32results about How to "High shielding rate" patented technology

The invention discloses barium sulfate / polyvinyl alcohol composite fiber and a preparation method thereof and non-woven fabric. The composite fiber consists of the following components in percentage by mass: 20-80% of barium sulfate and 80-20% of polyvinyl alcohol. The composite fiber is prepared by blending superfine barium sulfate and polyvinyl alcohol and performing a wet spinning technology; and the prepared non-woven fabric has the characteristics of good resistance to ray radiation, good air permeability, smooth hand feeling, gentle gloss and wearing comfort and softness. The fineness of the composite fiber is 1.5-5dtex, the dry breaking strength is 2.0-8.0cN / dtex, the dry elongation at break is 15-40%, and the initial modulus reaches 60-100cN / dtex. The shielding rate of the non-woven fabric with fixed weight of 500g / m<2> and prepared from the composite fiber against medium- and low-energy X rays can exceed 70%, and the shielding rate of protective clothing can be further improved by adjusting the thickness or layer number of the fabric.

A transmittance-variable device is disclosed herein. In some embodiments, the transmittance-variable device includes a first guest host layer, a second guest host layer, and a phase difference element disposed between the first and second guest host layers, wherein each of the first and second guest host layers comprise a liquid crystal host and a dichroic dye guest, and the liquid crystal hosts are capable of being horizontally oriented such that their optical axes are horizontal to each other. The transmittance-variable device can switch between a clear state and a black state, can exhibit high transmittance in the clear state and a high shielding rate in the black state, and can exhibit a high contrast ratio even at the inclination angle. Such a transmittance-variable device can be used in architectural or automotive materials, or eyewear such as goggles for augmented reality experience or sports, sunglasses or helmets.

The invention discloses a neutron shielding material with flame-retardant and heat-insulating properties and a preparation method thereof. It is composed of Wuhe powder surface modifier; its preparation method is to add methyl vinyl silica gel and vulcanizing agent Shuangerwu into the open mill for mastication, and then mix it with neutron absorber material, flame retardant functional filler, heat insulation The mixture of functional fillers and powder surface modifiers is commonly added to the vacuum mixer for banburying, and finally the banburying product is added to the flat vulcanizer to obtain a neutron shielding material with flame-retardant and heat-insulating properties; the material has thermal Materials with neutron shielding performance have good flexibility, flame retardancy, heat insulation performance, and mechanical strength. They can not only meet the peripheral protection of nuclear instruments and equipment with complex shapes, but also are good core materials for neutron protective clothing.

The invention discloses an element gradient combined anti-radiation rubber product and a preparation method thereof, and aims to solve the problems that generally, all fillers of a conventional anti-radiation protection rubber product are mixed together and filled, the contents of different filling components are not high, the overall shielding effect can be degraded, if a shielding material is added, filler sedimentation or layering of different degrees can be caused in the product preparation process, and furthermore the physical and mechanical properties of a finished product can be also greatly degraded. The element gradient combined anti-radiation rubber product comprises N layers of single shielding layers compounded in a gradient manner, wherein N is a natural number; N is greater than or equal to 2. By adopting the element gradient combined anti-radiation rubber product disclosed by the invention, a uniform shielding effect on a wide-energy spectrum high-energy ray can be achieved, the shielding rate of gamma and X-rays is higher than 30%, and the product is friendly to human bodies and the environment. The element gradient combined anti-radiation rubber product is reasonable to design, convenient to use, good in anti-radiation effect, high in production efficiency and filler utilization rate, good in comprehensive shielding property, capable of meeting requirements on industrial, large-scale and on-batch production, relatively high in application value, and relatively good in application prospect.