PP/PE/PC hollow profile sheet extrusion machine plastic surface chemical coating
DATE：2021/2/22 9:17:11 / READ： / SOURCE：This station
1. Basic principles and surface treatment
Chemical coating, mainly with the help of dissolved reducing agent, the solution of metal ions priority reduction on the surface of the object with catalytic activity, so as to form a healthy layer. In order to make the surface of plastic have catalytic activity, it must be phased, sensitized and activated before chemical coating. These processes are collectively referred to as surface treatment before plating. There are many methods of treatment, such as sensitization after coarsening, activation of silver ammonia, activation of palladium salt, direct activation of glue, or spraying conductive coating on the surface of plastic, steam, sintering and infiltration, etc., to form a catalytic layer. PP/PE/PC hollow profile sheet extrusion machine handern.com
The commonly used surface treatment methods before plating in the past are 1A-11A and 1B-9B, namely, removing oil, hot water washing concentrated sulfuric acid chemical roughing water washing + neutralization a sensitization water washing + activation water washing + reduction (degumming)→ water washing a chemical plating. These two methods have a long process and are difficult to control and operate. In particular, the rapid oxidation of the divalent ions in the sensitization solution and the easy mutual contamination between it and the activation solution make the solution unstable. The concentration of chromic acid in chemical roughing solution is high, and the wastewater treatment is difficult.
Parts "in addition to oil, swelling + drying a electroless plating" this - the latest process greatly reduced the chemical roughing liquid chromium anhydride content, and even with solvent swelling method to replace the chemical roughing, some of the roughing and activation and into a step.
(1) Chromic acid type coarsening and activation - one step method is shown in Table 12-38 PP/PE/PC hollow profile sheet extrusion machine handern.com
(2) Solvent - silver salt method This method is to make the plastic surface swell to achieve the purpose of coarsening, the formula and operation specifications are shown in Table 12-39.
The process flow is: oil removal (weak corrosion)→ water washing → swelling * water washing → solvent → silver salt treatment + drying →> solution washing → electroless copper plating
(3) Solvent - Palladium salt method, electroless copper or nickel plating can be done after the plating parts are treated with solvent and palladium chloride. Its solution stability is better than solvation-silver salt method, and its formula and operating specifications are shown in Table 12-40.
2* Formulation of Palladium Chloride 0.2Zg was dissolved in constant amount of concentrated hydrochloric acid (generally 0.4mL), and the human mixture was added with the main reddish-brown color. The pH value was 0.2. The calculated amount of CP-817B and CD-8212 was diluted to 1L.
(3) Electroless Cobalt Plating a layer of cobalt coating containing phosphorus or boron on polyester and other plastic strips, glass and plastic disks, which can be endowed with valuable magnetic properties. Therefore, electroless plating stations are used in the electronic computer industry to manufacture "memory" components.
Electroless cobalt plating and nickel plating are basically similar, the biggest difference is that electroless cobalt plating with phosphite reduction, can only be obtained in alkaline solution coating. The formula and process of electroless cobalt plating are shown in Table 12-43.
(4) electroless silver plating on plastic silver plating can produce reflectivity up to more than 92% of the mirror, widely used in electricity In the optical industry.
The stability of electroless silver plating solution is very poor, - the general silver plating solution can only be stabilized within 10~30 minutes, silver curtain liquid may be explosive substance a silver lightning acid, thus limiting the application of electroless silver plating in plastic electricity, there is no stable formula for this study of silver plating. Several formulations in Table 12-44 are for reference only.
3. Electroplating of plastic surface
PP/PE/PC hollow plate extrusion machinery
Main technological process
Electroless plating → water washing → bright acid copper plating + water washing activated a water washing bright nickel plating a water washing a passivation a water washing a hot water washing a swing dry coating a drying.
Chemical coating, mainly with the help of dissolved reducing agent, the solution of metal ions priority reduction on the surface of the object with catalytic activity, so as to form a healthy layer. In order to make the surface of plastic have catalytic activity, it must be phased, sensitized and activated before chemical coating. These processes are collectively referred to as surface treatment before plating. There are many methods of treatment, such as sensitization after coarsening, activation of silver ammonia, activation of palladium salt, direct activation of glue, or spraying conductive coating on the surface of plastic, steam, sintering and infiltration, etc., to form a catalytic layer. PP/PE/PC hollow profile sheet extrusion machine handern.com
The commonly used surface treatment methods before plating in the past are 1A-11A and 1B-9B, namely, removing oil, hot water washing concentrated sulfuric acid chemical roughing water washing + neutralization a sensitization water washing + activation water washing + reduction (degumming)→ water washing a chemical plating. These two methods have a long process and are difficult to control and operate. In particular, the rapid oxidation of the divalent ions in the sensitization solution and the easy mutual contamination between it and the activation solution make the solution unstable. The concentration of chromic acid in chemical roughing solution is high, and the wastewater treatment is difficult.
Parts "in addition to oil, swelling + drying a electroless plating" this - the latest process greatly reduced the chemical roughing liquid chromium anhydride content, and even with solvent swelling method to replace the chemical roughing, some of the roughing and activation and into a step.
(1) Chromic acid type coarsening and activation - one step method is shown in Table 12-38 PP/PE/PC hollow profile sheet extrusion machine handern.com
(2) Solvent - silver salt method This method is to make the plastic surface swell to achieve the purpose of coarsening, the formula and operation specifications are shown in Table 12-39.
The process flow is: oil removal (weak corrosion)→ water washing → swelling * water washing → solvent → silver salt treatment + drying →> solution washing → electroless copper plating
(3) Solvent - Palladium salt method, electroless copper or nickel plating can be done after the plating parts are treated with solvent and palladium chloride. Its solution stability is better than solvation-silver salt method, and its formula and operating specifications are shown in Table 12-40.
2* Formulation of Palladium Chloride 0.2Zg was dissolved in constant amount of concentrated hydrochloric acid (generally 0.4mL), and the human mixture was added with the main reddish-brown color. The pH value was 0.2. The calculated amount of CP-817B and CD-8212 was diluted to 1L.
(3) Electroless Cobalt Plating a layer of cobalt coating containing phosphorus or boron on polyester and other plastic strips, glass and plastic disks, which can be endowed with valuable magnetic properties. Therefore, electroless plating stations are used in the electronic computer industry to manufacture "memory" components.
Electroless cobalt plating and nickel plating are basically similar, the biggest difference is that electroless cobalt plating with phosphite reduction, can only be obtained in alkaline solution coating. The formula and process of electroless cobalt plating are shown in Table 12-43.
(4) electroless silver plating on plastic silver plating can produce reflectivity up to more than 92% of the mirror, widely used in electricity In the optical industry.
The stability of electroless silver plating solution is very poor, - the general silver plating solution can only be stabilized within 10~30 minutes, silver curtain liquid may be explosive substance a silver lightning acid, thus limiting the application of electroless silver plating in plastic electricity, there is no stable formula for this study of silver plating. Several formulations in Table 12-44 are for reference only.
3. Electroplating of plastic surface
PP/PE/PC hollow plate extrusion machinery
handern.com
Plastic parts after pretreatment, electroless plating, surface and attached to a layer of conductive metal film (generally 0.05~0.21m thick), but this layer of film can not meet the product in the anti-corrosion, decoration, wear resistance, heat resistance, conductive, welding and other requirements, but also must be electroplated by conventional electroplating methods required copper, nickel, chromium, silver, gold and other metals.Main technological process
Electroless plating → water washing → bright acid copper plating + water washing activated a water washing bright nickel plating a water washing a passivation a water washing a hot water washing a swing dry coating a drying.
Author：admin