In vitro antioxidant and antitumor activities of different sulfated polysaccharides isolated from three algae.

Rapid purification of polysaccharides using novel radial flow ion-exchange by response surface methodology from Ganoderma lucidum

Are axial and radial flow chromatography different

The invention relates to cutting fluid, in particular to semi-synthetic metal cutting fluid. The semi-synthetic metal cutting fluid is prepared by methyl levulinate, (R)-(+)-2,4-dyhydroxy-N-(3-hydroxypropyl)-3,3-dimethylbutyramide, 2-oxo-1,5-disoidum glutarate dihydrate, 4-piperidone-3-carboxylate hydrochloride and trimethylsilylketene. The semi-synthetic metal cutting fluid has good cooling, anticorrosion, antirust and lubricating performance, service life of a knife can be prolonged effectively, and excellent machining accuracy can be realized; the semi-synthetic metal cutting fluid can play a role in safely and reliably protecting and inhibiting corrosion of nonferrous metal like aluminum and steel and ferrous metal, so that time and cost for subsequent treatment can be omitted; the semi-synthetic metal cutting fluid is suitable for being widely popularized and applied in the field of the cutting fluid.

Semi-synthetic metal cutting fluid

The invention discloses a steel ring billet casting technique based on casting and rolling combined forming. The steel ring billet casting technique based on casting and rolling combined forming comprises the steps that firstly, a casting mold is manufactured by means of water glass sand, the casting mold is dried and sprayed with painting, casting raw materials of a steel ring are smelted and are poured into the casting mold, and normalizing, tempering and quenching-tempering heat treatment are conducted on a steel ring billet formed through pouring; secondly, the steel ring billet is cooled to the room temperature, and polishing and machining are conducted on the cooled steel ring billet; finally, the steel ring billet which can be directly used for casting and rolling combined forming is obtained. According to the steel ring billet cast according to the technique, the defects, such as shrinkage cavities, shrinkage porosity and segregation, appearing in the steel ring billet casting process can be reduced, grains are refined to the maximum extent, and the high-quality steel ring billet capable of meeting the requirement for the ring rolling performance is manufactured; due to the fact that the processes of the casting and rolling combined forming technique are simplified, the quality and performance of the ring rolling technique and a ring workpiece are guaranteed.

Steel ring billet casting technique based on casting and rolling combined forming

The invention relates to an alloy steel material for a mine crusher hammerhead, which contains the following chemical elements in percentage by mass: 0.60-0.80% of carbon, 0.9-1.20% of silicon, 1.3-1.5% of manganese, 2.50-2.80% of chromium, 3.30-3.50% of molybdenum, 0.15-0.20% of nickel, 0.70-0.90% of vanadium, 0.8-1.2% of Ti, 0.03-0.06% of Pd, 0.10-0.15% of In, at most 0.05% of S, at most 0.05% of P and the balance of iron. The medium-carbon steel gas favorable toughness and higher hardness; the material contains the molybdenum, Ti, In and many other alloy elements, and thus, has high wear resistance; and the material has the characteristics of high red hardness and small cold brittleness, has excellent properties in both high-temperature and low-temperature environments, and is suitable for small-size crushers, and the service life is 3 times longer than common low-alloy steel. When the refining agent is used for casting production, the yield is obviously enhanced.

Alloy steel material for mine crusher hammerhead and preparation method thereof

The invention relates to a high-chromium rare-earth alloy steel hammerhead material which contains the following chemical elements in percentage by mass: 2.7-2.9% of carbon, 1.2-1.5% of silicon, 5.4-5.8% of manganese, 8.7-9.1% of chromium, 2.0-2.3% of molybdenum, 1.2-1.5% of nickel, 0.02-0.05% of copper, 0.2-0.4% of aluminum, 0.09-0.12% of Nb, 0.03-0.05% of Sc, at most 0.05% of S, at most 0.05% of P and the balance of iron. By using high-carbon steel as the raw material and containing high chromium and trace amounts of Sc, Nb, aluminum and many other alloy elements, the material has the advantages of very high initial hardness, very high wear resistance, favorable corrosion resistance and favorable toughness; the material is suitable for working conditions with severe impact, and used for a large-size crusher hammerhead of which the feed particle size is higher than 400mm; and the service life of the material is enhanced by 1-2 times as compared with the traditional high-manganese steel. When the refining agent is used for casting production, the yield is obviously enhanced.

High-chromium rare-earth alloy steel hammerhead material and preparation method thereof

A scale-inhibiting antirust cutting fluid is prepared from the following raw materials in parts by weight: 20-23 parts of kerosene, 3-4 parts of tributyl citrate, 1-2 parts of alkenyl butanedioic acid, 1-2 parts of urea, 1-2 parts of acrylonitrile, 4-5 parts of polymaleic acid, 3-4 parts of glucuronide, 1-2 parts of sodium diacetate, 1-2 parts of diethanolamine, 1-2 parts of sodium dodecyl sulfate, 6-8 parts of an auxiliary agent and 200 parts of water. The cutting fluid provided by the invention not only has good lubricity and cleaning property, but also has excellent antirust and scale-inhibiting performances by utilizing polymaleic acid, sodium diacetate and diethanolamine; and the service life of the cutting fluid and machineries is prolonged.

Scale-inhibiting antirust cutting fluid and preparation method thereof

An environmental-friendly microemulsified cutting fluid is prepared from the following raw material: by weight, 2-3 parts of crosslinking agent TAIC (triallyl isocyanurate), 14-15 parts of epoxy flaxseed oil, 1-2 parts of benzotriazole, 1-2 parts of silver nitrate, 10-12 parts of rapeseed oil, 2-3 parts of oleic acid, 1-2 parts of barium dinonyl naphthalene sulfonate, 1-2 parts of sodium dodecyl benzene sulfonate, 3-5 parts of acetyl tri(2-ethyl hexyl) citrate, 6-8 parts of an additive and 200 parts of water; the environmental-friendly microemulsified cutting fluid does not contain mineral oil, phenol, formaldehyde, organic volatile matters, nitrites and other harmful substances, is less harmful to human body and the environment, and at the same time is good in lubricity, not easy to go bad and smell, stable in dispersion, non-layered, more than one year in use cycle, non-corrosive to metals, low in cost, and suitable for cutting, grinding, drilling, and other processes of various metals

Environmental-friendly microemulsified cutting fluid and preparation method thereof

The invention relates to a cutter alloy steel material for machining titanium alloy. The cutter alloy steel material consists of the following chemical elements by weight percent: 0.10 to 0.15 percent of carbon, 15 to 18 percent of cobalt, 2.1 to 2.5 percent of chromium, 0.2 to 0.5 percent of vanadium, 0.4 to 0.6 percent of niobium, 6.1 to 6.3 percent of molybdenum, 1.3 to 1.5 percent of tungsten, 0.02 to 0.04 percent of Sb, 0.9 to 1.2 percent of Bi, 0.05 to 0.08 percent of Yb, and the balance of iron and other unavoidable impurities. By adding the elements such as cobalt, molybdenum, niobium, vanadium, tungsten and the like to the alloy steel, the hardness, abrasion resistance and high temperature resistance of the alloy can be improved; by adding the elements such as Sb, chromium, Yb and the like, the hardness of the alloy can be greatly improved; the alloy steel is suitable for producing a special cutter which is used for cutting a material difficult to cut such as titanium alloy, and the special cutter is good in heat resistance, high in cutting precision and long in service life.

Wang Jingwen

Papers

Alloy steel material for mine crusher hammerhead and preparation method thereof

High-chromium rare-earth alloy steel hammerhead material and preparation method thereof

Scale-inhibiting antirust cutting fluid and preparation method thereof

Environmental-friendly microemulsified cutting fluid and preparation method thereof

Cutter alloy steel material for machining titanium alloy and preparation method thereof