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Polyamide composition applicable to high-power LED

A polyamide composition and high-power technology, applied in the field of polyamide compositions for high-power LEDs, can solve the problems of poor yellowing resistance, insufficient material toughness, poor dimensional stability, etc., and achieve low water absorption and dimensional stability. Good, high viscosity effect

Inactive Publication Date: 2017-01-18
JIANGMEN DENGZHONGTAI ENG PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because polyamide products are easy to absorb water, have poor dimensional stability, and are prone to yellowing under high-power light irradiation, their service life is short
Although PA6T and PA10T have very good mechanical properties, their yellowing resistance is poor
PA9T has good yellowing resistance, but the material is not tough enough and is brittle, so the current polyamide products are mainly used in low and medium power LED equipment

Method used

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  • Polyamide composition applicable to high-power LED
  • Polyamide composition applicable to high-power LED

Examples

Experimental program
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Effect test

preparation example Construction

[0056] Preparation of semi-aromatic resin PA12T

[0057] 1) Add 4980g (30mol) of terephthalic acid, 6200g (31mol) of dodecyl diamine, and 33g of benzoic acid in sequence into a 20L autoclave equipped with magnetic coupling stirring, condenser, exhaust port, and pressure explosion-proof port , 33g sodium phosphate and 8kg deionized water;

[0058] 2) After reacting at 120°C for 5 hours, the temperature was raised to 220°C at a constant rate, and the pressure was kept constant for 10 hours;

[0059] 3) Reduce the pressure in the autoclave to 0.4MPa within 1 hour;

[0060] 4) Heat the high-purity nitrogen gas to 310°C and evenly pass it into the reactor for 3 hours, and discharge the material to obtain the required semi-aromatic polyamide (A) (PA12T). At 25°C, in 96% concentrated sulfuric acid, the measured reduced viscosity is 2.14dl / g.

[0061] Among them, PA6T / 66 resin: HTN 501 resin purchased from DuPont, USA; PA9T resin: N1000A resin purchased from Kuraray, Japan; PCT res...

Embodiment 1~5 and comparative example 1~3

[0063] The resin was first dried in a vacuum oven at 120°C for 4 hours, and then mixed according to the ratio listed in Table 1. Mix the other materials except white dye and enhancer evenly and feed them into the twin-screw extruder from the main hopper, add the enhancer from the first side feeder, and add the white dye from the second side feeder. After uniform kneading in the extruder, extrude, water-cool the strands, and then use a pelletizer to cut into columnar particles to obtain the desired polyamide composition. Then the polyamide composition was dried in a vacuum drying oven at 120° C. for 4 hours, and various standard samples were made into various standard samples with an injection molding machine for various performance tests. The test results are listed in Table 2.

[0064]

[0065]

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Abstract

The invention discloses polyamide composition applicable to a high-power LED. The polyamide composition comprises the following components in parts by weight: 100 parts of semi-aromatic polyamide (A), 10-100 parts of white pigment (B) and 0-2 parts of a silane coupling agent (C), wherein the semi-aromatic polyamide (A) comprises diamine: 80-100 mol% of dodecane diamine unit, and dibasic acid: 80-100 mol% of terephthalic acid unit; the white pigment (B) is at least one of TiO2, ZnS, ZnO, CeO2 and BaSO4. Through effective reduction in the density of amide groups in a molecular chain of the semi-aromatic polyamide in the composition, the composition itself has good anti-aging performance, low water absorption and good size stability. Compared with the conventional preparation method, the preparation method of the semi-aromatic polyamide in the composition is simpler and more efficient and the semi-aromatic polyamide prepared with the preparation method can achieve very high viscosity without being tackified any longer.

Description

technical field [0001] The invention relates to the field of chemical raw materials, in particular to a polyamide composition that can be used for high-power LEDs. Background technique [0002] As people have higher and higher requirements for energy saving, environmental protection and safety in recent years, the demand for new light sources with low power consumption, long service life and low operating voltage is increasing. LEDs are known for their low power, low operating voltage, and resistance to mechanical shocks. As such, it is replacing incandescent and other light sources in many applications and has found applications in such diverse fields as traffic signals, interior and exterior lighting, mobile phone displays, automotive displays, and flashlights. [0003] For LED components, it is generally required to have high light reflectivity, high whiteness, high dimensional stability, high mechanical strength, high heat deflection temperature, and high heat resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08K13/04C08K7/14C08K3/22C08K5/54C08G69/26C08G69/28
CPCC08K13/04C08G69/26C08G69/265C08G69/28C08K3/22C08K5/54C08K7/14C08K2003/2241C08L2203/20C08L77/06
Inventor 金良文
Owner JIANGMEN DENGZHONGTAI ENG PLASTICS CO LTD
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