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A kind of laser welding easy-processing polycarbonate composition and preparation method thereof

A polycarbonate and laser welding technology, which is applied in the field of polymer materials, can solve the problems of narrow range of laser intensity and welding speed, long production cycle, and low weld strength, so as to avoid molten pool collapse, improve melt strength, The effect of high melt strength

Active Publication Date: 2018-01-26
SHANGHAI KUMHO SUNNY PLASTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When using laser welding to weld polymers, the laser intensity and welding speed are usually adjusted to control the appearance and weld strength of the welded parts. For ordinary polycarbonate compositions, the applicable range of laser intensity and welding speed is relatively narrow, not only production The cycle is long, the production efficiency is low, and it is easy to weld poorly
When the welding is excessive, the surface of the workpiece is raised or even severely penetrated to affect the appearance of the workpiece. When the welding is insufficient, the weld strength is low, and the workpiece is easy to crack.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A polycarbonate composition with good laser welding performance and a preparation method thereof, the method comprising the following steps:

[0039] (1) Weigh each component by weight: PC 2: 50, ABS: 40, SAN: 10, carbon black: 0.1, antioxidant 245: 0.1, antioxidant 168: 0.1, lubricant PETS: 0.3.

[0040] (2) Feed the raw materials from the feeding port, melt and extrude at 200-280°C, the screw extruder rotates at 500rpm, and the pressure is 2MPa, melts and extrudes, and granulates to obtain the product.

[0041] (3) The screw diameter of the extruder is 35 mm, and the aspect ratio is 32.

Embodiment 2

[0043] (1) Weigh each component by weight: PC 2: 70, ABS: 25, SAN: 5, carbon black: 0.1, antioxidant 245: 0.1, antioxidant 168: 0.1, lubricant PETS: 0.3.

[0044] 2) Feed the raw materials from the feeding port, melt and extrude at 200-280°C, the screw extruder rotates at 500rpm, and the pressure is 2MPa, melts and extrudes, and granulates to obtain the product.

[0045] (3) The screw diameter of the extruder is 35 mm, and the aspect ratio is 32.

Embodiment 3

[0047] (1) Weigh each component by weight: PC 2: 75, ABS: 15, SAN: 10, PTFE: 0.5, carbon black: 0.1, antioxidant 245: 0.1, antioxidant 168: 0.1, lubricant PETS: 0.3.

[0048] 2) Feed the raw materials from the feeding port, melt and extrude at 200-280°C, the screw extruder rotates at 500rpm, and the pressure is 2MPa, melts and extrudes, and granulates to obtain the product.

[0049] (3) The screw diameter of the extruder is 35 mm, and the aspect ratio is 32.

[0050] Each comparative example and embodiment was injection-molded into a high-gloss plate of 150mm*100mm*2mm, and the injection-molded high-gloss plate and the transparent PMMA plate were alternately placed together, and irradiated with a semiconductor laser (960nm) with a beam diameter of 2mm. By controlling the laser intensity and welding speed, the surface state of the sample after welding is compared. Saw the laser-welded sample into strips with a width of 10mm, clamp the PMMA sample at one end and the PC / ABS at ...

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Abstract

The invention relates to a laser welding tractable polycarbonate composition and a preparation method thereof. The composition comprises the following components in parts by weight: 50-80 parts of polycarbonate (PC) resin, 15-40 parts of ABS resin, 5-10 parts of amelt reinforcing agent, 0.1-1 part of a near infrared laser absorbent, 0.1-1 part of an antioxidant and 0.1-1 part of a lubricant. The preparation method of the alloy comprises the following steps: (a) mixing the PC resin, the ABS resin, the melt reinforcing agent, the near infrared laser absorbent, the antioxidant and the lubricant in a mixing agitator; and (b) performing blending granulation on the mixture obtained in the step (a) by virtue of a twin-screw extruder to obtain a product. Compared with the prior art, the polycarbonate composition provided by the invention is higher in melt strength after the melt reinforcing agent is added, so that the surface of a product after welding has no bulges orbreakdowns, welding can be performed under a higher laser intensity, the obtained product is higher in welding strength at the same time, a processing window of a laser welding process of the polycarbonate composition is broadened, and the laser welding tractable polycarbonate composition is obtained.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a laser-welded and easily processed polycarbonate composition and a preparation method thereof. Background technique [0002] Compared with traditional welding methods, laser welding uses high-energy laser beams as the heat source. Compared with traditional welding methods, it has the characteristics of fast speed, fine structure, small heat-affected zone, and good forming. Laser welding technology has become the trend of future welding. Generally, among the polymers joined by laser welding, one polymer product is transmissive to near-infrared laser light, and the other polymer product absorbs the laser light and generates heat, which melts the polymers and produces interfacial welding. [0003] When using laser welding to weld polymers, the laser intensity and welding speed are usually adjusted to control the appearance and weld strength of the welded parts. For ordinary polyca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L69/00C08L55/02C08L25/12C08L27/18C08K13/02C08K3/04C08K5/526C08K3/22C08K5/103
CPCC08L69/00C08L2205/03C08L2205/035C08L55/02C08L25/12C08K13/02C08K3/04C08K5/526C08K2003/2296C08K5/103C08L27/18
Inventor 王尧李强罗明华辛敏琦
Owner SHANGHAI KUMHO SUNNY PLASTICS
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