What is the problem of the thickening of the curing agent in epoxy anticorrosive coatings?

The reaction is solidified, which is why most coatings are multi-component, and they need to be mixed and stirred in a certain proportion. There are no reinforcing agents.

The coating can be stored for a long time at room temperature after sealing and shading, and it can only be used as soon as possible with the addition of curing agent. After the paint is solidified with a curing agent, it cannot be used and can only be thrown away. Epoxy coal asphalt coating is used with the mixture, according to the proportion of the addition of curing agent, after mixing within 6 hours to be used, otherwise it will solidify can not be used.

Problems with too much curing agent in the paint:

1. More curing agent will speed up the drying speed of paint.

2. More curing agent will increase the hardness of the paint.

3. More curing agent will make the paint more wear-resistant.

4. More curing agent will reduce the flexibility of the paint.

Prone to cracking. Resin curing is an irreversible process of change in thermosetting resin through chemical reactions such as condensation, closed loop, addition or catalysis, and curing is completed by adding curing (crosslinking) agents. Curing agent is an indispensable additive, whether it is used as a binder, coating, castable must add a curing agent, otherwise epoxy resin.

It cannot be cured. Mixed polyisocyanates.

The main uses of curing agents and other related curing agents are paints, foams, coatings, etc. Among them, the closed water dispersible polyisocyanate curing agent can also be combined with melamine.

Assimilants are used to reduce costs with melamine curing agents and sealed water dispersible polyisocyanate curing agents to improve performance.

The variety of curing agent has a great impact on the mechanical properties, heat resistance, water resistance, corrosion resistance, etc. of the cured object, and the water resistance of aromatic anhydride cured epoxy resin is better than that of aromatic diamine and aliphatic polyamine curing agent; Sanya ethyltetramine curing agent has good alkali resistance, but acid resistance and formaldehyde solution resistance.

Less sexual.

Epoxy resin is a thermoplastic linear resin, and it can only be applied when the epoxy curing agent is added to generate a three-dimensional network structure to reflect its unique properties. Among the curing agent products, anhydride curing agent occupies an important position, and it is one of the varieties with a large amount of curing agent and a wide range of applications in the market. Epoxy resins and anhydride curing agents can be heated and then processed through various processing techniques to form thermosetting adducts in different forms.

The curing agent of the anhydride system is characterized by small shrinkage, no by-products, good heat resistance, good sealing, good insulation, and large selectivity of various additives. It can be used in electronic potting, electrical pouring, encapsulation, pultrusion, winding, laminating insulating materials and composite materials, powder coating and other fields.

1. Electronic potting.

Electronic potting products from small electronic components, precision instruments, military communication products, and a variety of electronic casting products large transformers, from motor coils to high-voltage electrical appliances in the current transformer, cable junction box and cable termination, etc., anhydride curing agents have been widely used.

2. Pultrusion products.

In pultrusion, continuous fiberglass bundles, belts or cloths impregnated with resin glue will be continuously produced with unlimited length under the action of traction. This process is suitable for the production of FRP profiles with various cross-sectional shapes, such as rods, tubes, I-shapes, troughs, square profiles and hollow profiles. In the production of pultrusion products, the curing agent of epoxy resin system generally uses anhydride curing agent.

Although unsaturated resin pultrusion is also used, its comprehensive properties, especially in terms of mechanical properties, insulation properties, and shrinkage, are inferior to epoxy resin pultrusion products.

3. Laminated products.

Epoxy laminated products are made of glue made of fiber fabric reinforcement impregnated with epoxy resin curing agent, etc., which are dried at a certain temperature to obtain a prepreg, which is cut and stacked, and then hot-pressed and cured into plates, which are wound and heated to solidify into pipes and cylinders. In the epoxy resin system used in laminated products, anhydride curing agents are mainly used, amine curing agents are dicyandiamide and aromatic amines, and synthetic resins are also used as curing agents. Epoxy copper clad laminate is the basic material of the electronics industry, which is used to manufacture printed circuit boards, which are widely used in electronic computers, communication equipment, instrumentation equipment, household appliances, etc.

4. Winding products.

Winding products are continuous fibers (cloth, impregnated yarn) impregnated with resin are wound to the mandrel according to a certain law, and then cured and demoulded to obtain a certain shape of the product. The most representative winding products are epoxy curing systems with long service life, low viscosity, less calorific value and less toxicity, so liquid anhydride is generally used.

Pro, the following method 1, base surface treatment: according to the specific situation for appropriate treatment, such as removing curing agents, oil stains, dust, building slurry, wall residues and removing loose materials left on the foundation surface. 2. Grinding with a grinder with 30, 100 mesh, 300 mesh resin grinding discs (wet grinding with water).

Grind 3-5 times depending on the ground conditions. The ground should be smoothed as much as possible, and the smoother the ground, the more ideal the effect in the later stage. Note:

Depending on the ground conditions, you can choose not to do 30 and 100 meshes. 3. After the ground is dry, spray Nalut lithium concrete sealing curing agent Hanjia (NA008 Hanjia) on the ground, apply evenly, and keep the surface moist for more than 20 minutes. 4. After the ground is dried, the ground is dry ground with a grinding machine with 500 and 1000 mesh grinding discs respectively.

Depending on the ground conditions, grind 3-5 times. 5. Spray the Nalu file Yinhong special lithium-based concrete sealing curing agent (NA008 Hanwire) on the ground, apply it evenly, and dry it sensitively. 5. Finally, use a high-speed polishing machine to dry polish the ground.

Summary. I once used an epoxy curing agent in a renovation, but due to improper operation, the result turned into a paste. Solution:

1.First of all, you should follow the instructions of the manual to operate correctly, ensure that the ratio is accurate, and the mixing is even, so as to avoid the phenomenon of paste. 2.

Secondly, attention should be paid to controlling the construction temperature, the construction temperature of the epoxy curing agent is generally between 5-35, beyond this range, it is easy to paste phenomenon. 3.Finally, attention should be paid to controlling the construction time, the construction time of epoxy curing agent is generally between 30-60 minutes, beyond this range, it is easy to paste phenomenon.

Extended content: In addition, during the construction process, attention should be paid to controlling the construction environment, and the construction environment of the epoxy curing agent should be kept dry and avoid moisture, so as to avoid the occurrence of paste.

I once used an epoxy curing agent in a renovation, but due to improper operation, the result turned into a paste. Solution:1

First of all, you should follow the instructions of the manual to operate correctly, ensure that the ratio is accurate, and the mixing is even, so as to avoid the phenomenon of paste. 2.Secondly, attention should be paid to controlling the construction temperature, the construction temperature of the epoxy curing agent is generally between 5-35, beyond this range, it is easy to appear paste and closing.

3.Finally, attention should be paid to controlling the construction time, the construction time of epoxy curing agent is generally between 30-60 minutes, beyond this range, it is easy to paste phenomenon. Extended Content:

In addition, during the construction process, attention should be paid to controlling the construction environment, and the construction environment of epoxy curing lycary agent should be kept dry and avoid moisture, so as to avoid the occurrence of slurry phenomenon in the form of cracking.

Excuse me, but please go into more detail?

There may be many reasons why the epoxy curing agent becomes a paste, the first of which may be because of the quality of the epoxy curing agent, such as the epoxy curing agent contains too much water, or the epoxy curing agent contains too many impurities, which will cause the epoxy curing agent to become a paste. In addition, the mixing ratio of the epoxy curing agent will also affect the performance of the epoxy curing agent, and if the mixing ratio is not appropriate, it will also cause the epoxy curing agent to become a paste. In addition, the storage environment of the epoxy curing agent will also affect the performance of the epoxy curing agent, such as the storage environment temperature is too high or the humidity is too high, which will also cause the epoxy curing agent to become a paste.

In short, in order to avoid the epoxy curing agent from becoming a paste, we must first ensure the quality of the epoxy curing agent, secondly control the mixing ratio, and finally ensure the storage environment of the epoxy curing agent.

Good afternoon, any two-component cross-linked sock with an excess of the corresponding curing agent will result in a decrease in mechanical and chemical properties. Epoxy monomer is the same hard monomer as styrene and phenolic, and excessive curing agents of aliphatic amines and aromatic amines will not only increase the brittleness of cross-linked epoxy after solidification, but also form retention in the three-dimensional network because more liquid amines than liquid amines that are not involved in cross-linking residues, and the acid resistance and solvent swelling resistance will be significantly worse. Under normal circumstances, it meets the standard or slightly less than the curing agent, and the effect is best when the limb is added quickly.

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