Polyphenylene sulfide composite material for RFID laser welding and preparation method thereof

Abstract

The invention belongs to the technical field of composite materials, and particularly discloses a polyphenylene sulfide composite material for RFID laser welding and a preparation method thereof, the composite material comprises the following components by mass: 60-80 parts of polyphenylene sulfide, 1-8 parts of anti-reflection elastic resin, 25 parts of flat glass fiber, 0.5-1 part of a coupling agent, 0.5-1.5 parts of an antioxidant, and 3-10 parts of an anti-reflection agent. According to the polyphenylene sulfide composite material for RFID laser welding and the preparation method of the polyphenylene sulfide composite material, the laser transmittance and the welding strength of the composite material are synergistically improved through specific types of anti-reflection elastomers and anti-reflection agents; the problems that a traditional PPS material is low in laser transmittance, insufficient in welding strength, prone to cracking and bulging in secondary injection molding and the like are solved. The composite material is suitable for RFID tag laser welding packaging and can be widely applied to the fields of electronics, aviation, petrochemical engineering and the like.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, specifically relating to a polyphenylene sulfide composite material for RFID laser welding and its preparation method. Background Technology

[0002] RFID (Radio Frequency Identification) is a communication technology that identifies specific targets and reads / writes related data via radio signals without requiring mechanical or optical contact between the identification system and the target. Polyphenylene sulfide (PPS), with its properties of high temperature resistance, corrosion resistance, chemical resistance, and flame retardancy, is widely used in RFID production. RFID devices based on PPS composite materials are widely used in various fields such as household services, petroleum, and aviation.

[0003] Traditional RFID systems assemble prototypes using a step-by-step injection molding method: the RF chip is fixed on a plastic base, and the upper surface of the chip is covered by a secondary injection molding process. However, in practical use, it has been found that RFID products manufactured based on secondary injection molding suffer from problems such as burrs, cracks, warping, and bulging, which limits the application of RFID in fields such as artificial intelligence and aerospace.

[0004] Laser welding offers advantages such as high precision and strong adaptability, and is currently widely used in the automotive, aerospace, medical, and electronics industries. Using laser welding to fabricate RFID components can significantly improve the strength and appearance of the parts.

[0005] Currently, a common problem in PPS laser welding is the low laser transmittance of the transmission layer. This weakens the absorption of infrared light by the absorption layer and reduces the bonding strength of the interface layer. Carbon fiber reinforced PPS composites are now widely used as the raw material for the absorption layer to enhance infrared absorption. However, the laser transmittance of the transmission layer material still struggles to balance strength, toughness, and high-temperature resistance, becoming a key issue hindering the widespread adoption of PPS-based RFID laser welding.

[0006] Therefore, there is a need in the field to develop a polyphenylene sulfide composite material for RFID laser welding and its preparation method, which can effectively solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a polyphenylene sulfide (PPS) composite material for RFID laser welding and its preparation method. By using specific types of antireflective elastomers and antireflective agents, the composite material achieves a synergistic improvement in laser transmittance and welding strength, thereby solving the problems of low laser transmittance, insufficient welding strength, easy cracking during secondary injection molding, and bulging associated with traditional PPS materials. This composite material is suitable for laser welding and encapsulation of RFID tags and can be widely used in electronics, aerospace, petrochemical, and other fields.

[0008] To achieve the above objectives, the present invention provides a polyphenylene sulfide composite material for RFID laser welding, comprising the following components by weight: 60-80 parts polyphenylene sulfide, 1-8 parts antireflective elastic resin, 25 parts flat glass fiber, 0.5-1 part coupling agent, 0.5-1.5 parts antioxidant, and 3-10 parts antireflective agent.

[0009] Preferably, the polyphenylene sulfide is a linear polyphenylene sulfide with a molecular weight of 40,000-50,000 Da.

[0010] Preferably, the antireflective elastic resin is a thermoplastic elastomer, including one or more combinations of styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butene-styrene block copolymer (SEBS), thermoplastic vulcanizate (TPV), thermoplastic polyurethane elastomer (TPU), and ethylene-vinyl acetate copolymer (EVA).

[0011] Preferably, the coupling agent is one or a combination of lithium stearate, sodium stearate, calcium stearate, aluminum stearate, magnesium stearate, and zinc stearate.

[0012] Preferably, the antioxidants include hindered phenolic antioxidants, amine antioxidants, and nano-SiO2 composite antioxidants.

[0013] Preferably, the hindered phenolic antioxidant includes one or a combination of several of the following: pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (1010), tris(2,4-di-tert-butylphenyl)phosphite (168), and N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine (1520).

[0014] Preferably, the brightening agent includes one or a combination of several of the following: scaly calcium carbonate, zinc selenide, zinc sulfide, potassium chloride, and aniline black.

[0015] This invention also provides a method for preparing polyphenylene sulfide composite materials for RFID laser welding, comprising the following steps: Step S1: Weigh each raw material according to the mass fraction; Step S2: Place the polyphenylene sulfide in a drying oven at 130℃ and dry for 4 hours; mix the dried polyphenylene sulfide, antireflective elastic resin, coupling agent, and antioxidant for 5-10 minutes to obtain a mixture; Step S3: Add the mixture to the main feed port of the twin-screw extruder, and add the brightener and flat glass fiber to the side feed ports of the twin-screw extruder respectively. Step S4: The polyphenylene sulfide composite material for RFID laser welding is obtained by sequentially performing melt blending, extrusion, and granulation using a twin-screw extruder.

[0016] Preferably, in step S4, the temperature of the twin-screw extruder is 280-330℃, and the screw speed of the twin-screw extruder is 300-400 rpm.

[0017] Preferably, in step S4, the temperatures of each heating section of the twin-screw extruder are 160℃, 180℃, 280℃, 280℃, 280℃, 280℃, 285℃, 290℃, 290℃, 290℃, and 295℃, respectively.

[0018] The present invention employs the above-mentioned method for preparing polyphenylene sulfide composite material for RFID laser welding, and the beneficial effects are as follows: (1) This invention uses high-performance antireflective elastic resin and antireflective agent to improve the laser transmittance, welding strength and dimensional stability of PPS with minimal addition of components. Moreover, the composite material has excellent high temperature resistance and lubricating oil aging resistance, which can meet the requirements of RFID use in harsh environments.

[0019] (2) The composite material in this invention can be produced by conventional twin-screw extrusion and injection molding. The process is mature and can be mass-produced. It is suitable for laser welding of the through-layer of RFID tags and can be widely used in high-end fields such as electronics, home appliances, petroleum, and aerospace.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a graph showing the relationship between welding strength and laser transmittance of various samples in an experimental example of an RFID laser welding polyphenylene sulfide composite material and its preparation method according to the present invention. Detailed Implementation

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0024] The polyphenylene sulfide used in the embodiments of the present invention is linear polyphenylene sulfide produced by Shandong Minghua New Materials, including MAN010, MAN015 and MAN030, all with a molecular weight of 40,000-50,000 Da.

[0025] Example 1 A method for preparing polyphenylene sulfide composite materials for RFID laser welding includes the following steps: Step S1: Weigh the raw materials according to the following mass percentages: 64 parts polyphenylene sulfide, 4 parts antireflective elastic resin, 25 parts flat glass fiber, 1 part coupling agent, 1 part antioxidant, and 5 parts antireflective agent.

[0026] The antireflective elastic resin is a styrene-butadiene-styrene block copolymer, the coupling agent is lithium stearate, the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid], and the antireflective agent is scaly calcium carbonate.

[0027] Step S2: Dry the polyphenylene sulfide in a drying oven at 130°C for 4 hours. Mix the dried polyphenylene sulfide, antireflective elastic resin, coupling agent, and antioxidant for 8 minutes to obtain a mixture.

[0028] Step S3: Add the mixture to the main feed port of the twin-screw extruder, and add the brightener and flat glass fiber to the side feed ports of the twin-screw extruder respectively.

[0029] Step S4: At a temperature of 280-330℃ and a screw speed of 300 rpm, the mixture is melt-blended, extruded, and granulated sequentially using a twin-screw extruder. The heating temperatures of each section of the twin-screw extruder are 160℃, 180℃, 280℃, 280℃, 280℃, 280℃, 285℃, 290℃, 290℃, 290℃, and 295℃, respectively, thus obtaining the polyphenylene sulfide composite material for RFID laser welding.

[0030] Comparative Example 1 A method for preparing a polyphenylene sulfide composite material includes the following steps: Step S1: Weigh the raw materials according to the following mass percentages: 73 parts polyphenylene sulfide, 25 parts flat glass fiber, 1 part coupling agent, and 1 part antioxidant.

[0031] The coupling agent is lithium stearate, and the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid].

[0032] Step S2: Dry the polyphenylene sulfide in a drying oven at 130°C for 4 hours. Mix the dried polyphenylene sulfide, coupling agent, and antioxidant for 8 minutes to obtain a mixture.

[0033] Step S3: Add the mixture to the main feed port of the twin-screw extruder, and add the flat glass fiber to the side feed port of the twin-screw extruder.

[0034] Step S4: At a temperature of 280-330℃ and a screw speed of 300 rpm, the mixture is melt-blended, extruded, and granulated sequentially using a twin-screw extruder. The heating temperatures of each section of the twin-screw extruder are 160℃, 180℃, 280℃, 280℃, 280℃, 280℃, 285℃, 290℃, 290℃, 290℃, and 295℃, respectively, to obtain the polyphenylene sulfide composite material.

[0035] Comparative Example 2 A method for preparing a polyphenylene sulfide composite material includes the following steps: Step S1: Weigh the raw materials according to the following mass proportions: 71 parts polyphenylene sulfide, 2 parts antireflective elastic resin, 25 parts flat glass fiber, 1 part coupling agent, and 1 part antioxidant.

[0036] The antireflective elastic resin is a styrene-butadiene-styrene block copolymer, the coupling agent is lithium stearate, and the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid].

[0037] Step S2: Dry the polyphenylene sulfide in a drying oven at 130°C for 4 hours. Mix the dried polyphenylene sulfide, antireflective elastic resin, coupling agent, and antioxidant for 8 minutes to obtain a mixture.

[0038] Step S3: Add the mixture to the main feed port of the twin-screw extruder, and add the flat glass fiber to the side feed port of the twin-screw extruder.

[0039] Step S4: At a temperature of 280-330℃ and a screw speed of 300 rpm, the mixture is melt-blended, extruded, and granulated sequentially using a twin-screw extruder. The heating temperatures of each section of the twin-screw extruder are 160℃, 180℃, 280℃, 280℃, 280℃, 280℃, 285℃, 290℃, 290℃, 290℃, and 295℃, respectively, to obtain the polyphenylene sulfide composite material.

[0040] Comparative Example 3 A method for preparing a polyphenylene sulfide composite material includes the following steps: Step S1: Weigh the raw materials according to the following mass percentages: 69 parts polyphenylene sulfide, 4 parts antireflective elastic resin, 25 parts flat glass fiber, 1 part coupling agent, and 1 part antioxidant.

[0041] The antireflective elastic resin is a styrene-butadiene-styrene block copolymer, the coupling agent is lithium stearate, and the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid].

[0042] Step S2: Dry the polyphenylene sulfide in a drying oven at 130°C for 4 hours. Mix the dried polyphenylene sulfide, antireflective elastic resin, coupling agent, and antioxidant for 8 minutes to obtain a mixture.

[0043] Step S3: Add the mixture to the main feed port of the twin-screw extruder, and add the flat glass fiber to the side feed port of the twin-screw extruder.

[0044] Step S4: At a temperature of 280-330℃ and a screw speed of 300 rpm, the mixture is melt-blended, extruded, and granulated sequentially using a twin-screw extruder. The heating temperatures of each section of the twin-screw extruder are 160℃, 180℃, 280℃, 280℃, 280℃, 280℃, 285℃, 290℃, 290℃, 290℃, and 295℃, respectively, to obtain the polyphenylene sulfide composite material.

[0045] Comparative Example 4 A method for preparing a polyphenylene sulfide composite material includes the following steps: Step S1: Weigh the raw materials according to the following mass percentages: 67 parts polyphenylene sulfide, 6 parts antireflective elastic resin, 25 parts flat glass fiber, 1 part coupling agent, and 1 part antioxidant.

[0046] The antireflective elastic resin is a styrene-butadiene-styrene block copolymer, the coupling agent is lithium stearate, and the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid].

[0047] Step S2: Dry the polyphenylene sulfide in a drying oven at 130°C for 4 hours. Mix the dried polyphenylene sulfide, antireflective elastic resin, coupling agent, and antioxidant for 8 minutes to obtain a mixture.

[0048] Step S3: Add the mixture to the main feed port of the twin-screw extruder, and add the flat glass fiber to the side feed port of the twin-screw extruder.

[0049] Step S4: At a temperature of 280-330℃ and a screw speed of 300 rpm, the mixture is melt-blended, extruded, and granulated sequentially using a twin-screw extruder. The heating temperatures of each section of the twin-screw extruder are 160℃, 180℃, 280℃, 280℃, 280℃, 280℃, 285℃, 290℃, 290℃, 290℃, and 295℃, respectively, to obtain the polyphenylene sulfide composite material.

[0050] Comparative Example 5 A method for preparing a polyphenylene sulfide composite material includes the following steps: Step S1: Weigh the raw materials according to the following mass percentages: 68 parts polyphenylene sulfide, 25 parts flat glass fiber, 1 part coupling agent, 1 part antioxidant, and 5 parts anti-reflective agent.

[0051] The coupling agent is lithium stearate, the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and the permeability enhancer is scaly calcium carbonate.

[0052] Step S2: Dry the polyphenylene sulfide in a drying oven at 130°C for 4 hours. Mix the dried polyphenylene sulfide, coupling agent, and antioxidant for 8 minutes to obtain a mixture.

[0053] Step S3: Add the mixture to the main feed port of the twin-screw extruder, and add the brightener and flat glass fiber to the side feed ports of the twin-screw extruder respectively.

[0054] Step S4: At a temperature of 280-330℃ and a screw speed of 300 rpm, the mixture is melt-blended, extruded, and granulated sequentially using a twin-screw extruder. The heating temperatures of each section of the twin-screw extruder are 160℃, 180℃, 280℃, 280℃, 280℃, 280℃, 285℃, 290℃, 290℃, 290℃, and 295℃, respectively, to obtain the polyphenylene sulfide composite material.

[0055] Experimental Example The polyphenylene sulfide composite materials prepared in Example 1 and Comparative Examples 1-5 were added to an injection molding machine to obtain test strips of RFID laser transmission layer through a mold. The laser transmission layer was then connected to the same laser absorption layer by laser welding. The weather resistance of each sample was tested, and the test results are shown in Table 1.

[0056] Meanwhile, a sample strip with a thickness equal to RFID (1mm) was obtained by injection molding, and the laser transmittance and welding strength of the sample strip were tested.

[0057] The weather resistance test conditions were 150±10℃ for 24 hours, and the lubricating oil was 105±10℃ for 24 hours. Bulging and cracking were observed. The laser welding power was 150W, and the mechanical properties were tested according to ISO 527.

[0058] Table 1 Test Results

[0059] like Figure 1 As shown, adding antireflective elastic resin improves the laser transmittance and weld strength of the material; however, an elastomer proportion exceeding 6% can affect laser transmittance and cause slight bulging during high-temperature lubricating oil aging tests. Adding antireflective agents improves both the laser transmittance and weld strength. The addition of both antireflective elastomers and antireflective agents has a synergistic effect on improving both the laser transmittance and weld strength of the material.

[0060] Therefore, this invention employs the aforementioned polyphenylene sulfide (PPS) composite material for RFID laser welding and its preparation method. By using specific types of antireflective elastomers and antireflective agents, the composite material achieves a synergistic improvement in laser transmittance and welding strength, thereby solving the problems of low laser transmittance, insufficient welding strength, easy cracking during secondary injection molding, and bulging associated with traditional PPS materials. This composite material is suitable for laser welding and encapsulation of RFID tags and can be widely used in electronics, aerospace, petrochemical, and other fields.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A polyphenylene sulfide composite material for RFID laser welding, characterized in that, The composition includes the following components by weight: 60-80 parts polyphenylene sulfide, 1-8 parts antireflective elastic resin, 25 parts flat glass fiber, 0.5-1 part coupling agent, 0.5-1.5 parts antioxidant, and 3-10 parts antireflective agent.

2. The polyphenylene sulfide composite material for RFID laser welding according to claim 1, characterized in that: The polyphenylene sulfide is a linear polyphenylene sulfide with a molecular weight of 40,000-50,000 Da.

3. The polyphenylene sulfide composite material for RFID laser welding according to claim 1, characterized in that: The antireflective elastic resin is a thermoplastic elastomer, including one or more of the following: styrene-butadiene-styrene block copolymer, styrene-ethylene-butene-styrene block copolymer, thermoplastic vulcanizate, thermoplastic polyurethane elastomer, and ethylene-vinyl acetate copolymer.

4. The polyphenylene sulfide composite material for RFID laser welding according to claim 1, characterized in that: The coupling agent is one or a combination of lithium stearate, sodium stearate, calcium stearate, aluminum stearate, magnesium stearate, and zinc stearate.

5. The polyphenylene sulfide composite material for RFID laser welding according to claim 1, characterized in that: Antioxidants include hindered phenolic antioxidants, amine antioxidants, and nano-SiO2 composite antioxidants.

6. The polyphenylene sulfide composite material for RFID laser welding according to claim 5, characterized in that: Hindered phenolic antioxidants include one or a combination of several of the following: pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris(2,4-di-tert-butylphenyl)phosphite, and N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine.

7. The polyphenylene sulfide composite material for RFID laser welding according to claim 1, characterized in that: The brightening agent includes one or a combination of several of the following: scaly calcium carbonate, zinc selenide, zinc sulfide, potassium chloride, and aniline black.

8. A method for preparing polyphenylene sulfide composite materials for RFID laser welding as described in any one of claims 1-7, characterized in that, Includes the following steps: Step S1: Weigh each raw material according to the mass fraction; Step S2: Place the polyphenylene sulfide in a drying oven at 130°C and dry for 4 hours; Mix the dried polyphenylene sulfide, antireflective elastic resin, coupling agent, and antioxidant for 5-10 minutes to obtain a mixture. Step S3: Add the mixture to the main feed port of the twin-screw extruder, and add the brightener and flat glass fiber to the side feed ports of the twin-screw extruder respectively. Step S4: The polyphenylene sulfide composite material for RFID laser welding is obtained by sequentially performing melt blending, extrusion, and granulation using a twin-screw extruder.

9. A method for preparing a polyphenylene sulfide composite material for RFID laser welding according to claim 8, characterized in that: In step S4, the temperature of the twin-screw extruder is 280-330℃, and the screw speed of the twin-screw extruder is 300-400 rpm.

10. A method for preparing a polyphenylene sulfide composite material for RFID laser welding according to claim 8, characterized in that: In step S4, the temperatures of each heating section of the twin-screw extruder are 160℃, 180℃, 280℃, 280℃, 280℃, 280℃, 285℃, 290℃, 290℃, 290℃, and 295℃, respectively.

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