40results about How to "Good biological inertia" patented technology

The invention discloses modified polyolefin paper without plant fiber. The modified polyolefin paper is formed by a first matrix layer without the plant fiber, a second matrix layer without the plant fiber and a third matrix layer without the plant fiber which are compounded into a whole, wherein the first matrix layer and the third matrix layer are respectively prepared by 20 to 30 percent of ethylene-acrylic acid modified copolymer EAA, 45 to 60 percent of metallocene high-density polyethylene mHDPE, and 20 to 25 percent of activated ultrafine inorganic powder by using an aluminate F-2 type coupling agent, and the second matrix layer is prepared by 60 to 90 percent of activated ultrafine inorganic powder, 2 to 5 percent of maleic anhydride and 8 to 35 percent of high-density polyethylene. The modified polyolefin paper has the advantages of good ink receptivity and softness. Therefore, the modified polyolefin paper can not only be used as industrial paper, packing paper and household paper, but also be used as cultural paper, and enlarges the use range. The modified polyolefin paper has higher foldability and rigidity, has the longitudinal and transverse tearing strength which are superior to those of plant fiber paper, has good surface flattening, good handwriting, and clear printing performance, saves printing ink, has simple production technology, protects forest resources, saves energy sources and water, reduces the discharge of organic chlorides and harmful gas, has no waste, and protects the environment.

The invention relates to calcium silicate high-filling polymer modified paper, which is compounded and formed by three layers of non-plant fiber calcium silicate paper substrates, wherein the first layer and the third layer are prepared from 2 to 6 percent of ethylene bis stearamide, 8 to 23 percent of high-density polyethylene, 3 to 9 percent of metallocene polyethylene, 0 to 1 percent of low-molecular polyethylene, 50 to 60 percent of activated calcium silicate, 10 to 25 percent of calcium silicate inorganic powder and 0 to 3 percent of addition agents, the first layer and the third layer accounts for 25 percent of the weight of the paper, the second layer is prepared from 50 to 60 percent of activated calcium silicate powder, 10 to 25 percent of calcium silicate, 2 to 9 percent of styrene-butadiene block copolymer, 7 to 21 percent of high-intensity polyethylene materials, 4 to 8 percent of linear low-intensity polyethylene and 0 to 3 percent of addition agents, and the second layer accounts for 50 percent of the weight of the paper. The modified paper has the same appearance, whiteness, sizing degree, opacity, strength, toughness and rigidity as plant fiber paper and has simple production processes, no bacteria and poison; and because the product is used for packing paper and can replace the traditional plastic packing paper, a great amount of petroleum can be saved.

The invention relates to a three-layer coextrusion film for medical infusion, which is low in cost, nontoxic, good in bonding property, air barrier property, flexibility and weatherability, high in heat-seal strength and transparency and easy to process, and comprises an inner layer A, a bonding layer B and an outer layer C, wherein the inner layer A is made from polypropylene random copolymer that is good in heat sealability and flexibility and high in transparency; the bonding layer B is made from ethylene-vinyl acetate copolymer containing 10%-40% of vinyl acetate; the outer layer C is a weather-proof layer and is made from PVC (polyvinyl chloride) resin that is low in cost, weather-proof, transparent and soft; and the mass of a plasticizer accounts for 30%-60% of that of the outer layer C. A three-layer coextrusion casting unit is the main production equipment of the film, the interface instability due to unmatched rheology in multilayer coextrusion is effectively avoided by controlling the processing temperature and processing flowability of all layers of resin materials, and the production efficiency and product quality are greatly improved.

The invention relates to a preparation method of injectable double-cross-linked hydrogel for tissue engineering, which comprises the following steps that: an aqueous solution of aminated gelatin, an aqueous solution of aldehyde dextran, and an aqueous solution of terminated vinyl poly ethylene glycol are mixed according to a volume ratio of 4:4:3, then are cross-linked for 10-20 minutes at a temperature of 35 to 40 DED C, and finally are cross-linked for 3 to 8 minutes by ultraviolet irradiation. The preparation method provided by the invention has a simple operation process and mild implementation conditions; and the double-cross-linked hydrogel obtained by the invention is non-toxic and biodegradable, has good mechanical properties and biocompatibility, and can be used for injectable hydrogel scaffold in the tissue engineering.