CN113604069A - Plastic shell of electronic product and preparation method thereof - Google Patents
Plastic shell of electronic product and preparation method thereof Download PDFInfo
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- CN113604069A CN113604069A CN202110673155.1A CN202110673155A CN113604069A CN 113604069 A CN113604069 A CN 113604069A CN 202110673155 A CN202110673155 A CN 202110673155A CN 113604069 A CN113604069 A CN 113604069A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
- C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
- C08L101/06—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14868—Pretreatment of the insert, e.g. etching, cleaning
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/18—Spheres
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides an electronic product plastic shell and a preparation method thereof, wherein the electronic product plastic shell comprises a metal layer and a material layer, the metal layer is a stainless steel plate, and the material layer comprises the following components in parts by weight: 20-25 parts of silicon-boron-fluorine-containing copolymer, 60-90 parts of fluorenone-based polycondensate, 30-45 parts of metal-like plastic particles, 6-8 parts of carbon nano-fiber, 5-10 parts of coupling agent, 3-5 parts of nano titanium dioxide, 10-30 parts of impact modifier and 0.3-0.8 part of methyl methacrylate microsphere. The invention can further reduce the cracks of the plastic shell in the preparation, transportation and use processes by utilizing the compactness and the tensile property of the plastic shell and utilizing the good compression resistance and tensile property of the plastic shell so as to prolong the service life of the plastic shell.
Description
Technical Field
The invention mainly relates to the technical field of medical electronic product preparation, in particular to an electronic product plastic shell and a preparation method thereof.
Background
Medical electronic equipment is a general name of a series of medical equipment and is used for heart treatment and emergency treatment devices, and medical electronic product shells are usually obtained by injection molding, blow molding, extrusion and die casting through molds.
According to the high-strength wear-resistant plastic material and the preparation method thereof provided by the patent document with the application number of CN201810316104.1, the material is prepared from the following components in parts by weight: 65-85 parts of a fluorenone-based polycondensate, 15-25 parts of a silicon-boron-fluorine-containing copolymer, 5-10 parts of carbon nano fibers, 1-3 parts of an impact modifier and 1-3 parts of a toughening agent. The preparation method of the high-strength wear-resistant plastic material comprises the following steps: s1, putting the components into a high-speed mixer in proportion, and uniformly mixing to obtain a mixture; s2, pouring the mixture obtained in the step S1 into a double-screw extruder for extrusion molding; s3, cooling the extrudate obtained in the step S2 by using circulating water at the temperature of 8-12 ℃, cutting into granules and packaging to obtain a plastic material finished product. The high-strength wear-resistant plastic material disclosed by the product has the characteristics of oil resistance, wear resistance, good oxidation resistance, good flame retardant effect and high strength.
According to the materials, the silicon-boron-fluorine-containing copolymer, the carbon nanofiber and the fluorenone-based polycondensate are applied to the preparation of the plastic, and the plastic is widely applied to the preparation of electronic products, so that the oil resistance and the wear resistance can be obtained, but the silicon-boron-fluorine-containing copolymer, the carbon nanofiber and the fluorenone-based polycondensate improve the wear resistance of the material by introducing structures containing silicon-oxygen bonds, fluorocarbon, boron and the like, and the service life of the material is seriously influenced if the material is extruded for a long time.
Disclosure of Invention
The invention mainly provides an electronic product plastic shell and a preparation method thereof, which are used for solving the technical problems in the background technology.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the plastic shell of the electronic product comprises a metal layer and a material layer, wherein the metal layer is a stainless steel plate, and the material layer comprises the following components in parts by weight: 20-25 parts of silicon-boron-fluorine-containing copolymer, 60-90 parts of fluorenone-based polycondensate, 30-45 parts of metal-like plastic particles, 6-8 parts of carbon nano-fiber, 5-10 parts of coupling agent, 3-5 parts of nano titanium dioxide, 10-30 parts of impact modifier and 0.3-0.8 part of methyl methacrylate microsphere.
Furthermore, the impact modifier is one or more of chlorinated polyethylene, methyl methacrylate-butadiene-styrene copolymer and acrylonitrile-butadiene-styrene copolymer, and the impact modifier is commercially available and is relatively easy to purchase.
Furthermore, the crystal form of the nano titanium dioxide is anatase type, the particle size is 10 nm-10 mu m, and the fracture resistance and the compression resistance of the material layer and the photocatalytic function for purifying air are ensured.
Furthermore, the particle size of the methyl methacrylate microspheres is 10 nm-10 microns, and the compactness of the vegetable material layer is improved.
Further, the metal-like plastic particles are prepared by the following steps:
step 1, performing phosphating treatment and anodic oxidation treatment on the surface of metal powder of 350-550 meshes, and drying the metal powder after the phosphating treatment and the anodic oxidation treatment;
and 2, placing the dried metal powder obtained in the step 1, 5-10 parts of impact modifier, 5-10 parts of coupling agent and 30-40 parts of resin into a high-speed mixer for premixing, and then putting the premix into a double-screw granulator for granulation to obtain metal-like plastic particles, so that the structural strength of the plastic shell is improved through the metal powder while the smoothness of the plastic shell is kept.
Further, the element material layer is prepared by the following steps:
step (1), placing water, nano titanium dioxide and an impact modifier into a stirring pot machine to be uniformly mixed, wherein the mixing speed of the stirring machine is 120-;
step (2), putting the molten silicon-boron-fluorine-containing copolymer, the fluorenone-based polycondensate, the carbon nano-fiber and the metal-like plastic particles into a stirrer, and mixing the molten silicon-boron-fluorine-containing copolymer, the fluorenone-based polycondensate, the carbon nano-fiber and the metal-like plastic particles with the mixed solution obtained in the step (1), wherein the mixing speed of the stirrer is 300-500r/min, and the mixing time is 2-15 min;
and (3) adding the methyl methacrylate microspheres into a stirrer, and mixing the methyl methacrylate microspheres with the mixed solution prepared in the step (2), wherein the mixing speed of the stirrer is 60-80r/min, the mixing time is 5-12min, and the material layer is formed by introducing silicon-oxygen bonds, fluorocarbon, boron and other structures into the silicon-boron-fluorine copolymer, the carbon nanofibers and the fluorenone-based polycondensate, so that the weather resistance and the chemical stability of the material layer are improved, and the wear resistance and the oil resistance are enhanced.
According to the above technical scheme of the plastic shell of the electronic product, a preparation method of the plastic shell of the electronic product is also provided, which comprises the following steps:
firstly, carrying out corrosion etching treatment on the surface of a metal layer to form a rough etching contact surface, spraying an accelerant on the injection molding contact surface, and placing the sprayed metal layer in a set mold;
step two, pouring the material layer into a double-screw extruder, extruding the material layer into an injection mold through the double-screw extruder to be combined with the metal layer placed in the step one, and extruding after injection molding;
and step three, cooling and washing the extrudate obtained in the step two by using circulating water at the temperature of 8-12 ℃.
Furthermore, in the first step, the etching temperature for strengthening corrosion of the etching contact surface is 60-70 ℃.
Further, in the second step, the injection pressure in the process of in-film injection molding is 230-250 MPa, and the pressure maintaining time is 60-120 s.
Further, in the third step, the extrudate is cleaned by ultrasonic treatment in cooperation with circulating water, so that water cleaning is performed by ultrasonic waves in cooperation with a spray head.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the invention fills the gap in the plastic layer through the methyl methacrylate microspheres, improves the compactness of the plastic layer, and further reduces the cracks of the plastic shell in the preparation, transportation and use processes by utilizing the good compression resistance and tensile resistance of the plastic shell, so as to prolong the service life of the plastic shell.
Secondly, the metal-like plastic particles can graft the metal powder on the resin through the coupling agent, so that the metal powder and the resin form a whole, and the structural strength of the plastic shell is improved through the metal powder while the smoothness of the plastic shell is kept.
Thirdly, the welding traces on the surface of the plastic shell are reduced by the injection molding combination mode of the element material layer and the metal layer, so that the structure strength of the plastic shell is improved while the appearance is kept attractive;
and fourthly, the nano titanium dioxide is easy to fuse with water and the impact modifier, so that the breaking resistance and the compression resistance of the element material layer and the photocatalytic function of purifying air are improved through the nano titanium dioxide.
The present invention will be explained in detail below with reference to specific examples.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully hereinafter with reference to several embodiments, which may be embodied in different forms and are not limited to the embodiments described herein, but are provided for the purpose of making the disclosure more thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.
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, and the knowledge of the terms used herein in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Embodiment 1, in a preferred embodiment of the present invention, an electronic product plastic housing includes a metal layer and a material layer, wherein the metal layer is a stainless steel plate, and the material layer is composed of the following components in parts by weight: 20-25 parts of silicon-boron-fluorine-containing copolymer, 60-90 parts of fluorenone-based polycondensate, 30-45 parts of metal-like plastic particles, 30-40 parts of resin, 6-8 parts of carbon nano fiber, 5-10 parts of coupling agent, 3-5 parts of nano titanium dioxide, 10-30 parts of impact modifier and 0.3-0.8 part of methyl methacrylate microsphere.
Furthermore, the impact modifier is one or more of chlorinated polyethylene, methyl methacrylate-butadiene-styrene copolymer and acrylonitrile-butadiene-styrene copolymer, and the impact modifier is commercially available and is relatively easy to purchase.
Furthermore, the crystal form of the nano titanium dioxide is anatase type, the particle size is 10 nm-10 mu m, and the crystal form of the nano titanium dioxide is anatase type, the particle size is 10 nm-10 mu m, so that the nano titanium dioxide is easily fused with water and an impact modifier, and after a plain material layer is prepared by workers, the fracture resistance and the compression resistance of the plain material layer and the photocatalytic function of purifying air are ensured.
Furthermore, the particle size of the methyl methacrylate microspheres is 10 nm-10 μm, the clearance in the matrix layer is filled by the methyl methacrylate microspheres, the compactness of the matrix layer is improved, and the good compression resistance and tensile resistance of the matrix layer are utilized to further reduce cracks of the plastic shell in the preparation, transportation and use processes, so that the service life of the plastic shell is prolonged. Further, the metal-like plastic particles are prepared by the following steps:
step 1, performing phosphating treatment and anodic oxidation treatment on the surface of metal powder with 350-550 meshes, and drying the metal powder after the phosphating treatment and the anodic oxidation treatment.
And 2, placing the dried metal powder obtained in the step 1, 5-10 parts of impact modifier and 30-40 parts of resin into a high-speed mixer for premixing, then putting the premix into a double-screw granulator for granulation to obtain metal-like plastic particles, grafting the metal powder onto the resin through a coupling agent to enable the metal powder and the resin to form a whole, and improving the structural strength of the plastic shell through the metal powder while keeping the smoothness of the plastic shell.
Further, the element material layer is prepared by the following steps:
step (1), placing water, nano titanium dioxide and an impact modifier into a stirring pot machine to be uniformly mixed, wherein the mixing speed of the stirring machine is 120-;
step (2), putting the molten silicon-boron-fluorine-containing copolymer, the fluorenone-based polycondensate, the carbon nano-fiber and the metal-like plastic particles into a stirrer, and mixing the molten silicon-boron-fluorine-containing copolymer, the fluorenone-based polycondensate, the carbon nano-fiber and the metal-like plastic particles with the mixed solution obtained in the step (1), wherein the mixing speed of the stirrer is 300-500r/min, and the mixing time is 2-15 min;
and (3) adding the methyl methacrylate microspheres into a stirrer, and mixing with the mixed solution prepared in the step (2), wherein the mixing speed of the stirrer is 60-80r/min, and the mixing time is 5-12 min.
The silicon-boron-fluorine copolymer, the carbon nanofiber and the fluorenone polycondensate are introduced into the matrix layer to form silicon-oxygen bonds, fluorocarbon, boron and other structures, so that the weather resistance and the chemical stability of the matrix layer are improved, and the wear resistance and the oil resistance are enhanced.
According to the above technical scheme of the plastic shell of the electronic product, a preparation method of the plastic shell of the electronic product is also provided, which comprises the following steps:
firstly, carrying out corrosion etching treatment on the surface of a metal layer to form a rough etching contact surface, spraying an accelerant on the injection molding contact surface, and placing the sprayed metal layer in a set mold;
step two, pouring the material layer into a double-screw extruder, extruding the material layer into an injection mold through the double-screw extruder to be combined with the metal layer placed in the step one, and extruding after injection molding;
step three, cooling and washing the extrudate obtained in the step two by using circulating water at the temperature of 8-12 ℃;
through the mode that the plain matter layer combines with the metal level of moulding plastics, reduce the welding trace on plastic shell surface to when keeping pleasing to the eye, improved the structural strength of plastic shell.
Furthermore, in the first step, the etching temperature for strengthening corrosion of the etching contact surface is 60-70 ℃.
Further, in the second step, the injection pressure in the process of in-film injection molding is 230-250 MPa, and the pressure maintaining time is 60-120 s.
Further, in the third step, the extrudate is cleaned by ultrasonic treatment in cooperation with circulating water, so that water cleaning is performed by ultrasonic waves in cooperation with a spray head.
Example 2
The raw materials were weighed according to the data in example 2 of Table 1.
The preparation method is the same as example 1.
Example 3
The raw materials were weighed according to the data in example 3 in Table 1.
The preparation method is the same as example 1.
Example 4
The raw materials were weighed according to the data in example 4 of Table 1.
The preparation method is the same as example 1.
Example 5
Weighing the raw materials according to the data of the example 5 corresponding to the table I;
according to the technical scheme of the plastic shell of the electronic product provided by the embodiment 5, a preparation method of the plastic shell of the electronic product is further provided, and the preparation method comprises the following steps:
s1, putting the silicon-boron-fluorine-containing copolymer, the fluorenone-based polycondensate and the metal-like plastic particles into a high-speed mixer, and uniformly mixing;
s2, putting the mixture obtained in the step S1 into a double-screw extruder for extrusion molding;
s3, washing the extrudate obtained in S2 with tap water.
Example 6
Weighing the raw materials according to the data of the example 5 corresponding to the table I;
the preparation method is the same as example 5.
The electronic product plastic shell formula in each embodiment is as follows: kilogram (kilogram)
Examples 1 to 4 are plastic housings of electronic products prepared by the present invention, examples 5 to 6 are plastic housings of electronic products prepared by a conventional process, and comparative tests were performed on the plastic housings of electronic products prepared in examples 1 to 6 and plastic housings of commercially available electronic products, and the results are shown in table two.
Table two: performance test of the footbath solutions prepared in examples 1 to 7 and comparative commercial footbath solutions
The specific operation mode of the invention is as follows:
when the electronic product shell is prepared, firstly, corrosion etching treatment is carried out on the surface of a metal layer to form a rough etching contact surface, an accelerant is sprayed on the injection molding contact surface, the sprayed metal layer is placed in a set mold, then a material layer is poured into a double-screw extruder, the material layer is extruded into the injection mold through the double-screw extruder to be combined with the metal layer placed in the first step, extrusion is carried out after injection molding, and finally, the extrudate obtained in the second step is cooled and washed by circulating water at the temperature of 8-12 ℃.
The invention has been described in an illustrative manner, and it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description, since such modifications are intended to be included within the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The plastic shell of the electronic product comprises a metal layer and a material layer, and is characterized in that the metal layer is a stainless steel plate, and the material layer comprises the following components in parts by weight: 20-25 parts of silicon-boron-fluorine-containing copolymer, 60-90 parts of fluorenone-based polycondensate, 30-45 parts of metal-like plastic particles, 30-40 parts of resin, 6-8 parts of carbon nano fiber, 5-10 parts of coupling agent, 3-5 parts of nano titanium dioxide, 10-30 parts of impact modifier and 0.3-0.8 part of methyl methacrylate microsphere.
2. The plastic housing for electronic products as claimed in claim 1, wherein the impact modifier is one or more of chlorinated polyethylene, methyl methacrylate-butadiene-styrene copolymer and acrylonitrile-butadiene-styrene copolymer.
3. The electronic product plastic housing as claimed in claim 1, wherein the nano titanium dioxide has an anatase crystal form and a particle size of 10nm to 10 μm.
4. The plastic housing of claim 1, wherein the methyl methacrylate microspheres have a particle size of 10nm to 10 μm.
5. The plastic housing of claim 1, wherein the metal-like plastic particles are prepared by the following steps:
step 1, performing phosphating treatment and anodic oxidation treatment on the surface of metal powder of 350-550 meshes, and drying the metal powder after the phosphating treatment and the anodic oxidation treatment;
and 2, placing the dried metal powder obtained in the step 1, 5-10 parts of impact modifier and 30-40 parts of resin into a high-speed mixer for premixing, and then putting the premix into a double-screw granulator for granulation to obtain the metal-like plastic particles.
6. The plastic housing of claim 1, wherein the plastic layer is prepared by the following steps:
step (1), placing water, nano titanium dioxide and an impact modifier into a stirring pot machine to be uniformly mixed, wherein the mixing speed of the stirring machine is 120-;
step (2), putting the molten silicon-boron-fluorine-containing copolymer, the fluorenone-based polycondensate, the carbon nano-fiber and the metal-like plastic particles into a stirrer, and mixing the molten silicon-boron-fluorine-containing copolymer, the fluorenone-based polycondensate, the carbon nano-fiber and the metal-like plastic particles with the mixed solution obtained in the step (1), wherein the mixing speed of the stirrer is 300-500r/min, and the mixing time is 2-15 min;
and (3) adding the methyl methacrylate microspheres into a stirrer, and mixing with the mixed solution prepared in the step (2), wherein the mixing speed of the stirrer is 60-80r/min, and the mixing time is 5-12 min.
7. A preparation method of an electronic product plastic shell is characterized by comprising the following steps:
firstly, carrying out corrosion etching treatment on the surface of a metal layer to form a rough etching contact surface, spraying an accelerant on the injection molding contact surface, and placing the sprayed metal layer in a set mold;
step two, pouring the material layer into a double-screw extruder, extruding the material layer into an injection mold through the double-screw extruder to be combined with the metal layer placed in the step one, and extruding after injection molding;
and step three, cooling and washing the extrudate obtained in the step two by using circulating water at the temperature of 8-12 ℃.
8. The method for manufacturing an electronic plastic housing according to claim 1, wherein in the first step, the etching temperature for etching the contact surface is 60-70 ℃.
9. The method for manufacturing an electronic product plastic case according to claim 1, wherein in the second step, the injection pressure during the in-mold injection molding process is 230 to 250MPa, and the pressure holding time is 60 to 120 s.
10. The method as claimed in claim 1, wherein the step three is performed by cleaning the extrudate with ultrasonic treatment and circulating water.
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