34results about How to "Transparency impact" patented technology

The invention relates to the field of biological antibacterial hydrogel materials, in particular to an injectable natural triterpenoid antibacterial hydrogel and a preparation method thereof. The mixture of hydrogel glycyrrhizic acid and pentacyclic triterpenoid compound or tetracyclic triterpenoid compound disclosed in the present invention is a gel molecule, and phosphate buffered saline (PBS) is used as a gel solvent, and the non-co-coated structure formed between the mixtures is utilized. The valence bond force is prepared through the self-assembly mechanism of small molecules. The prepared hydrogel can exhibit antibacterial properties without adding antibacterial drugs, and the mechanical properties of the hydrogel are significantly improved. The preparation method of the hydrogel of the invention is simple, not only can simplify the preparation process of the injectable antibacterial hydrogel, but also expand the application field of the triterpenoids. It can be made into a new type of antibacterial material with biomedical application properties and mechanical strength.

The invention belongs to the polyester spinning field and relates to an 8-shaped hollow polyester fiber FDY (Fully Drawn Yarn) and a preparation method thereof. A spinning melt contains saturated fatty acid metal salt and modified polyester, wherein the mass ratio of saturated fatty acid metal salt to modified polyester is (0.0005-0.002) to 1; saturated fatty acid metal salt is fatty acid metal salt, the carbon atomic number is 12-22, the melting point is 100-180 DEG C, and the kinetic viscosity is less than or equal to 1Pa.s; a molecular chain of modified polyester comprises a terephthalic acid chain segment, a glycol chain segment and a rigid structure chain segment, and the molar ratio of the rigid structure chain segment to the terephthalic acid chain segment is (0.02-0.05) to 1; and the die swell ratio of the spinning melt is 1.23-1.33, and the after-filtration pressure during the spinning is 85-125kg / cm<2>. The prepared 8-shaped hollow polyester fiber FDY has relatively high degree of hollowness and relatively good shape-preserving effect.

The invention discloses surface modified nano-cerium oxide as well as a preparation method and use thereof. The invention further provides a polypropylene composition containing the modified nano-cerium oxide and polypropylene and a polypropylene film which are prepared from the composition. The surface modified nano-cerium oxide is prepared by the steps of reacting by virtue of large-particle cerium oxide and a surface modifier in a high-temperature and high-pressure microcell generated by laser bombardment so as to reduce the size of cerium oxide to a nano scale, and grafting the surface with the surface modifier. The surface modified nano-cerium oxide has the beneficial effects that on one hand, cerium oxide can be effectively subjected to surface treatment; on the other hand, nano-scale cerium oxide can be prepared from micron-scale cerium oxide, so that the material cost is saved; and furthermore, a columned cerium oxide solid target can continuously sink into a flow liquid phase, so that the preparation method has the advantage that the continuous operation is realized.

The invention relates to a flat polyester fiber FDY (Fully Drawn Yarn) and a preparation method thereof. The spinning melt comprises a saturated fatty acid metal salt and polyester, wherein a mass ratio of the saturated fatty acid metal salt to polyester is (0.0005-0.002):1; the filtered pressure during spinning is 84-126kg / cm<2>; a die-swell ratio of the spinning melt is 1.22-1.34; and the saturated fatty acid metal salt refers to a fatty acid metal salt with the carbon atom number of 12-22, the melting point of 100-180 DEG C and the dynamic viscosity of less than or equal to 1Pa.s. The saturated fatty acid metal salt is added into the spinning melt, and the filtered pressure and extrudate swelling during spinning can be effectively reduced, so that the product has an excellent shape preserving effect; meanwhile, the saturated fatty acid metal salt can serve as a nucleating agent, so that the fiber curing speed is increased, and the fiber shape preserving effect is improved. In addition, the fiber structure regularity is not greatly damaged by the saturated fatty acid metal salt, and excellent performances of the polyester fibers are maintained.

The invention relates to a polyester spinning method capable of reducing extrusion swelling ratio. A spinning melt comprises a saturated fatty acid metal salt and modified polyester according to a mass ratio of (0.0005 to 0.002) to 1; the extrusion swelling ratio of the spinning melt is 1.20 to 1.32; the saturated fatty acid metal salt is a fatty acid metal salt with carbon atom number of 12 to 22, melting point of 100 to 180 DEG C, and dynamic viscosity less than or equal to 1Pa.s. The polyester spinning method has the advantages that by adding the saturated fatty acid metal salt into the spinning melt, which is equivalent to adding a lubricant, the post-filtering pressure during spinning is reduced, the exit swelling is effectively reduced, and a product has good shape preserving effect; the saturated fatty acid metal salt can be used as a nucleating agent, so that the curing speed of fibers is accelerated, and the shape preserving effect of the fibers is further improved; the saturated fatty acid metal salt has no great damage to the regularity of the polyester fiber structure, and the self excellence property of the polyester fiber is maintained.

The invention provides a composite flame retardant for paint. The composite flame retardant for the paint is characterized by comprising the components in parts by weight: 5-15 parts of resorcinol bi(diphenyl phosphate) (RDP), 10-25 parts of triethyl phosphate (TEP), 15-30 parts of phosphate tri(beta-chloroethyl) ester (TCEP) and 30-50 parts of phosphate tri(2-chloropropyl) ester (TCPP). The composite flame retardant is added into various common paint according to the ratio of 10-15%, so that the composite flame retardant has inflame-retarding and fireproofing functions under the premise that original color, transparency, adhesive force and resistant fastness are not affected; and the preparation process is simple, and the production cost is low.

A refrigerator of the present invention comprises: a first tray for forming a part of an ice-making cell; a second tray for forming another part of the ice-making cell; a tray temperature sensor for detecting a temperature of the ice-making cell; an electric discharge spark generator located around any one of the first tray and the second tray and provided with an electrode; and a controller for controlling the electric discharge spark generator to generate a spark in the electrode when water in the ice-making cell is determined to be in an overcooling state on the basis of the temperature measured by the tray temperature sensor.

The invention provides a transparent flame-retardant PVA film and a preparation method thereof, wherein the transparent flame-retardant PVA film has good transparency and good mechanical property under the premise of the ensuring of the flame retardancy of the PVA film. The preparation method comprises: (1) spinning at an electric-conduction substrate by using a mixed aqueous solution of PVA and methyl propionic acid phosphinic acid or a mixed aqueous solution of PVA, methyl propionic acid phosphinic acid and aluminum hypophosphite nanoparticles as a spinning liquid, arranging the spinning fibers into a network along an X-Y axis plane by using the surface of the electric-conduction substrate as the X-Y axis plane, and carrying out curing cross-linking within a range of 80-100 DEG C to obtain nano-fibers arranged on the surface of the electric-conduction substrate; and (2) casting the electric-conduction substrate prepared in the step (1) and covered with the nano-fibers by using a mixed aqueous solution of PVA and methyl propionic acid phosphinic acid as a casting liquid, and carrying out casting film forming to obtain the transparent flame-retardant PVA film.

The invention belongs to the field of polyester spinning, and relates to a multilobal hollow polyester fiber FDY (fully drawn yarn) and a preparation method thereof. A spinning melt comprises a saturated fatty acid metal salt and modified polyester according to a mass ratio of (0.0005 to 0.002) to 1; the saturated fatty acid metal salt is a fatty acid metal salt with carbon atom number of 12 to 22, melting point of 100 to 180 DEG C, and dynamic viscosity less than or equal to 1Pa.s; a molecular chain of the modified polyester comprises a terephthalic acid chain segment, an ethylene glycol chain segment and a rigid structure chain segment, the molar ratio of the rigid structure chain segment to the terephthalic acid chain segment is (0.02 to 0.05) to 1, the extrusion swelling ratio of the spinning melt is 1.20 to 1.31, and the post-filtering pressure is 80 to 120kg / cm<2> during spinning. The prepared multilobal hollow polyester fiber FDY has higher hollow degree and a better shape preserving effect.

The invention belongs to the field of polyester spinning, and relates to a square hollow polyester fiber FDY (Fully Drawn Yarn) and a preparation method thereof. A spinning melt contains a saturated fatty acid metal salt and modified polyester; the mass ratio of the saturated fatty acid metal salt to the modified polyester is (0.0005-0.002):1; the saturated fatty acid metal salt is a fatty acid metal salt of which the carbon atom number is 12-22, the melting point is 100-180 DEG C and the power viscosity is less than or equal to 1Pa*s; the molecular chain of the modified polyester comprises a terephthalic acid chain segment, a glycol chain segment and a rigid structure chain segment; the mole ratio of the rigid structure chain segment to the terephthalic acid chain segment is (0.02-0.05):1; the die swell ratio of the spinning melt is 1.21-1.32; the after-filtration pressure of the spinning melt in spinning is 82-123kg / cm<2>. The square hollow polyester fiber FDY provided by the invention is relatively high in hollowness degree and relatively good in conformal effect.

The invention discloses a water-based high-solid antistatic coating and a preparation method thereof. The coating comprises the following raw materials: hydroxyl polyurethane resin, conductive filler, functional powder, a functional additive, a coalescing agent, a pH modifier and the balance of water; the functional powder comprises carboxyl polyester resin with the acid value greater than 100, carboxyl polyester resin with the acid value of 25 to 100, and carboxyl polyester resin with the acid value smaller than 25, wherein the weight ratio of the three kinds of carboxyl polyester resin is (1-2):(1-2):(1-2). The water-based high-solid antistatic coating is characterized in that hydroxyl polyurethane water-base resin, water-based conductive filler and carboxyl polyester resin powder different in acid value gradient are compounded into a whole through cross-linking reaction, so that a compact film can be formed. The film formed by the coating has high solid content and good antistatic performance, has good chemical resistance, water resistance and excellent physical properties at the same time, and can be applied to the field of packaging and electromagnetic shielding of electronic products, furniture and the like.

The invention discloses a highly transparent modified polyolefin material and a preparation method thereof, which comprises 65-85 parts of poly-4-methyl-1-pentene, 7-15 parts of polyisobutylene, 3-10 parts of ethylene-propylene rubber, Prepared by 0.1 part of vulcanizing agent, 0.2 part of butylated hydroxytoluene, 5-10 parts of basic magnesium carbonate, 0.5 part of antioxidant and 0.2 part of dispersant. The highly transparent modified polyolefin material provided by the present invention selects poly-4-methyl-1-pentene, a crystalline material with excellent light transmission effect, as the base material, which ensures the dimensional stability of the material at relatively high temperatures; Molecular weight polyisobutylene and slightly cross-linked low molecular weight EPDM rubber are used as tougheners, and basic magnesium carbonate with special optical refractive index is used as filler material, which not only improves the toughness and rigidity of the material, but also avoids Effect on the overall transparency of the material.