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pvc pvc as early as 1835 for the united states v. regnaud found, generating a white solid with sunlight of vinyl chloride, namely pvc.
pvc was found two times in nineteenth century, one was henri victor regnault in 1835,&the other was found in 1872 by eugen baumann. in the two opportunity, the polymer appeared in a beaker of vinyl chloride placed under the light of the sun&became a white solid. in the early twentieth century, russian chemist ivan ostromislensky&chemist fritz klatte of griesheim-elektron company tried to use pvc for commer---l purposes, but the difficulty was how to process this hard, sometimes brittle polymer.
in 1912, the german fritz klatte synthesized pvc&applied for a patent in germany, but was not able to develop a suitable product before the patent expired.
in 1926, the waldo semon of the b.f. goodrich company in the united states synthesized pvc&applied for a patent in the united states. waldo semon&b.f. goodrich company developed the method of plasticizing pvc by adding various auxiliaries in 1926, --- it a more flexible&more easily processed material,&soon it was widely used in commer---l applications.
in 1914, organic peroxide could be used to accelerate the polymerization of vinyl chloride. in 1931, the german company adopted the emulsion polymerization process to realize the industrial production of pvc. in 1933, w.l. simon proposed that the mixture of high boiling point solvents&three cresol phosphate can be mixed with pvc to produce soft pvc products, which has made a breakthrough in the practicability of pvc. the processing&application of suspended british imperial chemical industries limited, union carbine co&goodride chemical company almost simultaneously in 1936 developed the polymerization of vinyl chloride&pvc. in order to simplify the production process, reduce energy consumption, in 1956 the french shenggebang company developed bulk polymerization. in 1983, the worlds total consumption was about 11.1mt,&its total production capacity was about 17.6mt. it was the second largest plastic product after polyethylene production, accounting for 15% of the total output of plastics. the self-designed pvc production plant in china was trial manufactured in jinxi chemical plant of liaoning in 1956. in 1958, the 3kt plant was formally industrialized&the output of 530.9kt was 1984.
pvc was industrialized in the early 30s. from 30s onwards, in a very long time, pvc production has been in the world of plastic content occupied the first. in the late 60s, polyvinyl chloride was replaced by polyvinyl chloride. although pvc plastics are retreated to second, the output of pvc still accounts for more than 1/4 of the total plastic production.
before 60s, the production of mono vinyl chloride was mainly calcium carbide acetylene, because the production of calcium carbide consumed a large amount of electric energy&coke, high cost. at the beginning of the 60s ethylene oxychlorination process for vinyl chloride production industrialization, all countries turn to cheaper oil as raw material. in addition, most of the raw materials of pvc (about 57% wt%) are the asso---ted by-products of chlorine, which are not only rich in raw materials, but also one of the most important products for developing chlor alkali industry&balancing chlorine. as a result, the proportion of pvc in plastic has been reduced, but it still maintains a high growth rate.
pvc plastics products are widely used, but in the middle of 70s, it was recognized that the monomer vinyl chloride (vcm) remained in pvc resin&products is a serious
eva 1, widely used in foam material, functional films, packaging mold, hot melt adhesive, wire&cable&toys&other fields.
2, the eva product of ethylene acetate content in 5%~10% is elastic film, etc.
3, the content of ethylene acetate is eva in 20~28%, which is mainly used in hot melt adhesives&coating products.
4, the content of vinyl acetate is 5%~45%, the main products are thin film (including agricultural film)&sheet, injection molding, molded products, foaming products, hot-melt adhesives&so on.
(1) foamed shoe material. the shoe material is the most important application field of eva resin in our country. in the eva resin used in the shoe material, the content of vinyl acetate is generally 15% ~ 22%. because eva resin blend foam is soft, elastic&chemical resistant, it is widely used in soles&interior materials of middle&high grade tourist shoes, mountaineering shoes, slippers&sandals. in addition, this material is also used in the field of sound insulation board, gymnastic mat&sealing material.
(2) thin film. the main purpose of eva film is the production of functional films. the functional films with high weatherability, anti fog&insulation performance, because polyethylene has no polarity, even adding a certain amount of antifogging agents, the antifogging properties can only be maintained for about 2 months;&adding a certain amount of eva made of resin film, light not only has a higher rate, but also antifogging property have greatly improved, can be more than 4 months. in addition, eva also can be used in the production of packaging film, medical film, laminated film, cast film.
(3) wire&cable. with the continuous development of computer&network engineering, more&more halogen-free flame-retardant cables&silane crosslinking cables are widely used due to the consideration of the safety of the computer room. because eva resin has good filler inclusiveness&crosslinkability, it is widely used in halogen free flame retardant cable, semiconductor shielded cable&two step silane crosslinking cable. in addition, the eva resin is also used to make some spe---l cable sheath. the eva resin used in wire&cable is generally 12% to 24% of vinyl acetate.
lcp1.1 advantages of material
2.2 material properties
3.3 molding process
4.4 main uses
material advantages
lcp advantages.
1. high mobility
2. good size&good stability
3. good liquidity
4, solvent resistance
5. high mechanical strength
6. combustibility
lcp use.
1. speed connectors, coils, switches, sockets
2. the parts of the pump&the parts of the valve
3. automobile fuel peripheral parts
4, electronic furnace container
poor mechanical property perpendicular to the direction of idea&flow
material properties
nature
molding process

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