CN116813948A - Preparation process of unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin - Google Patents
Preparation process of unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin Download PDFInfo
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- CN116813948A CN116813948A CN202310873965.0A CN202310873965A CN116813948A CN 116813948 A CN116813948 A CN 116813948A CN 202310873965 A CN202310873965 A CN 202310873965A CN 116813948 A CN116813948 A CN 116813948A
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- fiber
- stirrer
- glass fiber
- prepreg tape
- modified glass
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- 229920005992 thermoplastic resin Polymers 0.000 title claims abstract description 39
- 239000011199 continuous fiber reinforced thermoplastic Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000003365 glass fiber Substances 0.000 claims abstract description 120
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims abstract description 44
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 28
- 229960003638 dopamine Drugs 0.000 claims abstract description 22
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 238000002791 soaking Methods 0.000 claims abstract description 11
- 238000001291 vacuum drying Methods 0.000 claims abstract description 10
- 238000005253 cladding Methods 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 109
- 230000005484 gravity Effects 0.000 claims description 54
- 239000002131 composite material Substances 0.000 claims description 47
- 238000005470 impregnation Methods 0.000 claims description 34
- 239000007788 liquid Substances 0.000 claims description 29
- 238000000967 suction filtration Methods 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 20
- 239000007853 buffer solution Substances 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000004804 winding Methods 0.000 claims description 12
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 10
- 239000004626 polylactic acid Substances 0.000 claims description 10
- 239000002243 precursor Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- HPTYUNKZVDYXLP-UHFFFAOYSA-N aluminum;trihydroxy(trihydroxysilyloxy)silane;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O[Si](O)(O)O HPTYUNKZVDYXLP-UHFFFAOYSA-N 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 229910052621 halloysite Inorganic materials 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000002071 nanotube Substances 0.000 claims description 8
- 238000003490 calendering Methods 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 7
- 238000009210 therapy by ultrasound Methods 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 5
- 239000000523 sample Substances 0.000 claims description 5
- 239000002918 waste heat Substances 0.000 claims description 5
- 239000006172 buffering agent Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical group OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000000872 buffer Substances 0.000 claims description 2
- 230000003139 buffering effect Effects 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000013329 compounding Methods 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract 1
- 239000012779 reinforcing material Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000007983 Tris buffer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003733 fiber-reinforced composite Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- Reinforced Plastic Materials (AREA)
Abstract
The invention provides a preparation process of a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin. A preparation process of a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin comprises the following steps: dissolving and adding hydrochloric acid to adjust pH; dopamine cladding modified glass fiber; suction filtering and vacuum drying; splitting and mixing basalt fibers; mixing, melting and soaking. According to the invention, the dopamine is used for coating and modifying the glass fiber, so that the glass fiber and the thermoplastic resin have better wettability and interface bonding performance, and the unidirectional prepreg tape prepared by compounding the glass fiber and the thermoplastic resin has excellent impact strength and flexibility.
Description
Technical Field
The invention relates to the technical field of fiber reinforced composite materials, in particular to a preparation process of a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin.
Background
The unidirectional prepreg tape is a unidirectional tape formed by impregnating unidirectional continuous fibers with a thermoplastic resin having properties of softening by heat and hardening by cooling, which can be maintained regardless of how many times heating and cooling are repeated, and in addition, it is widely used in the fields of plastic manufacturing materials and the like due to its characteristics of large damage tolerance, recyclability, and no environmental pollution, and therefore, the thermoplastic resin is a good raw material for preparing the unidirectional prepreg tape.
At present, a process for preparing a unidirectional prepreg tape by dipping glass fibers into molten thermoplastic resin is available, but the wettability and interfacial bonding property of the glass fibers and the thermoplastic resin are poor due to the high viscosity of the thermoplastic resin, thereby affecting the quality and performance of the prepared unidirectional prepreg tape.
Therefore, we propose a process for preparing unidirectional prepreg tapes of continuous fiber reinforced thermoplastic resins, which can improve the interfacial bonding properties of glass fibers and thermoplastic resins, to improve the quality and performance of unidirectional prepreg tapes.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a preparation process of a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin.
A preparation process of a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin comprises the following steps:
s1: dissolving and adding hydrochloric acid to adjust pH
Dissolving a buffering agent in deionized water, fully mixing, and then pumping hydrochloric acid until the pH value is 8-9 to obtain a buffering solution;
s2: dopamine coated modified glass fiber
Adding the glass into the buffer solution after drying treatment, carrying out ultrasonic treatment for 10-15min, adding dopamine, and carrying out coating reaction to obtain modified glass fiber;
s3: suction filtration and vacuum drying
Extracting the liquid through suction filtration, and then carrying out vacuum drying on the modified glass fiber until the water content of the modified glass fiber is 0-0.05%, thus obtaining the dried modified glass fiber;
s4: splitting and mixing basalt fiber
The dry modified glass fiber and the basalt fiber are respectively subjected to primary fiber opening, then the two fibers after fiber opening are overlapped and mixed to prepare composite fiber, and then the composite fiber is subjected to secondary fiber opening and winding;
s5: mixed melting and re-impregnating
Mixing halloysite nanotubes and polylactic acid resin, melting, pressing into an impregnation die, introducing the composite fibers into the impregnation die, calendaring, impregnating, cooling, shaping, and rolling to obtain the unidirectional prepreg tape with the continuous fiber reinforced thermoplastic resin.
Further, the dissolving and adding hydrochloric acid in the step S1 adjusts the pH, and specifically comprises the following steps:
s1.1: adding a buffering agent and deionized water into a stirrer together until a gravity sensor in the stirrer detects that the gravity in the stirrer is not increased any more, and sending a signal to a controller by the gravity sensor;
s1.2: after the controller receives the signal sent by the gravity sensor, the stirrer is controlled to stir for 25-30min at the speed of 200-300 r/min;
s1.3: then the controller controls the hydraulic pump to pump the hydrochloric acid into the stirrer, and meanwhile, the original speed stirring is kept until the pH value=8-9 is detected by the pH detector in the stirrer, so that a buffer solution is obtained, and meanwhile, the pH detector sends a signal to the sensor;
s1.4: and after receiving the signal sent by the pH detector, the controller controls the hydraulic pump to be closed, stops pumping hydrochloric acid, and simultaneously controls the stirrer to stop stirring.
Further, the dopamine-coated modified glass fiber of the step S2 specifically comprises the following steps:
s2.1: placing the glass fiber in a muffle furnace at 400-600 ℃ for drying treatment for 1-2h, and then adding the glass fiber into the buffer solution prepared in the step S1.3 until a gravity sensor in the stirrer detects that the gravity in the stirrer is not increased for the second time, and then the gravity sensor sends a signal to a controller for the second time;
s2.2: after the controller receives the signal sent by the gravity sensor for the second time, controlling the ultrasonic probe to be immersed in the mixed solution of the buffer solution and the glass fiber, and performing ultrasonic treatment for 10-15min to obtain glass fiber soaking solution;
s2.3, adding dopamine into the glass fiber soaking liquid until a gravity sensor in the stirrer detects that the gravity in the stirrer is not increased for the third time, and sending a signal to a controller by the gravity sensor for the third time;
s2.4: after the controller receives the signal sent by the gravity sensor for the third time, the autorotation device of the stirrer is controlled to start, the stirrer rotates for 18-25 hours at the speed of 5-10r/min, and the coating reaction is carried out, so that the modified glass fiber is obtained.
Further, the step S3 of suction filtration and vacuum drying specifically comprises the following steps:
s3.1: after the coating reaction is finished, the controller controls the suction filtration assembly in the stirrer to be started, liquid in the stirrer is pumped out through the suction filtration assembly, and the modified glass fiber prepared in the step S2.4 is left in the stirrer;
s3.2: until the liquid volume sensor in the stirrer detects that no liquid exists in the stirrer, the liquid volume sensor sends a signal to the controller;
s3.3: after receiving the signal sent by the liquid volume sensor, the controller controls the suction filtration assembly to be closed, and simultaneously controls the discharge assembly of the stirrer to be opened;
s3.4: putting the modified glass fiber into a closed vacuum box through a discharging assembly, and drying the modified glass fiber by placing the closed vacuum box in hot air after the modified glass fiber completely enters the closed vacuum box;
s3.5: and (3) until the solid moisture on-line measuring instrument of the closed vacuum box detects that the moisture content of the modified glass fiber is 0-0.05%, obtaining the dry modified glass fiber, and simultaneously, sending a signal to the controller by the solid moisture on-line measuring instrument.
Further, the step S4 of opening and mixing basalt fiber specifically comprises the following steps:
s4.1: after receiving a signal sent by the solid moisture on-line measuring instrument, the controller controls a discharge valve of the closed vacuum box to be opened;
s4.2: feeding the dried modified glass fiber prepared in the step S3.5 into a fiber opening machine through a discharge valve, and primarily opening the dried modified glass fiber in a first air flow fiber opening area of the fiber opening machine, and simultaneously feeding basalt fiber into the fiber opening machine, wherein the basalt fiber is synchronously primarily opened in a second air flow fiber opening area of the fiber opening machine;
s4.3: after primary fiber opening, overlapping and mixing the modified glass fiber and basalt fiber in a mixing area of a fiber opening machine to obtain composite fiber;
s4.4: and then the composite fiber enters a roller fiber opening area for secondary fiber opening, and after the secondary fiber opening is finished, the composite fiber is wound into a composite fiber roll through a winding drum of a fiber opening machine.
Further, the step S5 of mixed melting and re-dipping specifically comprises the following steps:
s5.1: adding halloysite nanotubes and polylactic acid resin into a high-speed mixer, and fully mixing for 5-10min to obtain a mixed material;
s5.2: adding the mixed materials into an extruder, heating and melting to obtain mixed melt, and extruding the mixed melt into an impregnation zone of an impregnation die from a die head of the impregnation die through a machine head of the extruder;
s5.3: the composite fiber prepared in the step S4.3 is led out from a composite fiber roll through a yarn guiding device on a winding drum, flattened and preheated, and then led into an impregnation die for calendaring impregnation, so that a precursor prepreg tape is obtained;
s5.4: cooling and shaping the impregnated precursor prepreg tape by a refrigeration box to obtain a solidified prepreg tape;
s5.5: and rolling the unidirectional prepreg tape by a rolling machine at the discharge port of the refrigeration box to obtain the unidirectional prepreg tape of the continuous fiber reinforced thermoplastic resin.
Further, after the glass fiber is taken out from the muffle furnace in the step S2.1, keeping the hot air in the muffle furnace to circulate with the external air, naturally cooling until a thermometer in the muffle furnace detects that the temperature in the muffle furnace is reduced to 200-250 ℃, closing the muffle furnace, preserving heat, and then placing the airtight vacuum box filled with the modified glass fiber in the step S3.4 into the muffle furnace, and heating the airtight vacuum box by waste heat in the muffle furnace to dry the modified glass fiber.
Further, the buffer is tris.
Compared with the prior art, the invention has the advantages that:
1. according to the invention, the dopamine is used for coating and modifying the glass fiber, so that the glass fiber and the thermoplastic resin have better wettability and interface bonding performance, and the unidirectional prepreg tape prepared by compounding the glass fiber and the thermoplastic resin has excellent impact strength and flexibility.
2. According to the invention, the halloysite nanotubes are added into the polylactic acid resin, and are mixed uniformly and then subjected to melt compounding, so that the crystallinity of the polylactic acid resin can be improved, and the heat resistance and the tensile strength of the polylactic acid resin are improved.
3. According to the invention, the basalt fiber is uniformly mixed into the modified glass fiber to prepare the composite fiber, and then the composite fiber is used as a reinforcing material for impregnation to prepare the unidirectional prepreg tape, so that the mechanical property and the high temperature resistance of the unidirectional prepreg tape are further improved.
4. According to the invention, volatile harmful substances are not generated in the process of modifying the glass fiber by the dopamine, so that the environment-friendly effect can be achieved.
Drawings
FIG. 1 is a flow chart of a process for preparing a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin used in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
A process for preparing a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin, as shown in fig. 1, comprising the steps of:
s1: dissolving and adding hydrochloric acid to adjust pH
Adding tris (hydroxymethyl) aminomethane and deionized water into a stirrer together until a gravity sensor in the stirrer detects that the gravity in the stirrer is not increased any more, sending a signal to a controller by the gravity sensor, controlling the stirrer to stir for 25min at the speed of 200r/min after receiving the signal sent by the gravity sensor by the controller, then controlling a hydraulic pump to pump hydrochloric acid into the stirrer by the controller, simultaneously keeping the original speed to stir until a pH (potential of hydrogen) detector in the stirrer detects pH=8, obtaining a buffer solution, simultaneously sending a signal to the sensor by the pH detector, controlling the hydraulic pump to be closed after receiving the signal sent by the pH detector, stopping pumping hydrochloric acid, and simultaneously controlling the stirrer to stop stirring;
s2: dopamine coated modified glass fiber
Placing glass fibers in a muffle furnace at 400 ℃ for drying treatment for 1h, then adding the glass fibers into the buffer solution prepared in the step S1, simultaneously, keeping hot air in the muffle furnace and outside air to circulate, naturally cooling until a thermometer in the muffle furnace detects that the temperature in the muffle furnace is reduced to 200 ℃, closing the muffle furnace for heat preservation, then when a gravity sensor in a stirrer detects that the gravity in the stirrer is not increased any more for the second time, sending a signal to the controller for the second time, controlling an ultrasonic probe to penetrate into a mixed solution of the buffer solution and the glass fibers after the controller receives the signal sent by the gravity sensor for the second time, performing ultrasonic treatment for 10min to obtain a glass fiber soaking solution, adding dopamine into the glass fiber soaking solution until the gravity sensor in the stirrer detects that the gravity in the stirrer is not increased any more for the third time, controlling a autorotation device of the stirrer to start up, and performing a cladding reaction at a speed of 5r/min for 18h, so that the dopamine is modified, and the glass fibers can not be subjected to thermal-plastic deformation, and the glass fiber has good thermal-mechanical properties, and the thermal-mechanical properties;
s3: suction filtration and vacuum drying
After the coating reaction is finished, the controller controls the suction filtration assembly in the stirrer to be started, liquid in the stirrer is pumped out through the suction filtration assembly, the modified glass fiber prepared in the step S2 is left in the stirrer until the liquid volume sensor in the stirrer detects that no liquid exists in the stirrer, the liquid volume sensor sends a signal to the controller, the controller controls the suction filtration assembly to be closed after receiving the signal sent by the liquid volume sensor, meanwhile controls the discharging assembly of the stirrer to be opened, the modified glass fiber is put into the closed vacuum box through the discharging assembly, the closed vacuum box is placed into the muffle furnace after all the modified glass fiber enters the closed vacuum box, and the closed vacuum box is heated through waste heat in the muffle furnace to dry the modified glass fiber until the solid moisture on-line measuring instrument of the closed vacuum box detects that the moisture content of the modified glass fiber is 0.01%, so that the dry modified glass fiber is obtained, and meanwhile, the solid moisture on-line measuring instrument sends a signal to the controller;
s4: splitting and mixing basalt fiber
After receiving a signal sent by the solid water content online measuring instrument, a controller controls a discharge valve of a closed vacuum box to be opened, the dry modified glass fiber prepared in the step S3 is fed into a fiber opener through the discharge valve, the dry modified glass fiber is primarily opened in a first airflow fiber opening area of the fiber opener, meanwhile basalt fiber is fed into the fiber opener, the basalt fiber is synchronously primarily opened in a second airflow fiber opening area of the fiber opener, after the primary opening, the modified glass fiber and the basalt fiber are overlapped and mixed in a mixing area of the fiber opener to obtain composite fiber, then the composite fiber enters a roller fiber opening area to be secondarily opened, after the secondary opening is completed, the composite fiber is wound into a composite fiber roll through a winding drum of the fiber opener, the composite fiber is prepared by uniformly mixing the basalt fiber into the modified glass fiber, and then the composite fiber is used as a reinforcing material for impregnation, so that a unidirectional prepreg tape is prepared, and the mechanical property and the high temperature resistance of the unidirectional prepreg tape are further improved;
s5: mixed melting and re-impregnating
Adding halloysite nanotubes and polylactic acid resin into a high-speed mixer together, fully mixing for 5min to obtain a mixed material, adding the mixed material into an extruder, heating and melting to obtain a mixed melt, extruding the mixed melt into an impregnation zone of an impregnation die from a die head of the impregnation die through a head of the extruder, leading out, flattening and preheating the composite fiber prepared in the step S4 from a composite fiber roll through a yarn guiding device on a winding drum, then introducing the composite fiber into the impregnation die for calendaring and impregnating to obtain a precursor prepreg tape, cooling and shaping the precursor prepreg tape after impregnation by a cooling box to obtain a cured prepreg tape, and finally rolling the unidirectional prepreg tape by a rolling machine at a discharge port of the cooling box to obtain the unidirectional prepreg tape of the continuous fiber reinforced thermoplastic resin.
Example 2
A process for preparing a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin, as shown in fig. 1, comprising the steps of:
s1: dissolving and adding hydrochloric acid to adjust pH
Adding tris (hydroxymethyl) aminomethane and deionized water into a stirrer together until a gravity sensor in the stirrer detects that the gravity in the stirrer is not increased any more, sending a signal to a controller by the gravity sensor, controlling the stirrer to stir for 25min at the speed of 300r/min after receiving the signal sent by the gravity sensor by the controller, then controlling a hydraulic pump to pump hydrochloric acid into the stirrer by the controller, simultaneously keeping the original speed to stir until a pH (potential of hydrogen) detector in the stirrer detects pH=8, obtaining a buffer solution, simultaneously sending a signal to the sensor by the pH detector, controlling the hydraulic pump to be closed after receiving the signal sent by the pH detector, stopping pumping hydrochloric acid, and simultaneously controlling the stirrer to stop stirring;
s2: dopamine coated modified glass fiber
Placing glass fibers in a muffle furnace at 600 ℃ for drying treatment for 1h, then adding the glass fibers into the buffer solution prepared in the step S1, simultaneously, keeping hot air in the muffle furnace and outside air to circulate, naturally cooling until a thermometer in the muffle furnace detects that the temperature in the muffle furnace is reduced to 200 ℃, closing the muffle furnace for heat preservation, then when a gravity sensor in a stirrer detects that the gravity in the stirrer is not increased any more for the second time, sending a signal to the controller for the second time, controlling an ultrasonic probe to penetrate into a mixed solution of the buffer solution and the glass fibers after the controller receives the signal sent by the gravity sensor for the second time, performing ultrasonic treatment for 10min to obtain a glass fiber soaking solution, adding dopamine into the glass fiber soaking solution until the gravity sensor in the stirrer detects that the gravity in the stirrer is not increased any more for the third time, controlling a autorotation device of the stirrer to start up for the third time, and performing a cladding reaction at a speed of 10r/min for 18h, so that the dopamine is modified, and the glass fibers can not be modified by using the modified glass fibers, and the glass fiber has good thermal-mechanical strength, and the glass fiber has good thermal-insulation performance, and the thermal-plastic performance;
s3: suction filtration and vacuum drying
After the coating reaction is finished, the controller controls the suction filtration assembly in the stirrer to be started, liquid in the stirrer is pumped out through the suction filtration assembly, the modified glass fiber prepared in the step S2 is left in the stirrer until the liquid volume sensor in the stirrer detects that no liquid exists in the stirrer, the liquid volume sensor sends a signal to the controller, the controller controls the suction filtration assembly to be closed after receiving the signal sent by the liquid volume sensor, meanwhile controls the discharging assembly of the stirrer to be opened, the modified glass fiber is put into the closed vacuum box through the discharging assembly, the closed vacuum box is placed into the muffle furnace after all the modified glass fiber enters the closed vacuum box, and the closed vacuum box is heated through waste heat in the muffle furnace to dry the modified glass fiber until the solid moisture on-line measuring instrument of the closed vacuum box detects that the moisture content of the modified glass fiber is 0.02%, so that the dry modified glass fiber is obtained, and meanwhile, the solid moisture on-line measuring instrument sends a signal to the controller;
s4: splitting and mixing basalt fiber
After receiving a signal sent by the solid water content online measuring instrument, a controller controls a discharge valve of a closed vacuum box to be opened, the dry modified glass fiber prepared in the step S3 is fed into a fiber opener through the discharge valve, the dry modified glass fiber is primarily opened in a first airflow fiber opening area of the fiber opener, meanwhile basalt fiber is fed into the fiber opener, the basalt fiber is synchronously primarily opened in a second airflow fiber opening area of the fiber opener, after the primary opening, the modified glass fiber and the basalt fiber are overlapped and mixed in a mixing area of the fiber opener to obtain composite fiber, then the composite fiber enters a roller fiber opening area to be secondarily opened, after the secondary opening is completed, the composite fiber is wound into a composite fiber roll through a winding drum of the fiber opener, the composite fiber is prepared by uniformly mixing the basalt fiber into the modified glass fiber, and then the composite fiber is used as a reinforcing material for impregnation, so that a unidirectional prepreg tape is prepared, and the mechanical property and the high temperature resistance of the unidirectional prepreg tape are further improved;
s5: mixed melting and re-impregnating
Adding halloysite nanotubes and polylactic acid resin into a high-speed mixer together, fully mixing for 5min to obtain a mixed material, adding the mixed material into an extruder, heating and melting to obtain a mixed melt, extruding the mixed melt into an impregnation zone of an impregnation die from a die head of the impregnation die through a head of the extruder, leading out, flattening and preheating the composite fiber prepared in the step S4 from a composite fiber roll through a yarn guiding device on a winding drum, then introducing the composite fiber into the impregnation die for calendaring and impregnating to obtain a precursor prepreg tape, cooling and shaping the precursor prepreg tape after impregnation by a cooling box to obtain a cured prepreg tape, and finally rolling the unidirectional prepreg tape by a rolling machine at a discharge port of the cooling box to obtain the unidirectional prepreg tape of the continuous fiber reinforced thermoplastic resin.
Example 3
A process for preparing a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin, as shown in fig. 1, comprising the steps of:
s1: dissolving and adding hydrochloric acid to adjust pH
Adding tris (hydroxymethyl) aminomethane and deionized water into a stirrer together until a gravity sensor in the stirrer detects that the gravity in the stirrer is not increased any more, sending a signal to a controller by the gravity sensor, controlling the stirrer to stir for 25min at the speed of 200r/min after receiving the signal sent by the gravity sensor by the controller, then controlling a hydraulic pump to pump hydrochloric acid into the stirrer by the controller, simultaneously keeping the original speed to stir until a pH (potential of hydrogen) detector in the stirrer detects pH=9, obtaining a buffer solution, simultaneously sending a signal to the sensor by the pH detector, controlling the hydraulic pump to be closed after receiving the signal sent by the pH detector, stopping pumping hydrochloric acid, and simultaneously controlling the stirrer to stop stirring;
s2: dopamine coated modified glass fiber
Placing glass fiber in a muffle furnace at 400 ℃ for drying treatment for 2 hours, adding the glass fiber into the buffer solution prepared in the step S1, simultaneously, keeping hot air in the muffle furnace to circulate with external air, naturally cooling until a thermometer in the muffle furnace detects that the temperature in the muffle furnace is reduced to 250 ℃, closing the muffle furnace, carrying out heat preservation, then when a gravity sensor in a stirrer detects that the gravity in the stirrer is not increased any more for the second time, sending a signal to a controller by the gravity sensor for the second time, controlling an ultrasonic probe to be immersed into a mixed solution of the buffer solution and the glass fiber after the signal sent by the gravity sensor is received by the controller for the second time, carrying out ultrasonic treatment for 10 minutes to obtain a glass fiber soaking solution, adding dopamine into the glass fiber soaking solution, after the gravity sensor in the stirrer detects that the gravity in the stirrer is not increased for the third time, the gravity sensor sends a signal to the controller for the third time, the controller controls the autorotation device of the stirrer to start after receiving the signal sent by the gravity sensor for the third time, the stirrer rotates for 25 hours at the speed of 5r/min to perform coating reaction, modified glass fibers are obtained, and the glass fibers and the thermoplastic resin can have better wettability and interface bonding performance by using dopamine to perform coating modification on the glass fibers, so that the unidirectional prepreg tape prepared by compounding the glass fibers and the thermoplastic resin has excellent impact strength and flexibility, and in addition, volatile harmful substances cannot be generated in the process of modifying the glass fibers by using dopamine, so that the effect of green and environment protection can be achieved;
s3: suction filtration and vacuum drying
After the coating reaction is finished, the controller controls the suction filtration assembly in the stirrer to be started, liquid in the stirrer is pumped out through the suction filtration assembly, the modified glass fiber prepared in the step S2 is left in the stirrer until the liquid volume sensor in the stirrer detects that no liquid exists in the stirrer, the liquid volume sensor sends a signal to the controller, the controller controls the suction filtration assembly to be closed after receiving the signal sent by the liquid volume sensor, meanwhile controls the discharging assembly of the stirrer to be opened, the modified glass fiber is put into the closed vacuum box through the discharging assembly, the closed vacuum box is placed into the muffle furnace after all the modified glass fiber enters the closed vacuum box, and the closed vacuum box is heated through waste heat in the muffle furnace to dry the modified glass fiber until the solid moisture on-line measuring instrument of the closed vacuum box detects that the moisture content of the modified glass fiber is 0.05%, so that the dry modified glass fiber is obtained, and meanwhile, the solid moisture on-line measuring instrument sends a signal to the controller;
s4: splitting and mixing basalt fiber
After receiving a signal sent by the solid water content online measuring instrument, a controller controls a discharge valve of a closed vacuum box to be opened, the dry modified glass fiber prepared in the step S3 is fed into a fiber opener through the discharge valve, the dry modified glass fiber is primarily opened in a first airflow fiber opening area of the fiber opener, meanwhile basalt fiber is fed into the fiber opener, the basalt fiber is synchronously primarily opened in a second airflow fiber opening area of the fiber opener, after the primary opening, the modified glass fiber and the basalt fiber are overlapped and mixed in a mixing area of the fiber opener to obtain composite fiber, then the composite fiber enters a roller fiber opening area to be secondarily opened, after the secondary opening is completed, the composite fiber is wound into a composite fiber roll through a winding drum of the fiber opener, the composite fiber is prepared by uniformly mixing the basalt fiber into the modified glass fiber, and then the composite fiber is used as a reinforcing material for impregnation, so that a unidirectional prepreg tape is prepared, and the mechanical property and the high temperature resistance of the unidirectional prepreg tape are further improved;
s5: mixed melting and re-impregnating
Adding halloysite nanotubes and polylactic acid resin into a high-speed mixer together, fully mixing for 10min to obtain a mixed material, adding the mixed material into an extruder, heating and melting to obtain a mixed melt, extruding the mixed melt into an impregnation zone of an impregnation die from a die head of the impregnation die through a head of the extruder, leading out, flattening and preheating the composite fiber prepared in the step S4 from a composite fiber roll through a yarn guiding device on a winding drum, then introducing the composite fiber into the impregnation die for calendaring and impregnating to obtain a precursor prepreg tape, cooling and shaping the precursor prepreg tape after impregnation by a cooling box to obtain a cured prepreg tape, and finally rolling the unidirectional prepreg tape by a rolling machine at a discharge port of the cooling box to obtain the unidirectional prepreg tape of the continuous fiber reinforced thermoplastic resin.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (8)
1. A process for preparing a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin, comprising the steps of:
s1: dissolving and adding hydrochloric acid to adjust pH
Dissolving a buffering agent in deionized water, fully mixing, and then pumping hydrochloric acid until the pH value is 8-9 to obtain a buffering solution;
s2: dopamine coated modified glass fiber
Adding the glass into the buffer solution after drying treatment, carrying out ultrasonic treatment for 10-15min, adding dopamine, and carrying out coating reaction to obtain modified glass fiber;
s3: suction filtration and vacuum drying
Extracting the liquid through suction filtration, and then carrying out vacuum drying on the modified glass fiber until the water content of the modified glass fiber is 0-0.05%, thus obtaining the dried modified glass fiber;
s4: splitting and mixing basalt fiber
The dry modified glass fiber and the basalt fiber are respectively subjected to primary fiber opening, then the two fibers after fiber opening are overlapped and mixed to prepare composite fiber, and then the composite fiber is subjected to secondary fiber opening and winding;
s5: mixed melting and re-impregnating
Mixing halloysite nanotubes and polylactic acid resin, melting, pressing into an impregnation die, introducing the composite fibers into the impregnation die, calendaring, impregnating, cooling, shaping, and rolling to obtain the unidirectional prepreg tape with the continuous fiber reinforced thermoplastic resin.
2. The process for preparing a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin according to claim 1, wherein the dissolving and adding hydrochloric acid in step S1 adjusts the pH, specifically comprising the steps of:
s1.1: adding a buffering agent and deionized water into a stirrer together until a gravity sensor in the stirrer detects that the gravity in the stirrer is not increased any more, and sending a signal to a controller by the gravity sensor;
s1.2: after the controller receives the signal sent by the gravity sensor, the stirrer is controlled to stir for 25-30min at the speed of 200-300 r/min;
s1.3: then the controller controls the hydraulic pump to pump the hydrochloric acid into the stirrer, and meanwhile, the original speed stirring is kept until the pH value=8-9 is detected by the pH detector in the stirrer, so that a buffer solution is obtained, and meanwhile, the pH detector sends a signal to the sensor;
s1.4: and after receiving the signal sent by the pH detector, the controller controls the hydraulic pump to be closed, stops pumping hydrochloric acid, and simultaneously controls the stirrer to stop stirring.
3. The process for preparing a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin according to claim 2, wherein the dopamine cladding modified glass fiber of step S2 comprises the following steps:
s2.1: drying the glass fiber in a muffle furnace at 400-600deg.C for 1-2h, and adding
S1.3, in the prepared buffer solution, after a gravity sensor in the stirrer detects that the gravity in the stirrer is not increased for the second time, the gravity sensor sends a signal to a controller for the second time;
s2.2: after the controller receives the signal sent by the gravity sensor for the second time, controlling the ultrasonic probe to be immersed in the mixed solution of the buffer solution and the glass fiber, and performing ultrasonic treatment for 10-15min to obtain glass fiber soaking solution; s2.3, adding dopamine into the glass fiber soaking liquid until a gravity sensor in the stirrer detects that the gravity in the stirrer is not increased for the third time, and sending a signal to a controller by the gravity sensor for the third time;
s2.4: after the controller receives the signal sent by the gravity sensor for the third time, the autorotation device of the stirrer is controlled to start, the stirrer rotates for 18-25 hours at the speed of 5-10r/min, and the coating reaction is carried out, so that the modified glass fiber is obtained.
4. A process for preparing a unidirectional prepreg tape of a continuous fiber reinforced thermoplastic resin as claimed in claim 3, wherein the step S3 of suction filtration and vacuum drying comprises the steps of:
s3.1: after the coating reaction is finished, the controller controls the suction filtration assembly in the stirrer to be started, liquid in the stirrer is pumped out through the suction filtration assembly, and the modified glass fiber prepared in the step S2.4 is left in the stirrer;
s3.2: until the liquid volume sensor in the stirrer detects that no liquid exists in the stirrer, the liquid volume sensor sends a signal to the controller;
s3.3: after receiving the signal sent by the liquid volume sensor, the controller controls the suction filtration assembly to be closed, and simultaneously controls the discharge assembly of the stirrer to be opened;
s3.4: putting the modified glass fiber into a closed vacuum box through a discharging assembly, and drying the modified glass fiber by placing the closed vacuum box in hot air after the modified glass fiber completely enters the closed vacuum box;
s3.5: and (3) until the solid moisture on-line measuring instrument of the closed vacuum box detects that the moisture content of the modified glass fiber is 0-0.05%, obtaining the dry modified glass fiber, and simultaneously, sending a signal to the controller by the solid moisture on-line measuring instrument.
5. The process for preparing a unidirectional prepreg tape of a thermoplastic resin reinforced with continuous fibers as claimed in claim 4, wherein the step S4 of opening the fibers and mixing basalt fibers comprises the steps of:
s4.1: after receiving a signal sent by the solid moisture on-line measuring instrument, the controller controls a discharge valve of the closed vacuum box to be opened;
s4.2: feeding the dried modified glass fiber prepared in the step S3.5 into a fiber opening machine through a discharge valve, and primarily opening the dried modified glass fiber in a first air flow fiber opening area of the fiber opening machine, and simultaneously feeding basalt fiber into the fiber opening machine, wherein the basalt fiber is synchronously primarily opened in a second air flow fiber opening area of the fiber opening machine;
s4.3: after primary fiber opening, overlapping and mixing the modified glass fiber and basalt fiber in a mixing area of a fiber opening machine to obtain composite fiber;
s4.4: and then the composite fiber enters a roller fiber opening area for secondary fiber opening, and after the secondary fiber opening is finished, the composite fiber is wound into a composite fiber roll through a winding drum of a fiber opening machine.
6. The process for preparing a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin according to claim 5, wherein the mixed melt re-impregnation of step S5 comprises the steps of:
s5.1: adding halloysite nanotubes and polylactic acid resin into a high-speed mixer, and fully mixing for 5-10min to obtain a mixed material;
s5.2: adding the mixed materials into an extruder, heating and melting to obtain mixed melt, and extruding the mixed melt into an impregnation zone of an impregnation die from a die head of the impregnation die through a machine head of the extruder;
s5.3: the composite fiber prepared in the step S4.3 is led out from a composite fiber roll through a yarn guiding device on a winding drum, flattened and preheated, and then led into an impregnation die for calendaring impregnation, so that a precursor prepreg tape is obtained; s5.4: cooling and shaping the impregnated precursor prepreg tape by a refrigeration box to obtain a solidified prepreg tape; s5.5: and rolling the unidirectional prepreg tape by a rolling machine at the discharge port of the refrigeration box to obtain the unidirectional prepreg tape of the continuous fiber reinforced thermoplastic resin.
7. The process for preparing a unidirectional prepreg tape with continuous fiber reinforced thermoplastic resin according to claim 4, wherein after the glass fiber is taken out from the muffle furnace in step S2.1, keeping hot air in the muffle furnace to circulate with external air for natural cooling until a thermometer in the muffle furnace detects that the temperature in the muffle furnace is reduced to 200-250 ℃, closing the muffle furnace for heat preservation, and then placing the closed vacuum box filled with the modified glass fiber in step S3.4 into the muffle furnace for heating the closed vacuum box by waste heat in the muffle furnace to dry the modified glass fiber.
8. A process for the preparation of unidirectional prepreg tape of continuous fiber reinforced thermoplastic resin as claimed in claim 2 wherein the buffer is tris (hydroxymethyl) aminomethane.
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