CN210082172U - Long fiber reinforced thermoplastic composite material infiltration mold - Google Patents
Long fiber reinforced thermoplastic composite material infiltration mold Download PDFInfo
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- CN210082172U CN210082172U CN201920889833.6U CN201920889833U CN210082172U CN 210082172 U CN210082172 U CN 210082172U CN 201920889833 U CN201920889833 U CN 201920889833U CN 210082172 U CN210082172 U CN 210082172U
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Abstract
The utility model discloses a long fiber reinforced thermoplastic composite material infiltration mold, which comprises an upper compression roller and a fixing component thereof, a lower compression roller and a fixing component thereof, a mold shell, a lifting mechanism, a heating mechanism, a molten pool transition section and a connecting flange, wherein the mold shell comprises a mold side wall, a mold upper cover plate and a mold lower cover plate; the upper compression roller and the lower compression roller are parallel to each other and arranged at intervals; and through holes for resin to flow out are formed in the upper pressing roller and the lower pressing roller. Through adopting liftable to go up the compression roller and combine static lower compression roller, set up the resin overflow hole that provides resin on the contact surface of last compression roller and lower compression roller and fibre, through the continuous, even interpolation of resin overflow hole on the compression roller, can promote fibrous infiltration efficiency and effect. The design of apron under the mould need not open under the condition of mould upper cover, can clear up remaining resin in the mould fast, cleanly, effectively promotes the production efficiency of fibre reinforced thermoplastic composite master batch.
Description
Technical Field
The utility model belongs to the technical field of the fibre is soaked, especially, relate to a mould is soaked to long fiber reinforced thermoplastic composite.
Background
Internationally, the production of long fiber reinforced thermoplastic composites (LFT) usually employs a fiber infiltration technique, which is carried out by: firstly, drawing a fiber bundle through a die filled with liquid resin, dispersing the fiber in the die through a tensioning mechanism, and simultaneously infiltrating the fiber with the resin; then, drawing the fiber bundle soaked with the resin out of the mould for air cooling and water cooling, and obtaining a continuous composite material slender rod after cooling; and finally, cutting and granulating by using a cutting machine to obtain the long fiber reinforced thermoplastic composite material master batch. The core technology of the preparation process is fiber infiltration mold. The mould is usually composed of three parts of an upper cover, a lower cover and a parent body which are separated, and 3-5 levers for dispersing fibers are arranged in the mould. Before production, the upper cover of the die is opened, fiber yarns are threaded, and then the upper cover is covered, so that the production is started. The mould parent body is a cavity with a certain height and provided with a high-low lever. The usual lever serves the purpose of only dispersing the fiber bundle. In the production process, once the yarn breakage phenomenon occurs or the yarn is used for replacing a new yarn, the upper cover of the mold is required to be opened, and the residual resin in the mold is cleaned so as to prevent the residual resin from influencing the normal operation after being cured. The currently adopted residual resin cleaning method is as follows: and opening the upper cover of the mold after the machine is stopped, and manually cleaning the residual resin in the mold by using tools such as a metal shovel and the like. During cleaning, the mold still has a relatively high temperature, however, the resin may be in a viscous state or already solidified due to cooling. The cleaning process is easy to damage the inner wall of the mold and takes long time, about 0.5-1 hour. In addition, the key factor of the LFT technology is the infiltration of the fiber, the fiber is only infiltrated through a liquid resin tank, or part of the fiber cannot be infiltrated, the yarn drying phenomenon occurs, and the quality of master batches is influenced. Therefore, if a new mold technology can be invented, the residual resin in the mold can be quickly cleaned, the production efficiency can be greatly improved, the infiltration effect of the fiber can be improved, and the method has important practical significance for improving the LFT production efficiency and the high-quality composite master batch.
SUMMERY OF THE UTILITY MODEL
In view of the current situation, the utility model discloses a novel LFT mould technique. The mould has the following effects: firstly, the technology of quickly cleaning the residual resin in the mould and secondly the technology of improving the fiber infiltration effect. On the basis of the two effects, time and labor can be greatly saved, so that the production efficiency of LFT material master batches is greatly improved, and meanwhile, the fiber infiltration effect can be obviously improved. The specific technical scheme is as follows:
a long fiber reinforced thermoplastic composite material infiltration mold comprises an upper compression roller and a fixing component thereof, a lower compression roller and a fixing component thereof, a mold shell, a lifting mechanism, a heating mechanism, a molten pool transition section and a connecting flange,
the mould shell comprises a mould side wall, a mould upper cover plate and a mould lower cover plate;
the upper compression roller and the lower compression roller are parallel to each other and arranged at intervals;
the lower pressing roller is a static pressure roller and is fixed on the side wall of the die through a fixing assembly;
the upper compression roller is a dynamic pressure roller, is connected with the lifting mechanism through a fixing assembly and rises and falls under the control of the lifting mechanism;
a yarn inlet hole and a yarn outlet hole for fibers to pass through are formed in the side wall of the die parallel to the directions of the upper pressing roller and the lower pressing roller;
a groove-shaped rail is arranged on the side wall of the die fixed by the lower pressing roller, and a fixing component of the upper pressing roller is matched with the groove-shaped rail, so that the upper pressing roller can slide up and down along the groove-shaped rail on the side wall of the die;
the upper pressing roller and the lower pressing roller comprise semi-cylindrical pressing rollers which are contacted with fibers and heating parts which are fixedly connected with the pressing rollers, semicircular partition plates are arranged on the arc-shaped surfaces of the pressing rollers at intervals, cavities for conveying resin are axially arranged in the pressing rollers of the upper pressing roller and the lower pressing roller, and resin overflow holes communicated with the cavities are formed between the partition plates; the heating part of the press roller comprises a heating part shell, a lead laid in the heating part shell and an electric heater which is communicated through the lead and is positioned outside the die;
one end of the molten pool transition section is fixedly communicated with the extruder through a connecting flange, the other end of the molten pool transition section is fixedly communicated with the side wall of the mold, a resin channel is arranged in the molten pool transition section, and resin supplied by the extruder flows into the molten pool transition section through the flange and is conveyed into axial cavities of the upper compression roller and the lower compression roller through the channel of the molten pool transition section.
The compression roller surface is fixedly connected with the heating part through bolts.
The upper compression roller, the lower compression roller, the fixing component of the upper compression roller and the fixing component of the lower compression roller are all provided with through holes for resin to flow out, the resin flows out from the extruder and passes through the transition section of the molten pool, then enters the cavity of the compression roller through the through holes of the fixing component and the through holes of the compression roller, and finally overflows from the resin overflow hole and then is in contact with and infiltrated by fibers.
The heating mechanism comprises an electric heating pipe and an electric heating pipe lead which are arranged on the side wall of the mould shell, an electric heating rod and an electric heating rod lead which are inserted into the upper cover plate of the mould and the lower cover plate of the mould, and an electric heater which is connected with the electric heating pipe lead and the electric heating rod lead and is positioned outside the mould.
Preferably, the yarn inlet hole and the yarn outlet hole of the same fiber bundle, the resin overflow hole of the upper pressing roll and the resin overflow hole of the lower pressing roll are positioned on the same vertical plane, and the fibers are further spread under the action of pressure, so that the twisting and scraping of the fibers are avoided, and the breakage of the fibers caused by the twisting and scraping is reduced.
The lifting mechanism is a manual screw rod lifter or an electric screw rod lifter, and each upper pressing roller is independently connected with one screw rod lifter to realize independent adjustment.
Preferably, the compression roller baffle is provided with a rectangular groove sunken to the circular direction of the compression roller along the axial direction of the compression roller, the rectangular groove is 2mm long and 6mm wide, the bottom of the rectangular groove is provided with a resin overflow hole, and the resin overflow hole is a round hole with the diameter of 0.8-2 mm. The recessed rectangular grooves need to be chamfered to avoid passing fibers being scratched by the edges.
Preferably, the novel mold for improving the fiber infiltration effect and the production efficiency of the long fiber reinforced thermoplastic composite material further comprises a yarn inlet support arranged in the yarn inlet direction and a product support arranged in the yarn outlet direction, wherein the yarn inlet support is positioned outside the infiltration mold.
When the fiber drawing device is used, the upper pressing roller descends, fibers are wavy between the upper pressing roller and the lower pressing roller under the traction of the yarn outlet direction traction device, and the upper pressing roller and the lower pressing roller have certain pressure on the fibers in the tangential direction, so that the fiber dispersing effect can be promoted, and the resin overflowing from the resin overflow holes of the upper pressing roller and the lower pressing roller can be promoted to fully permeate into fiber bundles. Because the contact surfaces of the upper pressing roller and the lower pressing roller with the fibers are circular arc surfaces, the breakage of the fibers is reduced.
Preferably, the infiltration mold is fixedly arranged on the bracket, and the infiltration channel, the extruder and the connecting flange are kept on the same horizontal plane.
Preferably, the lower die cover plate is rotatably connected with the side wall of the die through a hinge, a fastening bolt is arranged on the opposite side of the hinge to tightly connect the lower die cover plate with the side wall of the die, and the hinge and the fastening bolt are used for controlling the lower die cover plate to be opened and closed quickly, so that resin leakage is avoided. When the resin in the mold needs to be cleaned, the fastening bolt is unscrewed, the lower cover plate of the mold is opened, and the resin is poured out of the mold automatically. The rotation axis of the cover plate in connection with the mould ensures that the panel does not completely leave the mould, but hangs on it. The cover plate can be opened at an angle of 90 degrees and is vertical to the ground.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the resin is continuously and uniformly added through the cavity arranged in the compression roller and is contacted with the fiber inflow port (namely the resin overflow hole), and the infiltration efficiency and effect can be improved by combining the lifting of the compression roller;
2. the tension force on the fiber yarn generated on the contact surfaces of the upper pressing roller and the lower pressing roller and the fiber yarn is beneficial to the penetration of resin into the fiber yarn, and the fiber and the resin are directly contacted on the surface of the pressing roller under the action of the pressure of the upper pressing roller and the lower pressing roller and the traction force of a traction machine, so that the infiltration effect of the fiber is further improved;
3. the whole mold is sealed, can continuously work for a long time without opening, and avoids material oxidation caused by opening the mold midway and resin solidification caused by cooling;
4. the resin remained in the die can be cleaned quickly and cleanly under the condition that the upper cover of the die does not need to be opened. Compared with the prior art, the process saves a large amount of time and labor, thereby effectively improving the production efficiency of the fiber reinforced thermoplastic composite master batch and avoiding scratching the die wall due to forced hanging of resin curing.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
FIG. 1 is a flow chart of infiltration of a long fiber-reinforced thermoplastic composite;
FIG. 2 is a perspective view of a long fiber-reinforced thermoplastic composite infiltration mold according to the present invention;
FIG. 3 is a perspective view of the structure of the FIG. 2 counter-angled infiltration mold;
FIG. 4 is a front view of a structure of a filament reinforced thermoplastic composite infiltration mold according to the present invention;
FIG. 5 is a perspective view of a middle press roll structure of a infiltration mold for a long fiber reinforced thermoplastic composite material provided by the present invention;
FIG. 6 is a top view of a middle press roll structure of a filament reinforced thermoplastic composite infiltration mold according to the present invention;
FIG. 7 is a schematic view of an open structure of a lower cover plate of a infiltration mold for long fiber reinforced thermoplastic composite materials according to the present invention;
FIG. 8 is a schematic view of a resin flow channel in a filament reinforced thermoplastic composite infiltration mold according to the present invention;
FIG. 9 is a schematic view of a fiber channel in a infiltration mold for a long fiber reinforced thermoplastic composite material according to the present invention;
FIG. 10 is a cross-sectional view of the glass fiber reinforced polypropylene composite masterbatch;
FIG. 11 is a cross-sectional view of a master batch of the stainless steel fiber reinforced nylon 6 composite material;
FIG. 12 stainless steel fiber reinforced nylon 6 composite resistivity as a function of stainless steel fiber weight fraction;
fig. 13 stainless steel fiber reinforced nylon 6 composite electromagnetic shielding effectiveness.
Wherein, 1-upper press roll, 2-lower press roll, 3-mould shell, 4-lifting mechanism, 5-heating mechanism, 6-molten pool transition section, 7-connecting flange, 8-yarn feeding support, 9-product support and 10-mould support;
11-press roll heating part, 12-lead channel, 13-clapboard, 14-press roll cavity, 15-resin overflow hole, 31-mould side wall, 32-mould upper cover plate, 33-mould lower cover plate, 311-yarn inlet hole, 312-yarn outlet hole, 34-groove track, 331-fastening hole and 332-fastening bolt.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The infiltration flow of the long fiber reinforced thermoplastic composite material is that, as shown in fig. 1, resin enters an infiltration mold in a molten state after passing through an extruder; the fiber is placed on a creel, enters an infiltration mold after passing through a dispersion roller and a preheating device, finishes the infiltration process of the resin on the fiber in the mold, pulls the prepreg strip out of the infiltration mold by a tractor, and then cools, shapes and cuts the prepreg into granules, thus obtaining the master batch of the composite material.
The utility model provides an infiltration mould, infiltration mould can show the effect of soaking that provides the fibre yarn in the resin, simultaneously more convenient and practical in the aspect of the mould clearance.
Example 1: the utility model provides a mould structure.
A long fiber reinforced thermoplastic composite material infiltration mold is shown in figures 2, 3 and 8 and comprises an upper compression roller 1 and a fixing component thereof, a lower compression roller 2 and a fixing component thereof, a mold shell 3, a lifting mechanism 4, a heating mechanism 5, a molten pool transition section 6 and a connecting flange 7;
the mold housing 3 includes a mold side wall 31, a mold upper cover plate 32, and a mold lower cover plate 33;
the upper compression roller and the lower compression roller are parallel to each other and arranged at intervals;
the lower pressing roller 2 is a static pressure roller and is fixed on the side wall of the die through a fixing component;
the upper press roll 4 is a dynamic pressure roll, is connected with the lifting mechanism through a fixing assembly and rises and falls under the control of the lifting mechanism;
a yarn inlet hole 311 and a yarn outlet hole 312 for fiber to pass through are arranged on the side wall of the die parallel to the directions of the upper pressing roller and the lower pressing roller;
as shown in fig. 7, a groove-shaped track 34 is arranged on the side wall of the die fixed by the lower pressing roller, and a fixing component of the upper pressing roller is matched with the groove-shaped track to realize that the upper pressing roller slides up and down along the groove-shaped track on the side wall of the die;
as shown in fig. 4 and 5, the upper and lower compression rollers include a semi-cylindrical compression roller contacting with the fiber and a compression roller heating part 11 fixedly connected with the compression roller, a wire passage 12 for a wire to pass through is arranged in the compression roller heating part 11, semicircular partition plates 13 are arranged on the arc-shaped surface of the compression roller at intervals, a cavity 14 for conveying resin is axially arranged in the compression roller of the upper and lower compression rollers, and a resin overflow hole 15 communicating with the cavity is formed between the partition plates, as shown in fig. 6; the heating part of the press roller comprises a heating part shell, a lead laid in the heating part shell and an electric heater which is communicated through the lead and is positioned outside the die;
as shown in fig. 8, one end of the molten pool transition section is fixedly communicated with the connecting flange 7 to the extruder, the other end is fixedly communicated with the side wall of the mold, a resin channel is arranged in the molten pool transition section, and resin supplied by the extruder flows into the molten pool transition section 6 through the flange and is then conveyed into axial cavities of the upper pressure roller and the lower pressure roller through the channel of the molten pool transition section.
The compression roller surface is fixedly connected with the heating part through bolts.
In this application go up the compression roller and fixed subassembly thereof includes the fixed subassembly of last compression roller and last compression roller, lower compression roller and fixed subassembly thereof includes the fixed subassembly of lower compression roller and lower compression roller, it is the same with lower compression roller structure to go up the compression roller, the arc compression roller face of going up the compression roller when the installation is downwards, the arc compression roller face of lower compression roller upwards, it sets up with lower compression roller interval to go up the compression roller, thereby make the tow be even wave, as shown in figure 9, the fixed subassembly of going up the compression roller is the same with the fixed subassembly structure of lower compression roller, it is connected with elevating system to go up the compression roller respectively, will push down the roller and fix on the mould lateral wall.
The upper compression roller, the lower compression roller, the fixing component of the upper compression roller and the fixing component of the lower compression roller are all provided with through holes for resin to flow out, the resin flows out from the extruder, passes through the transition section of the molten pool, then enters the cavity 14 of the compression roller through the through holes of the fixing component and the through holes of the compression roller, and then overflows from the resin overflow hole 15 and then contacts and soaks with the fibers.
Go up the compression roller and pass through fixed connection such as being connected of fixed subassembly and elevating system, the holding down roller passes through fixed establishment and mould lateral wall and all adopts bolted connection, and bolted connection is the fastening connection mode commonly used in machinery, no longer the one-to-one description.
The heating mechanism comprises an electric heating pipe and an electric heating pipe lead which are arranged on the side wall of the mould shell, an electric heating rod and an electric heating rod lead which are inserted into the upper cover plate of the mould and the lower cover plate of the mould, and an electric heater which is connected with the electric heating pipe lead and the electric heating rod lead and is positioned outside the mould.
The yarn inlet hole, the yarn outlet hole, the resin overflow hole of the upper press roll and the resin overflow hole of the lower press roll are in the same straight line, and the fibers are further unfolded under the action of the tension force, so that the fibers are prevented from being twisted and scraped, and the breakage of the fibers caused by the twisting and scraping is reduced.
The lifting mechanism is a manual screw rod lifter or an electric screw rod lifter, and each upper pressing roller is independently connected with one screw rod lifter to realize independent adjustment.
The pressing roller is characterized in that a rectangular groove sunken to the circular direction of the pressing roller is formed in the axial direction of the pressing roller between the pressing roller partition plates, the length of the rectangular groove is 2mm, the width of the rectangular groove is 6mm, a resin overflow hole is formed in the bottom of the rectangular groove, and the resin overflow hole is a round hole with the diameter of 0.8-2 mm. The recessed rectangular grooves need to be chamfered to avoid passing fibers being scratched by the edges. The novel mould for improving the fiber infiltration effect and the production efficiency of the long fiber reinforced thermoplastic composite material further comprises a yarn inlet support 8 and a product support 9, wherein the yarn inlet support 8 and the product support 9 are located outside the infiltration mould and arranged in the yarn inlet direction and the yarn outlet direction of fiber yarns.
The utility model provides an infiltration mould has changed the joining mode of resin, and resin is added through the cavity that sets up in the compression roller continuously, evenly, contacts with the fibre inflow mouth (be resin overflow hole), combines the lift of compression roller, can promote infiltration efficiency and effect; the whole mold is sealed, can continuously work for a long time without opening, and avoids material oxidation caused by opening the mold halfway and resin solidification caused by cooling.
When the fiber drawing device is used, the upper pressing roller descends, fibers are wavy between the upper pressing roller and the lower pressing roller under the traction of the yarn outlet direction traction device, and the upper pressing roller and the lower pressing roller have certain tension on the fibers in the tangential direction, so that the fiber dispersing effect can be promoted, and the resin overflowing from the resin overflow holes of the upper pressing roller and the lower pressing roller can be promoted to fully permeate into fiber bundles. Because the contact surfaces of the upper pressing roller and the lower pressing roller with the fibers are circular arc surfaces, the breakage of the fibers is reduced.
The infiltration mold is fixedly arranged on the mold bracket 10, and the infiltration channel, the extruder and the connecting flange are kept on the same horizontal plane.
The die lower cover plate 33 is rotatably connected with the side wall of the die through a hinge, a fastening hole 331 is formed in the edge of the die lower cover plate and used for penetrating and fixing a fastening bolt 332, the fastening bolt 332 is arranged on the opposite side of the hinge to tightly connect the die lower cover plate with the side wall of the die, and the hinge and the fastening bolt are used for controlling the die lower cover plate to be opened and closed quickly, so that resin leakage is avoided. When the resin in the mold needs to be cleaned, the fastening bolt is unscrewed, the lower cover plate of the mold is opened, and the resin is poured out of the mold automatically. The rotation axis of the cover plate in connection with the mould ensures that the panel does not completely leave the mould, but hangs on it. The cover plate can be opened at an angle of 90 degrees and is vertical to the ground.
The working process of the lower cover plate of the mold which can be opened and closed is as follows: under the condition of working state, the lower cover plate of the mold is in a closed state, the bolt is screwed tightly, the production line is in a working state, and liquid resin is filled into the mold; under the condition of a shutdown state, the extruder stops feeding, and residual resin is left in the die and is positioned at the bottom of the die; opening the lower cover plate of the mold, and automatically discharging the residual resin to the ground or the container; once the resin is drained, the lower cover plate of the mold is closed again, the bolts are screwed, and the production line can continue to work. Compared with the traditional cleaning process for opening the upper cover plate of the mold, the efficiency of the process is greatly improved. The residual resin in the die can be cleaned quickly and cleanly. Compared with the prior art, the process saves time and labor, thereby improving the production efficiency of the fiber reinforced thermoplastic composite master batch.
As a typical example, the infiltration mold includes three upper press rolls and four lower press rolls. The upper compression roller and the lower compression roller are made of stainless steel materials; the size of the cavity in the die is variable, and is adjusted according to the number of yarns, and the approximate range is as follows: the length is 200-.
The radius range of the upper pressing roller and the lower pressing roller in the infiltration mould is 2.5-5 cm, and the horizontal distance between the edges of the pressing rollers is 5-10 cm. In the soaking process, the upper pressing roller moves to be level with the lower pressing roller, the upper edges of the upper pressing roller and the lower pressing roller are taken as horizontal lines, and the movable upper pressing roller can move upwards and downwards within the range of 0-5 cm and 0-10 cm.
As a typical example, in the first mold, the radii of the upper pressure roller and the lower pressure roller are both 2.5 cm, the horizontal distance is 5 cm, during the soaking process, the upper pressure roller moves to be horizontally level with the lower pressure roller, and with the upper edges of the upper pressure roller and the lower pressure roller at this time as a horizontal line, the movable upper pressure roller can move up and down within the range of 0-5 cm upwards and 0-10 cm downwards.
In another typical embodiment, in the second mold, the radii of the upper pressing roller and the lower pressing roller are both 5 cm, the horizontal distance is 10 cm, the upper pressing roller moves to be horizontally flush with the lower pressing roller in the soaking process, the upper edges of the upper pressing roller and the lower pressing roller are taken as a horizontal line at the moment, and the movable upper pressing roller can move up and down within the range of 0-5 cm upwards and 0-10 cm downwards. Because the radius of the press rolls of the first die and the second die is different, the contact length of the fibers on the press rolls of the dies is different, and different radii are designed to research the influence on the infiltration effect.
The die shell can be made of stainless steel, wear-resistant steel, heat-resistant steel or ordinary steel with a coating on the surface.
Example 2: infiltration process of long fiber reinforced thermoplastic composite material
The utility model provides a long fiber reinforced thermoplastic composite's infiltration technology, adopts the utility model provides a mould, including following step:
opening a die, and enabling fibers to pass through a yarn inlet and a yarn outlet of the die;
step two, closing the mold, opening the electric heater, and raising the temperature of the mold to a specified temperature which is at least equal to or higher than the melting temperature of the used resin; adjusting a lifting mechanism of the upper pressing roller to enable the upper pressing roller to descend, so that fibers form uniform waves between the upper pressing roller and the lower pressing roller; the larger the wave amplitude is, the larger the tension force applied to the fiber is, and the better the fiber infiltration effect is. However, excessive tension may cause fiber breakage. Therefore, the height of the waves needs to be adjusted according to the situation during implementation, and the balance between fiber infiltration and breakage is obtained;
thirdly, the extruder sends liquid resin into a molten pool transition section from the connecting flange, and then the resin enters cavities of the upper compression roller and the lower compression roller and overflows through a resin overflow hole on the surface of the compression roller;
starting a traction machine, continuously drawing the fibers, and fully soaking the fibers in contact with the resin on the surface of the compression roller;
step five, the fiber rod soaked with the resin is discharged from the mold and then enters a cooling water tank for cooling;
and step six, feeding the cooled fiber rod into a granulator, and cutting into master batches with the length of 5-25mm and the diameter of 2-3 mm.
In the process, the fiber is selected from one or more of inorganic or organic or metal fibers such as glass fiber, carbon fiber, aramid fiber, basalt fiber, high-density polyethylene fiber, polypropylene fiber, stainless steel fiber and the like, or mixed fiber comprising reinforcing fiber and resin fiber.
In the process, the resin can be thermoplastic resin such as polyethylene, polypropylene, high-density polyethylene, nylon, polyvinyl chloride, polycarbonate, polyethylene terephthalate, thermoplastic polyurethane, polyphenylene sulfide, polyether sulfone and the like.
In practice, the resin may be supplied using a twin screw extruder having a power of 10 to 40 kw.
The mold is heated by an electric heating pipe and an electric heating rod, and the temperature of the mold is set according to the melting temperature of the resin during operation. The temperature of the die can be controlled to be in the range of room temperature to 500 ℃ by adjusting the power of the heating pipe.
Example 3: the mold and the process provided by the application are utilized to prepare the glass fiber reinforced polypropylene composite material.
The heating temperature was set at 180 ℃. The mold provided in example 1 and the process provided in example 2 were used to prepare a composite material from glass fibers and polypropylene, and the preparation process was the same as the conventional preparation process of a composite material except for the impregnation process.
FIG. 10 is a scanning electron micrograph of the cross section of the masterbatch of glass fiber reinforced polypropylene composite material, wherein the round material is glass fiber and the gray portion is polypropylene resin. From the figure, it can be seen that the glass fibers are uniformly distributed in the resin matrix without agglomeration, indicating that the impregnation effect of the fibers is good.
The mechanical properties of the prepared glass fiber reinforced polypropylene composite material were tested, and the first mold and the second mold were named test 1 and test 2, respectively, and the results are shown in table 1. And compare with Nanjing polyron science and technology company Limited (comparative example 1) and the combined fertilizer can lead to the combined material of the same composition that new material company Limited (comparative example 2) produced, it is visible through the test, utilize the utility model provides a combined material mechanical properties of infiltration device preparation is superior to the combined fertilizer and leads to, and product property ability with Nanjing polyron is equivalent.
TABLE 1 mechanical Properties data of glass fiber reinforced Polypropylene composite (30 wt% glass fiber)
Example 4: the stainless steel fiber reinforced nylon 6 is prepared by utilizing the die and the process provided by the application.
The heating temperature was set at 280 ℃. The mold provided in example 1 and the process provided in example 2 were used to prepare a composite material from stainless steel fibers and nylon 6 as raw materials.
4.1 composite morphology: FIG. 11 is a scanning electron micrograph of the cross section of the masterbatch of stainless steel fiber reinforced nylon 6 composite material, in which the white circular areas are stainless steel fibers and the other areas are nylon 6 resin. It can be seen that the stainless steel fibers are very uniformly dispersed in the resin matrix.
4.3 resistivity measurement: the resistivity test results of the prepared stainless steel fiber reinforced nylon 6 composite material are shown in fig. 12.
It can be seen that the resistance of the composite material gradually decreased with the increase of the stainless steel fiber content, and reached 200 Ω cm at 10 wt% stainless steel fiber content.
4.4 electromagnetic shielding effectiveness measurement results: the electromagnetic shielding effectiveness test result of the prepared stainless steel fiber reinforced nylon 6 composite material is shown in fig. 13.
It can be seen that the electromagnetic shielding effectiveness is increasing with the increase of the stainless steel fiber content. The maximum electromagnetic shielding effectiveness reaches 50 dB.
Examples 3 and 4 the above two examples demonstrate that the mould provided by the present application is capable of achieving sufficient impregnation of the fibres with resin. The mechanical property of the prepared glass fiber reinforced polypropylene composite material reaches the domestic advanced level.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A long fiber reinforced thermoplastic composite material infiltration mold is characterized by comprising an upper compression roller and a fixing component thereof, a lower compression roller and a fixing component thereof, a mold shell, a lifting mechanism, a heating mechanism, a molten pool transition section and a connecting flange,
the mould shell comprises a mould side wall, a mould upper cover plate and a mould lower cover plate;
the upper compression roller and the lower compression roller are parallel to each other and arranged at intervals;
the lower pressing roller is a static pressure roller and is fixed on the side wall of the die through a fixing assembly;
the upper compression roller is a dynamic pressure roller, is connected with the lifting mechanism through a fixing assembly and rises and falls under the control of the lifting mechanism;
a yarn inlet hole and a yarn outlet hole for fibers to pass through are formed in the side wall of the die parallel to the directions of the upper pressing roller and the lower pressing roller;
a groove-shaped rail is arranged on the side wall of the die fixed by the lower pressing roller, and a fixing component of the upper pressing roller is matched with the groove-shaped rail, so that the upper pressing roller can slide up and down along the groove-shaped rail on the side wall of the die;
the upper pressing roller and the lower pressing roller comprise semi-cylindrical pressing rollers which are contacted with fibers and heating parts which are fixedly connected with the pressing rollers, semicircular partition plates are arranged on the arc-shaped surfaces of the pressing rollers at intervals, cavities for conveying resin are axially arranged in the pressing rollers of the upper pressing roller and the lower pressing roller, and resin overflow holes communicated with the cavities are formed between the partition plates;
one end of the molten pool transition section is fixedly communicated with the extruder through a connecting flange, the other end of the molten pool transition section is fixedly communicated with the side wall of the mold, a resin channel is arranged in the molten pool transition section, and resin supplied by the extruder flows into the molten pool transition section through the flange and is conveyed into axial cavities of the upper compression roller and the lower compression roller through the channel of the molten pool transition section.
2. The infiltration mold of long fiber reinforced thermoplastic composite material of claim 1, wherein the radius of the upper and lower pressing rolls in the infiltration mold is in the range of 2.5-5 cm, and the distance between the edges of the pressing rolls is 5-10 cm; in the soaking process, the upper pressing roller moves to be level with the lower pressing roller, the upper edges of the upper pressing roller and the lower pressing roller are taken as horizontal lines, and the movable upper pressing roller can move upwards and downwards within the range of 0-5 cm and 0-10 cm.
3. The infiltration mold of claim 2, wherein the heating mechanism comprises an electric heating tube and a lead wire of the electric heating tube disposed on the sidewall of the mold shell, an electric heating rod and a lead wire of the electric heating rod inserted into the upper cover plate and the lower cover plate of the mold, and an electric heater connected to the lead wire of the electric heating tube and the lead wire of the electric heating rod and located outside the mold;
the heating part of the press roller comprises a heating part shell, a lead laid in the heating part shell and an electric heater which is communicated through the lead and positioned outside the die.
4. The infiltration mold for long fiber reinforced thermoplastic composite material of claim 2, wherein the yarn inlet, the yarn outlet, the resin overflow hole of the upper pressing roll and the resin overflow hole of the lower pressing roll of the same fiber bundle are in the same vertical plane.
5. The infiltration mold for long fiber reinforced thermoplastic composite materials of claim 2, wherein rectangular grooves are axially arranged between the partition plates of the compression roller and are recessed towards the circular direction of the compression roller, the rectangular grooves are 2mm long and 6mm wide, the resin overflow holes are arranged at the bottoms of the rectangular grooves, and the resin overflow holes are circular holes with the diameter of 0.8-2 mm.
6. The infiltration mold for long fiber reinforced thermoplastic composite material of claim 2, further comprising a yarn feeding bracket disposed in the yarn feeding direction and a product bracket disposed in the yarn discharging direction outside the infiltration mold; the infiltration mold is fixedly arranged on the bracket, and the infiltration channel, the extruder and the connecting flange are kept on the same horizontal plane.
7. The infiltration mold for long fiber reinforced thermoplastic composite material of claim 2, wherein the lower cover plate is rotatably connected to the sidewall of the mold by a hinge, a fastening bolt is disposed on the opposite side of the hinge to tightly connect the lower cover plate to the sidewall of the mold, and the hinge and the fastening bolt are used to control the lower cover plate to open and close rapidly.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920889833.6U CN210082172U (en) | 2019-06-11 | 2019-06-11 | Long fiber reinforced thermoplastic composite material infiltration mold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920889833.6U CN210082172U (en) | 2019-06-11 | 2019-06-11 | Long fiber reinforced thermoplastic composite material infiltration mold |
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| CN210082172U true CN210082172U (en) | 2020-02-18 |
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| CN201920889833.6U Active CN210082172U (en) | 2019-06-11 | 2019-06-11 | Long fiber reinforced thermoplastic composite material infiltration mold |
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Effective date of registration: 20230905 Address after: No.3333 Longteng Road, high tech Zone, Tai'an City, Shandong Province 271000 Patentee after: Shandong Longteng New Material Co.,Ltd. Address before: 271000 building B11, Taishan science and Technology City, high tech Zone, Tai'an City, Shandong Province Patentee before: Shandong Dingyuan Zhiye New Materials Co.,Ltd. |