Polyphenols crosslinking agent

Polyphenols crosslinking agent,Is mainly refers to phenolic resin, its phenol base can react with epoxy group in the heat. Phenolic resin and epoxy resin compatibility is very good, the film adhesion, flexibility, impact resistance, high brightness, and anticorrosion performance is very good flowing property and good storage stability and reactivity can be mitigated by promoting agent, non-toxic, can be used in direct contact with food, water and other coating system.

Phenolic resin crosslinking agent used in epoxy powder coating system of main drawback is that yellow degeneration resistance is very poor, not suitable for making white paint. At the same time, the presence of aromatic ether groups will further reduce the uv resistance of epoxy resin.

The development of powder coatings inevitable with the development of the crosslinking agent. Both paint storage stability, low temperature crosslinking and energy saving, high efficiency low dosage, the thin layer of coating film and good decoration, mechanics, anticorrosion and weather resistance are in the improvement and development of new crosslinking agent must consider the question.
Phenolic resin is also called the bakelite, also called bakelite powder. Originally colorless or brown transparent material, the market often add colorant and a red, yellow, black, green, brown, blue wait for color, particles, powder. Weak acid and weak base resistance, meet acid decomposition, in strong alkali corrosion. Insoluble in water, but soluble in organic solvents such as acetone, alcohol. Phenol aldehyde condensation or its derivatives.

Solid phenolic resin for yellow, transparent, amorphous block material, because contain free phenol and is slightly red, the proportion of entity an average of around 1.7, soluble in alcohol, insoluble in water, the water, weak acid and weak base solution stability. By phenol and formaldehyde in catalyst under the condition of polycondensation, via neutralization, water washing and made of resin. For selecting the different catalysts, can be divided into two categories, thermosetting and thermoplastic. Phenolic resin has good acidproof performance, mechanical properties, heat resistance, is widely applied in anti-corrosion engineering, adhesive and flame retardant materials, grinding wheel manufacturing and other industries.

Liquid phenolic resin as yellow, dark brown.

Phenolic resin is the most important feature is the high temperature resistance, even at very high temperatures, can maintain the stability of the integrity of the structure and size. Is for this reason, the phenolic resin was used in some high temperature fields, such as refractory material, friction material, binder and casting industry.




Chinese name: Diethyl toluene diamine(DETDA)

Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.

Density 1.022

Viscosity (20 ℃) ??mPa·ss290±10

Pour Point ℃-9

Boiling point of310°C

Flash Point°C161.1°C


Is an important application of phenolic resin as binder. Phenolic resin is a kind of multi-functional, with a variety of organic and inorganic filler can compatible material. Design proper phenolic resin, wetting particularly fast. And after crosslinking can be abrasive, fire-proof material, friction material, and provide the required mechanical strength, bakelite heat-resistant properties and electric properties.

Water soluble phenolic resin or alcohol soluble phenolic resin was used to impregnated paper, cloth, glass, asbestos and other similar material for them to provide mechanical strength, electrical, etc. Typical examples include electrical insulating and mechanical laminated manufacturing, clutch plate and automobile filter with a filter paper.

At the temperature about 1000 ℃ under inert gas conditions, phenolic resin will produce high carbon residue, which is beneficial to maintain the structure stability of phenolic resin. The properties of phenolic resin, and it can be used for refractory material in the field of an important reason.

Compared with other resin systems, phenolic resin system has the advantages of low smoke low toxicity. In the case of burning, with the scientific formula to produce phenolic resin system, will be slow decomposition hydrogen, hydrocarbons, water vapour and carbon dioxide. Produced in the process of decomposition smoke less, toxicity is relatively low. These characteristics make phenolic resin is suitable for the area of public transport and safety requirements is very strict, such as mining, fencing, construction and so on.

After crosslinking phenolic resin can resist any chemical decomposition. Such as gasoline, oil, alcohol, ethylene glycol, grease and all kinds of hydrocarbons. Because of its resistance to chemical stability, suitable for making hutch appliance, drinking water purification equipment (phenolic carbon fiber), bakelite tea tray, tea set, and widely used in cans and cans, food and beverage packaging material such as liquid container.

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