Preparation method of low-cost structural bead chain fiber and structural bead chain fiber prepared by preparation method

Abstract

The invention provides a preparation method of a low-cost structural bead chain fiber, which comprises the following steps: (1) bunching: bunching a fiber precursor to obtain a fiber tow; (2) gum dipping: dipping the fiber tows in resin and standing; (3) bead making: taking out the fiber tow, determining a plurality of processing positions at equal intervals in the length direction of the fiber tow, and hammering the processing positions in the direction perpendicular to the length direction of the fiber tow or extruding and dispersing the processing positions from top to bottom in the direction perpendicular to the length direction of the fiber tow; (4) curing: dipping the fiber tows in another resin, standing to form gel beads, taking out the fiber tows, curing, drying and forming; (5) cutting into sections: cutting the fiber tows into sections to form mini ribs, namely the structural bead chain fibers. The invention also provides the structural bead chain fiber prepared by the method. The structural bead chain fiber prepared by the preparation method disclosed by the invention is round in particle shape, high in forming efficiency and low in bead chain manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of cement product reinforcing fibers, and more specifically, to the technical field of bead chain fibers, and in particular to a method for preparing low-cost structural bead chain fibers and the structural bead chain fibers prepared thereby. Background Art

[0002] Existing cement products are usually reinforced with composite reinforcing fibers, and the types of composite reinforcing fibers include basalt fibers, carbon fibers, and the like.

[0003] Composite reinforcing fiber: also known as structural composite fiber, shaped like a small steel bar, also known as "mini-bar". The general preparation method is to wind and bond the fiber raw filaments, twist, resin impregnate, dry, and cut into sections. Its bond strength in concrete products can be provided by three aspects: chemical bonding, mechanical friction and mechanical anchoring.

[0004] Traditional preparation method of composite reinforced fiber: Taking basalt fiber as an example, basalt fiber is a continuous fiber made by drawing after melting basalt ore at high temperature. It has excellent properties such as high strength, heat resistance and corrosion resistance. The traditional preparation method of basalt fiber (including twisting) mainly involves the following steps:

[0005] 01 Raw material preparation Basalt ore with stable chemical composition is selected as raw material to ensure the consistency of fiber performance.

[0006] 02 Melting: Melt the basalt ore at a high temperature of 1450℃~1500℃ to form a uniform melt.

[0007] 03 The molten wire is drawn through a platinum-rhodium alloy plate and drawn into thin wires by a high-speed wire drawing machine to obtain basalt fiber raw wire.

[0008] 04Twisting The basalt fiber raw yarn is twisted by a twisting machine to form a textile yarn with a certain twist. Twisting can improve the compactness and strength of the fiber bundle, increase the friction between fibers, and improve the stability and performance of the yarn.

[0009] 05 Post-treatment The twisted basalt fiber yarn may need to undergo post-treatment processes such as dipping and drying to enhance its performance in specific applications.

[0010] 06 Short-cut In some applications, such as reinforcing concrete, the twisted basalt fiber yarn will be chopped to form short-cut fibers.

[0011] 07 Surface modification In order to improve the bonding between basalt fiber and other materials, surface modification treatment may be carried out, such as coating modification technology, to improve its mechanical properties and environmental anti-aging properties.

[0012] Insufficient traditional materials: When fiber-reinforced cement products are subjected to external forces, the composite reinforcing fibers are prone to slippage and cannot coordinate with the deformation of the cement matrix. The high-strength composite reinforcing fibers (basalt fibers, carbon fibers, etc.) prepared by this synthesis method mostly fail in the form of "pull-out failure", far from reaching the tensile strength, and can only improve the post-crack performance of cement products.

[0013] In order to further strengthen cement products, a new type of structural bead chain fiber material has emerged, which is formed by forming multiple beads at intervals along the length direction of continuous fibers to form a bead chain. The existing composite fiber bead chain molding technology is to add resin drop by drop at fixed points on the continuous fibers. The particles of the structural bead chain fiber prepared by this method are not round enough, the molding efficiency is low, and the bead chain manufacturing cost is high.

[0014] Therefore, it is desired to provide a method for preparing structural bead chain fibers, wherein the particles of the structural bead chain fibers prepared by the method are round, the molding efficiency is high, and the bead chain manufacturing cost is low. Summary of the invention

[0015] In order to overcome the shortcomings of the above-mentioned prior art, an object of the present invention is to provide a method for preparing low-cost structural bead chain fibers, wherein the prepared structural bead chain fibers have round particles, high molding efficiency, and low bead chain manufacturing cost, and are suitable for large-scale promotion and application.

[0016] Another object of the present invention is to provide a low-cost structural bead chain fiber, which is prepared by the above-mentioned low-cost structural bead chain fiber preparation method, has round particles, high molding efficiency, low manufacturing cost, and is suitable for large-scale promotion and application.

[0017] To achieve the above objectives, in a first aspect of the present invention, a method for preparing a low-cost structural bead chain fiber is provided, which is characterized by comprising the following steps:

[0018] (1) Bundling: Bundling fiber raw filaments to obtain fiber bundles;

[0019] (2) Dipping: dipping the fiber bundle into resin and leaving it to stand;

[0020] (3) bead making: taking out the fiber bundle, determining a plurality of processing positions on the fiber bundle, wherein the plurality of processing positions are arranged at equal distances from each other along the length direction of the fiber bundle, and hammering the processing positions along the length direction perpendicular to the fiber bundle or squeezing and dispersing the processing positions from top to bottom in the length direction perpendicular to the fiber bundle;

[0021] (4) Curing: the fiber bundle is immersed in another resin and allowed to stand to form a bead, the fiber bundle is taken out to be cured, and dried to form a shape;

[0022] (5) Cutting into segments: Cutting the fiber bundle into segments to form mini-ribs, wherein the mini-ribs are structural bead chain fibers.

[0023] Preferably, in the step (1), the specific step of bundling is: bundling the fiber filaments by spiral bonding, twisting-free or weak twisting.

[0024] Preferably, in step (2), the standing time is 5 seconds to 60 seconds.

[0025] Preferably, in step (3), the distance between two adjacent processing positions is 5 mm to 10 mm.

[0026] Preferably, in the step (3), the hammering is performed by using intermittent micro-water torrents or an electromagnetic relay hammer, and the extrusion is performed by using a rib plate.

[0027] Preferably, in step (4), the standing time is 5 seconds to 10 seconds.

[0028] Preferably, in step (4), the curing time is 5 minutes to 30 minutes, the drying temperature is 40° C. to 60° C., and the drying time is 12 hours to 48 hours.

[0029] Preferably, in step (5), the length of the mini ribs is 30 mm to 50 mm.

[0030] Preferably, the method for preparing the low-cost structural bead chain fiber further comprises:

[0031] (6) Surface modification: The surface of the mini-ribs is subjected to surface modification treatment.

[0032] In a second aspect of the present invention, a structural bead chain fiber is provided, which is characterized in that it is prepared by the above-mentioned low-cost structural bead chain fiber preparation method.

[0033] The beneficial effects of the present invention are:

[0034] 1. The method for preparing low-cost structural bead chain fibers of the present invention comprises the following steps: (1) bundling: bundling fiber raw fibers to obtain fiber bundles; (2) resin dipping: dipping the fiber bundles in resin and allowing them to stand; (3) bead making: taking out the fiber bundles, determining a plurality of processing positions on the fiber bundles, wherein the plurality of processing positions are arranged at equal distances from each other along the length direction of the fiber bundles, hammering the processing positions along the length direction perpendicular to the fiber bundles or squeezing and dispersing them from top to bottom in the length direction perpendicular to the fiber bundles; (4) solidification: dipping the fiber bundles in another resin and allowing them to stand to form resin beads, taking out the fiber bundles to solidify, and drying to form them; (5) segmentation: segmenting the fiber bundles to form mini ribs, which are structural bead chain fibers. Therefore, the structural bead chain fibers prepared by the fiber bundles have rounded particles, high molding efficiency, and low bead chain manufacturing cost, and are suitable for large-scale promotion and application.

[0035] 2. The low-cost structural bead chain fiber of the present invention is prepared by the above-mentioned preparation method of the low-cost structural bead chain fiber. The particles are round, the molding efficiency is high, the manufacturing cost is low, and it is suitable for large-scale promotion and application.

[0036] These and other objects, features and advantages of the present invention will be more fully reflected in the following detailed description and claims, and may be achieved by the means, devices and combinations thereof particularly pointed out in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A specific embodiment of the method for preparing low-cost structural bead chain fibers of the present invention is a top view schematic diagram of the shape change of a fiber bundle before and after hammer dispersion, wherein 1 is a fiber bundle; 2 is a fiber dispersion point; and 3 is a rubber bead.

[0038] Figure 2 Another specific embodiment of the method for preparing low-cost structural bead chain fibers of the present invention is a top view schematic diagram of the shape change of a fiber bundle before and after extrusion dispersion, wherein 1 is a fiber bundle; 2 is a fiber dispersion point; and 4 is a rib plate.

[0039] Figure 3 This is a photo of a spider web "reconstructed after wet", where 5 is the spider web and 6 is a water droplet. DETAILED DESCRIPTION

[0040] In order to make the particles of the prepared structural bead chain fibers round, with high molding efficiency and low bead chain manufacturing cost, the inventors have proposed a method for preparing low-cost structural bead chain fibers through in-depth and extensive research. The structural bead chain fibers prepared by the low-cost structural bead chain fiber preparation method have round particles, high molding efficiency and low bead chain manufacturing cost.

[0041] The present invention provides a method for preparing a low-cost structural bead chain fiber, comprising the following steps:

[0042] (1) Bundling: Bundling fiber raw filaments to obtain fiber bundles;

[0043] (2) Dipping: dipping the fiber bundle into resin and leaving it to stand to enhance the bonding force between the fiber strands;

[0044] (3) bead making: taking out the fiber bundle, determining a plurality of processing positions on the fiber bundle, wherein the plurality of processing positions are arranged at equal distances from each other along the length direction of the fiber bundle, and hammering the processing positions along the length direction perpendicular to the fiber bundle or squeezing and dispersing the processing positions from top to bottom in the length direction perpendicular to the fiber bundle;

[0045] (4) Curing: the fiber bundle is immersed in another resin and allowed to stand to form a bead, the fiber bundle is taken out to be cured, and dried to form a shape;

[0046] (5) Cutting into segments: Cutting the fiber bundle into segments to form mini-ribs, wherein the mini-ribs are structural bead chain fibers.

[0047] In the step (1), the bundling may be performed by any suitable specific steps. Preferably, in the step (1), the specific steps of the bundling are: bundling the fiber filaments by spiral bonding, twisting-free or weak twisting.

[0048] In the step (2), the standing time can be determined as needed. Preferably, in the step (2), the standing time is 5 seconds to 60 seconds.

[0049] In the step (3), the distance between two adjacent processing positions can be determined as needed. Preferably, in the step (3), the distance between two adjacent processing positions is 5 mm to 10 mm.

[0050] In the step (3), the hammering and the extrusion can be performed by any suitable tool. Preferably, in the step (3), the hammering is performed by intermittent micro-water torrents or an electromagnetic relay hammer, and the extrusion is performed by a rib plate.

[0051] In the step (4), the standing time can be determined as needed. Preferably, in the step (4), the standing time is 5 seconds to 10 seconds.

[0052] In the step (4), the curing time can be determined as needed. Preferably, in the step (4), the curing time is 5 minutes to 30 minutes.

[0053] In the step (4), the drying temperature and temperature can be determined as needed. Preferably, in the step (4), the drying temperature is 40°C to 60°C, and the drying time is 12 hours to 48 hours.

[0054] In the step (5), the length of the mini ribs can be determined as needed. Preferably, in the step (5), the length of the mini ribs is 30 mm to 50 mm.

[0055] The method for preparing the low-cost structural bead chain fiber may also include any other suitable components. Preferably, the method for preparing the low-cost structural bead chain fiber also includes:

[0056] (6) Surface modification: The surface of the mini-rib is subjected to surface modification. In order to improve the chemical bonding between the structural bead chain fiber and other materials, surface modification may be performed, such as coating modification technology, to improve its mechanical properties and environmental anti-aging properties.

[0057] The present invention also provides a structural bead chain fiber, which is prepared by using the above-mentioned low-cost structural bead chain fiber preparation method.

[0058] After the fiber raw filaments are bundled, the resin is used for impregnation, and the fiber bundles are continuously hammered and dispersed along the length direction perpendicular to the fiber bundles or squeezed and dispersed from top to bottom in the length direction perpendicular to the fiber bundles to form a periodic spindle structure, and then secondary impregnation is performed. After standing for a period of time, the impregnant is spontaneously oriented to migrate through the surface energy gradient to form a bead chain, which is cured and dried, and sheared into sections to complete the preparation. The bead chain fiber produced by this method can solve the problem of poor interface performance between the fiber and cement, and give full play to the advantage of high tensile strength of the main chain.

[0059] Periodic spindle node structure: refer to the phenomenon of "wetting reconstruction" of spider webs (see Figure 3 ). The fibers of the "wet reconstruction" are characterized by periodic spindle knots, which are composed of random nanofibers separated by neatly arranged nanofiber nodes. This structure produces a surface energy gradient between the spindle knots and the nodes, and a difference in the pressure acting on the water droplets that come into contact with the spindle knots or nodes. This ensures that water can continuously condense around the nodes and then be transported to the spindle knots, where water molecules can accumulate into large hanging water droplets. Through this "wet reconstruction", the spider web allows the moisture in the air to quickly condense into droplets, keeping the whole web dry, and accelerating the directional migration of moisture to form an orderly arrangement on the spider web chain.

[0060] Microfluidics technology: the science and technology involved in systems that use microchannels (tens to hundreds of microns in size) to process or manipulate tiny fluids (nanoliter to attoliter in volume). The "micro" in microfluidics refers to the miniaturization of experimental instruments and equipment (tens to hundreds of microns in size); "flow" means that the experimental object is a fluid (nanoliter to attoliter in volume); and "control" represents the control, operation and processing of fluids on miniaturized equipment. It is a basic technology and is a multidisciplinary cross-disciplinary technology involving biology, chemistry, medicine, chips, materials, and machinery.

[0061] The present invention uses spider silk bionics to complete the microfluidic surface design of fiber bundle impregnation liquid and realize the directional and efficient driving of small-scale droplets. That is, periodic fiber dispersion points are introduced on the fiber bundle to generate spindle nodes to drive the impregnation liquid into beads.

[0062] Before the secondary impregnation, the fiber tow is transformed into a fluffy mass composed of nanometer / micrometer-scale fine fibers and its connection structure by rapid hammering or squeezing. In the secondary impregnation, the structure is transformed into a periodic protrusion structure (Spindle-knot) and a slender connection structure (Joint). A disorderly distributed nanometer / micrometer-scale fiber structure is formed on the spindle-knot, while an orderly arranged nanometer / micrometer-scale fiber structure is formed on the joint. These structural characteristics form a surface energy gradient between the spindle-knot and the joint, and a Laplace pressure difference is also generated due to the curvature gradient. The coupling of these microscopic multi-structures allows the forces of the two gradients to act synergistically on small-scale droplets, allowing the fiber tow to complete the transmission from the joint to the spindle-knot. The result is that larger impregnation droplets can be quickly and efficiently concentrated and stably hung on the fiber tow, thereby producing ultra-high-quality uniform bead chains.

[0063] Compared with the prior art, the present invention has the following advantages:

[0064] 1. Good bead quality: tiny droplets are round and evenly spaced.

[0065] 2. High molding efficiency: With the spindle node as the positioning point of the resin liquid bead, a simple hammering / rolling (extrusion) can form the spindle node for impregnation.

[0066] 3. Low energy consumption and wear: The periodic spindle structure is used to drive the material to form spontaneously, reducing the movement wear of the mechanical structure.

[0067] 4. Good application effect: Structural bead chain fiber can provide stronger grip for composite reinforcing fiber and improve the mechanical properties of cement products.

[0068] Therefore, the present invention proposes a method for preparing a low-cost structural bead chain fiber, and the prepared structural bead chain fiber can be used to reinforce cement products. The preparation method is to make fiber filaments into bead chains, that is, to bundle the fiber filaments to obtain fiber bundles, and on the fiber bundles, the resin is formed into ball droplets by the above-mentioned low-cost method specifically claimed in the present invention, and the resin is solidified to form a fiber-resin bead chain, and then the bead chain is cut into mini sticks. The bead chain can increase the coordination ability of the fiber body and the cement matrix deformation, improve the stress distribution at both ends of the fiber, and enhance the mechanical properties.

[0069] In summary, the structural bead chain fibers prepared by the method for preparing low-cost structural bead chain fibers of the present invention have round particles, high molding efficiency, and low bead chain manufacturing cost, and are suitable for large-scale promotion and application.

[0070] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the description should be regarded as illustrative rather than restrictive.

Claims

1. A method for preparing low-cost structural bead chain fiber, characterized in that: The following steps are involved: (1) Bundling: Bundling fiber raw filaments to obtain fiber bundles; (2) Dipping: dipping the fiber bundle into resin and leaving it to stand; (3) bead making: taking out the fiber bundle, determining a plurality of processing positions on the fiber bundle, wherein the plurality of processing positions are arranged at equal distances from each other along the length direction of the fiber bundle, and hammering the processing positions along the length direction perpendicular to the fiber bundle or squeezing and dispersing the processing positions from top to bottom in the length direction perpendicular to the fiber bundle; (4) Curing: the fiber bundle is immersed in another resin and allowed to stand to form a bead, the fiber bundle is taken out to be cured, and dried to form a shape; (5) Cutting into segments: Cutting the fiber bundle into segments to form mini-ribs, wherein the mini-ribs are structural bead chain fibers.

2. The method for preparing low-cost structural bead chain fiber according to claim 1, characterized in that: In the step (1), the specific steps of bundling are: bundling the fiber filaments by twisting and bonding, or by twisting them without twisting or by weakly twisting them.

3. The method for preparing low-cost structural bead chain fiber according to claim 1, characterized in that: In the step (2), the standing time is 5 seconds to 60 seconds.

4. The method for preparing low-cost structural bead chain fiber according to claim 1, characterized in that: In the step (3), the distance between two adjacent processing positions is 5 mm to 10 mm.

5. The method for preparing low-cost structural bead chain fiber according to claim 1, characterized in that: In the step (3), the hammering is performed by using intermittent micro-water torrents or an electromagnetic relay hammer, and the extrusion is performed by using a rib plate.

6. The method for preparing low-cost structural bead chain fiber according to claim 1, characterized in that: In the step (4), the standing time is 5 to 10 seconds.

7. The method for preparing low-cost structural bead chain fiber according to claim 1, characterized in that: In the step (4), the curing time is 5 minutes to 30 minutes, the drying temperature is 40° C. to 60° C., and the drying time is 12 hours to 48 hours.

8. The method for preparing low-cost structural bead chain fiber according to claim 1, characterized in that: In step (5), the length of the mini ribs is 30 mm to 50 mm.

9. The method for preparing low-cost structural bead chain fiber according to claim 1, characterized in that: The method for preparing the low-cost structural bead chain fiber also includes: (6) Surface modification: The surface of the mini-ribs is subjected to surface modification treatment.

10. A structural bead chain fiber, characterized in that: The low-cost structural bead chain fiber is prepared by the preparation method of any one of claims 1 to 9.

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