61results about How to "Short stripping time" patented technology

The invention provides a method for preparing graphene through a large-scale aqueous phase. According to the method, graphite serves as a raw material. The method comprises the following steps: intercalating the graphite by adopting an intercalator, so that interlayer spacing between graphene sheet layers is enlarged, and the interaction force between the layers is weakened; and directly treating the intercalated graphite through ultrasonic waves, stripping and uniformly dispersing the graphite in an alkaline aqueous solution with the pH value of 10-14, wherein the content of graphene in the dispersion can be over 100mg / mL (about 10 weight percent of graphene), the content of single-layer graphene in the aqueous phase dispersion is more than 90 percent, the equivalent diameter of the graphene sheet layers can be over 1-10 microns, and a graphene film formed by filtering has a complete lattice structure and high electric conductivity. The prepared high-concentration aqueous phase graphene paste can be stored for a long time and is convenient to transport and use. The method is simple in process flow, high in production efficiency, low in energy consumption and low in cost, a commercially available low-cost reagent is adopted, the reagent is easy to recover, and the production process is environment-friendly and pollution-free.

The invention belongs to the technical field of graphene and particularly relates to a grinding medium for peeling graphene by paste grinding. The grinding medium is prepared from the following components in percentage by weight: 30%-45% of an amphiphilic polymer, 25%-30% of nano modified hydrotalcite, 10%-15% of a micro-expanding agent, 5%-15% of an adhesive, 5%-10% of cyclodextrin and 5%-10% of urea. After the grinding medium and a graphite material are mixed, the graphite is peeled primarily through the surface bonding function of the grinding medium, graphite is subjected to expansion and intercalation peeling through the micro-expanding agent and a urea intercalator which are wrapped in a network structure of the grinding medium, finally, the graphite is peeled under the action of mechanical force, and the grephene is obtained. The grinding medium is used for preparation of graphene through liquid peeling, use of organic solvents is reduced, the peeling efficiency of graphene is increased by 40% or higher, and the obtained graphene with a single layer or a few layers has higher dispersion performance.

The invention provides a method for producing a wafer. The purpose of the present invention is to shorten the peeling time when a wafer is generated from the peeling of a SiC ingot. The wafer production method includes a wafer production step in which ultrasonic water is sprayed onto an end surface of an ingot on which a peeling layer is formed to peel the wafer from the ingot, thereby producing the wafer. Therefore, compared with a structure of simultaneously transmitting ultrasonic vibration to the whole end face of the ingot to strip the wafer, the stripping time can be shortened, and the ultrasonic water spraying nozzle and the ultrasonic vibration plate of the ultrasonic water spraying nozzle can be miniaturized. As a result, it is possible to achieve efficiency and cost reduction related to wafer peeling.

The invention discloses a multifunctional chorine-free and benzene-free compound paint stripper and a production method thereof. The multifunctional chorine-free and benzene-free compound paint stripper is a composition, which is characterized in that: the composition comprises the following components in part by weight: 30 to 60 parts of main solvent, 5 to 30 parts of latent solvent, 5 to 30 parts of solubilizer, 2 to 15 parts of accelerant, 2 to 15 parts of activating agent, 1 to 6 parts of osmotic agent, 0.5 to 2.5 parts of inhibitor, 1 to 8 parts of sealant, and 0.1 to 0.6 parts of thickening agent. The production method comprises the following steps: adding the main solvent in a reaction kettle; adding the latent solvent, the activating agent and the accelerant to the main solvent dropwise with stirring; stirring the mixture until the mixture is dissolved completely; adding the thickening agent and stirring the mixture until the thickening agent is dissolved; adding the thickening agent to the mixture again and mixing with the solubilizer; and finally, adding the sealant and the inhibitor and stirring the mixture uniformly. The pain stripper in the invention avoids harm to a human body, environmental pollution and causticity, and has a large foaming area, a short paint stripping time, little dosage and high frequency when demoulding. The production method in the inventionis simple in process, less in device investment, rich in raw material resource and low in product cost.

The invention discloses a method for centrifugally extracting and recovering titanium from titanium white waste sulfuric acid. The method comprises the following steps: 1) primary amine centrifugally extracts titanium in waste sulfuric acid, and performs centrifugal extraction reaction with waste sulfuric acid produced by sulfuric acid method to produce titanium dioxide; 2) dilute sulfuric acid single-stage washes the titanium-rich organic phase, and 1) The extracted titanium-rich organic phase is single-stage washed in a container with stirring equipment, the washing liquid is dilute sulfuric acid with a mass concentration of 5-10%, and the phases are separated after single-stage washing; 3) The titanium-rich organic phase is centrifugally stripped , mixing the washed titanium-rich organic phase obtained in step 2) with lye with a concentration of 0.5-1 mol / L, and performing centrifugal stripping, and stripping the titanium-rich organic phase to obtain a titanium-containing solution and a blank organic phase. The method of the present invention does not need a synergistic extraction agent, and the cost is low, and the single-stage washing process of the titanium-rich organic phase is added, which can reduce the iron content in the titanium-rich organic phase, and the titanium-rich organic phase is centrifugally stripped with lye, The stripping time is short and the stripping rate is high.

The invention discloses a graphene preparation method. The method comprises the processes of liquid phase expansion treatment, ultrasonic peeling and drying, and the ultrasonic peeling process comprises the following steps: adding a peeling solution and wormlike graphene aggregation obtained after the liquid phase expansion treatment into a tank body provided with a plurality of ultrasonic vibration rods in proportion, introducing compressed air into the tank body to bubble and stir in order to make the wormlike graphene aggregation dispersed and suspending in the peeling solution, and controlling the ultrasonic vibration rods to carry out ultrasonic vibration treatment for 0.5-20h in order to obtain a flocculent graphene suspension. The method allows the wormlike graphene aggregation to be uniformly dispersed in the peeling solution, so the peeling effect is improved, and the peeling time is shortened.