Epoxy resin adhesive can be classified according to its main composition, professional use, construction conditions and packaging form.

2019-03-15 1177
A variety of epoxy resin adhesives can be divided into soft adhesives and hard adhesives.
1. Epoxy Resin Soft Adhesive:
It is a liquid type, two-component, soft self-drying soft glue, colorless, transparent, elastic, slightly scratched surface is self-restoring. It is suitable for decoration of polyester, paper and plastics.
2. Epoxy Resin Hard Adhesive:
It is a liquid type, two-component hard glue, colorless and transparent. It is suitable for metal signs and can be used for making various high-grade decorations such as crystal buttons, crystal bottle caps, crystal wood combs, crystal crafts and so on.
The classification of epoxy resins has not been unified at present. Generally, there are 16 kinds of epoxy resins according to their strength, heat-resistant grade and characteristics. They include general adhesives, structural adhesives, heat-resistant adhesives, low temperature-resistant adhesives, underwater adhesives, wet surface adhesives, conductive adhesives, optical adhesives, spot welding adhesives, epoxy resin film, foaming adhesives, strain adhesives, soft material adhesives, sealants, special adhesives, underwater adhesives There are 16 kinds of solidified adhesives and civil building adhesives.
The classification of epoxy resin adhesives in the industry has the following categories:
1. According to its main composition, it can be divided into pure epoxy resin adhesives and modified epoxy resin adhesives.
2. According to its professional use, it can be divided into mechanical epoxy resin adhesives, building epoxy resin adhesives, electronic eye epoxy resin adhesives, repairing epoxy resin adhesives, transportation adhesives and marine adhesives.
3. According to its construction conditions, it can be divided into room temperature curing type, low temperature curing type and other curing type.
4. According to its packaging form, it can be divided into one-component type, two-component type and multi-component type.
There are other methods, such as solvent-free adhesive, solvent-based adhesive and water-based adhesive. However, component classification has been widely used.
1. Basic characteristics: Two-component glue, which needs AB mixing, has strong versatility and can fill large voids.
2. Operating environment: room temperature curing, indoor and outdoor can be used, manual mixing can also use AB special equipment (such as AB rubber gun).
3. The applicable temperature is generally - 50 to + 150 degrees.
4. Suitable for general environment, waterproof, oil-resistant, strong acid and alkali-resistant.
5. Place in a cool place to avoid direct sunshine. The shelf life is 12 months.
1. Epoxy resin adhesives are reprocessed or modified on the basis of epoxy resin to meet specific requirements in terms of performance parameters. Usually, epoxy resin adhesives need to be mixed with curing agents before they can be fully cured. Generally, epoxy resin adhesives are called A adhesives or main agents, and curing agents are called B adhesives or curing agents (hardeners).
2, the main characteristics of epoxy resin before curing are: color, viscosity, specific gravity, ratio, gel time, time to use, curing time, thixotropy (flow arrest), hardness, surface tension and so on.
Viscosity: refers to the internal friction resistance produced by colloids in the flow. Its value is determined by the type of substance, temperature, concentration and other factors.
Gelation time: the curing of glue is the process of conversion from liquid to curing. The time from the beginning of glue to the critical state of colloid toward solid is gel time, which is determined by the mixing quantity and temperature of epoxy resin.
Thixotropy: This characteristic refers to the phenomenon that when the colloid is touched by external force (shaking, stirring, vibration, ultrasound, etc.), the colloid becomes thicker and thinner with the external force, and when the external factors stop working, the colloid returns to its original consistency.
Hardness: refers to the materials resistance to imprint, scratch and other external forces. According to the test methods, there are Shore hardness, Brinell hardness, Rockwell hardness, Mohs hardness, Barcol hardness, Vichers hardness and so on. The value of hardness is related to the type of hardness tester. Among the commonly used hardness testers, Shaw hardness tester has simple structure and is suitable for production inspection. Shaw hardness tester can be divided into A type, C type and D type, A type is used to measure soft colloid, C and D type is used to measure semi-hard colloid and hard colloid.
Surface tension: The attraction of molecule in liquid makes the molecule on the surface under an inward force, which makes the liquid minimize its surface area and form a force parallel to the surface, called surface tension. In other words, the mutual traction force in unit length between two adjacent parts of the liquid surface is a manifestation of molecular force. The unit of surface tension is N/. The surface tension is related to the properties, purity and temperature of the liquid.
3. The main characteristics of epoxy resin after curing are resistance, voltage resistance, water absorption, compressive strength, tensile strength, shear strength, peeling strength, impact strength, thermal deformation temperature, glass transition temperature, internal stress, chemical resistance, elongation, shrinkage coefficient, thermal conductivity, inductivity, weathering resistance and aging resistance.
Resistivity: Surface resistance or volume resistance is usually used to describe the resistance characteristics of materials. Surface resistance is simply the value of resistance measured between two electrodes on the same surface in the unit of_. The surface resistivity per unit area can be calculated by combining the shape of the electrode with the resistance value. Volume resistance is also called volume resistivity and volume resistivity coefficient. It refers to the resistance value through material thickness. It is an important index to characterize the electrical properties of dielectrics or insulating materials. Represents the resistance of 1 cm 2 dielectrics to leakage current in units of_? M or_? Cm. The greater the resistivity, the better the insulation performance.
Proof voltage: also known as voltage strength (insulation strength), the higher the voltage applied at both ends of the colloid, the greater the electric field force on the charge in the material, the easier the ionization collision occurs, resulting in colloid breakdown. The minimum voltage that breaks down an insulator is called the breakdown voltage of the object. When breaking down an insulating material 1 mm thick, the voltage kilovolts needed to be added are called the insulating voltage withstanding strength of the insulating material, referred to as the withstanding voltage, in units of Kv/mm. The insulation properties of insulating materials are closely related to temperature. The higher the temperature, the worse the insulation performance of insulating materials. In order to ensure the insulation strength, each insulating material has an appropriate maximum allowable working temperature. Under this temperature, it can be used safely for a long time. Over this temperature, it will rapidly aging.
Water absorption: A measure of the degree of water absorption of a substance. It refers to the percentage of mass increased by soaking the substance in water for a certain time at a certain temperature.
Tensile strength: Tensile strength is the maximum tensile stress when the colloid is stretched to fracture. They are called tensile force, tensile strength, tension resistance and tensile strength. The unit is MPa.
Shear strength: also known as shear strength, refers to the maximum load that can be sustained parallel to the bonding area per unit of bonding area, commonly used in units of MPa.
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