High-transmittance laser welding penetration PPA material and preparation method thereof

Abstract

The invention relates to a high-transmittance laser welding penetration PPA material and a preparation method thereof, and belongs to the technical field of polyamide-based high polymer materials, and the high-transmittance laser welding penetration PPA material comprises the following components by weight: 55-60% of PPA, 40% of glass fiber, 0-0.2% of toner, and 0-0.5% of an antioxidant. Aiming at the problem of insufficient laser transmittance in the prior art, the invention provides the high-transmittance laser welding penetration PPA material and the preparation method thereof.

Description

Technical Field

[0001] The present application belongs to the technical field of polyamide-based polymer materials, and specifically relates to a high-transmittance laser welding penetrating PPA material and a preparation method thereof. Background Art

[0002] Plastic laser welding technology is a technology that uses the heat generated by a high-energy laser beam acting on the material to melt the plastic contact surface, and then bonds the molded parts together to complete the welding. Compared with traditional hot pressing welding, vibration friction welding and ultrasonic welding, it has outstanding advantages such as high precision, high efficiency and low environmental pollution, and is especially suitable for the processing requirements of automotive plastic parts. At present, the development of the new energy vehicle industry is very rapid, and the demand for laser welding of electronic component housings, pump bodies, valve bodies, pipe joints and other parts is becoming more and more urgent. Major well-known companies in the industry have also begun to lead the shift from traditional welding methods to laser welding methods.

[0003] Polyamide (PA) materials have excellent comprehensive performance. After various functional modifications, they are widely used in automotive parts, electronic appliances, special equipment and other fields. PA6 and PA66 among aliphatic polyamides are the two with the largest production and sales volume and the widest application range, accounting for more than 60% of the production capacity of all types of polyamide. Therefore, the laser welding process of PA6 and PA66 modified composite materials has also been maturely applied in the above fields. However, with the addition of materials such as glass fiber and phosphorus-nitrogen halogen-free flame retardants, the laser transmittance of the composite material will also drop sharply. If it is used as a light-transmitting layer material for laser welding, it will face the problem of insufficient light transmittance.

[0004] In a laser-weldable halogen-free flame-retardant polyamide composite material and its preparation method with publication number CN117887247A, a composition of hydroquinone bis(diphenyl phosphate) and nano-silicon dioxide with a particle size of 5 to 60 nm is introduced to replace the nitrogen-based flame retardant in the traditional phosphorus-nitrogen synergistic system, and a new synergistic flame retardant system is formed with an organic phosphine flame retardant. Hydroquinone bis(diphenyl phosphate) is a solid phosphate flame retardant with high transparency and good laser transmittance, and does not produce a large plasticizing effect on the material like liquid phosphate, so the temperature resistance of the material is also very small. On the other hand, the presence of nano-silicon dioxide can enhance the crystallization ability of the polyamide material, reduce the thickness of the wafer, and improve the grain regularity, thereby effectively improving the laser transmittance of the material. The use of the halogen-free flame-retardant polyamide composite material of the present invention can simultaneously meet the requirements of laser welding, high flame retardancy, and halogen-free, with a laser transmittance of ≥28% (1 mm), and a flame retardant thickness of 1.5 mm meets the UL94 V-0 grade.

[0005] In the actual use process, the applicant found that at this stage, higher requirements are put forward for laser transmittance. In GB / T7247.1-2012 9.2 "Laser Product Safety Part 1. Equipment Classification and Requirements", the laser transmittance index requirement is ≥60%. The polyamide composite materials in the comparative documents and some existing technologies cannot meet this index. Summary of the invention

[0006] The purpose of the present invention is to provide a high-transmittance laser welding penetrating PPA material and a preparation method thereof in order to solve the problem of insufficient laser transmittance in the prior art.

[0007] In order to achieve the above technical purpose, the following technical solution is provided: a high-transmittance laser welding penetrating PPA material, comprising the following components in weight percentage: PPA 55%-60%, glass fiber 40%, color powder 0-0.2%, and antioxidant 0-0.5%.

[0008] In an embodiment, the following components are included in weight percentage: PPA 56%-58%, glass fiber 40%, color powder 0-0.2%, and antioxidant 0-0.5%.

[0009] In the present technical solution, the use of PPA material to replace PA material makes the thermal stability of PPA material better.

[0010] In an embodiment, the toners are yellow toner, red toner and a plurality of blue toners.

[0011] In this technical solution, the transmittance and absorptivity of the PPA material to laser light in yellow and red are similar and both are at a high level. By mixing the above three toners, the material can finally be extruded at a high temperature of more than 280° to be black.

[0012] In an embodiment, the yellow toner is selected from at least one of Pigment Yellow 13, Pigment Yellow 14, Pigment Yellow 83, and CI Pigment Yellow 192.

[0013] In an embodiment, the red toner is at least one of CI Solvent Red 179 and Solvent Red 52.

[0014] In an embodiment, the blue toner is one or more of phthalocyanine blue and pigment blue 15.

[0015] Using one of the above-mentioned pigments can not only ensure the transmittance of the laser to a great extent, but the red toner among the above-mentioned pigments can also serve as an interface lubricant to increase the laser transmittance.

[0016] In the second aspect, the preparation process of high-transmittance laser welding through PPA material includes the following steps: production by melt blending extrusion process, using a twin-screw extruder;

[0017] Firstly, the dried polyphthalamide and part of the glass fiber are mixed in proportion;

[0018] Then, color powder and antioxidant are added in order and mixed to form mixed material A;

[0019] Add the mixed material A from the main feeding port, and add the remaining glass fiber from the side feeding port, and then extrude, cool and granulate after melt blending.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The final product performance of this application is laser transmittance 70%, bending strength 330MPa, notched impact strength 11KJ / M 2 , non-notched impact strength 85KJ / m 2 In general, pigments will become ineffective above 280°, but in this application, the red, yellow and blue toners are mixed to make the final product black and will not become ineffective during high-temperature melt co-extrusion.

[0022] The composite material produced by the present invention can be applied to automobile engine peripherals and interior and exterior decoration products, has a friendly processing environment and meets the material selection requirements of major OEMs such as BYD and Chery. DETAILED DESCRIPTION

[0023] Below in conjunction with specific embodiment, further elaborate content of the present invention.It should be emphasized that these embodiments are only used for further explanation of the present invention, and can not be interpreted as limiting the scope of protection of the present invention.In addition, it should be understood that after reading the content described in the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the appended claims of the application.

[0024] Example 1: The high-transmittance laser welding penetrating PPA material of this example includes the following components in weight percentage: PPA 56%, glass fiber 40%, color powder 0.2%, and antioxidant 0.5%.

[0025] The yellow toner is selected from Pigment Yellow 13. The red toner is CI Solvent Red 179. The blue toner is Phthalocyanine Blue and Pigment Blue 15.

[0026] Example 2: The high-transmittance laser welding penetrating PPA material of this example includes the following components in percentage by weight: PPA 56%, glass fiber 40%, color powder 0.2%, and antioxidant 0.5%.

[0027] The yellow toner is selected from Pigment Yellow 14. The red toner is CI Solvent Red 179. The blue toner is Phthalocyanine Blue and Pigment Blue 15.

[0028] Example 3: The high-transmittance laser welding penetrating PPA material of this example includes the following components in weight percentage: PPA 56%, glass fiber 40%, color powder 0.2%, and antioxidant 0.5%.

[0029] The yellow toner is selected from Pigment Yellow 83. The red toner is CI Solvent Red 179. The blue toner is Phthalocyanine Blue and Pigment Blue 15.

[0030] Example 4: The high-transmittance laser welding penetrating PPA material of this example includes the following components in percentage by weight: PPA 56%, glass fiber 40%, color powder 0.2%, and antioxidant 0.5%.

[0031] The yellow toner is selected from CI Pigment Yellow 192. The red toner is CI Solvent Red 179. The blue toner is Phthalocyanine Blue and Pigment Blue 15.

[0032] Example 5: The high-transmittance laser welding penetrating PPA material of this example includes the following components in percentage by weight: PPA 56%, glass fiber 40%, color powder 0.2%, and antioxidant 0.5%.

[0033] The yellow toner is selected from CI Pigment Yellow 192. The red toner is Solvent Red 52. The blue toner is Phthalocyanine Blue and Pigment Blue 15.

[0034] Example 6: The high-transmittance laser welding penetrating PPA material of this example includes the following components in weight percentage: PPA 58%, glass fiber 40%, color powder 0.2%, and antioxidant 0.5%.

[0035] The yellow toner is selected from Pigment Yellow 13. The red toner is CI Solvent Red 179. The blue toner is Phthalocyanine Blue and Pigment Blue 15.

[0036] Embodiment 7: The high transmittance laser welding penetrating PPA material of this embodiment includes the following components in weight percentage: PPA 58%, glass fiber 40%, color powder 0.2%, and antioxidant 0.5%.

[0037] The yellow toner is selected from Pigment Yellow 14. The red toner is CI Solvent Red 179. The blue toner is Phthalocyanine Blue and Pigment Blue 15.

[0038] Embodiment 8: The high transmittance laser welding penetrating PPA material of this embodiment includes the following components in weight percentage: PPA 58%, glass fiber 40%, color powder 0.2%, and antioxidant 0.5%.

[0039] The yellow toner is selected from Pigment Yellow 83. The red toner is CI Solvent Red 179. The blue toner is Phthalocyanine Blue and Pigment Blue 15.

[0040] Embodiment 9: The high transmittance laser welding penetrating PPA material of this embodiment includes the following components in weight percentage: PPA 58%, glass fiber 40%, color powder 0.2%, and antioxidant 0.5%.

[0041] The yellow toner is selected from CI Pigment Yellow 192. The red toner is CI Solvent Red 179. The blue toner is Phthalocyanine Blue and Pigment Blue 15.

[0042] Example 10: The high-transmittance laser welding penetrating PPA material of this example includes the following components in weight percentage: PPA 58%, glass fiber 40%, color powder 0.2%, and antioxidant 0.5%.

[0043] The yellow toner is selected from CI Pigment Yellow 192. The red toner is Solvent Red 52. The blue toner is Phthalocyanine Blue and Pigment Blue 15.

[0044] The preparation steps of the above ten embodiments are all produced by melt blending extrusion process, using a twin-screw extruder. First, the dried polyphthalamide and part of the glass fiber are mixed in proportion; then the color powder and the antioxidant are added in order to form a mixed material A; the mixed material A is added from the main feed port of the twin-screw extruder, and the remaining glass fiber is added from the side feed port of the twin-screw extruder, and after melt blending, the mixed material is extruded, cooled, and granulated.

[0045] The laser transmittance performance test was conducted using a LPKF-TMG3 plastic laser transmittance measuring instrument, with a laser wavelength of 980nm and a sample thickness of 1-3mm. The laser transmittance of the ten examples measured for the 1mm material is shown in Table 1:

[0046]

[0047] Table 1

[0048] The laser transmittance of the material prepared by the formula of the present application can reach more than 70%, which can meet the actual production needs. The pigment selected in the present application can also be used as an interface lubricant to increase the laser transmittance, making it easier for the material to reach more than 70%.

Claims

1. A high transmittance laser welding method for penetrating PPA material, characterized in that: The invention comprises the following components in weight percentage: PPA 55%-60%, glass fiber 40%, color powder 0-0.2%, and antioxidant 0-0.5%.

2. The high transmittance laser welding through PPA material according to claim 1 is characterized in that: The invention comprises the following components in weight percentage: PPA 56%-58%, glass fiber 40%, color powder 0-0.2%, and antioxidant 0-0.5%.

3. The high transmittance laser welding through PPA material according to claim 1 or 2, characterized in that: The toners include yellow toner, red toner and a plurality of blue toners.

4. The high transmittance laser welding through PPA material according to claim 3 is characterized in that: The yellow toner is selected from at least one of Pigment Yellow 13, Pigment Yellow 14, Pigment Yellow 83, and CI Pigment Yellow 192.

5. The high transmittance laser welding through PPA material according to claim 3 is characterized in that: The red toner is at least one of CI Solvent Red 179 and Solvent Red 52.

6. The high transmittance laser welding through PPA material according to claim 3, characterized in that: The blue toner is one or more of phthalocyanine blue and pigment blue 15.

7. The method for preparing a high-transmittance laser welding through PPA material according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: adopting a melt blending extrusion process to produce the product, using a twin-screw extruder; Firstly, the dried polyphthalamide and part of the glass fiber are mixed in proportion; Then, color powder and antioxidant are added in order and mixed to form mixed material A; Add the mixed material A from the main feeding port, and add the remaining glass fiber from the side feeding port, and then extrude, cool and granulate after melt blending.

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