CN110894357B

CN110894357B - Regenerated carbon fiber reinforced PA66 material based on ultrasonic technology and preparation method thereof

Info

Publication number: CN110894357B
Application number: CN201911166401.3A
Authority: CN
Inventors: 杨斌; 翁亚楠; 李鑫; 倪静娴
Original assignee: Nantong Fuyuan New Mstar Technology Ltd
Current assignee: Nantong Fuyuan New Mstar Technology Ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2022-04-15
Anticipated expiration: 2039-11-25
Also published as: CN110894357A

Abstract

The invention discloses a regenerated carbon fiber reinforced PA66 material based on ultrasonic technology and a preparation method thereof, wherein the preparation method comprises the following steps: the regenerated carbon fiber master batch is prepared from regenerated carbon fibers, an adhesive, an active assistant and a dispersing agent; the premix is prepared from PA66 resin, a graft and an antioxidant; and extruding and granulating the regenerated carbon fiber master batch and the premix. The preparation method based on the ultrasonic technology solves the blanking problem of RCF during extrusion granulation; the RCF reinforced PA66 material prepared by the preparation method of the invention keeps more than 92% of the performance of the CFRP material, and the qualified regenerated carbon fiber reinforced material can be regarded as if the performance of the RCF reinforced PA66 material is kept more than 85% in the industry; the invention makes it possible to produce CFRP composite material by extruding and granulating RCF and thermoplastic resin, and widens the application of RCF.

Description

Regenerated carbon fiber reinforced PA66 material based on ultrasonic technology and preparation method thereof

Technical Field

The invention relates to a regenerated composite material, in particular to a regenerated carbon fiber reinforced PA66 material based on an ultrasonic technology and a preparation method thereof.

Background

In recent years, Carbon Fiber Reinforced Plastics (CFRP) have been widely used in the fields of aerospace, wind turbine blades, sports and leisure, automobiles, pressure vessels, and the like, due to their characteristics of low density, high strength and modulus, corrosion resistance, and weather resistance. The carbon fiber reinforced material member can generate 30% -50% of leftover materials in production, meanwhile, a large number of CFRP members can be scrapped due to the fact that the CFRP members reach the service life along with the development of time, CFRP waste is more and more, and a large amount of resource waste is caused. Meanwhile, the waste is extremely difficult to decompose due to the extremely high corrosion resistance and weather resistance of the carbon fiber, and causes great pollution to the natural environment. At home and abroad, the recovery of carbon fibers from CFRP wastes through technologies such as thermal cracking, microwave and chemical dissolution has been studied and industrialized. However, the Regenerated Carbon Fibers (RCFs) are relatively bulky, have a low bulk density, are entangled with each other, and cannot be normally and stably fed when an extruder and resin regrind to produce a regenerated carbon fiber reinforced composite material, thereby limiting the application of RCFs.

Disclosure of Invention

In one aspect, the present disclosure relates to a method for preparing a recycled carbon fiber reinforced PA66 material based on ultrasonic technology, comprising:

the regenerated carbon fiber master batch is prepared from regenerated carbon fibers, an adhesive, an active assistant and a dispersing agent;

the premix is prepared from PA66 resin, a graft and an antioxidant; and

and extruding and granulating the regenerated carbon fiber master batch and the premix.

In another aspect, the present disclosure relates to a recycled carbon fiber reinforced PA66 material prepared based on one of the above-described methods for preparing a recycled carbon fiber reinforced PA66 material based on ultrasonic technology.

Detailed description of the invention

In the following description, certain specific details are included to provide a thorough understanding of various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth.

Unless otherwise required by the disclosure, throughout the specification and the appended claims, the words "comprise", "comprising", and "have" are to be construed in an open, inclusive sense, i.e., "including but not limited to".

Reference throughout the specification to "one embodiment," "an embodiment," "in another embodiment," or "in certain embodiments" means that a particular reference element, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" or "in another embodiment" or "in certain embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment, and furthermore, particular elements, structures, or features may be combined in any suitable manner in one or more embodiments.

Definition of

In the present disclosure, the term "PA 66 resin" is one of the polyamide resins, a crystalline polymer resulting from the polycondensation of adipic acid and hexamethylenediamine.

In the present disclosure, the term "adhesive" refers to a substance having adhesive properties by which two separate materials are joined together.

In the present disclosure, the term "auxiliary agent" refers to compounds that must be added to a polymer (synthetic resin) for the purpose of improving its processability or for the purpose of improving the properties of the resin itself, which are insufficient in molding processing.

In the present disclosure, the term "graft" refers to the reaction product of a polymer chain with appropriate branches or functional side groups bonded by chemical bonds.

In the present disclosure, the term "POE-g-MAH" refers to polyolefin elastomer grafted maleic anhydride, a commonly used toughening modifier in engineering plastics.

In the present disclosure, the term "EPDM-g-MAH" refers to maleic anhydride grafted ethylene propylene diene rubber, having the high elastic modulus of rubber.

In the present disclosure, the term "SEBS-g-MAH" refers to a maleic anhydride-grafted SEBS prepared by graft-modifying SEBS as a base.

In the present disclosure, the term "antioxidant" is referred to as "antioxidant" which, when present in only small amounts in a polymer system, retards or inhibits the progress of the polymer oxidation process, thereby preventing the aging of the polymer and extending its useful life.

Detailed Description

the premix is prepared from PA66 resin, a graft and an antioxidant; and

The adhesive, the active assistant and the dispersant are all water-based and can be pretreated on the surface of the RCF, and all the water-based and active groups are carried in the water-based and active assistant and dispersant, so that the binding capacity of the RCF and resin is improved, and meanwhile, the graft has chemical compatibilization effect on PA66 and the RCF, so that the RCF reinforced PA66 material retains good mechanical properties.

In certain embodiments, wherein the regenerated carbon fiber masterbatch is made from, by weight, 10.0 to 30.0 parts of regenerated carbon fibers, 0.5 to 2.5 parts of a binder, 4.0 to 12.0 parts of a coagent, and 0.5 to 1.5 parts of a dispersant.

In certain embodiments, wherein the premix is made from 45.4 to 81.8 parts by weight of PA66 resin, 3.0 to 8.0 parts by weight of graft, and 0.2 to 0.6 parts by weight of antioxidant.

In certain embodiments, the regenerated carbon fibers are made from recycled carbon fiber reinforcement by a pyrolysis process, a microwave process, or a dissolution process.

In certain embodiments, the recycled carbon fibers are selected from recycled carbon fiber reinforcement member finished products, recycled carbon fiber reinforcement member semi-finished products, or recycled carbon fiber reinforcement member scrap.

In certain embodiments, the regenerated carbon fibers are selected from Nantong Compound New Material technology, Inc. under the model FUY-CP.

In certain embodiments, the regenerated carbon fibers are cut to a length of 0.5 to 3.0 cm.

In certain embodiments, the binder is selected from ethylene vinyl acetate copolymers, ethylene acrylic acid copolymers, aminoalkyl-functionalized polydimethylsiloxane, or mixtures thereof.

In certain embodiments, the binder is a water soluble binder.

In certain embodiments, the adhesive is selected from alkyltrialkoxysilanes available from degussa, inc, under the type MTMS.

Wherein, through the flocculation and aggregation of the adhesive, the fluffy RCF is changed into the non-uniform fiber shape, and the bulk density of the RCF is increased; pretreatment with water-soluble adjuvants further increases the bulk density of the RCF.

In certain embodiments, the coagent is selected from ionic ethylene copolymers.

In certain embodiments, the coagent is selected from water-soluble Surlyn resin from dupont under the model Surlyn 9945B.

The surlyn resin is an ethylene- (methyl) acrylic acid zinc salt, sodium salt and other ionic bond polymer polymerized by a unique process of DuPont company, the ethylene copolymer has great activity compatible with polar resin such as nylon and the like due to the nature of the ethylene copolymer, and the ionic bond can be thermally attached to inorganic substances such as metal, glass, natural fiber and the like due to the existence of the ionic bond; the water-soluble surlyn resin is insoluble in water at normal temperature, but can be quickly dissolved when the water temperature reaches above 90 ℃ and can keep stable emulsion for a long time; the coagent capable of forming a stable emulsion can just pretreat the RCF with the water soluble binder, dispersant.

In certain embodiments, the dispersing agent is selected from polyethylene wax, polypropylene wax, polysilica wax, polypropylene-polymeric silica copolymer wax, silicone glycol copolymer wax, or mixtures thereof.

In certain embodiments, the dispersant is a water soluble wax.

In certain embodiments, the dispersant is selected from the polypropylene-polymeric silica copolymer waxes available from Keim-Additec, Germany, as model number E-680.

In certain embodiments, a binder, a dispersant, and deionized water are mixed to provide a first mixture;

mixing a co-agent with the first mixture to obtain a second mixture;

mixing the regenerated carbon fibers with the second mixture to obtain a third mixture; and

and (3) performing ultrasonic granulation on the third mixture, preferably using an ultrasonic vibration sieve, so as to obtain the regenerated carbon fiber master batch.

The ultrasonic vibration sieve converts electric energy into high-frequency sinusoidal vibration waves through an ultrasonic generator, and RCFs in the ultrasonic vibration sieve are subjected to acceleration to suspend; simultaneously, the RCFs which are mutually wound together are vibrated and dispersed under the action of ultrasonic cavitation; the broken linear RCF is curled under the action of the vibration wave, and at the moment, if the RCF is treated by the adhesive, the length of the RCF is proper, and under the action of the flocculation aggregates of the adhesive, the RCF can be agglomerated and is not in a fluffy state any more; in a continuous ultrasonic vibration environment, RCFs agglomerated with the adhesive are broken up quickly under the vibration action of ultrasonic waves even if the RCFs are agglomerated into large blocks; by controlling the shape and size of the screen of the ultrasonic vibration screen, the RCF master batch which is easy to feed in the extruder can be obtained, and the problem of feeding of RCF during extrusion granulation is solved.

In certain embodiments, the weight ratio of the first mixture to deionized water is from 4:4 to 4: 1.

In certain embodiments, the weight ratio of the first mixture to deionized water is 4: 3.

In certain embodiments, the mixing time of the second mixture is from 1 to 10 min.

In certain embodiments, the mixing time of the second mixture is from 1 to 3 min.

In certain embodiments, the mixing temperature of the second mixture is from 90 to 110 ℃.

In certain embodiments, the mixing temperature of the second mixture is 95 ℃.

In certain embodiments, the third mixture is also dried.

In certain embodiments, the drying temperature is from 50 to 150 ℃.

In certain embodiments, the drying temperature is from 80 to 120 ℃.

In certain embodiments, the drying temperature is 100 ℃.

In certain embodiments, the drying time is from 1 to 10 hours.

In certain embodiments, the drying time is from 3 to 4 hours.

In certain embodiments, the vibration frequency of the ultrasonic granulation is 20 to 50 KHz.

In certain embodiments, the vibration frequency of ultrasonic granulation is from 32 to 36 KHz.

In certain embodiments, the shaking time for ultrasonic granulation is from 2 to 30 min.

In certain embodiments, the shaking time for ultrasonic granulation is 5 to 10 min.

In certain embodiments, the ultrasonic vibratory screen has a screen mesh size of 1 to 10 mm.

In certain embodiments, the ultrasonic vibratory screen has a screen mesh size of 2 to 5 mm.

In certain embodiments, the PA66 resin has a relative viscosity of 1.0 to 5.0PA · S.

In certain embodiments, the PA66 resin has a relative viscosity of 2.1 to 3.5PA · S.

In certain embodiments, the PA66 resin is selected from the mare company under the model EPR 27.

In certain embodiments, the grafts are selected from POE-g-MAH, EPDM-g-MAH, SEBS-g-MAH, or mixtures thereof.

In certain embodiments, the graft is selected from SEBS-g-MAH.

In certain embodiments, the graft ratio of the graft is 1.4% to 2.0%.

In certain embodiments, the graft is selected from kraton, usa under model number FG 1901.

In certain embodiments, the antioxidant is selected from hindered phenolic antioxidants, phosphite antioxidants, or mixtures thereof.

In certain embodiments, the antioxidant is selected from the group consisting of antioxidants available from cyanogens industries, USA, under the types 1076 and 168.

In certain embodiments, the PA66 resin, the graft, and the antioxidant are mixed in a mixing kettle to provide a premix.

In certain embodiments, the speed of the mixing kettle is 600 to 1500 rpm.

In certain embodiments, the speed of the mixing kettle is from 750 to 1000 rpm.

In certain embodiments, the speed of the mixing kettle is 850 rpm.

In certain embodiments, the mixing time is from 1 to 8 min.

In certain embodiments, the mixing time is from 2 to 5 min.

In certain embodiments, the mixing time is 4 min.

In certain embodiments, the regenerated carbon fiber masterbatch and premix are extrusion pelletized through a twin screw extruder.

In certain embodiments, the temperature of the extrusion granulation is from 200 to 400 ℃.

In certain embodiments, the temperature of the extrusion granulation is from 270 to 295 ℃.

In certain embodiments, the screw speed is from 200 to 500 r/min.

In certain embodiments, the screw speed is from 300 to 400 r/min.

In certain embodiments, the twin screw extruder vacuum is not less than 0.8 MPa.

In certain embodiments, the regenerated carbon fiber reinforced PA66 material prepared by the preparation method of the regenerated carbon fiber reinforced PA66 material based on the ultrasonic technology has good mechanical properties.

Example 1

0.5 weight percent of MTMS, 0.5 weight percent of E-680 and 3.0 weight percent of deionized water are put into a container, heated to 95 ℃, added with 4.0 weight percent of Surlyn 9945B and stirred for 1min to prepare suspension, then 10 weight percent of FUY-CP is cut into 0.5cm by a carbon fiber chopping machine, put into the suspension for full saturation absorption, and put into an oven for drying for 3.0h at 100 ℃. Vibrating the pretreated regenerated carbon fiber for 5min by an ultrasonic vibration screen with the screen mesh diameter of 2mm at the frequency of 32KHz to prepare the regenerated carbon fiber master batch. 79.8 percent of PA66 EPR27, 5.0 percent of FG1901, 0.1 percent of FG 1076 and 0.1 percent of FG 168 are added into a mixer, the rotating speed is controlled to be 850rpm, and the stirring time is 4min to obtain the premix. Adding the premix from main feeding, adding the regenerated carbon fiber master batch from side feeding into a double-screw extruder for granulation, wherein the temperature of each section of the double-screw extruder is respectively as follows: 290 ℃, 285 ℃, 275 ℃, 270 ℃, 270 ℃, 280 ℃, 285 ℃, 285 ℃, 290 ℃, 295 ℃ of head temperature, 350r/min of screw rotation speed and not less than 0.8MPa of vacuum degree.

Example 2

MTMS 1.5 wt%, E-680 0.8 wt% and deionized water 6.9 wt% are heated to 95 deg.c in a container, and Surlyn 9945B 8.0 wt% is added and stirred for 2min to form suspension. And cutting 20% of FUY-CP into 1.8cm long pieces by using a carbon fiber chopping machine, putting the pieces into the suspension for full saturation absorption, and then putting the suspension into an oven for drying at 100 ℃ for 3.5h to dry water. Vibrating the pretreated regenerated carbon fiber for 8min by an ultrasonic vibration screen with the screen mesh diameter of 3mm at the frequency of 34KHz to prepare the regenerated carbon fiber master batch. 64.3 weight percent of PA66 EPR27, 5.0 weight percent of FG1901, 0.2 weight percent of FG 1076 and 0.2 weight percent of FG 168 are added into a mixer, the rotating speed is controlled to be 850rpm, and the stirring time is 4min to obtain the premix. Adding the premix from main feeding, adding the regenerated carbon fiber master batch from side feeding into a double-screw extruder for granulation, wherein the temperature of each section of the double-screw extruder is respectively as follows: 290 ℃, 285 ℃, 275 ℃, 270 ℃, 270 ℃, 280 ℃, 285 ℃, 285 ℃, 290 ℃, 295 ℃ of head temperature, 375r/min of screw rotation speed and not less than 0.8MPa of vacuum degree.

Example 3

2.5 weight percent of MTMS, 1.5 weight percent of E-680 and 12.0 weight percent of deionized water are put into a container and heated to 95 ℃, 12.0 weight percent of Surlyn 9945B is added and stirred for 3min to prepare suspension. And cutting 30 wt% of FUY-CP into 3.0cm long pieces by using a carbon fiber chopping machine, putting the pieces into the suspension for full saturation absorption, and then putting the suspension into an oven for drying at 100 ℃ for 4h to dry water. Vibrating the pretreated regenerated carbon fiber for 8min by an ultrasonic vibration screen with the screen mesh diameter of 5mm at the frequency of 36KHz to prepare the regenerated carbon fiber master batch. Adding 48.4 wt% of PA66 EPR27, 5.0 wt% of FG1901, 0.3 wt% of FG 1076 and 0.3 wt% of FG 168 into a mixer, controlling the rotating speed at 850rpm, and stirring for 4min to obtain the premix. Adding the premix from main feeding, adding the regenerated carbon fiber master batch from side feeding into a double-screw extruder for granulation, wherein the temperature of each section of the double-screw extruder is respectively as follows: 290 ℃, 285 ℃, 275 ℃, 270 ℃, 270 ℃, 280 ℃, 285 ℃, 285 ℃, 290 ℃, 295 ℃ of head temperature, 400r/min of screw rotation speed and not less than 0.8MPa of vacuum degree.

Example 4

A regenerated carbon fiber reinforced PA66 material was prepared according to the method of example 2, with the raw material amounts shown in table 1.

Example 5

Comparative example 1

The regenerated carbon fiber reinforced PA66 material was prepared according to the method and raw material quantities of example 2. The difference lies in that the pretreated regenerated carbon fiber is directly added into the side of the double-screw extruder for feeding without ultrasonic granulation.

Comparative example 2

A regenerated carbon fiber reinforced PA66 material was prepared according to the method of example 2, with the raw material amounts shown in table 1. Except that no graft EPDM-g-MAH was added.

Comparative example 3

A regenerated carbon fiber reinforced PA66 material was prepared according to the method of example 2, with the raw material amounts shown in table 1. Except that the chopped carbon fibers were pretreated with only the coagent and dispersant without using a binder.

Comparative example 4

A regenerated carbon fiber reinforced PA66 material was prepared according to the method of example 2, with the raw material amounts shown in table 1. Except that no coagent was used.

The materials prepared in examples 1-5 and comparative examples 1-4 were tested experimentally as follows:

(1) the tensile strength properties of the materials were tested according to ISO 527 standard, the results obtained are shown in Table 2;

(2) the flexural strength properties of the materials were tested according to ISO 178 standard, the results obtained are shown in Table 2;

(3) the flexural modulus properties of the materials were tested according to ISO 178 standard, the results obtained are shown in Table 2;

(4) the impact strength performance of the simply supported beam notch of the material is tested according to the ISO 179 standard, and the obtained result is shown in Table 2;

(5) the properties of the materials prepared in examples 1-5 were compared to those of the chopped carbon fiber reinforced PA66 materials (3101T-10V, 3101T-20V, 3101T-30V) from Toray corporation, as shown in Table 2.

As can be seen from Table 2, the data of examples 1-5 all reach the same carbon fiber content of Dongli corporation (the performance of the chopped carbon fiber reinforced PA66 material of example 1 and Dongli 3101T-10V, example 2 and example 4, example 5 and Dongli 3101T-20V, and example 3 and Dongli 3101T-30V) is more than 92% (more than 85% is regarded as pass); the data of comparative example 1 and example 2 show that the regenerated carbon fiber can not be directly pelletized with resin without special treatment; the data of the comparative example 2 and the example 2 show that the EPDM-g-MAH plays a role in chemical compatibilization in PA66 and RCF, and the strength and modulus of the carbon fiber reinforced PA66 material are obviously improved; the data of comparative example 3 and example 2 show that the binder performs a good flocculation and aggregation action in the regenerated carbon fibers; the data of comparative example 4 and example 2 show that the coagent can increase the bonding between the regenerated carbon fiber and the resin, thereby improving the mechanical properties of the composite material.

The above experimental results show that: the preparation method based on the ultrasonic technology solves the blanking problem of RCF during extrusion granulation; the RCF reinforced PP material prepared by the preparation method of the invention keeps more than 92% of the performance of the CFRP material, and the RCF reinforced PP material can be regarded as a qualified regenerated carbon fiber reinforced material if the performance of the CFRP material is kept more than 85% in the industry; the invention makes it possible to produce CFRP composite material by extruding and granulating RCF and thermoplastic resin, and widens the application of RCF.

TABLE 1 weight percent of each component (wt%)

TABLE 2 physical Properties of the respective materials

From the foregoing it will be appreciated that, although specific embodiments of the disclosure have been described herein for purposes of illustration, various modifications or improvements may be made by those skilled in the art without departing from the spirit and scope of the disclosure, and that such modifications or improvements are intended to be within the scope of the appended claims.

Claims

1. A preparation method of a regenerated carbon fiber reinforced PA66 material based on an ultrasonic technology comprises the following steps:

the regenerated carbon fiber master batch is prepared from regenerated carbon fibers, a binder and an active agent

Preparing an auxiliary agent and a dispersing agent;

the premix is prepared from PA66 resin, a graft and an antioxidant; and

extruding and granulating the regenerated carbon fiber master batch and the premix;

wherein:

the regenerated carbon fiber master batch is prepared from 10.0 to 30.0 parts of regenerated carbon fibers, 0.5 to 2.5 parts of adhesive, 4.0 to 12.0 parts of active additive and 0.5 to 1.5 parts of dispersant by weight; the premix is prepared from 45.4-81.8 parts of PA66 resin, 3.0-8.0 parts of graft and 0.2-0.6 part of antioxidant;

the regenerated carbon fiber is prepared from a recovered carbon fiber reinforced component finished product or semi-finished product or leftover material by a high-temperature cracking method, a microwave method or a dissolving method; cutting the regenerated carbon fiber, wherein the length of the regenerated carbon fiber is 0.5-3.0 cm,

the adhesive is selected from ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, aminoalkyl functionalized polydimethylsiloxane or a mixture thereof,

the coagent is selected from the group consisting of ionic ethylene copolymers,

the dispersing agent is selected from polyethylene wax, polypropylene wax, organic silicon glycol copolymer wax or the mixture thereof,

the PA66 resin has a relative viscosity of 1.0 to 5.0Pa · S,

the graft is selected from POE-g-MAH, EPDM-g-MAH, SEBS-g-MAH or the mixture thereof, the grafting rate of the graft is 1.4 to 2.0 percent,

the antioxidant is selected from hindered phenol antioxidant, phosphite antioxidant or their mixture;

the preparation method of the regenerated carbon fiber master batch comprises the following steps:

mixing a binder, a dispersant and deionized water to obtain a first mixture,

mixing a co-agent with the first mixture to obtain a second mixture,

mixing the regenerated carbon fibers with the second mixture to obtain a third mixture, an

And performing ultrasonic granulation on the third mixture by using an ultrasonic vibration sieve to obtain the regenerated carbon fiber master batch.

2. The method for preparing a recycled carbon fiber reinforced PA66 material based on an ultrasonic technology as claimed in claim 1, wherein:

the weight ratio of the first mixture to the deionized water is 4:4 to 4: 1; the mixing time of the second mixture is 1 to 10 min; the mixing temperature of the second mixture is 90 to 110 ℃; the third mixture is also dried, and the drying temperature is 50-150 ℃; the drying time is 1 to 10 hours; the vibration frequency of the ultrasonic granulation is 20 to 50 KHz; the vibration time of the ultrasonic granulation is 2-30 min; the aperture of the screen mesh of the ultrasonic vibration screen is 1-10 mm.

3. The method for preparing a recycled carbon fiber reinforced PA66 material based on an ultrasonic technology as claimed in claim 1, wherein:

mixing the PA66 resin, the graft and the antioxidant in a mixing pot to obtain the premix.

4. The method for preparing a recycled carbon fiber reinforced PA66 material based on an ultrasonic technology as claimed in claim 3, wherein:

the rotating speed of the mixing pot is 600-1500 rpm during mixing; the mixing time of the mixed materials is 1-8 min.

5. The method for preparing a recycled carbon fiber reinforced PA66 material based on an ultrasonic technology as claimed in claim 3, wherein:

extruding and granulating the regenerated carbon fiber master batch and the premix by a double-screw extruder, wherein the temperature of the extrusion and granulation is 200-400 ℃; the rotating speed of the screw is 200 to 500 r/min; the vacuum degree is not less than 0.8 MPa.

6. A regenerated carbon fiber reinforced PA66 material prepared based on the preparation method of the regenerated carbon fiber reinforced PA66 material based on the ultrasonic technology as claimed in any one of claims 1 to 5.