43results about How to "Great improvement in brittleness" patented technology

The invention belongs to the field of polymer electrolyte materials of lithium ion batteries, and particularly relates to a hyperbranched bifunctional star-shaped compound, a polymer electrolyte material, preparation of the hyperbranched bifunctional star-shaped compound and the polymer electrolyte material, and application of the hyperbranched bifunctional star-shaped compound. The hyperbranchedbifunctional star-shaped compound is a star-shaped compound with a branched chain extending outwards, and is prepared by subjecting polymercaptopropionate serving as a core and polyethylene glycol methacrylate serving as an arm to photocuring under ultraviolet light to initiate a mercapto-double bond reaction. The hyperbranched bifunctional star compound can be used as a lithium ion polymer electrolyte additive, can improve the ionic conductivity of an electrolyte material and can also be used as a plasticizer to improve the mechanical properties and flexibility of the electrolyte material, and the preparation process of the compound is simple to operate and friendly to environment. The invention also provides the polymer electrolyte material containing the hyperbranched bifunctional star-shaped compound. Thus, a new research thought and method are provided for preparing high-performance lithium ion polymer electrolytes.

The invention discloses high-density wear-resistant PPS plastic and a preparation method thereof. The high-density wear-resistant PPS plastic is prepared from, by weight, 100 parts of polyphenylene sulfide, 30-35 parts of metal powder, 8-10 parts of a mineral powder composition, 5-10 parts of a flexibilizer, 1-3 parts of a lubricant and 10-15 parts of a coupling agent. The preparation method comprises the following steps of: firstly, using a coupling agent to carry out surface modification on metal powder and a mineral powder composition, and mixing to obtain a heavy filler; secondly, adding polyphenylene sulfide, a flexibilizer, a lubricant and a heavy filler into a mixing smelting machine, and uniformly mixing to obtain a molten mixture; and thirdly, discharging the molten mixture from the mixing smelting machine, feeding the molten mixture into a double-screw extruder for further mixing and extrusion, and then pelletizing, cooling and packaging to obtain the high-density wear-resistant PPS plastic. The problem that a product is cheap and poor in wear resistance and the surface of the product is easy to wear due to low density and low weight of PPS plastic is solved.

The invention provides a wear-resistant and corrosion-resistant spray coating on the overflow surface of a valve and a preparation method thereof. The spray coating includes the following components: powder, adhesive and dispersant, and the composition of powder, adhesive and dispersant The weight ratio is 100:2-5:2-4; the powder includes the following components in weight percentage: 10-30% of nickel powder, 5-15% of chromium powder, and the balance is composite solid solution powder. The invention also provides a preparation method of the sprayed layer. The process flow of the invention is simple, adding materials or elements with excellent properties to the spray coating material, improving its composition content, making the spray coating structure and particle size distribution uniform, and better fluidity, effectively solving the problem of high brittleness and shedding tendency of the spray coating material Large size, insufficient wear and corrosion resistance and short service life.

The invention discloses a high-temperature-resistant self-crosslinking water-based epoxy resin for oil well cement. The preparation method steps are as follows: (1) dissolving the epoxy resin in N,N-dimethylformamide, feeding in nitrogen, and stirring Heat up to 85°C; (2) Dissolve benzoyl peroxide in acetone, then add the acetone solution dropwise to the solution in step (1), raise the temperature to 95°C, and keep the temperature constant for 30 minutes; (3) Add to the reaction solution Slowly add a mixed aqueous solution of 2-acrylamido-2-methylpropanesulfonic acid and acrylamide; constant temperature reaction for 4h; (4) rotary evaporation to remove solvent, use ethyl acetate to repeatedly wash to remove unreacted epoxy resin raw material, to obtain Self-crosslinking waterborne epoxy resin. The self-crosslinking water-based epoxy resin of the invention is added to the cement to simplify the on-site slurry mixing step; it can improve the brittleness characteristics of the oil well cement stone, and effectively improve the macroscopic mechanical properties and compactness of the oil well cement stone.

The invention discloses a bone substitute material, which comprises the following components in parts by weight: 1 part of ginsenoside sodium alginate microspheres and 90-110 parts of strontium-doped calcium sulfate hemihydrate loaded with silver nanoparticles; the ginsenoside alginate In the sodium microspheres, the mass ratio of ginsenoside to sodium alginate is: ginsenoside: sodium alginate = 1:4000-12000. The invention loads ginsenosides into the natural polymer alginic acid microspheres, which can promote the proliferation, migration and osteogenic differentiation of human bone marrow stromal cells. At the same time, sodium alginate microspheres are introduced into calcium sulfate hemihydrate containing strontium, which improves The strontium calcium sulfate hemihydrate material has the problems of high brittleness and sudden release. The prepared bone substitute material is a composite artificial bone material with certain mechanical properties and drug sustained release; nano-silver is added to the bone repair material, which can reduce the Risk of inflammation due to bone infection from surgery or trauma.

The invention relates to a polyolefin double-resistance material modified by carbon nanotubes, a preparation method and application thereof. The polyolefin double resistance material, the raw material is composed of the following raw materials in parts by mass: 60-92 parts of polyolefin matrix, 2-5 parts of carbon nanotubes, 0.5-4 parts of synergistic conductive agent, 0.3-4 parts of carbon nanotube dispersant 2 parts, 4-20 parts of flame retardant, 2-8 parts of polyolefin elastomer grafted with maleic anhydride and polysiloxane bifunctionality, 0.2-1.2 parts of antioxidant. The problem of difficult dispersion of carbon nanotubes in polymers is solved. The carbon nanotube-modified polyolefin double-resistant material has excellent antistatic properties, flame retardancy, and good mechanical properties; the tubes prepared therefrom have smooth surfaces, excellent comprehensive performance, strong pressure resistance, and are flame-retardant The antistatic performance meets the standard requirements of mining pipelines.

The invention provides a bismuth-based alloy solder paste composition, which comprises solder flux and tin alloy powder, and the weight ratio of the solder flux to tin alloy powder is 9%-15%. The inventor added a protective agent to the soldering paste, which can form a protective film to prevent the precipitation of small molecules. During the soldering process, high temperature leaves holes to absorb small molecules, so as to avoid harm to the human body and the environment. The solder paste prepared by the invention is environmentally friendly, has excellent performance, strong oxidation resistance, is lead-free, and has excellent expansion performance and soldering performance.

The invention relates to a basalt fiber reinforced regenerated micropowder geopolymer and a preparation method thereof, which comprises 100-500 parts of regenerated micropowder, 500-900 parts of metakaolin, 700-1000 parts of alkali activator, and 5-10 parts of high-efficiency activator , 3~18 parts of basalt fiber, 1~5 parts of fiber dispersant, 150~200 parts of deionized water. The present invention uses building solid waste to replace cement, which improves the recycling rate of resources, reduces the burden on the environment, reduces costs, and reduces resource consumption; the present invention uses basalt fiber to reinforce regenerated micro-powder geopolymers to solve the problem of poor toughness of geopolymers, The problem of large early shrinkage and easy cracking can be obtained by obtaining geopolymers with high strength and high toughness, which is conducive to the popularization and application of geopolymers in the field of engineering in my country.