CN111961341A - Composite material, preparation method thereof, fixing frame and wall switch - Google Patents
Composite material, preparation method thereof, fixing frame and wall switch Download PDFInfo
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- CN111961341A CN111961341A CN202010865718.2A CN202010865718A CN111961341A CN 111961341 A CN111961341 A CN 111961341A CN 202010865718 A CN202010865718 A CN 202010865718A CN 111961341 A CN111961341 A CN 111961341A
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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
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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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
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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
- C08L2205/05—Polymer mixtures characterised by other features containing polymer components which can react with one another
Abstract
The invention discloses a composite material, a preparation method thereof, a fixing frame and a wall switch, relates to the technical field of switches, and can prevent the deformation of the fixing frame. The composite material comprises, by mass, 33-45 parts of polyamide, 8-20 parts of naphthalene-containing polyester, 20-35 parts of chopped glass fiber and 0.5-3 parts of a compatilizer. The preparation method of the composite material comprises the following steps: the polyamide, the polyester containing naphthalene and the compatilizer are uniformly mixed to obtain a uniformly mixed material, and then the uniformly mixed material and the chopped glass fiber are melted and blended. The fixing frame is made of the composite material or the composite material prepared by the preparation method of the composite material. The wall switch comprises the fixing frame.
Description
Technical Field
The invention relates to the technical field of switches, in particular to a composite material, a preparation method of the composite material, a fixing frame and a wall switch.
Background
The wall switch is an electrical appliance switch installed on a wall, and is mainly used for switching on and off the power supply of an electrical appliance. Referring to fig. 1, a wall switch generally includes a cassette 1, a holder 2, and a cover plate 3. The cassette 1 is generally fixed inside a wall, and the cassette 1 is provided with a threaded hole. The fixing frame is provided with mounting screws 5, and the mounting screws 5 are matched with the threaded holes, so that the fixing frame 2 can be fixed on the cassette 1. Meanwhile, the fixing frame 2 is also provided with a switch component which can control the connection and disconnection of the power supply of the electric appliance. The cover plate 3 is connected with the switch assembly, so that the power supply of the electric appliance can be controlled to be switched on and off when the cover plate 3 is pressed.
At present, the fixing frame 2 is mainly made of Polycarbonate (abbreviated as PC) or glass fiber reinforced Polycarbonate (frp) by injection molding. However, the rigidity and toughness of the resulting fastening frame 2 are poor due to the poor rigidity and toughness of polycarbonate and glass fiber reinforced polycarbonate. At this time, when the fixing frame 2 is fixed on the cassette 1 by the mounting screws 5, the fixing frame 2 may be bent or cracked under the extrusion of the mounting screws 5, which affects the installation and use of the cover plate 3, resulting in the failure of the wall switch.
In order to improve the rigidity and toughness of the holder 2 and prevent the holder 2 from being severely bent and deformed when being fixed to the cassette 1 by the mounting screws 5, Polyamide (commonly known as nylon, Polyamide, abbreviated as PA) and chopped glass fiber may be mixed to obtain a mixture, and then the mixture may be injection molded to obtain the holder 2. In this case, since polyamide has good toughness, rigidity, and processing fluidity, the obtained fixing frame 2 also has high toughness and rigidity.
However, the amide group (-NHCO-) in the polyamide molecule is likely to form a hydrogen bond with water molecules, so that the obtained fixing frame 2 is likely to absorb water to generate a plasticizing effect, and the fixing frame 2 is likely to have problems of volume expansion and rigidity reduction, so that the fixing frame 2 is still likely to be seriously deformed when being fixed on the cassette 1 by the mounting screws 5. Meanwhile, the polyamide is crystallized during injection molding, and the crystallization rate is high, so that the crystals formed in the injection molding process of the polyamide have the problems of large volume and uneven volume, and the fixed frame 2 obtained by injection molding of the polyamide is warped and deformed, thereby affecting the installation and use of the cover plate 3.
Disclosure of Invention
The invention aims to provide a composite material, a preparation method thereof, a fixing frame and a wall switch, which are used for preventing the deformation of the fixing frame.
In order to achieve the above object, the present invention provides a composite material. The composite material comprises the following components in parts by mass: 33 to 45 portions of polyamide, 8 to 20 portions of naphthalene polyester, 20 to 35 portions of chopped glass fiber and 0.5 to 3 portions of compatilizer.
Compared with the prior art, the composite material provided by the invention has the naphthalene-containing polyester, and the naphthalene ring with higher rigidity is arranged in the molecular chain of the naphthalene-containing polyester, so that the composite material has better rigidity, better strength and higher heat resistance.
And the naphthalene ring in the naphthalene-containing polyester is planar and has good gas barrier property, so that the naphthalene-containing polyester can prevent an amide group (-NHCO-) in a polyamide molecule from contacting water in the air, the water absorption performance of the polyamide in the composite material can be effectively reduced, the polyamide can keep good dimensional stability and high rigidity, the composite material also has good dimensional stability and high rigidity, and the degree of bending deformation of the fixing frame prepared from the composite material under the extrusion of a mounting screw is reduced.
Meanwhile, the polyamide in the composite material can perform ester-amide exchange reaction with the naphthalene-containing polyester, and can properly inhibit the crystallization rate of the composite material during injection molding, so that the volume of crystals formed in the injection molding process of the composite material is smaller and more uniform, and the phenomenon of buckling deformation of a fixing frame obtained by injection molding of the composite material can be prevented.
The invention also provides a preparation method of the composite material. The preparation method of the composite material comprises the following steps:
preparing a uniformly mixed material: mixing 33-45 parts by mass of polyamide, 8-20 parts by mass of naphthalene-containing polyester and 0.5-3 parts by mass of a compatilizer to obtain a uniformly mixed material;
preparing a composite material: and melting and blending the uniformly mixed material and 20-35 parts by mass of chopped glass fibers to obtain the composite material.
Compared with the prior art, the preparation method of the composite material provided by the invention has the same beneficial effects as the composite material, and is not repeated herein.
The invention also provides a fixing frame. The fixing frame is made of the composite material or the composite material prepared by the preparation method of the composite material.
Compared with the prior art, the beneficial effects of the fixing frame provided by the invention are the same as those of the composite material, and are not described herein again.
The invention also provides a wall switch. The wall switch comprises the fixing frame.
Compared with the prior art, the wall switch provided by the invention has the same beneficial effects as the fixing frame, and the details are not repeated herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural view of a wall switch in the related art;
fig. 2 is a preparation flow chart of a preparation method of the composite material provided by the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The wall switch is an electrical appliance switch installed on a wall, and is mainly used for switching on and off the power supply of an electrical appliance. Referring to fig. 1, a wall switch generally includes a cassette 1, a holder 2, and a cover plate 3. The cassette 1 is generally fixed inside a wall, and the cassette 1 is provided with a threaded hole. The fixing frame is provided with mounting screws 5, and the mounting screws 5 are matched with the threaded holes, so that the fixing frame 2 can be fixed on the cassette 1. Meanwhile, the fixing frame 2 is also provided with a switch component which can control the connection and disconnection of the power supply of the electric appliance. The cover plate 3 is connected with the switch assembly, so that the power supply of the electric appliance can be controlled to be switched on and off when the cover plate 3 is pressed. The surface of the fixing frame 2 is provided with a panel 5 which can prevent dust from entering into the fixing frame 2.
As a main bearing part of the wall switch, the fixing frame is mainly made of polycarbonate or glass fiber reinforced polycarbonate by injection molding. Wherein the mass fraction of glass fibers (glass fibers, abbreviated as GF) in the glass fiber reinforced polycarbonate is 15%. However, the rigidity and toughness of the fixing frame obtained by injection molding are poor due to poor rigidity and toughness of polycarbonate and glass fiber reinforced polycarbonate, so that when the fixing frame is fixed on a cassette through mounting screws, the fixing frame can be bent and deformed under the extrusion of the mounting screws, the mounting and the use of the cover plate are affected, and the wall switch fails.
In order to improve the rigidity and toughness of the fixing frame and prevent the fixing frame from bending and deforming, a mixture of Polyamide (commonly known as nylon, Polyamide, abbreviated as PA) and chopped glass fiber can be used as a raw material, and the fixing frame can be obtained by injection molding. In this case, since polyamide has good toughness, rigidity and processing fluidity, the obtained fixing frame also has high toughness and rigidity.
However, amide groups (-NHCO-) in polyamide molecules are easy to form hydrogen bonds with water molecules, so that the obtained fixing frame is easy to absorb water to generate a plasticizing effect, the obtained fixing frame is easy to have the problems of volume expansion and rigidity reduction, and the fixing frame still has a bending deformation phenomenon when being fixed on a wall through screws. Meanwhile, polyamide can be crystallized during injection molding, and the crystallization rate is high, so that the problems of large volume and uneven volume of crystals formed in the injection molding process of polyamide exist, and the fixed frame obtained by injection molding of polyamide can be warped and deformed.
In the related art, the fixing frame may be obtained by injection molding using a mixture of glass fiber, Polyamide and Polypropylene (PP). However, the mechanical and heat resistance of the resulting mount is greatly reduced due to the poor mechanical and heat resistance of polypropylene, and the mount is still subject to bending deformation when it is fixed to a cassette by mounting screws.
In the related art, a mixture of glass fiber, polybutylene terephthalate (abbreviated as PBT) and polycaprolactam (commonly known as PA6) is also used as a raw material to prepare the fixing frame. At this time, although the polybutylene terephthalate can reduce the water absorption performance of the mount, the strength, rigidity, and heat resistance of the mount are all reduced, and the mount is fixed to the mounting screws by the mounting screws, and the mount may be bent or cracked.
Embodiment one
In order to prevent the deformation of the fixing frame and ensure the normal use of the wall switch, referring to fig. 2, the invention provides a composite material. The composite material comprises the following components in percentage by mass:
33 to 45 portions of polyamide, 8 to 20 portions of naphthalene polyester, 20 to 35 portions of chopped glass fiber and 0.5 to 3 portions of compatilizer. It should be understood that: the naphthalene-containing polyester refers to a polymer having a naphthalene ring and obtained by polycondensation of a polyhydric alcohol and a polybasic acid.
In the composite material provided by the embodiment of the invention, naphthalene rings in a molecular chain of the naphthalene polyester have better rigidity, so that the composite material has better strength, better rigidity and higher heat resistance.
Meanwhile, naphthalene rings in the naphthalene-containing polyester are planar, so that the naphthalene-containing polyester has better gas barrier property, and the barrier property to water vapor is 3-4 times that of common polyester, therefore, the naphthalene-containing polyester can prevent amide groups (-NHCO-) in polyamide molecules from contacting with water in the air, and the water absorption performance of polyamide in the composite material can be effectively reduced. At the moment, the polyamide can keep better dimensional stability and better rigidity, so that the composite material can keep better stability and better rigidity, and further, the fixing frame obtained by injection molding of the composite material can keep better stability and better rigidity, and the phenomenon of bending deformation when the fixing frame is fixed on a cassette through mounting screws is prevented.
Meanwhile, the polyamide and the naphthalene-containing polyester have ester groups, so that the polyamide and the naphthalene-containing polyester in the composite material can generate ester-amide exchange reaction, and the crystallization rate of the composite material in the injection molding process can be inhibited. In this case, the crystals formed during injection molding of the composite material are small and uniform in size, so that the holder obtained by injection molding of the composite material can be prevented from warping.
And 8-20 parts of naphthalene-containing polyester, 33-45 parts of polyamide and the mass ratio of the polyamide to the naphthalene-containing polyester is (33-45): (8-20), therefore, the naphthalene ring in the naphthalene-containing polyester effectively prevents the polyamide in the composite material from contacting with air, and ensures that enough ester groups in the naphthalene-containing polyester and amide groups in the polyamide have ester-amide exchange reaction. And the toughness reduction of the composite material caused by more naphthalene-containing polyester in the composite material can be avoided.
As one possible implementation, the above-mentioned naphthalene-containing polyester may be selected according to the actual circumstances as long as the naphthalene-containing polyester has a naphthalene ring and an ester group. For example, the above naphthalene-containing polyesters include polyethylene naphthalate (abbreviated as PEN), polybutylene naphthalate (abbreviated as PBN), polytrimethylene naphthalate (abbreviated as PTN), copolymerized polybutylene naphthalate (PEN-copolymer), copolymerized polyethylene naphthalate (PEN-copolymer), copolymerized polytrimethylene naphthalate (PTN-copolymer), and copolyesters having a p-hydroxybenzoic acid structure/2-hydroxy-6-naphthalenedicarboxylic acid structure.
As an example, the compatibilizer may be selected according to actual conditions, so long as the compatibilizer can promote the polyamide and the naphthalene-containing polyester to be integrated by virtue of the bonding force between the polyamide molecules and the naphthalene-containing polyester molecules, so that a stable blend composite can be obtained. For example, the compatibilizer includes at least one of an epoxy resin and an ethylene-methyl acrylate-glycidyl methacrylate random terpolymer.
As a possible implementation, the polyamide includes polyhexamethylene adipamide (also known as nylon 66, Poly (hexamethylene adipamide, abbreviated as PA 66)) and polycaprolactam (also known as glass fiber reinforced polyamide-6, polycaprolactam mglas fiber reinforced, abbreviated as PA6, also known as nylon 6). it is understood that the relative viscosity of the polyhexamethylene adipamide (PA66) is 2.4-2.9 dL/g and the relative viscosity of the polycaprolactam (PA6) is 2.4-2.9 dL/g.
At the moment, the polyhexamethylene adipate (PA66) has good rigidity, and the polycaprolactam (PA6) has good impact resistance and good processability, so that the polyamide has good rigidity, good impact resistance and good processability simultaneously, the composite material has good rigidity, good impact resistance and good processability simultaneously, and the fixed frame made of the composite material is further prevented from bending deformation when being fixed on a cassette through mounting screws.
Specifically, the mass ratio of the polyhexamethylene adipamide (PA66) to the polycaprolactam (PA6) is (3-10): 1. in this case, the rigidity, impact resistance and processability of the polyamide can be further improved.
In one possible embodiment, the chopped glass fibers are alkali-free chopped glass fibers. It is to be understood that alkali-free chopped glass fibers refer to glass fibers having an alkali metal oxide content of less than 0.8% as described above. The alkali-free chopped glass fiber has better chemical stability and strength, and can further improve the strength and the chemical stability of the composite material.
The alkali-free chopped glass fibers are alkali-free chopped glass fibers treated with a surface modifier. At this time, the alkali-free chopped glass fiber treated by the surface modifier has good compatibility and matching property with the polyamide and the naphthalene-containing polyester, so that the glass fiber can be firmly attached to the polyamide and the naphthalene-containing polyester, and the strength, rigidity and chemical stability of the composite material can be further improved. In particular, the surface modifying agent may be a variety of different materials, such as: the surface modifier can be a silane coupling agent or a titanate coupling agent.
As an example, the section diameter of the chopped glass fiber is 7-12 μm, which can prevent the chopped glass fiber from being cut into powder or fiber with too small length during stirring process due to small diameter, so that the chopped glass fiber can have good reinforcing effect on polyamide and naphthalene-containing polyester. Meanwhile, poor adhesion among the chopped glass fibers, the polyamide and the naphthalene-containing polyester caused by over-thickness of the chopped glass fibers can be avoided, and the phenomenon of reduction of toughness and rigidity of the composite material can be prevented. From this result, it was found that the chopped glass fibers having a cross-sectional diameter of 7 to 12 μm can provide a good reinforcing effect to the polyamide and the naphthalene-containing polyester and also can provide good adhesion between the chopped glass fibers and the polyamide and the naphthalene-containing polyester.
The length of the chopped glass fiber is 2-9 mm, so that the chopped glass fiber has a good reinforcing effect on polyamide and naphthalene-containing polyester, and the appearance defect of floating fibers on the surface of the composite material caused by long chopped glass fiber can be prevented.
As one possible implementation manner, the composite material further comprises a processing aid, wherein the processing aid comprises at least one of 0.5-5 parts of toughening agent, 10-15 parts of flame retardant, 0.2-0.3 part of antioxidant, 0.2-0.8 part of lubricant and 0.1-0.4 part of ester exchange inhibitor.
At the moment, the flexibilizer can enhance the flexibility of the polyamide and the naphthalene-containing polyester, and further can prevent the phenomenon of cracking and bending deformation when the fixing frame made of the composite material is fixed on the cassette through the mounting screws. Specifically, the selection range of the toughening agent is wide, such as at least one of maleic anhydride grafted ethylene propylene diene monomer rubber and maleic anhydride grafted ethylene-1-octene copolymer.
The flame retardant can improve the flame retardant property of the composite material, so that the flame retardant property of the fixing frame made of the composite material is improved, and the safety performance of the wall switch with the fixing frame in use is ensured. Illustratively, the flame retardant may be selected from a variety of flame retardants, so long as the flame retardant imparts flame retardant properties to the composite. For example, the flame retardant is a combination of brominated styrene and an antimony compound.
Specifically, in the compound of brominated styrene and an antimony compound, the mass ratio of the brominated styrene to the antimony compound is (2.5-3.5): 1, the flame retardant has higher flame retardant efficiency, and the preparation cost of the composite material can be reduced.
Specifically, the bromine content in the brominated styrene is 64-70%, and the flame retardant efficiency of the flame retardant can be further improved.
The antimony compound includes at least one of antimony trioxide and anhydrous sodium antimonate.
The antioxidant can prevent the polyamide and the naphthalene-containing polyester from aging caused by the oxidation reaction of the polyamide and the naphthalene-containing polyester, and ensure that the polyamide and the naphthalene-containing polyester can keep better rigidity. The antioxidant may be selected from a wide range, and for example, the antioxidant may be at least one of antioxidant 703(T521) and BHT antioxidant.
The lubricant can reduce the sliding friction among the polyamide, the naphthalene-containing polyester and the chopped glass fibers, so that the polyamide, the naphthalene-containing polyester and the chopped glass fibers in the composite material can be uniformly dispersed. Specifically, the lubricant may be at least one of silicone oil, fatty acid amide, oleic acid, polyester, synthetic ester, and carboxylic acid.
The ester exchange inhibitor can control the reaction rate of the ester-amide exchange reaction between the polyamide and the naphthalene-containing polyester to a proper reaction degree, and further can control the size of crystals in the injection molding process of the composite material. Specifically, the transesterification inhibitor may be sodium hydrogen phosphate.
Embodiment two
The invention also provides a preparation method of the composite material. Referring to fig. 2, the preparation method of the composite material includes:
s100: preparing a uniformly mixed material:
mixing 33-45 parts by mass of polyamide, 8-20 parts by mass of naphthalene-containing polyester and 0.5-3 parts by mass of a compatilizer to obtain a uniformly mixed material. It will be appreciated that in order to ensure a uniform distribution of the polyamide and the naphthalene containing polyester in the composite, the polyamide, the naphthalene containing polyester and the compatibilizer should be mixed as uniformly as possible.
S200: preparing a composite material: and melting and blending the uniformly mixed material and the chopped glass fiber to obtain the composite material.
Compared with the prior art, the preparation method of the composite material provided by the invention has the same beneficial effects as the composite material, and is not repeated herein.
As a possible implementation manner, the step S100: the preparation of the uniformly mixed material specifically comprises the following steps:
mixing a processing aid with 33-45 parts by mass of polyamide, 8-20 parts by mass of naphthalene-containing polyester and 0.5-3 parts by mass of a compatilizer to obtain a uniformly mixed material;
wherein the processing aid comprises at least one of 0.5-5 parts by mass of a toughening agent, 10-15 parts by mass of a flame retardant, 0.2-0.3 part by mass of an antioxidant, 0.2-0.8 part by mass of a lubricant and 0.1-0.4 part by mass of a transesterification inhibitor.
Illustratively, S100, when preparing the mixed material, the mixing equipment is a high-speed mixer, the rotating speed of the high-speed mixer is 2500 r/min-3500 r/min, and the mixing time is 3 min-5 min.
Specifically, in the step S200, when the composite material is prepared, the used equipment is a double-screw extruder, the temperature of the first zone of the double-screw extruder is 280-285 ℃, the temperature of the second zone is 280-285 ℃, the temperature of the third zone is 280-285 ℃, the temperature of the fourth zone is 270-275 ℃, the temperature of the fifth zone is 270-275 ℃, the temperature of the sixth zone is 270-275 ℃, the temperature of the seventh zone is 270-275 ℃, the temperature of the eighth zone is 270-275 ℃, the temperature of the ninth zone is 275-280 ℃, the temperature of the machine head is 285-290 ℃, and the rotating speed of the double-screw extruder is 300-500 r/min.
It should be noted that when the chopped glass fibers and the blending material are melted and blended, the composite material is added into a hopper of a double-screw extruder, and the chopped glass fibers are added into a side feeding hopper of the double-screw extruder, so that the blending material is melted first and then melted and blended with the chopped glass fibers. At the moment, the chopped glass fiber, the polyamide and the naphthalene-containing polyester in the composite material can be uniformly distributed, and the chopped glass fiber can be prevented from being cut into powder or limited by too short length due to too long melt blending time, so that the chopped glass fiber has a good reinforcing effect on the polyamide and the naphthalene-containing polyester.
The above-described scheme is further illustrated below using examples and comparative examples, and the mass fractions of the respective raw materials in the following examples one to six and comparative examples one to three are shown in table 1.
Example one
The embodiment of the invention provides a preparation method of a composite material, which specifically comprises the following steps:
the first step is as follows: preparing a uniformly mixed material:
weighing 45 parts by mass of polyamide, 8 parts by mass of naphthalene-containing polyester, 1 part by mass of compatilizer, 2 parts by mass of toughening agent, 13 parts by mass of flame retardant, 0.2 part by mass of antioxidant, 0.2 part by mass of lubricant and 0.1 part by mass of ester exchange inhibitor, putting the weighed materials into a high-speed mixer, and mixing for 4min at the rotating speed of 3500r/min to obtain a uniformly mixed material.
The second step is that: weighing 30 parts by mass of chopped glass fibers, adding a uniformly mixed material into a main hopper of a double-screw extruder, adding the chopped glass fibers into a side hopper of the double-screw extruder, setting the first-zone temperature of the double-screw extruder to be 280 ℃, the second-zone temperature to be 280 ℃, the third-zone temperature to be 280 ℃, the fourth-zone temperature to be 275 ℃, the fifth-zone temperature to be 272 ℃, the sixth-zone temperature to be 272 ℃, the seventh-zone temperature to be 270 ℃, the eighth-zone temperature to be 270 ℃, the ninth-zone temperature to be 275 ℃, the head temperature to be 290 ℃ and the rotating speed of the double-screw extruder to be 400r/min, melting and blending the uniformly mixed material and the chopped glass fibers, and then extruding and granulating to obtain the composite material.
Example two
The embodiment of the invention provides a preparation method of a composite material, which specifically comprises the following steps:
the first step is as follows: preparing a uniformly mixed material:
weighing 38 parts by mass of polyamide, 15 parts by mass of naphthalene-containing polyester, 1 part by mass of compatilizer, 2 parts by mass of toughening agent, 13 parts by mass of flame retardant, 0.2 part by mass of antioxidant, 0.2 part by mass of lubricant and 0.1 part by mass of ester exchange inhibitor, putting the weighed materials into a high-speed mixer, and mixing for 4min at the rotating speed of 3500r/min to obtain a uniformly mixed material.
The second step is that: weighing 30 parts by mass of chopped glass fibers, adding a uniformly mixed material into a main hopper of a double-screw extruder, adding the chopped glass fibers into a side hopper of the double-screw extruder, setting the first-zone temperature of the double-screw extruder to be 280 ℃, the second-zone temperature to be 280 ℃, the third-zone temperature to be 280 ℃, the fourth-zone temperature to be 275 ℃, the fifth-zone temperature to be 272 ℃, the sixth-zone temperature to be 272 ℃, the seventh-zone temperature to be 270 ℃, the eighth-zone temperature to be 270 ℃, the ninth-zone temperature to be 275 ℃, the head temperature to be 290 ℃ and the rotating speed of the double-screw extruder to be 400r/min, melting and blending the uniformly mixed material and the chopped glass fibers, and then extruding and granulating to obtain the composite material.
EXAMPLE III
The embodiment of the invention provides a preparation method of a composite material, which specifically comprises the following steps:
the first step is as follows: preparing a uniformly mixed material:
weighing 33 parts by mass of polyamide, 20 parts by mass of naphthalene-containing polyester, 1 part by mass of compatilizer, 2 parts by mass of toughening agent, 13 parts by mass of flame retardant, 0.2 part by mass of antioxidant, 0.2 part by mass of lubricant and 0.1 part by mass of ester exchange inhibitor, putting the weighed materials into a high-speed mixer, and mixing for 4min at the rotating speed of 3500r/min to obtain a uniformly mixed material.
The second step is that: weighing 30 parts by mass of chopped glass fibers, adding a uniformly mixed material into a main hopper of a double-screw extruder, adding the chopped glass fibers into a side hopper of the double-screw extruder, setting the first-zone temperature of the double-screw extruder to be 280 ℃, the second-zone temperature to be 280 ℃, the third-zone temperature to be 280 ℃, the fourth-zone temperature to be 275 ℃, the fifth-zone temperature to be 272 ℃, the sixth-zone temperature to be 272 ℃, the seventh-zone temperature to be 270 ℃, the eighth-zone temperature to be 270 ℃, the ninth-zone temperature to be 275 ℃, the head temperature to be 290 ℃ and the rotating speed of the double-screw extruder to be 400r/min, melting and blending the uniformly mixed material and the chopped glass fibers, and then extruding and granulating to obtain the composite material.
The raw materials used in the first to third embodiments are as follows:
the polyamide is compounded by PA66 and PA6 according to the mass ratio of 5: 1. PA66 was polyhexamethylene adipate with a relative viscosity of 2.7dL/g, produced by the Amur group and having the model EPR 27. PA6 is polycaprolactam with a relative viscosity of 2.7dL/g, available from Haiyang technologies Inc. under the model number HY 2700.
The naphthalene polyester was polyethylene naphthalate (PEN), having an intrinsic viscosity of 0.68dL/g, manufactured by Ditam Kabushiki Kaisha, model No. TN 8065S.
The chopped glass fiber is alkali-free chopped glass fiber with the surface treated by silane coupling agent, the diameter of the fiber is 10 mu m, the length of the fiber is 5mm, and the model is ECS10-03-568H, which is produced by Zhejiang boulder group company.
The compatilizer is bisphenol A type epoxy resin, is produced by Yueyang petrochemical industry and has the brand number of CYD-011.
The toughening agent is maleic anhydride grafted ethylene-1-octene copolymer (POE-g-MAH) which is produced by Mitsui chemical company of Japan and has the model number of MD 715.
The flame retardant is brominated polystyrene and an antimony compound, and the weight ratio of the brominated polystyrene to the antimony compound is 3:1 proportion, wherein the brominated polystyrene bromine content is 68 percent, and the brominated polystyrene bromine is produced by Shandong brother science and technology company Limited and has the model of XZ-6800; the antimony compound is antimony trioxide with purity of 99.9%, and is produced by Limited liability company of antimony flashing industry in tin mines.
The antioxidant is antioxidant 703(T521), and the product number of Nanjing Pasteur chemical Co., Ltd is 88-27-7.
The lubricant is dimethyl silicone oil, and is produced by Guangzhou Orthode chemical engineering Co.
The ester exchange inhibitor is PS-820, produced by Shanghai Kaishan chemical Co., Ltd.
Example four
The embodiment of the invention provides a preparation method of a composite material, which specifically comprises the following steps:
the first step is as follows: preparing a uniformly mixed material:
weighing 36 parts by mass of polyamide, 10 parts by mass of naphthalene-containing polyester, 0.5 part by mass of compatilizer, 0.5 part by mass of toughener, 10 parts by mass of flame retardant, 0.3 part by mass of antioxidant, 0.8 part by mass of lubricant and 0.4 part by mass of ester exchange inhibitor, putting the weighed materials into a high-speed mixer, and mixing for 4min at the rotating speed of 3500r/min to obtain a uniformly mixed material.
Wherein the polyamide is compounded by PA66 and PA6 according to the mass ratio of 3: 1. PA66 is polyhexamethylene adipate with a relative viscosity of 2.4dL/g, produced by the Ama group. PA6 is polycaprolactam with a relative viscosity of 2.4dL/g, manufactured by Haiyang technologies, Inc.
The naphthalene polyester is polybutylene naphthalate.
The compatilizer is ethylene-methyl acrylate-glycidyl methacrylate random terpolymer produced by Achima of France and has the mark of 16MA 003.
The toughening agent is maleic anhydride grafted ethylene propylene diene monomer (EPDM-g-MAH) produced by Nanjing polymer materials Co.
The flame retardant is brominated polystyrene and an antimony compound, and the weight ratio of the brominated polystyrene to the antimony compound is 2.5: 1 proportion of 64 percent of brominated polystyrene bromine, produced by Shandong brother science and technology corporation; the antimony compound is anhydrous sodium antimonate, and is produced by Limited liability company of antimony flashing industry of tin mines.
The antioxidant is BHT antioxidant, produced by DuPont, USA under the trade name of 4355.
The lubricant is fatty acid amide KR-550, manufactured by Korea industrial materials Co.
The ester exchange inhibitor is CX-1, and is produced by Shanghai remote chemical industry Co.
The second step is that: weighing 20 parts by mass of chopped glass fibers, adding a uniformly mixed material into a main hopper of a double-screw extruder, adding the chopped glass fibers into a side hopper of the double-screw extruder, setting the first-zone temperature of the double-screw extruder to be 285 ℃, the second-zone temperature to be 285 ℃, the third-zone temperature to be 285 ℃, the fourth-zone temperature to be 270 ℃, the fifth-zone temperature to be 270 ℃, the sixth-zone temperature to be 270 ℃, the seventh-zone temperature to be 275 ℃, the eighth-zone temperature to be 275 ℃, the ninth-zone temperature to be 280 ℃, the head temperature to be 85 ℃ and the rotating speed of the double-screw extruder to be 300r/min, melting and blending the uniformly mixed material and the chopped glass fibers, and then extruding and granulating to obtain the composite material.
Wherein the chopped glass fiber is alkali-free chopped glass fiber with surface treated by silane coupling agent, the diameter of the fiber is 8 μm, the length is 2mm, and the chopped glass fiber is produced by Zhejiang boulder group company.
EXAMPLE five
The embodiment of the invention provides a preparation method of a composite material, which specifically comprises the following steps:
the first step is as follows: preparing a uniformly mixed material:
weighing 42 parts by mass of polyamide, 18 parts by mass of naphthalene-containing polyester, 3 parts by mass of compatilizer, 5 parts by mass of toughener, 15 parts by mass of flame retardant, 0.2 part by mass of antioxidant, 0.4 part by mass of lubricant and 0.2 part by mass of ester exchange inhibitor, putting the weighed materials into a high-speed mixer, and mixing for 4min at the rotating speed of 3500r/min to obtain a uniformly mixed material.
Wherein the polyamide is compounded by PA66 and PA66 according to the mass ratio of 10: 1. PA66 is polyhexamethylene adipate with a relative viscosity of 2.9dL/g, produced by the Ama group. PA6 is polycaprolactam with a relative viscosity of 2.9dL/g, manufactured by Haiyang technologies, Inc.
The naphthalene polyester is polybutylene naphthalate.
The compatilizer is ethylene-methyl acrylate-glycidyl methacrylate random terpolymer produced by Achima of France and has the mark of 16MA 003.
The toughening agent is maleic anhydride grafted ethylene propylene diene monomer (EPDM-g-MAH) produced by Nanjing polymer materials Co.
The flame retardant is brominated polystyrene and an antimony compound, and the weight ratio of the brominated polystyrene to the antimony compound is 3.5: 1 proportion, wherein the brominated polystyrene bromine content is 70 percent, and is produced by Shandong brother science and technology Co., Ltd; the antimony compound is anhydrous sodium antimonate, and is produced by Limited liability company of antimony flashing industry of tin mines.
The antioxidant is BHT antioxidant, produced by DuPont, USA under the trade name of 4355.
The lubricant is fatty acid amide KR-550, manufactured by Korea industrial materials Co.
The ester exchange inhibitor is CX-1, and is produced by Shanghai remote chemical industry Co.
The second step is that: weighing 35 parts by mass of chopped glass fibers, adding a uniformly mixed material into a main hopper of a double-screw extruder, adding the chopped glass fibers into a side hopper of the double-screw extruder, setting the first-zone temperature of the double-screw extruder to be 285 ℃, the second-zone temperature to be 285 ℃, the third-zone temperature to be 285 ℃, the fourth-zone temperature to be 270 ℃, the fifth-zone temperature to be 270 ℃, the sixth-zone temperature to be 270 ℃, the seventh-zone temperature to be 275 ℃, the eighth-zone temperature to be 275 ℃, the ninth-zone temperature to be 280 ℃, the head temperature to be 85 ℃ and the rotating speed of the double-screw extruder to be 300r/min, melting and blending the uniformly mixed material and the chopped glass fibers, and then extruding and granulating to obtain the composite material.
The chopped glass fiber is alkali-free chopped glass fiber with the surface treated by silane coupling agent, the diameter of the fiber is 10 mu m, the diameter of the fiber is 9mm, and the chopped glass fiber is produced by Zhejiang boulder group company.
EXAMPLE six
The embodiment of the invention provides a preparation method of a composite material, which specifically comprises the following steps:
the first step is as follows: preparing a uniformly mixed material:
weighing 33 parts by mass of polyamide, 20 parts by mass of naphthalene-containing polyester, 2 parts by mass of compatilizer, 3 parts by mass of toughening agent, 11 parts by mass of flame retardant, 0.3 part by mass of antioxidant, 0.6 part by mass of lubricant and 0.3 part by mass of ester exchange inhibitor, putting the weighed materials into a high-speed mixer, and mixing for 4min at the rotating speed of 3500r/min to obtain a uniformly mixed material.
Wherein the polyamide is compounded by PA66 and PA6 according to the mass ratio of 10: 1. PA66 is polyhexamethylene adipate with a relative viscosity of 2.9dL/g, produced by the Ama group. PA6 is polycaprolactam with a relative viscosity of 2.9dL/g, manufactured by Haiyang technologies, Inc.
The naphthalene polyester is polybutylene naphthalate.
The compatilizer is ethylene-methyl acrylate-glycidyl methacrylate random terpolymer produced by Achima of France and has the mark of 16MA 003.
The toughening agent is maleic anhydride grafted ethylene propylene diene monomer (EPDM-g-MAH) produced by Nanjing polymer materials Co.
The flame retardant is brominated polystyrene and an antimony compound, and the weight ratio of the brominated polystyrene to the antimony compound is 3.5: 1 proportion, wherein the brominated polystyrene bromine content is 70 percent, and is produced by Shandong brother science and technology Co., Ltd; the antimony compound is anhydrous sodium antimonate, and is produced by Limited liability company of antimony flashing industry of tin mines.
The antioxidant is BHT antioxidant, produced by DuPont, USA under the trade name of 4355.
The lubricant is fatty acid amide KR-550, manufactured by Korea industrial materials Co.
The ester exchange inhibitor is CX-1, and is produced by Shanghai remote chemical industry Co.
The second step is that: weighing 25 parts by mass of chopped glass fibers, adding a uniformly mixed material into a main hopper of a double-screw extruder, adding the chopped glass fibers into a side hopper of the double-screw extruder, setting the first-zone temperature of the double-screw extruder to be 283 ℃, the second-zone temperature to be 283 ℃, the third-zone temperature to be 283 ℃, the fourth-zone temperature to be 273 ℃, the fifth-zone temperature to be 273 ℃, the sixth-zone temperature to be 273 ℃, the seventh-zone temperature to be 273 ℃, the eighth-zone temperature to be 273 ℃, the ninth-zone temperature to be 278 ℃, the head temperature to be 287 ℃, and the rotating speed of the double-screw extruder to be 400r/min, melting and blending the uniformly mixed material and the chopped glass fibers, and then extruding and granulating to obtain the composite material.
The chopped glass fiber is alkali-free chopped glass fiber with the surface treated by silane coupling agent, the diameter of the fiber is 12 μm, the diameter is 6mm, and the chopped glass fiber is produced by Zhejiang boulder group company.
Comparative example 1
The embodiment of the invention provides a preparation method of a composite material, which specifically comprises the following steps:
the first step is as follows: preparing a uniformly mixed material:
weighing 53 parts by mass of polyamide, 1 part by mass of compatilizer, 2 parts by mass of toughener, 13 parts by mass of flame retardant, 0.2 part by mass of antioxidant, 0.2 part by mass of lubricant and 0.1 part by mass of ester exchange inhibitor, putting the weighed materials into a high-speed mixer, and mixing for 4min at the rotating speed of 3500r/min to obtain a uniformly mixed material.
The second step is that: weighing 30 parts by mass of chopped glass fibers, adding a uniformly mixed material into a main hopper of a double-screw extruder, adding the chopped glass fibers into a side hopper of the double-screw extruder, setting the first-zone temperature of the double-screw extruder to be 280 ℃, the second-zone temperature to be 280 ℃, the third-zone temperature to be 280 ℃, the fourth-zone temperature to be 275 ℃, the fifth-zone temperature to be 272 ℃, the sixth-zone temperature to be 272 ℃, the seventh-zone temperature to be 270 ℃, the eighth-zone temperature to be 270 ℃, the ninth-zone temperature to be 275 ℃, the head temperature to be 290 ℃ and the rotating speed of the double-screw extruder to be 400r/min, melting and blending the uniformly mixed material and the chopped glass fibers, and then extruding and granulating to obtain the composite material.
Comparative example No. two
The embodiment of the invention provides a preparation method of a composite material, which specifically comprises the following steps:
the first step is as follows: preparing a uniformly mixed material:
weighing 28 parts by mass of polyamide, 25 parts by mass of naphthalene-containing polyester, 1 part by mass of compatilizer, 2 parts by mass of toughening agent, 13 parts by mass of flame retardant, 0.2 part by mass of antioxidant, 0.2 part by mass of lubricant and 0.1 part by mass of ester exchange inhibitor, putting the weighed materials into a high-speed mixer, and mixing for 4min at the rotating speed of 3500r/min to obtain a uniformly mixed material.
The second step is that: weighing 30 parts by mass of chopped glass fibers, adding a uniformly mixed material into a main hopper of a double-screw extruder, adding the chopped glass fibers into a side hopper of the double-screw extruder, setting the first-zone temperature of the double-screw extruder to be 280 ℃, the second-zone temperature to be 280 ℃, the third-zone temperature to be 280 ℃, the fourth-zone temperature to be 275 ℃, the fifth-zone temperature to be 272 ℃, the sixth-zone temperature to be 272 ℃, the seventh-zone temperature to be 270 ℃, the eighth-zone temperature to be 270 ℃, the ninth-zone temperature to be 275 ℃, the head temperature to be 290 ℃ and the rotating speed of the double-screw extruder to be 400r/min, melting and blending the uniformly mixed material and the chopped glass fibers, and then extruding and granulating to obtain the composite material.
Comparative example 3
The embodiment of the invention provides a preparation method of a composite material, which specifically comprises the following steps:
the first step is as follows: preparing a uniformly mixed material:
weighing 38 parts by mass of polyamide, 15 parts by mass of common polyester, 1 part by mass of compatilizer, 2 parts by mass of toughener, 13 parts by mass of flame retardant, 0.2 part by mass of antioxidant, 0.2 part by mass of lubricant and 0.1 part by mass of ester exchange inhibitor, putting the weighed materials into a high-speed mixer, and mixing for 4min at the rotating speed of 3500r/min to obtain a uniformly mixed material.
The second step is that: weighing 30 parts by mass of chopped glass fibers, adding a uniformly mixed material into a main hopper of a double-screw extruder, adding the chopped glass fibers into a side hopper of the double-screw extruder, setting the first-zone temperature of the double-screw extruder to be 280 ℃, the second-zone temperature to be 280 ℃, the third-zone temperature to be 280 ℃, the fourth-zone temperature to be 275 ℃, the fifth-zone temperature to be 272 ℃, the sixth-zone temperature to be 272 ℃, the seventh-zone temperature to be 270 ℃, the eighth-zone temperature to be 270 ℃, the ninth-zone temperature to be 275 ℃, the head temperature to be 290 ℃ and the rotating speed of the double-screw extruder to be 400r/min, melting and blending the uniformly mixed material and the chopped glass fibers, and then extruding and granulating to obtain the composite material.
The types of the raw materials adopted in the comparative examples 1 to 3 are the same as those adopted in the examples 1 to 3, the common polyester adopted in the comparative example 6 is polyethylene terephthalate (PET), the intrinsic viscosity is 0.88dL/g, and the type is BG85, which is produced by chemical fiber characterization Limited.
TABLE 1 quality fraction table of raw materials
The composite materials of examples one to six and comparative examples one to three were respectively injection-molded to form a sample plate or a bar for physical property testing, and the test results are shown in table 2.
Wherein, the physical property test comprises the following steps:
tensile strength (Mpa) test: the test conditions were 50mm/min according to the GB/T1040 test.
Flexural strength (Mpa) test: the test conditions were 2mm/min according to GB/T9341 test.
Flexural modulus (Mpa) test: the test conditions were 2mm/min according to GB/T9341 test.
Notched Izod impact Strength (KJ/m)2) And (3) testing: the test conditions were 23 ℃ according to the GB/T1843 test.
Heat distortion temperature (. degree. C.) test: the test conditions were 120 ℃/h according to the GB/T1634 test.
Glow wire (GWFI/. degree.C.) test: tested according to GB/T169915.
Water absorption (%) test: according to the IS 062 test, the test conditions were a 24h immersion in water at 23 ℃.
Bending modulus loss (%) test: flexural modulus at initial state of E0When the bending modulus E is obtained after 24 hours of soaking, the bending modulus loss rate is (1-E/E)0)×100％。
Meanwhile, the plastic particles prepared in the first to sixth examples and the first to third comparative examples were respectively injection-molded into a fixing frame product, and a torsion test and a warpage performance evaluation were performed, and the test results are shown in table 2.
The specific operation method of the torsion test and the warpage evaluation is as follows:
and (3) torsion testing: the two ends of the fixing frame are fixed, the middle position is suspended, 1.2N.m of screw torque is applied to the middle position of the fixing frame, and the deformation (mm) in the suspended state is measured.
Evaluation of warpage: the fixing frame product is placed on a flat desktop, one end of the fixing frame product is pressed, and the height of the other end of the fixing frame product, which is the warping degree (mm), leaving the flat desktop is tested.
Table 2 composite physical property test results
Referring to table 2, the glow wire temperature of the composite materials obtained in the first to second examples 7 and the first to second comparative examples 7 is greater than 850 ℃, which illustrates that the composite materials provided in the first to second examples seven and the first to second comparative examples seven of the present invention all meet the requirement of flame retardant property of wall switches.
As can be seen from Table 1, the composites of examples one-seventh all had naphthalene containing polyesters, whereas the comparative example had no naphthalene containing polyester added. Meanwhile, referring to table 2, the tensile strength, flexural modulus, heat distortion temperature and flexural modulus loss rate of examples one to 7 are superior to those of comparative example one, which shows that the rigidity of the composite material can be improved by adding the naphthalene-containing polyester.
Also, referring to table 1, the difference between the first to third examples and the first comparative example is that the three polymer polymers of the first to third examples are polyamide and naphthalene-containing polyester, while the polymer of the first comparative example is only polyamide.
As can be seen from Table 2, the flexural modulus of the composite materials obtained in examples one to three was 8600MPa to 9530MPa, while that of the composite material obtained in comparative example one was 7800. Meanwhile, the composite materials obtained in the first to third examples have the deformation amount of 0.8mm to 1.0mm under the torsion of 1.2N.m, the composite material obtained in the first comparative example has the deformation amount of 1.8mm, and the rigidity of the composite materials obtained in the first to third examples is obviously higher than that of the composite material obtained in the first comparative example, so that the rigidity of the composite materials can be obviously increased by the naphthalene-containing polyester in the composite materials.
The heat distortion temperature of the composite materials obtained in the first to third examples is 242-255 ℃, while the heat distortion temperature of the composite material in the first comparative example is 235 ℃, and the heat resistance of the composite materials obtained in the first to third examples of the invention is superior to that of the composite material in the first comparative example, so that the naphthalene-containing polyester in the composite materials can obviously increase the heat resistance of the composite materials.
The water absorption rate of the composite material obtained in the first to third examples is 0.36-0.48, and the bending modulus loss rate is 7.1-9.5%, while the water absorption rate of the composite material obtained in the first comparative example is 0.78, and the bending modulus loss rate is 15.2%, which can show that the naphthalene-containing polyester can obviously reduce the water absorption rate of the composite material, and the composite material can maintain good rigidity.
The warpage of the composite material obtained in the first to third embodiments is 0.3mm to 0.5mm, which meets the assembly requirement of the fixing frame product, while the warpage of the composite material obtained in the comparison document 1 is 1.5mm, which is very obvious in warpage and seriously affects the assembly of the fixing frame product. Therefore, the naphthalene polyester can obviously reduce the warpage of the composite material.
Referring to table 1, examples one to three differ from comparative example 2 only in that:
the mass fraction of the naphthalene-containing polyester in the high-molecular polymer of example two is smaller than that of the naphthalene-containing polyester in the high-molecular polymer of comparative example two. Referring to Table 2, the notched impact strengths of the composites obtained in examples one to three were 9.5KJ/m2The deformation amount is 0.8mm to 1.0mm under the torsion of 1.2 N.m. The composite material obtained in comparative example 2 has a notched impact strength of 8.2 and cracks under a torsion of 1.2N.m, and it can be seen that the mass ratio of polyamide to naphthalene-containing polyester should be (33 to 45): (8-20).
Referring to table 1, example two differs from comparative example 3 only in that 15 parts by mass of the naphthalene-containing polyester was added to example two and 15 parts by mass of the general polyester was added to comparative example three. Referring to table 2, the composite material obtained in example 2 has a lower tensile strength, flexural modulus and deformation at a torsion of 1.2n.m than those of the composite material obtained in comparative example, and thus the naphthalene-containing polyester can enhance the rigidity of the composite material.
Embodiment three
The invention also provides a fixing frame. The fixing frame is made of the composite material or the composite material prepared by the preparation method of the composite material.
Compared with the prior art, the beneficial effects of the fixing frame provided by the invention are the same as those of the composite material, and are not described herein again.
Embodiment four
The invention also provides a wall switch. The wall switch comprises the fixing frame.
Compared with the prior art, the wall switch provided by the invention has the same beneficial effects as the fixing frame, and the details are not repeated herein.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The composite material is characterized by comprising the following components in parts by mass:
33 to 45 portions of polyamide, 8 to 20 portions of naphthalene polyester, 20 to 35 portions of chopped glass fiber and 0.5 to 3 portions of compatilizer.
2. The composite material according to claim 1, wherein the naphthalene-containing polyester comprises at least one of polyethylene naphthalate, polybutylene naphthalate, polypropylene naphthalate, copolymerized polybutylene naphthalate, copolymerized polyethylene naphthalate, copolymerized polypropylene naphthalate, and a copolyester with p-hydroxybenzoic acid/2-hydroxy-6-naphthalenedicarboxylic acid; and/or the presence of a gas in the gas,
the compatilizer comprises at least one of epoxy resin and ethylene-methyl acrylate-glycidyl methacrylate random terpolymer; and/or the presence of a gas in the gas,
the polyamide is a compound of polyhexamethylene diamine adipate and polycaprolactam; and the mass ratio of the polyhexamethylene adipamide to the polycaprolactam is (3-10): 1.
3. the composite material of claim 1, wherein the chopped glass fibers have a cross-sectional diameter of 7 to 12 μ ι η; and/or the presence of a gas in the gas,
the length of the chopped glass fiber is 2 mm-9 mm.
4. The composite material of any of claims 1-3, further comprising a processing aid comprising at least one of 0.5-5 parts of a toughening agent, 10-15 parts of a flame retardant, 0.2-0.3 parts of an antioxidant, 0.2-0.8 parts of a lubricant, and 0.1-0.4 parts of a transesterification inhibitor.
5. The composite material of claim 4, wherein the flame retardant is a compound of brominated styrene and an antimony compound; the mass ratio of the brominated styrene to the antimony compound is (2.5-3.5): 1; and/or the presence of a gas in the gas,
the bromine content in the brominated styrene is 64-70%; and/or the presence of a gas in the gas,
the antimony compound includes at least one of antimony trioxide and anhydrous sodium antimonate.
6. A method of making a composite material, comprising:
preparing a uniformly mixed material: mixing 33-45 parts by mass of polyamide, 8-20 parts by mass of naphthalene-containing polyester and 0.5-3 parts by mass of a compatilizer to obtain a uniformly mixed material;
preparing a composite material: and melting and blending the uniformly mixed material and 20-35 parts by mass of chopped glass fibers to obtain the composite material.
7. The preparation method of the composite material according to claim 6, wherein the preparation of the uniformly mixed material specifically comprises:
mixing a processing aid with 33-45 parts by mass of polyamide, 8-20 parts by mass of naphthalene-containing polyester and 0.5-3 parts by mass of a compatilizer to obtain a uniformly mixed material;
wherein the processing aid comprises at least one of 0.5-5 parts by mass of a toughening agent, 10-15 parts by mass of a flame retardant, 0.2-0.3 part by mass of an antioxidant, 0.2-0.8 part by mass of a lubricant and 0.1-0.4 part by mass of a transesterification inhibitor.
8. The preparation method of the composite material according to claim 7, wherein the mixing equipment used in the preparation of the mixed material is a high-speed mixer, the rotating speed of the high-speed mixer is 2500r/min to 3500r/min, and the mixing time is 3min to 5 min; and/or the presence of a gas in the gas,
when the composite material is prepared, the used melt blending equipment is a double-screw extruder, the temperature of a first zone of the double-screw extruder is 280-285 ℃, the temperature of a second zone of the double-screw extruder is 280-285 ℃, the temperature of a third zone of the double-screw extruder is 280-285 ℃, the temperature of a fourth zone of the double-screw extruder is 270-275 ℃, the temperature of a fifth zone of the double-screw extruder is 270-275 ℃, the temperature of a sixth zone of the double-screw extruder is 270-275 ℃, the temperature of a seventh zone of the double-screw extruder is 270-275 ℃, the temperature of an eighth zone of the double-screw extruder is 275-280 ℃, the temperature of a machine head of the double-screw extruder.
9. A fixing frame, characterized in that the fixing frame is made of the composite material as claimed in any one of claims 1 to 5 or the composite material prepared by the preparation method of the composite material as claimed in any one of claims 6 to 8.
10. A wall switch comprising the holder of claim 9.
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