Nano Molding, refers to the Nano Molding Technology (NMT, Nano Molding Technology), is a metal and plastic with nanometer Technology combined with Technology, namely the first metal surface after nanoparticlization processing, plastic injection Molding directly on the metal surface, can let the metal and plastic forming an organic whole, can not only give attention to two or morethings metal texture, appearance also can simplify the product structure design, make the product more light, thin, short and small.
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Nanoforming technology is divided into two types based on the location of the plastic:
1, the plastic is not the appearance of one molding
2, plastic for the appearance of one molding
Applicable metal and resin materials:
• Aluminum, magnesium, copper, stainless steel, titanium, iron, galvanized sheet, brass;
• Aluminum alloys are adaptable, including 1000 to 7000 series;
• Resin including PPS, PBT, PA6, PA66, PPA;
• PPS has a particularly strong bonding strength (3000N/ C ㎡).
Several nano injection molding pretreatment technology
T treatment is a well-known nano injection molding pretreatment technology, but not only T treatment technology on the market, similar treatment technology and C treatment, B treatment, HK treatment, E treatment, PMH treatment, TRI treatment, etc..
T treatment: high production efficiency, suitable for stainless steel, aluminum alloy and MIM, suitable for complex structure parts.The use of a large number of strong acid and alkali pollution of the environment, not suitable for die casting aluminum, aging only one week.
E treatment: high production efficiency, high bonding strength, suitable for complex structural parts, suitable for extrusion aluminum and die casting aluminum, aging for more than one month.Not suitable for stainless steel and MIM
HK treatment: strong binding force, HK process is easy to control, the process is safe and environmental friendly, the plastic selection is diversified, and the metal plastic combination is stable in anodic oxidation.Suitable for profile aluminum and die-casting aluminum, aging more than one week.Not suitable for stainless steel and MIM
TRI treatment: high binding strength, suitable for complex structural parts, aging for more than a month, less chemicals used
The key question is, how do you get nano-holes on a metal surface?
Nano injection molding technology flow chart
As most light metal substrates aluminum, magnesium and zinc alloys do not have hard precipitates and grains, the acid solution is easy to erode nano holes. These holes are very small. As can be seen from the following figure, many 20~40nm holes grow on the inner wall of the large holes of about 100~150nm.
How can plastic and metal combine with such a small nano-hole?
Even if it was possible to make a metal substrate with nanopores on the surface, the plastic could not shoot into such small nanopores (it could not vent and could produce enveloping air), and there was no bonding capability at all, and the plastic structure immediately fell off.
After the acid etching of the metal substrate with T treatment agent, the plastic is injected to produce the reaction of lipid and amine, the two exchange and fuse, the nano-hole is soon "filled" by the two reactants, and the plastic structure immediately produces anchor bolt effect and fastens to the metal.
Advantages of nano injection molding technology
• NMT technology simplifies and shortens the manufacturing process;
• As a bonded magnesium alloy metal, reducing unnecessary surface treatment process;
• Because NMT is a safe and recyclable technology, it has little environmental impact.