A multi-layer moisture-absorbing and warm-keeping velvet comfort layer and preparation method thereof

Abstract

The present invention relates to the technical field of layered products, specifically to a multi-layer moisture-absorbing and warm-keeping velvet comfort layer and a preparation method thereof, including forming a hemp fiber laminate; forming a hollow fiber laminate; placing the hollow fiber laminate on the hemp fiber laminate, performing a needle-punching treatment, melting in an oven, cooling and finalizing, to obtain a fiber composite layer composed of a hemp fiber composite layer and a hollow fiber composite layer; trimming the fiber composite layer and placing it in a rectangular enclosure, then pouring glue into the rectangular enclosure, and after the glue is evenly spread on the surface of the fiber composite layer, heating and curing, forming a high-elastic cotton layer on the surface of the fiber composite layer, taking out, fine trimming, and opening air holes, to obtain a moisture-absorbing and warm-keeping velvet comfort layer. The comfort layer in the present invention is a composite layered product composed of a hemp fiber composite layer, a hollow fiber composite layer and a high-elastic cotton layer, so that the comfort layer has good elasticity, excellent air permeability and warmth retention, and good antibacterial properties.

Description

Technical Field

[0001] The invention relates to the technical field of layered products, in particular to a multi-layer moisture-absorbing and warm-keeping velvet comfort layer and a preparation method thereof. Background Art

[0002] As the core board of the mattress, the comfort layer supports the human body, and the quality of the comfort layer directly affects the quality of the mattress. The high-elastic cotton comfort layer is environmentally friendly, non-toxic, anti-mite, anti-bacterial, and has good support and resilience. It can provide support according to the body curve, reduce discomfort at pressure points, and improve sleep comfort. However, its price is high, which is not conducive to widespread use. Hemp fiber is also environmentally friendly, and its source is wide and the price is usually low. Using hemp fiber to make a comfort layer can reduce production costs.

[0003] Although the hemp fiber comfort layer has low production cost and good air permeability, its fibrous structure makes its deformation and recovery poor, and its overall elasticity is not as good as that of high-elastic cotton pads. Moreover, after long-term use, the hemp fiber comfort layer will be deformed under the pressure of weight, shortening its lifespan. The deformed hemp fiber comfort layer will also affect the sleep quality. Based on this, a multi-layer moisture-absorbing and warm-keeping velvet comfort layer and a preparation method thereof are proposed. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a multi-layer moisture-absorbing and thermal-retaining velvet comfort layer and a preparation method thereof. The composite layer product composed of a hemp fiber composite layer, a hollow fiber composite layer and a high-elastic cotton layer makes the comfort layer have good elasticity, excellent air permeability and warmth retention, and good antibacterial properties.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multi-layer moisture-absorbing and heat-retaining velvet comfort layer, comprising a hemp fiber composite layer, a hollow fiber composite layer is provided on the hemp fiber composite layer, and a high-elastic cotton layer is provided on the hollow fiber composite layer; the hemp fiber composite layer is composed of antibacterial reinforced hemp fiber and low-melting-point fiber; the hollow fiber composite layer is composed of hollow fiber and low-melting-point fiber; the high-elastic cotton layer is penetrated by a plurality of groups of air holes.

[0006] Preferably, the thickness of the hemp fiber composite layer accounts for 60-70% of the total thickness of the comfort layer, the thickness of the hollow fiber composite layer accounts for 20-30% of the total thickness of the comfort layer, and the thickness of the high elastic cotton layer accounts for 10-20% of the total thickness of the comfort layer.

[0007] Preferably, the low melting point fiber is a high elastic 4080 fiber, and the hollow fiber is a polyester hollow fiber.

[0008] Preferably, by mass percentage, in the hemp fiber composite layer, the antibacterial reinforced hemp fiber accounts for 80-90%, and the low melting point fiber accounts for 10-20%; in the hollow fiber composite layer, the hollow fiber accounts for 75-85%, and the low melting point fiber accounts for 15-25%.

[0009] Preferably, the preparation method of the antibacterial reinforced hemp fiber is as follows: S1, fully soaking the hemp fiber in clean water, and then performing steam explosion treatment to obtain pretreated hemp fiber; S2, stirring and dissolving stearic acid and polyethylene glycol in propylene glycol to form a modified liquid, fully mixing the modified liquid with the pretreated hemp fiber, and continuing to perform steam explosion treatment, then rinsing with hot ethanol and clean water in turn, and naturally drying to obtain modified hemp fiber; S3, stirring nano zinc oxide, sodium dodecyl sulfate and deionized water to form an antibacterial liquid, spraying the antibacterial liquid evenly on the surface of the modified hemp fiber, and performing steam explosion treatment again, washing with water, and drying to obtain antibacterial reinforced hemp fiber.

[0010] Preferably, in step S2, the mass ratio of stearic acid, polyethylene glycol and glycerol is 3:1:20; and the mass ratio of the modified liquid to the pretreated hemp fiber is 1:4.

[0011] Preferably, in step S3, the mass ratio of the nano zinc oxide, sodium dodecyl sulfate and deionized water is 5:1:30; the mass ratio of the antibacterial liquid to the modified hemp fiber is 1:10.

[0012] The present invention also provides a method for preparing a multi-layer moisture-absorbing and heat-retaining velvet comfort layer, comprising the following steps:

[0013] (1) The antibacterial reinforced hemp fiber and the low melting point fiber are uniformly mixed, and after combing, web laying and needle punching, a hemp fiber laminate is formed;

[0014] (2) The hollow fibers and low-melting-point fibers are uniformly mixed, and after combing, web laying and needle punching, a hollow fiber stack is formed;

[0015] (3) placing the hollow fiber laminate on the hemp fiber laminate, performing a needle punching treatment, melting in an oven, and cooling and shaping to obtain a fiber composite layer consisting of a hemp fiber composite layer and a hollow fiber composite layer;

[0016] (4) The fiber composite layer is trimmed and placed in a rectangular enclosure, and then glue is poured into the rectangular enclosure. After the glue is evenly spread on the surface of the fiber composite layer, it is heated and cured to form a high-elastic cotton layer on the surface of the fiber composite layer. The layer is taken out, finely trimmed, and air holes are opened to obtain a moisture-absorbing and warm velvet comfort layer.

[0017] Preferably, in step (4), the preparation method of the mortar is as follows: weigh 70-80% natural latex, 20-25% nano zinc oxide, 1-2% sodium bicarbonate and 0.5-1% sulfur in percentage by mass, and stir them evenly to obtain the mortar.

[0018] Preferably, the water content of the natural latex is 50%.

[0019] The present invention provides a multi-layer moisture-absorbing and warm-keeping velvet comfort layer and a preparation method thereof, which has the following beneficial effects compared with the prior art:

[0020] The comfort layer in the present invention is a composite layer product composed of a hemp fiber composite layer, a hollow fiber composite layer and a high-elastic cotton layer, so that the comfort layer has good elasticity, excellent air permeability and warmth retention, and good antibacterial performance. Specifically, the top layer adopts a thinner microporous high-elastic cotton layer, which has good support and rebound effects, can well disperse the pressure, reduce the pressure on the fiber composite layer, and can effectively solve the problem of easy deformation of the fiber composite layer; the middle layer adopts a thinner hollow fiber composite layer, and the hollow structure makes it have good thermal insulation and moisture permeability; the bottom layer adopts a thicker hemp fiber composite layer with abundant sources, which has excellent air permeability while reducing the overall production cost of the comfort layer.

[0021] The present invention utilizes a rectangular enclosure to directly pour glue on the surface of the fiber composite layer, and directly forms a high-elastic cotton layer on the surface after heating and curing, abandoning the traditional method of using adhesives for bonding, thereby improving the air permeability of the comfort layer and avoiding the odor caused by the use of adhesives.

[0022] The present invention uses stearic acid and polyethylene glycol in combination, the carboxyl group of stearic acid undergoes an esterification reaction with the hydroxyl group on the fiber, and the terminal hydroxyl group of polyethylene glycol undergoes an etherification reaction with the alcohol hydroxyl group on the fiber, thereby giving the hemp fiber a certain thermoplasticity, and being more compatible with the 4080 fiber, enhancing its mechanical properties, and improving the original problem of poor elasticity and easy deformation of the hemp fiber.

[0023] The present invention adopts steam explosion to carry out plasticization modification and antibacterial modification treatment on hemp fiber, which is beneficial for the modification liquid or antibacterial liquid to penetrate into the interior of the fiber. This is because in a high-temperature and high-pressure steam environment, the pores inside the fiber are opened, which is beneficial for the entry of the modification liquid or antibacterial liquid, thereby increasing the load capacity and improving the thermoplasticity and antibacterial properties of the hemp fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1It is a schematic diagram of the structure of the moisture-absorbing and warmth-retaining tuft comfort layer of the present invention. DETAILED DESCRIPTION

[0026] The following examples are used to explain the implementation methods of the present application in detail, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0027] Example 1

[0028] The preparation method of antibacterial reinforced hemp fiber is as follows:

[0029] S1, soaking the hemp fiber in clean water, and then performing steam explosion treatment to obtain pretreated hemp fiber;

[0030] S2, dissolving stearic acid and polyethylene glycol in propylene glycol at a mass ratio of 3:1:20 to form a modified liquid, fully mixing the modified liquid with the pretreated hemp fiber at a mass ratio of 1:4, and continuing to perform steam explosion treatment, followed by washing with hot ethanol and clean water in turn, and drying naturally to obtain modified hemp fiber;

[0031] S3. Evenly stir nano zinc oxide, sodium dodecyl sulfate and deionized water in a mass ratio of 5:1:30 to form an antibacterial liquid, spray the antibacterial liquid evenly on the surface of the modified hemp fiber, control the mass ratio of the antibacterial liquid to the modified hemp fiber to be 1:10, perform steam explosion treatment again, wash with water, and dry to obtain the antibacterial reinforced hemp fiber.

[0032] Example 2

[0033] The preparation method of the mortar is as follows: by mass percentage, 77% of natural latex with a water content of 50%, 20% of nano zinc oxide, 2% of sodium bicarbonate and 1% of sulfur are weighed and stirred evenly to obtain the mortar.

[0034] Example 3

[0035] The preparation method of the mortar is as follows: by mass percentage, 73.5% of natural latex with a water content of 50%, 25% of nano zinc oxide, 1% of sodium bicarbonate and 0.5% of sulfur are weighed and stirred evenly to obtain the mortar.

[0036] Example 4

[0037] A method for preparing a multi-layer moisture-absorbing and heat-retaining velvet comfort layer comprises the following steps:

[0038] (1) The antibacterial reinforced hemp fiber and the high elastic 4080 low melting point fiber are uniformly mixed, and after combing, web laying and needle punching, a hemp fiber laminate is formed; in terms of mass percentage, the antibacterial reinforced hemp fiber accounts for 90% and the high elastic 4080 low melting point fiber accounts for 10% in the hemp fiber composite layer.

[0039] (2) The polyester hollow fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after combing, web laying and needle punching, a hollow fiber laminate is formed; in terms of mass percentage, the polyester hollow fiber accounts for 85% and the high-elastic 4080 low-melting-point fiber accounts for 15%.

[0040] (3) Placing the hollow fiber laminate on the hemp fiber laminate, performing a needle punching treatment, and then melting in an oven and cooling to set the laminate, thereby obtaining a fiber composite layer consisting of the hemp fiber composite layer and the hollow fiber composite layer.

[0041] (4) The fiber composite layer is trimmed and placed in a rectangular enclosure, and then glue is poured into the rectangular enclosure. After the glue is evenly spread on the surface of the fiber composite layer, it is heated and cured to form a high-elastic cotton layer on the surface of the fiber composite layer. The layer is taken out, finely trimmed, and air holes are opened to obtain a moisture-absorbing and warm velvet comfort layer.

[0042] In this embodiment, the antibacterial reinforced hemp fiber prepared in Example 1 and the glue prepared in Example 2 are used.

[0043] In this embodiment, the prepared moisture-absorbing and warm-keeping velvet comfort layer comprises, from top to bottom, a high-elastic cotton layer with air holes, a hollow fiber composite layer, and a hemp fiber composite layer.

[0044] The thickness of the hemp fiber composite layer accounts for 60% of the total thickness of the comfort layer, the thickness of the hollow fiber composite layer accounts for 20% of the total thickness of the comfort layer, and the thickness of the high elastic cotton layer accounts for 20% of the total thickness of the comfort layer.

[0045] Example 5

[0046] A method for preparing a multi-layer moisture-absorbing and heat-retaining velvet comfort layer comprises the following steps:

[0047] (1) The antibacterial reinforced hemp fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after being combed, laid and needled, a hemp fiber laminate is formed; in terms of mass percentage, the antibacterial reinforced hemp fiber accounts for 80% and the high-elastic 4080 low-melting-point fiber accounts for 20% in the hemp fiber composite layer.

[0048] (2) The polyester hollow fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after combing, web laying and needle punching, a hollow fiber laminate is formed; in terms of mass percentage, the polyester hollow fiber accounts for 75% and the high-elastic 4080 low-melting-point fiber accounts for 25%.

[0049] (3) Placing the hollow fiber laminate on the hemp fiber laminate, performing a needle punching treatment, and then melting in an oven and cooling to set the laminate, thereby obtaining a fiber composite layer consisting of the hemp fiber composite layer and the hollow fiber composite layer.

[0050] (4) The fiber composite layer is trimmed and placed in a rectangular enclosure, and then glue is poured into the rectangular enclosure. After the glue is evenly spread on the surface of the fiber composite layer, it is heated and cured to form a high-elastic cotton layer on the surface of the fiber composite layer. The layer is taken out, finely trimmed, and air holes are opened to obtain a moisture-absorbing and warm velvet comfort layer.

[0051] In this embodiment, the antibacterial reinforced hemp fiber prepared in Example 1 and the glue prepared in Example 3 are used.

[0052] In this embodiment, the prepared moisture-absorbing and warm-keeping velvet comfort layer comprises, from top to bottom, a high-elastic cotton layer with air holes, a hollow fiber composite layer, and a hemp fiber composite layer.

[0053] The thickness of the hemp fiber composite layer accounts for 70% of the total thickness of the comfort layer, the thickness of the hollow fiber composite layer accounts for 20% of the total thickness of the comfort layer, and the thickness of the high elastic cotton layer accounts for 10% of the total thickness of the comfort layer.

[0054] Example 6

[0055] A method for preparing a multi-layer moisture-absorbing and heat-retaining velvet comfort layer comprises the following steps:

[0056] (1) The antibacterial reinforced hemp fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after combing, web laying and needle punching, a hemp fiber laminate is formed; in terms of mass percentage, the antibacterial reinforced hemp fiber accounts for 85% and the high-elastic 4080 low-melting-point fiber accounts for 15% in the hemp fiber composite layer.

[0057] (2) The polyester hollow fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after combing, web laying and needle punching, a hollow fiber laminate is formed; in terms of mass percentage, the polyester hollow fiber accounts for 80% and the high-elastic 4080 low-melting-point fiber accounts for 20%.

[0058] (3) Placing the hollow fiber laminate on the hemp fiber laminate, performing a needle punching treatment, and then melting in an oven and cooling to set the laminate, thereby obtaining a fiber composite layer consisting of the hemp fiber composite layer and the hollow fiber composite layer.

[0059] (4) The fiber composite layer is trimmed and placed in a rectangular enclosure, and then glue is poured into the rectangular enclosure. After the glue is evenly spread on the surface of the fiber composite layer, it is heated and cured to form a high-elastic cotton layer on the surface of the fiber composite layer. The layer is taken out, finely trimmed, and air holes are opened to obtain a moisture-absorbing and warm velvet comfort layer.

[0060] In this embodiment, the antibacterial reinforced hemp fiber prepared in Example 1 and the glue prepared in Example 2 are used.

[0061] In this embodiment, the prepared moisture-absorbing and warm-keeping velvet comfort layer comprises, from top to bottom, a high-elastic cotton layer with air holes, a hollow fiber composite layer, and a hemp fiber composite layer.

[0062] The thickness of the hemp fiber composite layer accounts for 65% of the total thickness of the comfort layer, the thickness of the hollow fiber composite layer accounts for 20% of the total thickness of the comfort layer, and the thickness of the high elastic cotton layer accounts for 15% of the total thickness of the comfort layer.

[0063] Comparative Example 1

[0064] The method is basically the same as Example 6, except that the antibacterial reinforced hemp fiber is replaced by the dried pretreated hemp fiber.

[0065] Comparative Example 2

[0066] The method is basically the same as Example 6, except that the antibacterial reinforced hemp fiber is replaced by the dried modified hemp fiber.

[0067] Comparative Example 3

[0068] The same as Example 6, except that the antibacterial reinforced hemp fiber is replaced with the antibacterial hemp fiber. The preparation method of the antibacterial hemp fiber is as follows:

[0069] S1, soaking the hemp fiber in clean water, and then performing steam explosion treatment to obtain pretreated hemp fiber;

[0070] S2. Nano zinc oxide, sodium dodecyl sulfate and deionized water are stirred evenly at a mass ratio of 5:1:30 to form an antibacterial liquid, and the antibacterial liquid is sprayed evenly on the surface of the pretreated hemp fiber. The mass ratio of the antibacterial liquid to the pretreated hemp fiber is controlled to be 1:10, and the fiber is subjected to steam explosion treatment again. After washing and drying, the antibacterial hemp fiber is obtained.

[0071] Comparative Example 4

[0072] The method is basically the same as Example 6, except that: the preparation method of the antibacterial reinforced hemp fiber is as follows:

[0073] S1, soaking the hemp fiber in clean water, and then performing steam explosion treatment to obtain pretreated hemp fiber;

[0074] S2, dissolving stearic acid and polyethylene glycol in glycerol at a mass ratio of 3:1:20 to form a modified liquid, fully mixing the modified liquid with the pretreated hemp fiber at a mass ratio of 1:4, centrifuging, then washing with hot ethanol and water in turn, and drying naturally to obtain modified hemp fiber;

[0075] S3. Evenly stir nano zinc oxide, sodium dodecyl sulfate and deionized water in a mass ratio of 5:1:30 to form an antibacterial liquid, spray the antibacterial liquid evenly on the surface of the modified hemp fiber, control the mass ratio of the antibacterial liquid to the modified hemp fiber to be 1:10, and obtain the antibacterial reinforced hemp fiber after washing and drying.

[0076] Comparative Example 5

[0077] A method for preparing a multi-layer moisture-absorbing and heat-retaining velvet comfort layer comprises the following steps:

[0078] (1) The antibacterial reinforced hemp fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after combing, web laying and needle punching, a hemp fiber laminate is formed; in terms of mass percentage, the antibacterial reinforced hemp fiber accounts for 85% and the high-elastic 4080 low-melting-point fiber accounts for 15% in the hemp fiber composite layer.

[0079] (2) The polyester hollow fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after combing, web laying and needle punching, a hollow fiber laminate is formed; in terms of mass percentage, the polyester hollow fiber accounts for 80% and the high-elastic 4080 low-melting-point fiber accounts for 20%.

[0080] (3) Placing the hollow fiber laminate on the hemp fiber laminate, performing a needle punching treatment, and then melting in an oven and cooling to set the laminate, thereby obtaining a fiber composite layer consisting of the hemp fiber composite layer and the hollow fiber composite layer.

[0081] (4) Pour the glue into a rectangular enclosure, heat and cure it, and then take it out and finely trim it to obtain a high-elastic cotton layer.

[0082] (5) The high-elastic cotton layer and the fiber composite layer are bonded by a polyurethane adhesive, and after drying and curing, air holes are opened to obtain a moisture-absorbing and warm velvet comfort layer.

[0083] In this embodiment, the antibacterial reinforced hemp fiber prepared in Example 1 and the glue prepared in Example 2 are used.

[0084] In this embodiment, the prepared moisture-absorbing and warm-keeping velvet comfort layer comprises, from top to bottom, a high-elastic cotton layer with air holes, a hollow fiber composite layer, and a hemp fiber composite layer.

[0085] The thickness of the hemp fiber composite layer accounts for 65% of the total thickness of the comfort layer, the thickness of the hollow fiber composite layer accounts for 20% of the total thickness of the comfort layer, and the thickness of the high elastic cotton layer accounts for 15% of the total thickness of the comfort layer.

[0086] Quality Inspection

[0087] 1. The moisture-absorbing and warm-keeping tuft comfort layers in Examples 4-6 and Comparative Examples 1-5 were used as test objects. The air permeability was measured with reference to the standard of GB / T24218.15-2018; the thermal resistance was measured with reference to the standard of GB / T11048-2018. The specific test results are shown in the following table.

[0088] Table 1 Air permeability and thermal resistance

[0089]

[0090] From the above table, we can see that:

[0091] (1) Compared with Example 6, the fibers in Comparative Example 4 were not subjected to steam explosion treatment during plasticization and antibacterial modification, and the resulting comfort layer had poor air permeability and thermal insulation properties.

[0092] (2) Compared with Example 6, in Comparative Example 5, the high-elastic cotton layer and the fiber composite layer are bonded by a polyurethane adhesive. After curing, the polyurethane adhesive has good density and is not easy to pass water vapor. It can only be ventilated through the air holes on the high-elastic cotton layer, resulting in poor air permeability. However, its thermal insulation performance is basically the same as that of Example 4.

[0093] 2. The moisture-absorbing and warming tuft comfort layers in Example 6 and Comparative Examples 1 and 4 were used as test objects. The antibacterial properties were tested with reference to the standard of GB / T20944.3-2008. The specific test results are shown in the following table.

[0094] Table 2 Antibacterial properties

[0095]

[0096] From the above table, we can see that:

[0097] (1) Compared with Example 6, the pretreated hemp fiber used in Comparative Example 1 was not modified with an antibacterial liquid, resulting in a deviation in the antibacterial effect of the comfort layer.

[0098] (2) Compared with Example 6, the hemp fiber in Comparative Example 4 was not subjected to steam explosion treatment during the antibacterial modification treatment. The pores in the hemp fiber were in a blocked state, and the nano-oxidizing agent had a general bonding effect with the hemp fiber matrix and was easily washed away in subsequent treatments, thereby reducing the loading rate of the nano-oxidizing agent and affecting the antibacterial properties of the comfort layer.

[0099] 3. The fiber composite layers in Example 6 and Comparative Examples 1, 3 and 4 were used as test objects. The bending properties were tested with reference to the standard of GB / T17657-2022. The specific test results are shown in the following table.

[0100] Table 3 Flexibility

[0101]

[0102] From the above table, we can see that:

[0103] (1) Compared with Example 6, the hemp fibers in Comparative Examples 1 and 3 were not plasticized and modified, resulting in a decrease in the bending properties of the fiber composite layer.

[0104] (2) Compared with Example 6, the hemp fiber in Comparative Example 4 was not treated by steam explosion during plasticization modification, resulting in a poor plasticization effect, which in turn affected the bending properties of the fiber composite layer.

[0105] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-layer moisture-absorbing and heat-retaining velvet comfort layer, characterized in that: It comprises a hemp fiber composite layer, a hollow fiber composite layer is arranged on the hemp fiber composite layer, and a high elastic cotton layer is arranged on the hollow fiber composite layer; The hemp fiber composite layer is composed of antibacterial reinforced hemp fiber and low melting point fiber; The hollow fiber composite layer is composed of hollow fibers and low melting point fibers; The high-elastic cotton layer is provided with a plurality of groups of ventilation holes; The preparation method of the antibacterial reinforced hemp fiber is as follows: S1, soaking the hemp fiber in clean water, and then performing steam explosion treatment to obtain pretreated hemp fiber; S2, stirring and dissolving stearic acid and polyethylene glycol in glycerol to form a modified liquid, fully mixing the modified liquid with the pretreated hemp fiber, and continuing to perform steam explosion treatment, and then washing with hot ethanol and clean water in sequence, and drying naturally to obtain modified hemp fiber; S3, mixing nano zinc oxide, sodium dodecyl sulfate and deionized water to form an antibacterial liquid, spraying the antibacterial liquid evenly on the surface of the modified hemp fiber, and performing steam explosion treatment again, washing and drying, to obtain antibacterial reinforced hemp fiber; The preparation method of the multi-layer moisture-absorbing and heat-retaining velvet comfort layer comprises the following steps: (1) The antibacterial reinforced hemp fiber and the low melting point fiber are uniformly mixed, and after combing, web laying and needle punching, a hemp fiber laminate is formed; (2) The hollow fibers and low-melting-point fibers are uniformly mixed, and after combing, web laying and needle punching, a hollow fiber stack is formed; (3) placing the hollow fiber laminate on the hemp fiber laminate, performing a needle punching treatment, melting in an oven, and cooling and shaping to obtain a fiber composite layer consisting of a hemp fiber composite layer and a hollow fiber composite layer; (4) The fiber composite layer is trimmed and placed in a rectangular enclosure, and then glue is poured into the rectangular enclosure. After the glue is evenly spread on the surface of the fiber composite layer, it is heated and cured to form a high-elastic cotton layer on the surface of the fiber composite layer. The layer is taken out, finely trimmed, and air holes are opened to obtain a moisture-absorbing and warm velvet comfort layer.

2. A multi-layer moisture-absorbing and warm-keeping fleece comfort layer according to claim 1, characterized in that: The thickness of the hemp fiber composite layer accounts for 60-70% of the total thickness of the comfort layer, the thickness of the hollow fiber composite layer accounts for 20-30% of the total thickness of the comfort layer, and the thickness of the high elastic cotton layer accounts for 10-20% of the total thickness of the comfort layer.

3. The multi-layer moisture-absorbing and warm-keeping fleece comfort layer according to claim 1, characterized in that: The low melting point fiber is a high elastic 4080 fiber, and the hollow fiber is a polyester hollow fiber.

4. The multi-layer moisture-absorbing and heat-retaining fleece comfort layer according to claim 1, characterized in that: In terms of mass percentage, in the hemp fiber composite layer, the antibacterial reinforced hemp fiber accounts for 80-90% and the low melting point fiber accounts for 10-20%; In the hollow fiber composite layer, the hollow fibers account for 75-85% and the low-melting-point fibers account for 15-25%.

5. The multi-layer moisture-absorbing and heat-retaining fleece comfort layer according to claim 1, characterized in that: In step S2, the mass ratio of stearic acid, polyethylene glycol and glycerol is 3:1:20; the mass ratio of the modified liquid to the pretreated hemp fiber is 1:

4.

6. The multi-layer moisture-absorbing and heat-retaining fleece comfort layer according to claim 1, characterized in that: In step S3, the mass ratio of the nano zinc oxide, sodium dodecyl sulfate and deionized water is 5:1:30; the mass ratio of the antibacterial liquid to the modified hemp fiber is 1:

10.

7. The method for preparing a multi-layer moisture-absorbing and warming tuft comfort layer according to claim 1, characterized in that: In step (4), the preparation method of the mortar is as follows: weigh 70-80% of natural latex, 20-25% of nano zinc oxide, 1-2% of sodium bicarbonate and 0.5-1% of sulfur in terms of mass percentage, and stir them evenly to obtain the mortar.

8. The method for preparing a multi-layer moisture-absorbing and heat-retaining terry comfort layer according to claim 7, characterized in that: The water content of the natural latex is 50%.

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