A kind of transparent laser welding endothermic PC plastic and preparation method thereof

A laser welding and transparent technology, which is applied in the field of transparent laser welding heat-absorbing PC plastics and its preparation, can solve the problems of inability to realize the transparency of the weld seam, poor laser welding effect, and low welding strength, and achieve good laser fusion welding effect , low cost, good impact resistance

Active Publication Date: 2022-05-17
王晖
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent discloses a PC / ABS alloy used for laser welding. It records that PC and ABS plastics are compounded, and the effect of synergistic absorption of laser energy is achieved by doping nano-copper sulfide and graphite. It has been verified by experiments that graphite is not added as a nano- Although the PC / ABS spline of copper sulfide infrared absorption synergist can be welded, the welding strength is low, it is easy to crack, and the effect of laser welding is very poor; and adding graphite and nano-copper sulfide for synergistic effect makes the PC / ABS alloy The tensile strength can reach more than 40MPa, with higher welding strength, and with the increase of graphite and nano-copper sulfide, the welding strength continues to increase
It can be seen that the technical content of this patent is mainly due to the synergistic effect of adding graphite and nano-copper sulfide to achieve a good welding effect for PC / ABS alloys; Transparency at the weld seam cannot be achieved

Method used

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  • A kind of transparent laser welding endothermic PC plastic and preparation method thereof
  • A kind of transparent laser welding endothermic PC plastic and preparation method thereof

Examples

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Effect test

preparation example Construction

[0028] The present invention also provides a preparation method for transparent laser welding heat-absorbing PC plastic described in the above technical solution, comprising the following steps:

[0029] Stir and mix PC resin, compatibilizer, lubricant, nano metal oxide and antioxidant according to the ratio of raw materials to obtain a premix;

[0030] The premixed material is fed into an extruder through a main feeding port for melt extrusion to obtain a transparent laser-welded heat-absorbing PC plastic.

[0031] In the present invention, it is sufficient to stir and mix the raw materials evenly, and there is no requirement on the stirring rate. In the present invention, the screw speed of the twin-screw extruder is preferably 300-400 r / min, more preferably 350 r / min. In the present invention, the vacuum degree during extrusion is preferably -0.8 to -0.5 MPa, more preferably -0.65 MPa. In the present invention, the barrel temperature of the extruder is preferably 270-290°...

Embodiment 1

[0042] A transparent laser welding heat-absorbing PC plastic, prepared from the following components: PC Covestro Markolon 280598.9kg, gallium oxide (D50=50nm) 0.3kg, PETS 0.1kg, antioxidant 1680.35kg, antioxidant 10760.35kg.

[0043] The preparation method of the above-mentioned transparent laser welding endothermic PC plastic comprises the following steps:

[0044] Stir and mix PC resin, lubricant, nano metal oxide and antioxidant to obtain a premix;

[0045] The premixed material is fed into the extruder through the main feeding port for melt extrusion, the screw speed of the twin-screw extruder is controlled at 350r / min, the barrel temperature is 280°C, and the extrusion vacuum is -0.65MPa , to obtain transparent laser welding endothermic PC plastic.

[0046] The transparent laser welding heat-absorbing PC plastic prepared in Example 1 was used to measure the transparency and perform a welding test. The test results are shown in Table 1.

Embodiment 2

[0048] A transparent laser welding heat-absorbing PC plastic, the preparation raw materials are the following components:

[0049] Sabic141R 98.7kg, gallium oxide (D50=50nm) 0.3kg, indium oxide (D50=50nm) 0.3kg, PETS1kg, antioxidant 1680.35kg, antioxidant 10760.35kg.

[0050] The preparation method of the above-mentioned transparent laser welding endothermic PC plastic comprises the following steps:

[0051] Stir and mix PC resin, lubricant, nano metal oxide and antioxidant to obtain a premix;

[0052] The premixed material is fed into the extruder through the main feeding port for melt extrusion, the screw speed of the twin-screw extruder is controlled at 350r / min, the barrel temperature is 280°C, and the extrusion vacuum is -0.65MPa , to obtain transparent laser welding endothermic PC plastic.

[0053] The transparency of the transparent laser-welded endothermic PC plastic prepared in Example 2 was measured and the welding test was performed. The test results are shown in ...

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Abstract

The invention provides a transparent laser welding heat-absorbing PC plastic and a preparation method thereof, belonging to the technical field of laser welding plastic preparation. The preparation raw materials are PC resin, lubricant, nanometer metal oxide and antioxidant. The invention does not need to add carbon black, graphite and other dark materials at all, and the nano metal oxide in the PC resin can meet the heat absorption effect of transparent laser welding PC plastic products, and achieve a good laser fusion welding effect; the lubricant has excellent internal and external lubrication It is also a dispersant for nano-metal oxides, which further promotes the laser absorption effect of the product. The results of the examples show that the transparent laser welding endothermic PC plastic prepared by the present invention rarely adds plastic additives, can maintain product transparency > 80%, can achieve a good laser melting effect of PC plastic, and does not affect the material after welding Transparency, the tensile strength of the weld reaches more than 50MPa.

Description

technical field [0001] The invention relates to the technical field of laser welding plastic preparation, in particular to a transparent laser welding heat-absorbing PC plastic and a preparation method thereof. Background technique [0002] The principle of infrared laser welding for plastics is as follows: place plastic welding consumables on the place to be welded, place ordinary transparent plastic on top, such as ordinary PC resin with good light transmittance; place other types of plastic that can release heat after absorbing laser energy on the bottom ; The laser beam reaches the contact interface through the ordinary transparent PC resin above. When the energy gathers to a certain extent, the upper and lower plastics at the interface will be melted, and the two parts will be fused into one after cooling. [0003] The Chinese patent discloses a PC / ABS alloy used for laser welding. It records that PC and ABS plastics are compounded, and the effect of synergistic absorpt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L69/00C08K13/02C08K5/103C08K3/22
CPCC08K13/02C08K5/103C08K3/22C08K2201/011C08K2201/003C08K2003/2231C08L69/00
Inventor 王晖
Owner 王晖
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