CN109208101B

CN109208101B - Spider silk-like polymer fiber based on spherical porous particles and preparation method thereof

Info

Publication number: CN109208101B
Application number: CN201710528431.9A
Authority: CN
Inventors: 乔金樑; 姜超; 戚桂村; 张晓红; 宋志海; 赖金梅; 蔡传伦; 李秉海; 王湘; 蒋海斌; 张江茹; 茹越; 高建明; 张红彬; 韩朋
Original assignee: Sinopec Beijing Research Institute of Chemical Industry; China Petroleum and Chemical Corp
Current assignee: Sinopec Beijing Research Institute of Chemical Industry; China Petroleum and Chemical Corp
Priority date: 2017-07-01
Filing date: 2017-07-01
Publication date: 2020-06-09
Anticipated expiration: 2037-07-01
Also published as: CN109208101A

Abstract

The invention relates to a spider silk-like polymer fiber based on spherical porous particles and a preparation method thereof, belonging to the technical field of chemical bionics. The spider silk-like polymer fiber comprises the following components in parts by weight: 100 parts of fiber matrix polymer; 1-49 parts of spherical porous particles. The monofilament of the polymer fiber has a spider silk-like microstructure with spindle knot structural units distributed at intervals, the radial height of the spindle knot structural units is 10-300 microns, the axial length of the spindle knot structural units is 10-1000 microns, and the distance between the spindle knot structural units is 10-5000 microns. The method of the invention does not need to greatly change the prior spinning process, does not need to change equipment, and has simple process and low cost. The spider silk-like polymer fiber obtained by the invention can realize the directional movement of water drops on the surface of the fiber, has a water collecting function and has better mechanical property.

Description

Spider silk-like polymer fiber based on spherical porous particles and preparation method thereof

Technical Field

The invention relates to the technical field of chemical bionics, in particular to a spider silk-like polymer fiber based on spherical porous particles and a preparation method thereof.

Background

Water resources are an important natural resource for the development of human society. The water on earth, although in huge quantities, is directly utilizable but poor for production and living, occupying about 0.26% of the total water volume of the sphere. Sustainable utilization of water resources is one of the most important problems in sustainable development and utilization of all natural resources. In the modern society, the shortage of fresh water resources is gradually appearing. Approximately 15 million of the world's 80 countries face a shortage of fresh water, with 3 million of the 26 countries living entirely in a water-deficient state. By 2025, it is expected that 30 billion people worldwide will run short of water, with over 40 countries and regions involved. The shortage of fresh water resources restricts the development of society and the problem of fresh water resources is urgently solved. The solution may exist in the air where 12.9 trillion tons of gaseous water accumulate, which may become an important "water source" for future human domestic water.

Spiders are one of the pioneers in nature who utilize air and water sources. When the spider web is placed in a humid environment, water vapor is condensed on the surface of the capture silk in the spider web to form small water drops; the curvature radius of the captured filament is periodically changed due to the periodic spindle knot structure in the fiber, Laplace pressure difference is generated, the stress of the water drops along the radial direction of the fiber is uneven, and the water drops are pushed to move directionally (towards the spindle knots). The directional movement of the water drops is beneficial to the small liquid drops to be quickly gathered to form large water drops, the transpiration is weakened, and the quick collection of moisture in the air is facilitated. The spider collects water in the air through the process to guarantee survival, and a new idea is provided for solving the freshwater crisis: the spider silk-like fiber with the spindle knot structure is developed, so that the rapid collection of water in the air is realized, the spider silk-like fiber has a wide application prospect in desert, island and other areas, and is expected to be used for dispersing water vapor in airport and other special places.

There are three main methods for preparing spider silk-like fibers of similar structure in the prior art.

The first is the dipping method: the method is adopted for a water-collecting polymer silk imitating a spider silk structure disclosed in Chinese patent with publication No. CN102776785A (application No. 201110223679.7). after existing fibers are immersed in a high molecular solution, the high molecular solution forms a string of liquid drops on the fiber surface due to Rayleigh instability in the drying process, and the liquid drops are hung on the fiber surface, and are dried and solidified to obtain spindle knots which are axially arranged, so that the fibers similar to the spider silk structure are obtained. Based on the above patent, chinese patent publication No. CN102587139A (application No. 201210004686.2) further realizes that the height of the protruding nodes on the surface of the prepared fiber is uniform and controllable from small to large, and the surface of the fiber has microscopic protrusions or micropores, thereby improving the water collection efficiency of the fiber. The method belongs to post-processing of the existing fibers.

Secondly, the electrostatic spinning method has higher requirements on equipment: chinese patent with publication number CN103334244A (application number 201710227113.0) discloses a self-assembly preparation method of an electrospinning bead string fiber, which adopts an electrospinning technology to form a micron-sized bead string structure on the surface of artificial fiber by self-assembly to obtain an spider silk-like fiber. However, electrospinning equipment is expensive and fewer polymers can be used for electrospinning.

Thirdly, a wet spinning method is utilized: the invention provides a bionic spider silk polymer fiber with water collection characteristic and a preparation method thereof, which is provided by Chinese patent with application number 201710166815.0. But the mechanical properties of the fibres are affected to some extent due to the weaker interaction of the additives with the fibre matrix.

Disclosure of Invention

In order to solve the above problems in the prior art, the present invention proposes a spider silk-like polymer fiber based on spherical porous particles. In particular to a spider silk-like polymer fiber based on spherical porous particles and a preparation method thereof. According to the method, the spherical porous particles are added in the spinning process, the spindle knot structure can be obtained in the fiber preparation process, the problem that the interaction force between the additive and the fiber matrix is weak can be solved to a certain extent through the porous structure, the influence of the additive on the mechanical property of the fiber is reduced, the method does not need to greatly change the existing spinning process, equipment does not need to be changed, and the method is simpler in process and lower in cost.

One of the objectives of the present application is to propose a spider silk-like polymer fiber based on spherical porous particles. The monofilament of the polymer fiber has a spider-like silk microstructure with spindle knot structural units distributed at intervals, can realize the directional movement of water drops on the surface of the fiber, and has a water collecting function. The interval distribution refers to that the two adjacent spindle knot structural units distributed on the monofilament are connected by the monofilament.

The spider silk-like polymer fiber based on the spherical porous particles comprises the following components in parts by weight:

a. 100 parts by weight of a fiber matrix polymer;

b. 1 to 49 parts by weight, preferably 3 to 40 parts by weight, more preferably 5 to 30 parts by weight, and still more preferably 5 to 25 parts by weight of the spherical porous fine particles.

The component a is a fiber matrix polymer as a fiber matrix, and the component b is a spherical porous particle as an additive, so that a spindle knot structure is formed.

The diameter of the fiber main body is 5-250 micrometers, preferably 10-150 micrometers, and more preferably 20-50 micrometers.

The radial height of the spindle section structural unit is 10-300 micrometers, preferably 20-200 micrometers, and more preferably 30-150 micrometers; the axial length of the spindle section structural unit is 10-1000 microns, preferably 20-700 microns, and more preferably 100-300 microns; the interval of the spindle node structural units is 10-5000 micrometers, preferably 50-3000 micrometers, and more preferably 100-1000 micrometers.

The average particle diameter of the spherical porous particles is 0.5 to 200 micrometers, preferably 10 to 150 micrometers, and more preferably 20 to 100 micrometers.

The porosity of the spherical porous fine particles is 10 to 80%, preferably 20 to 60%, and more preferably 20 to 50%.

The pore diameter of the spherical porous particles is 0.1-200 nm, preferably 0.5-150 nm, and more preferably 1-50 nm.

The spherical porous microspheres are selected from various commercially available porous microspheres meeting the above parameters, and can also be prepared by the methods in the prior art.

The spherical porous particles are selected from at least one of silicon dioxide porous microspheres, polystyrene porous microspheres, calcium carbonate porous microspheres, epoxy resin porous microspheres, polylactic acid porous microspheres, phenolic resin porous microspheres, chitosan porous microspheres, carbon porous microspheres, hydroxyapatite porous microspheres, gelatin porous microspheres and metal porous microspheres; preferably at least one of silicon dioxide porous microspheres, polystyrene porous microspheres, calcium carbonate porous microspheres, epoxy resin porous microspheres, polylactic acid porous microspheres, phenolic resin porous microspheres, chitosan porous microspheres and carbon porous microspheres; more preferably at least one of porous silica microspheres, porous polystyrene microspheres, porous calcium carbonate microspheres, and porous carbon microspheres.

The fiber matrix polymer is prepared from various fiber forming polymers in the prior art, such as at least one of polyacrylonitrile, polyurethane, polyvinyl alcohol, viscose fiber, nylon, cellulose sulfonate, cellulose acetate, polyvinyl chloride, polyisophthaloyl amide, polyisophthaloyl metaphenylene diamine and poly terephthaloyl paraphenylene diamine; preferably at least one of polyacrylonitrile, polyurethane, polyvinyl alcohol, viscose, poly (m-phenylene isophthalamide), poly (p-phenylene terephthalamide), and polyvinyl chloride, more preferably at least one of polyacrylonitrile, polyurethane, and polyvinyl alcohol, and more preferably polyvinyl alcohol.

When the fiber matrix polymer selects polyvinyl alcohol as a fiber main body, the polymerization degree of the polyvinyl alcohol is 400-4000, preferably 500-3000, and more preferably 1000-2500; the alcoholysis degree is 55-99%, preferably 88-99%.

Another purpose of the application is to provide a preparation method of the spider silk-like polymer fiber based on the spherical porous particles. The method comprises the steps of spinning a polymer and a spherical porous particle additive together by a traditional wet spinning process, dispersing spherical porous particles in a polymer solution, and diffusing the polymer solution into the spherical porous particles; in the subsequent stretching process of forming fibers by spinning stock solution microflow through a coagulating bath, as the solvent is continuously separated out and radially stretched, the volume of the main body of the fibers is greatly shrunk, and the volume of the spherical porous particles is not influenced, so that the fibers are microscopically protruded at the positions where the spherical porous particles exist to form a spindle structure; the polymer solution entering the spherical porous particles is solidified to form a microfiber network, and the spherical porous particles are bound inside the fibers, so that the problem that the interaction force between the spherical porous particles and the fiber matrix is weak is effectively solved, and the influence of the additive on the mechanical properties of the fibers is reduced. The method has simple process, does not need to greatly improve the prior process, and is easy for industrialized production.

The preparation method of the spider silk-like polymer fiber based on the spherical porous particles comprises the following steps:

(1) dispersing the fiber matrix polymer and the spherical porous particle additive into a solvent according to the using amount, heating and stirring until the fiber matrix polymer is dissolved in the solvent, and uniformly dispersing the spherical porous particles in the solution to obtain uniform spinning solution; wherein the heating temperature is 30-95 ℃, preferably 50-95 ℃, and more preferably 70-95 ℃;

(2) preparing corresponding coagulating baths corresponding to the adopted polymers and solvents;

(3) extruding the spinning solution into a coagulating bath through a wet spinning machine or a peristaltic pump and the like, coagulating, drying and collecting to obtain nascent fiber;

(4) and stretching the nascent fiber to obtain the bionic fiber with the spindle knot structure distributed at intervals.

Preferably after the above steps, comprising: (5) putting the bionic fiber in a cross-linking solution for a certain time; and (4) washing, drying and collecting to obtain the fiber. The crosslinking process can change the water resistance of the fiber, but does not affect the basic physical structure of the fiber, namely the spindle knot structure distributed at intervals, so the crosslinking process is a selection process and does not affect the practical application of the fiber.

In particular, the amount of the solvent to be used,

in the step (1), the amount of the fiber matrix polymer is 5 to 50 parts by weight, preferably 10 to 40 parts by weight, and more preferably 10 to 25 parts by weight, based on 100 parts by weight of the solvent; the amount of the spherical porous particles is 1 to 49 parts by weight, preferably 3 to 40 parts by weight, more preferably 5 to 30 parts by weight, and still more preferably 5 to 25 parts by weight, based on 100 parts by weight of the fiber base polymer.

In the step (1), the solvent may be any common wet spinning solvent corresponding to the polymer used, and may be at least one selected from 1, 4-dioxane, N-dimethylformamide, tetrahydrofuran, water and sulfuric acid, and more preferably at least one selected from N, N-dimethylformamide and 1, 4-dioxane.

In the step (2), the coagulation bath can be any common wet spinning coagulation bath corresponding to the used fiber matrix polymer. The mixing process can adopt any existing liquid-liquid mixing equipment, such as mechanical stirring, ultrasonic dispersion and the like. The coagulating bath can be at least one or mixed solvent of sodium sulfate aqueous solution, methanol, ethyl acetate, water, 1, 4-dioxane and N, N-dimethylformamide, preferably at least one or mixed solvent of sodium sulfate aqueous solution, methanol, water, 1, 4-dioxane and N, N-dimethylformamide; the concentration of the sodium sulfate aqueous solution is 300-500 g/L, preferably 350-450 g/L.

If the aqueous solution of polyvinyl alcohol is selected as the spinning solution, at least one of aqueous solution of sodium sulfate, methanol and ethyl acetate can be selected as the coagulating bath, wherein the concentration of the aqueous solution of sodium sulfate is 300-500 g/L, preferably 350-450 g/L; preferably at least one of sodium sulfate aqueous solution and methanol; more preferably an aqueous solution of sodium sulphate. If a1, 4-dioxane solution of polyvinyl alcohol is selected as a spinning stock solution, at least one of methanol and ethyl acetate or a binary solution consisting of methanol and 1, 4-dioxane can be selected as a coagulating bath, wherein the 1, 4-dioxane content is 0.1-50 parts by weight, preferably 5-40 parts by weight, more preferably 10-30 parts by weight based on 100 parts by weight of methanol; preferably methanol or a binary solution consisting of methanol and 1, 4-dioxane; more preferably methanol.

When the spinning solution is used for spinning, the spinneret orifices can be commonly used in the spinning process, and the inner diameter of each spinneret orifice can be 10-1000 micrometers, preferably 50-500 micrometers, and more preferably 50-300 micrometers; the filament receiving rate can be 0.01-100 meters per minute, preferably 0.05-10 meters per minute, and more preferably 0.1-1 meter per minute.

In the step (4), the drawing temperature may be a drawing temperature commonly used for the fiber matrix polymer. If polyvinyl alcohol is adopted as the fiber matrix polymer, the stretching temperature is 100-220 ℃, preferably 120-200 ℃, and more preferably 150-180 ℃.

In the step (5), the crosslinking solution may be a common wet spinning crosslinking solution corresponding to the used fiber matrix polymer.

If polyvinyl alcohol is used as the fiber matrix polymer, the crosslinking solution can be composed of a solution of acids and aldehydes and/or sodium sulfate and water, i.e., the crosslinking solution is an aqueous solution of acids and aldehydes, optionally with the addition of sodium sulfate. The acid can be common inorganic acid, preferably at least one of hydrochloric acid and sulfuric acid, and more preferably sulfuric acid; the aldehyde is preferably at least one of formaldehyde and glutaraldehyde. Specifically, the cross-linking liquid is preferably an aqueous solution of sulfuric acid, glutaraldehyde (or formaldehyde), sodium sulfate and water, wherein the concentration of the sulfuric acid can be 100-500 grams per liter, and is preferably 200-350 grams per liter; the concentration of the glutaraldehyde can be 1-80 grams per liter, and preferably 30-60 grams per liter; the concentration of formaldehyde can be 1-50 grams per liter, and preferably 20-35 grams per liter; the concentration of sodium sulfate can be 0-350 g/L, preferably 50-200 g/L.

According to the spider silk-like polymer fiber based on the spherical porous particles and the preparation method thereof, water vapor is condensed on the surface of the fiber of the obtained artificial fiber under the condition of high humidity, and then small liquid drops are combined to a spindle knot structure part and are accelerated to be converged to form large water drops, so that the collection is facilitated.

The invention has the advantages that:

(1) the invention uses the spherical porous particles as the additive, solves the problem that the interface interaction between the additive and the matrix material is weak: the porous particles are firmly bound in the fibers through the reticular microfibers formed in the solidification process, so that the influence of the additive on the mechanical properties of the fibers is weakened;

(2) the method has simple process, can be realized by adopting the traditional spinning equipment without additionally adding additional equipment, and is suitable for continuous large-scale preparation;

(3) the spider silk-like fiber with the spindle knot structures distributed at intervals is low in cost and good in stability;

(4) the spider silk-like fiber with the spindle knot structures distributed at intervals can be used for collecting water drops in air in islands, coastal deserts, foggy mountainous areas and other areas and dispersing dense fog around airport and other special places.

Drawings

FIG. 1 is a photomicrograph of a spider silk-like polymer fiber based on spherical porous particles made in example 1;

FIG. 2 is a photomicrograph of a spider silk-like polymer fiber based on spherical porous particles produced in example 8.

Fig. 1 shows that the fiber has a periodic spindle knot structure, the dark part of the spindle knot is the silica microsphere, the light transmittance is weak, and the formation of the spindle knot is the influence of the microsphere.

Fig. 2 shows that the fibers form spindle knot structures in the presence of polystyrene microspheres, the darker spherical portions in the picture have weaker light transmission, and the formation of spindle knots is the effect of the microspheres.

Detailed Description

The present invention will be further described with reference to the following examples. However, the present invention is not limited to these examples.

The experimental data in the examples were measured using the following instruments and methods:

(1) experiment basic equipment: the extrusion equipment was a model SPLab01 peristaltic pump manufactured by baodinchen pump company ltd, and the thermal stretching equipment was an INSTRON 3366 universal tester.

(2) Experimental data determination apparatus: in the experiment, a microscope photograph was taken with a NIKON ECLIPSE lC100N POL type microscope, and the directional movement of the water droplets on the fiber surface was observed with a contact angle measuring apparatus model SCA20 from Dataphysics, Germany.

The Tensile properties of the fibers were measured by the monofilament method in accordance with ASTM D3379-1975 Standard Test method for Tensile Strength and Young's Module for High-Module Single-fiber materials.

Example 1

7 g of polyvinyl alcohol (PVA1799, avastin with a polymerization degree of 1700 and an alcoholysis degree of 99%) and 1.05 g of porous silica microspheres were dispersed in 43 g of 1, 4-Dioxane (DMSO), and heated and stirred at 80 ℃ for 2 hours to obtain a uniform spinning dope. Extruding the spinning solution into methanol for spinning through a peristaltic pump at room temperature: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.1 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; hot-stretching at 180 ℃ to 8 times of the original length to obtain spider silk-like fibers, and testing, wherein the test result is shown in figure 1. The diameter of the main body of the obtained fiber is 27 micrometers, the radial height of spindle joints is 40-70 micrometers, the axial length is 50-400 micrometers, and the distance between the spindle joints is 70-2000 micrometers. The fiber is tested for mechanical property, and the tensile breaking strength is 342 +/-22 MPa.

The preparation method of the silica porous microsphere comprises the following steps: 1kg of silicone rubber latex (model 302, new material science and technology ltd, beijing porl) with a solid content of 28% is placed in a container, 15g of isooctyl acrylate is dropwise added under stirring, stirring is continued for one hour after the dropwise addition is completed, then a cobalt source is used for irradiation, the dose is 2.5Mrad, the dose rate is 50Gy/min, the irradiated latex is spray-dried by a spray dryer, the inlet temperature of the spray dryer is 140-160 ℃, the outlet temperature is 60-70 ℃, the dried silicone rubber powder is collected, and after being calcined at 600 ℃ for 6 hours (sequentially in an oxygen-free environment for 3 hours and an oxygen environment for 3 hours), the silicon dioxide porous microspheres with the particle size of 20-50 micrometers, the pore size of 20-100 nanometers and the porosity of 20-60% are obtained by screening.

Comparative example 1

7 g of polyvinyl alcohol (PVA1799, Allantin, degree of polymerization 1700, degree of alcoholysis 99%) and 0.7 g of carboxylated styrene-butadiene spray-dried powder rubber were dispersed in 43 g of 1, 4-Dioxane (DMSO), and heated and stirred at 80 ℃ for 2 hours to obtain a uniform spinning dope. The spinning dope was extruded into a coagulation bath (a mixed solution of methanol and DMSO, based on 100 parts by weight of methanol, and DMSO20 parts by weight) by a peristaltic pump at room temperature to spin: the actual extrusion rate was 0.01 ml per minute, the spinneret size was 25G (round, 260 micron diameter), the take-up rate was 0.42 meters per minute, and the fibers were in the coagulation bath for at least 5 minutes. And fully drying the obtained fibers in the air, collecting to obtain the spider silk-like polymer fibers, and testing the mechanical properties of the spider silk-like polymer fibers, wherein the tensile breaking strength of the spider silk-like polymer fibers is 94 +/-12 MPa.

The preparation method of the carboxylic styrene-butadiene spray-dried powder rubber comprises the following steps: 1kg of carboxylated styrene-butadiene latex with 50 percent of solid content, Yanshan petrochemical production, the brand XSBRL-54B1, is placed in a container, 15g of isooctyl acrylate is dropwise added under stirring, the stirring is continued for one hour after the dropwise addition is finished, then a cobalt source is used for irradiation, the dosage is 2.5Mrad, the dosage rate is 50Gy/min, the irradiated latex is spray-dried by a spray dryer, the inlet temperature of the spray dryer is 140-160 ℃, the outlet temperature is 60-70 ℃, the dried carboxylated styrene-butadiene rubber powder is collected, and the sample of the carboxylated styrene-butadiene rubber powder with the average particle size of 30 microns is obtained by screening and is used in the comparative example.

Comparative example 2

7 g of polyvinyl alcohol (PVA1799, Allantin, degree of polymerization 1700, degree of alcoholysis 99%) and 2.1 g of carboxylated styrene-butadiene spray-dried powder rubber (same as in comparative example 1) were dispersed in 43 g of 1, 4-Dioxane (DMSO) and heated and stirred at 80 ℃ for 2 hours to obtain a homogeneous dope. The spinning dope was extruded into a coagulation bath (a mixed solution of methanol and DMSO, 20 parts by weight of DMSO based on 100 parts by weight of methanol) by a peristaltic pump at room temperature to carry out spinning: the actual extrusion rate was 0.01 ml per minute, the spinneret size was 25G (round, 260 micron diameter), the take-up rate was 0.42 meters per minute, and the fibers were in the coagulation bath for at least 5 minutes. And fully drying the obtained fibers in the air, collecting to obtain the spider silk-like polymer fibers, and testing the mechanical properties of the spider silk-like polymer fibers to obtain the spider silk-like polymer fibers with the tensile breaking strength of 36 +/-6 MPa.

Comparative example 3

7 g of polyvinyl alcohol (PVA1799, Allantin with a polymerization degree of 1700 and an alcoholysis degree of 99%) and 1.4 g of glass microspheres (obtained from Wallace chemical engineering Co., Ltd., Suzhou, non-porous solid glass microspheres, 15-30 microns) were dispersed in 43 g of 1, 4-Dioxane (DMSO), and heated and stirred at 80 ℃ for 2 hours to obtain a uniform spinning dope. The spinning dope was extruded into a coagulation bath (a mixed solution of methanol and DMSO, 20 parts by weight of DMSO based on 100 parts by weight of methanol) by a peristaltic pump at room temperature to carry out spinning: the actual extrusion rate was 0.01 ml per minute, the spinneret size was 25G (round, 260 micron diameter), the take-up rate was 0.42 meters per minute, and the fibers were in the coagulation bath for at least 5 minutes. And fully drying the obtained fibers in the air, collecting to obtain the spider silk-like polymer fibers, and testing the mechanical properties of the spider silk-like polymer fibers to obtain the spider silk-like polymer fibers with tensile breaking strength of 54 +/-10 MPa.

Example 2

7 g of polyvinyl alcohol (PVA1799, Allantin, degree of polymerization 1700, degree of alcoholysis 99%) and 2.1 g of porous silica microspheres (same as in example 1) were dispersed in 43 g of 1, 4-Dioxane (DMSO), and heated and stirred at 80 ℃ for 2 hours to obtain a uniform spinning dope. Extruding the spinning solution into methanol for spinning through a peristaltic pump at room temperature: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.1 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; and hot-drawing at 180 ℃ to 8 times of the original length to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 27 micrometers, the radial height of spindle joints is 40-75 micrometers, the axial length is 50-400 micrometers, and the distance between the spindle joints is 60-1000 micrometers. The fiber is tested for mechanical property, and the tensile breaking strength is 154 +/-15 MPa.

Observed by a contact angle measuring instrument, the surface of the fiber randomly forms small drops under the condition of high humidity, and then the drops directionally move from the periphery of the spindle structure to the central bulge to form large drops.

Example 3

6 g of polyvinyl alcohol (PVA 2499, Allantin, degree of polymerization 2400, degree of alcoholysis 99%), 0.9 g of porous silica microspheres (same as in example 1) were dispersed in 44 g of 1, 4-Dioxane (DMSO), and heated and stirred at 80 ℃ for 3 hours to obtain a uniform spinning dope. Extruding the spinning solution into methanol for spinning through a peristaltic pump at room temperature: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.1 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; and hot-drawing at 180 ℃ to 6 times of the original length to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 25 micrometers, the radial height of spindle joints is 35-80 micrometers, the axial length is 50-450 micrometers, and the interval between the spindle joints is 70-2000 micrometers.

Example 4

6 g of polyvinyl alcohol (PVA 2499, Allantin, degree of polymerization 2400, degree of alcoholysis 99%), 0.9 g of porous silica microspheres (same as in example 1) were dispersed in 44 g of 1, 4-Dioxane (DMSO), and heated and stirred at 80 ℃ for 2 hours to obtain a uniform spinning dope. The spinning dope was extruded into a coagulation bath (a mixed solution of methanol and DMSO, 20 parts by weight of DMSO based on 100 parts by weight of methanol) by a peristaltic pump at room temperature to carry out spinning: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.4 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; and hot-drawing at 180 ℃ to 12 times of the original length to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 15 micrometers, the radial height of spindle joints is 40-70 micrometers, the axial length is 50-350 micrometers, and the interval between the spindle joints is 90-2000 micrometers.

Example 5

7 g of polyvinyl alcohol (PVA1799, Allantin, degree of polymerization 1700, degree of alcoholysis 99%) and 1.05 g of porous silica microspheres (same as in example 1) were dispersed in 43 g of 1, 4-Dioxane (DMSO), and heated and stirred at 70 ℃ for 4 hours to obtain a uniform spinning dope. Extruding the spinning solution into methanol for spinning through a peristaltic pump at room temperature: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.1 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; after hot-drawing at 180 ℃ to 8 times the original length, the resultant was placed in a crosslinking solution (11.48 g of 98% concentrated sulfuric acid, 3.5 g of sodium sulfate, 4.16 g of 50% glutaraldehyde aqueous solution, and 50 ml of aqueous solution obtained by constant volume) for 10 minutes. And (5) washing, drying and collecting to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 27 micrometers, the radial height of spindle joints is 40-70 micrometers, the axial length is 50-400 micrometers, and the distance between the spindle joints is 70-2000 micrometers.

Example 6

6 g of polyvinyl alcohol (PVA 1788, aladine, polymerization degree 1700 and alcoholysis degree 88%) and 0.9 g of carbon porous microspheres were dispersed in 44 g of 1, 4-Dioxane (DMSO), and heated and stirred at 80 ℃ for 2 hours to obtain a uniform spinning dope. Extruding the spinning solution into methanol for spinning through a peristaltic pump at room temperature: the actual extrusion rate was 0.012 milliliters per minute, the spinneret size was 30G (diameter 180 microns), the take-up rate was 0.3 meters per minute, and the fibers were in the coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; and hot-drawing at 180 ℃ to 10 times of the original length to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 15 micrometers, the radial height of spindle joints is 20-40 micrometers, the axial length is 50-200 micrometers, and the space between the spindle joints is 200-2500 micrometers.

The preparation method of the carbon porous microsphere comprises the following steps: 105 g of styrene-acrylic latex which is subjected to irradiation crosslinking and has a solid content of 47% is subjected to Yanshan petrochemical production, the styrene-acrylic latex is placed in a container, 4.95 g of pyrrole and 72 ml of polyvinylpyrrolidone (6 g) aqueous solution are added under stirring, 48 ml of ferric chloride hexahydrate (0.03 g) aqueous solution, 240 ml of p-toluenesulfonic acid (7.02 g) aqueous solution and 360 ml of hydrogen peroxide (12.54 g) aqueous solution are slowly added after dropwise addition, ice-water bath stirring is continued for 48 hours, spray drying is performed through a spray dryer, the inlet temperature of the spray dryer is 140-160 ℃, the outlet temperature is 60-70 ℃, dried polypyrrole-styrene-acrylic powdered rubber is collected, carbonization is performed at 600 ℃ for 3 hours, and a carbon porous microsphere sample with a particle size of 5-30 micrometers, a pore size of 5-10 angstroms and a porosity of 30-40% is obtained through screening.

Example 7

6 g of polyvinyl alcohol (PVA 1788, aladine with the polymerization degree of 1700 and the alcoholysis degree of 88%), 0.9 g of polystyrene porous microspheres (IPE-PST30, purchased from the national center for research on biochemical engineering technology, the average particle size of 30 microns, the pore diameter of 20-120 nm and the porosity of 20-50%) are dispersed in 44 g of 1, 4-Dioxane (DMSO), and the mixture is heated and stirred for 2 hours at 80 ℃ to obtain uniform spinning stock solution. Extruding the spinning solution into methanol for spinning through a peristaltic pump at room temperature: actual extrusion rate 0.01 ml per minute, spinneret size 30G (diameter 180 microns), take-up rate 0.4 meters per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; and hot-drawing at 180 ℃ to 12 times of the original length to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 15 micrometers, the radial height of spindle joints is 35-50 micrometers, the axial length is 50-300 micrometers, and the distance between the spindle joints is 200-2700 micrometers.

Example 8

7 g of polyvinyl alcohol (PVA1799, aladine, the degree of polymerization is 1700, the degree of alcoholysis is 99%) and 1.05 g of porous polystyrene microspheres (purchased from glow organisms, the average particle size is 60 microns, the pore diameter is 20-50 nanometers, the porosity is 20-30%) are dispersed in 43 g of 1, 4-Dioxane (DMSO), and the uniform spinning solution is obtained by heating and stirring at 70 ℃ for 4 hours. Extruding the spinning solution into methanol for spinning through a peristaltic pump at room temperature: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.1 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; after hot-drawing at 180 ℃ to 8 times the original length, the resultant was placed in a crosslinking solution (11.48 g of 98% concentrated sulfuric acid, 3.5 g of sodium sulfate, 4.16 g of 50% glutaraldehyde aqueous solution, and 50 ml of aqueous solution obtained by constant volume) for 10 minutes. Washing with water, drying, collecting to obtain spider silk-like fiber, and testing, with the test result shown in figure 2. The diameter of a main body of the obtained fiber is 27 micrometers, the radial height of spindle joints is 70-90 micrometers, the axial length is 110-480 micrometers, and the distance between the spindle joints is 90-2400 micrometers.

Example 9

8 g of polyvinyl alcohol (PVA1799, aladine, the degree of polymerization is 1700, the degree of alcoholysis is 99%) and 1.2 g of polystyrene porous microspheres (purchased from glow organisms, the average particle size is 60 microns, the pore diameter is 20-50 nanometers, the porosity is 20-30%) are dispersed in 42 g of 1, 4-Dioxane (DMSO), and the mixture is heated and stirred for 2 hours at 90 ℃ to obtain a uniform spinning solution. Extruding the spinning solution into methanol for spinning through a peristaltic pump at room temperature: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.1 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; and hot-drawing at 180 ℃ to 8 times of the original length to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 28 micrometers, the radial height of spindle joints is 70-90 micrometers, the axial length is 100-400 micrometers, and the distance between the spindle joints is 70-3000 micrometers.

Example 10

8 g of polyvinyl alcohol (PVA 2499, aladine, the degree of polymerization 2400, the degree of alcoholysis 99%) and 1.2 g of polystyrene porous microspheres (purchased from Calamine Bio, the average particle size is 80 microns, the pore diameter is 20-50 nanometers, the porosity is 20-30%) are dispersed in 42 g of water, and the mixture is heated and stirred for 2 hours at 90 ℃ to obtain a uniform spinning solution. The spinning dope was extruded into a coagulation bath (aqueous sodium sulfate solution, 420g/L) by a peristaltic pump at room temperature to spin: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.1 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; and hot-drawing at 180 ℃ to 8 times of the original length to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 27 micrometers, the radial height of spindle joints is 90-140 micrometers, the axial length is 150-450 micrometers, and the distance between the spindle joints is 70-3000 micrometers.

Example 11

10 g of polyacrylonitrile (purchased from Sigma-Aldrich Sigma Aldrich trade Co., Ltd., weight average molecular weight of 150000) and 1.5 g of porous silica microspheres (same as in example 1) were dispersed in 40 g of N, N-Dimethylformamide (DMF), and heated and stirred at 60 ℃ for 3 hours to obtain a uniform dope. The spinning stock solution was extruded into a coagulation bath (a mixed solution of water and DMF in 100 parts by weight of water, DMF50 parts by weight) by a peristaltic pump at room temperature to spin: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.1 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; and hot-drawing the fiber to 8 times of the original length at 95 ℃ to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 25 micrometers, the radial height of spindle joints is 40-80 micrometers, the axial length is 80-380 micrometers, and the interval between the spindle joints is 90-2600 micrometers.

Example 12

10 g of polyacrylonitrile (purchased from Sigma-Aldrich Sigma Aldrich trade company, Inc., with a weight average molecular weight of 150000) and 1.5 g of porous polystyrene microspheres (purchased from Caligite, with an average particle size of 60 μm, a pore size of 20-50 nm, and a porosity of 20-30%) were dispersed in 40 g of N, N-Dimethylformamide (DMF), and heated and stirred at 60 ℃ for 3 hours to obtain a uniform spinning dope. The spinning stock solution was extruded into a coagulation bath (a mixed solution of water and DMF in 100 parts by weight of water, DMF50 parts by weight) by a peristaltic pump at room temperature to spin: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.1 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; and hot-drawing the fiber to 8 times of the original length at 95 ℃ to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 25 micrometers, the radial height of spindle joints is 70-95 micrometers, the axial length is 120-400 micrometers, and the space between the spindle joints is 100-2800 micrometers.

Example 13

7 g of polyvinyl alcohol (PVA1799, Allantin, degree of polymerization 1700, degree of alcoholysis 99%) and 0.35 g of porous silica microspheres (same as in example 1) were dispersed in 43 g of 1, 4-Dioxane (DMSO), and heated and stirred at 80 ℃ for 2 hours to obtain a uniform spinning dope. Extruding the spinning solution into methanol for spinning through a peristaltic pump at room temperature: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.1 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; and hot-drawing at 180 ℃ to 10 times of the original length to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 24 micrometers, the radial height of spindle sections is 37-70 micrometers, the axial length is 50-350 micrometers, and the space between the spindle sections is 200-4000 micrometers.

Example 14

7 g of polyvinyl alcohol (PVA1799, aladine with the polymerization degree of 1700 and the alcoholysis degree of 99%) and 2.8 g of polystyrene porous microspheres (IPE-PST30, purchased from the national center for research on biochemical engineering technology, the average particle size of 30 microns, the pore diameter of 20-120 nm and the porosity of 20-50%) are dispersed in 43 g of 1, 4-Dioxane (DMSO), and the mixture is heated and stirred for 2 hours at 80 ℃ to obtain a uniform spinning stock solution. Extruding the spinning solution into methanol for spinning through a peristaltic pump at room temperature: actual extrusion rate 0.02 ml per minute, spinneret size 25G (260 micron diameter), take-up rate 0.1 meter per minute, fiber in coagulation bath for at least 5 minutes; fully drying and collecting to obtain nascent fiber; and (4) performing hot drawing at 180 ℃ to 8 times of the original length to obtain the spider silk-like fiber, and testing. The diameter of the main body of the obtained fiber is 25 micrometers, the radial height of spindle joints is 41-76 micrometers, the axial length is 80-510 micrometers, and the interval between the spindle joints is 70-1100 micrometers.

Example 15

10 g of polyurethane (purchased from Shandongteng engineering plastics Co., Ltd.) and 1.5 g of porous silica microspheres (same as in example 1) were dispersed in 30g of N, N-Dimethylformamide (DMF), and heated and stirred at 80 ℃ for 2 hours to obtain a uniform spinning dope. The spinning stock solution was extruded into a coagulation bath (a mixed solution of water and DMF in 100 parts by weight of water, DMF40 parts by weight) by a peristaltic pump at room temperature to spin: the actual extrusion rate was 0.01 ml per minute, the spinneret size was 25G (260 micron diameter), the take-up rate was 0.4 meter per minute, and the fibers were in the coagulation bath for at least 5 minutes. Fully drying and collecting to obtain nascent fiber; stretching to 10 times of the original length to obtain the spider silk-like fiber. The diameter of the main body of the obtained fiber is 26 micrometers, the radial height of spindle joints is 35-77 micrometers, the axial length is 60-400 micrometers, and the interval between the spindle joints is 220-2600 micrometers.

Claims

1. A spider silk-like polymer fiber based on spherical porous particles is characterized in that a monofilament of the polymer fiber has a microstructure of spider silk-like fibers with spindle knot structural units distributed at intervals, and the radial height of the spindle knot structural units is 10-300 microns; the axial length of the spindle section structural unit is 10-1000 microns; the distance between the spindle section structural units is 10-5000 micrometers;

the polymer fiber comprises the following components in parts by weight:

a. 100 parts of fiber matrix polymer;

b. 1-49 parts by weight of spherical porous particles;

the average particle size of the spherical porous particles is 0.5-200 microns;

the porosity of the spherical porous particles is 10-80%, and the pore diameter of the spherical porous particles is 0.1-200 nm.

2. A spherical porous particle-based spider silk-like polymer fiber according to claim 1, characterized in that:

the radial height of the spindle section structural unit is 20-200 microns; the axial length of the spindle section structure unit is 20-700 micrometers; the interval between the spindle section structural units is 50-3000 microns; and/or the presence of a gas in the gas,

the polymer fiber comprises the following components in parts by weight:

a. 100 parts of fiber matrix polymer;

b. 3-40 parts of spherical porous particles; and/or the presence of a gas in the gas,

the average particle size of the spherical porous particles is 10-150 micrometers; and/or the presence of a gas in the gas,

the porosity of the spherical porous particles is 20-60%; and/or the presence of a gas in the gas,

the aperture of the spherical porous particles is 0.5-150 nm; and/or the presence of a gas in the gas,

the diameter of the polymer fiber main body is 5-250 micrometers.

3. A spherical porous particle-based spider silk-like polymer fiber according to claim 2, characterized in that:

the radial height of the spindle section structural unit is 30-150 micrometers; the axial length of the spindle section structural unit is 100-300 microns; the distance between the spindle section structural units is 100-1000 microns; and/or the presence of a gas in the gas,

the polymer fiber comprises the following components in parts by weight:

a. 100 parts of fiber matrix polymer;

b. 5-30 parts by weight of spherical porous particles; and/or the presence of a gas in the gas,

the average particle size of the spherical porous particles is 20-100 microns; and/or the presence of a gas in the gas,

the porosity of the spherical porous particles is 20-50%; and/or the presence of a gas in the gas,

the aperture of the spherical porous particles is 1-50 nm; and/or the presence of a gas in the gas,

the diameter of the polymer fiber main body is 10-150 micrometers.

4. A spherical porous particle-based spider silk-like polymer fiber according to claim 3, characterized in that:

the polymer fiber comprises the following components in parts by weight:

a. 100 parts of fiber matrix polymer;

b. 5-25 parts by weight of spherical porous particles; and/or the presence of a gas in the gas,

the diameter of the polymer fiber main body is 20-50 micrometers.

5. A spherical porous particle-based spider silk-like polymer fiber according to claim 1, characterized in that:

the spherical porous particles are selected from at least one of silicon dioxide porous microspheres, polystyrene porous microspheres, calcium carbonate porous microspheres, epoxy resin porous microspheres, polylactic acid porous microspheres, phenolic resin porous microspheres, chitosan porous microspheres, carbon porous microspheres, hydroxyapatite porous microspheres, gelatin porous microspheres and metal porous microspheres.

6. A spherical porous particle-based spider silk-like polymer fiber according to claim 1, characterized in that:

the fiber matrix polymer is at least one selected from polyacrylonitrile, polyurethane, polyvinyl alcohol, viscose fiber, nylon, cellulose sulfonate, cellulose acetate, polyvinyl chloride, polyisophthaloyl amide, polyisophthaloyl metaphenylene diamine and poly terephthaloyl p-phenylenediamine.

7. A spherical porous particle-based spider silk-like polymer fiber according to claim 1, characterized in that:

the fiber matrix polymer is selected from polyvinyl alcohol; the polymerization degree of the polyvinyl alcohol is 400-4000; the alcoholysis degree is 55-99%.

8. A spherical porous particle-based spider silk-like polymer fiber according to claim 7, characterized in that:

the polymerization degree of the polyvinyl alcohol is 500-3000; the alcoholysis degree is 88-99%.

9. A spherical porous particle-based spider silk-like polymer fiber according to claim 8, characterized in that:

the polymerization degree of the polyvinyl alcohol is 1000-2500.

10. A spider silk-like polymer fiber based on spherical porous particles according to any one of claims 1 to 9, prepared by a method comprising the steps of:

(1) dispersing the fiber matrix polymer and the spherical porous particle additive into a solvent according to the using amount, heating and stirring until the fiber matrix polymer is dissolved in the solvent, and uniformly dispersing the spherical porous particles in the solution to obtain uniform spinning solution;

(2) preparing corresponding coagulating baths;

(3) extruding the spinning solution into a coagulating bath, coagulating, drying and collecting to obtain nascent fiber;

(4) by drawing the nascent fiber, spider silk-like polymer fiber with spindle knot structure distributed at intervals is obtained.

11. A method for preparing a spider silk-like polymer fiber based on spherical porous particles according to any one of claims 1 to 10, characterized by comprising the steps of:

(1) dispersing the fiber matrix polymer and the spherical porous particles in a solvent according to the dosage, heating and stirring until the fiber matrix polymer is dissolved in the solvent, and uniformly dispersing the spherical porous particles in the solution to obtain a spinning solution;

(2) preparing corresponding coagulating baths;

(4) and stretching the nascent fiber to obtain the spider silk-like polymer fiber.

12. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 11, characterized in that:

in the step (1), the amount of the fiber matrix polymer is 5-50 parts by weight based on 100 parts by weight of the solvent; and/or the presence of a gas in the gas,

in the step (1), the solvent is at least one selected from 1, 4-dioxane, N-dimethylformamide, tetrahydrofuran, water and sulfuric acid; and/or the presence of a gas in the gas,

in the step (1), the heating temperature is 30-95 ℃.

13. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 12, characterized in that:

in the step (1), the amount of the fiber matrix polymer is 10-40 parts by weight based on 100 parts by weight of the solvent; and/or the presence of a gas in the gas,

in the step (1), the heating temperature is 50-95 ℃.

14. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 13, characterized in that:

in the step (1), the amount of the fiber matrix polymer is 10-25 parts by weight based on 100 parts by weight of the solvent; and/or the presence of a gas in the gas,

in the step (1), the heating temperature is 70-95 ℃.

15. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 11, characterized in that:

in the step (2), the coagulating bath is at least one or a mixed solvent selected from sodium sulfate aqueous solution, methanol, ethyl acetate, water, 1, 4-dioxane and N, N-dimethylformamide; the concentration of the sodium sulfate aqueous solution is 300-500 g/L.

16. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 15, characterized in that:

the concentration of the sodium sulfate aqueous solution is 350-450 g/L.

17. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 11, characterized in that:

the fiber matrix polymer is polyvinyl alcohol, the solvent is 1, 4-dioxane, and the coagulating bath is at least one selected from binary solutions consisting of methanol, ethyl acetate, methanol and 1, 4-dioxane; in the binary solution composed of methanol and 1, 4-dioxane, the weight portion of the 1, 4-dioxane is 0.1-50 parts based on 100 parts of methanol.

18. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 17, characterized in that:

in the binary solution composed of methanol and 1, 4-dioxane, the weight portion of the 1, 4-dioxane is 5-40 parts based on 100 parts of methanol.

19. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 18, characterized in that:

in the binary solution composed of methanol and 1, 4-dioxane, the weight portion of the 1, 4-dioxane is 10-30 parts based on 100 parts of methanol.

20. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 11, characterized in that:

when the spinning solution is used for spinning, the inner diameter of a spinneret orifice is 10-1000 microns; and/or the presence of a gas in the gas,

and when the spinning solution is used for spinning, the yarn collecting speed is 0.01-100 meters per minute.

21. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 20, characterized in that:

when the spinning solution is used for spinning, the inner diameter of the spinneret orifice is 50-500 microns; and/or the presence of a gas in the gas,

and when the spinning solution is used for spinning, the yarn collecting speed is 0.05-10 meters per minute.

22. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 21, characterized in that:

when the spinning solution is used for spinning, the inner diameter of the spinneret orifice is 50-300 microns; and/or the presence of a gas in the gas,

and when the spinning solution is used for spinning, the yarn collecting speed is 0.1-1 meter per minute.

23. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 11, characterized in that:

in the step (4), the fiber matrix polymer is polyvinyl alcohol, and the stretching temperature is 100-220 ℃.

24. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 23, characterized in that:

in the step (4), the stretching temperature is 120-200 ℃.

25. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 24, characterized in that:

in the step (4), the stretching temperature is 50-180 ℃.

26. The method for preparing a spider silk-like polymer fiber based on spherical porous particles according to any one of claims 11 to 25, further comprising the steps of:

and (4) soaking the fiber prepared in the step (4) in a crosslinking solution, washing with water, drying and collecting to obtain the fiber.

27. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 26, characterized in that:

the fiber matrix polymer is polyvinyl alcohol, and the crosslinking liquid is a solution of acids and aldehydes, and/or sodium sulfate and water; the acid is inorganic acid; the aldehyde is at least one of formaldehyde and glutaraldehyde.

28. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 27, characterized in that:

the acid is at least one of hydrochloric acid and sulfuric acid.

29. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 27, characterized in that:

the acid in the crosslinking liquid is selected from sulfuric acid, and the aldehyde is selected from glutaraldehyde and formaldehyde; wherein:

the concentration of the sulfuric acid is 100-500 g/L;

the concentration of the glutaraldehyde is 1-80 grams per liter;

the concentration of the formaldehyde is 1-50 grams per liter;

the concentration of the sodium sulfate is 0-350 g/L.

30. The method of preparing a spider silk-like polymer fiber based on spherical porous particles according to claim 29, characterized in that:

the concentration of the sulfuric acid is 200-350 g per liter; and/or the presence of a gas in the gas,

the concentration of the glutaraldehyde is 30-60 grams per liter; and/or the presence of a gas in the gas,

the concentration of the formaldehyde is 20-35 grams per liter; and/or the presence of a gas in the gas,

the concentration of the sodium sulfate is 50-200 grams per liter.