93results about How to "Good industrial production base" patented technology

The invention discloses a preparation method of a hollow fiber composite nano-filtration membrane. The preparation method comprises: immersing an outer surface of a hollow fiber supporting membrane into a water solution A containing a polyphenol compound and a multi-amino compound; injecting a water solution B containing an oxidant into the hollow fiber supporting membrane; reacting at 0 to 95 DEG C for 1min to 300min and taking out the hollow fiber supporting membrane; draining a solution on the surface of the hollow fiber supporting membrane; carrying out drying treatment to obtain the hollow fiber composite nano-filtration membrane. The preparation method can be widely applied to preparation of hollow fiber composite nano-filtration membranes with different base membranes, and rejection performance of the prepared composite nano-filtration membrane is not influenced by base membrane structures; the preparation method is simple in operation process and moderate in reaction conditions, is suitable for continuous production, and has a good industrial production foundation and a wide application prospect.

The invention belongs to the technical field of a heat conduction polymer composite material, and particularly relates to an epoxy composite material with high heat conductivity and a preparation method thereof. Firstly, electronegative graphene oxide nanosheets or boron nitride nanosheets are repeatedly deposited on the surface of commercial melamine sponge through layer-by-layer self assembly; a composite sponge framework with a three-dimensional filling network is formed; then, the composite sponge is subjected to epoxy resin encapsulation; the final heat conduction composite material is obtained. The materials can build and form a three-dimensional heat conduction network under the condition of extremely low filling adding quantity; when the boron nitride content is 1.7 weight percent and the graphene content is 0.74 weight percent, the heat conductivity in the vertical surface of the materials respectively reaches 0.62 W / Mk and 0.73 W / Mk. The method has the advantages that the operation is simple; the production cost is very low; the batch and scale production is easily realized; wide application prospects are realized.

The invention discloses a zirconium-aluminum-titanium complex tanning agent based less-chrome tanning method which is characterized in that a zirconium-aluminum-titanium complex tanning agent and a chrome tanning agent are combined to tan pigskin, cow leather and sheepskin, wherein the shrinkage temperature of industrially produced crust leather can reach 95 DEG C; the leather can be saved for a long time without detanning; the leather is full, the appearance of the leather is in shallow lake blue, and all physical and mechanical performance indexes can reach the industrial standard; and pickling is avoided so as to avoid chloride ion pollution, phosphorous pollution and the release of formaldehyde. Due to the adoption of the method, the chrome tanning agent can be saved by more than 50 percent, and the Cr2O3 content in the waste tanning liquor is smaller than 50 mg / L, as a result, the pollution for human and environment of the heavy metal chromium in leather waste and in the leather production process is greatly reduced. Therefore, the method opens a new way for tanneries and fur factories to produce less-chrome tanned leather and fur.

The invention relates to an antibacterial composite nanofiltration membrane. The antibacterial composite nanofiltration membrane comprises a porous supporting layer and a polyamide functional layer, wherein the polyamide functional layer comprises attapulgite-nanometer silver composite inorganic powder; and in the attapulgite-nanometer silver composite inorganic powder, the mass ratio of silver to attapulgite is 10 / 100 to 100 / 100, and the particle size of the nanometer silver is 3 to 100 nm. The invention also relates to a preparation method and an application of the above-mentioned antibacterial composite nanofiltration membrane. The antibacterial composite nanofiltration membrane provided by the invention has the advantages of high flux, high rejection rate, good antibacterial properties, stable membrane structure, high operation efficiency and long service life.

The invention discloses a totally enclosed less-chrome tanning circulation technique based on a zirconium-aluminum-titanium cooperation tanning agent, characterized in that the tanning system is formed into a totally enclosed circulation system so as to realize recycling of waste tanning liquid and thoroughly eliminate pollution caused by heavy metal chrome while greatly reducing the dosage of the chrome tanning agent. The technique has the advantages that no new material is added, the tanning liquid has stable components, no secondary pollution is caused, the investment is low and the operation is simple; the dosage of the zirconium-aluminum-titanium cooperation tanning agent and the dosage of the chrome agent are low, and the total dosage of two tanning agents is lower than 9%; the material cost is low and the utilization rate of the chrome salt is higher than 99%; the industrially produced crust leather has the shrinkage temperature of higher than 90 DEG C, and thus can be stored for a long time without deannage, and is excellent in water washing resistance; the grain side of the crust leather is fine, full and elastic and not easy to become loose; the leather body is light in color and excellent in dyeing property, and can be fabricated into different types of leather; and the solid waste is less in chrome content, thereby being convenient for recycling.

The invention belongs to the technical field of membranes, and specifically relates to a sulfonated oxidized graphene-silicon dioxide composition / polymer hybridized proton exchange membrane and a preparation method thereof. According to the invention, a sulfonated oxidized graphene-silicon dioxide composition is uniformly dispersed in a polymer matrix, and the proton conductivity of the sulfonated oxidized graphene-silicon dioxide composition / polymer hybridized proton exchange membrane prepared by the method is extremely improved compared with a pure polymer proton exchange membrane, and particularly, the proton conductivity is exponentially improved or even improved to an order of magnitudes under a high temperature environment and / or a low humidity environment. Meanwhile, even in the severe condition of high temperature and / or high methanol concentration, the methanol permeability is further greatly reduced, namely, the sulfonated oxidized graphene-silicon dioxide composition / polymer hybridized proton exchange membrane prepared by the method has extremely excellent selectivity. In addition, the method provided by the invention is simple in operational process, mild in preparation condition, lower in production cost and easy for massive and scaled production, and has a good industrial production basis and a wide application prospect.