Definition of resin and plastic

oneResin is definedresin usually refers to the heat after softening or melting range, softening under the external force of the tendency to flow, at room temperature is solid, semi-solid, and sometimes liquid organic polymerBroadly speaking, any polymer that can be processed as a raw material for plastic products is called resinresins are divided with natural resins and synthetic resinsNatural resin refers to amorphous organic substances, such as rosin, amber, insect glue, etcderived from the secretions of animals and plants in natureSynthetic resins are resin products derived from chemical synthesis of simple organic matter or chemical reactions of certain natural productsIIPlastics are definedplastics are materials that can flow into molding with resins (or direct polymerization with monomers during processing) as the main components, and additives such as plasticizers, fillers, lubricants, colorants, etcas auxiliary componentsplastics mainly have the following characteristics: (1) most plastics are light, good chemical stability, will not rust; Low processing costs, (6) poor heat resistance of most plastics, large thermal expansion rate, easy to burn; (7) poor dimensional stability, easy deformation; (8) poor low temperature resistance, low temperature brittleness; (9) easy aging; (10) some plastics are soluble in solventsthe classification of resins and plasticsThere are many classification methods for resin classificationresin, in addition to the source of the resin can be divided into natural resin and synthetic resin, but also by synthetic reaction and main chain composition to classify1 The resin can be classified according to the resin synthesis reaction
the resin can be divided into polymers and shrinks according to this method Polygon refers to polymers produced by additive polymerization reaction, and the chemical formula of the chain-link structure is the same as that of the monomer, such as polyethylene, polystyrene, polytetrafluoroethylene, etc shrink refers to a polymer produced by a condensed polymer reaction, the chemical formula of the structural unit is different from the molecular formula of the monomer, such as phenolic resin, polyester resin, polyamide resin, etc 2 The resin can be divided into carbon chain polymers, hectic polymers and elemental organic polymers according
to this method carbon chain polymer refers to the main chain of polymers composed entirely of carbon atoms, such as polyethylene, polystyrene and so on hetero-chain polymer refers to the main chain of carbon and oxygen, nitrogen, sulfur and other two elements of the atomic composition of the polymer, such as polyformaldehyde, polyamide, polyurethane, polyether and so on element organic polymer refers to the main chain does not necessarily contain carbon atoms, mainly composed of silicon, oxygen, aluminum, titanium, boron, sulfur, phosphorus and other elements of the atom, such as silicon II The classification system of plastics is more complex plasticclassification, and various classification methods are crossed, according to the general classification mainly have the following three: one is classified by the characteristics of use, the other is classified by physical and chemical characteristics, and the third is classified by processing methods 1 Classified by use characteristics
according to the different characteristics of use of the name of the plastic, the plastic is usually divided into general plastic, engineering plastic and specialty plastic three types (1) general plastic generally refers to large production, wide use, good molding, cheap plastics, such as polyethylene, polypropylene, phenolic and so on (2) engineering plastics general lypophoid can withstand a certain external force, with good mechanical performance and resistance to high and low temperature performance, dimensional stability is good, can be used as engineering structure of plastics, such as polyamides, polyurethane and so on in the engineering plastics are divided into general engineering plastics and special engineering plastics two categories general engineering plastics include: polyamides, polyformaldehyde, polycarbonate, modified polyphenyl ether, thermoplastic polyester, ultra-high molecular weight polyethylene, methylprene polymer, ethylene alcohol copolymer, etc special engineering plastics and cross-linking type of non-cross-linked Cross-linked types are: polyaminobiamine, polytrithan, cross-linked polyamide, heat-resistant epoxy tree finger, etc Non-cross-linked types are: polyurethane, polyether, polyphenyl thie, polyamide, polyether ketone (PEEK) and so on (3) special plastics generally refers to plastics with special functions that can be used in special applications such as aviation and aerospace Such as fluoroplastics and silicones have outstanding high temperature resistance, self-lubrication and other special functions, reinforced plastics and foams with high strength, high buffering and other special properties, these plastics belong to the category of specialty plastics (1) reinforced plastic Reinforced plastic raw materials can be divided into granules (e.g calcium-reinforced plastic), fibrous (e.g fiberglass or glass cloth reinforced plastic), flaky (e.g mica-enhanced plastic) in appearance By material can be divided into cloth-reinforced plastics (such as rag-reinforced or asbestos-reinforced plastics), inorganic mineral-filled plastics (such as quartz or mica-filled plastics), fiber-reinforced plastics (such as carbon fiber-reinforced plastics) (2) foam Foam can be divided into hard, semi-hard and soft foam three kinds Hard foam has no flexibility, compression hardness is very large, only to reach a certain stress value to produce deformation, stress relief can not be restored to the original condition, soft foam is flexible, compression hardness is very small, easy deformation, stress relief can be restored to the original, residual deformation is small, semi-hard foam flexibility and other properties between the hard and other soft foam 2 According to the physical and chemical characteristics of the classification
according to the different physical and chemical characteristics of various plastics, plastics can be divided into thermoset plastics and hot plastic plastics two types (1) thermoset plastics
thermoset plastics are plastics that can be cured or have insoluble (melted) properties under heat or other conditions, such as phenolic plastics, epoxy plastics, etc Thermoset plastics are cross-linked and other cross-linked types of formaldehyde formaldehyde cross-linked plastics include phenolic plastics, amino plastics (e.g palate-formaldehyde-melamine-formaldehyde, etc.) other cross-linked plastics include unsaturated polyester, epoxy, phthalates, etc (2) hot plastic plastics hot plastic plastics are plastics that can be repeatedly heated and softened and cooled within a specific temperature range, such as polyethylene, teflon and so on Hot plastic plastics are divided into hydrocarbons, vinyl with polar genes, engineering, cellulose and other types (1) hydrocarbon plastics Non-polar plastics, with crystallization and non-crystalline, crystalline hydrocarbon plastics include polyethylene, polypropylene and so on, amorphous hydrocarbon plastics including polyphenyl seistic 2 vinyl plastics containing polar genes In addition to fluoroplastics, most are non-crystalline transparents, including PVC, polytetrafluoroethylene, polyvinyl acetate, etc Most vinyl monomers can be polymerized using free-based catalysts (3) thermoplastic engineering plastics Mainly includes polyformaldehyde, polyamide, polycarbonate, ABS, polyphenyl ether, polyphenyl diethylene, polyurethane, polyether, polyamide, polyphenyl sulfur ether and so on Ptfe Modified polypropylene, etc are also included in this range (4) thermoplastic cellulose plastics Mainly includes cellulose acetate, butyric acid cellulose, cervix, cellulose and so on 3 According to the processing method classification
according to the different molding methods of various plastics, can be divided into membrane pressure, lamination, injection, extrusion, blow molding, casting plastic and reaction injection plastic and other types membrane pressure plastics are mostly physically similar to the plastics of general solid plastics; laminated plastics are the fabrics of resin-immersed, which are folded and heated and combined into the whole material; Plastic refers to the mold can be poured into the mold can harden into a certain shape of the liquid resin mixture, such as MC nylon, etc ;