43results about How to "High knot strength" patented technology

The invention discloses a reinforced concrete prefabricated member, which comprises a prefabricated member (1). The reinforced concrete prefabricated member is characterized in that: the prefabricated member (1) is a reinforced concrete structural bearing member; steel bars (2) in the prefabricated member are arranged in a cage shape; the steel bars (2) extend out of at least one end face of the prefabricated member (1) and then are exposed to form connecting steel bars (2) connected with post poured concrete; and a concave structure (3) or/and a convex structure (4) is arranged on the connected end face of the prefabricated member (1) and the post poured concrete. The reinforced concrete prefabricated member is suitable for an assembled wallboard or an assembled house, can be used as a constructional column or a structural column, and has the advantages of stability and reliability in assembly with an adjacent assembled cast-in-place seam and cracking resistance.

The invention discloses a coating method of an antibacterial surgical suture made of a high molecular absorbable material. The method comprises the following steps of: applying a dying process to a coating process; preparing a suture woven by using a warp loom; soaking a primary suture; uniformly spraying a coating liquid onto the suture by adopting a gas-free coating process; and drying and sizing. The suture is reddish violet and fresh in color, is smooth and flexible, is easy for knotting, has high knotting strength, and has the advantages of anti-inflammation, oxidation resistance, high degradability, long tension period and the like; and the safety of a knot is enhanced. The tensile strength is kept by about 70 percent two weeks after clinical suturing; slow absorption starts four weeks later; and the suture is absorbed completely 8-10 weeks later. As proved by clinical application, the antibacterial surgical suture has a wide application range and a good effect, is free from irritability, irritation and inflammatory reactions, and has the advantages of sterilization, anti-inflammation, bacteriostatic action and the like.

The invention relates to the technical field of polytetrafluoroethylene microporous plates, in particular to a multifunctional expanded polytetrafluoroethylene plate and a laminating-compounding preparation process thereof. The polytetrafluoroethylene plate is prepared by the following steps: uniformly mixing polytetrafluoroethylene, a polytetrafluoroethylene modifier, a fiber material, titanium dioxide and an organic solvent; carrying out pre-compression molding, extruding a bar, carrying out double-screw compression molding to form a film, heating to volatilize the organic solvent, carryingout transverse and longitudinal stretching to obtain a polytetrafluoroethylene microporous film, and carrying out a laminating-compounding process on the polytetrafluoroethylene microporous film to prepare the multifunctional polytetrafluoroethylene plate with high tensile strength. The preparation method is low in preparation cost and simple in preparation process, has a good sealing performance,chemical stability, thermal stability and electrical insulating property, and also has good creep resistance, binding strength and antibacterial property.

The invention discloses a nutria tail collagen surgical suture and a preparation method thereof. The method comprises the following steps: cutting standby nutria tail tendons into thin pieces, performing enzyme treatment by a ficus proteinase solution, preparing extracted natural collagen into a spinning solution, performing forming through a solution wet-spinning technology, and performing cross-linking to prepare the nutria tail collagen surgical suture which is a continuous long filament. The surgical suture has the diameter of 0.118-0.135 mm, the knot strength of 450-510 g and the elongation rate of 10.1-12.3%. The surgical suture meets the requirements of American suture size 6/0 and is suitable for clinical suturing. Biological experiments and clinical trials prove that the nutria tail collagen surgical suture has various advantages of mild tissue reaction, naturalness, degradability, non-toxicity, stability and reliability for absorption, high tensile strength, no need of being taken out, capability of being naturally absorbed or naturally falling off, no irritation, no scars after wound healing, and the like.

The invention discloses an absorbable medical suture line with good mechanical performance. The absorbable medical suture line comprises, by weight, 100-120 parts of modified polylactic acid, 20-40 parts of polyglycollide, 4-6 parts of sorbitol, 3-5 parts of methyl methacrylate and 5-6 parts of cassia oil. The preparation method of the modified polylactic acid includes: in ice-bath, adding chitosan into perchloric acid, well mixing, dripping sorbic acid chloride, stirring, cooling, preserving heat and purifying to obtain modified chitosan; taking polyethylene glycol, feeding inert gas, heating, preserving heat until the polyethylene glycol melt, adding stannous chloride and lactide, well mixing, heating, preserving heat and stirring, and purifying to obtain intermediate material; dissolving the modified chitosan in mixed solvent, adding triethylamine, well mixing, heating, refluxing, adding the intermediate material, well mixing, continuing refluxing, purifying and drying to obtain the modified polylactic acid.

The invention discloses a drilling cast-in-place pile reinforcing mesh fixing structure and method. The structure comprises a plurality of transverse compression bars, a plurality of longitudinal compression bars, reinforcing mesh sheets, J-shaped anchor bars and fine aggregate concrete. The two ends of the transverse compression bars are implanted into slope protection piles, the plurality of longitudinal compression bars and the transverse compression bars are mutually crossed, welded and fixed, and the reinforcing mesh sheets are internally attached to the sides, facing inter-pile soil, onthe inner sides of the transverse compression bars and the longitudinal compression bars; long straight sections of the J-shaped anchor bars are implanted into the inter-pile soil, bent sections of the J-shaped anchor bars penetrate through the reinforcing mesh sheets and hook the transverse compression bars and the longitudinal compression bars, and implanting holes, where the J-shaped anchor bars are implanted, in the inter-pile soil are filled with mortar fixedly; and the fine aggregate concrete is sprayed to the sides, facing the interior of a foundation pit, on the outer sides of the transverse compression bars, the longitudinal compression bars and the reinforcing mesh sheets. The inter-pile support detailed node treatment can greatly improve the stability and safety of a pile foundation retaining wall, the inter-pile soil can be effectively fixed, and safety of foundation pit support and the overall stability of the foundation pit are ensured.

A monofilament obtained by smelt-spinning and stretching of a vinylidene fluoride resin is subjected to a high-temperature relaxation treatment for an extremely short period of 0.05-0.5 sec. within a high-temperature heating oil bath at a temperature of 140-175° C., thereby producing a vinylidene fluoride resin monofilament, which comprises a vinylidene fluoride resin having an inherent viscosity of at least 1.40 dl/g, and has a knot strength (JIS L1013) of at least 600 MPa and excellent anti-twist property represented by a twist index of at least 0.90 when measured after the monofilament being subjected to application for 1 minute of a tensile load equal to approximately 50% of a maximum tensile load (JIS K7113), removal of the load, and standing for 3 hours.

Disclosed is an application method for red mud in a red mud storage yard impermeable layer. The method comprises the steps that a foundation constructed on the flat ground is paved with the red mud with the thickness of 500 mm and then is paved with geomembranes, and the geomembranes are filled with the red mud with the thickness of 500 mm. The red mud layer needs to be ground and dried to be in the solidified state. Clay consumption can be reduced, various negative factors caused when the clay is used as an impermeable layer are avoided, and an effective way is provided for comprehensive utilization and safe storage of the red mud.

The invention discloses a composite board special for heat preservation of a building external wall and particularly relates to the technical field of heat preservation composite boards. The compositeboard comprises a composite board body. The composite board body comprises a rock wool heat preservation layer, and the rock wool heat preservation layer is provided with a reinforcement thermal insulation assembly. The reinforcement thermal insulation assembly comprises a steel plate, a vacuum layer is arranged in the steel plate, a placement groove is formed in the rock wool heat preservation layer, the steel plate is arranged in the placement grove, and first triangular reinforcement strips are fixedly arranged on the outer side of the steel plate. The composite board is extremely high instructural strength and extremely good in pressure resistance capacity and is prevented from being broken and damaged in the transportation and installation process or damaged due to the external force effect after installation. The vacuum layer is arranged in the steel plate, so that heat transfer is reduced. Since the first triangular reinforcement strips and second triangular reinforcement strips are arrayed in a crossed manner, and the contact point is extremely small, the heat transfer efficiency is further lowered, the excellent thermal insulation and heat preservation effect is achieved, and the installation and fixing effect is also good.