How much do you know about the hottest thermoplast

2022-08-14
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Thermoplastic polyester: how much do you know about them? (Part 2)

copolyesters expand the application field

DuPont's sales of some polyesters and copolyesters and their utilization scope are still subject to many restrictions, which does not hinder the development of Eastman production. Its latest development in the field of copolyesters is the production of glassy polymers. This polymer can be used to make thick walled bottles of cosmetics and personal care products, and can have the feel and luster of glass. These PTCA materials include Eastar an001 designed for injection and stretch molding and Eastar an001 designed for injection molding

why use PTCA? When the wall thickness of pet with lower cost is 3mm than that of the product made of PTCA, the crystallization speed is too fast and the transparency of the product is reduced. Acid modification in PTCA can reduce the crystallization speed, retain better transparency and have the texture of glass when the wall is thicker. Eastman is developing a new copolyester for extruded bottles and parts. PETG has long been used in extrusion molding to produce relatively small and simple bottles, such as containers in refrigerators. This unidentified new copolyester, called ebo62, exceeds PETG in hardness, transparency and heat resistance. This process opens the way for the production of harder, thicker and larger extruded parts using polyester

PETG is entering the field of laboratory instruments and thermoplastic medical packaging. Eastman's newly added Vista series products are for pipeline, signal transmission, medical treatment and packaging pipe services. Provista mp001 products improve heat resistance and reduce melt fracture at high shear rates by applying branching reagents and wider molecular weight distribution, but this product is slightly lacking in hardness

dn010 is also a new product of Eastman. It is an injection molding pctg product with good transparency (light transmittance can reach 92%), and its hardness is similar to that of polyacrylic acid. Higher toughness can reduce fracture. Another new type of pctg product that can be used in injection molding is mn005, which is used in the field of transparent medical equipment and packaging. The processability of this product is twice as good as that of ordinary pctg. At the same time, the decline in impact strength and tensile strength is also controlled to the minimum

SK chemistry produces CHDM and other copolymers in Korea. SK chemistry is a major producer in Asia and the Pacific. In this region, PETG displays, daily chemical bottles and other applications are gradually replacing PVC. SK is cautiously entering the film, sheet and injection molding markets in the United States through Skygreen PETG. This series of products are specially supplied to American consumers. Yoon Hong, the business development manager of SK chemistry in the United States, said that SK's process for manufacturing CHDM and copolyesters is different from Eastman's, so there are slight differences in properties

a new polyester star

poly (cyclopropane terephthalate) (PTT) was discovered in 1941. Shell chemical synthesized it by condensation of terephthalic acid and 1,3-propanediol. This product can only be processed by injection and extrusion molding. Shell made a breakthrough in catalyst, reducing the cost of catalyst PDO to $1/pound, making PTT at least competitive with pet and PBT in cost

the main market of Corterra PTT produced by shell is carpet surface and textile fiber. In these fields, it can provide good elasticity, stain resistance and dyeability. PTT carpet has been put on the market in Korea. However, shell put the cut-off three corner bag between the two rollers for tablet pressing. At the same time, the company is preparing to develop the application of PTT in engineering plastics. A product with high molecular weight has been used as a component in the mixture

shell chemical has a PTT resin production workshop with an annual output of 36million pounds/year, and will establish another 190million pounds/year production workshop in Montreal later this year. The owner of this workshop is an international company of shell, called PTT polymer Canada. A new continuous polymerization process will be applied to produce PTT in this workshop. Shell chemical will monopolize the market of this product

ptt is a kind of resin with a density of 1.35 g/cubic centimeter and can be rapidly crystallized. It can be molded by injection, extrusion and stretching. Compared with pet, this material is easier to process, which lays the foundation for the stable growth and maintenance of Jiaozuo City. At the same time, it is not easy to be hydrolyzed, and its mechanical properties are between pet and PBT. If 30% glass is doped, the performance of PTT can reach or slightly exceed that of simply enhanced PBT (see table). According to joele grand, Senior Sales Executive of shell, fiber free PTT can be used in almost all mixtures, and can also be mixed with PC, PBT or pet

Kailash dangayach, a senior R & D personnel of shell, said that PTT can form a smooth and shiny surface like a mirror during the molding process. This polymer is more resistant to bending than other polyesters and is easier to color than PBT. The researcher said that only 50% of the pigment is needed to achieve the same gloss as PBT

ptt's potential applications also include relatively large external surfaces for automobiles, agriculture, entertainment and other means of transportation; Industrial and daily-use equipment frame, exterior decoration of skyscrapers. PTT can also be extruded to form biaxially oriented films: a Korean film manufacturer used PTT/Pet mixture to replace PVC to produce shrink films for industrial vials

composites RTP, lati and albis are testing whether PTT polyester, which does not contain halogen additives and retains other key characteristics, can meet the performance of UL 94V-0 in the application of electronic winding drums, connectors and equipment frames. So far, PBT doped materials are difficult to achieve the above goals, so nylon 6 and nylon 66 began to receive attention in these applications

RTP and its partner EPCOS GmbH, an electronic equipment manufacturer in Munich, Germany, have developed halogen-free polyester with good electrical properties, 22000 pounds per square foot elastic modulus and 410F HDT at 264 pounds per square foot

Paul Killian, the production manager of RTP, believes that these products are technically very successful, but he also mentioned that the sales of products are very frustrating. Killian believes that higher costs and the slow acceptance of halogen-free products across the United States have hindered the further expansion of PTT applications. RTP's 4700 series PTT products also use halogen and glass to increase strength and lubrication, and carbon fiber to enhance traditional factors such as conductivity and antistatic property

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