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News > Dynamic industry > Technology of LED packaging

Technology of LED packaging

As the title: I believe that the domestic LED packaging technology has made a lot of progress compared with foreign countries, but there are many problems in high folding LED packaging glue, the key to solve the problem is to put forward the problem, and think about the root cause of the problem.
1, the problem of high folding LED packaging glue:
1.1 after high temperature baking, the problem is troubled for a long time, it is suggested that the vinyl silicone resin is a result of vinyl reaction, the general baking process 80C/1hr+150C/3hrs, curing is not complete, once again after high temperature baking (250C/4hrs), the colloidal hardness is significantly increased, becoming hard and brittle. Solution: some people put forward in the formulation design, add linear vinyl silicone oil (straight chain type), can improve this problem, but also derived from other problems, the amount of silicone oil is small, improve the effect is not obvious, the amount of silicone oil is greater, the bond strength of the resin is particularly evident. After reflow, it will be de!
1.2 thermal shock performance is poor: Dow Corning products have not been tested, but domestic products can do 300Cycle (-40C/15min-100C/15min dies lamp, no degumming seemed to be not more than, factors affecting thermal shock performance of many, 1, the quality of semi-finished patch, the very obvious, with a glue, in the scaffolds with different performance difference is very big. 2. The factors that are related to the formulation design of the package, of course, this factor is also very complex, such as the use of the structure of the resin, molecular weight, molecular weight distribution affect the hardness, tensile strength, tear strength, and so on. But the main point is that the time of low hardness, good toughness, but the tear strength is poor, the effect of heat shock has been improved, which has been verified.
1.3 the absorption of moisture, and the specific performance of the colloidal curing block placed in a higher humidity, by the transparent and opaque, there is hair fog. It was unclear cause of this problem, but to be sure, with the use of tackifier resin or related. The hydroxyl content in the resin is too high? But I have tried a high content of silicone resin, curing block instead of the tide, which is very confused?
1.4 yellowing problem that yellow problem should have been solved by many, but due to the limitations of experimental conditions measured cannot be cured after a piece of yellow light transmittance, Dow Corning test conditions, 150C/7D, measuring a certain thickness of the solidified block the transmission rate of change, measure of yellow. Dow Corning patent, and yellow inhibitor, platinum catalyst, dosage, correlation.
1.5 tackifier problem, tackifier fog also solve a lot of, but also improve the cohesive force of the colloidal PPA and metal to, do some basic research, at present like products on the market and no more.

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