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Epoxy resin characteristics and advantages and disadvantages of how to use?

Epoxy resin adhesive (epoxy resin adhesive) generally refers to the epoxy resin as the main body of the adhesive, epoxy resin gel should also include epoxy resin curing agent, otherwise the glue will not cure.

Epoxy resin is based on the epoxy resin on its basis for re-processing or modification, so that the performance parameters meet the specific requirements, usually epoxy resin glue also need to have a curing agent to use, and need to mix evenly After the complete curing, the general epoxy resin called A plastic or the main agent, curing agent called B plastic or curing agent (hardener).

First, epoxy resin is divided into soft and hard plastic

1, epoxy resin: it is a liquid type, two-component, soft from the dry-type soft, colorless, transparent, with flexibility, gently scratch the surface that is self-recovery prototype. Applicable to polyester, paper, plastic and other signs decoration.

2, epoxy resin: it is a liquid type, two-component hard plastic, colorless, transparent, suitable for metal plate can also produce a variety of crystal buttons, crystal bottle cap, crystal wood comb, crystal crafts, etc. High-end decorations.

Second, the characteristics of epoxy resin

1, the basic characteristics: two-component glue, need to AB mixed use, versatility, can fill a larger gap

2. Operating environment: room temperature curing, indoor and outdoor can be hand-plastic can also be used AB glue special equipment (such as AB glue gun

3. Applicable temperature is generally in -50 to +150 degrees

4. Suitable for general environment, waterproof, oil resistant, resistant to strong acid and alkali

5., placed in a cool place to avoid direct sunlight, shelf life of 12 months

Epoxy resin is based on the epoxy resin on its basis for re-processing or modification, so that the performance parameters meet the specific requirements, usually epoxy resin glue also need to have a curing agent to use, and need to mix evenly After the complete curing, the general epoxy resin called A plastic or the main agent, curing agent called B plastic or curing agent (hardener).

The main properties of epoxy resin before curing are: color, viscosity, specific gravity, ratio, gel time, usable time, curing time, thixotropy (stop), hardness, surface tension and so on.

The main characteristics of the properties of epoxy resin after curing are: resistance, withstand voltage, water absorption, compressive strength, tensile strength, shear strength, peel strength, impact strength, heat distortion temperature, glass transition Temperature, internal stress, chemical resistance, elongation, shrinkage coefficient, thermal conductivity, induced rate, weather resistance, aging resistance and so on.

Epoxy glue

Third, the advantages of epoxy resin:

(1) Epoxy resin contains a variety of polar groups and active epoxy groups, and thus with the metal, glass, cement, wood, plastic and other polar materials, especially the high surface activity of the material has a strong Of the adhesive force, while the epoxy curing of the cohesive strength is also great, so its high bonding strength.

(2) epoxy resin curing is basically no low molecular volatiles produced. The volume shrinkage of the adhesive layer is small, about 1% to 2%, which is one of the varieties with the lowest curing shrinkage in the thermosetting resin. After adding the filler can be reduced to 0.2% or less. The coefficient of linear expansion of the epoxy cured product is also small. So the internal stress is small, the impact of small bonding strength. In addition, the creep of the epoxy cured product is small, so the dimensional stability of the adhesive layer is good.

(3) Epoxy resin, curing agent and modifier variety, can be reasonable and clever formula design, so that the adhesive has the required process (such as fast curing, room temperature curing, low temperature curing, water curing, low viscosity , High viscosity, etc.), and has the required performance (such as high temperature, low temperature, high strength, high flexibility, anti-aging, conductive, magnetic, thermal conductivity, etc.).

(4) with a variety of organic (monomer, resin, rubber) and inorganic (such as filler, etc.) has a good compatibility and reactivity, easy copolymerization, crosslinking, blending, filling and other modifications to Improve the performance of the adhesive layer.

(5) good corrosion resistance and dielectric properties. Can acid, alkali, salt, solvents and other media corrosion. Volume resistivity 1013 ~ 1016Ω · cm, dielectric strength 16-35kV / mm.

(6) general-purpose epoxy resin, curing agent and additives of the origin, large output, simple preparation, can be pressed into a large-scale application.

Fourth, the epoxy resin defects:

(1) does not toughening, the curing agent is generally brittle, anti-peeling, anti-cracking, impact resistance is poor.

(2) Adhesive force for materials with low polarity (such as polyethylene, polypropylene, fluorine plastic, etc.) is small. Must be surface activated.

(3) some raw materials such as reactive diluents, curing agents have different degrees of toxicity and irritation. Design formula should be avoided when the selection, construction operations should be strengthened ventilation and protection.

Fifth, the scope of application of epoxy resin

1, epoxy resin clay for hydraulic structures over the surface of the impact of wear, anti-cavitation and anti-freeze-thaw protection, and damage after the repair;

2, for the concrete building defects repair and reinforcement and reinforcement treatment;

3, epoxy resin clay for the building beams, columns, pile cap and other cracks, concrete structures on the surface of the honeycomb, loopholes and dew and other defects;

4, epoxy resin clay for the aircraft runway, roads, bridges, tunnels, workshop mortar floor and other engineering parts of anti-wear and repair;

5, for steel structure and concrete bonding, bonding steel and sticky carbon fiber reinforcement to do the bottom leveling;

6, for chemical, oil, factories, terminals and other concrete or metal components of anti-acid salt corrosion protection and repair, sewage treatment pond, acid and alkali floor, FRP corrosion and other chemical anti-corrosion industry.

7, epoxy resin clay for underground pipes, hydropower stations, dams and other interfaces sealed anti-corrosion and repair reinforcement plugging.

8, granite, marble, acid-resistant tile (board) paving and caulking, sewage tank FRP lining anti-corrosion and so on.

Epoxy glue

Six, epoxy resin glue use

1. Use dry cloth or sandpaper to remove dust, oil, rust and so on, and then wipe with detergent such as acetone or trichlorethylene to clean the surface.

(A: B = 2: 1); in order to ensure the use of the effect, but also pumping a vacuum and then proceed to the same time, use.

3. Note that within the operating time must be exhausted, or will be solidified, resulting in waste of material, 24 hours after the maximum strength can be.

4. After coating at room temperature 2 to 6 hours curing 40 degrees to 50 degrees 1 to 3 hours curing; glue 24 hours after use; ten days after the sticky better. Cold and wet days, need 15 to 25 degrees room temperature bonding as well.

5, Adhesive face. Inverted surface. After the glue must be sticky paper stickers. Or 502 glue positioning. Epoxy Resin Adhesive Epoxy Resin AB is made of epoxy resin based two-component high temperature adhesive, mainly for high temperature metal, ceramic and other adhesive. The use of temperature operating temperature of -50 ~ + 180 ℃, short-term up to +250 ℃.

Epoxy resin is used in the use of more attention, and its use of a wide range, the use of relatively small operation, the operation is good, the effect is more obvious.

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Phone: 400-110-3188

Tel: 0750-2638288

Email: upr@hua-xun.com.cn

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