CN116200016A - Glass fiber reinforced polyester material capable of being welded by laser and preparation method thereof - Google Patents

Glass fiber reinforced polyester material capable of being welded by laser and preparation method thereof Download PDF

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Publication number
CN116200016A
CN116200016A CN202310256079.3A CN202310256079A CN116200016A CN 116200016 A CN116200016 A CN 116200016A CN 202310256079 A CN202310256079 A CN 202310256079A CN 116200016 A CN116200016 A CN 116200016A
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glass fiber
laser
fiber reinforced
reinforced polyester
antioxidant
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徐祥
钱家文
孟祥宇
莫磊
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Suzhou Sunway Polymer Co ltd
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Suzhou Sunway Polymer Co ltd
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    • 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
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
    • C08J5/08—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials glass fibres
    • 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
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2433/10—Homopolymers or copolymers of methacrylic acid esters
    • C08J2433/12—Homopolymers or copolymers of methyl methacrylate
    • 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
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/14—Glass
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention belongs to the technical field of polyester materials, and particularly relates to a glass fiber reinforced polyester material capable of being welded by laser and a preparation method thereof. The material comprises the following components in parts by weight: 39-70 parts of thermoplastic polyester, 10-31 parts of PMMA, 10-30 parts of glass fiber, 0.1-0.4 part of antioxidant and 0.1-0.2 part of transesterification inhibitor. The preparation method comprises the following steps: weighing thermoplastic polyester, PMMA, glass fiber, an antioxidant and a transesterification inhibitor according to parts by weight; putting thermoplastic polyester, PMMA, an antioxidant and a transesterification inhibitor into a high-speed mixer, and mixing to obtain a premix; adding the premix into a double-screw extruder, adding the glass fiber into the double-screw extruder, and carrying out melt extrusion to obtain a molten material; and bracing, cooling and granulating the molten material to obtain the glass fiber reinforced polyester material. The glass fiber reinforced polyester material prepared by the invention has better strength, high laser transmittance and difficult burn by laser.

Description

Glass fiber reinforced polyester material capable of being welded by laser and preparation method thereof
Technical Field
The invention belongs to the technical field of polyester materials, and particularly relates to a glass fiber reinforced polyester material capable of being welded by laser and a preparation method thereof.
Background
Plastic is a renewable nonmetallic material with excellent performance, is used as a second largest material system next to metal, has huge application in industries such as automobiles, aerospace, transportation, medical treatment, electronic products and the like, and has particularly strong demand for light weight.
The plastic-steel ratio is the ratio of the quantity of plastic and steel produced in one country, is one of important standards for measuring the development degree of the country, and has wide development prospect in developed countries. With the continuous replacement of metal by plastic, the connection value between plastic parts is generally maintained at about 65:35, but the plastic-steel ratio in China is only 30:70, and the plastic-steel ratio has a huge gap with developed countries, and meanwhile, the plastic-steel ratio also has higher requirements on technology and quality.
Plastic welding is the most effective method for achieving permanent joining of plastic parts, and conventional plastic welding processes include ultrasonic welding, vibration friction welding, hot plate welding, and the like. Ultrasonic welding is fast, but welding length is limited, flash and fragments are easy to generate, and large mechanical stress exists in parts. Vibration friction welding can be used for welding large-size parts, but a large amount of extruded resin cannot be used for welding parts with complex interface shapes, and the welding precision is poor. Hot plate welding is suitable for mass production of small parts, but has poor adaptability to geometric shape change of welding surfaces.
With the development of the laser industry and the reduction of the cost of lasers, laser plastic welding is gradually replacing the traditional welding mode. Laser welding is a technique in which heat generated by a laser beam melts a plastic contact surface, thereby bonding thermoplastic sheets, films, or molded parts together. Laser plastic welding has the following unique advantages over traditional plastic welding:
welding equipment does not need to contact with bonded plastic parts, is high in speed and automation degree, is suitable for processing complex plastic parts, can not generate flash, is firm in welding, can obtain a high-precision welding piece, is a vibration-free technology, can generate an airtight or vacuum sealing structure, and minimizes thermal damage and thermal deformation: the resins of different compositions or different colors can be bonded together with little heat input into the structural member and with a controlled minimum amount of melting.
However, laser welding requires high material requirements, requires penetration of the part by the laser radiation, requires strong absorption properties of the part, and avoids cracking between the two parts. Among plastics, thermoplastic polyesters have excellent heat resistance, weather resistance, chemical resistance, electrical characteristics, and low water absorption and good gloss, so they are often used as laser welding substrates, but PBT is a semi-crystalline material, in a milky translucent state, and has insufficient strength, so glass fibers are usually added to PBT to increase the strength of a composite material, but in laser welding, the welding effect is affected by the light transmittance of PBT, such as: for partial PBT materials, the laser transmittance at 940nm and 980nm is very low, and for the PBT material with the thickness of 1mm, the laser transmittance can be lower than 10%, which is very unfavorable for laser welding and leads to high PBT limitation; in addition, the PBT material has the problem that besides low laser transmittance, the surface of the material is very easy to absorb laser energy, so that burn is caused in the process of laser plastic welding.
Disclosure of Invention
The first object of the invention is to provide a glass fiber reinforced polyester material which can be welded by laser, has better strength, high laser transmittance and is not easy to burn by the laser.
A glass fiber reinforced polyester material capable of being welded by laser comprises the following components in parts by weight:
39-70 parts of thermoplastic polyester, 10-31 parts of PMMA, 10-30 parts of glass fiber, 0.1-0.4 part of antioxidant and 0.1-0.2 part of transesterification inhibitor.
Preferably, the thermoplastic polyester is PBT.
By adopting the technical scheme, (1) the PBT is a crystalline engineering material and is in a semitransparent state, after the PBT is added into the glass fiber, the strength of the composite material can be improved, and the burning of a single PBT surface in laser welding is avoided, but in the laser welding, the welding effect can be influenced by the light transmittance of the PBT, so that the light transmittance of the composite material is improved by adding PMMA, the PMMA is an amorphous polymer, and the light transmittance is excellent, (2) although the damage of the laser welding to the material is generally small and the heat affected zone is small, the anti-oxidant is added for reducing the damage due to the limitation of the PBT material, the ageing resistance of the composite material is enhanced, and the ageing of the composite material is delayed; (3) The transesterification inhibitor is added to control the progress of transesterification, so that the stability of the polyester material is improved, and the performance of the polyester material is ensured to be maintained at a better level.
Preferably, the thermoplastic polyester has an intrinsic viscosity of 0.8dl/g to 1.3dl/g.
Preferably, the glass fiber is alkali-free chopped glass fiber infiltrated with an epoxy silane coupling agent.
By adopting the technical scheme, the glass fiber is selected as the alkali-free chopped glass fiber infiltrated by the epoxy silane coupling agent, the interface bonding strength of the glass fiber and the matrix is enhanced by using the epoxy silane coupling agent, the strength of the composite material is improved, the compatilizer can be omitted, the expandability of the infiltrated glass fiber in the composite material is better, the compatibility among all components is enhanced, the stability of the composite material is improved, and the composite material can be better prevented from generating cracks in laser welding.
Preferably, the epoxy silane coupling agent is KH-560.
Preferably, the antioxidant comprises at least one of a phenolic antioxidant, an amine antioxidant and a phosphite antioxidant.
Preferably, the phenolic antioxidant comprises at least one of 2, 6-di-tert-butyl and 3, 5-di-tert-butyl-4-hydroxybenzyl diethyl phosphonate, the amine antioxidant comprises at least one of N-phenyl-alpha-naphthylamine and dioctyl diphenyl, and the phosphite antioxidant comprises at least one of DPDP and TPP.
Preferably, the transesterification inhibitor includes at least one of phosphorous acid, sodium dihydrogen phosphate, and sodium pyrophosphate.
Another object of the present application is to provide a method for preparing the glass fiber reinforced polyester material capable of laser welding, which comprises the following steps:
(1) Weighing the thermoplastic polyester, the PMMA, the glass fiber, the antioxidant and the transesterification inhibitor according to parts by weight;
(2) Putting the thermoplastic polyester, the PMMA, the antioxidant and the transesterification inhibitor into a high-speed mixer, and mixing for 8-15 min to obtain premix;
(3) Adding the premix obtained in the step (2) into a double-screw extruder, adding glass fibers into the double-screw extruder, and carrying out melt extrusion to obtain a molten material;
(4) And (3) bracing, cooling and granulating the molten state material obtained in the step (3) to obtain the glass fiber reinforced polyester material.
Preferably, in the step (3), the screw temperature of the twin-screw extruder is 230-260 ℃, and the screw rotating speed is 250-600 r/min.
The beneficial effects of the invention are as follows:
first, the glass fiber reinforced polyester material intensity that this application prepared is better, and the laser transmissivity is high, specifically is: PBT is crystalline engineering material, is translucent state, and after glass fiber added PBT, can improve the intensity of combined material, also avoid appearing single PBT surface burn in laser welding, but in laser welding, the welding effect still can receive the influence of PBT light transmissivity, so this application adds PMMA and improves combined material's luminousness, and PMMA is amorphous polymer, and the luminousness is splendid.
Secondly, the glass fiber reinforced polyester material prepared by the method is not easy to burn by laser, and specifically comprises the following steps: although the damage of laser welding to the material is generally small and the heat affected zone is small, due to the limitation of the PBT material, in order to reduce the damage, the antioxidant and the glass fiber are added, the expandability of the infiltrated glass fiber in the composite material is better, the crack of the composite material in the laser welding can be better prevented, in addition, under the condition of improving the strength, the ageing resistance of the composite material is enhanced, and the ageing of the composite material is delayed.
Thirdly, the glass fiber reinforced polyester material prepared by the method is good in compatibility and high in stability, and specifically comprises the following components: (1) The glass fiber is selected as the alkali-free chopped glass fiber infiltrated by the epoxy silane coupling agent, the interface bonding strength of the glass fiber and the matrix is enhanced by the epoxy silane coupling agent, the strength of the composite material is improved, the compatilizer can be omitted, the expandability of the infiltrated glass fiber in the composite material is better, the compatibility among the components is enhanced, and the stability of the composite material is improved; (2) The transesterification inhibitor is added to control the progress of transesterification, so that the stability of the polyester material is improved, and the performance of the polyester material is ensured to be maintained at a better level.
In conclusion, the glass fiber reinforced polyester material prepared by the method is good in strength, high in laser transmittance and not easy to burn by laser.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless otherwise specified, the reagents used in the examples were all readily available from commercial companies.
Example 1
A laser-weldable glass fiber reinforced polyester material, the formulation of which is shown in table 1 below:
TABLE 1
Figure SMS_1
Referring to table 1, the method for preparing the glass fiber reinforced polyester material capable of being welded by laser comprises the following steps:
(1) Preparing materials: fully soaking alkali-free chopped glass fibers in an epoxy silane coupling agent KH-560 to obtain glass fibers, and weighing thermoplastic polyester, PMMA, glass fibers, an antioxidant and an ester interchange inhibitor according to parts by weight;
(2) Premixing: adding thermoplastic polyester, PMMA, an antioxidant and a transesterification inhibitor into a high-speed mixer, and mixing for 10min to obtain a premix;
(3) Mixing: adding the premix obtained in the step (2) into a double-screw extruder through a main feeding port, adding glass fibers into the double-screw extruder from a side feeding port, and carrying out melt extrusion to obtain a molten material; wherein the temperature of each region of the screw of the double-screw extruder is 230 ℃, 235 ℃, 240 ℃, 245 ℃, 250 ℃, 255 ℃, 260 ℃ and the screw rotating speed is 400r/min;
(4) Granulating: and (3) bracing the molten material obtained in the step (3), cooling to 50 ℃, and granulating to obtain the glass fiber reinforced polyester material which is cylindrical particles with the diameter of 3 mm.
Example 2
A laser-weldable glass fiber reinforced polyester material, the formulation of which is shown in table 2 below:
TABLE 2
Figure SMS_2
Referring to table 2, the method for preparing the glass fiber reinforced polyester material capable of being welded by laser comprises the following steps:
(1) Preparing materials: fully soaking alkali-free chopped glass fibers in an epoxy silane coupling agent KH-560 to obtain glass fibers, and weighing thermoplastic polyester, PMMA, glass fibers, an antioxidant and an ester interchange inhibitor according to parts by weight;
(2) Premixing: adding thermoplastic polyester, PMMA, an antioxidant and a transesterification inhibitor into a high-speed mixer, and mixing for 12min to obtain a premix;
(3) Mixing: adding the premix obtained in the step (2) into a double-screw extruder through a main feeding port, adding glass fibers into the double-screw extruder from a side feeding port, and carrying out melt extrusion to obtain a molten material; wherein the temperature of each region of the screw of the double-screw extruder is 230 ℃, 235 ℃, 240 ℃, 245 ℃, 250 ℃, 255 ℃, 260 ℃ and the screw rotating speed is 300r/min;
(4) Granulating: and (3) bracing the molten material obtained in the step (3), cooling to 50 ℃, and granulating to obtain the glass fiber reinforced polyester material which is cylindrical particles with the diameter of 3 mm.
Example 3
A laser-weldable glass fiber reinforced polyester material, the formulation of which is shown in table 3 below:
TABLE 3 Table 3
Figure SMS_3
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Referring to table 3, the method for preparing the glass fiber reinforced polyester material capable of being welded by laser comprises the following steps:
(1) Preparing materials: fully soaking alkali-free chopped glass fibers in an epoxy silane coupling agent KH-560 to obtain glass fibers, and weighing thermoplastic polyester, PMMA, glass fibers, an antioxidant and an ester interchange inhibitor according to parts by weight;
(2) Premixing: adding thermoplastic polyester, PMMA, an antioxidant and a transesterification inhibitor into a high-speed mixer, and mixing for 10min to obtain a premix;
(3) Mixing: adding the premix obtained in the step (2) into a double-screw extruder through a main feeding port, adding glass fibers into the double-screw extruder from a side feeding port, and carrying out melt extrusion to obtain a molten material; wherein, the temperature of each region of the screw of the double-screw extruder is 230 ℃, 235 ℃, 240 ℃, 245 ℃, 250 ℃, 255 ℃, 260 ℃ and the screw rotating speed is 350r/min;
(4) Granulating: and (3) bracing the molten material obtained in the step (3), cooling to 50 ℃, and granulating to obtain the glass fiber reinforced polyester material which is cylindrical particles with the diameter of 3 mm.
Example 4
A laser-weldable glass fiber reinforced polyester material, the formulation of which is shown in table 4 below:
TABLE 4 Table 4
Figure SMS_4
Referring to table 4, the method for preparing the glass fiber reinforced polyester material capable of being welded by laser comprises the following steps:
(1) Preparing materials: fully soaking alkali-free chopped glass fibers in an epoxy silane coupling agent KH-560 to obtain glass fibers, and weighing thermoplastic polyester, PMMA, glass fibers, an antioxidant and an ester interchange inhibitor according to parts by weight;
(2) Premixing: adding thermoplastic polyester, PMMA, an antioxidant and a transesterification inhibitor into a high-speed mixer, and mixing for 8min to obtain a premix;
(3) Mixing: adding the premix obtained in the step (2) into a double-screw extruder through a main feeding port, adding glass fibers into the double-screw extruder from a side feeding port, and carrying out melt extrusion to obtain a molten material; wherein the temperature of each region of the screw of the double-screw extruder is 230 ℃, 235 ℃, 240 ℃, 245 ℃, 250 ℃, 255 ℃, 260 ℃ and the screw rotating speed is 550r/min;
(4) Granulating: and (3) bracing the molten material obtained in the step (3), cooling to 50 ℃, and granulating to obtain the glass fiber reinforced polyester material which is cylindrical particles with the diameter of 3 mm.
Comparative example 1
The formula of the glass fiber reinforced polyester material is shown in the following table 5:
TABLE 5
Figure SMS_5
Referring to table 5, the method for preparing the glass fiber reinforced polyester material capable of laser welding comprises the following steps:
(1) Preparing materials: weighing thermoplastic polyester, glass fiber, an antioxidant and a transesterification inhibitor according to parts by weight;
(2) Premixing: adding thermoplastic polyester, an antioxidant and a transesterification inhibitor into a high-speed mixer, and mixing for 10min to obtain a premix;
(3) Mixing: adding the premix obtained in the step (2) into a double-screw extruder through a main feeding port, adding glass fibers into the double-screw extruder from a side feeding port, and carrying out melt extrusion to obtain a molten material; wherein, the temperature of each region of the screw of the double-screw extruder is 230 ℃, 235 ℃, 240 ℃, 245 ℃, 250 ℃, 255 ℃, 260 ℃ and the screw rotating speed is 450r/min;
(4) Granulating: and (3) bracing the molten material obtained in the step (3), cooling to 50 ℃, and granulating to obtain the glass fiber reinforced polyester material which is cylindrical particles with the diameter of 3 mm.
Comparative example 2
The formula of the glass fiber reinforced polyester material is shown in the following table 6:
TABLE 6
Figure SMS_6
Referring to table 6, the method for preparing the glass fiber reinforced polyester material capable of being welded by laser comprises the following steps:
(1) Preparing materials: fully soaking alkali-free chopped glass fibers in an epoxy silane coupling agent KH-560 to obtain glass fibers, and weighing thermoplastic polyester, glass fibers, an antioxidant and an ester interchange inhibitor according to parts by weight;
(2) Premixing: adding thermoplastic polyester, an antioxidant and a transesterification inhibitor into a high-speed mixer, and mixing for 13min to obtain a premix;
(3) Mixing: adding the premix obtained in the step (2) into a double-screw extruder through a main feeding port, adding glass fibers into the double-screw extruder from a side feeding port, and carrying out melt extrusion to obtain a molten material; wherein the temperature of each region of the screw of the double-screw extruder is 230 ℃, 235 ℃, 240 ℃, 245 ℃, 250 ℃, 255 ℃, 260 ℃ and the screw rotating speed is 400r/min;
(4) Granulating: and (3) bracing the molten material obtained in the step (3), cooling to 50 ℃, and granulating to obtain the glass fiber reinforced polyester material which is cylindrical particles with the diameter of 3 mm.
The laser-weldable glass fiber-reinforced polyester materials of examples 1 to 4 and the glass fiber-reinforced polyester materials of comparative examples 1 to 2 were tested by taking samples of the same specification, the test criteria were as follows, the test results were referred to in table 7,
laser transmittance: the sample size is 100mm multiplied by 12mm multiplied by 1.3mm, the laser transmittance tester (manufacturer: LPKF, model: TMG 3) is adopted for testing, the laser wavelength is 980nm,
tensile strength: ISO-527
Flexural modulus: ISO 178
Notched impact strength of simply supported beams: ISO-179
TABLE 7
Figure SMS_7
Analysis of results:
laser light transmittance: the laser light transmittance of examples 1-4 is higher than that of comparative examples 1-2, and the highest energy exceeds 19%, which indicates that the light transmittance of the material is greatly improved by adding PMMA;
tensile strength, flexural modulus, notched impact strength of a simply supported beam: the values of examples 1-4 are not greatly different from those of comparative example 2, but the mechanical properties of comparative example 2 are obviously stronger than those of comparative example 1, which shows that the alkali-free chopped glass fibers treated by the coupling agent can better strengthen the mechanical properties of polyester materials, the glass fibers treated by the coupling agent form a buffer zone on the surface of the glass fibers, and even if the glass fibers of the same kind are selected, the content of the glass fibers can influence the mechanical properties, and the higher the content of the glass fibers is in a certain range (10-30 parts by weight in the application), the better the mechanical properties are, such that the glass fibers of examples 2-4 are higher than those of example 1, and the mechanical strength is better than that of example 1; according to the preparation method, under the condition that PMMA is added into the polyester material, alkali-free chopped glass fibers infiltrated by epoxy silane coupling agent KH-560 are added, the final composite material has good comprehensive performance, such as the same content of glass fibers in examples 2-4 and comparative example 2, the mechanical strength is not too much different, and the mechanical strength is relatively excellent, and examples 2-4 also have relatively high laser transmittance, so that the problem of compatibility is solved while the comprehensive performance is considered, the laser transmittance and the mechanical performance can be well balanced, and therefore, an operator can adjust the proportion of components according to actual requirements to highlight specific performances, such as example 4, and the laser transmittance is mainly optimized;
therefore, under the condition that the strength and the laser transmissivity of the glass fiber reinforced polyester material are comprehensively considered and the composite material is not easy to burn by laser, the glass fiber reinforced polyester material prepared by the method is more suitable for laser welding.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The glass fiber reinforced polyester material capable of being welded by laser is characterized by comprising the following components in parts by weight:
39-70 parts of thermoplastic polyester, 10-31 parts of PMMA, 10-30 parts of glass fiber, 0.1-0.4 part of antioxidant and 0.1-0.2 part of transesterification inhibitor.
2. The laser-weldable glass fiber reinforced polyester material of claim 1, wherein the thermoplastic polyester is PBT.
3. The laser-weldable glass fiber reinforced polyester material of claim 1, wherein the thermoplastic polyester has an intrinsic viscosity of 0.8dl/g to 1.3dl/g.
4. The laser-weldable glass fiber reinforced polyester material of claim 1, wherein the glass fibers are alkali-free chopped glass fibers impregnated with an epoxy silane coupling agent.
5. The laser-weldable glass fiber reinforced polyester material of claim 4, wherein the epoxy silane coupling agent is KH-560.
6. The laser-weldable glass fiber reinforced polyester material of claim 1, wherein the antioxidant comprises at least one of a phenolic antioxidant, an amine antioxidant, and a phosphite antioxidant.
7. The laser-weldable glass fiber reinforced polyester material of claim 6, wherein the phenolic antioxidant comprises at least one of 2, 6-di-t-butyl, 3, 5-di-t-butyl-4-hydroxybenzyl diethyl phosphonate, the amine antioxidant comprises at least one of N-phenyl- α -naphthylamine, dioctyl diphenyl, and the phosphite antioxidant comprises at least one of DPDP, TPP.
8. The laser-weldable glass fiber reinforced polyester material of claim 1, wherein the transesterification inhibitor comprises at least one of phosphorous acid, sodium dihydrogen phosphate, sodium pyrophosphate.
9. A method for preparing a laser-weldable glass-fibre reinforced polyester material according to any one of claims 1 to 8, comprising the steps of:
(1) Weighing the thermoplastic polyester, the PMMA, the glass fiber, the antioxidant and the transesterification inhibitor according to parts by weight;
(2) Putting the thermoplastic polyester, the PMMA, the antioxidant and the transesterification inhibitor into a high-speed mixer, and mixing for 8-15 min to obtain premix;
(3) Adding the premix obtained in the step (2) into a double-screw extruder, adding glass fibers into the double-screw extruder, and carrying out melt extrusion to obtain a molten material;
(4) And (3) bracing, cooling and granulating the molten state material obtained in the step (3) to obtain the glass fiber reinforced polyester material.
10. The method for producing a glass fiber reinforced polyester material capable of laser welding according to claim 9, wherein in the step (3), the screw temperature of the twin-screw extruder is 230 ℃ to 260 ℃, and the screw rotation speed is 250 to 600 r/min.
CN202310256079.3A 2023-03-16 2023-03-16 Glass fiber reinforced polyester material capable of being welded by laser and preparation method thereof Pending CN116200016A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
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