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36results about How to "Suppress overlap" patented technology

Preparation method for nano-zinc oxide modified graphene hybrid material

The invention discloses a preparation method for a nano-zinc oxide modified graphene hybrid material. The method includes: preparing a graphene oxide suspension solution; dissolving a zinc salt in water, adding the solution into the graphene oxide suspension solution, conducting ultrasonic treatment, adding an alkali reagent dropwise to obtain a zinc hydroxide graphene oxide suspension solution; under ultraviolet light irradiation, performing static aging to obtain a zinc hydroxide-graphene oxide gel, adding an excessive reducing agent, carrying out reaction, using water and ethanol to conduct repeated washing, and performing drying to obtain a zinc hydroxide-graphene dry gel; placing the gel in a muffle furnace, and conducting treatment at high temperature to obtain the gray nano-zinc oxide modified graphene hybrid material. The nano-zinc oxide obtained by the invention has a large specific surface area, can effectively promote vulcanization crosslinking, greatly reduces the using amount of zinc oxide, and is of great importance to full utilization of zinc resources and ecological economy. At the same time, without affecting the performance of graphene, the method is in favor of further expanding the potential application scope of graphene.
Owner:SOUTH CHINA UNIV OF TECH

A kind of preparation method of nano zinc oxide modified graphene hybrid material

The invention discloses a preparation method for a nano-zinc oxide modified graphene hybrid material. The method includes: preparing a graphene oxide suspension solution; dissolving a zinc salt in water, adding the solution into the graphene oxide suspension solution, conducting ultrasonic treatment, adding an alkali reagent dropwise to obtain a zinc hydroxide graphene oxide suspension solution; under ultraviolet light irradiation, performing static aging to obtain a zinc hydroxide-graphene oxide gel, adding an excessive reducing agent, carrying out reaction, using water and ethanol to conduct repeated washing, and performing drying to obtain a zinc hydroxide-graphene dry gel; placing the gel in a muffle furnace, and conducting treatment at high temperature to obtain the gray nano-zinc oxide modified graphene hybrid material. The nano-zinc oxide obtained by the invention has a large specific surface area, can effectively promote vulcanization crosslinking, greatly reduces the using amount of zinc oxide, and is of great importance to full utilization of zinc resources and ecological economy. At the same time, without affecting the performance of graphene, the method is in favor of further expanding the potential application scope of graphene.
Owner:SOUTH CHINA UNIV OF TECH

Preparation method and application of a ziegler-natta catalyst for efficiently preparing low-entanglement polyethylene

ActiveCN106543301BElimination of bimetallic deactivationHigh polymerization activityZiegler–Natta catalystAlcohol
The invention relates to a preparation method of a Ziegler-Natta catalyst for efficiently preparing low entanglement polyethylene and an application. The preparation method comprises the following steps that a prepared alcohol absorbing porous carrier and a prepared polyhedral oligomeric silsesquioxane molecule / Mg mixture are stirred in tetrahydrofuran and filtered, solid powder is dried until the solid powder flows freely, and a carrier used for preparing the low entanglement polyethylene catalyst is obtained; then, a carrier of an aluminium alkyl modified catalyst is prepared through the aluminium alkyl; and finally, a TiC14 tetrahydrofuran solution is added into the carrier of the aluminium alkyl modified catalyst, after stirring, the solid powder is washed by means of the tetrahydrofuran solution and dried until the solid powder flows freely, and the Ziegler-Natta catalyst for efficiently preparing the low entanglement polyethylene is obtained. POSS can be assembled into a microsphere with particle diameter being 20-100 nm in a pore passage of the porous carrier. The active points are divided effectively. The intervals between active centers are increased. The occurrence of chain overlapping in the polymerization process is restrained. The low entanglement polyethylene Ziegler-Natta can be prepared efficiently with the polymerizing temperature being higher than or equal to 60 DEG C.
Owner:宁波链增新材料科技有限公司
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