Requirements of the selection of LED outdoor display potting

Here, the author as Shenzhen Jin Technology Co., Ltd. Marketing Manager, follow the company has gone through more than five years to create experiences, but also as LED optoelectronic industry, potting, sealing, bonding, water moisture, insulation and other uses of materials - - silicone adhesive supplier, has written this article and you use the LED industry to pouring sealant manufacturers to share and exchange experiences in order to better serve the application of the line.


A, LED outdoor display of silicone encapsulants pay attention to the performance requirements


Silicone encapsulants from the use of terms, mostly used in outdoor environment, of course, special place, used in underwater or more humid environment. Therefore, the performance requirements of the most important is about research, "weathering", but with the weather resistance and has close ties directly to the key words are: adhesion, adhesion, tensile strength, flexibility, high and low temperature aging, acid-base environment and other specialized terms.


Weathering is mainly reflected in the potting materials use, in various environments, such as: constant temperature, constant temperature, constant humidity, and pH outdoor rain, sun, snow, etc., in addition, there are requirements for special purposes UV resistance and high thermal conductivity, high resistance However, the high performance requirements such as acid and base for many years under the application of the adhesive after curing can maintain stable and good adhesion, adhesion, tensile strength, flexibility, insulation, waterproof and so on.


Second, LED outdoor screen in the application process encapsulant, from the quality of the merits, the main phenomenon in which the performance of


Kam-adhesive technology as a joint research and development, production and supply business for nearly six years has passed away, especially in the service led display manufacturers a lot of potting applications, has accumulated more experience, the characteristics and quality of the glue grasp the advantages of very place, is very fine. Here, I will not distinguish between the merits of products, to further refinement, I put into excellent quality (high end), good (the end), ordinary (low), then Liepin substandard or whining unstable products.


Quality (high end) products: with high flexibility, high toughness, high tensile strength, high adhesion and adhesion properties, etc., the use of encapsulated products that can withstand the test of a variety of outdoor environments, after one or two years or more years, can maintain a very stable performance, and found that changes in shrinkage glue is very small. Of course, there is another high-end performance on the special requirements, that is attached to matte, thermal conductivity, flame-retardant properties of the.


Good quality (the end) products: with high-quality (high end) product comparison, has a good elasticity, flexibility, tensile strength, adhesion and adhesion properties, can withstand the test of a variety of outdoor environment, After a year or two or more years of time, can maintain good and stable performance, and glue shrinkage found little change.


Normal (low end) product: a certain degree of flexibility, softness, and has good tensile strength and the length of the tensile strength is not great, adhesion, adhesive strength is relatively good quality potting and low a grade, After over a year after the use of potting or years later, these products have significant shrinkage, shrinkage rate is higher, the lower the glue with the pure material, the cost is relatively cheap; the contrary, the shrinkage rate is smaller, more glue containing pure material high, the cost is relatively high. If the market because of vicious competition, reducing excessive material coupled with pure immature technology, it may not be easy to measure the quality of the security risks, such as: loss, silicon crack, break down stream oil and so on.


Third, LED optoelectronic industry more competitive as a hot industry, the relevant supply chain profit margins are kept compressed in the face of cost and profit, but also in quality issues, how to balance the selection of potting it?


1, the user's selection of potting the first consideration is quality, that is, stability, reliability, as the electronic chemical materials, mainly used in outdoor environmental, must withstand high temperature and low cold zone, pH rain, wind snow, sun, and so long-term test, to achieve what the effect of weathering, is the user-selected targeting criteria;


2, typically there are several location in the user


A, high-end, that is, the list usually exported to Europe, of course, the domestic high-end project, there are many high-end pouring sealant. High-grade potting material requirements, performance, stability, and weathering a long time, that is, high strength toughness, elasticity, tensile strength, adhesion, adhesive force have shown excellent long-term outdoor use, only a very small contraction may ;


B, in the end, in stretching, flexibility, toughness, adhesion, adhesive strength relative to the performance of a high-end low-grade, but the difference is not very clear, long-term outdoor use, has a smaller rate of contraction;


C, normal (low), the surface is characterized by soft rather than flexibility, a certain elasticity, can be described as soft elastic, stretching the length is quite good, but the tension is not hard, you can pull a certain length. Adhesion, adhesion also with PCB, lamp posts, Molded and other substrate materials stuck very well, but in the long-term outdoor weathering environments, will find the glue shrinkage rate change is obvious, if the water does not affect the display function and ignition of aging or long-term outdoor applications do not break down flow drip quality, standards can be said have already qualified.


3, failure, poor product, to be chosen. In the market, many adhesives electronic chemical manufacturers, immature technology, with little experience on the one hand, on the other hand is the raw material used in cheap, poor quality, in order to win a share in the market for products, low prices bid to enter the market, but after after a variety of environments using a variety of negative syndrome, such as: off side (with the plastic shell separation), debonding (separation and lamp posts), de-PCB (ie adhesion, by being too loose, dig dug a sense of a large block, no glue residue left end plate), colloidal broken loose, and even cracking of silicon rubber, in addition, aging lighting or outdoor environments, the material flow drop of oil to the module outside of decomposition. These phenomena are immature technology, poor selection of raw materials caused.


Fourth, high, medium, low glue, users choose the positioning of different market positioning is different, the selection of the most important principles?


Cost-effective, cost-effective production and is Kam Union adhere to the basic principles for the sake of users, tailored positioning for the user cost and profit balance, the development of market orientation in different directions. Kam Union to the current, LED outdoor screen potting product line is the line the most complete, cost-effective, even if an ordinary general-purpose, in the application is also very mature, stable, has been weathering the test of many years , especially in the northern areas of low temperature more apparent in cold zone of lasting durability and will not appear: from edge (with Molded separation), debonding (separation and lamp posts), off PCB (ie with focus, by being too soft, dig dug a sense of a large block, no glue residue left end plate), colloidal broken loose, and even cracking of silicon rubber, and the lighting after aging (sample a few modules, for less power aging 12 hours, 24 hours, 48 ​​hours or days) or outdoor use, the materials break down drop of oil to flow out of the bottom module and other undesirable phenomena.


V, Joint Science and Technology, Shenzhen Jin electronic chemical products as adhesives research and development, production suppliers, all the way with LED industry grow to maturity, but only as a kind of chemical materials LED electronic products, there is no reaction with other materials conflict phenomenon? Avoid or reduce this conflict and how?


As the electronic chemical materials, chemical materials to another if there is a chemical reaction of conflict is inevitable, resulting in such conflicts, the problem is not mainly in the glue on, but how to guide users how to avoid this conflict, and why there is such a reaction .


In fact, most conflicts in the plastic case to the elements, usually playing the nuts Molded pole fracture. Kam Union has experienced since entering this industry for nearly six years before the end of 2008, the occurrence of the reaction of glue and molded case simply does not exist, and in 2009, this kind of conflict increased, the market supply of all potting providers have experienced. Molded Health glue manufacturers than manufacturers lower the entry barrier, only four or so recipes, the most important is the choice of materials, plus the production process of other chemicals and mold temperature control, and the rationality of the mechanical structure, and so on. After 2009, companies house molded case students, in order to reduce costs, mostly recycled plastic, and even recycled materials to produce, and if these materials do not consider material performance parameters, such as: elastic, tension, acid and alkali resistance, high temperature, etc. material variety, the price advantage on the election, it produced no potting glue, use ordinary water to soak all easily corrupted, or even directly with the nut perfusion glue all incoming and outgoing burst phenomenon several times, but outdoor environment, not to mention the wind, snow, sun, acid rain and other conditions, long-term use it? Electronic chemical formula special glue materials were to go through dozens of combinations, attention is the harsh outdoor environment after use stability, weather resistance, including resistance to acid and alkali resistance, high temperature, etc., to maintain a stable performance of La stretching force, adhesion, adhesive strength, formulation, the difficulty of the difficulty is much higher than the molded case formulation, selection of raw materials not easily replaced. When the reaction of the glue and plastic containers, the user will generally have the following questions:


One question: Why use another model or another supplier of the glue did not respond, only occurs in this glue on it?


In fact, if good quality plastic material selection, structural mechanics to produce reasonable temperature stability, are generally not with the glue (including all types of glue or more family firms) reaction column fracture phenomenon, otherwise, the plastic package will meet the challenge of glue, It is also very risky, because, had to stand the test of many years of outdoor use of a variety of environments.


Misunderstanding number two: not suitable for use with this glue, this glue is used with the kit, is not the glue that section is not suitable for a quality problem?


No, if say, the user can also use different manufacturers to test the argument sub-plastic case, I believe, must have good material, good structure of the molded case for all the glue.


Three questions: Kam Union as a supplier of glue and plastic response is not likely than other family glue suppliers it?


This claim is unfounded because, Kam Union in recent years, efforts to build the brand, user impact, the market share of large, have many users, so using the user more, gave bad and the good hit, the normal probability of a large skilled, including plastic shell hit a variety of suppliers, the growth of our experience. Of course, we lose have lost customers, but also a serious effort to spend time looking for different plastic shell material to test, and ultimately find the answer. Abandoned with the user to choose the same price from our grade glue to the trial, too, there was this problem, let us answer this argument further.


Four questions: expensive high-end point of the glue, and the reaction was less plastic shell or not, they say?


Earlier I mentioned that we spent a long time to do molded case with glue test, the conclusion is the quality good enough, all the glue is applied molded case. Of course, the end of the glue, including high pure silicon materials, the cost is high, Kam associated companies producing high-end performance as the glue, but users want a cost-effective, lower cost point majority. End of the glue used in conjunction with more plastic case, but it can not be suitable for all materials produced by recycling plastic shell regeneration (which is a proven fact), on the contrary, a good selection, reasonable structure and stable production of molded case temperature can be different manufacturers for different types of glue.


In addition, electronic potting is not a single formula can be produced out of several materials, is to go through dozens of recipes and a variety of production processing, to complete the finished product, the general improvement in key performance met or stable, rarely go change, even if there is need to change, can only upgrade to the direction of a good improvement.


Solution: To avoid problems of conflict, how do we prevent it?


First, the glue selected to confirm the quality of the indicators of satisfaction with glue, such as: adhesion, adhesion, tensile strength, strength, aging or outdoor environment does not break down the oil flow, high temperature environments such as rain and sun does not appear off the edge , silicon rubber crack, performance remained stable.


Second, the choice of plastic, each molded case specifications (for example: P10 single red, P10 full-color, etc.) are the same type of glue to use small quantities of potting, the filling can be 100 or hundreds of plastic, covered with masks, screw on the nut.


Then, all of the normal aging process of firing 12 or 24.48 hours or a week, open the plastic mask column has broken. Such as normal, cover mask, screw the nut, sampling three or five days on the roof of exposure, freezing day in the refrigerator. In addition, the oven conditions, and can sample three or five on the oven temperature 80 ℃, a total of 8 hours.


Again, open the mask, is there plastic fracture, such as normal, then the material base through; but we need to do a thorough check that again after over a week re-check the small batch production is normal. If normal, it can be said that plastic can be used in large quantities. However, molded case to emphasize the production can not change suppliers to ensure materials and production process, may request from the purchase of 100 or more out to stay like.