Dow Corning printing type thermal gasket power LED lighting product development

First, the importance of thermal management in LED lighting system

High power LED products of about 20% input electric energy into light, converting the remaining 80% into heat, such as a large amount of heat can not be successfully derived, will make the LED chip junction temperature is too high, and affect the service life of the product, luminous efficiency and reliability. At the present stage, the heat dissipation of the LED lighting system is concentrated on the interface between the LED devices and the thermal conductive substrate, and then to the system board. Excellent performance of the interface thermal conductivity material can keep the LED heat dissipation channel smooth, so as to ensure the normal LED luminescence and service life.

With the rapid development of LED packaging technology, the power and light efficiency of LED packaging products are improved, which makes the LED lamp cooling to put forward new requirements for the interface thermal conductive materials.

1, high thermal conductivity: single power LED devices increases, more heat is generated, high temperature, thermal conductive materials require higher rates, currently on the market heat thermal interface material concentration ratio is 0.8W/mK to 3.5 W/mK, the main material is silicone material.

2, the operation is simple: the product can adapt to the production line, the operation process for manual or mechanical brushing process, in the shortest possible time to meet the test and sales requirements.

3, stable performance: LED lighting products in a long time, high temperature, thermal conductivity of material properties will not change, thermal conductivity, electrical insulation properties, adhesive properties, material color and other aspects will not change.

4, high cost performance: in the interface to maintain the thermal conductivity of products with superior performance, high quality, based on the ability to reduce the cost of customers, improve customer LED lighting products.

Figure 1 the Dow Corning printing type thermal gasket

Figure 2 complex shape base on precise dispensing

Dow Corning silicone, silicon-based technology and innovation of leading enterprises, the grand launch of new printing conductive gasket material, which is an innovative technology for heat management new trend in the development of LED lighting. Help LED lamps and lighting manufacturers more quickly and accurately controlled coated on a substrate with complex shape on the thickness of thermal conductive silicone compounds, while ensuring excellent heat transfer performance, reduce the cost of production (Figure 1 and Figure 2).

Two, the Dow Corning printing type thermal gasket advantage

The LED lamp using thermal interface material includes conductive adhesive, thermal grease and thermal gasket.

Heat conductive adhesive with adhesive, not easy to repair;

The various modes of operation, easy thermal grease can fast production equipment, can scrape very thin, so as to reduce resistance and save cost, but the effective life of life and cannot match the lamp; and will dry in long time under high temperature;

It has long service life and thermal gasket to repair multiple use, but containing glass fiber components, need to die before use, the processing of trouble and loss and the thickness ratio of grease, grease fitting is not good, will increase the thermal resistance, thereby reducing the heat conduction effect. And can not be used for the rapid production of equipment, which will directly or indirectly increase costs.

The advantages of the integrated thermal conductive gasket to overcome the shortcomings of the process, in order to meet the needs of customers. Advantages in performance:

1, a two-component liquid silicone material, heat curing silicone elastomer can become, by screen printing process or copper standard, or the standard dispensing equipment for printing, simple operation, convenient batch production.

2, according to the thermal conductivity and the adhesive layer thickness is different, the Dow Corning launched four products: the thermal conductivity of TC-4015 and TC-4016 products for 1.71W/mK; thermal conductivity of TC-4025 and TC-4026 products for 2.50W/mK. Among them, TC-4016 and TC-4026 were doped with glass beads to help control the thickness of the conductive layer.

3, the product has good dielectric properties, but also with plastic, aluminum, printed circuit boards and other common lighting substrate closely fit for the LED lighting system throughout the use of the cycle to provide a lower thermal resistance (Figure 3).

4, the product is liquid before curing, can achieve more rapid, precise dispensing operation, glue thickness control, especially for the complex shape of the substrate.

5, with the grease in operation is easy to operate and can fast production, blew very thin, good adhesion and other advantages, and has the advantages of long belt after curing die gasket service life and can repair etc..

Fig. 3 the change of thermal conductivity of the printed thermal conductive gasket under high temperature and high humidity (85 /85%) and hot and cold impact (-40 DEG C)

Three, Shenzhen Kay Technology Co., Ltd. to promote the success of the case of thermal conductive gasket

Shenzhen Kai, our technology Co. Ltd. as the Dow Corning electronic products the largest Chinese partners, not only provide high-quality sealing, thermal conductivity, coating materials such as silicone potting, and related equipment used for LED lamps and lighting customers, provide professional advice and services in the selection of products, applications, and share the successful experience of the new application materials with customers.

1, LED automotive lighting application success stories (Guangdong, O,)

The main challenges facing the automotive LED lighting is the thermal management scheme is effective, the traditional thermal interface materials has many defects: instantaneous large current drive led to LED device failure, the thermal resistance of thermal interface layer change work long time, under the condition of high temperature in the lamp of small molecule organic volatile substances increased, appeared in the smoky phenomenon (such as Figure 4). Daokang