Carboxylic acid type coating crosslinking agent

Carboxylic acid type coating crosslinking agent,Used in epoxy resin, polyester or acrylic resin containing epoxy group of crosslinking. Used for polyester, epoxy resin powder coating crosslinked end carboxyl polyester also fall into this category, although the polyester resin may account for the main body in the coating.

End carboxyl polyester resin with epoxy cross-linking cross-linking, it could reduce the cost, epoxy resin coating corrosion resistance and water resistance, polyester resin can improve the flexibility of paint film and weather resistance. End carboxyl polyester synthesis generally divided into two steps, first synthesizing hydroxyl-terminated polyester, again USES the trimellitic anhydride esterification, further get end carboxyl polyester.

Small molecule acid anhydride substances such as phthalic anhydride, trimellitic anhydride in the presence of promoter can also serve as the crosslinking agent of epoxy resin, but with hygroscopicity strong, strong irritation to human body, such as insufficient rarely used in powder coating of the crosslinking agent.

Small molecular carboxylic acid as a typical representative of powder coating crosslinking agent is twelve carbon acid (dodecanedioicacid, DDDA). To it as the crosslinking agent acrylic powder coating is the best powder coating weatherability, can be used in the automotive paint. Reported that European SMART vehicles using acrylic powder coating.

Composed of hydroxyl and carboxyl linked organic compounds called carboxylic acid. The boiling point of saturated monocarboxylic acids and alcohols is higher than similar relative molecular mass. Formic acid and ethanol, for example, the relative molecular mass of the same, but the boiling point of ethanol is 78.5 ℃, and formic acid is 100.7 ℃.

Carboxylic Acid (RCOOH) (Carboxylic Acid) is the most important organic acids. A general formula for RCOOH or R (-cooh) group n compounds, functional group, - COOH. X-ray diffraction (XRD) has been proved that formic acid in the bond length of carbonyl 123 PM to 123 PM is longer than normal carbonyl; C - C of O bond length 131 PM less than alcohol - O bond length 143 PM; In formic acid crystals, both the carbon and oxygen key bond length is 127 PM.

For fat hydroxyl or aromatic carboxylic acid general formula of RCOOH R, respectively called fat (tribe) acid or aromatic acid (family). According to the number of carboxyl divided into one yuan acid and dibasic acid and polybasic acid. Also can be divided into saturated acid and unsaturated acid.

Acidic, react with bases to form salts. General reaction with phosphorus trichloride as chloride; Using phosphorus pentoxide dehydration, generate anhydride; Under the acid catalytic reaction with alcohol ester; React with ammonia to generate amide; Generated by four aluminum lithium hydride (LiAlH4) reduction of alcohol. By alcohol, aldehyde, unsaturated hydrocarbons, aromatic hydrocarbons, such as side chain of oxidation, hydrolysis or nitrile, or preparing methods of grignard reagent reaction with dry ice. Using the saponification from animal and plant oil or wax, can obtain 6 to 18 carbon atoms straight-chain fatty acid (family).




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).


Name is saturated fatty acids, including carboxyl carbon atoms, the longest carbon chain as the main chain, according to the main chain number of carbon atoms is called a acid, starting from the carboxyl carbon atom number. Unsaturated fatty acids when naming, main chain should be including the carboxyl carbon atoms and the carbon atoms of carbon carbon heavy key, the longest carbon chain, starting from the carboxyl carbon atom number, and indicate the location of the heavy keys.

Dibasic acid name is including two carboxyl carbon atoms, the longest carbon chain as the main chain, according to the main chain of the number of carbon atoms is called "a diacid.

Carboxyl directly on alicyclic carboxylic acid named, after can be in the name of alicyclic hydrocarbon plus "carboxylic acid or dicarboxylic acid suffix"; Carboxyl carboxylic acid name is fat on alicyclic hydrocarbon's name and the name of the fatty acids.

In addition, regardless of carboxyl even on alicyclic or even directly on alicyclic side chain, are named after alicyclic as substituent. Aromatic acid can be as fatty acids aromatic base replace content.

Saturated monocarboxylic acids, formic acid, acetic acid, propionic acid with strong acidity and excitement. Contains 4 ~ 9 C atoms with the stench of corruption, is oily liquid. With more than 10 C for paraffin wax solid.it, low volatile, has no smell.

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Diethyl toluene diamine(DETDA)  http://www.yaruichem.com