Compressed powder
The compression molding powder for producing molded articles is one of the main uses of phenolic resins. The resin is impregnated with the filler by a roll pressing method, a spiral extrusion method and an emulsion method, and uniformly mixed with other auxiliaries, and then pulverized and sieved to obtain a compression molding powder. Common wood powder is used as filler. In order to manufacture some high electrical insulation and heat resistance parts, inorganic fillers such as mica powder, asbestos powder and quartz powder are also used. The compression molded powder can be made into various plastic products by molding, transfer molding and injection molding. Thermoplastic phenolic resin compression molding powder is mainly used in the manufacture of electrical parts such as switches, sockets and plugs, daily necessities and other industrial products. Thermosetting phenolic resin compression molding powder is mainly used to manufacture high electrical insulation parts. Reinforced phenolic plastics Various fibers and their fabrics are impregnated with a phenolic resin (mainly thermosetting phenolic resin) solution or emulsion. Various reinforced plastics that have been dried and pressed into form are important industrial materials. It not only has high mechanical strength, good comprehensive performance, but also can be machined. Phenolic plastics reinforced with glass fibers, quartz fibers and their fabrics are mainly used in the manufacture of various brake linings and chemical anti-corrosion plastics; high silicate glass fibers and carbon fiber reinforced phenolic plastics are important ablative materials for the aerospace industry.
Phenolic Coatings Resin-modified phenolic resin, butanol etherified phenolic resin, p-tert-butyl phenolic resin and p-phenylphenolic resin have good miscibility with tung oil and linseed oil, and are important raw materials for the coating industry. The first two are used to formulate low- and medium-grade paints, and the latter two are used to formulate high-grade paints.
Phenolic glue
Thermosetting phenolic resins are also important raw materials for adhesives. A single phenolic resin is brittle and is mainly used for the bonding of plywood and precision sand. Adhesives based on other high polymer modified phenolic resins play an important role in structural adhesives. Among them, phenolic-butyronitrile, phenolic-acetal, phenolic-epoxy, phenolic-epoxy-acetal, phenolic-nylon and other adhesives have the characteristics of good heat resistance and high bonding strength. Phenolic-butyronitrile and phenolic-acetal adhesives also have excellent properties such as tensile strength, impact resistance, moisture and heat aging resistance, and are excellent varieties of structural adhesives.
Phenolic fiber
The thermoplastic linear phenolic resin is mainly used as a raw material, and is melt-spun and immersed in an aqueous solution of polyoxymethylene and hydrochloric acid for curing treatment to obtain a formaldehyde crosslinked bulk structural fiber. In order to increase the fiber strength and modulus, it can be melt-blended with 5% to 10% polyamide and then spun. These fibers are golden or yellow-brown fibers with a strength of 11.5 to 15.9 cN/dtex, outstanding flame resistance, a limiting oxygen index of 34, and an instantaneous exposure to an oxygen-acetylene flame of approximately 7500 ° C. They do not melt or ignite. It is also resistant to concentrated hydrochloric acid and hydrofluoric acid, but it is inferior to sulfuric acid, nitric acid and strong alkali. It is mainly used as protective clothing and flame-resistant fabrics or upholstery. It can also be used as insulation, heat insulation and insulation, filter materials, etc. It can also be processed into low-strength, low-modulus carbon fiber, activated carbon fiber and ion exchange fiber.
Corrosion resistant material
Thermosetting phenolic resin is commonly used in the field of anti-corrosion: phenolic resin coating; phenolic resin glass reinforced plastic, phenolic-epoxy composite glass reinforced plastic; phenolic resin cement, mortar; phenolic resin impregnated, pressed graphite products. The cured form of the thermosetting phenolic resin is classified into two types: room temperature curing and heat curing. At room temperature curing, a non-toxic normal temperature curing agent NL can be used, and benzenesulfonyl chloride or petroleum sulfonic acid can also be used, but the latter two materials are more toxic and irritating. Low toxicity and high efficiency NL curing agents are recommended. The filler may be selected from graphite powder, porcelain powder, quartz powder, barium sulfate powder, and diabase powder is not suitable.
Thermal insulation material
It is mainly a foaming material of phenolic resin. The phenolic foam product is characterized by heat preservation, heat insulation, fire prevention and light weight. As a new material for heat insulation, energy saving and fire prevention, it can be widely used in central air conditioning systems, light insulation color steel plates, and house insulation. Insulation materials for thermal insulation, chemical pipelines (especially for deep and low temperature insulation), and insulation for vehicles and ships. Phenolic foam is known as the king of insulation because of its low thermal conductivity and good thermal insulation properties. Phenolic foam not only has low thermal conductivity and good thermal insulation performance, but also has good flame retardancy, good thermal stability, light weight, low smoke, low toxicity, heat resistance, high mechanical strength, strong sound insulation, strong chemical resistance, and good weather resistance. Advantages, phenolic foam plastic raw materials are abundant, low in price, simple in production and processing, and widely used in products.
Edit the future development of this section of phenolic resin green phenolic resin research
The production and use of phenolic resin will bring a certain degree of pollution to the environment and affect the whole ecological environment. However, pay attention to or strengthen the pollution control, including wastewater treatment and recycling of waste phenolic resin products and composite materials, so that phenolic resin can be healthy. Rapid development.
Latest developments in phenolic resins
The development and research work on phenolic resin mainly focuses on reinforcement, flame retardant, low-smoke and molding applicability. It is functionalized and refined. The scientists of various countries have researched and developed high value-added phenolic resin materials.
Formaldehyde-free environmentally friendly new resin
The new phenolic resin is a polymer compound produced by condensation reaction between phenol and aralkyl ether. The new phenolic resin has good mechanical properties and heat resistance, and is widely used in diamond products, grinding wheel manufacturing and other industries. New phenolic resin Strong adhesion, good chemical stability, high heat resistance, small shrinkage during hardening, and stable product size. The bonding strength is 20% or more higher than that of the phenol resin, and the heat resistance is improved by 100 ° C or more. The new phenolic resin product can be used for a long time at 250 ° C, and the product is resistant to moisture and alkali.
The new phenolic resin can be used as a bonding agent for the diamond grinding wheel. The method of use is as follows: The new phenolic resin and the phenolic resin are mixed in a ratio of 1:3, which not only improves the strength of the phenolic resin, but also improves the heat resistance and the grinding ratio. If the new phenolic resin is used alone, the life of the grinding wheel is 8 times that of the phenolic resin, and the production process is about 30% higher than the strength of the phenolic resin product, and the grinding effect is also improved.