40results about How to "Excellent long-term heat resistance" patented technology

Disclosed is a granular polyurethane resin composition containing a thermoplastic polyurethane resin which contains a hard segment obtained by a reaction between a polyisocyanate and a chain extender. The polyisocyanate contains isocyanate groups of 1,4-bis(isocyanatomethyl)cyclohexane in an amount of not less than 50% by more relative to the total mole number of isocyanate groups.

Disclosed is a heat-curable powder coating composition that allows the formation of a coating film having outstanding long-term corrosion resistance, as well as outstanding chipping resistance, flexibility, and adhesion.

The disclosed heat-curable powder coating composition is characterized by a resin having crosslinkable functional groups that are solid at room temperature (A), a curing agent capable of reacting with said crosslinkable functional groups (B), a fibrous filler (C), and heat-expandable resin particles (D).

A material used for making hard corrugated PVC pipe is prepared from PVC (100 pts.wt.), trisalt (6.4-6.8 pts.wt.), lead stearate (0.42-0.47 pts.wt.), barium stearate (1.4-1.7 pts.wt.), stearic acid (0.42-0.47 pts.wt.), microcrystal paraffin (0.36-0.41 pts.wt.), polyvinyl wax (0.58-0.62 pts.wt.), ACR (401) (1.9-2.1 pts.wt.), chlorinated polyethylene (5.8-6.3 pts.wt.), superfine calcium carbonate (9-11 pts.wt.) and AC 316 (0.28-0.33 pts.wt.). Its advantages are high lubricating performance, impact strength, ring rigidity and Vicat softening temp, good demoulding nature, and excellent low-temp plasticity.

The invention relates to a PE-RT (polyethylene of raised temperature resistance) composition and application thereof, belonging to the field of polyethylene pipelines. The PE-RT composition is characterized by comprising the following components in parts by weight: 100 parts of PE-RT and 0.1-1.5 parts of antioxidant, wherein the PE-RT is an ethylene-hexene-1 copolymer which has a density of 0.926-0.950 g/cm<3>, a melt flow rate of 0.1-2 g/10min (190 DEG C, 2.16Kg of weights), unimodal molecular weight distribution and a relative branching degree of 0.08-0.50; and the antioxidant comprises a hindered phenol antioxidant and a phosphite antioxidant. According to the invention, the PE-RT composition having excellent mechanical properties, high-temperature creep resistance, heat aging resistance and extrusion processability is prepared from the heat-resistant ethylene-hexene copolymer, the antioxidant and other components, thereby further improving the practical performance of PE-RT pipe products. Thus, the PE-RT composition can be used for the preparation of pipe products and pipe fittings for a hot water pipeline system.

Disclosed is a polyurethane resin composition for reaction injection molding, which contains an isocyanate component containing at least one of an alicyclic polyisocyanate and an aralkyl polyisocyanate and a trimer of hexamethylene diisocyanate, and a polyol component.

The invention provides a plastic optical fiber cable comprising a plastic optical fiber having a core/clad structure, a light blocking coating layer provided around the plastic optical fiber, and a protective coating layer provided between the outermost layer of the core/clad structure and the light blocking coating layer. The outermost layer of the core/clad structure is made of a fluorine-containing olefin polymer containing at least a tetrafluoroethylene unit, the crystal melting heat of the fluorine-containing olefin polymer being 59 mJ/mg or lower. The light blocking coating layer is made of a resin primarily containing a polyamide resin, the content of polyamide resin-derived monomers and oligomers being 1.5% by weight or lower.

The invention discloses a thermochromic polypropylene composition. The thermochromic polypropylene composition comprises, by weight, 95-99 parts of polypropylene resin and 0.5-3 parts of thermochromicmicrocapsules. The core of the thermochromic microcapsule is prepared from a triphenylmethane-metal complex and the wall of the thermochromic microcapsule is synthesized from formaldehyde and melamine through polymerization according to a mole ratio of 2.5/1 to 3/1. The preparation method of the thermochromic microcapsule comprises that formaldehyde and melamine undergo an addition reaction at pHof 7.5-8.5 to produce a methylol melamine prepolymer, a triphenylmethane-metal complex is dispersed in a sodium dodecyl sulfate aqueous solution with a concentration of 0.2-1.0 wt%, the methylol melamine prepolymer is added into the solution, the pH is adjusted to 5.5-6.5 so that a microcapsule emulsion is obtained, the microcapsule emulsion undergoes a reaction at 80-90 DEG C for 3h, and the reaction product is washed, is subjected to suction filtration and is dried so that the thermochromic microcapsule is obtained. The thermochromic polypropylene composition can resist heat in a long termand can be widely used in automobile dashboards, accessory dashboards, seats, door plates, bumpers or stand columns.

The invention discloses a material special for modified polypropylene loose tubes. The material comprises, by weight, 80-90% of polypropylene, 3-9% of polyethylene, 5-15% of filling materials, 0.3-1% of antioxidant, 1-3% of nucleating agent, 0.1-0.6% of heat stabilizer, 0.1-1% of lubricating agent, 0.1-1% of oil resistant penetrant, and 0.1-1% of anti coagulation agent. As the material special for the optical cable loose tubes, the material is high in hardness and toughness, good in extrusion performance and appropriate in extrusion press; optical fiber extra length is stably controllable; good processing stability can be provided at wide cable outlet speed, and good long-term heat resistance, pressure resistance and oil resistance are provided; molecular structure is modified via material rheological property and crystallization property, so that shrinkage is reduced, the optical fiber extra length is stably controlled; relative to PBT (polybutylece terephthalate), the material is good in hydrolytic stability, needless for drying before being extruded, and is convenient to use and cost-saving.

Disclosed is a polymer composition having a semi-homogeneous phase that exhibits excellent electrical, mechanical and thermal properties while satisfying flexibility, bendability and impact resistance. More specifically, disclosed is a polymer composition having a morphology in which a rubber-phase filler of a propylene copolymer is dispersed in a matrix of polypropylene, wherein an elution rate of the rubber-phase filler in a xylene-based solvent is less than 50%, based on the content of the rubber-phase filler such that the rubber-phase filler forms a semi-homogeneous phase with the matrix.

The invention relates to a polyamide composition, a method for producing the same, and a molded article. Provided is a polyamide composition which does not contain halogen, but has excellent flame retardancy and good long-term heat resistance when formed into a molded article. The polyamide composition containes (A) an aliphatic polyamide; (B) a semi-aromatic polyamide containing a diamine unit and a dicarboxylic acid unit; (C) at least one phosphinic acid salt selected from the group consisting of phosphinic acid salts represented by general formula (1), diphosphinic acid salts represented bygeneral formula (2), and condensates thereof; and (D) a polymer having an oxygen index of 27% or more and having an aromatic group in the main chain, the content of the polymer (D) being 0.1-8% by mass relative to the total mass of the aliphatic polyamide (A), the semi-aromatic polyamide (B), the phosphinic acid salt (C), and the polymer (D).

Provided is a polyphenylene sulfide fiber for which changes in fiber structure are small and which has excellent long-term heat resistance. That is, the present invention is a polyphenylene sulfide fiber characterized in that the degree of crystallinity is at least 45.0%, the amount of mobile amorphous phases is not more than 15.0%, and the weight average molecular weight is not more than 300,000.

The invention provides a high polymer heat-resistant polyvinyl chloride based on a multi-element rare earth heat stabilizer, the polyvinyl chloride includes high molecular weight polyethylene, trioctyl trimellitate, liquid barium zinc, a multi-element rare earth heat stabilizer and low Molecular polyethylene wax, wherein the preparation method of the multi-element rare earth heat stabilizer is: under an inert environment, add palladium chloride and triphenylphosphine into n-hexane, stir evenly, add 4-bromopropiophenone, and then drop three Phenyl lanthanum solution, continue to react after the dropwise addition, separate and purify to obtain the multi-element rare earth lanthanum palladium metal compound; add the multi-element rare earth lanthanum palladium metal compound into nitric acid and stir, and mix rapidly with the ethanol mixed solution of malic acid and salicylic acid, then drop Add sodium hydroxide aqueous solution, heat to react, vacuum filter, wash and dry to obtain multi-element rare earth heat stabilizer. The polyvinyl chloride prepared by the invention has a high degree of polymerization, good synergistic effect among various components, and can remarkably improve the heat resistance, mechanical properties, corrosion resistance and other properties of the polyvinyl chloride material.

Provided is an optical fiber cable having excellent flame retardancy, long-term heat resistance and mechanical characteristics. An optical fiber cable according to the present invention comprises an optical fiber and a cladding layer that is provided on the outer circumference of the optical fiber. The cladding layer contains a chlorinated polyolefin resin (A) and a polyolefin resin (B).