What is the function of solder paste? What ingredients?

Flux pasteWhat is its function? What ingredients? Nowadays, with the rapid development of society, solder paste has become an indispensable flux. This product is widely used in many places, such as the electronics industry, digital industry, mobile, medical, etc., all of which require the use of this product. So, what is the role of solder paste in industry? How to judge and purchase it? The editor of JJY Solder Paste Factory will discuss it with you below:

The function of solder paste:

1Remove surface oxides

Due to the oxygen content in the atmosphere, various substances are actually surrounded by a layer of oxides, whose thickness is approximately2×10-9～2×10-8m. During welding, the oxide film will inevitably prevent the solder from wetting the base material, and the welding cannot proceed normally. Therefore, flux must be applied to the surface of the base material to reduce the oxide on the surface of the base material, thereby achieving the purpose of eliminating the oxide film. On the other hand, the high temperature during welding can easily cause the surface of the welding materials to be oxidized. Flux paste helps prevent the oxidation process.

2Reduce the surface tension of the material

The surface tension of a substance can affect the quality of welding. Another function of flux paste is to reduce the tension of the material. The surface tension of the molten solder will prevent it from flowing to the surface of the base material, affecting the normal wetting process. When the flux covers the surface of the molten solder, it can reduce the surface tension of the liquid solder, significantly improving the wettability.

Main components of flux:

AActivator(ACTIVATION)This component mainly serves to removePCBThe function of the oxide substance on the surface layer of the copper film pad and the welding part of the parts, and it also has the effect of reducing the surface tension of tin and lead. 

BThixotropic agent(THIXOTROPIC) This component mainly regulates the viscosity and printing performance of the solder paste, playing a role in preventing phenomena such as tailing and sticking during printing.

CResinRESINSThis component mainly serves to enhance the adhesion of the solder paste and also provides protection and prevention after solderingPCBThe effect of re-oxidation; This component plays a very important role in fixing the parts. 

DSolventSOLVENTThis component is the solvent of the flux component and plays a role in regulating uniformity during the stirring process of the solder paste, having a certain impact on the lifespan of the solder paste.

Shenzhen JJY has carried out mutually beneficial cooperation with electronic raw material producers. At the same time, it also produces solder wire, solder bar, solder paste and flux paste for other enterprises. With a rich variety of successful cases in the research and development of chemical raw materials, our overall strength has created a sales market that is of high quality and honest and trustworthy.