7results about How to "Suitable viscosity" patented technology

The present application relates to a kind of high stability water-in-oil PDRN emulsion and its preparation method, belong to the field of biotechnology;The preparation method includes the following steps: (1) PDRN enzymolysis: PDRN is added in DNaseI, supplement metal ion activates enzyme, when fragment enrichment shows <800bp, terminate enzymolysis reaction, obtain crude enzymolysis solution;(2) moderate molecular weight screening: pressurized ultrafiltration crude enzymolysis solution with ultrafiltration membrane, and screen out the target fragment of the permeate of molecular weight in 120-500bp;(3) water phase system optimization: 1,3-propanediol and ubiquinol are added in the permeate;(4) semi-continuous feeding gradient emulsification.The present application is by precise control PDRN molecular weight to take into account stability and solubility, optimize water phase component to realize system viscosity and transparency double standard, cooperate gradient emulsification to guarantee water-in-oil system stability, significantly improve product comprehensive quality and application value, with outstanding technical advantages.

This invention discloses a polyimide resin solution, its preparation method, and its application in perovskite solar cells. The polyimide resin solution is prepared by mixing a mixture of fluorinated aromatic diamines and rigid aromatic diamines, and a mixture of fluorinated aromatic tetracarboxylic dianhydrides and rigid aromatic tetracarboxylic dianhydrides as raw materials. In the mixture of fluorinated aromatic diamines and rigid aromatic diamines, the molar ratio of the fluorinated aromatic diamines to the rigid aromatic diamines is 10–50:90–50; in the mixture of fluorinated aromatic tetracarboxylic dianhydrides and rigid aromatic tetracarboxylic dianhydrides, the molar ratio of the fluorinated aromatic tetracarboxylic dianhydrides to the rigid aromatic tetracarboxylic dianhydrides is 100–80:0–20. A polyimide resin solution is coated onto the back surface of a perovskite solar cell device to form a coating with a cutoff transmission wavelength of 380–420 nm and a transmittance of over 80% in the visible light band of 450 nm and above. This coating not only provides resistance to ultraviolet radiation but also facilitates the conversion of solar energy into electrical energy, thus balancing the high efficiency and stability of the battery. Furthermore, the manufacturing process is simple and efficient.

This invention discloses a highly efficient degassing refining agent for magnesium alloy ingots and its preparation method in the field of molten metal purification. The refining agent is composed of lanthanum fluoride-supported titanium carbide nanocomposite, calcium zirconate and graphene oxide nanohybrid, and various components such as anhydrous magnesium chloride, anhydrous sodium fluoride, anhydrous potassium chloride, metallic calcium powder, barium carbonate, and alumina micro powder in a specific ratio. Its preparation mainly includes: first, dispersing titanium carbide nanoparticles and reacting them with a lanthanum fluoride-containing solution, followed by hydrothermal treatment and calcination to obtain the lanthanum fluoride-supported titanium carbide nanocomposite; second, mixing a zirconium calcium salt solution with a graphene oxide dispersion, followed by urea co-precipitation, hydrothermal reaction, and calcination under a protective atmosphere to obtain the calcium zirconate and graphene oxide nanohybrid. This invention, through the synergistic effect of two inorganic modifying compounds, can deeply remove hydrogen and inclusions from magnesium melt, thereby significantly improving the metallurgical quality and overall performance of magnesium alloy ingots.

The present application provides a kind of based on acrylic polymer stabilizing system milk white essence and its preparation method, simultaneously as emulsifying agent and thickening agent, the acrylic acid ester class / C10-30 alkyl alcohol acrylic ester crosslinking polymer (Pemulen TR-1) in prior art is used as formula auxiliary component, constructs a formula framework extremely simple, and can realize long-term physical and chemical stable milk white essence system, improves the mildness and reliability of formula from the source. By using single, safe, light synthetic oil (caprylic / capric triglyceride) as the only oil phase component, while ensuring the necessary lubricating feeling and active substance dissolving carrier, the system is extremely simple, stable and controllable. Create a mild physical and chemical environment, maximize the protection and maintenance of recombinant collagen and other sensitive bioactive ingredients in the shelf life of chemical integrity and biological efficacy.

The application discloses a glass fiber reinforced polypropylene material, a preparation method and application, and belongs to the technical field of polypropylene engineering plastics. The material contains, in terms of weight parts, 40-70 parts of polypropylene resin, 20-50 parts of alkali-free continuous long glass fiber, and compounded antioxidants, compatibilizers, scratch-resistant agents, heat-resistant agents and light stabilizers. The alkali-free continuous long glass fiber has a diameter of 10-14 microns, a breaking strength of greater than or equal to 3000 MPa, and a linear density of 2400 tex or 3600 tex. The material has high strength, aging resistance and low-temperature impact resistance, and is suitable for automobile structural parts.

The invention relates to the technical field of separation and extraction of natural products, in particular to a method for supercritical separation and extraction of astaxanthin, which comprises the following steps: (1) weighing raw material components in parts by weight; (2) mixing a biomass raw material rich in astaxanthin with the functionalized deep-eutectic solvent, and performing physical field enhanced extraction to obtain an extracting solution; (3) filtering the extracting solution through a vibrating membrane, and purifying to obtain a trapped fluid containing astaxanthin; and (4) carrying out supercritical CO2 back extraction on the trapped fluid, separating to obtain an astaxanthin product, and recovering the functional eutectic solvent. According to the method, continuous membrane separation and purification under the eutectic solvent system are realized, the purity of astaxanthin and the proportion of all-trans astaxanthin are maintained while the extraction rate of astaxanthin is increased, the solvent can be recycled after being recovered, and the production cost and waste liquid discharge are greatly reduced. All the raw materials are nontoxic and harmless, no organic solvent is used in the technological process, and good application prospects are achieved.

Liquid polybutadiene, and a preparation method therefor and an application thereof. The liquid polybutadiene has a number-average molecular weight of 2,500-5,500, and a molecular weight distribution index of 1-1.2; based on the total amount of the liquid polybutadiene, the content of a 1,2-structural unit in the liquid polybutadiene is 85-95 wt%, the content of a 1,4-structural unit in the liquid polybutadiene is 5-15 wt%, and the molar ratio of a cis-1,4-structural unit to a trans-1,4-structural unit in the liquid polybutadiene is 1-2 : 1; and the dynamic viscosity of the liquid polybutadiene at 45°C is 100-500P. The liquid polybutadiene has good flowability, good film formability, and good coating performance, and a formed coating has an improved adhesion force to a substrate.