内射人妻无码色AV,中文字幕九热精品视频在线,夜色视频精品区,老熟女不卡视频

Facing the future, Stick together, With faithfulness and sharing

Features of Cycloaliphatic Epoxy in LED Packaging Materials

Date:2022年11月25日Views:

Appliscation introdution

LED (Light Emitting Diode) components are widely used in large-size displays, traffic signals, lighting and other fields for their advantages of high efficiency, low power consumption, and high durability.Along with the rapid development of LED application technologies, the performance requirements for packaging materials are getting higher and higher.

Thermosetting epoxy resin, featuring good mechanical properties, low curing volume shrinkage, excellent adhesion force to substrates, and strong controllability of its operating processes, is one of the major packaging options for LEDs at present.Among them,cycloaliphatic epoxy resins, especially 3,4-epoxycyclohexyl-3,4-epoxycyclohexyl ester (TTA21), are preferably and widely applied in LED and optical device encapsulants for their excellent processability, high Tg point and good weather resistance.

It should be noted that cycloaliphatic epoxy resin features very high curing cross-linking strength, making it easy to cause cracks in the cured substance due to excessive internal stress, and limiting the product performance (during the packaging process, moisture absorption and mechanical stress are two main factors that affect the product reliability, where the mechanical stress is the product of curing stress and cooling stress that are caused by mismatching coefficients of thermal expansion (CTE)). In practical applications, they are usually paired with bisphenol A epoxy resin (or hydrogenated bisphenol A epoxy resin) to adjust the tenacity of the system. This article provides a brief analysis about the basic characteristics of resin matching for reference.

Comparison of basic characteristics

Viscosity-temperature Curves of TTA21 and E51 Epoxy Resins

E51:Bisphenol A epoxy resin, (epoxy equivalent of 184~194g/eq)

Structural formula

It can be seen from Fig that the viscosity of both resins declines with the rise of temperature. It should be considered in the formula design that the bisphenol A epoxy itself features a large viscosity and correspondingly larger viscosity changes.

Relationship between resin mixing ratio and viscosity

Relationship between the Mixing Ratio and the Viscosity of TTA21(25℃)

EP-4080:Hydrogenated bisphenol A epoxy resin, (epoxy equivalent of 205g/eq, and viscosity of 1800mPa·s)

Structural formula

It can be seen from Fig that when E51 and EP-4080 are mixed with an appropriate amount of TTA21, the viscosity of them both decreases significantly, and TTA21 may act as a high heat-resistant epoxy resin diluent.


Comparison of physical properties of anhydridecuring products in different epoxy systems

Curing system


Comparison of physical properties of anhydride curing epoxy resin products

It can be clearly seen that under the same conditions, the cycloaliphatic epoxy resin shows better heat resistance, while the bisphenol A epoxy resin has better performances in terms of water absorption and flexural strength.


Conclusions

Due to their good transparency and heat resistance, cycloaliphatic epoxy resins are suitable for the application of demanding LED epoxy encapsulants, which is in line with the market performances.

Featuring an obvious viscosity reduction effect in the formula, cycloaliphatic epoxy resins can pair with ordinary epoxy resins to effectively control the viscosity while improving the overall performances, thus leaving a larger space for operation.

Considering the differences in water absorption and mechanical strength, the formulation should be reasonably matched with the proportion of several epoxy resins according to the actual performance requiremnts.

Production advamtage

Recently, the Shandong base with an annual capacity of 9,500 tons has been put into operation, accelerating the release of TTA21 production capacity. As a leading enterprise of lipid-ring epoxy resin, Tetrahas always been committed to the development of new materials, contributing its own strength to the technological innovation and industrial upgrading of the industry.




a一级黄色片| 亚洲人人夜夜澡人人爽| 视频网站在线观看你懂的| 成人综合婷婷国产精品久久| 特黄aaaaaaaaa真人毛片| 综合欧洲在线| 日韩在线卡2卡3卡4卡5卡免费| 亚洲国产精品久久人人爱 | 日韩一区精品| 超碰秘无码一区| 福利电影99| 给个网站2021年直接进入的| 第一区第二区黄片| 91精品国产午夜福利在线观看| 91九色精品女同系列| 聂拉木县| 本一道WWWW| 在线亚洲欧美日韩精品专区| 伊人久久大香线蕉AV超碰演员| 美国黄片一区二区| 超碰av| 大片| www.亚洲欧美| 欧美一区公司| 精品人妻少妇一区二区三区| 午夜福利理论片高清在线第8季| wwwxxx| 五月综合一区中| 黄页免费观看| 浦城县| 亚洲爱爱网| 欧美视频不卡| 99热视| 香蕉在线观看视频精品欧美| 色五月激情五月亚洲综合| 一本大道综合久久精品| 先锋影音av在线| 精品人妻一区二区无码免费无码专| 国产精品内射| 操老熟女网址| 国产午夜无码福利在线看网站|