PHENOL-FORMALDEHYDE RESIN CAS 9003-35-4

Compression molding powder for producing molded products is one of the main uses of phenolic resin. The resin is impregnated with fillers and mixed with other additives by roller pressing, screw extrusion and emulsion method, and then crushed and sieved to obtain compression molding powder. Wood powder is often used as filler. In order to manufacture certain high electrical insulation and heat-resistant parts, inorganic fillers such as mica powder, asbestos powder, quartz powder, etc. are also used. Compression molding powder can be made into various plastic products by molding, transfer molding and injection molding. Thermoplastic phenolic resin compression molding powder is mainly used to manufacture electrical parts such as switches, sockets, 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 are various reinforced plastics that are impregnated with various fibers and fabrics with phenolic resin (mainly thermosetting phenolic resin) solution or emulsion, and then dried and pressed to form various reinforced plastics. It not only has high mechanical strength and good comprehensive performance, but also can be machined. Phenolic plastics reinforced with glass fiber, quartz fiber and their fabrics are mainly used to manufacture various brake friction pads and chemical anti-corrosion plastics; phenolic plastics reinforced with high-silica glass fiber and carbon fiber are important ablation-resistant materials in the aerospace industry.

Rosin-modified phenolic resins, butanol-etherified phenolic resins, tert-butyl phenolic resins, and p-phenyl phenolic resins all have good miscibility with tung oil and linseed oil and are important raw materials for the coating industry. The first two are used to prepare low- and medium-grade paints, and the latter two are used to prepare high-grade paints.

Thermosetting phenolic resins are also important raw materials for adhesives. Single phenolic resins are brittle and are mainly used for bonding plywood and precision casting sand molds. Adhesives based on phenolic resins modified by other polymers occupy an important position in structural adhesives. Among them, phenolic-nitrile, phenolic-acetal, phenolic-epoxy, phenolic-epoxy-acetal, phenolic-nylon and other adhesives have the characteristics of good heat resistance and high bonding strength. Phenolic-nitrile and phenolic-acetal adhesives also have excellent properties such as tensile resistance, impact resistance, and resistance to moisture and heat aging, and are excellent varieties of structural adhesives.

Mainly made of thermoplastic linear phenolic resin as raw material, after melt spinning, immersed in an aqueous solution of polyformaldehyde and hydrochloric acid for curing treatment, formaldehyde cross-linked body structure fiber is obtained. In order to improve the strength and modulus of the fiber, it can be melt-mixed with 5% to 10% polyamide and then spun. This type of fiber is golden or yellow-brown, with a strength of 11.5-15.9 cN/dtex, outstanding flame retardancy, a limiting oxygen index of 34, and instantaneous contact with an oxygen-acetylene flame of nearly 7500°C. It does not melt or burn, has self-extinguishing properties, and is resistant to concentrated hydrochloric acid and hydrofluoric acid, but has poor resistance to sulfuric acid, nitric acid and strong alkali. It is mainly used as protective clothing and flame-resistant fabrics or interior decorations, and can also be used as insulation, heat insulation and insulation, filter materials, etc. It can also be processed into low-strength, low-modulus carbon fibers, activated carbon fibers and ion exchange fibers.

Several common forms of thermosetting phenolic resins in the field of corrosion protection: phenolic resin coatings; phenolic resin fiberglass, phenolic-epoxy resin composite fiberglass; phenolic resin cement, mortar; phenolic resin impregnation, pressed graphite products. The curing forms of thermosetting phenolic resins are divided into two types: room temperature curing and heat curing. For room temperature curing, non-toxic room temperature curing agent NL can be used, or benzenesulfonyl chloride or petroleum sulfonic acid can be used, but the latter two materials are more toxic and irritating. It is recommended to use low-toxic and high-efficiency NL curing agent. Fillers can be selected from graphite powder, porcelain powder, quartz powder, and barium sulfate powder. Diabase powder should not be used.

It is mainly a foaming material of phenolic resin. The characteristics of phenolic foam products are thermal insulation, heat insulation, fire prevention, and light weight. As a new material for thermal insulation, energy saving, and fire prevention, it can be widely used in central air-conditioning systems, lightweight thermal insulation color steel plates, house thermal insulation and energy reduction insulation, thermal insulation materials for chemical pipelines (especially deep low temperature insulation), and thermal insulation fields in places such as vehicles and ships. Phenolic foam is known as the king of thermal insulation because of its low thermal conductivity and good thermal insulation performance. Phenolic foam not only has low thermal conductivity and good thermal insulation performance, but also has many advantages such as flame retardancy, good thermal stability, light weight, low smoke, low toxicity, heat resistance, high mechanical strength, sound insulation, strong resistance to chemical corrosion, and good weather resistance. Phenolic foam plastic has abundant raw materials, low price, simple production and processing, and the product has a wide range of uses.