News Details
Crosslinking agent for powder coatings
2017-8-29 12:21:31
Crosslinking agent for powder coatings is an important part of powder coatings. Powder coating of the crosslinking agent for paint will influence the production, storage and application, such as extrusion temperature, crosslinking time, crosslinking temperature and the flow property, impact resistance and hardness, storage stability, weather resistance, chemical resistance and so on.
It is sometimes difficult to distinguish between the crosslinking agents and resins of the powder coatings because the two components end up in a complete three-dimensional network structure. The low molecular weight compounds that are often considered to be small in the system and involve in crosslinking reactions are cross-linking agents.
But for some cases, such as polyester/epoxy mixed, especially 50:50, there is a question of what is cross-linking and what is resin.
So how bisphenol A epoxy resin and carboxylic acid polyester crosslinking agent of classification depends on the individual's hobby, or just say we epoxy/polyester powder coating is to choose matching epoxy resin and polyester resin crosslinking, epoxy and polyester as crosslinking agent, the crosslinking reaction is composed of epoxy resin of carboxyl pay couplet of epoxy resin and polyester resin membrane.
As the crosslinking agent of powder coating, the following conditions should be met:
(1) solid powdery, granular or thin sheet at normal temperature and high vitrification temperature;
(2) at normal temperature, it is required to have good latent ability. At medium and high temperature, it has the activity of good chemical reaction with resin, and no chemical reaction can occur with the facial filler and other auxiliaries.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
It is sometimes difficult to distinguish between the crosslinking agents and resins of the powder coatings because the two components end up in a complete three-dimensional network structure. The low molecular weight compounds that are often considered to be small in the system and involve in crosslinking reactions are cross-linking agents.
But for some cases, such as polyester/epoxy mixed, especially 50:50, there is a question of what is cross-linking and what is resin.
So how bisphenol A epoxy resin and carboxylic acid polyester crosslinking agent of classification depends on the individual's hobby, or just say we epoxy/polyester powder coating is to choose matching epoxy resin and polyester resin crosslinking, epoxy and polyester as crosslinking agent, the crosslinking reaction is composed of epoxy resin of carboxyl pay couplet of epoxy resin and polyester resin membrane.
As the crosslinking agent of powder coating, the following conditions should be met:
(1) solid powdery, granular or thin sheet at normal temperature and high vitrification temperature;
(2) at normal temperature, it is required to have good latent ability. At medium and high temperature, it has the activity of good chemical reaction with resin, and no chemical reaction can occur with the facial filler and other auxiliaries.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
(3) basic non-irritant and toxicity, the preparation of powder coating is basically non-toxic, which meets the standards of environmental protection safety;
(4) from the energy saving point of view, can and resin quickly crosslink at lower temperatures to form a satisfactory coating;
(5) the crosslinking agent should be colorless or light-colored, and can not color the film;
(6) good stability, easy to store and use; (7) good compatibility with resin system.
Types of thermosetting powder coatings
1. Thermosetting polyester powder coating
The properties of thermosetting polyester powder coatings are excellent in weathering and uv. Because the polyester resin with polar group, so the powder rate higher than epoxy resin, baking process not easy yellowing, high gloss, good flowing property, thick paint membrane, shallow features such as color, thus has the very good adornment sex. Generally used in refrigerators, washing machines, vacuum cleaners, meter shells, bicycles, furniture and other fields.
2. Thermosetting epoxy powder coating
Thermosetting epoxy powder coating of epoxy resin, crosslinking agent, pigments, fillers and other additives, is the earliest development of varieties of thermosetting powder coating, bonding strength, excellent and metal corrosion resistence, hardness, flexibility and impact strength, widely used in all walks of life.
3. Thermosetting polyurethane powder coating
The coating has a strong decorative property, smooth and smooth, and it is one of the best varieties of powder coatings in China.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
(3) basic non-irritant and toxicity, the preparation of powder coating is basically non-toxic, which meets the standards of environmental protection safety;
(4) from the energy saving point of view, can and resin quickly crosslink at lower temperatures to form a satisfactory coating;
(5) the crosslinking agent should be colorless or light-colored, and can not color the film;
(6) good stability, easy to store and use; (7) good compatibility with resin system.
Types of thermosetting powder coatings
1. Thermosetting polyester powder coating
The properties of thermosetting polyester powder coatings are excellent in weathering and uv. Because the polyester resin with polar group, so the powder rate higher than epoxy resin, baking process not easy yellowing, high gloss, good flowing property, thick paint membrane, shallow features such as color, thus has the very good adornment sex. Generally used in refrigerators, washing machines, vacuum cleaners, meter shells, bicycles, furniture and other fields.
2. Thermosetting epoxy powder coating
Thermosetting epoxy powder coating of epoxy resin, crosslinking agent, pigments, fillers and other additives, is the earliest development of varieties of thermosetting powder coating, bonding strength, excellent and metal corrosion resistence, hardness, flexibility and impact strength, widely used in all walks of life.
3. Thermosetting polyurethane powder coating
The coating has a strong decorative property, smooth and smooth, and it is one of the best varieties of powder coatings in China.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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