What is hardener used for? What is the use of hardener?

As a high-performance, high-value-added adhesive, epoxy resin adhesive is highly valued by the industry, but at the same time, counterfeit and shoddy products are often patronized. Therefore, we can identify it by the following chemical methods. Method 1:

The sample is dissolved in sulfuric acid, and then concentrated nitric acid is added, and a large amount of sodium hydroxide solution is poured into it. The second type: drop 5 drops of concentrated nitric acid on the resin adhesive film, move the reactant into the test tube after a few minutes, add 6ml of acetone and then add potassium hydroxide ethanol solution to make it alkaline, if it turns from red to purple, it indicates that it contains epoxy resin glue containing bisphenol A type, this method is also intuitive; Method 3:

Take the adhesive film or glue solution, p-phenylenediamine and 8ml of sample water, boil for 8min, if it is epoxy resin, the solution is peach....

As the name suggests, the curing agent plays a curing role, and the curing agent, also known as the hardener, curing agent or metastabilizer, is a kind of substance or mixture that enhances or controls the curing reaction. 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 need to add curing agent, otherwise epoxy resin can not be cured, the variety of curing agent has a great impact on the mechanical properties, heat resistance, water resistance, corrosion resistance and so on.

Curing agents can be divided into room temperature curing agents and heating curing agents according to their uses. Epoxy resins generally have excellent performance when cured at high temperatures, but coatings and adhesives used in civil engineering and construction need to be cured at room temperature due to difficult heating. Therefore, most of them use aliphatic amines, aliphatic cyclases and polyamides, especially the coatings and adhesives used in winter have to be used in combination with polyisocyanates, or polyliuols with foul odors.

Medium-temperature curing agents and high-temperature curing agents are selected based on the heat resistance of the substrate and the heat resistance, adhesion, and chemical resistance of the cured object. The focus of selection is polyamine and anhydride, which are widely used in electronics and electrical appliances because of their excellent electrical properties.

The adhesion of aliphatic polyamine solidifiers, alkali resistance and water resistance are excellent, and the aromatic polyamines are also excellent in chemical resistance, and have excellent rust prevention effect due to the hydrogen bond formed by the nitrogen element of the amino group and the metal. The higher the amine concentration, the better the anti-rust effect, the anhydride curing agent and epoxy resin form ester bonds, showing high resistance to organic and inorganic acids, and the electrical properties generally exceed polyamines.

The role of the curing agent.

1. Physical drying, paint reinforcing agent can speed up the drying speed of paint, speed up the drying speed of paint, and speed up the speed of construction.

2. Chemical curing, the curing agent and the main paint are fused together, which can improve the hardness, brightness and adhesion of the paint film, and also improve the chemical stability and anti-corrosion ability.

3. The curing agent can also improve the curing speed of the primer, when painting the paint, you need to wait until the base coat is completely dry before you can apply the topcoat, and this time may take about two or three days, with the curing agent can save time.

Curing agent, which is used to cure the bond of the adhesive and shrink the curing cycle.

Uses of curing agent:

1. One is physical drying: paint reinforcing agent can promote the rapid drying of paint and shorten the drying time.

2. One is chemical curing: the curing agent and the main paint react together, which can increase the hardness, brightness and adhesion of the paint film, and improve the chemical stability and anti-corrosion ability of the paint. It can make the paint film full and delicate, smooth and elastic, wear-resistant and not easy to scratch.

3. Accelerate the curing time of the primer, if the curing time of the primer is slow, it will also delay the time of the upper coat. If the time is not urgent, there are some primers that do not reinforce the chemical and need to wait for the primer to dry thoroughly before painting. So it's also a waste of time.

4. There is also a curing agent that can also accelerate the coating of primer and panel. Therefore, many wood paint three-in-one have necessary curing agents.

Curing agent, also known as hardener, setting agent or curing agent, is widely used in supermarkets, squares, parking lots, warehouses, industrial plants, etc., to make concrete permanently hardened, sealed and strengthened. What are the functions of the curing agent?

1. Easy to use: It is more convenient after use, simple to clean and maintain, rinse with clean water or moderate detergent.

2. Green and healthy: rest assured that the ground after green and healthy solidification is not toxic and will not volatilize harmful gases.

3. Increase aesthetics: It has a marble-like luster, making the ground more beautiful.

4. Increase service life: the use is longer, and the ground after curing treatment is harder, which increases the service life.

The above is all about the role of the curing agent, I hope it can help you.