Preparation method and application of lotus fiber composite water-jet-laced cloth

Abstract

The application provides a preparation method and application of lotus fiber composite water-jet-laced cloth. The preparation method comprises the following steps: S1. unwinding a bottom layer fabric to a receiving screen surface; S2. coating slurry prepared from lotus fiber tissues on the surface of the bottom layer fabric, adjusting screen suction pressure, and filtering water in the slurry to obtain a composite layer of lotus fiber web and the bottom layer fabric; S3. feeding the composite layer into a water-jet-lacing machine for water-jet-lacing; and S4. drying and winding the fiber web after water-jet-lacing into a roll to obtain the lotus fiber composite water-jet-laced cloth. Compared with a traditional method of extracting lotus fiber and then separating and obtaining the lotus fiber, the application obtains slurry by beating the lotus fiber tissues obtained from lotus stems, coats the slurry on the surface of the bottom layer fabric, and obtains the composite water-jet-laced cloth by water-jet-lacing treatment. The operation process is simplified, the strength of the composite water-jet-laced cloth is ensured, the health care effect of the lotus stem itself can be exerted, and the lotus stem is beneficial to being used as a mask base cloth, clothes, bedding, wiping cloth and other fabrics directly contacting human skin.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textiles, in particular to a preparation method and application of lotus fiber composite water-jet fabric. BACKGROUND

[0002] The lotus rhizome is widely planted in China, and the main purpose is to harvest lotus rhizomes and lotus seeds. Every year, millions of tons of lotus stems are randomly discarded and rot. Extracting lotus fiber from lotus stems can develop and utilize the resources of discarded lotus stems, bringing considerable economic and social benefits to lotus growers and the region. At the same time, as a natural plant fiber, lotus fiber contains antibacterial and health bioactive components that are beneficial to the human body. Lotus fiber is obtained from lotus stems, which is green, environmentally friendly, has little industrial pollution, and is easily biodegradable, making it an ideal fiber material.

[0003] The yield of manually extracting lotus fiber directly from lotus stems is very low. It is recorded that 35,000 fresh lotus stem leaves are needed to produce one meter of lotus fiber fabric. It takes ten female workers a month to weave a piece of robe. Lotus stems are mainly composed of cellulose, lignin, hemicellulose, pectin, and a small amount of wax and protein. Lotus fiber can also be prepared by degumming. Currently, acid and alkali treatments are usually required in degumming. A method for preparing lotus stem fiber according to CN110670146A is implemented in the following steps: Step 1, pretreatment of lotus stems; Step 2, alkali treatment of pretreated lotus stems; Step 3, acid treatment of alkali-treated lotus stems; Step 4, degumming and bleaching treatment of acid-treated lotus stems; Step 5, mechanical impact, water washing, dehydration, oiling, and drying of the lotus stems treated in Step 4 to obtain lotus stem fiber. In the process of preparing lotus stem fiber, strong acid and strong alkali are used, which can achieve the purpose of degumming, but the use of strong acid and strong alkali inevitably leads to the loss of effective components such as flavonoids and alkaloids in lotus stems, greatly reducing the antibacterial and health effects of lotus fiber products. The use of chemical reagents pollutes the environment and affects the health of production workers and corrodes machine equipment. Moreover, the whole process is complex, and the yield of lotus fiber is low, which is not conducive to large-scale industrial production. In addition, the low strength of lotus fiber obtained by degumming greatly limits its application. There are few reports on the application of lotus fiber, and how to prepare lotus fiber into fiber products is also a difficult problem to be solved. SUMMARY

[0004] Therefore, the present application aims to provide a preparation method and application of lotus fiber composite water-jet fabric, which does not require acid and alkali treatment, has milder reaction conditions, reduces the damage of chemical reagents to beneficial components of lotus stems, and does not need to intentionally separate lotus fiber, thereby improving efficiency.

[0005] To achieve the above object, the technical scheme of the present application is as follows:

[0006] In one aspect, the present application provides a preparation method of lotus fiber composite water-jet-laced cloth, which comprises the following steps:

[0007] S1. unwinding the bottom layer fabric to the receiving screen surface of the wet laying equipment;

[0008] S2. coating the slurry prepared from lotus fiber tissue on the surface of the bottom layer fabric, adjusting the suction pressure of the screen, filtering the water in the slurry to form lotus fiber tissue on the bottom layer fabric, and obtaining the composite layer with the weight ratio of lotus fiber tissue to bottom layer fabric being 1:4-10 by controlling the screen speed and the mass per unit area of the fabric;

[0009] S3. sending the composite layer obtained in step S2 into the water-jet-lacing machine for water-jet-lacing;

[0010] S4. drying the fiber tissue after water-jet-lacing, and winding into a roll after drying, thus obtaining the lotus fiber composite water-jet-laced cloth.

[0011] In step S2, the lotus fiber tissue forms a slurry with water as the carrier, and is dispersed in water, and forms lotus fiber tissue on the bottom layer fabric after dehydration. By controlling the screen speed and suction pressure parameters, the surface density of the lotus fiber tissue can be controlled. It should be noted that, in view of the unwinding operation and the adjustment of the suction pressure of the screen to filter the water, this is the prior art, and will not be described here.

[0012] Further, the slurry prepared from lotus fiber tissue in step S2 comprises the following steps:

[0013] S21. cutting the lotus stem into small pieces of 4-7 cm, and placing them in clean water, and boiling at 80-95℃ for 1-1.5 h while stirring;

[0014] S22. taking out the lotus stem treated in step S21, and repeatedly beating to separate the lotus fiber tissue from the outer skin of the lotus stem;

[0015] S23. washing with hot water at 60-75℃ at a bath ratio of 1:8-10 for 10-15 min to remove the outer skin of the lotus stem;

[0016] S24. preparing a composite solution of xylanase and pectinase at 10-15 g / L, and adjusting the pH to 9.0-10.5, and placing the material treated in step S23 into the composite solution for heating and stirring;

[0017] S25. after stopping heating and stirring, pouring into a PFI beater for beating treatment;

[0018] S26. Dissociate the material liquid after beating treatment, screen out coarse fibers with fineness greater than 100 microns, and obtain the pulp solution prepared by lotus fiber tissue.

[0019] Xylanase can dissolve the hemicellulose connected with lignin, which is beneficial to the dissolution of lignin, realizes the separation of lignin from cellulose and hemicellulose, and makes the fiber softer. By adding xylanase, the cellulose can be protected from being damaged during beating. Alkaline pectinase can remove pectin. By using xylanase and alkaline pectinase for degumming of lotus fiber, the interference with beating can be reduced.

[0020] Further, in step S1, the bottom fabric is selected from at least one of pure cotton spunlace fabric and viscose spunlace fabric.

[0021] Further, in step S3, the composite layer is sent into a spunlace machine for positive and negative two-way spunlace. The front surface adopts first and second spunlace, and the back surface adopts third and fourth spunlace. The first spunlace pressure is 40-50 bar, the second and third spunlace pressures are 130-140 bar, and the fourth spunlace pressure is 40-50 bar. By spunlace treatment and suitable spunlace pressure, the strength of the web material can be improved without adding chemical additives.

[0022] Further, in step S24, the mass ratio of xylanase and pectinase is 1:1.

[0023] Further, in step S24, the weight ratio of the material and the composite solution is 1:8-10.

[0024] Further, in step S24, heating and stirring are carried out at 40-60℃ for 0.5-1h.

[0025] Further, in step S25, the beating speed is 400-600r / min, and the beating time is 0.5-1h.

[0026] Further, in step S26, the length of lotus fiber in the pulp solution prepared by lotus fiber tissue is 8-12mm, and the fineness is 24-28μm.

[0027] Another invention, the present application also proposes a preparation method of lotus fiber composite spunlace fabric, and the application of the lotus fiber composite spunlace fabric prepared by the preparation method in face mask base cloth, clothes, bedding, and wiping cloth.

[0028] Compared with the prior art, the preparation method and application of the lotus fiber composite spunlace fabric have the following advantages:

[0029] (1) The lotus fiber tissue is obtained from the lotus stem in the present application, but the lotus fiber tissue is prepared into a slurry without the need of separately taking out the lotus fiber, which reduces the operation steps, overcomes the problems of low lotus fiber yield, high energy consumption and complicated separate separation, and is beneficial to industrial large-scale production and application.

[0030] (2) The lotus fiber tissue is added in the composite water-jet fabric in the present application, and the health care effect is exerted by using the substances contained in the lotus stem, such as flavonoids, alkaloids, various amino acids and trace elements beneficial to human health, which not only reasonably utilizes the lotus stem resources and reduces waste, but also improves the function of the composite water-jet fabric.

[0031] (3) The present application reduces the use of strong acid and strong base chemical agents by using mild enzyme treatment for degumming, and is beneficial to reducing the damage of acid and alkali treatment to beneficial substances in the lotus stem. The enzyme degumming is assisted by beating technology to improve the content of cellulose fibers in the lotus fiber, and a product with good performance parameters is prepared.

[0032] (4) In the present application, the lotus fiber tissue is prepared into a slurry and coated on the bottom fabric, and then the fibers contained in the slurry are intertwined together by the action of water jetting, so that the prepared composite water-jet fabric has a certain strength. The strength of the composite water-jet fabric is enhanced by the water jetting reinforcement, avoiding the use of chemical adhesives to increase the strength, so that the composite water-jet fabric is more green and environmentally friendly, and more suitable for close-to-body use. At the same time, under the action of high water jetting pressure, the lotus fiber tissue in the slurry can be further refined and opened. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the illustrative embodiments of the present application and their description are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0034] Figure 1 The scanning electron microscope image of the lotus fiber composite water-jet fabric described in Example 1 of the present application. DETAILED DESCRIPTION

[0035] The present application will be further described in conjunction with specific embodiments. It should be first pointed out that the data in the following experimental examples are obtained by the inventors through a large number of experiments, and only a part of them are shown in the specification due to the limited space, and the ordinary skilled in the art can understand and implement the present application based on the data. These examples are only used to illustrate the present application and not to limit the scope of the present application. In addition, it should be understood that after reading the content of the present application, those skilled in the art can make various modifications or modifications to the present application, and these modifications or modifications also fall within the scope of the present application.

[0036] Example 1

[0037] Lotus stems are washed clean and cut into 4-7 cm small pieces, then put into clean water, and boiled at 80°C for 1 h while stirring; then the lotus stems are fished out, and repeatedly beaten to separate the lotus fiber tissues from the outer skin of the lotus stems; the outer skin of the lotus stems is removed by washing with 60°C water at a bath ratio of 1:8 for 10 min.

[0038] The xylanase and pectinase are added into water according to a mass ratio of 1:1 to prepare a 10 g / L compound solution, and the pH is adjusted to 9.0; the material obtained after water washing and the compound solution are mixed according to a mass ratio of 1:8, and heated and stirred for 0.5 h at a heating temperature of 40°C; after stopping the heating and stirring, the material is sent into a PFI beater to be beaten; the material liquid after beating is dissociated, and the coarse fibers with a fineness greater than 100 microns are screened out to obtain a pulp liquid prepared from lotus fiber tissues, the rotating speed during beating is 400 r / min, and the beating time is 0.5 h. The length of the lotus fiber in the pulp liquid is 12 mm, and the fineness is 28 microns.

[0039] The pure cotton hydroentangled fabric with a unit area mass of 40 g / m 2 is unwound to the receiving screen surface of a wet laying equipment; the pulp liquid prepared from lotus fiber tissues is coated on the surface of the pure cotton hydroentangled fabric, the screen suction pressure is adjusted, and the water in the pulp liquid is filtered out to form a lotus fiber web on the bottom layer of the pure cotton hydroentangled fabric; by controlling the screen speed and the unit area mass of the fabric, a composite layer with a weight ratio of the lotus fiber web to the pure cotton hydroentangled fabric of 1:10 is obtained, and is sent into a hydroentangling machine to be hydroentangled for two times on the front and back sides, the front side is hydroentangled for the first and second times, and the back side is hydroentangled for the third and fourth times, the first time hydroentangling pressure is 40 bar, the second and third times hydroentangling pressures are 130 bar, and the fourth time hydroentangling pressure is 50 bar. The fiber web after hydroentangling is dried, and then wound into a roll to obtain a lotus fiber composite hydroentangled fabric.

[0040] Example 2

[0041] Lotus stems are washed clean and cut into 4-7 cm small pieces, then put into clean water, and boiled at 95°C for 1.5 h while stirring; then the lotus stems are fished out, and repeatedly beaten to separate the lotus fiber tissues from the outer skin of the lotus stems; the outer skin of the lotus stems is removed by washing with 75°C water at a bath ratio of 1:10 for 15 min.

[0042] The xylanase and pectinase are added into water in a mass ratio of 1:1 to prepare a composite solution of 15 g / L, and the pH is adjusted to 10.5. The material obtained after water washing is mixed with the composite solution in a mass ratio of 1:10, and heated and stirred for 1 h at a heating temperature of 60°C. After stopping the heating and stirring, the material is sent into a PFI beater to be beaten. The material liquid after beating is dissociated, and the coarse fibers with a fineness greater than 100 microns are screened out to obtain a slurry of lotus fiber tissue preparation. The rotation speed during beating is 600 r / min, and the beating time is 1 h. The length of the lotus fiber in the slurry is 8 mm, and the fineness is 24 microns.

[0043] The pure cotton water-jet fabric with a unit area mass of 40 g / m 2 is unwound to the receiving screen surface of a wet laying equipment. The slurry of lotus fiber tissue preparation is coated on the surface of the pure cotton water-jet fabric, the screen suction pressure is adjusted, and the water in the slurry is filtered out to form a lotus fiber web on the bottom layer of the pure cotton water-jet fabric. By controlling the screen speed and the unit area mass of the fabric, a composite layer with a weight ratio of lotus fiber web to pure cotton water-jet fabric of 1:4 is obtained, and is sent into a water-jet machine to be water-jetted for two times on the front and back sides. The front side is water-jetted for the first and second times, and the back side is water-jetted for the third and fourth times. The first water-jet pressure is 50 bar, the second and third water-jet pressures are 140 bar, and the fourth water-jet pressure is 50 bar. The fiber web after water-jetting is dried, and then is wound into a roll to obtain a lotus fiber composite water-jet fabric.

[0044] Example 3

[0045] The lotus stems are washed clean and cut into small pieces of 4-7 cm, and then are put into clean water and boiled at a temperature of 90°C for 1 h while stirring. Then the lotus stems are fished out, and are repeatedly beaten to separate the lotus fiber tissue from the outer skin of the lotus stems. The lotus stems are washed with water at a bath ratio of 1:9 for 13 min at a temperature of 70°C to remove the outer skin of the lotus stems.

[0046] The xylanase and pectinase are added into water in a mass ratio of 1:1 to prepare a composite solution of 12 g / L, and the pH is adjusted to 10.0. The material obtained after water washing is mixed with the composite solution in a mass ratio of 1:9, and is heated and stirred for 40 min at a heating temperature of 50°C. After stopping the heating and stirring, the material is sent into a PFI beater to be beaten. The material liquid after beating is dissociated, and the coarse fibers with a fineness greater than 100 microns are screened out to obtain a slurry of lotus fiber tissue preparation. The rotation speed during beating is 500 r / min, and the beating time is 50 min. The length of the lotus fiber in the slurry is 10 mm, and the fineness is 26 microns.

[0047] The pure cotton water-jet fabric with a unit area mass of 45 g / m 2The viscose fiber spunlace fabric is unwound to the receiving screen surface of the wet laying equipment; the above lotus fiber tissue prepared slurry is coated on the surface of the viscose fiber spunlace fabric, the screen suction pressure is adjusted, the water in the slurry is filtered out to form a lotus fiber web on the bottom layer of the viscose fiber spunlace fabric, by controlling the screen speed and the unit area mass of the fabric, a composite layer with a weight ratio of lotus fiber web to viscose fiber spunlace fabric of 1:8 is obtained, and is sent into the spunlace machine for two forward and two reverse water jets, the first and second water jets are used on the front surface, and the third and fourth water jets are used on the back surface, the first water jet pressure is 40 bar, the second water jet pressure is 140 bar, the third water jet pressure is 130 bar, and the fourth water jet pressure is 45 bar. The fiber web after water jetting is dried and then wound into a roll to obtain a lotus fiber composite spunlace fabric.

[0048] Example 4

[0049] The lotus stems are washed clean and cut into small pieces of 4-7 cm, then put into clean water and boiled at 85℃ for 80 min while stirring; then the lotus stems are taken out and repeatedly beaten to separate the lotus fiber tissue from the outer skin of the lotus stems; the outer skin of the lotus stems is removed by washing with water at 65℃ for 12 min with a bath ratio of 1:9.

[0050] The xylanase and pectinase are added into water according to a mass ratio of 1:1 to prepare a composite solution of 13 g / L, and the pH is adjusted to 9.8; the material obtained after washing and the composite solution are mixed according to a mass ratio of 1:10, and heated and stirred for 1 h at a heating temperature of 45℃; after stopping heating and stirring, the material is sent into a PFI beater for beating treatment; the material liquid after beating treatment is dissociated, and the coarse fibers with a fineness greater than 100 microns are screened out to obtain a lotus fiber tissue prepared slurry, the rotating speed during beating is 500 r / min, and the beating time is 1 h. The length of the lotus fiber in the slurry is 10 mm, and the fineness is 27 microns.

[0051] The viscose fiber spunlace fabric with a unit area mass of 45 g / m 2 The viscose fiber spunlace fabric is unwound to the receiving screen surface of the wet laying equipment; the above lotus fiber tissue prepared slurry is coated on the surface of the viscose fiber spunlace fabric, the screen suction pressure is adjusted, the water in the slurry is filtered out to form a lotus fiber web on the bottom layer of the viscose fiber spunlace fabric, by controlling the screen speed and the unit area mass of the fabric, a composite layer with a weight ratio of lotus fiber web to viscose fiber spunlace fabric of 1:8 is obtained, and is sent into the spunlace machine for two forward and two reverse water jets, the first and second water jets are used on the front surface, and the third and fourth water jets are used on the back surface, the first water jet pressure is 40 bar, the second water jet pressure is 140 bar, the third water jet pressure is 130 bar, and the fourth water jet pressure is 45 bar. The fiber web after water jetting is dried and then wound into a roll to obtain a lotus fiber composite spunlace fabric.

[0052] The composite spunlace fabric prepared in Examples 1-4 can be used to prepare a mask base cloth, a wiping cloth, an intimate underwear, a sock, a bed sheet, a quilt cover and the like.

[0053] The lotus fiber composite spunlace fabric prepared by the method of Examples 1-4 of the present application is observed by a scanning electron microscope. Taking the electron microscope picture of the sample of Example 1 as an example for illustration, see Figure 1 It can be observed that a plurality of lotus fibers in strip structure, and the surface of the lotus fiber is relatively smooth. It is illustrated that the method of the present application can finally obtain the composite spunlace fabric with lotus fibers. The lotus fibers added into the fabric can play the effects of antibacterial, mildewproof and health care of lotus stems, and are suitable for being used as intimate fabric for human body.

[0054] Comparative Example 1

[0055] The lotus silk mask base cloth is prepared by the method of Example 1 in CN111876896A.

[0056] Comparative Example 2

[0057] The preparation method of Comparative Example 2 is the same as that of Example 1, except that only pectinase is added without adding xylanase. That is, the pectinase is added into water to prepare a composite solution of 10 g / L, and the pH is adjusted to 9.0. The material obtained after water washing and the composite solution are mixed according to a mass ratio of 1:8, and heated and stirred for 0.5 h at a heating temperature of 40°C. After stopping the heating and stirring, the material liquid is sent into a PFI beater for beating treatment. The beating treatment of the material liquid is dissociated, and the coarse fibers with a fineness greater than 100 microns are screened out to obtain a pulp solution prepared by lotus fiber organization. The rotating speed during beating is 400 r / min, and the beating time is 0.5 h.

[0058] The xylanase can protect the cellulose from being destroyed, and is helpful for degumming of the lotus fiber. In Comparative Example 2, the fibers cannot be effectively dissociated due to the absence of xylanase, and the number of coarse fibers is relatively large after beating. Therefore, a large number of coarse fibers are screened out when the coarse fibers with a fineness greater than 100 microns are screened out, which is more than the coarse fibers screened out in Examples 1-4. The number of coarse fibers is relatively large, and the retained fine fibers meeting the use requirements are relatively small, which causes waste of resources. The composite spunlace fabric obtained by water jetting is softer in surface than the composite spunlace fabric of Examples 1-4, but the composite spunlace fabric obtained in Comparative Example 2 is rough in surface. It is speculated that the lignin, hemicellulose, pectin and the like are enzymatically hydrolyzed under the action of the added xylanase and pectinase, so that the specific surface area of the fibers is increased, the water is more easily entered into the interior of the fibers to promote the water absorption and swelling of the fibers, the beating effect is improved, and the fibers in the pulp solution are more uniformly distributed. With the aid of the mechanical force of beating, the fibers are further dissociated, and the fine fibers are more easily detached, so as to promote the fine fiberization of the fibers in the lotus fiber organization pulp solution. Finally, the obtained composite spunlace fabric is also relatively soft.

[0059] Performance detection

[0060] The spunlace fabrics prepared by Examples 1-4 and Comparative Example 1 were subjected to mechanical strength detection, and the specific results are shown in Table 1. The mechanical strength detection was carried out according to GB / T 24218.3-2010 Textiles-Determination of tensile strength and elongation-part 3: test conditions and test methods for woven fabric.

[0061] Table 1

[0062] Group No. Breaking strength (N) Breaking elongation (%) Example 1 45 40 Example 2 48 38 Example 3 55 35 Example 4 58 32 Comparative Example 1 4 5 Comparative Example 2 35 30

[0063] As can be seen from Table 1, the lotus fiber composite spunlace fabric prepared by the method of the present application has high strength and elongation, which can meet the requirements of the mask base cloth, wiping cloth, close-fitting underwear, socks, bed sheet and quilt cover. It provides a new way for the practical application of lotus fiber, and solves the problem of small strength and limited practical application of lotus fiber in the textile industry for a long time. In addition to using the strength of the bottom fabric, the lotus fiber is treated by beating-up to deepen the fibrillation degree of the fiber, so that the interweaving of the fibers in the finally prepared spunlace fabric is more compact, and the strength of the spunlace fabric is improved. The lotus silk mask base cloth prepared by Comparative Example 1 has a breaking strength of 4N, which is small and brittle, and the application range is limited. Because the strength and elongation are very small, it brings great difficulty to the cutting and use of the mask as a mask base cloth. Moreover, the yield of lotus fiber is low, which requires a large amount of materials.

[0064] The spunlace fabrics prepared by Examples 1-4 and Comparative Example 1 were subjected to water absorption ratio and hand feeling detection, and the specific data are shown in Table 2. The water absorption ratio was detected according to GB / T 24218.6-2010 Textiles-Determination of absorbency-part 6: test method.

[0065] Table 2

[0066] Group No. Water absorption (times) Hand feeling Example 1 10.8 Soft Example 2 12.0 Soft Example 3 10.5 Soft Example 4 11.8 Soft Comparative Example 2 8.3 Slightly rough

[0067] The liquid absorption amount (i.e. the water absorption ratio described in the present application) is an important technical index of the mask base cloth. As can be seen from Table 2, the lotus fiber composite spunlace fabric prepared by the method of Examples 1-4 has soft hand feeling, and the water absorption ratio reaches 10.8-12.0 times, which is higher than the conventional requirement of 7 times. The lotus silk mask base cloth prepared by Comparative Example 1 cannot evaluate this performance. The lotus fiber composite spunlace fabric prepared by the method of the present application can improve the water absorption ratio, and is more skin-friendly when in contact with the human body, thereby improving the user's use comfort. As a mask base cloth, it can load more mask liquid and prolong the application time. As a wiping cloth, close-fitting underwear, socks, bed sheet and quilt cover, it is more skin-friendly and soft when in contact with the human skin, thereby slowing down the dryness of the human skin.

[0068] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for preparing a lotus fiber composite spunlace fabric, characterized in that, The following steps are used: S1. Unwind the bottom layer fabric onto the receiving screen surface of the wet web forming equipment; S2. The slurry prepared from lotus fiber structure is coated onto the surface of the underlying fabric. The suction pressure of the mesh curtain is adjusted to filter out the water in the slurry, thereby forming a lotus fiber web on the underlying fabric. By controlling the speed of the mesh curtain and the unit area mass of the fabric, a composite layer with a weight ratio of lotus fiber web to underlying fabric of 1:4-10 is obtained. The preparation of the slurry from the lotus fiber tissue includes the following steps: S21. Cut the lotus stems into 4-7cm sections and put them into clean water. Boil at 80-95℃ for 1-1.5 hours while stirring. S22. Take out the lotus stems after the treatment in step S21, and repeatedly pound them to separate the lotus fiber tissue from the outer skin of the lotus stems; S23. Wash the lotus stems with hot water at 60-75℃ at a bath ratio of 1:8-10 for 10-15 minutes to remove the outer skin. S24. Prepare a composite solution of xylanase and alkaline pectinase at a concentration of 10-15 g / L, and adjust the pH to 9.0-10.

5. Place the material treated in step S23 into the composite solution and heat and stir. S25. After stopping heating and stirring, pour the mixture into a PFI pulper for pulping. S26. The pulping liquid is dissociated, and coarse fibers with a fineness greater than 100 micrometers are screened out to obtain the pulp prepared from lotus fiber tissue. S3. The composite layer obtained in step S2 is fed into a hydroentanglement machine for hydroentanglement; S4. The spunlace fiber web is dried, and after drying, it is wound into a roll to obtain the lotus fiber composite spunlace fabric.

2. The method for preparing a lotus fiber composite spunlace fabric according to claim 1, characterized in that, In step S1, the bottom fabric is selected from at least one of pure cotton spunlace fabric and viscose fiber spunlace fabric.

3. The method for preparing a lotus fiber composite spunlace fabric according to claim 1, characterized in that, In step S3, the composite layer is fed into a hydroentangling machine for two hydroentangling passes in each direction. The pressure of the first hydroentangling pass is 40-50 bar, the pressure of the second and third hydroentangling passes is 130-140 bar, and the pressure of the fourth hydroentangling pass is 40-50 bar.

4. The method for preparing a lotus fiber composite spunlace fabric according to claim 1, characterized in that, In step S24, the mass ratio of xylanase to alkaline pectinase is 1:

1.

5. The method for preparing a lotus fiber composite spunlace fabric according to claim 1, characterized in that, In step S24, the weight ratio of the material to the composite solution is 1:8-10.

6. The method for preparing a lotus fiber composite spunlace fabric according to claim 1, characterized in that, In step S24, the mixture is heated and stirred at 40-60℃ for 0.5-1h.

7. The method for preparing a lotus fiber composite spunlace fabric according to claim 1, characterized in that, In step S25, the pulping speed is 400-600 r / min and the pulping time is 0.5-1 h.

8. The application of the lotus fiber composite spunlace fabric prepared by the method of any one of claims 1-7 in mask base fabric, clothing, bedding, and wiping cloth.

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