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What is the number of LED dead light in the end?(III)
- May 19, 2017 -

17.Solid crystal sticks dry

The encapsulant for silicone encapsulation contains a platinum (platinum) complex, which is very susceptible to poisoning. The toxicant is any of a nitrogen (N), phosphorus (P), sulfur (S) Compounds, once the curing agent poisoning, organic silicon curing is not complete, it will cause the linear expansion coefficient is high, the stress increases.

Packaging glue

18.Glue heat resistance is poor

According to our tests show that pure silica gel to 400 degrees began to crack, but added epoxy resin modified silicone heat resistance was pulled down to the level of epoxy resin, when the modified silica gel applied to high-power LED Or high temperature environment, there will be colloidal yellow hair black burst death lights and so on.

19.Glue dry

The encapsulant for silicone encapsulation contains a platinum (platinum) complex, which is very susceptible to poisoning. The toxicant is any of a nitrogen (N), phosphorus (P), sulfur (S) Compounds, once the curing agent poisoning, organic silicon curing is not complete, it will cause the linear expansion coefficient is high, the stress increases.

Such as Sn, Pb, Hg, Sb, Bi, As and other heavy metal ion compounds; containing ethynyl and other unsaturated groups of organic compounds; organic compounds containing N, P, S and other organic compounds; Note the following:

Organic rubber: Sulfur vulcanized rubber such as gloves

Epoxy Resin, Polyurethane Resin: Amine, Isocyanate Curing Agent

Integrated silicone RTV rubber: especially the use of Sn-like catalyst

Soft cyanide: plasticizer, stabilizer

Flux

Engineering plastics: flame retardants, enhanced heat resistance, UV absorbers and so on

Silver plating, gold-plated surface (the plating solution is the main reason)

Solder register degassing (caused by silicone heat curing)

20.The packaging line expansion coefficient is too large

In the use of cold and cold impact of the lamp in the environment, because of heat problems stress, the temperature changes in the environment will be more aggravated effect, the colloid itself has tensile strength and elongation, when the tension is over, then the colloid Cracked out.

21.Glue with chlorine

However, the current domestic production of epoxy resin production enterprises generally small, management and production process backward, the operating machinery is not high degree of automation, leading to the parameters of epoxy resin is difficult to protect. Low-quality production of epoxy resin and the status quo of China's current industry-related industries need to upgrade.

The chlorine in the epoxy resin not only scours the stencil plating layer, alloy wire or other active metal and chip electrode (aluminum reflective layer), but also can react with the amine curing agent to affect the curing of the resin. Chlorine content is an important physical index of epoxy resin, it refers to the epoxy resin contained in the mass fraction of chlorine, including organic chlorine and inorganic chlorine. Inorganic chlorine affects the electrical properties of the cured resin. The organochlorine content indicates the fraction of the chlorolauryl group in the molecule that does not undergo a closed loop reaction, and its content should be reduced as much as possible, otherwise it will affect the curing of the resin and the properties of the cured product.

In order to more efficient anti-electrode chlorine corrosion phenomenon, reduce the quality of the industry's risk, the world's exclusive to the LED manufacturers to launch "Kam Kam chlorine-free certification" testing services. "Kam Kam chlorine-free certification" is designed to confirm whether the LED glue and the chip contains excessive chlorine, detection accuracy to PPM level. The contents of the certification report can be found on the website. Gmatg. Com query. With the "Kam Kam chlorine-free certification" service, LED buyers can rest assured that the procurement of "Kam Kam chlorine-free certification," the raw materials, greatly reducing the risk of raw material procurement.

Gold Line

22.Copper alloy, gold alloy silver alloy wire, silver alloy wire instead of gold wire

Gold wire has the advantages of high conductivity, good thermal conductivity, corrosion resistance, good toughness, excellent chemical stability, etc., but the expensive gold line, resulting in packaging costs are too high. In the periodic table, the transition metal elements in gold, silver, copper and aluminum four kinds of metal elements with high conductivity. Many LED manufacturers trying to develop such as copper alloy, gold alloy silver alloy line, silver alloy wire to replace the expensive gold line. Although these alternatives are superior to gold wires in some properties, they are much worse in terms of chemical stability, such as silver and gold-clad silver alloy lines susceptible to sulfur / chlorine / bromide corrosion, and copper wires are susceptible to oxidation. In the case of encapsulated silica gel similar to that of a water-absorbing sponge, these alternatives make the bonding wire susceptible to chemical corrosion, light source

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