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Anonymous users2024-02-16As 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....
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Anonymous users2024-02-15The curing agent used for the curing of epoxy resin at room temperature is mainly amine modified amine curing agent, commonly used aliphatic amines (ethylenediamine, diethylenetriamine, triethylenetetraamine, tetraethylenepentamine, polyethylenepolyamine, etc.), alicyclic amines (isophoronediamine, diaminodicyclohexylmethane, methylcyclopentanediamine, diaminemethylcyclohexanediamine, etc.), aromatic amines (isophthalenedimethylamine, diaminodiphenylmethane, etc.), modified amines (650 low molecular weight polyamide, 651 low molecular weight polyamide, T31 curing agent, 593 curing agent and so on).
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Anonymous users2024-02-14There are many types of epoxy resin curing agent, it is a kind of reticular three-dimensional polymer that can react with epoxy resin to form a network of solid polymer, this epoxy resin curing agent also has certain toxins, so special care should be taken when using it. Today I will introduce to you the types of epoxy hail trace resin curing agents. I hope you can have some understanding of the types of epoxy resin curing agents through the introduction.
Latent epoxy curing agent.
1. Latent epoxy resin curing agent.
The scope of use of epoxy resin curing agent is different, which leads to the fact that according to the requirements of various fields, the corresponding epoxy resin curing agent used is also different, and if the epoxy resin curing agent is used incorrectly, then the epoxy resin will not cure. First of all, I would like to introduce the latent epoxy resin curing agent. The performance of this latent epoxy resin curing agent is relatively stable under general conditions.
Only when its temperature rises at a certain height, it will show its activity, so as to cure with epoxy resin, this latent epoxy resin curing agent has dicyandiamide, it shows the characteristics of this latent curing agent, it is relatively stable at room temperature, will not produce curing, when the temperature is 145-165 °, it will produce curing within 30 minutes.
2. Visible epoxy resin curing agent.
Visible epoxy curing agent.
Visible epoxy resin curing agent is a kind of curing agent that commonly uses epoxy resin, when using this visible epoxy resin curing agent, we must pay attention to the use of energy to be appropriate, when using this epoxy resin curing dose is relatively small, the fixed line product will be connected to the epoxy group without reaction, if the use of too much energy, it will lead to a particularly fast curing speed, will not achieve the expected effect. The epoxy resin curing agent belonging to this obvious type has adipic acid diacyl hydrazide, which will not be soluble in epoxy resin at room temperature, and will be cured under the dissolution of high temperature environment.
3. Catalytic epoxy resin curing agent.
The catalytic epoxy curing agent can be activated by the epoxy resin we use, and when we turn on the epoxy machine, we can apply the catalytic epoxy resin and combine it into a network structure. Let's talk about the curing agent that will be added to the epoxy resin, also known as the melon-shaped curing agent, which can have an addition reaction with the epoxy group.
Catalytic epoxy curing agent.
Remind everyone to ensure the cleaning and hygiene of the site when using, and at the same time wash your hands and face in time, or if it is exposed to the outside **, if it accidentally gets into your eyes, you must immediately go to the hospital for treatment.
The more hardener, the longer the curing time.
Types, commonly used epoxy resin curing agents are aliphatic amines, aliphatic amines, aromatic amines, polyamides, anhydrides, resins, tertiary amines, and ultraviolet rays or light can also cure epoxy resin under the action of photoinitiators. Amine curing agents are generally used for normal temperature or low temperature curing, and acid anhydride and aromatic curing agents are commonly used for heating curing. Dosage, (1) amines are calculated as follows when amines are used as crosslinkers: >>>More
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: >>>More
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