Functional plant fiber containing probiotic microcapsules

Abstract

The present invention discloses a functional plant fiber containing probiotic microcapsules, and the preparation method thereof is as follows: in the process of preparing plant leaves into spinning solution, probiotic microcapsules and synergists are added, and then the functional plant fiber is prepared by wet spinning. The functional plant fiber prepared by the present invention not only has good antibacterial function, but also has good ultraviolet protection function, and has good application prospects in textile fields such as clothing and home textiles.

Description

Technical Field

[0001] The invention relates to the technical field of plant fiber production, and in particular to functional plant fiber containing probiotic microcapsules. Background Art

[0002] Natural plant fiber is one of the most abundant renewable resources in nature. It is biodegradable and environmentally friendly. Its main components, cellulose, hemicellulose and lignin, have functional groups that can participate in chemical reactions in their macromolecular structures. They can be used to prepare functional materials for a variety of purposes and are applied in the fields of textiles, papermaking and composite materials. In southern provinces of my country, such as Guangdong, Guangxi and Hainan, bananas, pineapples and other plants are widely planted. Agricultural waste such as banana stalks and pineapple leaves are used as raw materials for fiber preparation, avoiding environmental pollution and waste of resources caused by discarding them in the fields or burning them in the past. It can also bring corresponding economic value and has good research prospects.

[0003] With the prosperity of China's market economy and the improvement of people's living standards, people have put forward new requirements for the textile and garment industry, and many companies have also joined the new textile market with huge potential for fitness, health protection and disease prevention. New special health fibers are being introduced continuously, and various functional fibers are being developed. The so-called functional fibers are fibers made for the purpose of giving fibers some special functions. For example, the negative ion powder in the negative ion fiber releases negative ions into the environment, creating an environment imitating nature, giving people a fresh and comfortable feeling; far-infrared fiber has the function of absorbing and reflecting far-infrared rays, promoting human metabolism; anti-infrared fiber plays an important role in the military; anti-ultraviolet fiber can block the harm of ultraviolet rays in sunlight to human skin.

[0004] In this context, facing the new requirements for the textile and garment industry and the pursuit of a better life, how to make people wear healthier is one of the goals of the textile and garment industry. As we all know, the ultraviolet rays in sunlight and the excessive reproduction of bacteria in clothing and household textiles bring certain troubles to people. For this reason, many researchers have conducted research on these problems. Patent CN103114439A discloses a non-woven fabric with biological regulation and its preparation method. The technology is treated with a finishing agent prepared by a functional combination liquid containing probiotics, and then air-dried or dried. However, the method uses probiotics to directly finish, which is easy to cause the inactivation of probiotics, resulting in a decrease in effective ingredients, insufficient durability, and a single function, which needs further improvement. Patent CN104783373A discloses a UV-proof multi-color fabric, including a lower cotton layer, a wool layer, and an upper cotton layer, but the fabric is complicated to make, and dyed fibers are used to achieve colorful purposes, which is easy to cause pollution and does not meet the characteristics of the current era of green development. Patent CN102071490A discloses an organic photochromic nanofiber, which comprises dissolving an organic photochromic compound in a polymer solution, preparing the spinning solution into nanofibers through electrostatic spinning technology, and protecting against ultraviolet rays by changing color. However, the fiber has a single function and has the problem that the photochromic phenomenon is not persistent, which makes it difficult to solve the problems of the prior art.

[0005] Therefore, in order to meet the needs of actual life, it is necessary to provide a functional plant fiber containing probiotic microcapsules that has good antibacterial and UV protection effects to solve the problems of the existing technology. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a functional plant fiber containing probiotic microcapsules, which can have good antibacterial and anti-ultraviolet effects to better meet the needs of practical applications.

[0007] To achieve this object, the technical solution of the present invention is as follows:

[0008] The present invention provides a functional plant fiber containing probiotic microcapsules. The preparation method of the functional plant fiber containing probiotic microcapsules comprises the following steps:

[0009] (1) washing the plant leaf raw material and crushing it into pieces, then adding it into a kneader together with the extraction liquid, extracting it for 4-6 hours at a temperature of 90-110° C. and a stirring speed of 100-200 r / min to obtain a spinning solution;

[0010] (2) adding the probiotic microcapsules into the spinning solution, stirring the solution evenly, and then wet spinning the solution to produce plant fibers;

[0011] (3) heating the synergist to a molten state and applying it to the surface of the plant fiber by atomization using an ultrasonic atomization device;

[0012] (4) The plant fiber is then immersed in deionized water, dehydrated at 30-45°C for 2-5 minutes, and then dried under reduced pressure at 30-45°C to obtain the functional plant fiber.

[0013] In the method for preparing functional plant fiber containing probiotic microcapsules of the present invention, in step (1), the extraction liquid includes an aqueous solution of N-methylmorpholine oxide and propyl gallate with a concentration of 50-60%, and the mass ratio of the aqueous solution of N-methylmorpholine oxide to propyl gallate is 5-10:1.

[0014] In the method for preparing functional plant fiber containing probiotic microcapsules of the present invention, in step (2), the particle size of the probiotic microcapsules is 2-6 μm, the mass of the probiotic microcapsules is 1-1.2 times that of plant leaves, the probiotic microcapsules include a shell layer and a core material, the shell layer is dopamine, the core material is probiotics, and the thickness of the shell layer is 0.7-1 μm; the coagulation bath temperature of the wet spinning is 40-50°C.

[0015] In the method for preparing functional plant fiber containing probiotic microcapsules of the present invention, in step (3), the mass of the synergist is 0.5-0.6 times that of the plant fiber.

[0016] In some embodiments of the present invention, the method for preparing the probiotic microcapsules comprises the following steps:

[0017] (1) adding the obtained bacterial core to a 4-hydroxyethylpiperazinepropanesulfonic acid buffer solution at 20-30° C. to obtain a bacterial suspension, then adding dopamine, stirring for 20-30 minutes to mix evenly to form a mixed solution;

[0018] (2) placing the liquid obtained in step (1) at a constant temperature of 35-45° C., adjusting the pH of the mixed solution to 8-9, allowing dopamine to self-polymerize, and continuing the polymerization for 1-2 hours. After the polydopamine shell layer is deposited on the periphery of the bacterial core, the product is a probiotic microcapsule.

[0019] In the preparation method of probiotic microcapsules of the present invention, in step (1), the probiotics are selected from Bifidobacterium adolescentis or Clostridium butyricum; in the mixed solution, the mass ratio of bacterial core, dopamine and 4-hydroxyethylpiperazinepropanesulfonic acid buffer solution is: 1:5-8:10-20, and the concentration of the 4-hydroxyethylpiperazinepropanesulfonic acid buffer solution is 10-30mmol / L.

[0020] In some embodiments of the present invention, the method for preparing the synergist comprises the following steps:

[0021] (1) calcining basic zinc carbonate at 450-480° C. for 5-10 h, grinding it after cooling, and then mixing it with titanate coupling agent JTW-131, ball milling, sieving, and setting aside; calcining cerium carbonate at 500-600° C. for 5-10 h, grinding it after cooling, and then adding lanthanum oxide, mixing them evenly, drying the solid, and setting aside;

[0022] (2) After mixing the spare material obtained in step (1) with the recycled polyester chips, 2,4-dihydroxybenzophenone is added, the mixture is stirred evenly, dried at 90-110° C. for 4-6 hours, melt-extruded through a screw extruder at 200-220° C., cooled by water, stretched, pelletized and dried to prepare a synergist.

[0023] In the preparation method of the synergist of the present invention, the mass ratio of the basic zinc carbonate, cerium carbonate and recycled polyester chips is 1-2:1-2:1; the mass of the titanate coupling agent JTW-131 in step (1) is 0.1-0.3 times that of the basic zinc carbonate, and the mass of the lanthanum oxide is 0.05-0.2 times that of the cerium carbonate; the mass of the 2,4-dihydroxybenzophenone in step (3) is 0.05-0.1 times that of the recycled polyester chips.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The present invention adopts a microcapsule method to encapsulate probiotics in a shell formed by dopamine self-polymerization under mild conditions, and uses a vacuum decompression drying method to avoid the adverse effects of high temperature on probiotics; wherein dopamine can quickly self-polymerize in an alkaline 4-hydroxyethylpiperazinepropanesulfonic acid buffer solution to form a coating layer outside the bacterial core, which has acid and high temperature resistance, further protecting the probiotics. The probiotic microcapsules in plant fibers can have a good inhibitory effect on harmful pathogens such as Staphylococcus aureus and Escherichia coli. At the same time, the dopamine shell formed is one of the main pigments in natural melanin, has light absorption properties similar to melanin, has a wide band absorption in the range of ultraviolet light to visible light, and the light absorption extends all the way to the near-infrared region, so that the prepared plant fiber has an ultraviolet protection effect.

[0026] (2) The synergist used in the present invention is prepared by a series of modifications using basic zinc carbonate, cerium carbonate and recycled polyester chips as raw materials, and is applied to the surface of plant fibers by means of atomization. On the one hand, it can enhance the anti-ultraviolet effect of plant fibers. On the other hand, under the irradiation of ultraviolet light, it can decompose negatively charged electrons by itself, while leaving positively charged holes. Such holes can excite oxygen in the air to become active oxygen, and undergo oxidation reactions with a variety of microorganisms, thereby killing bacteria, and has a particularly good inhibitory effect on Staphylococcus aureus and Escherichia coli.

[0027] Among them, the product obtained by calcining and grinding basic zinc carbonate is an N-type semiconductor. When irradiated by ultraviolet rays, the electrons in the valence band can absorb the energy in the ultraviolet rays and make transitions, converting the energy of ultraviolet rays into the internal energy of molecules, thereby achieving the effect of anti-ultraviolet rays. After surface modification with titanate coupling agent JTW-131, long-chain alkoxy groups are introduced to improve the compatibility of nano zinc oxide with plant fibers and make the appearance of plant fibers better. After calcining and grinding cerium carbonate, it is modified with lanthanum oxide, which can increase the reflectivity and absorption rate of ultraviolet rays and reduce The transmittance of ultraviolet rays can be increased, thereby enhancing the anti-ultraviolet effect. After calcination and grinding, cerium carbonate has a large specific surface area and has a certain adsorption effect. It can load lanthanum oxide and play a role in reflecting ultraviolet rays. Basic zinc carbonate and cerium carbonate are modified and melted together with recycled polyester chips to prepare a synergist. The use of 2,4-dihydroxybenzophenone in this process can further protect the fiber, so that the fiber will not deteriorate or age when exposed to ultraviolet rays for a long time. It is used in the preparation of functional plant fibers, so that the prepared functional plant fibers can have good anti-ultraviolet performance and anti-harmful bacteria function.

[0028] (3) The functional plant fiber containing probiotic microcapsules provided by the present invention is prepared by adding probiotic microcapsules and enhancers into the plant fiber. The probiotic microcapsules and enhancers are used in a coordinated manner, so that the obtained functional plant fiber not only has good antibacterial function, but also has good ultraviolet protection function. When used in textiles such as clothing and home textiles, it can effectively inhibit pathogens and insect mites in textiles such as clothes and carpets, and reduce the harm of ultraviolet rays to the human body. DETAILED DESCRIPTION

[0029] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following examples are examples of the present invention and are only used to illustrate the present invention, rather than to limit the present invention. Without departing from the subject matter or scope of the present invention, other combinations and various improvements within the concept of the present invention may be made. In the following examples, the compounds and related reagents used can be purchased from the market, wherein basic zinc carbonate and cerium carbonate are purchased from Lanzhou Yellow River Zinc and Magnesium Nanomaterials Research Institute, lanthanum oxide is purchased from Ganzhou Guangli High-tech Materials Co., Ltd., 4-hydroxyethylpiperazine propanesulfonic acid buffer solution is purchased from Wuhan Desheng Biochemical Technology Co., Ltd., titanate coupling agent JTW-131 is purchased from Nanjing Nengde New Materials Technology Co., Ltd., and recycled polyester chips are purchased from Zhejiang Haili Environmental Protection Technology Co., Ltd.

[0030] Example 1

[0031] A functional plant fiber containing probiotic microcapsules, wherein the preparation method of the functional plant fiber containing probiotic microcapsules comprises the following steps:

[0032] (1) 100 g of pineapple leaf raw material was washed and crushed into pieces, and then added into a kneader together with 150 g of extraction liquid, and extracted for 6 h at a temperature of 110° C. and a stirring speed of 200 r / min to obtain a spinning solution;

[0033] (2) adding 120 g of probiotic microcapsules into the spinning solution and stirring the solution thoroughly, and then preparing pineapple fibers by wet spinning, with the coagulation bath temperature being 40° C.;

[0034] (3) Take 10g pineapple fiber, heat 6g synergist to molten state, use ultrasonic atomization equipment to apply to the pineapple fiber surface by atomization means;

[0035] (4) The pineapple fiber is then immersed in deionized water, dehydrated at 45°C for 5 min, and then dried under reduced pressure at 30°C to obtain functional pineapple fiber.

[0036] The extraction liquid comprises a 60% aqueous solution of N-methylmorpholine oxide and propyl gallate, the mass ratio of the aqueous solution of N-methylmorpholine oxide and propyl gallate is 10:1, the particle size of the probiotic microcapsule is 6 μm, the probiotic microcapsule comprises a shell layer and a core material, the shell layer is dopamine, the core material is probiotics, and the thickness of the shell layer is 1 μm.

[0037] The preparation method of the probiotic microcapsules comprises the following steps:

[0038] (1) adding 100 g of the obtained Bifidobacterium adolescentis to 1.5 kg of 30 mmol / L 4-hydroxyethylpiperazinepropanesulfonic acid buffer solution at 30° C. to obtain a bacterial suspension, then adding 800 g of dopamine and stirring for 30 min to mix evenly to form a mixed solution;

[0039] (2) The liquid obtained in step (1) is placed at a constant temperature of 35° C., and the pH of the mixed solution is adjusted to 9 to allow dopamine to self-polymerize. The polymerization is continued for 2 hours, and a polydopamine shell is deposited on the periphery of the bacterial core to form a probiotic microcapsule.

[0040] Wherein, the preparation method of the synergist comprises the following steps:

[0041] (1) 100 g of basic zinc carbonate was calcined at 480° C. for 10 h, ground after cooling, and then mixed with 30 g of titanate coupling agent JTW-131, ball-milled, sieved, and set aside; 100 g of cerium carbonate was calcined at 600° C. for 10 h, ground after cooling, and then added with 20 g of lanthanum oxide, mixed evenly, and dried the solid matter for set aside;

[0042] (2) The prepared material obtained in step (1) is mixed with 100 g of recycled polyester chips, and 10 g of 2,4-dihydroxybenzophenone is added, stirred evenly, dried at 110° C. for 6 h, melt-extruded through a screw extruder at 220° C., cooled by water, stretched, pelletized and dried to prepare a synergist.

[0043] Example 2

[0044] A functional plant fiber containing probiotic microcapsules, wherein the preparation method of the functional plant fiber containing probiotic microcapsules comprises the following steps:

[0045] (1) 100 g of pineapple leaf raw material was washed and crushed into pieces, and then added into a kneader together with 150 g of extraction liquid, and extracted for 4 h at a temperature of 90° C. and a stirring speed of 100 r / min to obtain a spinning stock solution;

[0046] (2) adding 100 g of probiotic microcapsules into the spinning solution and stirring the solution thoroughly, and then preparing pineapple fibers by wet spinning, with the coagulation bath temperature being 40° C.;

[0047] (3) Take 10g pineapple fiber, heat 5g synergist to molten state, use ultrasonic atomization equipment to apply to the pineapple fiber surface by atomization means;

[0048] (4) The pineapple fiber is then immersed in deionized water, dehydrated at 30°C for 2 min, and then dried under reduced pressure at 30°C to obtain functional pineapple fiber.

[0049] The extraction liquid comprises an aqueous solution of N-methylmorpholine oxide and propyl gallate at a concentration of 50%, the mass ratio of the aqueous solution of N-methylmorpholine oxide and propyl gallate is 5:1, the particle size of the probiotic microcapsule is 2 μm, the probiotic microcapsule comprises a shell layer and a core material, the shell layer is dopamine, the core material is probiotics, and the thickness of the shell layer is 0.7 μm.

[0050] The preparation method of the probiotic microcapsules comprises the following steps:

[0051] (1) adding 100 g of the obtained Bifidobacterium adolescentis to 1.2 kg of 30 mmol / L 4-hydroxyethylpiperazinepropanesulfonic acid buffer solution at 20° C. to obtain a bacterial suspension, then adding 500 g of dopamine and stirring for 20 min to mix evenly to form a mixed solution;

[0052] (2) The liquid obtained in step (1) is placed at a constant temperature of 45° C., and the pH of the mixed solution is adjusted to 8, so that dopamine self-polymerizes. The polymerization is continued for 1 hour, and a polydopamine shell is deposited on the periphery of the bacterial core to form a probiotic microcapsule.

[0053] Wherein, the preparation method of the synergist comprises the following steps:

[0054] (1) 100 g of basic zinc carbonate was calcined at 450° C. for 5 h, ground after cooling, and then mixed with 30 g of titanate coupling agent JTW-131, ball-milled, sieved, and set aside; 100 g of cerium carbonate was calcined at 500° C. for 5 h, ground after cooling, and then added with 20 g of lanthanum oxide, mixed evenly, and dried the solid matter for set aside;

[0055] (2) The prepared material obtained in step (1) is mixed with 100 g of recycled polyester chips, and 10 g of 2,4-dihydroxybenzophenone is added, stirred evenly, dried at 110° C. for 6 h, melt-extruded through a screw extruder at 220° C., cooled by water, stretched, pelletized and dried to prepare a synergist.

[0056] Example 3

[0057] A functional plant fiber containing probiotic microcapsules, wherein the preparation method of the functional plant fiber containing probiotic microcapsules comprises the following steps:

[0058] (1) 100 g of pineapple leaf raw material was washed and crushed into pieces, and then added into a kneader together with 150 g of extraction liquid, and extracted for 4 h at a temperature of 90° C. and a stirring speed of 100 r / min to obtain a spinning stock solution;

[0059] (2) adding 110 g of probiotic microcapsules into the spinning solution and stirring the solution thoroughly, and then preparing pineapple fibers by wet spinning, with the coagulation bath temperature being 40° C.;

[0060] (3) Take 10g pineapple fiber, heat 5.5g synergist to molten state, use ultrasonic atomization equipment to apply to the pineapple fiber surface by atomization means;

[0061] (4) The pineapple fiber was then immersed in deionized water, dehydrated at 40°C for 3.5 min, and then dried under reduced pressure at 30°C to obtain functional pineapple fiber.

[0062] The extraction liquid comprises an aqueous solution of N-methylmorpholine oxide and propyl gallate at a concentration of 50%, the mass ratio of the aqueous solution of N-methylmorpholine oxide and propyl gallate is 8:1, the particle size of the probiotic microcapsule is 5 μm, the probiotic microcapsule comprises a shell layer and a core material, the shell layer is dopamine, the core material is probiotics, and the thickness of the shell layer is 0.85 μm.

[0063] The preparation method of the probiotic microcapsules comprises the following steps:

[0064] (1) adding 100 g of the obtained Bifidobacterium adolescentis to 1.2 kg of 30 mmol / L 4-hydroxyethylpiperazinepropanesulfonic acid buffer solution at 20° C. to obtain a bacterial suspension, then adding 650 g of dopamine and stirring for 20 min to mix evenly to form a mixed solution;

[0065] (2) The liquid obtained in step (1) is placed at a constant temperature of 45° C., and the pH of the mixed solution is adjusted to 8, so that dopamine self-polymerizes. The polymerization is continued for 1 hour, and a polydopamine shell is deposited on the periphery of the bacterial core to form a probiotic microcapsule.

[0066] Wherein, the preparation method of the synergist comprises the following steps:

[0067] (1) 100 g of basic zinc carbonate was calcined at 450° C. for 5 h, ground after cooling, and then mixed with 20 g of titanate coupling agent JTW-131, ball-milled, sieved, and set aside; 100 g of cerium carbonate was calcined at 500° C. for 5 h, ground after cooling, and then 10 g of lanthanum oxide was added, mixed evenly, and the solid was dried for set aside;

[0068] (2) The prepared material obtained in step (1) is mixed with 100 g of recycled polyester chips, 5 g of 2,4-dihydroxybenzophenone is added, the mixture is stirred evenly, dried at 90° C. for 6 h, melt-extruded at 200° C. through a screw extruder, cooled by water, stretched, pelletized and dried to prepare a synergist.

[0069] Example 4

[0070] The difference from Example 1 is that in the preparation of the synergist, the mass ratio of basic zinc carbonate, cerium carbonate and recycled polyester chips is 5:1:0.5.

[0071] Example 5

[0072] The difference from Example 1 is that in the preparation of the functional plant fiber, the mass of the probiotic microcapsules used is 0.5 times that of the plant leaves.

[0073] Example 6

[0074] The difference from Example 1 is that in the preparation of the functional plant fiber, the mass of the probiotic microcapsules used is 0.1 times that of the plant leaves.

[0075] Comparative Example 1

[0076] The difference from Example 1 is that no probiotic microcapsules are added.

[0077] Comparative Example 2

[0078] The difference from Example 1 is that no synergist is added.

[0079] Comparative Example 3

[0080] The difference from Example 1 is that basic zinc carbonate is not used in the preparation of the synergist.

[0081] Comparative Example 4

[0082] The difference from Example 1 is that cerium oxide is not used in the preparation of the synergist.

[0083] The functional plant fibers prepared in each embodiment and comparative example were subjected to performance tests. The breaking strength and breaking elongation test methods were carried out in accordance with GB / T9997-1988. The fiber antibacterial rate test was carried out in accordance with GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method". The anti-ultraviolet effect of the fiber was tested according to GB / T18830-2009 for ultraviolet transmittance. The specific details are shown in Table 1.

[0084] Table 1 Performance test results of functional plant fibers prepared in Examples and Comparative Examples

[0085]

[0086]

[0087] Comparison of the test results of Comparative Example 1 and Example 5 with Example 1 shows that the use of a specific amount of probiotic microcapsules in the preparation of functional plant fibers can effectively improve the inhibition rate of Staphylococcus aureus and Escherichia coli; Comparative Example 2, Comparative Example 3, Comparative Example 4, Example 4, and Example 6 with Example 1 show that the use of a specific proportion of synergist in the preparation of functional plant fibers can effectively reduce the ultraviolet transmittance. Comprehensive comparison of the test results of various embodiments and comparative examples shows that the functional plant fiber provided by the present invention not only has good antibacterial properties, but also has excellent ultraviolet protection function, and has good application prospects.

[0088] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A functional plant fiber containing probiotic microcapsules, characterized in that: It is prepared by a preparation method comprising the following preparation steps: (1) The plant leaf raw material is washed and crushed into pieces, and then added into a kneader together with the extraction liquid, and extracted for 4-6 hours at a temperature of 90-110° C. and a stirring speed of 100-200 r / min to obtain a spinning solution; (2) adding the probiotic microcapsules into the spinning solution, stirring the solution thoroughly, and then preparing the plant fibers by wet spinning; (3) heating the synergist to a molten state and applying it to the surface of the plant fiber by atomization using an ultrasonic atomization device; (4) Then, the plant fiber is immersed in deionized water, dehydrated at 30-45°C for 2-5 minutes, and then dried under reduced pressure at 30-45°C to obtain the functional plant fiber; The extraction liquid in step (1) comprises an aqueous solution of N-methylmorpholine oxide and propyl gallate at a concentration of 50-60%, wherein the mass ratio of the aqueous solution of N-methylmorpholine oxide to propyl gallate is 5-10:1; The particle size of the probiotic microcapsules in step (2) is 2-6 μm, and the mass of the probiotic microcapsules is 1-1.2 times that of the plant leaves; The preparation method of the synergist comprises the following steps: (1) Calcine basic zinc carbonate at 450-480°C for 5-10h, grind it after cooling, and then mix it with titanate coupling agent JTW-131, ball mill it, sieve it, and set it aside; Calcine cerium carbonate at 500-600°C for 5-10h, grind it after cooling, and then add lanthanum oxide, mix it evenly, dry the solid, and set it aside; (2) mixing the prepared material obtained in step (1) with recycled polyester chips, adding 2,4-dihydroxybenzophenone, stirring evenly, drying at 90-110° C. for 4-6 hours, melt-extruding through a screw extruder at 200-220° C., cooling through water, drawing, pelletizing and drying to prepare a synergist; The mass ratio of the basic zinc carbonate, cerium carbonate and recycled polyester chips is 1-2:1-2:

1.

2. The functional plant fiber containing probiotic microcapsules according to claim 1, characterized in that: The probiotic microcapsule comprises a shell layer and a core material, the shell layer is polydopamine, the core material is probiotics, the thickness of the shell layer is 0.7-1 μm, and the coagulation bath temperature of the wet spinning is 40-50°C.

3. The functional plant fiber containing probiotic microcapsules according to claim 1, characterized in that: The mass of the synergist in step (3) is 0.5-0.6 times that of the plant fiber.

4. The functional plant fiber containing probiotic microcapsules according to claim 1, characterized in that: The preparation method of the probiotic microcapsule comprises the following steps: (1) adding the obtained bacterial core to a 4-hydroxyethylpiperazinepropanesulfonic acid buffer solution at 20-30° C. to obtain a bacterial suspension, then adding dopamine and stirring for 20-30 minutes to mix evenly to form a mixed solution; (2) The liquid obtained in step (1) is placed at a constant temperature of 35-45° C., and the pH of the mixed solution is adjusted to 8-9 to allow dopamine to self-polymerize. The polymerization is continued for 1-2 hours, and a polydopamine shell is deposited on the periphery of the bacterial core to form a probiotic microcapsule.

5. The functional plant fiber containing probiotic microcapsules according to claim 4, characterized in that: The probiotics in step (1) are selected from Bifidobacterium adolescentis or Clostridium butyricum; the mass ratio of the bacterial core, dopamine, and 4-hydroxyethylpiperazinepropanesulfonic acid buffer solution in the mixed solution is 1:5-8:10-20, and the concentration of the 4-hydroxyethylpiperazinepropanesulfonic acid buffer solution is 10-30 mmol / L.

6. The functional plant fiber containing probiotic microcapsules according to claim 1, characterized in that: In step (1), the mass of the titanate coupling agent JTW-131 is 0.1-0.3 times that of basic zinc carbonate; the mass of the lanthanum oxide is 0.05-0.2 times that of cerium carbonate.

7. The functional plant fiber containing probiotic microcapsules according to claim 1, characterized in that: The mass of 2,4-dihydroxybenzophenone in step (3) is 0.05-0.1 times that of the recycled polyester chips.

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