31results about How to "High elastic rate" patented technology

A guide wire that due to its wide elastic region and high Young's modulus, simultaneously has pliability and pushability, and that even when its surface is coated with a plastic material of high melting point, is highly impervious to influences of heat treatment, and that has excellent slidability and excels in weldability between a distal-end-side base material and a proximal-end-side core material. The guide wire has a core material comprising a distal-end-side core material and a proximal-end-side core material. The distal-end-side core material is made of an iron alloy having shape memorycapability and superelasticity, consisting essentially of two phases of gamma-phase and gamma'-phase and exhibiting, in a thermal hysteresis of martensite transformation and reverse transformation, adifference between reverse transformation completion temperature (Af-point) and martensite transformation starting temperature (Ms-point) of 100 DEG C or below. The proximal-end-side core material ismade of an alloy containing iron and has an elastic modulus higher than that of the distal-end-side core material. The distal-end-side core material and the proximal-end-side core material are weldedtogether.

The invention discloses a three-dimensional porous fibrous skeleton as well as a preparation method and application of the three-dimensional porous fibrous skeleton. The three-dimensional porous fibrous skeleton is prepared by virtue of the following steps: dissolving poly(3-hydroxybutyrate-co-4-hydroxybutyrate) in the mixed solution of chloroform and acetone to obtain a spinning solution in which the concentration of the polymer is 6wt%-12wt%; collecting on a tin foil by virtue of an electrostatic spinning process to obtain a fibrous membrane, winding the fibrous membrane by use of a glass rod, and unwinding the fibrous membrane from the glass rod after drying and flushing with ethanol, thereby obtaining the three-dimensional expansible porous fibrous skeleton. The three-dimensional porous fibrous skeleton has excellent biodegradability, biocompatibility and elastic property; when the three-dimensional porous fibrous skeleton is applied to the operative treatment of vertebral compression fracture caused by osteoporosis as a sacculus, the problems of bone cement leakage and easy collapse of calcium phosphate bone cement under 100% humidity can be effectively solved; as a result, the three-dimensional porous fibrous skeleton plays an important role in reducing the risk of the percutaneous kyphoplasty and popularizing and utilizing the calcium phosphate bone cement.

The invention discloses a preparation method of flame-retardant modified polyacrylonitrile fiber. The method comprises the following steps of firstly, carrying out surface treatment on borate whiskers by using a silane coupling agent to obtain silanized borate whiskers; then blending the silanized borate whiskers and polyacrylonitrile to prepare polyacrylonitrile fiber; then grafting the polyacrylonitrile fiber with methyl methacrylate by using an ultraviolet grafting technology to obtain modified polyacrylonitrile fiber; and finally reacting the modified polyacrylonitrile fiber with phosphoric acid and urea to obtain the flame-retardant modified polyacrylonitrile fiber. According to the invention, the borate whiskers are introduced into the polyacrylonitrile, so that the mechanical strength and thermal conductivity of the fiber are effectively improved; and the methyl methacrylate is grafted on the surface of the polyacrylonitrile fiber through chemical grafting and interacts with the phosphoric acid and the urea, and flame-retardant phosphorus and nitrogen elements are introduced into the surface of fiber molecule, so that the flame retardance of the modified polyacrylonitrile fiber is effectively improved.

The invention provides a magnesium alloy for bicycles, the components and mass fractions of which are as follows: the Mg content is 90-92%, the Al content is 3-5%, the Mn content is 3-3.5%, and the rest is Ca. The beneficial effect of the invention is that adding aluminum element to the material components of the magnesium alloy improves the elastic modulus of the alloy material without affecting the stiffness of the magnesium alloy.

This invention provides a twist yarn made of a polyoxymethylene resin having excellent durability and high strength/high modulus. The twist yarn made of the polyoxymethylene resin is obtained by twisting a plurality of single yarns or multifilaments composed of a polyoxymethylene copolymer containing a specific oxyalkylene unit in an amount of 0.5-10 mol per 100 mol oxymethylene unit in a polymer chain mainly composed of a recurring oxymethylene unit and having 0.3-70g/10 min melt index (160 load at 190[deg.]C).