Comparative Example 4.

[0048] The yarn arrangement methods are as follows: ①⑧ are both 100D / 68F bio-based polyamide PA56 DTY full-needle sweat fabric woven flat structure;

[0049] ②③④⑤⑥⑦⑨⑩ They are all made of 50D / 36F cool polyester DTY to form a jacquard breathable and moisture-conducting groove structure.

[0050] 2.2. Cooling performance

[0051] The maximum transient heat flow method simulates the transient heat flow changes when human skin contacts fabrics. A large change in the maximum transient heat flow indicates that the fabric feels cool when in contact, and vice versa. The instantaneous contact feeling can be characterized by the contact coolness coefficient Qmax of the test calculator. The larger the Qmax value, the cooler the skin feels. Currently, the standards developed based on this method include the national standard GBT 35263-2017 "Testing and Evaluation of the Instantaneous Cooling Performance of Textiles", and the FTTS-TA-019 "Verification Specification for Instantaneous Cooling of Fabrics" specified by the Institute of Comprehensive Textile Industry in Taiwan, China. It is generally believed that the maximum instantaneous heat flow value is greater than 0.15W / cm 2 The fabric feels cooler, less than 0.10W / cm 2 The fabric has a more obvious warmth.

[0052] The national standard GBT 35263-2017 "Testing and evaluation of instantaneous cooling properties of textiles" was used for testing, and the test results of the development fabric and the control group are shown in the following table.

[0053] Table of contact coldness coefficients of developed and control fabrics

[0054]

[0055] From the table above, we can see that the instantaneous contact cooling coefficient Qmax of the developed fabric is 0.24W / cm 2 , the cool feeling of the developed fabrics is more obvious.

[0056] The contact coldness of the ordinary polyester tuck control group 1 fabric is significantly reduced.

[0057] The contact cold feeling of the fabric in the control group 2, which is made of bio-based polyamide PA56 all-jersey fabric, is not obvious.

[0058] The fabric of the ordinary polyester jersey control group 3 failed to meet the cold sensation test standard and did not have the function of contact cooling.

[0059] The other knitting processes obtained the control group 4 full-needle jersey plane + tucked loop breathable moisture-conducting groove-type cool feeling structure, which has good environmental protection, cool feeling and moisture absorption and quick-drying performance, but it can be found from the results that its cool feeling effect is not as good as the solution of this embodiment. The reason for this result may be that compared with this structure, the jersey plane of the present invention is larger, the breathable moisture-conducting groove-type cool feeling structure is "straight-line", and the tucked loop structure accounts for a smaller proportion of the fabric surface, which further improves the fabric's washing shape retention and anti-snagging performance.

[0060] 2.3. Moisture absorption and quick drying performance

[0061] The hygroscopicity was tested in accordance with GB / T 21655.1-2008 “Assessment of Moisture Absorption and Quick-drying Properties of Textiles”. The hygroscopicity and quick-drying properties of the developed fabric and the control fabric are shown in the table below.

[0062] Moisture absorption and quick-drying performance table of developed fabrics and control fabrics

[0063]

[0064] From the above table, we can find that the air permeability and moisture conductivity of the developed fabric after washing are: water drop diffusion time <1s, water absorption rate 225%, wicking height: vertical 136mm, horizontal 132mm, evaporation rate 0.22g / h, moisture permeability 1.02*10 4 g / (m 2 24h), showing that the fabric has good air permeability and moisture conduction performance. Obviously, the fabric has good air permeability, does not suffocate sweat, has a good body feel, and has an obvious cool feeling, which is suitable for summer fabrics.

[0065] The fabric of the ordinary polyester tuck control group 1 has certain air permeability and moisture conduction performance;

[0066] The air permeability and moisture conduction performance of the control group 2 fabric, which is made of bio-based polyamide PA56 all-jersey, is poor;

[0067] The air permeability and moisture conduction performance of the ordinary polyester jersey control group 3 fabric is also poor.

[0068] Other weaving processes obtained the control group 4's full-needle sweat fabric plane + looped breathable moisture-conducting groove type cool structure, and the breathability was also good.

[0069] In summary, through comparative experiments, it is found that using bio-based polyamide PA56 and cool polyester yarn as raw materials, through the appropriate combination of different hydrophilic and hydrophobic yarns, moisture-conducting fabrics can be prepared. In the weaving process, the tuck process is further designed to design the air permeable pore structure, which can make the water evaporate quickly, improve the air permeability and wicking effect of the fabric, and enable the water vapor on the inside of the fabric to be quickly transferred to the outside of the fabric, which can meet the human body's breathability, lifting and elasticity needs while improving the fabric's moisture absorption and perspiration function. Bio-based cool tuck fabrics are soft in texture, skin-friendly and non-sticky, have good wrinkle resistance and air permeability, and have greater extensibility and elasticity, which improves the comfort of wearing.

[0070] Functions and effects of this embodiment:

[0071] This embodiment combines the addition of cool polyester yarn with a special weaving process, so that the moment the fabric comes into contact with the skin, the heat on the skin surface is lost quickly, the temperature drops instantly, and then reacts to the brain through the sensory nerve endings in the skin to form a cool feeling. It is particularly suitable for wearing and using in hot summer. From the above comparative experiments, it can be found that the solution adopted in this patent can further enhance the cool feeling. You will not feel hot even if you wear it for a long time, and you can still feel a constant coolness.

[0072] Specifically:

[0073] This embodiment uses bio-based polyamide PA56 and cool polyester yarn as raw materials, and adopts a jacquard structure to weave a needle fabric with floating threads. The fabric has a soft texture, is skin-friendly but not sticky, has good wrinkle resistance and breathability, and has greater extensibility and elasticity, thereby enhancing the comfort of wearing.

[0074] This embodiment changes the weaving method and weaves two types of fibers into a jacquard structure with air permeable holes, which can allow moisture to evaporate quickly, improve the air permeability and wicking effect of the fabric, and enable water vapor from the inside of the fabric to be quickly transferred to the outside of the fabric.

[0075] The bio-based polyamide PA56 in this embodiment is sourced from Shanghai Cathay Biotechnology Co., Ltd. Bio-based polyamide PA56 (Taylon) is a polymer synthesized from bio-based pentamethylenediamine and petroleum-based adipic acid, with a bio-based content of more than 40%. The fabric prepared with it has excellent moisture absorption properties. Compared with petroleum-based polyamide, whose monomers are derived from renewable materials such as castor oil and grape oil, bio-based polyamide can reduce dependence on petroleum resources and carbon dioxide emissions, and has the advantages of low carbon, environmental protection, and sustainable development, which is in line with the development trend of new materials in the future.

[0076] This embodiment adds cool polyester yarn, and optimizes the weaving structure and process, so that the heat on the skin surface is lost quickly when the fabric contacts the skin, and the temperature drops instantly, and then reacts to the brain through the sensory nerve endings in the skin to form a cool feeling, which is particularly suitable for wearing and using in hot summer. The cool feeling is further enhanced, and you will not feel hot even if you wear it for a long time, and you can still feel a constant coolness.

[0077] Although the above description is centered on the embodiment, it is only an example and does not limit the present invention. It is clear to those skilled in the art that various modifications and applications not illustrated above can be made within the scope of the essential characteristics of the present embodiment. For example, each component specifically shown in the embodiment can be implemented after being modified. Moreover, various differences related to such modifications and applications should be interpreted as being included in the scope of the present invention as defined in the attached claims.

Claims

1. A method for preparing a bio-based polyamide cool knitted fabric, characterized in that: It is completed by using a large circular knitting machine; Yarn arrangement method: ③④⑤⑥⑦⑧⑨ All are bio-based polyamide PA56; ①②⑩ All are cool feeling materials; The pin arrangement is: 11221133; No. ③④⑤⑥⑦⑧⑨ The road is a flat surface made of full-stitch sweat cloth; No. ①②⑩ The road forms a cool groove structure that is breathable, moisture-conducting and cool.

2. The method for preparing a bio-based polyamide cool knitted fabric according to claim 1, characterized in that: The loop-gathered, breathable, and moisture-conducting groove-type cooling structure is in a straight line shape.

3. The method for preparing a bio-based polyamide cool knitted fabric according to claim 1, characterized in that: Yarn eating ratio: bio-based polyamide PA56: cool material is 19-25:

1.

4. The method for preparing a bio-based polyamide cool knitted fabric according to claim 1, characterized in that: The cool feeling material is selected from polyester, spandex or a mixture thereof.

5. The method for preparing a bio-based polyamide cool knitted fabric according to claim 1, characterized in that: The first stitch of the front pattern is all looped; The second stitch paths of the obverse pattern are: floating thread, floating thread, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop, loop; The third stitch path of the front pattern is: circle, circle, circle, circle, circle, circle, circle, circle, circle, floating line, floating line, circle, circle, circle, circle, circle, circle, circle, circle, circle, circle.

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