CN112980038B - Forming process of PC composite material - Google Patents

Forming process of PC composite material Download PDF

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CN112980038B
CN112980038B CN202110231165.XA CN202110231165A CN112980038B CN 112980038 B CN112980038 B CN 112980038B CN 202110231165 A CN202110231165 A CN 202110231165A CN 112980038 B CN112980038 B CN 112980038B
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aluminum
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CN112980038A (en
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吴成华
洪德腾
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Ningbo Fuerda Smartech Co Ltd
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/12—Chemical modification
    • C08J7/123—Treatment by wave energy or particle radiation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
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    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/02—Polysilicates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/02—Polysilicates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2483/02—Polysilicates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2483/04—Polysiloxanes
    • 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
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium

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Abstract

The invention discloses a forming process of a PC composite material, which comprises the following steps of A, PC, adding a composite nano lubricant prepared by drying alumina sol mixed with inorganic nano lubricant particles into material components of the layer, and then forming a PC layer; B. modifying the surface of the molded PC layer by pulse laser irradiation to improve the surface roughness; C. and B, preparing a coating solution from methyltrimethoxysilane, ethyl orthosilicate and aluminum sol by a gel method, coating the coating solution on the surface of the modified PC layer obtained in the step B, and drying to form the PC composite multilayer body.

Description

Forming process of PC composite material
Technical Field
The invention relates to the technical field of preparation of high polymer materials for vehicles, in particular to a forming process of a PC composite material.
Background
Plastics are increasingly used in the manufacture of automobile parts, such as automobile exterior parts, instead of metals due to a series of advantages such as excellent processability, excellent service performance, cost reduction, particularly weight reduction.
Polycarbonate (PC) is a thermoplastic engineering plastic with excellent comprehensive performance developed in the 50 s of the 20 th century, is odorless, tasteless, nontoxic, rigid and tough, and has outstanding impact resistance, dimensional stability and other heat-resistant and cold-resistant properties, and the PC or a composite material thereof is widely applied to the technical fields of electronics, automobiles, aerospace, optical disks and the like.
In the field of automobile application, most of the automobile exterior parts, such as windshields, exterior rearview mirrors, automobile front bumpers, air inlet grilles, rubbing strips, wheel hub covers and the like, have the disadvantages that the scratch resistance of the surfaces of formed products is poor, the aesthetic degree of the products is greatly reduced, the prior improvements on the aspects mainly comprise surface coating modification, modification by adding different fillers and auxiliary agents and blending modification with other polymers, and the coating modification, such as chemical vapor deposition, vacuum deposition of thin diamond protective films and sol-gel preparation of organic/inorganic mixed coatings, wherein the technical difficulties of chemical vapor deposition, vacuum deposition of thin diamond protective films and the like are high, the cost is increased, relatively speaking, the sol-gel method for preparing the organic coatings is simple in a direct coating mode and easy to implement, but has the disadvantages that the adhesion between the coatings and the plastic surfaces is not strong, aiming at the problem that the coating is easy to fall off, enterprises and research institutes on the market are more inclined to improve the coating, the applicable achievements are less, and another way for improvement is needed.
Disclosure of Invention
In order to solve at least one technical defect, the invention provides the following technical scheme:
the forming process of the PC composite material comprises the following steps
A. Adding a composite nano lubricant prepared by drying alumina sol mixed with inorganic nano lubricant particles into the material components of the PC layer, and then forming the PC layer;
B. modifying the surface of the molded PC layer by pulse laser irradiation to improve the surface roughness;
C. and (C) preparing a coating solution from methyltrimethoxysilane, ethyl orthosilicate and aluminum sol by a gel method, coating the coating solution on the surface of the modified PC layer obtained in the step (B), and drying to form the PC composite multilayer body.
The coating method is adopted in the scheme to improve the scratch resistance of the PC material, and the main principle is as follows: the aluminum sol and the inorganic nano lubricant are compounded, the characteristic that the inorganic lubricant migrates to the surface is utilized in the material forming process, the aluminum sol component combined with the aluminum sol component is brought to the surface of the PC layer, in order to further improve the bonding strength, the surface roughness is improved by modifying the surface of the PC layer in a laser irradiation mode, the aluminum sol component on the concave-convex surface layer and the component in the coating liquid form a coating with an organic-inorganic cross-linked network structure through copolycondensation reaction, and the detection shows that the coating has good bonding performance with the PC surface, and the formed PC-coating composite multilayer body has strong scratch resistance and good heat resistance.
Further, the aluminum sol and the inorganic nano lubricant particles are mixed, and are subjected to sanding, ultrasonic dispersion and drying to obtain the composite nano lubricant, and the aluminum sol and the inorganic nano lubricant are compounded into a whole so as to bring the aluminum sol component to the surface layer of the PC by using the migration effect of the lubricant.
Further, mixing aluminum alkoxide with water or alcohol to prepare aluminum sol, stirring and mixing the aluminum sol and the inorganic nano lubricant particles, adding a coupling agent KH570 for reaction, sanding, ultrasonically dispersing and drying to obtain the composite nano lubricant particles, wherein the aluminum alkoxide is convenient to perform polycondensation reaction with the components in the coating.
Further, the inorganic nano lubricant particles are wollastonite, glass beads, microfibers or talcum powder, the mass ratio of the inorganic nano lubricant to the aluminum alkoxide is 1:1-2, and the aluminum alkoxide is aluminum isopropoxide.
Further, modifying the surface of the PC layer formed in the step A by nanosecond pulsed ultraviolet laser with the wavelength of 355nm in a water film medium to form a groove-shaped appearance on the surface of the PC layer, and matching the groove-shaped appearance with the aluminum alkoxide component on the surface layer, so that the bonding strength with the coating liquid can be greatly improved.
Further, nanosecond pulsed ultraviolet laser parameters: the energy density is 24-27J/cm2The scanning speed is 800-1100mm/s, the repetition frequency is 60-85kHz, and the scanning interval is 20 μm.
Further, in the step C, methyltrimethoxysilane and tetraethoxysilane are firstly placed in an alcohol water solution to form a precursor solution, and then aluminum sol is added into the precursor solution to be uniformly mixed to form the coating solution.
Further, mixing KH570 coupling agent with alumina sol to prepare modified sol solution, and mixing the modified sol solution with precursor solution to form coating solution.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention combines the laser irradiation technology, the lubricant migration effect and the coating liquid bonding into an integrally formed PC composite multilayer body, greatly improves the bonding capability of the coating and the PC layer, and improves the scratch resistance capability of the coating.
Drawings
Fig. 1 is a diagram of a laser modified trench.
Detailed Description
The present invention will be further described with reference to the following specific examples.
In the process, the prior art is partially referred to for the preparation of composite nano lubricant particles, such as application publication No. CN107814977, which is named as an inorganic nano lubricant for plastic processing and a preparation method thereof, and the patent document discloses specific steps for preparing the relevant inorganic lubricant.
Specifically, the preparation of the composite nano lubricant particles comprises the following steps:
in the first step, an aluminum sol is mixed with inorganic nano-lubricant particles, and as described in the above patent documents, the ratio of aluminum alkoxide, alcohol, and water is set to 1: 23-45:55-100, or 1:30:60, the aluminum alkoxide is preferably isopropanol aluminum salt, the aluminum alkoxide and the alcohol water are mixed and stirred uniformly, then the mixture is added into a homogenizer to react for 4 hours at 70 ℃, the mixture is taken out and cooled to room temperature, and the aluminum sol can be obtained, or the aluminum alkoxide and the water are mixed according to the molar ratio of-1: 100, the temperature is 85 ℃, the reflux stirring is carried out for 1 hour, nitric acid is dripped to adjust the pH value to be about 3.0-3.5, the mixture is continuously refluxed and stirred for a certain time, and then the mixture is cooled and placed, at the moment, the aluminum sol is formed, and the conventional method for preparing the aluminum sol can be selected according to needs.
Secondly, preparing a composite nano lubricant, namely mixing the prepared aluminum sol with an inorganic nano lubricant, wherein the inorganic nano lubricant is wollastonite, glass microspheres, microfibers or talcum powder and the like, preferably the glass microspheres, the mass ratio of the inorganic nano lubricant to aluminum alkoxide is 1:1-2, preferably 1:1, stirring and adding a coupling agent KH570, modifying the surface properties of the glass microspheres by using the coupling agent, sanding, ultrasonically dispersing and drying to obtain the composite nano lubricant, wherein the sanding, ultrasonically dispersing and spray drying refer to the patent documents, the document is not repeated in the application, the addition of the coupling agent reduces the agglomeration phenomenon of the inorganic nano lubricant, improves the surface properties and improves the dispersibility and the sliding property in the PC material, KH550 can refer to the addition in the form of an alcohol solution, for example, 2% of the mass of the inorganic nano lubricant, the particle size of the prepared composite nano lubricant particles is about 9-12nm, and the aluminum sol and the inorganic nano lubricant are compounded into a whole.
In forming the PC layer, it is preferred that the composite nano-lubricant comprises 1% to 1.5% of the mass of the PC resin in the PC layer component, such as 0.6%, or 0.5%, or 0.8%, or 1.0%, or 1.3%, or 1.4% of the mass of the composite nano-lubricant.
When the PC layer is formed, the composite nano lubricant can be directly mixed, for example, the composite nano lubricant is directly mixed with the rest components of the PC layer and then placed in a double-screw extruder for melt blending and extrusion.
For irradiation modification, pulse laser irradiation modification is preferably performed in the scheme, nanosecond pulse ultraviolet laser with the wavelength of 355nm is used for modifying the surface of a formed PC layer in a water film medium, a groove-shaped appearance is formed on the surface of the PC layer, and the following parameters are preferably used for performing nanosecond pulse ultraviolet laser parameters: the energy density is 24-27J/cm2The scanning speed is 800-1100mm/s, the repetition frequency is 60-85kHz, and the scanning interval is 20 μm, and under the parameter setting, the groove-shaped morphology is conveniently formed on the surface of the PC, as shown in FIG. 1, and of course, other wavelength lasers can be selected for modification according to the situation.
As for the setting of the water film medium, for example, a thin uniform water film is covered on the surface of the PC layer, the thickness of the water film is 50-70 μm, a laser irradiation system is arranged above the PC layer, and irradiation modification can be carried out after parameters are set.
The preparation of the coating solution, including the preparation of the aluminum sol and the preparation of the precursor solution, the preparation of the aluminum sol is preferably performed by the method described above, and after the aluminum sol is formed, the coupling agent KH570 is preferably added to form a modified aluminum sol, for example, 2% by mass of aluminum isopropoxide.
The precursor solution is prepared by mixing methyltrimethoxysilane and tetraethoxysilane in a molar ratio of 1:1, placing the mixture in an alcohol aqueous solution under an acidic condition, stirring and reacting for 1 hour to form the precursor solution, adding KH550 modified aluminum sol solution, such as the molar ratio of the aluminum sol to the methyltrimethoxysilane in the precursor solution is 1:2-5, mixing and stirring, and aging for 1 hour to obtain the coating solution.
Next, a PC composite multilayer body was prepared in specific examples, and the specific preparation method was as follows.
The material composition of the PC layer is as follows by mass:
60 parts of bisphenol A type polycarbonate resin, and 60 parts of medium-viscosity PC resin with the melt index of 10-13g/10 min.
25 parts of ABS resin and 275 parts of ABS.
5 parts of toughening agent and C-223A.
0.5 part of antioxidant and 1076 parts of antioxidant.
Lubricant, glass beads or composite nano-lubricant.
Preparing aluminum sol: mixing aluminum isopropoxide and water according to a molar ratio of-1: 100, refluxing and stirring at 85 ℃ for 1h, dropwise adding nitric acid to adjust the pH value to be about 3.0-3.5, continuously refluxing and stirring for a certain time, cooling and standing.
Preparing modified aluminum sol: mixing aluminum isopropoxide and water according to a molar ratio of-1: 100, refluxing and stirring at 85 ℃ for 1h, dropwise adding nitric acid to adjust the pH to be about 3.0-3.5, continuously refluxing and stirring for a certain time, adding KH550 coupling agent, and adding the coupling agent according to 2% of the mass of the aluminum isopropoxide.
Preparing composite nano lubricant particles: mixing the prepared aluminum sol with a glass bead lubricant, mixing an inorganic nano lubricant and aluminum isopropoxide according to the mass ratio of 1:1, stirring, adding a coupling agent KH570 in an amount of 2% of the mass of the inorganic nano lubricant, sanding, ultrasonically dispersing, and drying to obtain the composite nano lubricant, wherein the particle size of the prepared composite nano lubricant particles is about 9-12 nm.
Preparation of masking liquid: mixing methyltrimethoxysilane and tetraethoxysilane according to a molar ratio of 1:1, placing the mixture in an alcohol water solution under an acidic condition, stirring and reacting for 1 hour to form a precursor solution, adding KH550 modified aluminum sol solution, mixing and stirring the modified aluminum sol solution and the methyltrimethoxysilane in the precursor solution according to a molar ratio of 1:5, and aging for 1 hour to obtain the coating solution.
Example 1
In practice, the forming process of the PC composite material comprises the following steps
A. And adding 0.6 part of composite nano lubricant into the material components of the PC layer, mixing and stirring, and then placing the mixture into a double-screw extruder to extrude and form the PC layer, wherein the parameters of the double-screw extruder are common parameters.
B. Covering a thin uniform water film on the PC layer formed in the step A, wherein the thickness of the water film is 50-60 mu m, installing a laser irradiation system above the PC layer, and setting parameters of a nanosecond pulse ultraviolet laser device: the energy density is 24-27J/cm2The scanning speed is 1000-1100mm/s, the repetition frequency is 85kHz, the scanning interval is 20 mu m, and under the parameter setting, the groove-shaped appearance is formed on the surface of the PC.
C. And D, coating the surface of the modified PC layer in the step B with a coating liquid prepared by a gel method through methyltrimethoxysilane, ethyl orthosilicate and aluminum sol, and drying to form the PC composite multilayer body.
Example 2
In practice, the forming process of the PC composite material comprises the following steps
A. And adding 0.7 part of composite nano lubricant into the material components of the PC layer, mixing and stirring, and then placing the mixture into a double-screw extruder to extrude and form the PC layer, wherein the parameters of the double-screw extruder are common parameters.
B. Covering a thin uniform water film on the PC layer formed in the step A, wherein the thickness of the water film is 60-70 mu m, installing a laser irradiation system above the PC layer, and setting parameters of a nanosecond pulse ultraviolet laser device: the energy density is 24-27J/cm2The scanning speed is 800-1000mm/s, the repetition frequency is 60kHz, the scanning interval is 20 μm, and the parameters are set so that the groove shape is formed on the surface of the PCAnd (5) appearance.
C. And D, coating the surface of the modified PC layer in the step B with a coating liquid prepared by a gel method through methyltrimethoxysilane, ethyl orthosilicate and aluminum sol, and drying to form the PC composite multilayer body.
Comparative example 1
The components of the PC layer material and the lubricant glass beads are directly mixed and stirred and then placed into a double-screw extruder to form the PC layer, and the coating liquid prepared in the example 1 is coated on the PC layer, wherein the parameters are consistent with those of the example 1.
Comparative example 2
The PC layer prepared in comparative example 1 was radiation-modified by the laser irradiation method described in example 1, after which the coating liquid prepared in example 1 was applied, with the parameter settings being in accordance with example 1.
Comparative example 3
The PC layer prepared in the procedure of example 1 was directly coated with a coating solution, and the parameters were identical to those of example 1.
The PC composite multilayer bodies prepared as described above were examined as shown in the following table
TABLE 1
Figure GDA0003342384590000051
It can be seen from table 1 that the bonding structure of the coating and the surface of the PC layer is greatly improved by using the laser irradiation modification in combination with the bonding structure of the composite nano lubricant, the composite nano lubricant and the glass bead lubricant have little influence on the mechanical properties of the PC layer at the same mass part, and the pencil hardness of the PC composite multilayer film reaches 2H.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (8)

  1. The molding process of the PC composite material is characterized by comprising the following steps: comprises the following steps
    A. Adding a composite nano lubricant prepared by drying alumina sol mixed with inorganic nano lubricant particles into the material components of the PC layer, and then forming the PC layer;
    B. modifying the surface of the molded PC layer by pulse laser irradiation to improve the surface roughness;
    C. and (C) preparing a coating solution from methyltrimethoxysilane, ethyl orthosilicate and aluminum sol by a gel method, coating the coating solution on the surface of the modified PC layer obtained in the step (B), and drying to form the PC composite multilayer body.
  2. 2. The process for molding a PC composite material according to claim 1, wherein: and mixing the aluminum sol and the inorganic nano lubricant particles, and performing sanding, ultrasonic dispersion and drying to obtain the composite nano lubricant.
  3. 3. The process for molding a PC composite material according to claim 2, wherein: mixing aluminum alkoxide with water or alcohol to prepare aluminum sol, stirring and mixing the aluminum sol and inorganic nano lubricant particles, adding a coupling agent KH570 for reaction, and then sanding, ultrasonically dispersing and drying to obtain the composite nano lubricant particles.
  4. 4. The process for molding a PC composite material as claimed in claim 3, wherein: the inorganic nano lubricant particles are wollastonite, glass beads, microfibers or talcum powder, the mass ratio of the inorganic nano lubricant to the aluminum alkoxide is 1:1-2, and the aluminum alkoxide is aluminum isopropoxide.
  5. 5. The process for molding a PC composite material according to claim 1, wherein: modifying the surface of the PC layer formed in the step A by nanosecond pulsed ultraviolet laser with the wavelength of 355nm in an aqueous film medium to form a groove-shaped appearance on the surface of the PC layer.
  6. 6. The PC complex of claim 5The forming process of the composite material is characterized by comprising the following steps: nanosecond pulsed ultraviolet laser parameters: the energy density is 24-27J/cm2The scanning speed is 800-1100mm/s, the repetition frequency is 60-85kHz, and the scanning interval is 20 μm.
  7. 7. The process for molding a PC composite material according to claim 1, wherein: in the step C, methyltrimethoxysilane and tetraethoxysilane are firstly put into an alcohol water solution to form a precursor solution, and then aluminum sol is added into the precursor solution to be uniformly mixed to form the coating solution.
  8. 8. The process for molding a PC composite as claimed in claim 7, wherein: mixing KH570 coupling agent with alumina sol to prepare modified sol solution, and mixing the modified sol solution with precursor solution to form coating solution.
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Citations (4)

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