Selective chemical plating process and corresponding laser coatings and preparation method thereof

Abstract

The invention provides a selective chemical plating process. A laser coating is coated on the external surface of a plastic workpiece, and a step of doping a catalyst into plastic matrix resin is eliminated, so that cost is reduced, the application range is broadened, and the defects of low selectivity and the like caused by non-uniform mixing of the catalyst and the resin are overcome. A plurality of laser coatings suitable for the selective chemical plating process can meet the requirement of chemical plating in processes such as a laser direct line molding technology and the like, tolerate a high temperature and a strong acidic / alkaline environment, and can meet the requirement of reflow soldering to manufacture a product suitable for a surface mount technology (SMT) process; and a preparation method is convenient and quick, and easy to operate.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a coating capable of satisfying electroless plating. Background technique [0002] It is very convenient to manufacture three-dimensional circuit carriers by using laser direct line molding to manufacture part or all of the metallization of the surface. It only needs to use ordinary injection molding equipment, molds and technology to inject plastic parts, and then use laser to partially activate the circuit pattern on the plastic surface, and finally Covering by metal plating by chemical means is sufficient. [0003] In the above steps, partially activating the circuit pattern on the plastic surface with laser requires processing the plastic surface coating or adding special substances to ensure the selectivity of the activation. In addition, the solution used in electroless plating often has strong acid or alkali, so the plastic surface coating needs to have strong acid and alkali resi...

AI Technical Summary

Problems solved by technology

[0005]The use of direct laser activation and electroless plating of plastics has very high requirements for plastic substrates, and catalysts need to be added, but simply adding catalysts will change the physical and chemical properties of the original plastics, resulting in plastic The process requirements cannot be met, so it is necessary to adjust the composition of the plastic to achieve the physical and chemical properties of the plastic to meet the process requirements, which will result in high costs. In actual production, there are many types of plastics involved, and the physical and chemical properties of each plastic are different. There is a big difference, so for plastics with different properties, if you want to adjust their physical and chemical properties to the requirements of the electroless plating process by changing the composition, you need to dope them with different components and ratios. If you develop one by one for different plastics , then not only the work will be heavy, but also the cost will be high, which will bring more difficulties to R&D and production

In addition, in the process of injection molding, some special plastic parts will have defects such as excessively high or low material density due to defects in the injection molding process, such as uneven pressure or excessive water content, which will cause the plastic parts to fail to achieve chemical plating. Requirements, causing problems such as poor selectivity and unsatisfactory electroless plating effect

At the same time, this method is only suitable for plastic substrates, and it is difficult to perform on other substrates such as metal and wood.

Evenly applying special coatings on the surface of plastic substrates can solve the above problems, but traditional plastic surface coatings often cannot meet the requirements of selectivity and acid and alkali resistance at the same time

[0006]At present, most of the finishing lasers commonly used in the market use infrared lasers. The temperature rises to produce metamorphosis, melting, evaporation and other phenomena to achieve the effect of laser etching, but this method has poor processing accuracy and is easy to cause deformation of the workpiece

Ultraviolet laser is a low-thermal-efficiency laser. Its working principle is to break the chemical bonds in materials or surrounding media through high-load energy photons. It can be used as an ideal laser. However, ultraviolet laser equipment is expensive, poor in stability and high in maintenance costs. Difficult to apply in mass production