5results about How to "Avoid white pollution" patented technology

This invention relates to a production process for biodegradable meltblown nonwoven fabric, comprising the following steps: S1, plasticizing and extruding PLA mixed raw materials at a temperature of 80-90℃, and plasticizing and extruding PBAT mixed raw materials at a temperature of 80-90℃; S2, selecting 75-80 parts by weight of PLA mixed raw materials, 25-30 parts by weight of PBAT mixed raw materials, 15-18 parts by weight of grafted material, and 3-5 parts by weight of electrostatic electret masterbatch; S3, uniformly dividing the grafted material into N parts, and feeding 1 / N of the grafted material, 75-80 parts by weight of PLA mixed raw materials, 25-30 parts by weight of PBAT mixed raw materials, and 3-5 parts by weight of electrostatic electret masterbatch into a third screw extruder to form intermediate raw materials; S4, extruding the melt mixture obtained in step S3 through a spinneret; S5, the meltblown fibers in step S4 are cooled by negative pressure suction molding and then enter the high-voltage electrostatic electret to carry charge. The present invention has the following advantages: it can achieve biodegradability, avoid white pollution, and at the same time ensure that the meltblown fabric produced has high filtration efficiency.

This utility model provides a recyclable, biodegradable, and environmentally friendly ink-absorbing needle-punched nonwoven fabric, relating to the field of nonwoven fabric technology. It includes: a nonwoven fabric body; the nonwoven fabric body has a three-layer composite structure, with an upper dense surface layer and a lower dense surface layer, and a middle loose support skeleton. Both the upper and lower dense surface layers are composed of fibers with a diameter of 2 micrometers. A nanofiber cellulose film with a thickness of 8 micrometers is laminated to the surface of the nonwoven fabric body. The nonwoven fabric body has a three-layer composite structure, with upper and lower polylactic acid dense layers (2 micrometers in diameter, each accounting for 20% of the total thickness) controlling ink diffusion and improving strength, and a middle loose support skeleton (6 micrometers in diameter, accounting for 60%, with a porosity of 75%) storing and penetrating ink. The three-dimensional structure is formed by needle punching at 200 needles / cm². The film contains 3% titanium dioxide for UV resistance. Both polylactic acid and nanofiber cellulose are biodegradable materials, suitable for printing, medical, and packaging fields, balancing environmental friendliness, printing performance, and functionality.

This utility model discloses a steam turbine start-up condensate recovery device, relating to the field of steam turbines. The device includes a saturated steam pipeline network and a steam turbine unit. A steam-water separator, an inlet tee pipe, and an outlet connecting pipe are installed between the saturated steam pipeline network and the steam turbine unit. One end of the inlet tee pipe is fixedly connected to a condensate tee pipe, and the other end is fixedly connected to the steam-water separator. One end of the outlet connecting pipe is fixedly connected to the steam-water separator, and the other end is fixedly connected to the saturated steam pipeline network. The outlet connecting pipe is used to guide superheated steam from the steam turbine unit into the saturated steam pipeline network for reuse. This device, by adding a pipeline and a stop valve before the existing condensate pipe to the drain valve, introduces steam energy into the saturated steam pipeline network, enabling the recovery of steam energy during turbine start-up, achieving energy conservation and emission reduction, avoiding environmental noise pollution and white pollution, and increasing the steam output of the saturated steam turbine unit.

This invention belongs to the field of polymer functional materials technology, specifically relating to a biodegradable light-converting film with intrinsic fluorescence and its applications. The biodegradable light-converting film is prepared from a biodegradable copolyester with aggregation-induced emission properties. The biodegradable copolyester is polymerized from a polymerizable monomer, a first monomer providing rigid conjugated units, and a second monomer providing flexible spacer units. In the main chain structure of the biodegradable copolyester, the longest linear spacer segment between any two adjacent rigid conjugated units derived from the first monomer has ≥10 carbon atoms. Through precise molecular structure design, the aggregation-induced emission properties are chemically bonded to the biodegradable polyester main chain, fundamentally solving the problems of easy migration, aggregation quenching, and high cost of the light-converting agent in traditional additive-type light-converting films. This light-converting film exhibits efficient and stable intrinsic fluorescence in the solid state, with tunable fluorescence color, and possesses good mechanical properties and biodegradability.

The invention discloses a forest-derived xylooligosaccharide-based edible preservative film and a preparation method thereof, and belongs to the technical field of food preservation. The preparation method comprises the following steps: mixing agar, gelatin, xylooligosaccharide and water, heating and stirring until the materials are dissolved, adding glycerol, and uniformly mixing to prepare a film forming solution; and defoaming, drying, refrigerating and forming the film forming liquid to obtain the forest-sourced xylooligosaccharide-based edible preservative film. The wood source waste hydrolysis extract xylooligosaccharide is adopted as the raw material, waste resource utilization is achieved, and compared with the current situation that an existing plastic preservative film depends on non-renewable petrochemical raw materials, the raw material cost is reduced, and resource waste is reduced; the environment-friendly plastic preservative film has the advantages that the plastic preservative film can be naturally degraded after being used, white pollution caused by plastic preservative film residues is avoided, and the environment-friendly trend is met, so that the environment-friendly plastic preservative film has remarkable environmental benefits.