What is phenolic resin?
Phenolic resin is also called bakelite and phenolic molding compound. Originally a colorless or yellowish brown transparent substance, it is often sold in the market as red, yellow, black, green, brown, blue and other colors, with particles and powder. Resistant to weak acid and alkali, decomposed in strong acid and corroded in strong alkali. Insoluble in water, soluble in organic solvents such as acetone and alcohol. Phenolic aldehyde or its derivatives are obtained by polycondensation.
Nature:
Solid phenolic resin is a yellow, transparent and amorphous block substance, which is red because it contains free phenol. The average specific gravity of solid is about 1.7, which is soluble in alcohol and insoluble in water, and stable to water, weak acid and weak alkali solution. Resin made of phenol and formaldehyde by polycondensation, neutralization and water washing under the condition of catalyst. Due to the different catalysts, it can be divided into thermosetting and thermoplastic. Phenolic resin has good acid resistance, mechanical properties and heat resistance, and is widely used in anti-corrosion engineering, adhesives, flame retardant materials, grinding wheel manufacturing and other industries.
Liquid phenolic resin is a yellow dark brown liquid. For example, alkaline phenolic resin is mainly used as casting binder.
High temperature characteristics
The most important feature of phenolic resin is its high temperature resistance, which can maintain its structural integrity and dimensional stability even at very high temperatures. It is for this reason that phenolic resin is used in some high-temperature fields, such as refractories, friction materials, adhesives and foundry industry.
bonding strength
An important application of phenolic resin is as adhesive. Phenolic resin is a multifunctional material, which is compatible with various organic and inorganic fillers. When the phenolic resin is designed correctly, wetting speed is particularly fast. After crosslinking, it can provide necessary mechanical strength, heat resistance and electrical properties for abrasives, refractories, friction materials and phenolic molding compounds.
Water-soluble phenolic resin or alcohol-soluble phenolic resin is used to impregnate paper, cotton cloth, glass, asbestos and other similar substances, providing them with mechanical strength and electrical properties. Typical examples include electrical insulation and mechanical lamination manufacturing, clutch plates and auto filter filter paper.
High carbon residue rate
At a temperature of about 1000℃? Under the condition of inert gas, phenolic resin will produce high carbon residue, which is beneficial to maintain the structural stability of phenolic resin. This characteristic of phenolic resin is also an important reason why it can be used in the field of refractories.
Low smoke and low toxicity
Compared with other resin systems, phenolic resin system has the advantages of low smoke and low toxicity. In the case of combustion, the phenolic resin system produced by scientific formula will slowly decompose to produce hydrogen, hydrocarbons, water vapor and carbon oxides. The smoke produced in the decomposition process is less and the toxicity is lower. These characteristics make phenolic resin suitable for fields with strict requirements on transportation and safety, such as mines, fences and buildings.
chemical resistance
Crosslinked phenolic resin can resist the decomposition of any chemical substance. Such as gasoline, petroleum, alcohol, glycol, grease and various hydrocarbons. Because of its good chemical stability, it is suitable for making kitchen utensils, drinking water purification equipment (phenolic carbon fiber), bakelite tea trays and tea sets, and is widely used in cans (national standard GB? 05009.069-2003), liquid containers and other food and beverage packaging materials.
heat treatment
Heat treatment will increase the glass transition temperature of the cured resin and further improve the properties of the resin. The glass transition temperature is similar to the melting state of crystalline solids such as polypropylene. The initial glass transition temperature of phenolic resin is related to the curing temperature used in the initial curing stage. Heat treatment can improve the fluidity of crosslinked resin to promote further reaction, at the same time, it can also remove residual volatile phenol, reduce shrinkage, and enhance dimensional stability, hardness and high temperature strength. At the same time, resin tends to shrink and become brittle. The temperature rise curve of resin post-treatment will depend on the initial curing conditions of resin and resin system.
Manufacturer's suggestion:
Xinxiang BMW Feng Fan Industry Co., Ltd.
2 130 phenolic resin
Batch number: 1 kg or above
Price: 15.2 yuan
Jining baichuan chemical co., ltd
Phenolic resin for 2l76 hand-pasted FRP
Batch number: 1 kg or above
Price: 100 Yuan
Jining Hua Kai resin co., ltd
Phenolic resin is produced for friction materials, such as friction materials, brake pads and brake shoes.
Lot size: over 1 ton
Price: 14000 yuan
Qingdao ruixin chemical co., ltd
C9 petroleum resin light color? Tackifying resin rubber tackifier
Lot size: over 1 ton
Price: 8500 yuan
The above is the recommendation of phenolic resin manufacturers and the introduction of related contents. I wonder if you have a deeper understanding of phenolic resin. Bian Xiao would like to remind everyone here that when storing phenolic resin, remember to keep it in a cool and ventilated place, away from fire and heat sources. The above manufacturers and prices are for your reference only. Please check with the manufacturers directly for specific prices. I hope the above contents are helpful to everyone!
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