A device and method for preparing random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material

Abstract

The invention discloses a device and method for preparing a random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material. The device comprises a beam splitter, a doffing tube connected to the beam splitter, a fixed rod fixedly connected to the upper part of the beam splitter, and a swing rod fixedly connected to the lower part of the doffing tube. The preparation method comprises the following steps: continuous thermoplastic fibers and continuous inorganic fibers in a ratio of 10:90 to 90:10 are subjected to a filament complexing process by the device to prepare a composite material with a gram weight range of 150-3000 g / m 2 The invention mainly uses the filament entanglement method to maintain the random continuity of the inorganic fibers, and solves the problem of short length and discontinuity of the inorganic fibers in the traditional low-density thermoplastic composite materials by effectively increasing the length of the inorganic fibers in the material.

Description

Technical Field

[0001] The invention belongs to the technical field of composite materials for automobile interior and exterior decoration, and specifically relates to a device and method for preparing random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite materials. Background Art

[0002] Low-density thermoplastic composites are widely used in automotive interior and exterior trims. The main mechanism is to use the skeleton effect of inorganic fibers and obtain high-strength composites by fully impregnating inorganic fibers with thermoplastic resin. From the morphology of inorganic fibers in the product, there are mainly two states: short-cut inorganic fibers and unidirectional continuous fibers; from the preparation process, there are mainly dry non-woven processes and wet papermaking processes; from the density of the product, there are mainly high-density (density>1g / cm 3 ) and low density (density <1g / cm 3 ), the low density range is mainly distributed at 0.2g / m 3 -0.7g / cm 3 .

[0003] In the dry nonwoven process, the length of the inorganic fiber raw materials in the low-density short-cut composite material is mostly 2-10cm after cutting. After the needle punching process, the length of the inorganic fiber in the product is further reduced; in the wet papermaking process, the length of the inorganic fiber is mostly 2-4cm. If the fiber length is too long, it is not conducive to the dispersion of the fiber in the solution. From the above parameters, it can be seen that the length of the inorganic fiber is relatively limited in this type of product process, and this limitation also brings certain defects to the product. The details are as follows:

[0004] 1. When such products are used in automotive interior and exterior parts, the materials have problems such as insufficient rigidity and strength. In actual application, it is found that the strength of short inorganic fiber reinforced thermoplastic composites is proportional to the length of the inorganic fibers in the composite within a certain range.

[0005] 2. When such products are used to prepare complex shapes or large tensile parts, the application of the materials is often limited due to insufficient tensile properties. For example, when inorganic fiber-reinforced thermoplastic composite materials produced by wet papermaking process are used in automotive exterior underbody protection parts, potential problems such as water-related failures are prone to occur.

[0006] In order to improve the above shortcomings, you can choose to use unidirectional long-fiber woven materials, but this material has inherent problems such as difficulty in molding, R-angle wrinkles, and inability to stretch; you can also choose high-density inorganic fiber reinforced thermoplastic composite materials, but it has problems such as high gram weight and high fuel consumption. Summary of the invention

[0007] In order to solve the technical problems existing in the prior art, the present invention provides a device and method for preparing a random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material, which is achieved through the following technical solutions:

[0008] The invention discloses a device for preparing random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material, comprising a beam splitter, a doffing tube connected to the beam splitter, a fixed rod fixedly connected to the upper part of the beam splitter, and a swing rod fixedly connected to the lower part of the doffing tube.

[0009] As a further improvement, the beam splitting tube described in the present invention passes through the through hole opened on the fixed rod, and the beam splitting tubes are arranged in parallel. The yarn dropping tube passes through the through hole opened on the rocker rod, and the yarn dropping tubes are arranged in parallel. The connection between the beam splitting tube and the yarn dropping tube is a structure in which the yarn dropping tube covers the beam splitting tube.

[0010] As a further improvement, the two ends of the swing rod described in the present invention are respectively connected to the swing arm, the swing arm is connected to the shaft, the shaft drives the swing arm to make a circular motion, and the swing arm drives the swing rod to make a circular motion in the same plane.

[0011] As a further improvement, the doffing tube described in the present invention is an elastic doffing tube, the material of the elastic doffing tube is rubber or rubber, and an air inlet is provided on the beam splitting tube near the connection between the beam splitting tube and the doffing tube, and the upper angle A between the beam splitting tube and the air inlet is 100-170°. If the angle is too small, the fibers cannot be effectively dispersed, and if the angle is too large, the fibers are too scattered, which is not conducive to complexation. The inlet end of the air pressure beam splitting tube is designed to be a hard tube, and the outlet end is a flexible tube with a certain elasticity; so that the tube can make a circular motion.

[0012] The present invention also discloses a method for preparing a random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material, wherein continuous thermoplastic fibers and continuous inorganic fibers in a ratio of 10:90 to 90:10 are subjected to a filament complexing process by a device to prepare a composite material with a gram weight range of 150-3000 g / m 2 A random continuous coil-like low-density inorganic fiber-reinforced thermoplastic composite material, or the felt is pressed into a board.

[0013] As a further improvement, the filament complexing process implemented by the device of the present invention comprises the following steps:

[0014] 1) The continuous inorganic fiber is subjected to yarn spreading and warping treatment to form an inorganic fiber warping yarn roller for standby use;

[0015] 2) The continuous thermoplastic fiber is subjected to warping treatment to form a thermoplastic fiber warping yarn roller for standby use;

[0016] 3) Start the motor connected to the shaft, drive the swing arm to drive the swing rod, and the swing rod drives the doffing tube, the doffing tube moves in a circle, and compressed air is introduced into the air inlet;

[0017] 4) The continuous inorganic fibers in the inorganic fiber warping yarn roller and the continuous thermoplastic fibers in the thermoplastic fiber warping yarn roller are evenly bundled, and each bundle of inorganic fibers passes through the air pressure beam splitting tube and each bundle of thermoplastic fibers passes through the air pressure beam splitting tube and is arranged in the order of inorganic fibers / thermoplastic fibers / inorganic fibers / thermoplastic fibers and then penetrates into the beam splitting tube;

[0018] 5) All the fibers are dispersed in the gas phase by the compressed air in the beam splitting tube, and then move in a circular motion through the doffing tube, evenly doffing the yarn to form a random continuous ball-shaped felt.

[0019] As a further improvement, the ratio of the continuous thermoplastic fibers to the continuous inorganic fibers of the present invention is preferably 30:70-40:60.

[0020] As a further improvement, the diameter of the continuous inorganic fiber described in the present invention is between 9μm and 21μm; the continuous inorganic fiber is one or a combination of glass fiber and basalt fiber; the thermoplastic fineness of the continuous thermoplastic fiber is 1.5dtex-15dtex; the continuous thermoplastic fiber is one or a combination of polypropylene fiber, polyester fiber, and PA fiber.

[0021] As a further improvement, the melt index of the continuous thermoplastic fiber described in the present invention is 7-120g / 10min; too small a melt index will affect the resin infiltration and increase the difficulty of subsequent processing; too large a melt index will affect the material strength and aging performance; the compressed air is dried and stabilized. The presence of moisture in the compressed air will cause the fibers to stick together; the air pressure is kept constant; too small an air pressure will cause insufficient fiber dispersion, which is not conducive to mixing; too large an air pressure will destroy the dispersed shape of the fibers, which is not conducive to complexation and affects the mixing of the two fibers.

[0022] As a further improvement, after step 5), the bonding force between the continuous fibers can be enhanced by direct hot rolling, hot pressing after needle punching, or hot air consolidation, so as to have higher tear resistance; and / or by sprinkling a thermoplastic binder and then hot pressing. In this way, the bonding force between the continuous fibers can be strengthened, so as to have stronger rigidity.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. The present invention mainly uses the linear relationship between the length of inorganic fibers and the rigid strength, tensile properties and complex shapes of composite materials for automotive parts, and uses the filament complexing method to maintain the random continuity of inorganic fibers. By effectively increasing the length of inorganic fibers in the material, the problem of short length and discontinuity of inorganic fibers in traditional low-density thermoplastic composite materials is solved, thereby improving the overall rigidity and tensile properties of the composite materials. Through the design of the device of air pressure splitting tube, yarn dropping tube and guide ring and the mutual combination and interaction with continuous thermoplastic fibers and continuous inorganic fiber materials, the two fibers are mixed evenly and the materials are evenly dispersed in the complexing, which ensures the material performance. The process is simple and efficient, so that the composite materials have more excellent mechanical properties and the application of the composite materials is broadened.

[0025] 2. The present invention innovatively proposes a random continuous "coil-like" structure, which makes the material as a whole isotropic, further improves the formability of low-density inorganic fiber reinforced thermoplastic composite materials, and makes the components show good dimensional stability.

[0026] 3. The two continuous fibers of the material of the present invention are entangled together, so that the material exhibits better tear resistance.

[0027] 4. The random continuous "coil-like" low-density inorganic fiber reinforced thermoplastic composite material described in the present invention makes the inorganic fibers in the material both continuous and isotropic (i.e., homogeneous) for the first time, effectively improving the mechanical properties of the material and broadening the application of the material.

[0028] 5. The random continuous "coil-like" low-density inorganic fiber reinforced thermoplastic composite material described in the present invention has the advantages of light weight and isotropy compared with the existing woven long fiber glass fiber reinforced thermoplastic material substrate; compared with the traditional low-density inorganic fiber reinforced thermoplastic composite material, it has better mechanical properties.

[0029] 6. The upper angle A between the beam splitter and the air inlet is set to 100-170° to ensure that the compressed air blows from bottom to top to disperse the fibers and then goes out from the upper end of the beam splitter, while avoiding blowing from top to bottom. The airflow interferes with the uneven distribution of the fibers in the circular motion in the doffing tube when forming a spiral structure, thus affecting the performance of the material. The same is true for designing the air inlet on the beam splitter instead of the doffing tube to avoid affecting the distribution and shape of the fibers falling at the outlet of the doffing tube. At the same time, the upper angle A is designed to be 100-170°. If the angle is too small, the fibers cannot be effectively dispersed. If the angle is too large, the fibers are too scattered, which is not conducive to complexation.

[0030] 7. The inlet end of the air pressure splitter tube is designed to be a hard tube to facilitate the precise entry of fibers, and the outlet end is a flexible hose with a certain elasticity so that the yarn drop tube can form a spiral complex structure by making a circular motion.

[0031] 8. Set the melt index of continuous thermoplastic fiber to 7-120g / 10min. A too small melt index will affect the resin infiltration and increase the difficulty of subsequent processing; a too large melt index will affect the material strength and aging performance.

[0032] 9. Dry and stabilize the compressed air. The presence of moisture in the compressed air will cause the fibers to stick together; keep the air pressure constant; if the air pressure is too low, the fibers will not be fully dispersed, which is not conducive to mixing; if the air pressure is too high, the shape of the dispersed fibers will be destroyed, which is not conducive to complexation and affects the mixing of the two fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the material prepared by the preparation method of the present invention at room temperature;

[0034] Figure 2 It is a schematic diagram of the structure of the material prepared by the preparation method of the present invention after heating;

[0035] Figure 3 It is a structural schematic diagram of the device of the present invention;

[0036] In the figure, 1 is the shaft, 2 is the swing arm, 3 is the swing rod, 4 is the doffing tube, 5 is the beam splitting tube, 6 is the fixing rod, 7 is the air inlet, 8 is the angle A, 9 is the inorganic fiber, and 10 is the thermoplastic fiber. DETAILED DESCRIPTION

[0037] The present invention discloses a device for preparing a random continuous coil-shaped low-density inorganic fiber 9 reinforced thermoplastic composite material. Figure 3 It is a schematic diagram of the structure of the device of the present invention; the device includes a beam splitter 5, a doffing tube connected to the beam splitter 5, a fixed rod 6 fixedly connected to the upper part of the beam splitter 5, and a swing rod 3 fixedly connected to the lower part of the doffing tube. The beam splitter 5 passes through the through hole provided on the fixed rod 6, and the beam splitter 5 is arranged in parallel. The doffing tube 4 passes through the through hole provided on the swing rod 3, and the doffing tube 4 is arranged in parallel. The connection between the beam splitter 5 and the doffing tube 4 is a structure in which the doffing tube 4 covers the beam splitter 5. The two ends of the swing rod 3 are respectively connected to the swing arm 2, and the swing arm 2 is connected to the shaft 1. The shaft 1 drives the swing arm 2 to make a circular motion, and the swing arm 2 drives the swing rod 3 to make a circular motion in the same plane.

[0038] The doffing tube 4 described in the present invention is an elastic doffing tube 4, and the material of the elastic doffing tube 4 is rubber or rubber. An air inlet 7 is provided on the beam splitting tube 5, near the connection between the beam splitting tube 5 and the doffing tube 4, and the upper angle A8 between the beam splitting tube 5 and the air inlet 7 is 100-170°. The inlet end of the beam splitting tube 5 is a hard tube, which is convenient for the precise entry of the fiber, and the outlet end is a hose with a certain elasticity, so that the doffing tube 4 can form a spiral complex structure by performing a circular motion. Multiple beam splitting tubes 5 are sequentially arranged and inserted in the order of inorganic fiber 9 / thermoplastic fiber 10 / inorganic fiber 9 / thermoplastic fiber 10, and the preferred ratio of continuous thermoplastic fiber 10 to continuous inorganic fiber 9 is 30:70-40:60, the diameter of continuous inorganic fiber 9 is between 9μm-21μm, and the thermoplastic fineness of continuous thermoplastic fiber 10 is 1.5dtex-15dtex.

[0039] The yarn tube is an elastic doffing tube 4, the material of the elastic doffing tube 4 is rubber or rubber, and an air inlet 7 is provided on the beam splitting tube 5 near the connection between the beam splitting tube 5 and the doffing tube 4, and the angle between the beam splitting tube 5 and the air inlet 7 is 100-170 degrees.

[0040] A method for preparing a random continuous coil-shaped low-density inorganic fiber 9 reinforced thermoplastic composite material, wherein the continuous thermoplastic fiber 10 and the continuous inorganic fiber 9 in a ratio of 10:90 to 90:10 are subjected to a filament complexing process by a device to prepare a composite material with a gram weight range of 150-3000 g / m 2 The random continuous coil-like low-density inorganic fiber 9 is reinforced with a thermoplastic composite material, and then the felt is pressed into a board.

[0041] The filament complexing process implemented by the device includes the following steps:

[0042] 1) The continuous inorganic fiber 9 is subjected to yarn spreading and warping treatment to form an inorganic fiber warping yarn roller for standby use;

[0043] 2) The continuous thermoplastic fiber 10 is subjected to warping treatment to form a thermoplastic fiber warping yarn roller for standby use;

[0044] 3) Start the motor connected to the shaft 1, drive the swing arm 2 to drive the swing rod 3, and the swing rod 3 drives the doffing tube, the doffing tube moves in a circle, and compressed air is introduced into the air inlet 7;

[0045] 4) The continuous inorganic fibers 9 in the inorganic fiber warping yarn roller and the continuous thermoplastic fibers 10 in the thermoplastic fiber warping yarn roller are evenly bundled, and each bundle of inorganic fibers 9 passes through the air pressure bundle splitting tube 5 and each bundle of thermoplastic fibers 10 passes through the air pressure bundle splitting tube 5 and enters the bundle splitting tube 5 in the order of inorganic fibers 9 / thermoplastic fibers 10 / inorganic fibers 9 / thermoplastic fibers 10;

[0046] 5) After all the fibers are dispersed in the gas phase by the compressed air in the beam splitting tube 5, each bundle of fibers is dispersed into several fibers, and then passes through the yarn dropping tube 4 to make a circular motion, and the yarn is dropped evenly to form a random continuous yarn ball-shaped felt.

[0047] 6) by direct hot rolling, needling consolidation followed by hot pressing, hot air consolidation, and / or by sprinkling a thermoplastic binder followed by hot pressing.

[0048] The ratio of continuous thermoplastic fiber 10 to continuous inorganic fiber 9 is preferably 30:70-40:60; the diameter of continuous inorganic fiber 9 is between 9μm-21μm; continuous inorganic fiber 9 is one or a combination of glass fiber and basalt fiber; the thermoplastic fineness of continuous thermoplastic fiber 10 is 1.5dtex-15dtex; continuous thermoplastic fiber 10 is one or a combination of polypropylene fiber, polyester fiber and PA fiber.

[0049] The melt index of the continuous thermoplastic fiber 10 is 7-120 g / 10 min; the compressed air is dried and pressure-stabilized.

[0050] Figure 1 It is a schematic diagram of the structure of the material prepared by the preparation method of the present invention at room temperature; it is the fiber state of the material after spiral complexation; Figure 2 It is a schematic diagram of the structure of the material prepared by the preparation method of the present invention after heating; it is a state in which the fibers of two materials form point-like bonding after heating.

[0051] The technical solution of the present invention is further described below by means of specific embodiments in conjunction with the accompanying drawings:

[0052] Example 1

[0053] The continuous thermoplastic fiber 10 and the continuous inorganic fiber 9 are prepared in a ratio of 30:70 by using a filament complexing process to obtain a 2000 g / m 2 Random continuous "thread-like" low-density inorganic fiber 9 reinforced thermoplastic composites.

[0054] The continuous inorganic fibers 9 are glass fibers with a diameter of 9 μm.

[0055] The continuous thermoplastic fiber 10 is a polypropylene fiber with a thermoplastic fineness of 1.5 dtex and a melt index of 120 g / 10 min.

[0056] The filament complexing process is as follows:

[0057] The continuous inorganic fiber 9 is subjected to yarn spreading and warping treatment to form an inorganic fiber warping yarn roller for standby use; the continuous thermoplastic fiber 10 is subjected to warping treatment to form a thermoplastic fiber warping yarn roller for standby use; then the continuous inorganic fiber 9 in the inorganic fiber warping yarn roller is evenly divided into bundles, and each bundle of inorganic fiber 9 is passed through an air pressure tube; then the continuous thermoplastic fiber 10 in the thermoplastic fiber warping yarn roller is evenly divided into bundles, and each bundle of thermoplastic fiber 10 is passed through an air pressure tube; the air pressure beam splitting tube 5 is arranged in the order of inorganic fiber 9 / thermoplastic fiber 10 / inorganic fiber 9 / thermoplastic fiber 10; all the fibers are dispersed in the air phase through the air pressure beam splitting tube 5, and then pass through the yarn dropping tube 4 to make a circular motion, evenly drop the yarn, and form a random continuous "thread ball" felt; finally, the felt is needle-punched and consolidated and then hot-pressed into a board, marked as sample 1.

[0058] Example 2

[0059] The continuous thermoplastic fiber 10 and the continuous inorganic fiber 9 are prepared in a ratio of 30:70 by using a filament complexing process to obtain a 2000 g / m 2 Random continuous "thread-like" low-density inorganic fiber 9 reinforced thermoplastic composites.

[0060] The continuous inorganic fibers 9 are glass fibers with a diameter of 21 μm.

[0061] The continuous thermoplastic fiber 10 is a polypropylene fiber with a thermoplastic fineness of 1.5 dtex and a melt index of 120 g / 10 min.

[0062] The filament complexing process is as follows:

[0063] The continuous inorganic fiber 9 is subjected to yarn spreading and warping treatment to form an inorganic fiber warping yarn roller for standby use; the continuous thermoplastic fiber 10 is subjected to warping treatment to form a thermoplastic fiber warping yarn roller for standby use; then the continuous inorganic fiber 9 in the inorganic fiber warping yarn roller is evenly divided into bundles, and each bundle of inorganic fiber 9 is passed through an air pressure tube; then the continuous thermoplastic fiber 10 in the thermoplastic fiber warping yarn roller is evenly divided into bundles, and each bundle of thermoplastic fiber 10 is passed through an air pressure tube; the air pressure beam splitting tube 5 is arranged in the order of inorganic fiber 9 / thermoplastic fiber 10 / inorganic fiber 9 / thermoplastic fiber 10; all the fibers are dispersed in the air phase through the air pressure beam splitting tube 5, and then pass through the yarn dropping tube 4 to make a circular motion, evenly drop the yarn, and form a random continuous "thread ball" felt; finally, the felt is needle-punched and consolidated and then hot-pressed into a board, marked as sample 2.

[0064] Example 3

[0065] The continuous thermoplastic fiber 10 and the continuous inorganic fiber 9 are prepared in a ratio of 30:70 by using a filament complexing process to obtain a 2000 g / m 2Random continuous "thread-like" low-density inorganic fiber 9 reinforced thermoplastic composites.

[0066] The continuous inorganic fibers 9 are glass fibers with a diameter of 9 μm.

[0067] The continuous thermoplastic fiber 10 is a polypropylene fiber with a thermoplastic fineness of 15 dtex and a melt index of 7 g / 10 min.

[0068] The filament complexing process is as follows:

[0069] The continuous inorganic fiber 9 is subjected to yarn spreading and warping treatment to form an inorganic fiber warping yarn roller for standby use; the continuous thermoplastic fiber 10 is subjected to warping treatment to form a thermoplastic fiber warping yarn roller for standby use; then the continuous inorganic fiber 9 in the inorganic fiber warping yarn roller is evenly divided into bundles, and each bundle of inorganic fiber 9 is passed through an air pressure tube; then the continuous thermoplastic fiber 10 in the thermoplastic fiber warping yarn roller is evenly divided into bundles, and each bundle of thermoplastic fiber 10 is passed through an air pressure tube; the air pressure beam splitting tube 5 is arranged in the order of inorganic fiber 9 / thermoplastic fiber 10 / inorganic fiber 9 / thermoplastic fiber 10; all the fibers are dispersed in the air phase through the air pressure beam splitting tube 5, and then pass through the yarn dropping tube 4 to make a circular motion, evenly drop the yarn, and form a random continuous "thread ball" felt; finally, the felt is needle-punched and consolidated and then hot-pressed into a board, marked as sample 3.

[0070]

[0071] Note: The test method is based on Toyota underbody protection. The tear strength is ≥180N at room temperature and ≥48N when immersed in water. The bending strength is ≥10N at room temperature and ≥10N when immersed in water.

[0072] The samples of Examples 1 to 3 can be applied to automobile exterior parts, such as underbody guards and the like.

[0073] Example 4

[0074] The continuous thermoplastic fiber 10 and the continuous inorganic fiber 9 are prepared in a ratio of 40:60 by using a filament complexing process to obtain a 150 g / m 2 Random continuous "thread-like" low-density inorganic fiber 9 reinforced thermoplastic composites.

[0075] The continuous inorganic fibers 9 are glass fibers with a diameter of 9 μm.

[0076] The continuous thermoplastic fiber 10 is a polypropylene fiber with a thermoplastic fineness of 1.5 dtex and a melt index of 120 g / 10 min.

[0077] The filament complexing process is as follows:

[0078] The continuous inorganic fibers 9 are subjected to yarn spreading and warping treatment to form an inorganic fiber warping yarn roller for standby use; the continuous thermoplastic fibers 10 are subjected to warping treatment to form a thermoplastic fiber warping yarn roller for standby use; then the continuous inorganic fibers 9 in the inorganic fiber warping yarn roller are evenly divided into bundles, and each bundle of inorganic fibers 9 is passed through an air pressure tube; then the continuous thermoplastic fibers 10 in the thermoplastic fiber warping yarn roller are evenly divided into bundles, and each bundle of thermoplastic fibers 10 is passed through an air pressure tube; the air pressure beam splitting tubes 5 are arranged in the order of inorganic fibers 9 / thermoplastic fibers 10 / inorganic fibers 9 / thermoplastic fibers 10; all the fibers are dispersed in the air phase through the air pressure beam splitting tubes 5, and then pass through the yarn dropping tubes 4 to make a circular motion, evenly drop the yarn, and form a random continuous "thread ball-like" felt; mark sample 4.

[0079] Example 5

[0080] The continuous thermoplastic fiber 10 and the continuous inorganic fiber 9 are prepared in a ratio of 40:60 by using a filament complexing process to obtain a 150 g / m 2 Random continuous "thread-like" low-density inorganic fiber 9 reinforced thermoplastic composites.

[0081] The continuous inorganic fibers 9 are glass fibers with a diameter of 9 μm.

[0082] The continuous thermoplastic fiber 10 is a polypropylene fiber with a thermoplastic fineness of 15 dtex and a melt index of 7 g / 10 min.

[0083] The filament complexing process is as follows:

[0084] The continuous inorganic fibers 9 are subjected to yarn spreading and warping treatment to form an inorganic fiber warping yarn roller for standby use; the continuous thermoplastic fibers 10 are subjected to warping treatment to form a thermoplastic fiber warping yarn roller for standby use; then the continuous inorganic fibers 9 in the inorganic fiber warping yarn roller are evenly divided into bundles, and each bundle of inorganic fibers 9 is passed through an air pressure tube; then the continuous thermoplastic fibers 10 in the thermoplastic fiber warping yarn roller are evenly divided into bundles, and each bundle of thermoplastic fibers 10 is passed through an air pressure tube; the air pressure beam splitting tubes 5 are arranged in the order of inorganic fibers 9 / thermoplastic fibers 10 / inorganic fibers 9 / thermoplastic fibers 10; all the fibers are dispersed in the air phase through the air pressure beam splitting tubes 5, and then pass through the yarn dropping tubes 4 to make a circular motion, evenly drop the yarn, and form a random continuous "thread ball-like" felt; mark the sample 5.

[0085]

[0086]

[0087] Example 6

[0088] The continuous thermoplastic fiber 10 and the continuous inorganic fiber 9 are prepared in a ratio of 45:55 by using a filament complexing process to obtain a 2000 g / m 2 Random continuous "thread-like" low-density inorganic fiber 9 reinforced thermoplastic composites.

[0089] The continuous inorganic fibers 9 are glass fibers with a diameter of 21 μm.

[0090] The continuous thermoplastic fiber 10 is a polypropylene fiber with a thermoplastic fineness of 15 dtex and a melt index of 7 g / 10 min.

[0091] The filament complexing process is as follows:

[0092] The continuous inorganic fiber 9 is subjected to yarn spreading and warping treatment to form an inorganic fiber warping yarn roller for standby use; the continuous thermoplastic fiber 10 is subjected to warping treatment to form a thermoplastic fiber warping yarn roller for standby use; then the continuous inorganic fiber 9 in the inorganic fiber warping yarn roller is evenly divided into bundles, and each bundle of inorganic fiber 9 is passed through an air pressure tube; then the continuous thermoplastic fiber 10 in the thermoplastic fiber warping yarn roller is evenly divided into bundles, and each bundle of thermoplastic fiber 10 is passed through an air pressure tube; the air pressure beam splitting tube 5 is arranged in the order of inorganic fiber 9 / thermoplastic fiber 10 / inorganic fiber 9 / thermoplastic fiber 10; all the fibers are dispersed in the air phase through the air pressure beam splitting tube 5, and then pass through the yarn dropping tube 4 to make a circular motion, evenly drop the yarn, and form a random continuous "thread ball" felt; finally, after sprinkling a thermoplastic adhesive, it is hot pressed into a plate and marked as sample 6.

[0093] Comparative Example 1

[0094] The chopped polypropylene fiber with a mass fraction of 45% and the chopped glass fiber with a mass fraction of 55% were opened by an opener, cross-laid, and then infrared-baked at 140°C. The fibers were needle-punched with a conical needle head, a needle depth of 7 mm, and a needle density of 45 to obtain a chopped fiber reinforced thermoplastic polypropylene composite felt, which was then needle-punched and consolidated and hot-pressed into a GMT board with a gram weight of 2000 g / m 2 Label sample 7.

[0095]

[0096]

[0097] From the above comparison cases, we can see that the performance of continuous fiber samples is several times higher than that of shear fiber samples. Because the fiber length has undergone a fundamental change, the performance of the composite board has also changed by multiples. And for the same continuous fiber sample, different fiber ratios will also have a certain impact on the performance.

[0098] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A device for preparing a random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material, characterized in that: The device comprises a beam splitting tube (5), a yarn dropping tube (4) connected to the beam splitting tube (5), a fixing rod (6) fixedly connected to the upper part of the beam splitting tube (5), and a swing rod (3) fixedly connected to the lower part of the yarn dropping tube (4); the beam splitting tube (5) passes through a through hole provided on the fixing rod (6), and the beam splitting tubes (5) are arranged in parallel; the yarn dropping tubes (4) pass through a through hole provided on the swing rod (3), and the yarn dropping tubes (4) are arranged in parallel; the beam splitting tubes (5) and the yarn dropping tubes (4) are arranged in parallel; The connection between the doffing tubes (4) is a structure in which the doffing tube (4) covers the beam splitting tube (5); the two ends of the swing rod (3) are respectively connected to the swing arm (2); the swing arm (2) is connected to the shaft (1); the shaft (1) drives the swing arm (2) to make a circular motion; the swing arm (2) drives the swing rod (3) to make a circular motion in the same plane; the upper side angle A (8) formed between the beam splitting tube (5) and the air inlet (7) is 100-170°; The filament complexing process implemented by the device includes the following steps: 1) The continuous inorganic fiber is subjected to yarn spreading and warping treatment to form an inorganic fiber warping yarn roller for standby use; 2) The continuous thermoplastic fiber is subjected to warping treatment to form a thermoplastic fiber warping yarn roller for standby use; 3) starting a motor connected to the shaft (1), driving the swing arm (2) to drive the swing rod (3), and the swing rod (3) drives the doffing tube (4), the doffing tube (4) performs a circular motion, and compressed air is introduced into the air inlet (7); 4) the continuous inorganic fibers (9) in the inorganic fiber warping yarn roller and the continuous thermoplastic fibers (10) in the thermoplastic fiber warping yarn roller are evenly bundled, and each bundle of inorganic fibers (9) and each bundle of thermoplastic fibers (10) are passed through the air pressure bundle splitting tube (5) and are arranged in the order of inorganic fibers (9) / thermoplastic fibers (10) / inorganic fibers (9) / thermoplastic fibers (10) and are inserted into the bundle splitting tube (5); 5) All the fibers are dispersed in the gas phase by the compressed air in the beam splitting tube (5), and then pass through the doffing tube (4) to make a circular motion, and the yarns are evenly doffed to form a random continuous coil-shaped felt.

2. The device for preparing a random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material according to claim 1, characterized in that: The doffing tube (4) is an elastic doffing tube made of rubber. An air inlet (7) is provided on the beam splitting tube (5) near the connection between the beam splitting tube (5) and the doffing tube (4).

3. A method for preparing a random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material by the device according to claim 1 or 2, characterized in that: The continuous thermoplastic fiber (10) and the continuous inorganic fiber (9) in a ratio of 10:90 to 90:10 are subjected to a filament complexing process by a device to prepare a filament having a gram weight range of 150-3000 g / m 2 The random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material is then pressed into a plate by the felt. The filament complexing process implemented by the device includes the following steps: 1) The continuous inorganic fiber is subjected to yarn spreading and warping treatment to form an inorganic fiber warping yarn roller for standby use; 2) The continuous thermoplastic fiber is subjected to warping treatment to form a thermoplastic fiber warping yarn roller for standby use; 3) starting a motor connected to the shaft (1), driving the swing arm (2) to drive the swing rod (3), and the swing rod (3) drives the doffing tube (4), the doffing tube (4) performs a circular motion, and compressed air is introduced into the air inlet (7); 4) the continuous inorganic fibers (9) in the inorganic fiber warping yarn roller and the continuous thermoplastic fibers (10) in the thermoplastic fiber warping yarn roller are evenly bundled, and each bundle of inorganic fibers (9) and each bundle of thermoplastic fibers (10) are passed through the air pressure bundle splitting tube (5) and are arranged in the order of inorganic fibers (9) / thermoplastic fibers (10) / inorganic fibers (9) / thermoplastic fibers (10) and are inserted into the bundle splitting tube (5); 5) All the fibers are dispersed in the gas phase by the compressed air in the beam splitting tube (5), and then pass through the doffing tube (4) to make a circular motion, and the yarns are evenly doffed to form a random continuous coil-shaped felt.

4. The method for preparing the random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material according to claim 3, characterized in that: The ratio of the continuous thermoplastic fibers (10) to the continuous inorganic fibers (9) is 30:70-40:

60.

5. The method for preparing the random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material according to claim 4, characterized in that: The diameter of the continuous inorganic fiber (9) is between 9 μm and 21 μm; the continuous inorganic fiber (9) is one of glass fiber and basalt fiber or a combination of two of them; the thermoplastic fineness of the continuous thermoplastic fiber (10) is 1.5 dtex-15 dtex; the continuous thermoplastic fiber (10) is one of polypropylene fiber, polyester fiber and PA fiber or a combination of several thereof.

6. The method for preparing the random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material according to claim 4 or 5, characterized in that: The melt index of the continuous thermoplastic fiber (10) is 7-120 g / 10 min; the compressed air is dried and pressure-stabilized.

7. The method for preparing the random continuous coil-shaped low-density inorganic fiber reinforced thermoplastic composite material according to claim 6, characterized in that: After step 5), the product is directly hot-rolled, hot-pressed after needle punching, hot-air consolidated, and / or hot-pressed after sprinkling a thermoplastic binder.

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