News Details
Polyphenol coating crosslinking agent
2017-8-31 23:01:06
Polyphenol coating crosslinking agent has a special long carbon chain dendritic polymer, and the reaction group is phenolic group.
Main properties of polyphenol crosslinking agent:
(1) good compatibility with epoxy resin. The structural and bisphenol A epoxy resin are closer and the softening point is 85. - 120? ;
(2) it needs to be used in conjunction with accelerant. The most commonly used economic promoter currently is 2-methylimidazole.
(3) coating adhesion, flexibility, impact resistance, high brightness, leveling and anticorrosive properties.
(4) non-toxic. It can be used in direct contact with food and drinking water.
Since the resin contains a weak acid hydroxyl group, it can provide active hydrogen and epoxy resin to produce crosslinking after the activation of a small number of mimidazolated catalysts. Plus it and epoxy resin has almost the same chemical structure, has good compatibility with each other, and dissolve performance, won't produce after crosslinking structure damage caused by the different shrinkage rate, so as to retain the can give all the performance of epoxy resin, such as excellent adhesion, coating compactness, chemical resistance and solvent resistance, etc. So polyphenol crosslinking agent is a kind of excellent epoxy resin crosslinking agent.
The phenolic resin used as the crosslinking agent of powder coatings has encountered several shortcomings, and the resistance of the system to yellowing is quite poor, which makes them unsuitable for the production of white powder coatings. The presence of aromatic ether groups significantly reduces their anti-uv linearity, so that their application fields are confined to indoor areas.
Most of the epoxy resin producers have developed the phenol crosslinking agent which is specially designed for them. All phenol crosslinking agents have almost the same hydroxy equivalent, both between 240-260 and a lower softening point, usually 65? - 75? Between them, they have a very low melt viscosity, 150? Is usually less than 1Pa? S, in most cases 100mPa? S - 400 mpa? S.
Producers usually introduce crosslinking catalysts during the manufacture of phenolic crosslinking agents. They provide products with different reactive levels of activity for the market, and often provide quick crosslinked products with 1min / 230? 15 min / 150? Although the reaction activity is high, the powder coating of the preparation can be satisfied with the storage stability.
Chinese name: Diethyl toluene diamine(DETDA)Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
An organic compound formed directly by the hydroxyl group (-oh) with the aromatic nucleus (benzene or the thick benzene ring).
Hydroxy directly and aromatic nucleus (benzene or thick benzene) sp2 hybridization of carbon atoms linked molecules called polyphenols, this structure has similarities with fat enol, nothing will happen tautomerism, called interconvert phenol type structure. However, the structure of phenol is relatively stable, because it can satisfy the structure of a direction ring, so the phenol is the main existence form in the intertransformation isomeric equilibrium.
Phenols, cresol, aminophenol, nitrophenol, naphthol and chlorophenol, etc., are most prominent in phenol and cresol.
Phenol, also known as phenol, is also known as carbolic acid, slightly acidic (corrosive), volatile under normal temperature, and emits a special irritant stink, which turns pink in the air. The commonly used disinfectant in hospitals is the dilute solution of phenol sodium salt.
Cresol, also known as coal phenol, is similar to the chemical activity and toxicity of phenol, and it often exists simultaneously.
The phenol type is different from the number of hydroxyl groups directly connected by its aromatic ring, which can be divided into monophenol and polyphenol. According to its volatility can be divided into volatile phenol and non-volatile phenol. One yuan more volatile phenol (boiling point within 230 ℃). The simplest phenol is phenol, a colorless solid with a special odor, which was first found in coal tar and is also known as carbolic acid (because of its acidity).
When placed in the air, many phenolic compounds are caused by with pink and brown, while the partial oxidation products of phenol molecules and phenol and can also generate hydrogen bonding between water molecules, so its boiling point and is soluble in water than similar molecular weight and high aromatic hydrocarbons. Phenol has less solubility in cold water, but it is soluble with hot water and soluble in organic solvents such as alcohol and ether.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian