3results about How to "Permeable" patented technology

The application provides a jacquard needle wire protection structure, and relates to the field of jacquard needles.The jacquard needle body is characterized in that a plurality of FCC wires are connected to one side of the jacquard needle body, a protective net is arranged on the FCC wires, silica gel is filled between the FCC wires and the protective net, a tail wire clamp is arranged on the jacquard needle body, the tail wire clamp covers the protective net, silica gel is filled between the protective net and the tail wire clamp, a rolling belt is connected between the tail wire clamp and the protective net, and a pair of nuts are connected between the jacquard needle body and the tail wire clamp.The application has the following advantages: the structure forms a relatively closed and elastic stress isolation area at the ceramic piece end of the wire, effectively blocks the transmission of external equipment vibration to the wire, avoids internal stress concentration and fatigue fracture of the FCC wire due to resonance, and significantly improves the reliability and service life of the wire in a high-voltage (DC 200V) working environment.

This invention discloses a synergistic hydraulic permeability enhancement and semi-permeable membrane-enhanced gas extraction system and method, belonging to the field of low-permeability coal seam gas extraction technology. The system comprises a dual-casing structure, hydraulic permeability enhancement drive, semi-permeable membrane negative pressure gradient extraction, and recovery circulation systems. The dual-casing structure mainly consists of a main water injection pipe and multiple outer casings, a main extraction pipe and multiple inner casings. The outer casings are equipped with jet nozzles, and the inner casings have gas extraction holes covered by a polytetrafluoroethylene (PTFE) semi-permeable membrane. The dual-casing structure system combines permeability enhancement and extraction functions. Precise hydraulic permeability enhancement is achieved through the outer casings, while the inner casings utilize the selective permeability characteristics of the semi-permeable membrane to enhance gas extraction, thus solving the problems of short permeability enhancement efficiency, low extraction efficiency, and poor sealing performance in traditional technologies. This invention is suitable for efficient gas extraction and coal seam permeability enhancement in high-stress, low-permeability coal seams, ensuring safe coal mine production and improving coalbed methane resource utilization.

The application relates to the technical field of membranes, in particular to an antibacterial nanofiltration membrane and a preparation method thereof. The method comprises the following steps: polyethylene imine / tannic acid pretreatment is carried out on a polyethersulfone sulfone ultrafiltration membrane substrate; first interfacial polymerization of a water phase containing piperazine, guanidino butylamine sulfate and taurine and an organic phase containing trimesoyl chloride is sequentially carried out; secondary water phase back immersion is carried out by using a taurine solution; a cross-linking anchoring agent with 20%-22% maleimide double bonds is prepared; the cross-linking anchoring agent is used for anchoring-densification treatment together with trimesoyl chloride; and finally, acid / alkali alternation and heat curing are carried out. Through unique step design and function component synergy, a stable antibacterial and anti-pollution structure is constructed in the separation layer, and the problems of easy biological pollution and easy loss of antibacterial agents of traditional nanofiltration membranes are solved. The obtained membrane has long-acting antibacterial property, high flux recovery rate, high ion selectivity and excellent acid / alkali cycle stability.