CN118716817A - A moisture-absorbing and breathable bamboo fiber quilt core and preparation method thereof - Google Patents

Abstract

The present invention discloses a moisture-absorbing and breathable bamboo fiber quilt core and a preparation method thereof. The bamboo fiber quilt core comprises a quilt core cover and a quilt core filler filled in the quilt core cover; the main components of the quilt core filler are bamboo-plastic composite fiber and cotton fiber; the raw materials of the bamboo-plastic composite fiber include: bamboo fiber, modified polymer, buffer, dispersant, deionized water and ethanol; the raw materials of the modified polymer include acrylamide monomers with phenolic hydroxyl groups. The bamboo fiber quilt core obtained by the preparation method of the moisture-absorbing and breathable bamboo fiber quilt core of the present invention can increase the moisture absorption and breathability of the bamboo fiber, and can maintain good moisture absorption and breathability effects under the conditions of multiple washings and sun exposure.

Description

A moisture-absorbing and breathable bamboo fiber quilt core and preparation method thereof

Technical Field

The invention relates to the technical field of artificial spinning fibers, in particular to a moisture-absorbing and breathable bamboo fiber quilt core and a preparation method thereof.

Background Art

With the development of science and technology and the improvement of people's living standards, "healthy sleep" has now become a life concept advocated by society. Due to the fast pace of life and high pressure of people in today's society, sleep quality is a necessary guarantee for providing sufficient energy for the day, and people's demand for various special functional textiles is increasing.

In order to improve people's sleep quality, more and more textiles made of plant fibers are emerging. At present, quilt cores based on modified bamboo fibers are attracting more and more attention. Because bamboo fibers have good hygroscopicity, soft hand feel and comfortable touch, the fabrics made of them are comfortable, smooth, breathable and drapey. In addition, bamboo fibers can be spun pure or blended or interwoven with cotton, wool, silk, linen, chemical fiber and other fibers, and have very good spinnability, further improving its wide range of applications.

At present, as the moisture absorption and breathability of natural bamboo fibers will begin to decrease over time, in order to improve the functionality of textile fiber quilts, bamboo fibers are modified into bamboo-plastic composite fibers to improve their moisture absorption and breathability effects.

However, since a large number of hydrophilic groups on the surface of cellulose and hemicellulose give the natural fiber a hydrophilic nature, and since the abundant non-polar groups on the surface of the polymer give the polymer a strong hydrophobic property, the prepared bamboo-plastic composite fiber is affected by the poor interface compatibility inside, so that the bamboo-plastic composite fiber often exhibits poor mechanical properties, affecting the service life of the textile fiber. The present application provides a solution that can increase the moisture absorption and air permeability of bamboo fiber and can maintain the moisture absorption and air permeability effect of the quilt core for a long time.

Summary of the invention

The present application provides a moisture-absorbing and breathable bamboo fiber quilt core and a preparation method thereof, which can increase the moisture absorption and breathability of the bamboo fiber, and at the same time maintain good moisture absorption and breathability effects even after multiple washings and exposure to the sun.

On the one hand, the present application provides a moisture-absorbing and breathable bamboo fiber quilt core, comprising a quilt core cover and a quilt core filler filled in the quilt core cover; the quilt core filler mainly comprises bamboo-plastic composite fiber and cotton fiber; the raw materials of the bamboo-plastic composite fiber include: bamboo fiber, modified polymer, buffer solution, dispersant, deionized water and ethanol; the raw materials of the modified polymer include acrylamide monomer having phenolic hydroxyl group.

By adopting the above technical scheme, the present application adopts acrylamide monomers with phenolic hydroxyl groups to polymerize into modified polymers as the modification of bamboo-plastic composite fibers. Since the phenolic hydroxyl groups can be loaded onto the surface of bamboo fibers in the form of hydrogen bonding, the process of modifying bamboo fibers is gentle, and the structure of bamboo fibers themselves will not be damaged, so that the inherent characteristics of bamboo fibers are well preserved. The polarity of the surface of bamboo fibers is reduced by the reaction, which helps to improve the compatibility of polymers with bamboo fibers, and is conducive to strengthening the mechanical interlocking effect between bamboo fibers and modified polymers, thereby increasing the moisture absorption and air permeability of bamboo fibers, and maintaining the moisture absorption and air permeability of the quilt core for a long time.

Preferably, the acrylamide monomers having phenolic hydroxyl groups include N-(2,5-dihydroxy-4-acrylamidemethylbenzyl)acrylamide, N-(3,4-dihydroxy-6-acrylamidemethylbenzyl)acrylamide, N-(2,3,4-trihydroxy-5-acrylamidemethylbenzyl)acrylamide and N-(2,4-dihydroxy-5-acrylamidemethylbenzyl)acrylamide.

Preferably, each of the acrylamide monomers having a phenolic hydroxyl group is synthesized by respectively synthesizing catechol, hydroquinone, resorcinol and pyrogallol with N-methylacetamide.

By adopting the above technical solution, since the hydroxyl group on the phenolic hydroxyl group has good adhesion and reduction properties, the acrylamide monomer with phenolic hydroxyl group is generally used in current antifouling coatings, and is now also used in the field of antibacterial coatings. The present application is directed to connecting the hydroxyl group on the phenolic hydroxyl group with the hydroxyl group on the surface of the bamboo fiber through hydrogen bonds, making the process of modifying the bamboo fiber gentle and preserving the inherent properties of the bamboo fiber.

Preferably, the initiator for polymerizing the acrylamide monomer having a phenolic hydroxyl group into the modified polymer is azobisisoheptonitrile.

By adopting the above technical solution, the present application uses azobisisoheptylnitrile to polymerize acrylamide monomers having phenolic hydroxyl groups, thereby making the hydroxyl groups of the polymer evenly distributed, which is helpful for fixation on the surface of bamboo fiber.

Preferably, the buffer is one of TBE buffer, TAE buffer and MOPS buffer.

By adopting the above technical solution, TBE buffer, TAE buffer and MOPS buffer are widely used in the fields of molecular biology, protein analysis, cell culture, etc. In order to enable the hydroxyl groups on the modified polymer to be loaded on the surface of bamboo fiber through hydrogen bonds, the pH value in the solution is stabilized by the buffer. In addition, TBE buffer, TAE buffer and MOPS buffer are all weakly alkaline, which helps the modified polymer to be loaded on the surface of bamboo fiber in a weakly alkaline environment.

Preferably, the dispersant includes one or more of polyethylene, polypropylene, ethylene-acrylic acid copolymer, and ethylene-vinyl acetate copolymer.

On the other hand, the present application provides a method for preparing a moisture-absorbing and breathable bamboo fiber quilt core, comprising the following steps: S1, preparation of acrylamide monomer: adding catechol, hydroquinone, resorcinol and pyrogallol to anhydrous ethanol in a molar ratio of 2:1, respectively, and performing ultrasonic treatment until the raw materials are completely dissolved, performing mechanical stirring at 25°C-45°C, setting the speed to 500rpm-1000rpm, and slowly adding a certain amount of concentrated sulfuric acid, waiting for 72-1 44h, stop stirring, wait for precipitation for 12-36h, and filter, remove the filtrate, wash with ion water for 3-5 times until the pH of the removed filtrate is 7, and then recrystallize the acrylamide monomer to obtain an acrylamide monomer with phenolic hydroxyl groups; S2, preparation of modified polymer: mix the acrylamide monomer with phenolic hydroxyl groups with anhydrous ethanol in proportion, control the temperature at 60°C-80°C, dissolve it by ultrasonic treatment, cool it to 20°C-30°C, add initiator azobisisoheptonitrile, The mixture was then subjected to ultrasonic treatment and dissolved, and finally heated to 60-80°C for precipitation polymerization, and the temperature was kept constant for 8-12 hours, and centrifuged for 0.5-1 hour at a speed of 5000-8000 rpm, and finally washed three times with anhydrous ethanol to obtain a modified polymer; S3, pretreatment of bamboo fiber: natural raw bamboo was split into bamboo slices and crushed into bamboo filaments, and then immersed in a mixed solution of deionized water and anhydrous ethanol with a volume ratio of 50% for washing 3-5 times; the cleaned bamboo filaments were then immersed in a solution containing raw bamboo slices and crushed into bamboo filaments; S4, preparation of bamboo-plastic composite fiber: dissolving the modified polymer in deionized water, adding the pretreated bamboo fiber in proportion, adding a certain amount of buffer and dispersant, controlling the pH value between 8 and 9, and stirring the mixed solution at a speed of 4000 rpm-6000 rpm for 18 h-28 h at a certain temperature, and washing with deionized water to obtain bamboo-plastic composite fiber.

Preferably, the preparation method of the quilt core filling is as follows: the bamboo-plastic composite fiber and cotton fiber are wound, stretched, and combed, and the bamboo fiber quilt core cover is cut into a required size and sewn into a quilt cover with an open end, and the quilt core filling is put into the bamboo fiber quilt core cover, and sewn with a quilting line to obtain a bamboo fiber quilt core.

One or more technical solutions provided in this application have at least the following technical effects or advantages:

1. The present application adopts acrylamide monomers with phenolic hydroxyl groups to polymerize into modified polymers as the modification of bamboo-plastic composite fibers. The phenolic hydroxyl groups can be loaded onto the surface of bamboo fibers through hydrogen bonding, thereby making the process of modifying bamboo fibers gentle and not damaging the structure of bamboo fibers themselves, thereby preserving the inherent properties of bamboo fibers intact, thereby increasing the moisture absorption and breathability of bamboo fibers and maintaining the moisture absorption and breathability of the quilt core for a long time.

2. The present application uses azobisisoheptylnitrile to polymerize acrylamide monomers having phenolic hydroxyl groups, thereby making the hydroxyl groups of the polymer evenly distributed, which helps to fix it on the surface of bamboo fiber.

3. The present application stabilizes the pH value in the solution by TBE buffer, TAE buffer and MOPS buffer, thereby making the TBE buffer, TAE buffer and MOPS buffer keep the solution in a weak alkaline state, thereby facilitating the loading of the modified polymer on the surface of the bamboo fiber under a weak alkaline environment.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a synthesis reaction formula of N-(3,4-dihydroxy-6-acrylamidemethylbenzyl)acrylamide in which the acrylamide monomer is Example 1 of the present application;

FIG2 is a synthesis reaction formula of N-(2,5-dihydroxy-4-acrylamidemethylbenzyl)acrylamide, in which the acrylamide monomer is Example 2 of the present application;

FIG3 is a synthesis reaction formula of N-(2,4-dihydroxy-5-acrylamidemethylbenzyl)acrylamide, in which the acrylamide monomer is Example 3 of the present application;

FIG. 4 is a synthesis reaction formula of N-(2,3,4-trihydroxy-5-acrylamidemethylbenzyl)acrylamide, the acrylamide monomer in Example 4 of the present application.

DETAILED DESCRIPTION

The present application provides a moisture-absorbing and breathable bamboo fiber quilt core and a preparation method thereof, which can increase the moisture absorption and breathability of the bamboo fiber, and at the same time maintain good moisture absorption and breathability effects even after multiple washings and exposure to the sun.

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or modules that are not explicitly listed or inherent to these processes, methods, products or devices.

raw material

Bamboo fiber: The bamboo fiber currently available on the market is used. The bamboo fiber used in this application is a pure natural original bamboo fiber directly separated from the moso bamboo by physical or mechanical methods to remove impurities such as lignin, polypentose, bamboo powder, pectin, etc.

Catechol CAS: 120-80-9 Molecular weight: 110.111 Purity: 99.5%

Hydroquinone CAS: 123-31-9 Molecular weight: 110.111 Purity: 99.5%

Resorcinol CAS: 108-46-3 Molecular weight: 110.111 Purity: 99.5%

Pyrogallol (1,2,3-pyrogallol) CAS: 87-66-1 Molecular weight: 126.110 Purity: 99.5%

N-Methylacetamide CAS: 79-16-3 Molecular weight: 73.094 Purity: 99.5%

2-Azobis(2-isoheptanonitrile) CAS: 4419-11-8 Molecular weight: 248.367 Purity: 99.5%

Polyethylene CAS: 9002-88-4 Molecular weight: N/A Purity: 99.5%

Polypropylene CAS: 9003-07-0 Molecular weight: N/A Purity: 99.5%

Ethylene-acrylic acid copolymer CAS: 25749-98-8 Molecular weight: N/A Purity: 99.5%

Ethylene-vinyl acetate copolymer CAS: 24937-78-8 Molecular weight: N/ Purity: 99.5%

TBE buffer: Dissolve 0.045 mol/L Tris-boric acid and 0.001 mol/L EDTA in sterile water and mix well to a solution volume of 1 L.

TAE buffer: Dissolve 0.095 mol/L Tris-boric acid and 0.001 mol/L EDTA in sterile water and mix well to a solution volume of 1 L.

MOPS buffer: 0.020 mol/L 3-morpholinepropanesulfonic acid, 0.002 mol/L sodium acetate and 0.001 mol/L ETA were dissolved and mixed with sterile water to a solution volume of 1 L.

Raw material example

Preparation of N-(3,4-dihydroxy-6-acrylamidemethylbenzyl)acrylamide:

Catechol and N-methylacetamide are added to anhydrous ethanol in a molar ratio of 2:1, and ultrasonic treatment is performed respectively until the raw materials are completely dissolved, mechanical stirring is performed at 25°C, the speed is set to 500 rpm, and concentrated sulfuric acid with a weight ratio of 2% to 3% of the mixed solution is slowly added, and waiting is performed for 72 hours. After stopping stirring, waiting for precipitation for 12 hours, and filtering is performed. After removing the filtrate, washing with ionized water is repeated 3 times until the pH of the removed filtrate is 7, and then the acrylamide monomer is recrystallized to obtain N-(3,4-dihydroxy-6-acrylamidemethylbenzyl)acrylamide.

Preparation of N-(2,5-dihydroxy-4-acrylamidemethylbenzyl)acrylamide:

Hydroquinone and N-methylacetamide are added to anhydrous ethanol in a molar ratio of 2:1, and ultrasonic treatment is performed respectively until the raw materials are completely dissolved, mechanical stirring is performed at 25°C, the speed is set to 500 rpm, and concentrated sulfuric acid with a weight ratio of 2% to 3% of the mixed solution is slowly added, and waiting is performed for 72 hours. After stopping stirring, waiting for precipitation for 12 hours, and filtering is performed. After removing the filtrate, washing with ionized water is repeated 3 times until the pH of the removed filtrate is 7, and then the acrylamide monomer is recrystallized to obtain N-(2,5-dihydroxy-4-acrylamidomethylbenzyl) acrylamide.

Preparation of N-(2,4-dihydroxy-5-acrylamidomethylbenzyl)acrylamide:

Resorcinol and N-methylacetamide are added to anhydrous ethanol in a molar ratio of 2:1, and ultrasonic treatment is performed respectively until the raw materials are completely dissolved, mechanical stirring is performed at 25°C, the speed is set to 500 rpm, and concentrated sulfuric acid with a weight ratio of 2% to 3% of the mixed solution is slowly added, and waiting is performed for 72 hours. After stopping stirring, waiting for precipitation for 12 hours, and suction filtration is performed. After removing the filtrate, washing with ionized water is repeated 3 times until the pH of the removed filtrate is 7, and then the acrylamide monomer is recrystallized to obtain N-(2,4-dihydroxy-5-acrylamidomethylbenzyl) acrylamide.

Preparation of N-(2,3,4-trihydroxy-5-acrylamidomethylbenzyl)acrylamide

Pyrogallol and N-methylacetamide are added to anhydrous ethanol in a molar ratio of 2:1, and ultrasonic treatment is performed respectively until the raw materials are completely dissolved, mechanical stirring is performed at 25°C, the speed is set to 500 rpm, and concentrated sulfuric acid with a weight ratio of 2% to 3% of the mixed solution is slowly added, and waiting is performed for 72 hours. After stopping stirring, waiting for precipitation for 12 hours, and filtering is performed. After removing the filtrate, washing with ionized water is repeated 3 times until the pH of the removed filtrate is 7, and then the acrylamide monomer is recrystallized to obtain N-(2,3,4.trihydroxy-5-acrylamidemethylbenzyl)acrylamide.

Example

Example 1

S1. Preparation of modified polymer: 10 g of N-(3,4-dihydroxy-6-acrylamidomethylbenzyl)acrylamide was mixed with 200 ml of anhydrous ethanol, the temperature was controlled at 80° C., and the mixture was dissolved by ultrasonic treatment. After cooling to 20° C., an initiator azobisisoheptanenitrile was added, and ultrasonic treatment was continued to dissolve the mixture. Finally, the mixture was heated to 80° C. for precipitation polymerization, and the temperature was maintained for 8 h. The mixture was centrifugally stirred for 1 h at a speed of 5000 rpm, and washed three times with anhydrous ethanol to obtain a modified polymer.

S2. Pretreatment of bamboo fibers: immersing the treated bamboo fibers in a mixed solution of deionized water and anhydrous ethanol with a volume ratio of 50% for washing three times; then immersing the cleaned bamboo fibers in a solution containing a biological enzyme for 6 hours, and then washing, loosening, and combing the bamboo fibers after enzyme decomposition to obtain bamboo fibers;

S4. Preparation of bamboo-plastic composite fiber: 10 g of modified polymer was dissolved in 1 L of deionized water, and 20 g of pretreated bamboo fiber was added, and 2 g of TBE buffer and 3 g of polyethylene were added at the same time. The pH was controlled at 8, and the mixed solution was stirred at a speed of 4000 rpm for 18 h at a certain temperature, and washed with deionized water to obtain bamboo-plastic composite fiber.

S5. Weaving of bamboo fiber inner core: winding bamboo-plastic composite fiber and cotton fiber, and then making quilt core filling by stretching and combing; cutting the quilt core cover into a certain size, sewing an opening, adding the quilt core filling into the quilt core cover, and obtaining the bamboo fiber inner core.

Embodiment 2-4

The difference between Example 2 and Example 1 is that the modified polymer is synthesized by polymerization of N-(2,5-dihydroxy-4-acrylamidomethylbenzyl)acrylamide.

The difference between Example 3 and Example 1 is that the modified polymer is synthesized by polymerization of N-(2,4-dihydroxy-5-acrylamidomethylbenzyl)acrylamide.

The difference between Example 4 and Example 1 is that the modified polymer is synthesized by polymerization of N-(2,3,4-trihydroxy-5-acrylamidemethylbenzyl)acrylamide.

Comparative Example

Comparative Example 1-2

The difference between Comparative Example 1 and Example 1 is that commercially available bamboo raw fibers for making bamboo fiber quilt cores are used, and the quilt core filling is obtained by winding the bamboo raw fibers with cotton fibers, and then stretching and combing.

The difference between Comparative Example 2 and Example 1 is that the bamboo fibers are modified by using thermoplastic water-based polyurethane which is widely available on the market.

Performance testing

In order to further study the effects of various components and preparation parameters on the moisture-absorbing and breathable bamboo fiber quilt core, the present application further carries out the following examples for verification.

According to Examples 1-4 and Comparative Examples 1-2, the bamboo fiber quilt cores prepared in the Examples and Comparative Examples were tested for their moisture absorption, air permeability and warmth retention properties after multiple washings and sun exposure.

Specifically, the composite fiber core was divided into two groups for experiments, one of which was set as Group A, and its moisture absorption, breathability and thermal insulation properties were observed after multiple washes; the other group was set as Group B, and its moisture absorption, breathability and thermal insulation properties were observed after multiple sun exposures.

The A group was washed according to the method in GB/T8629-2017 "Household Washing and Drying Procedure for Textile Testing", with a washing degree of 5N, and washed 0, 20, 50, and 100 times respectively. The washed composite fiber inner core was dried and placed in an environment of 20°C and 70% relative humidity for 24 hours. The B group was covered with an inner core cover on the outside and placed in an environment of 30°C and 55% relative humidity, and exposed to the sun for a total of 0h, 6h, 36h, and 120h. The moisture absorption, breathability, and contact warmth of the bamboo fiber quilt cores of the A and B groups were tested respectively.

1. Air permeability test: With reference to the national standard "GB/T 5453-1997", the sample pressure difference is 150Pa. Under constant temperature and humidity conditions of 25°C and 60% humidity, the air permeability of the bamboo fiber quilt cores of Examples 1-4 and Comparative Examples 1-2 is tested using a fully automatic air permeability tester.

2. Thermal insulation performance test: The test is carried out in accordance with GB/T11048-2009 "Test method for thermal insulation performance of textiles". The flat-plate constant temperature difference heat dissipation method is adopted to calculate the percentage of the difference between the heat dissipation when there is no sample and the heat dissipation when there is a sample and the ratio of the heat dissipation when there is no sample.

Table 1, Performance test table of Examples 1-4 and Comparative Examples 1-2

Thermal insulation performance test: unit is H insulation rate/%

Air permeability test: The unit is K air permeability/(mm/s)

Conclusion Analysis

According to the above test, the air permeability and thermal insulation performance of the bamboo fiber quilt core prepared in Examples 1-4 and Comparative Examples 1-2 after multiple washings are analyzed. Among them, compared with the comparison between Comparative Example 1 and Examples 1-4, Comparative Example 1 uses a quilt core filling material made by winding, stretching and combing commercially available bamboo fibers and cotton fibers, and the air permeability and thermal insulation performance of the quilt core are worse than those of Examples 1-4. Moreover, after multiple washings, the air permeability and thermal insulation performance of the bamboo fiber quilt core of Comparative Example 1 decrease faster, which is because the surface of the bamboo fiber has irregular oval or elliptical pores in cross section, which makes it easy to tear during the washing process.

Compared with Comparative Example 2, Comparative Example 2 uses the more widely used thermoplastic water-based polyurethane on the market to modify the bamboo fiber, and has good air permeability and thermal insulation performance. However, after washing 50 times and more than 100 times, the air permeability and thermal insulation performance of the bamboo fiber quilt core of Comparative Example 2 began to decline significantly. This is because the interface compatibility between the bamboo fiber and the polymer is not strong, which leads to separation between the bamboo fiber surface and the polymer during the washing process, thereby reducing the air permeability and thermal insulation performance.

And by analyzing Examples 1-4, it can be concluded that when the modified polymer is synthesized using N-(3,4-dihydroxy-6-acrylamidomethylbenzyl)acrylamide as the polymer monomer raw material, it can have better air permeability and thermal insulation performance. This is because the phenolic hydroxyl group is an electron-repelling group, which can increase the electron cloud density of the carbon atoms in the ortho-para positions of the positioning substituent, making the connection between the phenolic hydroxyl group and the hydroxyl group on the bamboo fiber more stable.

On the other hand, the present application analyzes the air permeability and warmth retention performance of the bamboo fiber quilt cores prepared in Examples 1-4 and Comparative Examples 1-2 after prolonged exposure to the sun. Observing the two sets of data analysis of Group B, the surface of the bamboo fiber in the bamboo fiber quilt core in Comparative Example 1 after exposure to the sun is damaged, resulting in a decrease in its air permeability and warmth retention performance after exposure to the sun. In addition, the thermoplastic waterborne polyurethane in Comparative Example 2 modifies the bamboo fiber, and due to temperature and ultraviolet radiation, the interface compatibility between the bamboo fiber and the thermoplastic polymer becomes poor.

In addition, according to Examples 1-4, it can be seen that when the modified polymer is synthesized using N-(3,4-dihydroxy-6-acrylamidemethylbenzyl)acrylamide as the polymer monomer raw material, it can have better air permeability and thermal insulation performance. In summary, Example 1 is the best example.

Embodiment 5-6

Example 5

The difference between Example 5 and Example 1 is that, in the process of preparing the bamboo-plastic composite fiber, the buffer used is TAE buffer.

Example 6

The difference between Example 6 and Example 1 is that, in the preparation process of the bamboo-plastic composite fiber, the buffer used is MOPS buffer.

In the synthesis process of Example 1 and Example 5-6, a weakly alkaline environment is provided for the synthesis process of the bamboo-plastic composite fiber by adding a buffer, so that the modified polymer is loaded on the surface of the bamboo fiber. After multiple experiments, the buffer used is TAE buffer, which has a better loading effect. Although the final test results of the three are relatively close, compared with Example 1 and Example 6, the generation of precipitation in the solution can be reduced, thereby improving the utilization rate of resources, so Example 5 is the best embodiment.

Embodiment 7-9

Example 7

The difference between Example 7 and Example 5 is that, in the preparation process of the bamboo-plastic composite fiber, polypropylene is used as the dispersant.

Example 8

The difference between Example 8 and Example 5 is that, in the preparation process of the bamboo-plastic composite fiber, the dispersant used is ethylene-acrylic acid copolymer.

Example 9

The difference between Example 9 and Example 5 is that, in the preparation process of the bamboo-plastic composite fiber, the dispersant used is ethylene-vinyl acetate copolymer.

From the analysis between Example 5 and Examples 7-9, it can be concluded that in the preparation process of bamboo-plastic composite fibers, the dispersant helps to improve the uniformity of bamboo fibers and modified polymers in the spinning solution, thereby increasing the ability of the modified polymers to adhere to the bamboo fibers.

After testing, it can be concluded that the difference in dispersants has little effect on the improvement of air permeability and warmth retention, because the dispersant does not participate in the reaction between the bamboo fiber and the modified polymer. However, the improvement of the dispersant can improve the uniformity of the modified polymer loaded on the bamboo fiber. When polypropylene is used as the dispersant, the texture of the obtained bamboo-plastic composite fiber is the best, and it is more suitable for covering the human body. Therefore, Example 7 is the best example of this application.

It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. And the above-mentioned specific embodiments of this specification are described. Other embodiments are within the scope of the attached claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

This specification and drawings are merely exemplary illustrations of the present application and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, a person skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalents, the present application intends to include these modifications and variations.

Claims (8)

1. The moisture-absorbing and breathable bamboo fiber quilt core is characterized by comprising a quilt core sleeve and a quilt core filler filled in the quilt core sleeve; the main component of the quilt core filling is bamboo-plastic composite fiber and cotton fiber;

the raw materials of the bamboo-plastic composite fiber comprise: bamboo fiber, modified polymer, buffer solution, dispersing agent, deionized water and ethanol;

the raw material of the modified polymer comprises an acrylamide monomer with phenolic hydroxyl groups.

2. The moisture-absorbing breathable bamboo fiber quilt core of claim 1, wherein the phenolic hydroxyl-containing acrylamide monomer comprises N- (2, 5-dihydroxy-4-acrylamidomethylbenzyl) acrylamide, N- (3, 4-dihydroxy-6-acrylamidomethylbenzyl) acrylamide, N- (2, 3, 4-trihydroxy-5-acrylamidomethylbenzyl) acrylamide, and N- (2, 4-dihydroxy-5-acrylamidomethylbenzyl) acrylamide.

3. The absorbent breathable bamboo fiber quilt core of claim 2, wherein each of said phenolic hydroxyl group containing acrylamide monomers is synthesized from catechol, hydroquinone, resorcinol, and pyrogallol, respectively, with N-methylacetamide.

4. The moisture-absorbing breathable bamboo fiber quilt core of claim 2, wherein the initiator for polymerizing the acrylamide monomer having a phenolic hydroxyl group into the modified polymer is azobisisoheptonitrile.

5. The moisture-absorbing breathable bamboo fiber quilt core according to claim 1, wherein the buffer is one of TBE buffer, TAE buffer, and MOPS buffer.

6. The moisture-absorbing breathable bamboo fiber quilt core of claim 1 wherein the dispersant comprises one or more of polyethylene, polypropylene, ethylene-acrylic acid copolymer, ethylene-vinyl acetate copolymer.

7. A method for preparing the moisture-absorbing and breathable bamboo fiber quilt core according to claims 1-6, comprising the following steps, characterized in that:

S1, preparation of an acrylamide monomer: catechol, hydroquinone, resorcinol and pyrogallol are respectively mixed with N-methylacetamide according to the mol ratio of 2:1, respectively carrying out ultrasonic treatment until the raw materials are completely dissolved, mechanically stirring at 25-45 ℃, setting the rotating speed to 500-1000 rpm, slowly adding a certain amount of concentrated sulfuric acid, waiting for 72-144h, stopping stirring, waiting for precipitation for 12-36h, carrying out suction filtration, removing filtrate, washing with plasma water for 3-5 times, and recrystallizing an acrylamide monomer until the pH value of the removed filtrate is 7 to obtain the acrylamide monomer with phenolic hydroxyl groups;

S2, preparation of a modified polymer: mixing acrylamide monomer with phenolic hydroxyl with absolute ethyl alcohol according to a proportion, controlling the temperature to be 60-80 ℃, dissolving the acrylamide monomer by ultrasonic treatment, cooling to 20-30 ℃, adding an initiator azo-diisoheptonitrile, continuing to carry out ultrasonic treatment and dissolving, finally heating to 60-80 ℃ for precipitation polymerization, keeping the temperature for 8-12h, carrying out centrifugal stirring treatment for 0.5-1 h, rotating at 5000-8000 rpm, and finally adopting absolute ethyl alcohol for three times to obtain a modified polymer;

S3, pretreatment of bamboo fibers: cutting natural raw bamboo into bamboo chips, crushing into bamboo filaments, immersing into a mixed solution of deionized water and absolute ethyl alcohol with the volume ratio of 50%, and cleaning for 3-5 times; immersing the cleaned bamboo filaments into a solution containing biological enzymes for 3-12 hours, and cleaning, opening and carding the bamboo fibers after enzyme decomposition to obtain bamboo fibrils;

S4, preparing the bamboo-plastic composite fiber: dissolving the modified polymer in deionized water, adding pretreated bamboo fibers according to a certain proportion, adding a certain amount of buffer solution and dispersing agent, controlling the pH value between 8 and 9, stirring the mixed solution at a speed of 4000rpm-6000rpm for 18-28 hours at a certain temperature, and washing by the deionized water to obtain the bamboo-plastic composite fiber.

8. The moisture-absorbing and breathable bamboo fiber quilt core according to claim 7, wherein the preparation method of the quilt core filler comprises the following steps: winding, stretching and carding the bamboo-plastic composite fiber and the cotton fiber, cutting the bamboo-fiber quilt core sleeve into a required size, sewing the quilt cover into a quilt cover with one end open, sleeving the quilt core filler into the bamboo-fiber quilt core sleeve, and carrying out diffraction sewing to obtain the bamboo-fiber quilt core.