What is phenolic resin?
Phenolic resin is also called bakelite, also known as bakelite powder. It used to be colorless or yellowish brown transparent material. It is usually sold in red, yellow, black, green, brown, blue and other colors with colorants, and it is in the form of particles and powder. It is resistant to weak acid and alkali, decomposes in case of strong acid and corrodes in case of strong alkali. Insoluble in water, soluble in acetone, alcohol and other organic solvents. Phenol aldehyde or its derivatives are polycondensated. The solid phenolic resin is yellow, transparent and amorphous, which is reddish due to the free phenol. The average specific gravity of the solid is about 1.7. It is easy to dissolve in alcohol and water. It is stable for water, weak acid and weak solution. The resin is made of phenol and formaldehyde by polycondensation, neutralization and water washing under the condition of catalyst. Due to the different selection of catalysts, they can be divided into two types: thermosetting and thermoplastic. Phenolic resin has good acid resistance, mechanical properties and heat resistance. It is widely used in anti-corrosion engineering, adhesives, flame-retardant materials, grinding wheel manufacturing and other industries. Liquid phenolic resin is yellow, dark brown liquid, such as: basic phenolic resin is mainly used as casting adhesive.
It has high temperature performance
The most important characteristic of phenolic resin is its high temperature resistance, which can keep its structural integrity and dimensional stability even at very high temperature. For this reason, phenolic resin has been applied in some high-temperature fields, such as refractory, friction material, binder and foundry industry. The development and research work of phenolic resin mainly focuses on strengthening, flame-retardant, low smoke and molding applicability, and develops to functionalization and refinement. The research of phenolic resin materials with high added value is carried out by the scientific departments of various countries. Development .
New phenolic resin is a high molecular compound, which is produced by condensation reaction of phenol and aryl ether. New phenolic resin has good mechanical properties and heat resistance, which is widely used in diamond products, grinding wheel manufacturing and other industries. New phenolic resin has strong adhesion, good chemical stability, high heat resistance, small shrinkage when hardening, and stable product size. The bond strength is 20% higher than that of phenolic resin, and the heat resistance is 100 ℃ higher. The new phenolic resin products can be used at 250 ℃ for a long time. The products are resistant to humidity and alkali.
The new phenolic resin can be used as the bond of diamond wheel. The method of use is: the new phenolic resin and phenolic resin are mixed according to 1:3, which not only improves the strength of phenolic resin, but also improves the heat resistance and grinding ratio. If the new phenolic resin is used alone, the service life of grinding wheel is 8 times longer than that of phenolic resin, the strength of grinding wheel is about 30% higher than that of phenolic resin in production process, and the grinding effect is also improved.