Analysis of the properties, advantages and disadvantages and scope of application of epoxy resin glue

Epoxy resin adhesive generally refers to epoxy resin as the main body of the adhesive, epoxy resin glue should generally include epoxy resin curing agent, otherwise the glue will not cure.
Epoxy resin glue is based on epoxy resin on the basis of its properties for reprocessing or modifiing, so that its performance parameters and other in line with specific requirements, usually epoxy resin glue also needs to have curing agent matching to use, and need to mix evenly before full curing, general epoxy resin glue called A glue or main agent, curing agent called B glue or curing agent (hardener).
1, epoxy resin glue is divided into soft glue and hard glue
1, epoxy resin soft glue: it is a liquid type, two-group, soft self-drying type soft glue, colorless, transparent, elastic, light scratching surface that is self-restoring the original . Suitable for polyester, paper, plastic and other sign decoration.
2, epoxy resin hard glue: it is a liquid type, two-part hard glue, colorless, transparent, suitable for metal signs can also produce a variety of crystal buttons, crystal caps, crystal combs, crystal crafts and other high-end decorations.
II, epoxy resin properties
1, basic characteristics: two-part glue, AB mixed use, versatility, can fill a larger gap
2., operating environment: room temperature curing, indoor and outdoor Can be, can be hand-mixed glue can also use AB glue special equipment (such as AB glue gun
3., the applicable temperature is generally in -50 to 150 degrees
4., suitable for the general environment, waterproof, oil-resistant Strong acid and alkali
5., placed in a cool place to avoid direct sunlight, shelf life of 12 months
epoxy resin glue is based on epoxy resin on the basis of its properties for reprocessing or modifiing, so that its performance parameters, etc. In line with specific requirements, usually epoxy resin glue also needs to have curing agent matching to use, and need to mix evenly before full curing, general epoxy resin glue called A glue or main agent, curing agent called B glue or curing agent (hardener).
reflects the main characteristics of epoxy resin before curing are: color, viscosity, specific gravity, ratio, gel time, use time, curing time, tentacle (stop flow), hardness, surface strength and so on.
the main characteristics that reflect the properties of epoxy resin after curing are: resistance, voltage resistance, water absorption rate, pressure strength, stretch (lead) strength, shear strength, peeling strength, impact strength, thermal deformation temperature, glass transition temperature, internal stress, chemical resistance, elongation, shrinkage coefficient, thermal conductivity, induction rate, weather resistance, aging resistance and so on.
3, epoxy resin advantages:
(1) epoxy resin contains a variety of polar groups and very active epoxy base, so with metal, glass, cement, wood, plastic and other polar materials, especially high surfactant material has a strong bonding, while epoxy curing material cohesion strength is also very large, so its glue strength is very high.
(2) epoxy resin curing is largely free of low molecular volatiles. The volume shrinkage of the glue layer is small, about 1% to 2%, and it is one of the species with the smallest curing shrinkage in thermostate resin. When fillers are added, they can be reduced to less than 0.2%. The line expansion coefficient of epoxy curing is also very small. Therefore, the internal stress is small, the effect on the glue strength is small. In addition, the creep of epoxy curing is small, so the size stability of the glue layer is good.
(3) epoxy resin, curing agent and modifier variety, through reasonable and ingenious formulation design, so that the adhesive has the required process (e.g. rapid curing, room temperature curing, low temperature curing, water curing, low viscosity, high viscosity, etc.), and has the required performance (e.g. high temperature, low temperature, high strength, high flexibility, aging, conductive, magnetic conductivity, etc.).
(4) and a variety of organic matter (monomer, resin, rubber) and inorganic (e.g. fillers, etc.) have a good compatibility and reactive, easy to co-converged, cross-linking, mixing, filling and other modified to improve the performance of the glue layer.
(5) corrosion resistance and dielem performance is good. It is resistant to corrosion of acids, alkalis, salts, solvents and other media. Volume resistivity 1013 to 1016 s cm, dielectric strength 16-35kV/mm.
(6) general-purpose epoxy resins, curing agents and additives of the origin of many, large production, easy preparation, contact with pressure molding, can be applied on a large scale.
, epoxy resin glue shortcomings:
(1) does not strengthen, curing material is generally brittle, anti-peeling, anti-cracking, poor impact performance.
(2) small bonding to materials with low polarity (e.g. polyethylene, polypropylene, fluoroplastics, etc.). Surface bio-processing must be carried out first.
(3) some raw materials such as active thinners, curing agents, etc. have varying degrees of toxicity and irritation. The design of the formula should try to avoid the selection, construction operation should be strengthened ventilation and protection.
V, epoxy resin glue applicable range
1, epoxy resin glue is suitable for waterworks building overflow surface anti-flush wear, anti-air corrosion and anti-freeze melt protection, as well as damage repair;
2, for the repair of defects in concrete buildings, as well as reinforcement and reinforcement treatment;
3, epoxy resin glue is suitable for building beams, columns, piles, such as cracks, concrete structure surface honeycomb, loopholes and exposed defects treatment;
4, epoxy resin glue is suitable for airstrips, roads, bridges, tunnels, workshop mortar flooring and other engineering parts anti-wear and repair;
5, suitable for steel structure and concrete bonding, bonding steel reinforcement and adhesive carbon fiber reinforcement when doing bottom leveling;
6, used in chemical, petroleum, factory, dock and other concrete or metal components anti-acid and alkali corrosion protection and repair, sewage treatment tanks, acid-alkali ground, FRP corrosion prevention and other chemical anti-corrosion industry.
7, epoxy resin glue is suitable for underground pipes, hydropower stations, dam-based and other interfaces of sealing corrosion prevention and repair reinforcement to plug leaks.
8, granite, marble, acid-resistant tiles (plates) of the paving and seams, sewage tank FRP lining corrosion protection.
, epoxy resin glue use method
1. Use dry cloth or sandpaper to remove dust, oil, rust, etc. from the subsequent surface and wipe it with a cleaning agent such as acetone or tachloroethylene to clean the subsequent surface.
2. Unscrew the front cover, according to the above instructions to take the weight ratio of A agent plus B agent can be fully stirred evenly to use (A:B s 2:1); In order to ensure the effect of use, a vacuum can also be vacuumed for re-use.
3. Note that it must be used up within the operational time, otherwise it will solidify, resulting in waste of material, after 24 hours can get the highest strength.
4. After applying glue. 2 to 6 hours at room temperature curing 40 degrees to 50 degrees 1 to 3 hours curing; 24 hours after the application of glue; Ten days later, the stickiness is better. Cold and humid day, need 15 to 25 degrees room temperature bonding as well.
5, bonding straight. When hanging upside down. Stickers must be posted with stickers after applying glue. Or use 502 glue to locate. Epoxy resin formula epoxy resin AB glue is a two-part high temperature adhesive based on epoxy resin, mainly suitable for high temperature metal, ceramic and other glue. Its operating temperature is -50 to 180 degrees C, and in a short period of time it can reach -250 degrees C.
epoxy resin glue is in use is more need to pay attention to, its use range is wide, the use of the operation is relatively fine, the operation is good, the effect is more obvious.
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