Continuous fiber reinforced thermoplastic prepreg tape and preparation method thereof

Abstract

The invention discloses a continuous fiber reinforced thermoplastic prepreg tape. The continuous fiber reinforced thermoplastic prepreg tape is prepared from the following raw materials in percentage by weight: 36.2-48.7% of thermoplastic resin; 50-60% of continuous fiber; 1.2-2% of a toughening agent; 2-4% of maleic anhydride grafted polyolefin; 0-0.4% of carrier-free color master batch; 0-1.2% of an antioxidant; and 0-1.2% of a UV absorbent. According to the continuous fiber reinforced thermoplastic prepreg tape provided by the invention, the tensile strength, rigidity, thermal deformation temperature and other properties of a product are improved by adding maleic anhydride grafted polyolefin with higher heat-resistant temperature for blending, so that the continuous fiber reinforced thermoplastic prepreg tape can not be softened or deformed in a higher-temperature environment, and the use effect is enhanced.

Description

Technical Field

[0001] This application relates to the technical field of polymer materials, and particularly to a continuous fiber reinforced thermoplastic prepreg tape and a preparation method thereof. Background Art

[0002] The continuous fiber reinforced thermoplastic prepreg tape is prepared by impregnating continuous fibers with thermoplastic resin. Currently, the common continuous fiber reinforced thermoplastic prepreg tape is affected by the physical properties of the matrix resin, and has a poor heat resistance temperature. The material softens after ten-odd minutes in a higher temperature environment, which severely limits the use of the prepreg tape.

[0003] Therefore, a continuous fiber reinforced thermoplastic prepreg tape and a preparation method thereof are needed to at least partially solve the above problems. Summary of the Invention

[0004] In the summary of the invention part of this application, a series of simplified concepts are introduced, which will be further detailed in the specific implementation part. The summary of the invention part of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0005] To at least partially solve the above problems, a first aspect of this application provides a continuous fiber reinforced thermoplastic prepreg tape, which is prepared from raw materials in the following weight percentages:

[0006]

[0007] According to the continuous fiber reinforced thermoplastic prepreg tape of this application, by adding maleic anhydride grafted polyolefin with a higher heat resistance temperature for blending, the tensile strength, rigidity, heat distortion temperature and other properties of the product are improved, so that the continuous fiber reinforced thermoplastic prepreg tape can not soften and deform in a higher temperature environment, enhancing the use effect.

[0008] Optionally, the thermoplastic resin is polyethylene terephthalate.

[0009] Optionally, the continuous fiber is glass fiber.

[0010] Optionally, the sizing agent system on the surface of the glass fiber contains amino silane.

[0011] Optionally, the toughening agent is glycidyl methacrylate grafted ethylene-based elastomer.

[0012] Optionally, the antioxidant is a hindered phenol phosphite.

[0013] Optionally, the UV absorber is methylene bis-benzotriazolyl tetramethylbutylphenol.

[0014] The second aspect of the present application provides a method for preparing a continuous fiber reinforced thermoplastic prepreg tape according to any one of the above technical solutions, including the following steps:

[0015] S10: Mix the following raw materials by weight percentage:

[0016]

[0017] S20: Draw out 50 - 60% of continuous fibers by weight percentage from the creel.

[0018] S30: Melt the mixture in step S10 and compound it with the continuous fibers to obtain the continuous fiber reinforced thermoplastic prepreg tape.

[0019] Optionally, the mixing time in step S10 is 20 - 30 min.

[0020] Optionally, the melting temperature of the material in step S30 is 170 - 255 °C.

[0021] According to the method for preparing a continuous fiber reinforced thermoplastic prepreg tape of the present application, by adding maleic anhydride grafted polyolefin blend with a higher heat resistance temperature, the properties such as tensile strength, rigidity, and heat distortion temperature of the product are improved, so that the continuous fiber reinforced thermoplastic prepreg tape can not soften and deform in an environment with a higher temperature, enhancing the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following drawings of the present application are part of the present application for understanding the present application. The embodiments and descriptions of the present application shown in the drawings are used to explain the principles of the present application.

[0023] In the drawings:

[0024] Figure 1 is a flowchart for preparing a continuous fiber reinforced thermoplastic prepreg tape according to a preferred embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features known to the public are not described.

[0026] For a thorough understanding of the present application, a detailed description will be presented in the following. Apparently, the implementation of the embodiments of the present application is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may also have other embodiments.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or combinations thereof.

[0028] The ordinal numbers such as "first" and "second" cited in the present application are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component".

[0029] It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and similar expressions used herein are only for illustrative purposes and are not restrictive.

[0030] Now, the exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concepts of these exemplary embodiments are fully conveyed to those of ordinary skill in the art.

[0031] A first aspect of the present application discloses a continuous fiber reinforced thermoplastic prepreg tape. The continuous fiber reinforced thermoplastic prepreg tape is prepared from the following raw materials by weight percentage:

[0032] Thermoplastic resin 36.2 - 48.7%;

[0033] Continuous fiber 50 - 60%;

[0034]

[0035] The thermoplastic resin is preferably polyethylene terephthalate (PET), the melting point of the PET resin is 180 °C; the intrinsic viscosity is 0.5 - 0.7 dL / g; the density is 1.13 - 1.3 g / cm 3 ; the melt index is 70 g / 10 min (at 235 °C). The continuous fiber is preferably glass fiber, the diameter of the glass fiber is 15 - 20 μm, the linear density is 1100 - 1300 tex, and the surface sizing agent system contains amino silane to improve the compatibility between the glass fiber and the resin. The toughening agent is preferably glycidyl methacrylate (GMA) grafted vinyl elastomer. The addition of the rubber phase can improve the toughness of the product and prevent cracking during the subsequent processing of the product. The antioxidant is preferably a hindered phenol phosphite. The UV absorber is preferably methylene bis-benzotriazolyl tetramethylbutylphenol to improve the aging resistance of the material.

[0036] For the continuous fiber reinforced thermoplastic prepreg tape according to the present application, by adding maleic anhydride grafted polyolefin with a higher heat resistance temperature for blending, the tensile strength, rigidity, heat distortion temperature and other properties of the product are improved, so that the continuous fiber reinforced thermoplastic prepreg tape can not soften and deform in an environment with a higher temperature, enhancing the use effect.

[0037] As Figure 1 shown, the second aspect of the present application discloses a preparation method of a continuous fiber reinforced thermoplastic prepreg tape, including the following steps:

[0038] S10: Mix the following raw materials by weight percentage:

[0039]

[0040] The mixing time is 20 - 30 min.

[0041] S20: Draw out 50 - 60% of the continuous fiber by weight percentage from the creel.

[0042] S30: After melting the materials mixed in step S10, compound them with the continuous fiber to obtain the continuous fiber reinforced thermoplastic prepreg tape. Among them, the melting temperature of the materials is 170 - 255 °C.

[0043] Specifically, in a preferred embodiment, the preparation method of the continuous fiber reinforced thermoplastic prepreg tape is to pour the thermoplastic resin, toughening agent, maleic anhydride grafted polyolefin, antioxidant, and UV absorber into a mixer according to the above mass ratio and mix them evenly; the mixing time is 20 - 30 min.

[0044] Put the mixed materials into the hopper of the extruder. The temperatures of each section of the extruder are as follows: Zone 1: 150 - 170°C; Zone 2: 170 - 190°C; Zone 3: 200 - 220°C; Zone 4: 220 - 240°C; Zone 5: 240 - 245°C; Zone 6: 245 - 255°C; The connection area between the barrel and the mold: 245 - 255°C; The hanger die area: 245 - 255°C; The impregnation mold area: 245 - 255°C.

[0045] Place the continuous fiber yarn roll on the yarn rack. The continuous fiber passes through the heddle, yarn spreading roller and enters the impregnation mold cavity, and exits from the die head on the other side of the mold cavity.

[0046] Start the extruder (rotation speed 30 - 40 r / min), and at the same time, slowly draw the continuous fiber. The resin is sheared, conveyed by the screw, passes through the melt pump and the runner, and finally enters the mold cavity to complete the impregnation of the continuous fiber and the resin, obtaining a sheet. The sheet is formed by a shaping roller and a cooling roller (the temperature of the cooling roller is 30 - 50°C) to obtain the final prepreg tape product.

[0047] The above process is only an example. Unless adverse effects occur, various processing operations can be carried out in an order different from that of the above process. The order of the steps of the above process can also be adjusted, combined or deleted according to actual needs.

[0048] According to the preparation method of the continuous fiber reinforced thermoplastic prepreg tape of the present application, by adding maleic anhydride grafted polyolefin with a higher heat resistance temperature for blending, the properties such as the tensile strength, rigidity and heat distortion temperature of the product are improved, so that the continuous fiber reinforced thermoplastic prepreg tape can not soften and deform in an environment with a higher temperature, enhancing the use effect.

[0049] Example

[0050] Put 25 kg of PET resin, 2 kg of glycidyl methacrylate grafted ethylene elastomer, 2.5 kg of maleic anhydride grafted polyolefin, 75 g of hindered phenolic phosphite, and 75 g of methylene bis - benzotriazolyl tetramethyl butyl phenol into a mixer and mix evenly, with the mixing time being 25 min. Put the mixed materials into the hopper of the extruder. The temperatures of each section of the extruder are as follows: Zone 1: 160°C; Zone 2: 180°C; Zone 3: 210°C; Zone 4: 230°C; Zone 5: 240°C; Zone 6: 248°C; The connection area between the barrel and the mold: 248°C; The hanger die area: 248°C; The impregnation mold area: 248°C. Place the glass fiber yarn roll on the yarn rack. The glass fiber passes through the heddle, yarn spreading roller and enters the impregnation mold cavity, and exits from the die head on the other side of the mold cavity. Start the extruder (rotation speed 35 r / min), and at the same time, slowly draw the glass fiber. The resin is sheared, conveyed by the screw, passes through the melt pump and the runner, and finally enters the mold cavity to complete the impregnation of the glass fiber and the resin, obtaining a sheet. The sheet is formed by a shaping roller and a cooling roller (the temperature of the cooling roller is 40°C) to obtain the final prepreg tape product. Among them, the mass of the glass fiber is 60% of the total mass of the product.

[0051] Comparative example

[0052] Put 25 kg of PET resin, 2 kg of glycidyl methacrylate-grafted ethylene elastomer, 75 g of hindered phenol phosphite, and 75 g of methylene bis-benzotriazolyl tetramethylbutylphenol into a mixer and mix evenly for 25 minutes. Put the mixed material into the hopper of the extruder. The temperatures of each section of the extruder are: Zone 1: 160 °C; Zone 2: 180 °C; Zone 3: 210 °C; Zone 4: 230 °C; Zone 5: 240 °C; Zone 6: 248 °C; the connection area between the barrel and the mold: 248 °C; the hanger die area: 248 °C; the impregnation mold area: 248 °C. Place the glass fiber yarn roll on the yarn stand, and the glass fiber passes through the reed and the yarn spreading roller and enters the impregnation mold cavity and exits from the die head on the other side of the mold cavity. Start the extruder (rotation speed 35 r / min), and at the same time, slowly draw the glass fiber. The resin is sheared, conveyed by the screw, passed through the melt pump and the runner, and finally enters the mold cavity to complete the impregnation of the glass fiber and the resin, obtaining a sheet. The sheet is formed by a shaping roller and a cooling roller (the temperature of the cooling roller is 40 °C) to obtain the final prepreg product. Among them, the mass of the glass fiber is 60% of the total mass of the product.

[0053] In this application, the heat resistance of the prepreg is detected by measuring the Vicat softening temperature. The test standard is GB / T 1633-2000, and the test method is B50. Specimen preparation: Obtain a 4-mm-thick plate from the prepreg product by laminating and molding, and use a carving machine to carve the final test specimen. The specimen size is: 10 mm × 10 mm × 4 mm.

[0054] The specific formulation ratio design and test data are shown in Table 1.

[0055] Table 1

[0056]

[0057] According to the data in Table 1, it can be seen that blending with maleic anhydride-grafted polyolefin with a higher heat resistance temperature can effectively increase the heat resistance temperature of the thermoplastic resin.

[0058] In summary, through the blending scheme of adding maleic anhydride-grafted polyolefin with a higher heat resistance temperature, the heat resistance of the continuous fiber-reinforced thermoplastic prepreg has been significantly optimized and improved, which can enable the material to adapt to more severe use conditions and broaden the application scenarios of the material.

[0059] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the technical field of this application. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The features described in one embodiment herein can be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise stated in that other embodiment.

[0060] This application has been illustrated by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and this application is not limited to the above embodiments. According to the teachings of this application, more variations and modifications can be made, and these variations and modifications all fall within the scope claimed by this application.

Claims

1. A continuous fiber reinforced thermoplastic prepreg tape, characterized in that, Prepared from the following raw materials by weight percentage:

2. The continuous fiber reinforced thermoplastic prepreg tape according to claim 1, wherein The thermoplastic resin is polyethylene terephthalate.

3. The continuous fiber reinforced thermoplastic prepreg tape according to claim 1, characterized in that, The continuous fiber is glass fiber.

4. The continuous fiber reinforced thermoplastic prepreg tape according to claim 3, characterized in that, The surface sizing agent system of the glass fiber contains aminosilane.

5. The continuous fiber reinforced thermoplastic prepreg tape according to claim 1, characterized in that, The toughening agent is glycidyl methacrylate grafted ethylene elastomer.

6. The continuous fiber reinforced thermoplastic prepreg tape according to claim 1, characterized in that, The antioxidant is hindered phenol phosphite.

7. The continuous fiber reinforced thermoplastic prepreg tape according to claim 1, wherein The UV absorber is methylene bis-benzotriazolyl tetramethylbutylphenol.

8. A method for preparing a continuous fiber-reinforced thermoplastic prepreg tape according to any one of the above claims 1-7, characterized in that, Including the following steps: S10: Mix the following raw materials by weight percentage: S20: Draw out 50-60% of the continuous fiber by weight percentage from the creel. S30: Melt the mixture in step S10 and compound it with the continuous fiber to obtain the continuous fiber reinforced thermoplastic prepreg tape.

9. The preparation method according to claim 8, wherein The mixing time in step S10 is 20-30 min.

10. The preparation method according to claim 8, characterized in that, The melting temperature of the material in step S30 is 170-255 °C.

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