Anchoring structure carbon fiber thermoplastic rib material and preparation method thereof

Abstract

The invention discloses an anchoring structure carbon fiber thermoplastic rib material and a preparation method thereof. The thermoplastic rib material is prepared by integrally forming hybrid fibers formed by carbon fibers and thermoplastic resin fibers and an anchoring structure. The hybrid fibers made of the carbon fibers and the thermoplastic resin fibers are subjected to rewinding forming, it is guaranteed that all the carbon fibers are basically in an equal-tension state, and the phenomenon that local carbon fibers are damaged in the using process is completely eradicated; by adopting a semi-finished product which is pre-coated, bundled and wound by the resin film, the defects of lack of glue on the surface of the rib material and the like can be overcome, and the product has good surface appearance; a molten thermoplastic rib prefabricated body is accurately transferred into a mold pressing mold through a mechanical arm and tool equipment, cold pressing forming is conducted through a pressing machine, and the production efficiency and the qualification rate are improved; products meeting the requirements of specifications such as length can be prepared during forming, and procedures such as measurement and cutting do not need to be carried out on site; and by designing an anchoring structure, the anchoring coefficient of the rib material and the concrete is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of composite materials, and in particular relates to an anchoring structure carbon fiber thermoplastic reinforcement material and a preparation method thereof. Background Art

[0002] The main difference between thermoplastic composite reinforcement and thermosetting composite reinforcement is that the thermoplastic matrix can be melt processed again, which brings two major advantages:

[0003] First, the recyclability of thermoplastic composite reinforcements. With the current increase in environmental pressure, the treatment and reuse of retired thermosetting composites has become a major social problem. The melt-reprocessable performance of thermoplastic composite reinforcements allows them to be processed and reused, greatly improving their recycling capacity and reducing environmental pressure;

[0004] Second, the bendability of thermoplastic composite reinforcement. An important problem that restricts the large-scale production and application of FRP (fiber reinforced plastic) thermosetting materials in actual engineering is that they do not have the characteristics of secondary molding. Once the material is heated and cured, its shape cannot be changed again. It has no reprocessing ability at the construction site, making it difficult to form many special forms such as bent reinforcement and stirrups required in the structure. There are several existing methods for making FRP stirrups and bent reinforcement:

[0005] 1) Use new epoxy steel bars;

[0006] 2) Prefabricate thermosetting FRP bending bars in the factory;

[0007] 3) The fiber is embedded in the hose, and the resin is injected and then solidified into shape.

[0008] However, none of the above methods can fundamentally improve the flexibility of FRP bars during construction, resulting in low production efficiency. The remelting processability of thermoplastic composite bars enables the use of heating and melting methods to realize the production of bent bars on the construction site, which can greatly improve production efficiency and construction flexibility.

[0009] However, due to its smooth surface, the traditional thermoplastic reinforcement in concrete relies on the combined effect of factors such as the meshing force, friction force, and bonding force between the reinforcement and concrete, and its anchoring coefficient is not high or even unstable. Summary of the invention

[0010] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide an anchoring structure carbon fiber thermoplastic reinforcement and a preparation method thereof.

[0011] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:

[0012] A carbon fiber thermoplastic reinforcement material with an anchoring structure is prepared by integrally molding a hybrid fiber formed by carbon fiber and thermoplastic resin fiber with an anchoring structure.

[0013] The present invention also discloses a method for preparing an anchoring structure carbon fiber thermoplastic reinforcement material, comprising the following steps:

[0014] (1) mixing carbon fiber and thermoplastic resin fiber to form mixed fiber;

[0015] (2) Using winding or rewinding equipment to rewind the hybrid fibers with variable tension until the fiber volume reaches the design requirements, thereby achieving integrated molding of the hybrid fibers and the anchoring structure;

[0016] (3) using a bundling and winding device to round up the mixed fibers that have been wound up in step (2), and performing fiber hoop winding at the same time;

[0017] (4) pre-coating the semi-finished product after bundling and winding, and then melting the pre-coated body by microwave or infrared heating;

[0018] (5) The molten thermoplastic reinforcement preform obtained in step (4) is cold-pressed to obtain a carbon fiber thermoplastic reinforcement.

[0019] Furthermore, in step (1), the weight ratio of the carbon fiber to the thermoplastic resin fiber is 40:60 to 85:15.

[0020] Furthermore, in step (1), the thermoplastic resin fiber is a fiber made of a thermoplastic resin matrix, and the thermoplastic resin matrix is ​​one or a combination of PP, PA, PET, PE, and PPS.

[0021] Furthermore, in step (2), a double gradient design is first performed on one end or two opposite ends of the anchoring structure, and then the hybrid fiber and the anchoring structure are integrally formed.

[0022] Furthermore, in step (3), the circumferential winding angle is 45-135°.

[0023] Furthermore, in step (4), the step of pre-wrapping the semi-finished product after bundling and winding is as follows:

[0024] The semi-finished product after bundling and winding is pre-coated with a resin film with the same matrix as the thermoplastic resin fiber. During the pre-coating, infrared preheating is used at a temperature of 80-160°C, and the constant tension is at a speed of 1-3m / s and the winding and coating is carried out at an angle of 10-20°.

[0025] Furthermore, in step (4), when the pre-coated body is melted by microwave or infrared heating, the heating temperature is 15-40° C. higher than the melting temperature of the thermoplastic resin.

[0026] Furthermore, in step (5), the molding pressure is 0.1-1 MPa, the temperature is 30-120° C., and the molding time is maintained for more than 1 min.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1) The present invention discloses a carbon fiber thermoplastic reinforcement material for an anchoring structure and a preparation method thereof, wherein a product that meets the length and other specification requirements is prepared during molding, without the need for on-site measurement, cutting and other processes; and the anchoring coefficient between the thermoplastic reinforcement material and concrete can be improved by a double-gradient design of the end of the anchoring structure;

[0029] 2) The anchoring structure carbon fiber thermoplastic reinforcement disclosed in the present invention mainly bears tensile load during use. By adopting mixed fibers for winding and forming, each carbon fiber is basically in an isotensoid state, and the local carbon fiber is prevented from being damaged during use;

[0030] 3) The semi-finished product is pre-wrapped with a resin film of the same resin matrix, which can not only solve the defects such as lack of glue on the surface of the reinforcement, but also make the product have a good surface appearance;

[0031] 4) Using a manipulator and tooling equipment to accurately transfer the molten thermoplastic reinforcement preform into the molding die, and cold-pressing the preform through a press, the production efficiency and qualified rate of carbon fiber thermoplastic reinforcement can be improved;

[0032] 5) Compared with using prepreg or prepreg yarn semi-finished products as raw materials, the carbon fiber thermoplastic reinforcement prepared by blending carbon fiber and thermoplastic resin fiber can accurately control and adjust the weight ratio of carbon fiber to thermoplastic resin fiber, and the one-step molding can further reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flow chart of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the anchoring structure of Example 1 of the present invention;

[0035] Figure 3 This is a schematic structural diagram of the anchoring structure of Example 2 of the present invention;. DETAILED DESCRIPTION

[0036] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0037] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0038] The invention discloses an anchoring structure carbon fiber thermoplastic reinforcement material, which is prepared by integrally molding a hybrid fiber formed by carbon fiber and thermoplastic resin fiber with an anchoring structure, and has an anchoring coefficient of more than 0.95.

[0039] like Figure 1-3 As shown, the present invention also discloses a method for preparing an anchoring structure carbon fiber thermoplastic reinforcement material, comprising the following steps:

[0040] (1) mixing carbon fiber and thermoplastic resin fiber in a weight ratio of 40:60 to 85:15 to form mixed fiber, wherein the thermoplastic resin fiber is a thermoplastic fiber made of a thermoplastic resin matrix, and the thermoplastic resin matrix is ​​one or a combination of PP, PA, PET, PE, and PPS;

[0041] (2) Use winding or rewinding equipment to rewind the mixed fiber with variable tension until the fiber volume reaches the product design requirements. Prior to this, it is necessary to design a double gradient for one end or two opposite ends of the anchoring structure. The length and height of the double gradient can be designed according to the anchoring requirements, and then the mixed fiber and the anchoring structure are integrated to achieve the best anchoring effect;

[0042] (3) The mixed fibers rewound in step (2) are rounded by using a bundling winding device, and the fibers are wound hoop-wound at a certain angle while rounding. The winding angle is 45-135°. This part serves as a hoop-reinforcement structure and also realizes a threaded structure on the surface of the reinforcement material.

[0043] (4) Pre-coating the semi-finished product after bundling and winding with a resin film of the same resin matrix as the thermoplastic resin fiber, the steps are: infrared preheating, the temperature is generally controlled at 80-160°C, and the winding and coating is performed at a constant tension of 1-3m / s and a certain angle (10-20°); in this step, if pre-coating is not performed, the resin deficiency phenomenon will occur, the surface defects are relatively obvious, and the appearance and mechanical properties of the product will be affected;

[0044] Then, the pre-coated body is melted by microwave or infrared heating, and the heating temperature should be 15-40°C higher than the melting temperature of the thermoplastic resin;

[0045] (5) Using a manipulator and tooling equipment, the molten thermoplastic reinforcement preform obtained in step (4) is transferred into a compression mold, and the preform is cold-pressed into shape by a press, the molding pressure is generally 0.1-1 MPa, the mold temperature is generally 30-120° C., and the compression time is maintained for more than 1 minute, thereby obtaining a carbon fiber thermoplastic reinforcement. The compression molding method can not only solve defects such as lack of glue on the reinforcement surface, but also make the product have a good surface appearance.

[0046] Example 1

[0047] A carbon fiber thermoplastic reinforcement material with an anchoring structure is prepared by integrally molding a hybrid fiber formed by carbon fiber and thermoplastic resin fiber with an anchoring structure, and has an anchoring coefficient of 0.95.

[0048] like Figure 1-2 As shown, a method for preparing an anchoring structure carbon fiber thermoplastic reinforcement comprises the following steps:

[0049] (1) mixing carbon fiber and thermoplastic resin fiber in a weight ratio of 40:60 to form mixed fiber, wherein the thermoplastic resin fiber is a thermoplastic fiber made of a thermoplastic resin matrix, and the thermoplastic resin matrix is ​​PP;

[0050] (2) Use the rewinding equipment to rewind the mixed fiber with variable tension until the fiber volume reaches the product design requirements. Prior to this, a double-gradient design is required for one end of the anchoring structure. The length and height of the double gradient can be designed according to the anchoring requirements, and then the mixed fiber and the anchoring structure are integrated to achieve the best anchoring effect;

[0051] (3) The mixed fibers rewound in step (2) are rounded by using a bundling winding device, and the fibers are wound hoop-wound at a certain angle while rounding. The winding angle is 45°. This part serves as a hoop-wound reinforcement structure and also realizes a threaded structure on the surface of the reinforcement material.

[0052] (4) Pre-coating the semi-finished product after bundling and winding with a resin film of the same resin matrix as the thermoplastic resin fiber, the steps are: infrared preheating, the temperature is generally controlled at 80°C, and the winding and coating are performed at a constant tension of 1 m / s and a certain angle (10°); in this step, if pre-coating is not performed, the resin deficiency phenomenon will occur, the surface defects will be more obvious, and the appearance and mechanical properties of the product will be affected;

[0053] Then, the pre-coated body is melted by infrared heating, and the heating temperature should be 15°C higher than the melting temperature of the thermoplastic resin;

[0054] (5) Using a manipulator and tooling equipment, the molten thermoplastic reinforcement preform obtained in step (4) is transferred into a molding die, and the preform is cold-pressed into shape by a press, the molding pressure is generally 0.1 MPa, the mold temperature is generally 30° C., and the molding time is maintained for 2 minutes, thereby obtaining a carbon fiber thermoplastic reinforcement. The above-mentioned molding method can not only solve the defects such as lack of glue on the reinforcement surface, but also make the product have a good surface appearance.

[0055] Example 2

[0056] A carbon fiber thermoplastic reinforcement material with an anchoring structure is prepared by integrally molding a hybrid fiber formed by carbon fiber and thermoplastic resin fiber with an anchoring structure.

[0057] like Figure 1 , 3 As shown, a method for preparing an anchoring structure carbon fiber thermoplastic reinforcement comprises the following steps:

[0058] (1) mixing carbon fiber and thermoplastic resin fiber in a weight ratio of 85:15 to form mixed fiber, wherein the thermoplastic resin fiber is a thermoplastic fiber made of a thermoplastic resin matrix, and the thermoplastic resin matrix is ​​PA;

[0059] (2) Use winding or rewinding equipment to rewind the mixed fiber with variable tension until the fiber volume reaches the product design requirements. Prior to this, it is necessary to design a double gradient for the two opposite ends of the anchoring structure. The length and height of the double gradient can be designed according to the anchoring requirements, and then the mixed fiber and the anchoring structure are integrated to achieve the best anchoring effect;

[0060] (3) The mixed fibers rewound in step (2) are rounded by using a bundling winding device, and the fibers are wound hoop-wound at a certain angle while rounding. The winding angle is 135°. This part serves as a hoop-wound reinforcement structure and also realizes a threaded structure on the surface of the reinforcement material.

[0061] (4) Pre-coating the semi-finished product after bundling and winding with a resin film having the same resin matrix as the thermoplastic resin fiber, the steps are: preheating with infrared, the temperature is generally controlled at 120°C, winding and coating at a constant tension of 3m / s, and at a certain angle (20°); in this step, if pre-coating is not performed, the resin deficiency phenomenon will occur, the surface defects will be more obvious, and the appearance and mechanical properties of the product will be affected;

[0062] The pre-coated body is then melted by infrared heating, and the heating temperature should be 40°C higher than the melting temperature of the thermoplastic resin;

[0063] (5) Using a manipulator and tooling equipment, the molten thermoplastic reinforcement preform obtained in step (4) is transferred into a molding die, and the preform is cold-pressed into shape by a press, the molding pressure is generally 1 MPa, the mold temperature is generally 80°C, and the molding time is maintained for 5 minutes, thereby obtaining a carbon fiber thermoplastic reinforcement. The above-mentioned molding method can not only solve the defects such as lack of glue on the reinforcement surface, but also make the product have a good surface appearance.

[0064] The rest is the same as in Example 1.

[0065] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0066] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A carbon fiber thermoplastic reinforcement material with an anchoring structure, characterized in that: The hybrid fiber formed by carbon fiber and thermoplastic resin fiber is prepared by integrally molding the hybrid fiber and the anchoring structure.

2. A method for preparing an anchoring structure carbon fiber thermoplastic reinforcement, characterized in that: The following steps are involved: (1) mixing carbon fiber and thermoplastic resin fiber to form mixed fiber; (2) Using winding or rewinding equipment to rewind the hybrid fibers with variable tension until the fiber volume reaches the design requirements, thereby achieving integrated molding of the hybrid fibers and the anchoring structure; (3) using a bundling and winding device to round up the mixed fibers that have been wound up in step (2), and performing fiber hoop winding at the same time; (4) pre-coating the semi-finished product after bundling and winding, and then melting the pre-coated body by microwave or infrared heating; (5) The molten thermoplastic reinforcement preform obtained in step (4) is cold-pressed to obtain a carbon fiber thermoplastic reinforcement.

3. The method for preparing a carbon fiber thermoplastic reinforcement material for an anchoring structure according to claim 2, characterized in that: In step (1), the weight ratio of the carbon fiber to the thermoplastic resin fiber is 40:60 to 85:

15.

4. The method for preparing a carbon fiber thermoplastic reinforcement material for an anchoring structure according to claim 2, characterized in that: In step (1), the thermoplastic resin fiber is a fiber made of a thermoplastic resin matrix, and the thermoplastic resin matrix is ​​one or a combination of PP, PA, PET, PE, and PPS.

5. The method for preparing a carbon fiber thermoplastic reinforcement material for an anchoring structure according to claim 2, characterized in that: In step (2), a double gradient design is first performed on one end or two opposite ends of the anchoring structure, and then the hybrid fiber and the anchoring structure are integrally formed.

6. The method for preparing a carbon fiber thermoplastic reinforcement material for an anchoring structure according to claim 2, characterized in that: In step (3), the circumferential winding angle is 45-135°.

7. The method for preparing a carbon fiber thermoplastic reinforcement material for an anchoring structure according to claim 2, characterized in that: In step (4), the step of pre-wrapping the semi-finished product after bundling and winding is as follows: The semi-finished product after bundling and winding is pre-coated with a resin film with the same matrix as the thermoplastic resin fiber. During the pre-coating, infrared preheating is used at a temperature of 80-160°C, and the constant tension is at a speed of 1-3m / s and the winding and coating is carried out at an angle of 10-20°.

8. The method for preparing a carbon fiber thermoplastic reinforcement material for an anchoring structure according to claim 2, characterized in that: In step (4), when the pre-coated body is melted by microwave or infrared heating, the heating temperature is 15-40° C. higher than the melting temperature of the thermoplastic resin.

9. The method for preparing a carbon fiber thermoplastic reinforcement material for an anchoring structure according to claim 2, characterized in that: In step (5), the molding pressure is 0.1-1 MPa, the temperature is 30-120° C., and the molding time is maintained for more than 1 minute.

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