2148 results about "Polyethylene terephtalate" patented technology

A sports shoe includes an upper wherein a majority by weight of the upper is made from a thermoplastic base material and a sole wherein a majority by weight of the sole is made from the same thermoplastic base material. The sole and the upper are individually fabricated and joined to each other. The thermoplastic base material includes at least one of the following materials: thermoplastic polyurethane TPU, polyamide PA, polyethylene terephthalate PET, or polybutylene terephthalate PBT.

A thermoplastic molding composition having improved flammability rating and mechanical properties is disclosed. The composition contains aromatic polycarbonate having a weight-average molecular weight M_w≧25,000 g/mol., polyalkylene terephthalate, graft (co)polymer characterized in that its grafted phase includes structural units derived from acrylate monomers, an oligomeric organic phosphoric acid ester, and an optional fluorinated polyolefin. In a preferred embodiment the graft (co)polymer is characterized in its core-shell morphology.

The process of preparing PDT copolyester fiber includes the following steps: 1. saccharifying and catalytically hydrogenating corn starch to prepare sorbitol, catalytically hydrogenating to prepare multicomponent mixed alcohol, and fractionating in a fractionating tower at 182-212 deg.c to obtain corn-base ethylene glycol product of 89-99 % content and with ethylene glycol as main component and other diols; 2. detecting the contents of component diols in the ethylene glycol product and adding insufficient components for content fluctuation controlled within 10-30 %; and 3. adding nanometer titania in 0.05-1 wt% into the corn-base ethylene glycol product, and copolymerizing together with terephthalic acid at 280-288 deg.c for 5-7 hr to prepare PDT copolyester. The process is suitable for industrial production.

The invention relates to a low warping high surface gloss glass fiber reinforced polyester composite material and preparation method thereof. The composite material comprises the following components (wt%): 10-35% of polycarbonate, 20-45% of polybutylece terephthalate, 1-10% of flexibilizer, 3-10% of kaolin and 15-38% of glass fiber; 0.1-1% of antioxidant, 0.1-0.5% of ester exchange inhibiting agent and 0.1-3% of processing agent are prepared, silane coupling agent is utilized to process kaolin, then raw materials are placed into a mixing machine to be mixed for 2-5min, then mixture is placed into a screw machine for extrusion granulation, and meanwhile side charging is carried out on the glass fiber, the rotating speed of screw machine is 180-600rpm, and temperature is 240-280 DEG C, thus obtaining the product. The invention can obtain products with high surface gloss, excellent comprehensive mechanical properties and dimensional stability and especially ensures low warping property of product when being produced into injection moulding product.

A multi-layer screen protector for digital display screens, such as LCD's, cell phones, tablets, laptops, and pad computer devices, that may be readily applied without the need for special tools and in dusty environments, the screen protector being designed and die-cut to match the shape of the digital display screen, including cut-outs for cameras, microphones and device buttons, where the top surface is a layer of polycaprolactone aliphatic urethane that is connected to a bottom layer made from plastic such as polystyrene, acrylic and/or polyethylene terephthalate, and a self-wetting adhesive layer provided on the bottom surface of the bottom polystyrene, acrylic and/or polyethylene terephthalate layer. The screen protector provides an optically clear view of the device and is constructed with the abrasion resistant layer being provided and supported on a plastic layer and may be removed and reinstalled.

The invention discloses a controllable bio-based full-degradable mulching film which is prepared from the following raw materials in parts by weight: 15-60 parts of polylactic acid (PLA), 40-85 parts of polyterephthalic acid-butanediol adipate, 0.1-0.5 part of reactive assistant, 0.1-0.5 part of antioxidant, 0.1-0.5 part of lubricant, 0.1-0.5 part of ultraviolet absorbent and 0.1-0.5 part of light stabilizer. The novel reactive assistant is adopted to solve the problem of interface compatibility between PLA and PBAT; by adjusting the PLA/PBAT proportion and adding other ultraviolet absorbents and light stabilizers, the problem of controllability on mulching film degradation period is solved; and by utilizing the characteristic of high mechanical strength of the PLA in combination with favorable flexibility of the PBAT, the controllable-degradation-period full-biodegradable low-cost agricultural mulching film based on PLA multielement composite modification technique, of which the thickness is down to 6 mu m and the maximum bio-base content is up to 60%, is developed. The controllable bio-based full-degradable mulching film has favorable quality, and has wide popularization application prospects in promoting national soil pollution treatment and developing ecological agriculture.

The invention provides 2,5-furandicarboxylic-terephthalic-aliphatic copolyester and a preparation method thereof. 2,5-furandicarboxylic-terephthalic-aliphatic copolyester has a first repetitive unit represented by a formula (I) and a second repetitive unit represented by a formula (II), wherein x=2 to 8. The molar ratio of the first repetitive unit to the second repetitive unit is 1:1000-1000:1. 2,5-furandicarboxylic-terephthalic-aliphatic copolyester provided by the invention has a structure and even a good performance similar to that of diol polyterephthalate. 2,5-furandicarboxylic-terephthalic-aliphatic copolyester can be used for preparing materials such as engineering plastics and membranes. As one of the raw materials, 2,5-furandicarboxylic acid can be obtained based on renewable resources, such that the resource is wide, and is not influenced by increasingly exhausted petroleum resources. The invention also provides a preparation method of 2,5-furandicarboxylic-terephthalic-aliphatic copolyester.

A molding composition comprising (a) from 5 to 90 wt % of a modified polybutylene terephthalate random copolymer that (1) is derived from polyethylene terephthalate component selected from the group consisting of polyethylene terephthalate and polyethylene terephthalate copolymers and (2) at least one residue derived from the polyethylene terephthalate component, and (b) from 5 to 40 wt % of a polyalkylene terephthalate component; wherein the modified polybutylene terephthalate random copolymer, the polyalkylene terephthalate component, and optionally, at least one additive, have a combined weight % of 100 wt %. Methods for making the composition and articles made from the composition.

The invention relates to a preparation method of polybutylene terephthalate/adipate butanediol copolyester, which utilizes a titanium compound and an antimony compound as the composite catalyst, the mole ratio of terephthalic acid to adipate is 3:7-8:2, the ratio of the total mole of the terephthalic acid and the adipate to the mole of 1,4-butanediol is 1:1.0-1.8, esterification is carried out at normal pressure and the temperature of 150-220 DEG C, the pressure is reduced to high vacuum 10-150 Pa for the reaction, the final temperature for the reaction is 265-280 DEG C, and inert gas is utilized to recover the pressure to be normal to obtain the copolyester. The reaction time is shortened, the production amount of tetrahydrofuran is small, the intrinsic viscosity of copolyester chips is 0.90-1.32 dL/g, the hue b value of the product is between 0 and 8, the L value is between 68 and 85, and the product of the polybutylene terephthalate/adipate butanediol copolyester can be used in the fields of various soft package plastic products.

The invention provides an engineering plastic with high wearing resistance. The engineering plastic is made from the following raw materials by weight: 80-100 parts of polyformaldehyde, 20-40 parts of polyamide, 20-50 parts of polycarbonate, 25-40 parts of acrylonitrile-butadiene-styrene copolymer, 10-30 parts of epoxy resin, 12-20 parts of polytrimethylene terephthalate, 1-5 parts of diphenylmethane bismaleimide, 10-15 parts of polyphenyl ether, 20-40 parts of polyether-ether-ketone, 10-20 parts of polytetrafluoroethylene, 5-10 parts of melamine, 4-12 parts of boric acid alkanolamide, 2-6 parts of polyethylene glycol, 4-12 parts of phenolic ether phosphomonoester, 5-15 parts of polymethyl methacrylate, 10-20 parts of organic silicone oil, 5-10 parts of silane coupling agent, 3-5 parts of zinc stearate, 10-20 parts of glass fibre, 12-20 parts of graphite, 5-10 parts of silicon carbide whisker, 5-8 parts of nanometre titanium oxide, 4-6 parts of diphenyl ketone, 3-8 parts of butylated hydroxyanisole and 15-30 parts of filler. The engineering plastic provided by the invention has a good wear-resisting property.

The invention discloses a transparent flexible surface enhanced Raman active substrate and a preparation method thereof. The preparation method of the substrate comprises the following steps: taking a transparent flexible material such as polybutylene terephthalate (PET) plastics as a substrate, performing O2 plasma etching to form a nano wire array, loading gold, silver and other precious metal nanoparticles on the nano wire surface by virtue of a coating technology, and forming a three-dimensional nanometer structure array. The transparent flexible surface enhanced Raman active substrate provided by the invention is uniform in morphology and controllable in structure and has high-density electromagnetic hot spots in three-dimensional distribution. Therefore, the substrate has high sensitivity and reproducibility. The PET plastic film is high in flexibility and high in transparency, and incident laser and Raman scattered light easily penetrate through the substrate at low loss, so that the substrate can be used for in-situ detection of to-be-detected objects. The preparation method provided by the invention is simple in process, large-area preparation is easily realized, even roll-to-roll production process is permitted, and the cost is low.

The present invention provides a method of producing polyalkylene terephthalate, which comprises: introducing a prepolymer of polyalkylene terephthalate that is in a molten state comprising 70 mol % or more of ethylene terephthalate or 1,4-butylene terephthalate repeating units and having an intrinsic viscosity [η] between 0.2 and 2 dl/g through a feed opening to a polymerization reactor; discharging the introduced prepolymer from holes of a perforated plate; and polymerizing the prepolymer under reduced pressure, while allowing the prepolymer to fall along the surface of a support that is open towards the outside at a temperature between the [crystalline melting point−10° C.] of the prepolymer or higher and the [crystalline melting point+30° C.] of the prepolymer or lower under the conditions represented by a formula S₁/S₂>1, wherein S₁ is the surface area of falling polyalkylene terephthalate, and S₂ is the area where the support is in contact with polyalkylene terephthalate.

The invention discloses a low-melting point and transparent PET (polyethylene terephthalate) copolyester, its preparation method and application. The PET copolyester comprises, by mass: 60-84% of PET, 10%-30% of a unit derived from isophthalic acid, 5%-29% of a crystallization adjusting agent, and 0.03-2% of a branching agent. According to the preparation method, in a synthesis process of PET, based on p-phthalic acid (PTA) and ethylene glycol (EG), the unit derived from isophthalic acid, the crystallization adjusting agent and the branching agent are added to undergo a chemical reaction together, thus obtaining the low-melting point and transparent PET copolyester. The PET copolyester provided by the invention has an intrinsic viscosity greater than 0.9dL/g and a melting point lower than 230DEG C, can be solidified into an amorphous state from a molten state during injection molding, and has good transparency as well as further improved processing performance.

The invention discloses halogen-free stibium-free antiflaming polydiethylene terephthalate engineering plastics and a method for preparing the same. The plastics consist of the following components in percentage by weight: 39 to 65 percent of polydiethylene terephthalate, 15 to 40 percent of reinforcing agent, 0 to 8 percent of toughening agent, 5 to 8 percent of phosphorus flame retardant, 0 to 8 percent of nitrogen flame retardant, 0 to 4 percent of synergetic flame retardant, 0 to 0.5 percent of nucleating agent and 0 to 0.5 percent of antioxidant. In the preparation method, the phosphorus-nitrogen antiflaming system is combined with the nanometer clay, so that while the halogen-free stibium-free flame retardation of the compound material is realized, the higher CTI value of the antiflaming material is ensured; the plastics are applicable in the field of electric appliances; and the method for preparing the material is simple and avoids adopting mould temperature forming processing, and the compound material possesses excellent thermal stability and therefore can be recycled.

The invention discloses a waterproof rubber material. The waterproof rubber material is prepared from the following raw materials by weight: 7 to 8 parts of polyethylene glycol terephthalate, 3 to 4 parts of trioctyl citrate, 1 to 2 parts of rosin, 24 to 27 parts of polyacrylonitrile, 1 to 2 parts of sodium diacetate, 12 to 13 parts of graphite, 3 to 4 parts of fly ash bead, 0.7 to 1 part of sodium dodecyl sulfate, 42 to 55 parts of liquid acrylonitrile-butadiene rubber, 0.6 to 1 part of methacrylic acid, 52 to 60 parts of acrylonitrile-butadiene rubber, 20 to 255 parts of butadiene styrene rubber, 5 to 6 parts of nanometer silica sol, 3 to 4 parts of tetramethyl-thiuram disulfide, 2 to 3 parts of diglycol, 6 to 8 parts of VAE emulsion, 14 to 16 parts of activated clay, 5 to 7 parts of barium titanate, 7 to 9 parts of magnesium hydroxide and 0.2 to 0.3 part of calcium propionate. The waterproof rubber material prepared in the invention has good waterproof performance and acid resistance, oil resistance and flame retardation performance, can perfectly meet requirements of production and is worth popularization.

The present invention relates to polycarbonate compositions comprising

• • A) from 10 to 99 parts by weight, in each ease based on the sum of components A+B+C, of aromatic polycarbonate and/or aromatic polyester carbonate,
  • B) from 1 to 35 parts by weight, in each case based on the sum of components A+B+C, of rubber-modified graft polymer of
    • B.1 from 5 to 95 wt. % of at least one vinyl monomer on
    • B.2 from 95 to 5 wt. % of one or more graft bases having a glass transition temperature <10° C.,
  • C) from 0 to 40 parts by weight, in each case based on the sum of components A+B+C, of vinyl (co)polymer and/or polyalkylene terephthalate,
  • D) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of phosphorus-containing flameproofing agent,
  • E) from 0 to 1.0 part by weight, in each case based on the sum of components A+B+C, of acidic additives, and
  • F) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of additives,
  • wherein component B is obtainable by reacting component B.1 with the graft base B.2 by means of emulsion polymerization, with the proviso that in those compositions that are free of components D) and E), the graft polymer dispersion in the spray drying or in the precipitation has a pH value of less than 7,
  • characterized in that there are used in the graft reaction from 0.1 to 5 parts by weight (based on the sum of the parts by weight of the monomers B.1 and of the graft base B.2 that are used=100 parts by weight) of at least one emulsifier selected from the group consisting of alkali, alkaline earth, ammonium and phosphonium salts of a saturated fatty acid having from 10 to 50 carbon atoms, wherein the emulsifier or emulsifiers remains or remain in component B,

and also to a process for the preparation of these polycarbonate compositions and to the use of the polycarbonate compositions in the production of molded bodies, and to the molded bodies themselves.

The invention discloses a preparation method of a foamable polyethylene terephthalate copolyester. The preparation method comprises the following steps: carrying out an esterifying reaction of terephthalic acid and glycol, and carrying out a condensation polymerization reaction, wherein diacids except terephthalic acid, polyprotic acid containing more than two functional groups, and polybasic acid anhydride or polyol are added in the esterifying reaction. A resin prepared through the method has the advantages of high melt strength, high mechanical performances, high heat resistance, direct extrusion foaming, low temperature of the foaming processing technology, and production energy consumption reduction.

A pleated filter structure includes a pleated filtering substrate and a pleated, polymer, mesh reinforcing sheet or netting for assisting in maintaining the pleated configuration of the filtering substrate. The pleated, polymer, mesh reinforcing sheet or netting includes a mechanically degraded polyalkylene terephthalate as the primary polymer therein. A method of making the pleated filter structure includes the steps of obtaining commercial articles having been made from a high crystallinity, flexible polyalkylene terephthalate; and mechanically degrading said articles to decrease the crystallinity and increase the stiffness of the polyalkylene terephthalate and extruding the mechanically degraded articles into an extruded structure stiffer and more amorphous than the polyalkylene terephthalate in the commercial articles.

The invention discloses a preparation method of novel wool-like differential fibers, which is characterized by comprising the following steps of: 1) adopting polytrimethylene terephthalate (PTT) as a raw material to prepare a pre-oriented yarn (a); 2) adopting modified high-shrinkage polyester as a raw material to prepare fully-drawn high boiling water shrinkage fibers (b); and 3) on a DTY machine, passing the pre-oriented yarn (a) through a roller, a hot box and a cooling plate, performing drawing false twisting on the pre-oriented yarn on a false twister, converging the pre-oriented yarn with the high boiling water shrinkage fibers (b) in front of two rollers, and performing network compounding on the pre-oriented yarn and the high boiling water shrinkage fibers, and then passing the pre-oriented yarn and the high boiling water shrinkage fibers through two hot boxes to obtain a composite yarn product. The preparation method develops the novel wool-like differential fibers, the PTT fibers floating on the surface layer are much closer to wool fibers in performance and are superior to common wool-like products in the performance of elastic recovery, handfeel, antistatic property, dyeing and the like, and simultaneously, the treatment of forming different sections of the two raw materials ensures that the products have significant improvements on luster and fibrillation resistance.