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

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 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.