Abstract: The present disclosure belongs to the technical field of PVC foam co-extruded sheets, and particularly relates to a wide low-temperature impact-resistant and bending-resistant PVC foam co-extruded sheet and a preparation method thereof. The PVC foam co-extruded sheet of the present disclosure includes a core layer and a skin layer. Raw materials of the core layer include PVC resin powder, a silicone-methyl methacrylate-ethyl acrylate composite low-temperature toughening and reinforcing agent, a filler, a foaming regulator I, a white foaming agent, a calcium-zinc stabilizer, a cold-resistant plasticizer, stearic acid, polyethylene wax, and oxidized polyethylene wax.

Abstract: The present invention relates to an ultra-high molecular weight polyethylene and a process for preparing the same, said ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 150-1000×104 g/mol, a metal element content of 0-50 ppm, a bulk density of 0.30-0.55 g/cm3, a true density of 0.900-0.940 g/cm3, a melting point of 140-152° C., and a crystallinity of 40-75%, and said polyethylene satisfies at least one of condition (1) and condition (2): Condition (1): tensile elasticity modulus is greater than 250 MPa, preferably greater than 280 MPa, more preferably greater than 300 MPa, Condition (2): Young's modulus is greater than 300 MPa, preferably greater than 350 MPa. The ultra-high molecular weight polyethylene has high mechanical properties, high melting point, low metal element content and ash content, and the preparation process is simple, flexible and adjustable, and the ultra-high molecular weight ethylene copolymer has a high tensile elasticity module.

Abstract: The present disclosure provides a method for preparing lithium iron phosphate from ferric hydroxyphosphate, including: purifying ferrous sulfate to form a ferrous sulfate solution, adding hydrogen peroxide, phosphoric acid, an ammonium dihydrogen phosphate solution and ammonia water into the ferrous sulfate solution and then reacting to form a mixed slurry, holding the mixed slurry at a temperature for a period of time, and then washing with water and subjecting to press filtration to form ferric hydroxyphosphate precursors with different iron-phosphorus ratios; then flash drying, sintering at a high temperature, and pulverizing to obtain ferric hydroxyphosphate precursors with different iron-phosphorus ratios and different specific surface areas.

Abstract: The present invention relates to an ethylene polymer and a process for preparing the same, wherein the ethylene polymer has an average particle size of 50-3000 ?m, a bulk density of 0.28-0.55 g/cm3, a true density of 0.930-0.980 g/cm3, a melt index at a load of 2.16 Kg at 190° C. of 0.01-2500 g/10 min, a crystallinity of 30-90%, a melting point of 105-147° C., a comonomer molar insertion rate of 0.01-5 mol %, a weight-average molecular weight of 2×104 g/mol-40×104 g/mol, and a molecular weight distribution of 1.8-10. In the preparation process, raw materials containing ethylene, hydrogen gas and a comonomer are subjected to a tank-type slurry polymerization with an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure of 20-150 KPa at 20° C. as the polymerization solvent in the presence of a polyethylene catalytic system, at the molar ratio of hydrogen gas to ethylene of 0.01-20:1, preferably 0.

Abstract: The present invention relates to a process for continuously producing an ultra-high molecular weight polyethylene by the ethylene slurry polymerization, wherein raw materials containing ethylene and optionally at least one comonomer are subjected to a continuous slurry polymerization in a hydrogen free atmosphere in the ethylene slurry polymerization condition by using 2-6 ethylene slurry polymerization reaction tanks connected in series, and the deviations of the polymerization temperatures, the polymerization pressures, and the gas phase compositions between the tanks each other are controlled to certain ranges. The ultra-high molecular weight polyethylene having the viscosity-average molecular weight of 150-800×104 g/mol can be continuously produced. This process has flexible polymerization manner, large room for adjusting and controlling, and stable polymer performance.

Abstract: The present disclosure belongs to the technical field of PVC foam co-extruded sheets, and particularly relates to a wide low-temperature impact-resistant and bending-resistant PVC foam co-extruded sheet and a preparation method thereof. The PVC foam co-extruded sheet of the present disclosure includes a core layer and a skin layer. Raw materials of the core layer include PVC resin powder, a silicon-acrylic composite low-temperature toughening and reinforcing agent, a filler, a foaming regulator I, a white foaming agent, a calcium-zinc stabilizer, a cold-resistant plasticizer, stearic acid, polyethylene wax, and oxidized polyethylene wax.

Abstract: Disclosed are biomarkers and a prediction method for predicting age in days in pigs. The biomarkers for predicting age in days of pigs include one or more CpG sites with different methylation levels, and the different methylation levels of the CpG sites correspond to different ages in days of pigs. An Elastic Net linear regression model is constructed by using the methylation levels of the CpG sites and the weights corresponding to each CpG site, thereby predicting age in days of pigs to be tested. The above prediction method has high accuracy, and is accurate and reliable in detecting age in days of pigs, which fills the gap in the age prediction model of pigs based on DNA methylation, and provides an ideal model for investigating important scientific issues such as development and aging of human and animals.

Abstract: Disclosed is an angle adjusting device for portable LED light, which includes two symmetrical outer housings of LED light, rotatable shafts fixed to the outer housings, two symmetrical handles, outer gears fixed on an end of the rotatable shafts, and bases. The handle is rotatably connected with the outer housing via the rotatable shafts; two pairs of guide rods are fixed on the handle; the base has an upper guide hole and a lower guide hole formed thereon; the guide rod is sleeved with a compression spring located into the upper guide hole, the base being capable of sliding up and down along the guide rod; and the base has a cavity formed at center thereof for accommodating the outer gear, a gear tooth being provided in the cavity for fitting the outer gear. It has simple structure and the angle between the two outer housings could be adjusted freely.

Abstract: Disclosed is an angle adjusting device for portable LED light, which includes two symmetrical outer housings of LED light, rotatable shafts fixed to the outer housings, two symmetrical handles, outer gears fixed on an end of the rotatable shafts, and bases. The handle is rotatably connected with the outer housing via the rotatable shafts; two pairs of guide rods are fixed on the handle; the base has an upper guide hole and a lower guide hole formed thereon; the guide rod is sleeved with a compression spring located into the upper guide hole, the base being capable of sliding up and down along the guide rod; and the base has a cavity formed at center thereof for accommodating the outer gear, a gear tooth being provided in the cavity for fitting the outer gear. It has simple structure and the angle between the two outer housings could be adjusted freely.