CN110699803A

CN110699803A - Moisture-absorbing warm-keeping yarn and preparation method thereof

Info

Publication number: CN110699803A
Application number: CN201910956573.4A
Authority: CN
Inventors: 陈国仲; 李洋; 李洪; 汪珊; 史志颖
Original assignee: Lilang China Co Ltd
Current assignee: Lilang China Co Ltd
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2020-01-17

Abstract

The moisture-absorbing and warm-keeping yarn is obtained by blending a first fiber, a second fiber and a third fiber, wherein the heat conductivity coefficient of the first fiber is less than 0.060; the moisture regain of the second fiber is more than 10%, and the third fiber is a hollow fiber. The yarns have moisture absorption and heat generation properties, and the fibers with high moisture regain can bring high moisture absorption, so that the moisture absorption of the yarns can be further improved by combining the hollow structure, the fibers are promoted to convert water vapor into heat energy, the integral temperature rise effect of the yarns is provided, and the moisture absorption and heat generation of the yarns are further promoted; selecting fibers with smaller heat conductivity coefficient, and storing heat energy emitted by a human body and heat energy generated by heating of yarns by utilizing the heat capacity of the fibers; the moisture absorption heating performance of the yarn is improved to the greatest extent through the selection of the fiber raw materials, the moisture absorption performance of the yarn is strong, the heating effect is obvious, moisture absorption heating circulation can be repeatedly carried out for a long time according to the environment, the temperature of the skin and clothes is accelerated, and the temperature difference between the skin and the clothes is moderated and adjusted.

Description

Moisture-absorbing warm-keeping yarn and preparation method thereof

Technical Field

The invention relates to the technical field of yarns, in particular to a moisture-absorbing warm-keeping yarn and a preparation method thereof.

Background

In recent years, with the improvement of living standard of people, the requirements on the comfort and the functionality of clothes or clothes fabrics are higher and higher, and the wearing comfort of the clothes is closely related to the moisture absorption and release characteristics of materials. Therefore, the research and development of water-absorbing and sweat-absorbing fibers at home and abroad are more and more important.

In winter, when ordinary close-fitting clothes are worn, a human body feels cold, the person just sleeps into the chemical fiber quilt and feels colder than a cotton quilt and a wool quilt, the cold and hot temperature difference exists between skin and clothes, so that heat conduction occurs, the clothes are often covered by the body, and the clothes are particularly worried and uncomfortable in the morning in winter. Therefore, the warm-keeping clothes are an indispensable product in the market, and with the thinning of clothes, the clothes which are traditionally warm-keeping by increasing the thickness to prevent heat loss gradually quit the selection range of consumers. Compared with the prior art that the heat preservation characteristic of the fabric is improved through the post-finishing processes such as coating, calendaring and the like, the blended fabric and the functional fabric have great advantages in multiple aspects such as comfort, heat preservation and the like, and the moisture-absorbing heating fibers can be utilized to endow the fabric with the heat-generating effect.

The principle of moisture absorption and heat generation is as follows: (1) the polar groups with strong hydrophilicity on the fiber molecules in the yarns are combined with the water vapor molecules with high kinetic energy in the air through hydrogen bonds, so that the water vapor molecules with high kinetic energy are adsorbed by the fiber molecules and are static, and the principle of energy conservation shows that an object is changed from dynamic state to static state, and the kinetic energy is necessarily converted into heat energy under the condition of no potential energy change, so that the fiber material has the moisture absorption and heating performance; (2) the energy change generated by the phase change phenomenon is utilized, namely, the water vapor releases heat to the outside when being converted into liquid. The yarn absorbs water vapor in air or emitted by human body, and converts the water vapor into liquid to generate heat, so that the yarn has the functions of moisture absorption and heat generation.

The high-moisture-absorption heating fiber with a graft copolymerization structure in the market is mainly imported from Japan, and the fiber is expensive and has a limit on the application of a final product. Most of existing moisture absorption warm-keeping yarns have a certain heat preservation effect and can achieve the effect of moisture absorption and heat generation, but the actual heat generation warm-keeping effect is unstable, the moisture regain of cotton fibers cannot be achieved, and the same warm-keeping performance of wool fibers can be guaranteed, so that the production of the high-performance moisture absorption warm-keeping yarns is a subject to be completed urgently.

Disclosure of Invention

The invention provides the moisture-absorbing warm-keeping yarn and the preparation method thereof, aiming at solving the problems that although the moisture-absorbing warm-keeping yarn has a certain heat-keeping effect and can absorb moisture and generate heat, the actual heat-generating warm-keeping effect is unstable, the moisture regain of cotton fiber and the same warm-keeping performance of wool fiber are not achieved, the price of imported fiber is high, and the requirements of people on the quality and the price of fabric cannot be met.

On one hand, the invention provides a moisture-absorbing and warm-keeping yarn, which is obtained by blending a first fiber, a second fiber and a third fiber, wherein the heat conductivity coefficient of the first fiber is less than 0.060; the moisture regain of the second fiber is more than 10%, and the third fiber is a hollow fiber; preferably, the first fibers have a thermal conductivity of 0.035 to 0.060; the moisture regain of the second fiber is 10-20%, and the third fiber is C-shaped hollow fiber.

Further, the first fibers comprise acrylic fibers and/or wool fibers, the second fibers comprise modal fibers and/or cotton fibers, and the third fibers comprise protein-modified viscose fibers.

Further, the mass ratio of the third fibers is 35 to 45%.

Further, the mass ratio of the first fibers is 35-45%.

Further, the yarn count of the moisture-absorbing and warm-keeping yarn is 45-55S.

Further, the first fiber specification is 0.6-1.2D, the second fiber specification is 0.8-1.6D, and the third fiber specification is 1.0-1.8D.

Furthermore, the heat conductivity coefficient of the moisture-absorbing and warm-keeping yarn is 0.050-0.060, the moisture regain is 8-9%, and the specific heat capacity is 1.2-1.5.

On the other hand, the invention provides a preparation method of the moisture-absorbing warm-keeping yarn, which is used for preparing the moisture-absorbing warm-keeping yarn and comprises the following steps:

1) the opening picking and cotton carding process comprises the following steps: respectively carrying out opening picking and cotton carding processes on the first fiber, the second fiber and the third fiber to respectively form a first fiber sliver, a second fiber sliver and a third fiber sliver;

2) drawing: feeding the carded first fiber sliver, the carded second fiber sliver and the carded third fiber sliver in a ratio of 6, and drawing in a merging and mixing mode for 3 times;

3) roving: feeding the drawn sliver formed in the drawing process into a roving drafting device through a sliver guide roller and a horn mouth, drafting the drawn sliver into strands with specified linear density, outputting the strands through a front roller, and twisting the strands into roving through a flyer;

4) spinning: feeding the roving into a spun yarn drafting device through a horn mouth for drafting, outputting the drafted fiber strands by a front roller, twisting the fiber strands through a steel collar and a steel traveler, and finally winding the fiber strands on a bobbin; the number of the steel wire ring is R + F10/0, and the twisting coefficient during twisting is 340-;

5) a spooling process: the yarn is unwound from the bobbin, passes through the yarn guide, the tension device and the yarn cleaner, and is wound on a bobbin to form a cone yarn, namely the moisture-absorbing and warm-keeping yarn.

Furthermore, the feeding proportion of the raw slivers in the drawing process is 35-45% of the first fibers, 10-30% of the second fibers and 35-45% of the third fibers.

Further, the cotton carding process parameters comprise: the rotating speed of the cylinder is 320-340r/min, the distance between the licker-in and the cotton feeding plate is 0.32-0.40mm, and the distances between the cylinder and the four points of the cover plate of the carding machine are 0.19-0.21mm, 0.17-0.19 mm and 0.19-0.21 mm.

Furthermore, in the drawing process, the drafting multiple of the zone after primary drawing is 1.82-1.90 times, the drafting multiple of the zone after secondary drawing is 1.70-1.78 times, and the drafting multiple of the zone after tertiary drawing is 1.30-1.38 times.

Furthermore, a compact siro spinning process is adopted in the spinning process, the draft multiple of the rear zone is 1.13-1.23, the total draft multiple is 55-65, the speed of the front roller is 165-185r/min, and the spindle rotation speed is 13000-15000 r/min.

According to the technical scheme, the invention has the beneficial effects that:

1. the moisture-absorbing warm-keeping yarn is blended by the fibers with high moisture regain and the fibers with the hollow structures, the yarns have moisture-absorbing heat-generating property, the fibers with high moisture regain can bring high moisture absorption to the yarns, the moisture absorption of the yarns can be further improved by combining the fibers with the hollow structures, the fibers can be further promoted to convert water vapor into heat energy, the integral temperature rise effect of the yarns is provided, and the moisture absorption and heat generation of the yarns are further promoted; the fiber with a small heat conductivity coefficient is selected, the heat energy emitted by a human body and the heat energy generated by the heating of the yarn are stored by utilizing the heat capacity of the fiber, and the heat in the fabric can be effectively stored due to the small heat conductivity coefficient and the large specific heat capacity, so that the heat insulation performance of the yarn is improved; the moisture absorption and heating performance of the yarn is improved to the greatest extent through the selection of fiber raw materials, the moisture absorption of the yarn is strong, the heating effect is obvious, moisture absorption and heating circulation can be repeatedly carried out for a long time according to the environment, the temperature of skin and clothes is accelerated to be balanced, and the temperature difference between the skin and the clothes is moderated and adjusted; in addition, the cold feeling after sweating can be prevented, and the clothes can be dry and comfortable for a long time.

2. The moisture-absorbing warm-keeping yarn selects acrylic fiber and/or wool fiber with smaller heat conductivity coefficient, modal fiber and/or cotton fiber with higher moisture regain and protein modified viscose fiber with a hollow structure; when the fibers are proportioned, 40% of acrylic fibers and/or wool fibers, 19% of modal fibers and/or cotton fibers and 40% of protein modified viscose fibers are selected, so that the comprehensive wicking effect heating value of the yarn is greatly improved; the more the number of fibers contained in the yarn body under the same yarn count specification is, the stronger the wicking effect of the whole yarn is, the more obvious the moisture absorption and heating effect of the yarn is, and the spinnability and the realization of functionality are both considered, wherein the yarn count of the moisture absorption and heat preservation yarn is selected to be 45-55S; the first fiber is 0.6-1.2D, the second fiber is 0.8-1.6D, and the third fiber is 1.0-1.8D, so that the heating and warming performance, high moisture regain and strong wicking effect similar to wool are realized through the fiber raw material proportion and the yarn specification, and the excellent moisture absorption and heating performance of the yarn is realized.

3. In order to give consideration to both the yarn strength and the fiber cohesion, compact siro spinning is selected in the preparation method of the moisture-absorbing and warm-keeping yarn; fully and uniformly mixing the three fibers in the blending process, respectively and independently processing and producing the three fibers in an opening and picking process and a cotton carding process, respectively forming raw slivers from the three fibers, and mixing the three fibers in proportion in a drawing process; the straightening parallelism of the fibers is improved by controlling the back zone drafting multiple of the three times of drawing in the drawing process, so that the evenness of the cooked slivers is improved; by adjusting spinning process parameters, yarn hairiness and yarn breakage rate are reduced, so that the integral yarn evenness of the yarn is improved, the yarn quality is improved, and the production efficiency is improved.

Detailed Description

The principles and features of this invention are described below, with examples provided to illustrate the invention and not to limit the scope of the invention; the present invention is more particularly described in the following paragraphs by way of example. Advantages and features of the present invention will become apparent from the following description and from the claims.

Detailed description of the preferred embodiment

A moisture-absorbing and warm-keeping yarn is obtained by blending a first fiber, a second fiber and a third fiber, wherein the heat conductivity coefficient of the first fiber is less than 0.060; the moisture regain of the second fiber is more than 10%, and the third fiber is a hollow fiber;

the heating function of the yarn is realized by mainly utilizing the fiber to absorb water vapor evaporated by a human body and convert the water vapor into heat energy to provide a heating effect, the moisture absorption and the wicking effect of the fiber have great influence on the overall heating performance of the yarn, the second fiber adopts modal fiber and cotton fiber with higher moisture regain, and the third fiber adopts protein modified viscose fiber with a C-shaped hollow structure; the yarn has the warm-keeping function, the heat capacity of the fiber is mainly utilized to store heat energy emitted by a human body and heat energy generated by heating of the yarn, the heat conductivity coefficient and specific heat capacity of the fiber have decisive effects, and the first fiber is acrylic fiber and/or wool fiber with smaller heat conductivity coefficient; thus, preferably, the first fibers comprise acrylic fibers and/or wool fibers, the second fibers comprise modal fibers and/or cotton fibers, and the third fibers comprise protein-modified viscose fibers;

according to the moisture regain of a pure cotton product, the heat conductivity coefficient of wool fibers is 0.054, the specific heat capacity is 1.36, the first fibers account for 35-45%, the second fibers account for 55-65%, the heat conductivity coefficient of blended yarns is 0.050-0.060, the moisture regain is 8-9%, and the specific heat capacity is 1.2-1.5, so that the moisture absorption and insulation yarn has the moisture regain equivalent to the cotton fibers on one hand, and the heating and insulation performance equivalent to wool on the other hand can be guaranteed; preferably, the first fiber is an acrylic fiber, the second fiber is a modal fiber, the third fiber is a protein modified viscose fiber with a C-shaped hollow structure, and preferably, biomass antibacterial components such as chitin and the like can be added into the third fiber to endow the yarn with an antibacterial function; wherein the mass ratio of the first fibers is 40%, the mass ratio of the second fibers is 20%, and the mass ratio of the third fibers is 40%; the fineness of the fibers has great influence on the realization of the moisture absorption and heat generation performance of the yarn, the finer the fineness of the fibers is, the more the number of the fibers contained in the yarn body under the same yarn count specification is, the stronger the wicking effect of the whole yarn is, and the more obvious the moisture absorption and heat generation effect of the yarn is, so that the realization of the spinnability and the functionality is considered, and the yarn count of the moisture absorption and heat preservation yarn is selected to be 45-55S; the first fiber is 0.6-1.2D, the second fiber is 0.8-1.6D, and the third fiber is 1.0-1.8D.

Detailed description of the invention

The second embodiment is substantially the same as the first embodiment, except that: the moisture-absorbing and warm-keeping yarn is obtained by blending a first fiber, a second fiber and a third fiber, wherein the mass ratio of the first fiber is 40%, the mass ratio of the second fiber is 30%, and the mass ratio of the third fiber is 30%.

Detailed description of the preferred embodiment

The third embodiment is substantially the same as the first embodiment, except that: the moisture-absorbing and warm-keeping yarn is obtained by blending a first fiber, a second fiber and a third fiber, wherein the mass ratio of the first fiber is 40%, the mass ratio of the second fiber is 10%, and the mass ratio of the third fiber is 50%.

Detailed description of the invention

The fourth embodiment is substantially the same as the first embodiment, except that: the moisture-absorbing and warm-keeping yarn is obtained by blending a first fiber, a second fiber and a third fiber, wherein the mass ratio of the first fiber is 45%, the mass ratio of the second fiber is 10%, and the mass ratio of the third fiber is 45%.

Detailed description of the preferred embodiment

The fifth embodiment is substantially the same as the first embodiment except that: the moisture-absorbing and warm-keeping yarn is obtained by blending a first fiber, a second fiber and a third fiber, wherein the mass ratio of the first fiber is 35%, the mass ratio of the second fiber is 10%, and the mass ratio of the third fiber is 55%.

The fabric made of the moisture-absorbing warm-keeping yarns disclosed in the first to fifth embodiments is subjected to moisture-absorbing heat-generating performance test according to the test method of GB/T29866-2013, wherein the first fibers are acrylic fibers, the second fibers are modal fibers, and the third fibers are protein-modified viscose fibers with a C-shaped hollow structure, and the results are shown in Table 1;

table 1: examples one to five of the moisture-absorbing and heat-retaining yarns prepared in the examples have the moisture-absorbing and heat-generating performance index

Practice of Example (b)	Acrylic fiber （wt%）	Modal fiber （wt%）	Protein modified viscose fiber Vitamin (wt%)	Maximum temperature rise Value (. degree. C.)	Mean temperature rise within 30min High value (. degree. C.)	CV value （%）
							A	40	20	40	6.145	4.142	2.1
II	40	30	30	3.291	2.009	4.9
							III	40	10	50	5.423	3.768	2.3
Fourthly	45	10	45	5.681	3.095	2.8
							Five of them	35	10	55	4.672	3.824	3.7

Experimental data prove that when the acrylic fiber is 35-45% and the protein modified viscose fiber is 35-45%, the maximum temperature rise value and the average temperature rise value within 30min of a sample in a moisture absorption and heat generation test are higher, and the variation coefficient is less than 8%, so that the stability and the repeatability of the moisture absorption and heat generation performance test method are better; when the content of the protein modified viscose fiber is 40%, the comprehensive wicking effect calorific value of the yarn is greatly improved, so that the yarn is preferably the moisture-absorbing and warm-keeping yarn of the first embodiment, wherein the mass ratio of the first fiber is 40%, the mass ratio of the second fiber is 20%, and the mass ratio of the third fiber is 40%;

the heat preservation performance of the knitted fabric made of the moisture-absorbing and heat-insulating yarn in the first embodiment is tested, the heat preservation rate is tested according to a test method of GB/T11048-;

table 2: knitted fabric made of the moisture-absorbing warm-keeping yarn of example one has a thermal insulation performance index

Examples	Heat insulation Rate (%)	Thermal resistance (m)²*K/W）
			A	42	0.4602

The moisture-absorbing warm-keeping yarn realizes the heating and warm-keeping performances like wool, high moisture regain and strong wicking effect through multiple aspects of fiber raw material selection, proportion, yarn specification and the like, thereby realizing the excellent moisture-absorbing and heating performances of the yarn.

On the other hand, the invention discloses a preparation method of moisture-absorbing and warm-keeping yarns, which is used for preparing the moisture-absorbing and warm-keeping yarns, and the following description takes the first fibers as acrylic fibers, the second fibers as modal fibers and the third fibers as protein modified viscose fibers with a C-shaped hollow structure as an example, and the preparation method of the moisture-absorbing and warm-keeping yarns comprises the following steps:

1) the opening picking and cotton carding process comprises the following steps: respectively carrying out opening picking and cotton carding processes on the acrylic fiber, the modal fiber and the protein modified viscose fiber with the C-shaped hollow structure to respectively form raw slivers;

specifically, the opening and picking process is carried out on the three fibers in a 'bag mixing and twice blowing' mode respectively, so that the fibers are uniformly mixed under the condition of full opening; the opening and picking process comprises the following steps: the process principle of 'more loosening and less beating and noil reduction' is adopted, and the distance from each beater to a dust rod is the smallest to reduce noil; increasing the pressure of a compacting roller, and embedding 3-5 pieces of rough yarn during blowing and coiling so as to prevent the phenomenon of coil sticking during uncoiling; impurity removal, short velvet, foreign fiber and the like are finished in a blowing workshop, the impurity removal rate is controlled, and then the cotton fiber is rolled and conveyed to a cotton carding process;

because the fineness of the three fibers is different, the fine denier fiber is not suitable for being excessively carded in a carding process, and the aim of carding, mixing and removing fiber defects is fulfilled, a low-speed and small-spacing process is adopted in the carding process, the rotating speed of a cylinder is reduced, the spacing between a licker-in and a cotton feeding plate is reduced, less grabbing and less beating are realized, and meanwhile, the spacing between the cylinder and a cover plate is properly increased, so that the quick transfer of a web is facilitated, and the damage to the fine denier fiber is reduced; the specific carding process comprises the following steps: sending the cotton roll formed in the opening and cleaning process into a cover plate carding machine through a roller, carding the cotton roll in the carding machine sequentially through a licker-in, a cylinder cover plate and a doffer, and collecting the cotton roll into a raw strip through a bell mouth, wherein the rotating speed of the cylinder is controlled to be 340r/min, the rotating speed of the licker-in is 650 + 700 r/min, the speed of the cover plate is 70-90 mm/min, the ration is 18.5 g/5 m, the spacing between the licker-in and a cotton feeding plate is 0.32-0.40mm, the spacing between the cylinder and the licker-in is 0.12-0.24mm, the spacing between the cylinder and the doffer is 0.08-0.18 mm, and the four-point spacing between the cylinder and the cover plate of the carding machine is 0.19-0.21mm, 0.17-0.19 mm and 0.21 mm; the defects of the raw strips are controlled within 10 grains/gram;

the specific drawing process comprises the following steps: feeding carded raw slivers of the three fibers into a drawing device of a drawing frame through a roller according to a ratio, condensing the drafted and mixed slivers to obtain mature slivers, regularly looping the slivers in a sliver can through a coiler, feeding the slivers in the sliver can into the drawing device again after primary drawing is finished, repeating the operation, and finishing tertiary drawing; in order to promote the fiber separation of three fibers and improve the straightening parallelism of the fibers and improve the evenness of drawn slivers, the draft multiple of a back area after primary drawing is controlled to be 1.82-1.90 times, the draft multiple of a back area after secondary drawing is controlled to be 1.70-1.78 times, and the draft multiple of a back area after tertiary drawing is controlled to be 1.30-1.38 times in the drawing process; in the drawing process, the raw sliver feeding proportion is 35-45% of acrylic fiber, 10-30% of modal fiber and 35-45% of protein modified viscose fiber;

the working parameters in the specific drawing process further comprise: the primary drawing ration is 15.0-15.5 g/5 m, the total drafting multiple is 7.0-7.5 times, and the drawing speed is 215-225 m/min; the total draft multiple of the secondary drawing is 5.5-6.5 times, the quantity of the tertiary drawing is 15.8-16.2 g/5 m, the total draft multiple is 5.2-6.2 times, and the drawing speed is 215-225 m/min; the unevenness of the drawn sliver is controlled below 4 percent;

3) roving: feeding the drawn sliver formed in the drawing process into a roving drafting device through a sliver guide roller and a horn mouth, drafting the drawn sliver into strands with specified linear density, outputting the strands through a front roller, and twisting the strands into roving through a flyer; the drawn sliver formed in the drawing process is fed into a roving drafting device through a sliver guide roller and a horn mouth, the drawn sliver is drafted into strands with specified linear density, then the strands are output through a front roller and twisted into roving through a flyer, the drawn sliver is further drafted, the fiber uniformity is improved, and the structure and the length unevenness of a sliver are improved; in the step, the dry weight of the roving is controlled to be 2.8-3.2g/10m, the total draft multiple is 10-14 times, the draft multiple of the rear zone is 1.1-1.4 times, the roller rotating speed is 225 and 230 r/min, and the unevenness of the roving is controlled to be below 4.5 percent;

4) spinning: feeding the roving into a spun yarn drafting device through a horn mouth for drafting, outputting the drafted fiber strands by a front roller, twisting the fiber strands through a steel collar and a steel traveler, and finally winding the fiber strands on a bobbin;

the spinning process has obvious influence on yarn evenness, and the number of the steel wire ring is R + F10/0 in the spinning process, so that the tension of a spinning air ring is controlled, and yarn hairiness is reduced; in order to reduce yarn breakage, the twisting coefficient of the fiber is properly increased, and the twisting coefficient is 340-350 during twisting; in the step, a compact siro spinning process is adopted, the twist is 970-990T/m, the draft multiple of a rear zone is 1.13-1.23, the total draft multiple is 55-65, the speed of a front roller is 165-185r/min, and the rotating speed of a spindle is 13000-15000 r/min;

5) a spooling process: the yarn is unwound from the bobbin, passes through the yarn guide, the tension device and the yarn cleaner, and is wound on a bobbin to form a cone yarn, namely the moisture-absorbing and warm-keeping yarn; this step uses an electronic clearer to remove defects caused by machines or workers during the spinning process, and yarns of different uses have different requirements on the clearer process, such as: for producing knitting yarn, the detailed requirement for the yarn is strict, the automatic detection value of the slub can be properly increased, and the detection value of the detail can be strictly controlled, so that the yarn defect can be well eliminated, the resultant yarn quality can be improved, and the production efficiency can be improved, therefore, the process parameters of the electric cleaning process can be adjusted, and meanwhile, the winding tension can be adjusted to control the yarn hairiness, and the method comprises the following steps: the drum speed is 1150-1250 m/min, and the winding tension is 7.5-8.5 cN.

It should be noted that the above embodiments are only preferred embodiments for clearly explaining the present invention, and those skilled in the art should make various changes and additions without inventive step on the basis of the present invention, which fall within the protection scope of the present invention.

Claims

1. A moisture-absorbing warm-keeping yarn is characterized in that: the yarn is obtained by blending a first fiber, a second fiber and a third fiber, wherein the heat conductivity coefficient of the first fiber is less than 0.060; the moisture regain of the second fiber is more than 10%, and the third fiber is a hollow fiber.

2. The moisture-absorbing and warm-keeping yarn as claimed in claim 1, wherein: the first fibers comprise acrylic fibers and/or wool fibers, the second fibers comprise modal fibers and/or cotton fibers, and the third fibers comprise protein-modified viscose fibers.

3. The moisture-absorbing and warm-keeping yarn as claimed in claim 1, wherein: the mass ratio of the third fibers is 35-45%.

4. The moisture-absorbing and warm-keeping yarn as claimed in claim 1, wherein: the mass ratio of the first fibers is 35-45%.

5. The moisture-absorbing and warm-keeping yarn as claimed in any one of claims 1 to 4, wherein: the yarn count of the moisture-absorbing and warm-keeping yarn is 45-55S.

6. The moisture-absorbing and warm-keeping yarn as claimed in any one of claims 1 to 4, wherein: the first fiber specification is 0.6-1.2D, the second fiber specification is 0.8-1.6D, and the third fiber specification is 1.0-1.8D.

7. The moisture-absorbing and warm-keeping yarn as claimed in any one of claims 1 to 4, wherein: the heat conductivity coefficient of the moisture-absorbing and warm-keeping yarn is 0.050-0.060, the moisture regain is 8-9%, and the specific heat capacity is 1.2-1.5.

8. A preparation method of moisture-absorbing warm-keeping yarns is characterized by comprising the following steps: use of the hygroscopic warm-keeping yarn of any one of claims 1 to 7 for the preparation of a yarn comprising the steps of:

9. The method for preparing the moisture-absorbing warm-keeping yarn according to claim 8, wherein the method comprises the following steps: the feeding proportion of the raw slivers in the drawing procedure is 35-45% of the first fibers, 10-30% of the second fibers and 35-45% of the third fibers.

10. The method for preparing the moisture-absorbing warm-keeping yarn according to claim 8, wherein the method comprises the following steps: the cotton carding process parameters comprise: the rotating speed of the cylinder is 320-340r/min, the distance between the licker-in and the cotton feeding plate is 0.32-0.40mm, and the distances between the cylinder and the four points of the cover plate of the carding machine are 0.19-0.21mm, 0.17-0.19 mm and 0.19-0.21 mm.

11. A method of making a moisture-absorbing, heat-insulating yarn as claimed in any one of claims 8 to 10, wherein: in the drawing process, the drafting multiple of the zone after primary drawing is 1.82-1.90 times, the drafting multiple of the zone after secondary drawing is 1.70-1.78 times, and the drafting multiple of the zone after tertiary drawing is 1.30-1.38 times.

12. A method of making a moisture-absorbing, heat-insulating yarn as claimed in any one of claims 8 to 10, wherein: the spinning process adopts compact siro spinning technology, the draft multiple of the rear zone is 1.13-1.23, the total draft multiple is 55-65, the speed of the front roller is 165-185r/min, and the rotating speed of the spindle is 13000-15000 r/min.