Plastic /metal bonding

Because of their high level of elasticity, which changes Uttle until a temperature of approx. 150°C is reached, these adhesives are particularly suitable for use with metal—plastic bonds exposed to wide temperature variations (compensation for dimensimial changes). 

The polymers of the 2-cyanoacryhc esters, more commonly known as the alkyl 2-cyaiioacrylates, are hard glassy resins that exhibit excellent adhesion to a wide variety of materials. The polymers are spontaneously formed when their Hquid precursors or monomers are placed between two closely fitting surfaces. The spontaneous polymerisation of these very reactive Hquids and the excellent adhesion properties of the cured resins combine to make these compounds a unique class of single-component, ambient-temperature-curing adhesives of great versatiUty. The materials that can be bonded mn the gamut from metals, plastics, most elastomers, fabrics, and woods to many ceramics. 

Brazing filler metal is carried on a plastic-bonded tape. ... 

ABS plastic, a polymer consisting of polybutadiene spheroids is dispersed in a continuous phase of poly(styrene—acrylonitrile). The chromic acid attacks the polybutadiene at a much higher rate than the continuous phase. This gives an excellent microroughened surface with superior metal-to-plastic bond strength. A typical recommended formulation consists of 20 vol % sulfuric acid, 420 g/L chromic acid, and 0.1—1.0% of a fluorocarbon wetting agent. The plastic is treated with this formulation for 6—10 min at 60—65°C. 

The excellent adhesion, high cohesion, low shrinkage on cure, absence of volatile solvents and low creep of the resins have led to important applications as adhesives, particularly for metal-to-metal and metal-to-plastics bonding. As with... 

Laminating is the process of adhesive bonding of layers of metal, plastic, or wood to form apart. 

Hydrocarbon polymers (HCP) are used not only as fuel components but also as binders of crystalline oxidizers and metal powders in the formulation of pyrolants, similar to composite propellants and plastic-bonded explosives. There are many types of HCP, the physicochemical properties of which are dependent on their molecular structures. The viscosity, molecular mass, and functionality of the poly-... 

The binder should be compatible with the other ingredients of the propellant, that is, oxidizer, metal powder, plasticizer, bonding agent, stabilizer and ballistic modifier etc. 

With two stabilizing groups on the carbon radical, polymerization becomes even easier. A famous example is SuperGlue , which is methyl 2-cyanoacrylate. The monomer in the tube polymerizes on to any surface (wood, metal, plastic, fingers, eyelids, lips,...) catalysed by traces of moisture or air, and the bonds, once formed, are very difficult to break. The intermediate radical in this polymerization is stabilized by both CN and CC Me groups. 

General purpose adhesive Adhesion to wood, stone, bricks, metals, plastics, ceramics Various bonding applications... 

These adhesives are structural adhesives and have found widespread use in both industrial and household environments. They are designed to bond metals, plastics, rubber, wood, glass and ceramics with thin or wide gaps. They display good water resistance and have good room temperature performance but are poor at elevated temperatures. The following is the simple urethane linkage structure ... 

In contrast to the young adhesives on synthetic bases, adhesives deriving from natural products have partly been known for millennia. The essential differences compared to reactive adhesives are the partially poor ageing stabilities in humid atmosphere as well as the low bonding strengths. They are not used for highly strained bonded joints of metals, plastics, glasses and similar. However, they record... 

Hazard class 1.1 rocket propellant, containing explosives such as NG, NC, and HMX, has been remanufactured into 2 lb booster charges used to initiate ammonium nitrate/fuel oil or slurry explosives. Plastic-bonded explosives have been granulated and reused to make charges for metal bonding and forming applications. 

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