30results about How to "Inhibit surface activity" patented technology

The object of the invention is to provide a powder composition and a dispersion of powder in oil which provides good water resistance and sebum resistance, a low aggregation tendency and an excellent dispersibility in various oils and is also to provide cosmetics comprising same to provide users with satisfaction Means to Solve the Problems A powder composition comprising silicone according to the following formula (1) and powder and/or a coloring agent, a dispersion of powder in oil in which the powder composition is dispersed, and the cosmetics comprising same, R<1>aR<2>bR<3>cSiO(4-a-b-c)/2 (1) wherein R<1 >may be same with or different from each other and is an organic group selected from the group consisting of C1-30 alkyl groups, aryl groups, aralkyl groups, fluorinated alkyl groups, amino-substituted alkyl groups, carboxyl substituted alkyl groups, or polyoxyalkylene groups, R<2 >is a polyglycerin derivative, and R<3 >is organosilicone.

The invention discloses an electrolyte additive, a high-voltage electrolyte and a lithium ion battery containing the electrolyte additive. The high-voltage electrolyte is prepared by adding the electrolyte additive into the conventional electrolyte; the conventional electrolyte comprises a non-aqueous organic solvent and lithium salt, wherein the content of the non-aqueous organic solvent is 80-85 percent of the total mass; the mass of the electrolyte additive is 0.01-10 percent of the total mass; and the electrolyte additive is maleic anhydride C4H2O3 or one of derivatives thereof and has the structure formula as shown in the abstract. According to the high-voltage electrolyte, a stable interfacial film can be formed on the surfaces of a positive electrode and a negative electrode, the reaction activity on the electrode surface is inhibited, oxidative decomposition of the electrolyte is reduced, and gas swelling is effectively inhibited, so that the safety performance and the cycle performance of the lithium ion battery under normal pressure and high voltage are improved and the service life of the lithium ion battery under normal pressure and high voltage is prolonged. The electrolyte is simple in preparation process and is suitable for industrial production.

The invention provides an electrolyte and a battery. The electrolyte includes an electrolyte salt and an organic solvent; the organic solvent includes cyclic carbonate and chain carbonate; the electrolyte also includes an additive A and an additive B; the additive A is a positive film forming additive, and the additive B is a negative film forming additive; the reduction potential of the additiveB is higher than that of the cyclic carbonate; and the conductivity of the electrolyte at 25 DEG C is 6 mS/cm - 10 mS/cm. The electrolyte can enhance the cycle performance and storage performance of the battery, especially enhance the cycle performance and storage performance of the battery under high temperature and high voltage, and the low temperature performance of the battery can also be considered.

The invention belongs to the technical field of the lithium ion battery, and discloses a high-voltage functional electrolyte and a preparation method and an application therefor. The high-voltage functional electrolyte is prepared by adding a functional additive into the common electrolyte, wherein the functional additive accounts for 0.25-5% of the common electrolyte based on mass percentage; and the structural formula of the functional additive is as shown in the formula (1). The functional additive which is diethyl (thiophene-2-methyl) phosphate can be used as the high-voltage film-forming agent and the flame-retardant additive of the lithium ion electrolyte; the electrolyte containing the functional additive is non-combustible; and the room-temperature and high-temperature cycling performances of the lithium ion battery prepared from the electrolyte are both improved under 3-5.0V, so that the high-voltage functional electrolyte is wide in the application prospect.

There are provided a portable press powder for latent fingerprints using natural minerals capable of taking latent fingerprints from a surface of a material object, the latent fingerprints being left when the material object is touched with a hand but invisible to the naked eye, and a method for preparing the same. The portable press powder for latent fingerprints according to the present invention can be useful to take clear fingerprints in more economical manner since it is safe to human body and the powder scattering is low when compared to the conventional blackish powders, and thus, it is environment-friendly, easy to take fingerprints and easy to handle a powder.

The invention belongs to the technical field of lithium ion battery materials, and discloses high-voltage electrolyte and a lithium ion battery containing the electrolyte. The high-voltage electrolyte is obtained by adding a functional additive to common electrolyte, wherein the mass of the functional additive is equivalent to 0.1-5% of that of common electrolyte, and the functional additive refers to an alkene dinitrile type compound. According to the high-voltage electrolyte and the lithium ion battery containing the electrolyte disclosed by the invention, the alkene dinitrile type compound containing nitrogen elements and double-bond functional groups is used as a high-voltage film forming additive of the lithium ion electrolyte, the additive is based on the oxidation or the reduction of double bonds, and a layer of compact passivating films can be formed on the surface of a positive pole and the surface of a negative pole in the process of first charge and discharge. Stable cyanogen bases are introduced, so that surface films are stabler in electrochemistry and chemistry. The cycle performance of the lithium ion battery containing the additive of the electrolyte under 3-4.5V is improved, the safety performance and the energy density of the lithium ion battery are improved, and the service life of the lithium ion battery is prolonged.

The invention relates to a grain refiner for magnesium alloy, belonging to the field of alloy materials, in particular to the application of Al2Ca in preparing a grain refiner of magnesium alloy. The invention also relates to a grain refined type magnesium alloy, which comprises the following components by weight percent: 2.35-14.1% of Al2Ca, less than or equal to 0.3% and the balance of Mg. The preparation method of the magnesium alloy is as follows: heating Mg and Mg-Ca alloy of formula ratio to complete melting under conditions of vacuumizing and introducing inert gas; evenly stirring; adding pure Al of formula ratio; insulating heat until Al and Ca react completely; and cooling to obtain magnesium alloy containing Al2Ca, namely the grain refined type magnesium alloy. With respect to the grain refined type magnesium alloy prepared according to the method, the cast-condition crystallite dimension is 40 mu m which is obviously lower than the crystallite dimension of magnesium alloy in which the grain refiner is not added under the same condition, wherein the crystallite dimension of magnesium alloy without adding the grain refiner is 110 mu m.

The invention discloses a method for preparing non-aqueous electrolyte suitable for high-energy density lithium ion batteries and relates to the technical field of electrochemistry. The preparation method comprises the following steps: (a) carrying out reduced pressure distillation, purification and lithiated molecular sieve dehydration on a 80-85wt% of organic solvent in the presence of nitrogen to obtain a refined non-aqueous organic solvent, wherein the purity of the non-aqueous organic solvent is greater than 99.99 and the water content is less than 10ppm; (b) adding 12-15wt% of lithium salt in the purified solvent to make the concentration be 1M and obtain basic electrolyte; (c) adding a 0.01-3wt% of additive A and a 0.1-6wt% of additive B into the electrolyte. The method has the advantages that thiophene, benzothiophene, 2-thiophene formonitrile and 2-methylthiophene are adopted as electrolyte additives, the electrolyte can be electrolyzed on the surface of an electrode to form a compact protective film, surface films of positive and negative electrodes are optimized and the surface activity of the electrodes is inhibited, so that the oxygenolysis of the electrolyte main solvent at high voltage is inhibited, the high voltage cycle performance of the lithium ion batteries is improved and the gas expansion phenomenon is reduced.

The invention provides an electrolyte and an electrochemical device. The electrolyte includes an additive A and an additive B; the mass percentage content of the additive A in the electrolyte is 0.001-10%, and the mass percentage content of the additive B in the electrolyte is 0.1-10%; The cycle performance and storage performance of the electrochemical device can be enhanced, especially the cycleperformance and storage performance of the electrochemical device under high temperature and high voltage can be increased.

The invention belongs to the field of a lithium ion battery material, and discloses an electrolyte additive and an electrolyte comprising the additive, and a lithium secondary battery. The electrolyteadditive is 4-methyl-N-tosyl benzene sulfonamide. A cyclic carbonate solvent and a linear carbonate solvent are mixed, and then are subjected to purification, impurity removal and dewatering, and a conductive lithium salt is added in the room temperature condition to obtain a common electrolyte; and next, an additive which accounts for 0.5-3.0% of the mass of the common electrolyte is added to the common electrolyte to obtain the final electrolyte. By taking 4-methyl-N-tosyl benzene sulfonamide as the additive of the lithium ion electrolyte, the cycle performance of the lithium secondary battery at a high pressure is improved.

The invention discloses a high-voltage electrolyte with a rapid charge function and a preparation method and application thereof, and belongs to the technical field of a lithium ion battery. The electrolyte is prepared by adding a functional additive in an amount equivalent to 1-5% of the mass of a conventional electrolyte into the conventional electrolyte, wherein the functional additive is difluoromethyl phenyl sulfone. The functional additive difluoromethyl phenyl sulfone can be used as a high-voltage and rapid-charge film formation additive; since the additive has relatively low oxidization potential, a compact and stable interface film can be formed on a surface of a positive electrode during the initial charge-discharge process, the surface membrane of the positive electrode is optimized, the surface activity of an electrode is prevented, so that further contact of the electrolyte and an electrode active substance and HF formation are prevented, and oxidization and decomposition of an electrolyte main solvent in the surface of the electrode are reduced; and the room-temperature cycle property and the rate performance of the lithium ion battery containing the functional additive are improved under 3-4.35V, and the lithium ion battery has favorable application prospect.

The invention provides an electrolyte additive, an electrolyte containing the same, a lithium ion battery and an apparatus. The liquid electrolyte additive comprises at least one of compounds represented by the formula (I) and formula (II). The additive of the present invention is capable of for a dense and stable SEI film layer on the positive and negative electrode surfaces in the first-time charge and discharge process, optimizes positive and negative electrode surface films, inhibits the surface activity of the electrodes, protects an electrode material, inhibits further contact between the electrolyte and electrode active material, reduces oxidative decomposition of an electrolyte main solvent on the electrode surfaces, and improves cycle performance of a lithium ion secondary batteryunder high voltage.

The invention discloses a bulk concentrate flotation separation method based on reinforcement of lead sulfide inhibition. Firstly, wet process pretreatment is conducted on the bulk concentrate, the inhibition to lead sulfide in the bulk concentrate is selectively reinforced, then sulfuric acid or a mixture of the sulfuric acid and manganese dioxide and a mixture of sulfuric acid and ammonium persulfate is added, filtration is performed after heating and stirring, filtrate can be recycled, a filter cake is washed till pH is close to the neutral, then water is added for size mixing, then terpenic oil is used as a foaming agent, and the flotation separation is performed by adopting the flotation process of rough flotation, fine flotation and re-flotation of middlings. The method based on theprocess of separating lead and other ingredients in vulcanized bulk concentrate has the advantages that the steps complement each other's advantages, agent preparation is simple, copper-lead or lead-zinc separation is thorough, the cost is low and the recovery rate is high, is applied to copper-lead, lead-zinc or copper-lead-zinc bulk concentrates, achieves economic and efficient copper-lead and lead-zinc separation of copper-lead or lead-zinc vulcanized bulk concentrates, remarkably improves the utilization rate of copper, lead and zinc resources and is good in effect.