Thermoplastic fiber reinforced composite sliding plate and preparation method thereof

Abstract

The invention discloses a thermoplastic fiber reinforced composite material sliding plate and a preparation method thereof.The sliding plate is made of a thermoplastic fiber reinforced composite material, and the preparation method comprises the following steps that firstly, weighed thermoplastic resin and a molding processing aid are mixed and added into a double-stage double-screw extruder for first-stage mixing extrusion, and a mixture is obtained; then adding the first-order extrusion hot-melt resin film and the fiber reinforced material into a second-stage inlet of the double-order double-screw extruder, and carrying out second-order mixing extrusion to obtain an extruded hot-melt blank; 2, heating the reinforced continuous fiber prepreg in a continuous heating furnace to obtain a hot-melt reinforced material; thirdly, the hot melting blank and the hot melting reinforcing material are added into a mold, and mold pressing is conducted. By adopting the preparation method, the performance of the thermoplastic composite material can be adjusted and locally enhanced as required, and meanwhile, the thermoplastic composite material is continuously produced by an online one-step method, so that the automation degree is high, the product performance is stable, the energy consumption is lower, and continuous, large-scale, low-cost and high-quality sliding plate production can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of extreme sports skateboard materials and skateboard preparation, and in particular to a thermoplastic fiber reinforced composite skateboard and a preparation method thereof. Background Art

[0002] Extreme skateboarding originated in California, USA in the 1950s. It originally appeared as an extension of surfing. Over time, extreme skateboarding has undergone a transformation from street culture to an Olympic event. Extreme sports skateboard materials and their production and preparation technology and culture are also constantly developing and evolving.

[0003] Currently, most extreme sports skateboards are made of maple plywood. Due to the rarity and high quality requirements of maple, the price of maple skateboards is usually high, which is not very friendly to the popularization of this sport and to primary and secondary school students with limited financial resources; maple plywood skateboards have a certain degree of water absorption and are easily affected by humidity changes. Improper storage conditions may cause the skateboard to deform or loosen, affecting its use; not only that, the preparation of maple skateboards has high quality requirements and large demand for tree raw materials, especially the cumbersome and complicated processing procedures. The logs must first be peeled, sawn, dried, and sliced, and then the dried sheets must be further processed, such as planing, sanding, gluing, pressing, etc. Finally, according to the design requirements, , the laminate is cut into the shape and size of the skateboard, and then post-processed with polishing, painting, assembly, quality inspection, etc. In short, it takes a lot of complicated processes to complete, which makes the production cycle long, energy consumption high, and costly; due to the wood itself, the color of skateboard products is single, and spraying for beauty not only increases the cost but also pollutes the environment; the non-slip surface of the skateboard is also a disadvantage. In order to make the skateboard safe and maintain the best performance of the skateboard, the skateboard sandpaper needs to be replaced regularly, which increases the cost of use; in addition, most of the maple wood used to make skateboards comes from Canada and Russia. For this reason, my country spends a lot of foreign exchange every year to import maple logs from abroad. Therefore, those skilled in the art need to make revolutionary innovations in both materials and preparation. Summary of the invention

[0004] The purpose of the present invention is to provide a thermoplastic fiber reinforced composite skateboard with simple structure, easy production, light weight, high elasticity, moderate hardness, good foot feel and durability (see Figure 1 ) and its large-scale, low-cost, energy-saving, environmentally friendly and sustainable production and preparation method.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] The first aspect is to provide a method for preparing a thermoplastic fiber reinforced composite skateboard, wherein the skateboard adopts a thermoplastic fiber reinforced composite material, and the preparation method comprises the following steps:

[0007] Step 1: According to weight percentage, 40-80% of thermoplastic resin and 0.05-5% of molding processing aid are mixed, and added into a two-stage twin-screw extruder for first-stage extrusion, and then the molten resin film extruded by the first-stage machine and 18-60% of cut fiber reinforcement material are added into the second-stage inlet of the two-stage twin-screw extruder for second-stage extrusion to obtain an extruded hot melt blank;

[0008] Step 2, heating the reinforced continuous fiber prepreg in a continuous heating furnace to obtain a hot-melt reinforcement material;

[0009] Step three: Determine the weight, size and layer position of the hot-melt reinforcement material and the extruded hot-melt blank according to the structural design of the skateboard and the size of the mold, add them to the plate area and reinforcement area in the mold respectively, and then quickly close the mold, pressurize, fill the mold, and shape it, and finally obtain a thermoplastic fiber reinforced composite skateboard.

[0010] Furthermore, the thermoplastic resin is one or more of PP, PA, PC, and PPS.

[0011] Furthermore, the fiber reinforcement material is one or more of glass fiber, carbon fiber, basalt fiber, and natural plant fiber.

[0012] Furthermore, the fibers are one or more of long fibers, continuous fiber fabrics, and unidirectional continuous fiber tapes.

[0013] Furthermore, the molding processing aid is one or more of a masterbatch, a coupling agent, an antioxidant, an impact modifier, a heat stabilizer, and a plasticizer.

[0014] Furthermore, the operating conditions of the first-stage extrusion are: a rotation speed of 400-600 rpm, and an outlet die temperature of 200-290°C; the operating conditions of the second-stage extrusion are: a rotation speed of 200-300 rpm, and an outlet die temperature of 200-300°C.

[0015] Furthermore, the temperature of the continuous heating furnace is set to 200-300°C.

[0016] Furthermore, the temperature of the mold is controlled at 40-100°C.

[0017] Furthermore, the die is made of a high-speed, high-pressure press, the press slider descends at a speed of 300-500 mm / s, and the pressure per square centimeter is 6-10 MPa.

[0018] The second aspect is to provide a thermoplastic fiber reinforced composite skateboard prepared by the above preparation method.

[0019] The present invention adopts the above technical solution, and has the following technical effects compared with the prior art:

[0020] The present invention adopts thermoplastic fiber reinforced composite materials to replace traditional maple multilayer plywood as the skateboard body. The preparation method adopts the advanced process technology of direct online long fiber reinforced thermoplastic composite materials + continuous fiber fabric composite materials (reinforcement materials) for local reinforcement, and high-speed and high-pressure compression molding. Specifically: thermoplastic resin, fiber reinforcement materials and processing aids are mixed by computer-controlled weight analysis, and the speed, temperature and screw configuration of the second-stage twin-screw extruder are changed to melt the resin, mix the fibers and extrude and cut the thermoplastic composite embryo. The hot-melt embryo plus the hot-melt continuous fiber fabric are placed in the mold plate area and the reinforcement area according to the design requirements, and local reinforcement is carried out, and high-speed and high-pressure compression molding is carried out. The advantages of the above process are that the performance of the thermoplastic composite material can be adjusted and locally strengthened according to demand, and it is continuously produced in one step online, with a high degree of automation, stable product performance, and low energy consumption, so that continuous, large-scale, low-cost, and high-quality skateboard production can be realized.

[0021] The skateboard of the present invention adopts a thermoplastic fiber reinforced composite material, which is not only light, high-strength, high-rigidity, low processing cost, excellent thermal performance, chemical corrosion resistance, and excellent anti-fatigue performance, but more importantly, the manufacturing process is non-toxic, harmless, and waste-free, and does not require spraying and coloring. The material is recyclable and very environmentally friendly. It is a new skateboard material that complies with modern environmental protection and sustainable development.

[0022] The skateboard of the present invention makes full use of the designable advantages of thermoplastic fiber reinforced composite materials, and fully designs the materials, structure and processing technology according to the usage characteristics of the skateboard, so as to ensure that the product has high dimensional accuracy, good repeatability, smooth surface, and reduces secondary processing; in addition, the anti-slip surface, inserts, reinforcing ribs, etc. are designed according to the mechanical requirements of the skateboard to obtain superior mechanical properties and one-time molding of complex structures.

[0023] The skateboard of the present invention makes full use of the short production cycle of thermoplastic fiber reinforced composite materials. The skateboard body can be molded at a rate of one piece every 1 to 3 minutes. Based on a longest production cycle of one piece every 3 minutes, 300 working days per year, and 21 hours of effective machine operation per day, each production line can produce 126,000 skateboard bodies per year. If one machine has two molds, the production capacity can be doubled, and 252,000 skateboard bodies can be produced, which can greatly meet the large-scale market demand for the development of skateboarding.

[0024] The thermoplastic fiber reinforced composite skateboard body production line of the present invention can realize full automation of computer control, and only needs 2 to 3 operators to perform data analysis and operation monitoring, and can produce more qualified skateboard products with higher quality, shorter time and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a thermoplastic fiber reinforced composite double-rock skateboard prepared in the present invention.

[0026] Figure 2 The present invention is a schematic diagram of the process of preparing the thermoplastic fiber reinforced composite material skateboard. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but is not intended to be limiting of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention may be combined with each other without conflict.

[0028] Example 1

[0029] This embodiment provides a method for preparing a thermoplastic fiber reinforced composite skateboard, and the specific steps are as follows:

[0030] Step 1: Prepare the extrusion blank

[0031] 1) Raw material preparation: Polypropylene (PP) is used as a thermoplastic resin, with a weight percentage of 67%; black masterbatch and silane coupling agent are used as molding processing aids, with a total weight percentage of 3%; long glass fiber is used as a fiber reinforcement material, with a weight percentage of 30%.

[0032] 2) First-stage extrusion: accurately weigh 67% of PP and 3% of a molding processing aid, mix them evenly, and feed them into the first-stage extruder inlet of a twin-screw extruder; operating conditions: the speed of the twin-screw extruder is set to 450 rpm, and the outlet die temperature is set to 230°C; perform first-stage extrusion to allow the materials to be initially melted and mixed into a resin film.

[0033] 3) Second stage extrusion: adding the molten PP resin film extruded by the first stage extruder and 30% of the cut long glass fibers to the inlet of the second stage extruder of the twin-screw extruder; operating conditions: the speed of the twin-screw extruder is set to 230 rpm, and the outlet die temperature is 230°C; performing the second stage extrusion, the fibers and the resin are fully mixed and evenly dispersed to obtain a hot melt extrusion blank.

[0034] Step 2: Preparation of hot melt reinforcement

[0035] 1) Heating treatment: The reinforced continuous fiber prepreg is placed in a continuous heating furnace for heating. The temperature of the continuous heating furnace is set to 230° C. to ensure that the material is fully heated and melted to obtain a hot-melt reinforcement material.

[0036] Step 3: Compression Molding

[0037] 1) Mold design: The mold is designed according to the size and structure of the skateboard. The mold includes a plate body area and a reinforcement area; the plate body area is used to form the main body of the skateboard, and the reinforcement area is used to increase the strength and rigidity of the skateboard.

[0038] 2) The temperature of the mold is controlled at 60°C to ensure that the material has good fluidity during the compression molding process; the hot-melt reinforcement material is added to the reinforcement area of ​​the mold, and the extruded hot-melt blank is added to the plate area of ​​the mold.

[0039] 3) Pressing: Use a high-speed, high-pressure press for pressing. The press parameters are as follows: the press slider descends at a speed of 450 mm / s, and the pressure per square centimeter is 8 MPa. Pressing, filling, and cooling are performed under high temperature and high pressure to allow the material to fully flow in the mold and fill each part, ultimately forming a complete skateboard body.

[0040] Step 4: Post-processing

[0041] 1) Cooling and shaping: After the molding is completed, the skateboard body is taken out of the mold and placed in a shaping tool to cool to room temperature for shaping.

[0042] 2) Demolding: Take out the skateboard body from the molding tooling and check whether it has met the molding requirements.

[0043] 3) Inspection: Inspect the appearance and performance of the skateboard to ensure that it meets the design requirements.

[0044] The prepared double-climbing skateboard has a tensile strength of 70Mpa, a tensile modulus of 4000Mpa, a flexural strength of 110Mpa, a flexural modulus of 3500Mpa, and a simply supported beam impact strength of 45KJ / m 2 .

[0045] Example 2

[0046] This embodiment provides a method for preparing a thermoplastic fiber reinforced composite skateboard, and the specific steps are as follows:

[0047] Step 1: Prepare the extrusion blank

[0048] 1) Raw material preparation: polyamide (PA6) as a thermoplastic resin, its weight percentage is 66%; black masterbatch, silane coupling agent and antioxidant as molding processing aids, their total weight percentage is 4%; long glass fiber as a fiber reinforcement material, its weight percentage is 30%.

[0049] 2) First-stage extrusion: 66% of PA6 and 4% of molding processing aids were accurately weighed and mixed evenly, and fed into the first-stage extruder inlet of a twin-screw extruder; operating conditions: the speed of the twin-screw extruder was set to 550 rpm, and the outlet die temperature was set to 290°C; first-stage extrusion was performed to allow the materials to be initially mixed and melted into a resin film.

[0050] 3) Second stage extrusion: adding the molten resin film extruded from the first stage extruder and 30% of the cut long glass fibers to the inlet of the second stage extruder of the twin-screw extruder; operating conditions: the speed of the twin-screw extruder is set to 250 rpm, and the outlet die temperature is set to 300°C; performing second stage mixing and extrusion to fully mix the fibers and the resin and disperse them evenly to obtain a hot melt extrusion blank.

[0051] Step 2: Preparation of hot melt reinforcement

[0052] 1) Heating treatment: The reinforced prepreg is placed in a continuous heating furnace for heating. The temperature of the continuous heating furnace is set to 290°C to ensure that the material is fully heated and melted to obtain a hot-melt reinforcement material.

[0053] Step 3: Compression Molding

[0054] 1) Mold design: The mold is designed according to the size and structure of the skateboard. The mold includes a plate body area and a reinforcement area; the plate body area is used to form the main body of the skateboard, and the reinforcement area is used to increase the strength and rigidity of the skateboard.

[0055] 2) The temperature of the mold is controlled at 100°C to ensure that the material has good fluidity during the compression molding process; the extruded blank is added to the plate area of ​​the mold, and the hot melt reinforcement material is added to the reinforcement area of ​​the mold.

[0056] 3) Compression molding: Use a high-speed, high-pressure press for compression molding. The press parameters are: the press slider descends at a speed of 450mm / s, and the pressure per square centimeter is 10Mpa; compression molding is performed under high temperature and high pressure to allow the material to fully flow in the mold and fill all parts, and finally cool and solidify to form a complete skateboard body.

[0057] Step 4: Post-processing

[0058] 1) Cooling and shaping: After the molding is completed, the skateboard body is taken out of the mold and placed in a shaping tool to cool to room temperature for shaping.

[0059] 2) Demolding: Take out the skateboard body from the molding tooling and check whether it has met the molding requirements.

[0060] 3) Inspection: Inspect the appearance and performance of the skateboard to ensure that it meets the design requirements.

[0061] The prepared double-tilt skateboard has a tensile strength of 85Mpa, a tensile modulus of 5050Mpa, a flexural strength of 150Mpa, a flexural modulus of 4850Mpa, and a simply supported beam impact strength of 60KJ / m 2 .

[0062] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of the specification and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a thermoplastic fiber reinforced composite skateboard, characterized in that: The skateboard is made of thermoplastic fiber reinforced composite material, and its preparation method comprises the following steps: Step 1: According to weight percentage, 40-80% of thermoplastic resin and 0.05-5% of molding processing aid are mixed, and added into a two-stage twin-screw extruder for first-stage extrusion, and then the molten resin film extruded by the first-stage extruder and 18-60% of fiber reinforcement material are added into the second-stage extruder inlet of the two-stage twin-screw extruder to perform second-stage extrusion to obtain an extruded hot melt blank; Step 2, heating the reinforced continuous fiber prepreg in a continuous heating furnace to obtain a hot-melt reinforcement material; Step three: Determine the weight, size and layer position of the hot-melt reinforcement material and the extruded hot-melt blank according to the structural design of the skateboard and the size of the mold, add them to the plate area and reinforcement area in the mold respectively, and then quickly close the mold, pressurize, fill the mold, and shape it, and finally obtain a thermoplastic fiber reinforced composite skateboard.

2. The method for preparing a thermoplastic fiber reinforced composite skateboard according to claim 1, characterized in that: The thermoplastic resin is one or more of PP, PA, PC and PPS.

3. The method for preparing a thermoplastic fiber reinforced composite skateboard according to claim 1, characterized in that: The fiber reinforcement material is one or more of glass fiber, carbon fiber, basalt fiber and natural plant fiber.

4. The method for preparing a thermoplastic fiber reinforced composite skateboard according to claim 3, characterized in that: The fibers are one or more of long fibers, continuous fiber fabrics and unidirectional continuous fiber tapes.

5. The method for preparing a thermoplastic fiber reinforced composite skateboard according to claim 1, characterized in that: The molding processing aid is one or more of masterbatch, coupling agent, antioxidant, impact modifier, heat stabilizer and plasticizer.

6. The method for preparing a thermoplastic fiber reinforced composite skateboard according to claim 1, characterized in that: The operating conditions of the first-stage extrusion are: a rotation speed of 400-600 rpm and an outlet die temperature of 200-290°C; the operating conditions of the second-stage extrusion are: a rotation speed of 200-300 rpm and an outlet die temperature of 200-300°C.

7. The method for preparing a thermoplastic fiber reinforced composite skateboard according to claim 1, characterized in that: The temperature of the continuous heating furnace is set at 200-300°C.

8. The method for preparing a thermoplastic fiber reinforced composite skateboard according to claim 1, characterized in that: The temperature of the mold is controlled at 40-100°C.

9. The method for preparing a thermoplastic fiber reinforced composite skateboard according to claim 1, characterized in that: The die is made of a high-speed, high-pressure press, the slide of the press descends at a speed of 300-500 mm / s, and the pressure per square centimeter is 6-10 MPa.

10. A thermoplastic fiber reinforced composite skateboard prepared by the preparation method according to any one of claims 1 to 9.

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