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Light-emitting diode (LED) reflecting mirror for automobile, and preparation method of LED reflecting mirror

A mirror and automobile technology, applied in the field of auto parts, can solve the problems of insufficient melting of PC materials, inability to proceed smoothly in the injection molding process, and yellowing of air spots in injection molded parts, achieving dimensional stability, short production cycle, and light pattern deviation. small effect

Inactive Publication Date: 2018-05-15
HASCO VISION TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the melting temperature is too low, the PC material cannot be fully melted, and the injection molding process cannot be carried out smoothly. If the temperature is too high, the PC material will be partially degraded, which will easily lead to defects such as gas spots and yellowing of the injection molded parts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The reflector adopts PC material with low expansion and low shrinkage of the present invention (purchased from SABIC Plastics Co., Ltd.), the material is filled with glass fiber, and the filling ratio is about 20%. The mold shrinkage rate is 0.32% parallel to the flow direction, and perpendicular to the flow direction. The flow direction is 0.34%; the coefficient of thermal expansion parallel to the flow direction is 0.42×10 －4 / K, perpendicular to the flow direction is 0.43×10 －4 / K. Injection molding process: the barrel temperature is 240°C for the rear section, 270°C for the middle section, and 290°C for the front section; the nozzle temperature is 270°C; the molten material enters the mold from the nozzle, and the mold temperature is 150°C for injection molding, and then passes through cooling water for rapid cooling , the cooling time is 95s, and the injection-molded parts are coated with aluminum on a vacuum aluminum coating machine.

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Abstract

The invention relates to the field of automobile parts, in particular to a light-emitting diode (LED) reflecting mirror for an automobile, and a preparation method of the LED reflecting mirror. The preparation method provided by the invention comprises the steps of (1) carrying out vacuum drying on low-expansion and low-shrinkage polycarbonate (PC) material particles; (2) heating the dried particles for melting, and enabling the molten material to flow out of a spray nozzle and enter a mould; (3) after the molten material enters the mould, carrying out injection molding in a state of high mould temperature, wherein the mould temperature is 120-200 DEG C; then rapidly cooling the mould by introducing cooling water into the mould, wherein the cooling time is 10-200s. The LED reflecting mirror for the automobile is prepared from a low-expansion and low-shrinkage PC material, and a mould technology is combined with a high mould temperature technology, so that injection molding is directlyrealized, and the surface aluminizing is directly realized without needing paint; compared with BMC (bulk molding compound), the preparation method provided by the invention is simple in processes, short in production period and high in qualification rate, thus being suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of auto parts, in particular to an LED reflector for automobiles and a preparation method thereof. Background technique [0002] Automotive LED reflectors are responsible for the core function of LED light distribution. Therefore, the requirements for the dimensional accuracy and dimensional stability of the reflector are very high, so as to ensure that the light distribution performance can meet the requirements. [0003] There are two common ways to make LED reflectors. One is to use BMC materials, and then primer and aluminum plating after injection molding. The other is to use conventional PC materials, which are directly plated with aluminum after injection molding. The first BMC material is a thermosetting material with high temperature resistance up to 200 degrees Celsius and good dimensional stability. However, BMC materials cannot be directly plated with aluminum. A primer is required between the substrate a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/17B29C45/78B29B13/06B29B13/02B29L11/00
CPCB29C45/17B29B13/022B29B13/065B29C45/78B29C2945/76531B29L2011/0083
Inventor 文珍稀刘俊麟刘阳陈兆禹
Owner HASCO VISION TECHNOLOGY CO LTD
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