Adhesive Knowledge
common terminology
bonding (adhesion) two substances on the surface chemical forces, physical force or both of the power of the state to make it together. Adhesives (adhesive) through the adhesive role of sticky material can be combined with substances. Structural adhesives (structural adhesive) used in structural parts of the adhesive force then, can withstand long-term allowable stress and the environmental effects of the adhesive. Primer (primer) in order to improve the bonding performance of adhesive glue before being coated with an adhesive material. Curing (curing) adhesive through chemical reactions (polymerization, crosslinking, etc.) to acquire and enhance the bonding strength of the performance process. Curing agent (curing agent) directly involved in chemical reactions, and to place curing adhesive material.
adhesive strength index
tensile strength (tensile strength) in the vertical load on the adhesive layer under the effect of bonding specimen damage, flat bonding surface of pouch belt tensile strength to withstand. Shear strength (shear strength) in parallel to the layer of the load, bonding specimen damage, flat bonding surface of the shear bear. Peel strength (peel strength) of the spin-off under the conditions specified, so that bonding separation unit width of the specimen can bear the load impact strength (impact strength) bonding the specimen to withstand shock loading and damage, the unit consumed by plastic junction the maximum power. Modulus (Modulus) modulus is by measuring the length of an object under load conditions change or deviation of the value of pvc mathematics to describe the amount of hardness.
mechanical theory
adhesive mechanism of mechanical theories, the adhesive must penetrate the gaps be sticky surface within the interface on the adsorption and exclude the air, can produce bonding effect. Adsorption theory, adsorption theory, adhesion molecules by the two materials contact and interface between the power generated caused. The main source of adhesion forces between molecules, including hydrogen bonding forces and van der Waals forces. Diffusion theory that the diffusion theory, bonding through the adhesive interface and being sticky material generated by molecular diffusion. Static theory because of sticky adhesive yoga material and being formed on double-layer interface, resulting from the electrostatic force, that is, the separation between the resistance. A weak boundary layer theory, a weak boundary layer theory that the damage was considered when pouch bonding interface damage, in fact often cohesive damage or destruction of a weak boundary layer. Weak boundary layer from the adhesive was sticky material, the environment, or among any combination. If the impurity concentration near the interface in the bonding, and adhesive material and being combined is not strong, and be sticky yoga material in the adhesive can occur within the weak boundary layer.
adhesive selection
usually the main consideration in the selection of adhesive factors: The bonding material,Chain Link Fence, bonding pieces of strength and durability requirements, bonding pieces of service requirements, bonding process, requirements, cost and other special considerations, and so on. Choose adhesive principle:
consider the types of bonding materials, the nature of the size and hardness;
consider bonding materials, the shape of the structure and process conditions;
consider the bonding area to bear the load and the form (tension, shear strength, peel strength, etc.);
consider the special requirements of materials, such as high temperature and low temperature thermal conductivity.
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