a thermosetting plastic
Thermosetting plastic is refers in the heating or other conditions
can be cured or insoluble ( molten ) characteristics of plastic,
such as phenolic plastic, epoxy plastic. Thermosetting plastic and
formaldehyde cross-linking and other crosslinking type two types.
Hot molding formed after having fused insoluble cured, the resin
molecule consists of linear structure cross-linked into a reticular
structure.Water
slide To strengthen the heat will be destructive. Typical
thermosetting plastic, epoxy, phenolic amino, unsaturated polyester
resin, furan, poly silyl ether and other materials, and the newer
polystyrene two formic acid two propylene ester plastic.
It has a high heat resistance, heat is not easy deformation
etc.. Drawback is the mechanical strength is generally not high,
but can be achieved by adding fillers, made of laminated material
or moulding material to improve its mechanical strength.
With phenolic resin as the main raw material of thermosetting plastic, such as phenolic molded plastic ( commonly known as bakelite ), a durable, stable size, high removing alkali and other chemical substances etc.. According to different purposes and requirements, to join the various fillers and additives. If the requirements of high insulation performance of varieties, the mica or glass fiber as filler; such as heat resistant varieties, with asbestos or other heat resistant filler; such as seismic varieties, can be used with a variety of appropriate fiber or the rubber filler and plasticizer made of high tenacity material. In addition to using aniline, polyamide, epoxy, PVC, polyvinyl acetal modified phenolic resin to meet the requirements of different uses.
Phenolic resin can also be made into phenolic laminate, which is characterized by high mechanical strength, good electrical performance, corrosion resistance, easy processing, widely used in low voltage electrical apparatus.
Amino plastic urea formaldehyde, melamine formaldehyde, urea melamine formaldehyde. They are hard, resistant to scratches, colorless, transparent wait for an advantage, add pigment can be made bright color products, commonly known as jade electric. Because of its resistance to oil,Plastic wood from a weak base and organic solvent effects ( but not acid ) at 70 DEG C, can be long-term use, short-term resistance at 110 to 120 DEG C, can be used for electrical products. Melamine formaldehyde plastic than urea formaldehyde plastics high hardness, better water, heat resistance, arc resistance, can be used for arc resistant insulating material.
With epoxy resin as the main raw material of thermosetting plastics in many varieties, including bisphenol A type epoxy resin as base material of about 90%. It has excellent adhesiveness, electric insulation, heat resistance and chemical stability, shrinkage and water absorption of small, good mechanical strength and other characteristics.
Unsaturated polyester and epoxy resin can be made of glass, which has excellent mechanical strength. Such as unsaturated polyester glass steel, its good mechanical properties, density is small ( only 1 / 5 of steel to 1 / 4, 1 / 2 aluminum ), easy processing into a variety of electrical components. In order to benzene two formic acid two acrylic resin plastic electric performance and mechanical performance are superior to those of phenolic and amino thermosetting plastic.
It is hygroscopic, products, stable size, forming a good performance, acid and alkali resistance and boiling water and organic solvent.Playground equipment Plastic mold is suitable for manufacturing complex, resistant to both Wen Youyou high insulating parts. Generally in the - 60 to 180 DEG C temperature range for long-term use, heat resistant grade up to grade F to H grade, ratio of phenolic and aminoplastic heat resistance is high.
Poly silicon ether structure silicone plastics in electronic, electrical engineering technology in the application of more. Silicone laminate with glass cloth as reinforcing materials; silicone molded plastic with glass fiber and asbestos filler, used in the manufacture of high temperature, high frequency or submersible motor, electrical, electronic equipment parts. This kind of plastic is characterized by a dielectric constant and TG delta value is smaller, is subject to the influence of frequency, used in electrical engineering and electronic industry in the corona resistant and arc discharge, even cause decomposition, is the product of silica instead of electrically conductive carbon black. This kind of material has outstanding heat resistance, can be used continuously in 250 DEG c.
Poly silicon ether is the main drawback of low mechanical strength, adhesive, oil resistance difference. Already developed a lot of modified organosilicon polymer, such as polyester modified silicone plastics in electrical technology application. Some of the plastics both thermoplastic and thermosetting plastic is. For example, PVC, generally for thermoplastics, Japan has developed a new type liquid PVC is a thermoset, molding temperature of 60 to 140 DEG C; the United States is called a Lun DEX plastic, both thermoplastic processing characteristics, and physical properties of thermosetting plastic.
The hydrocarbon plastic. Genus of nonpolar plastic, with
crystalline and non-crystalline cent, crystalline hydrocarbon
plastics including polyethylene, polypropylene, non-crystalline
hydrocarbon plastics including polystyrene B.
The polarity genes containing vinyl plastic. Fluorine plastic, most
are non crystalline transparent body, including polyvinyl chloride,
PTFE, polyvinyl acetate, etc.. Vinyl monomers by free radical type
most catalyst for polymerization.
The thermoplastic engineering plastics. Mainly include POM, polyamide, polycarbonate, ABS, polyphenylene ether, polyethylene terephthalate two ester, polysulfone, PES, polyimide, PPS. Teflon. Modified polypropylene are also included in this range.
The thermoplastic cellulose plastic. Mainly include cellulose acetate, cellulose acetate butyrate, celluloid, glass paper.
