8results about How to "Improve plasticizing effect" patented technology

The invention relates to a biodegradable polyester material as well as a preparation method and application thereof, and belongs to the technical field of compositions of high-molecular compounds. The biodegradable polyester material disclosed by the invention is prepared from the following components in parts by weight: 40 to 60 parts of biodegradable polyester, 30 to 45 parts of starch stearate, 5 to 15 parts of a plasticizer, 0.2 to 1.5 parts of an anhydride compound, 0.5 to 1.5 parts of an anti-hydrolysis agent and 0 to 2 parts of a processing aid, the biodegradable polyester is prepared from PBAT resin; the molar ratio of the structural units derived from terephthalic acid is greater than or equal to 49% based on the total molar weight of the structural units derived from terephthalic acid and adipic acid in the PBAT resin. The biodegradable polyester material has good mechanical properties and excellent damp-heat aging resistance.

This invention discloses a screw element for stretch-based reinforced compounding and an extrusion system for a screw extruder. The screw element includes a sleeve with a bottom groove having an outer wall surface twisted by 180° to form a torsional plane. Adjacent bottom grooves have raised ribs, the helical direction of which is consistent with the bottom groove. The height of the raised ribs increases and then decreases helically along the axis of the sleeve, while the width of the raised ribs also increases and then decreases helically along the axis of the sleeve, causing the width of the bottom grooves to decrease and then increase helically. Furthermore, the change in the width of the raised ribs is positively correlated with the change in their height. This invention features unique bottom grooves and raised ribs; the channels formed by the bottom grooves and raised ribs provide stronger stretching action, and the stretching flow field is uniformly distributed in all directions, resulting in superior melting and plasticizing effects on materials.

This utility model relates to the field of extruder screw technology and discloses a screw-separated double-barrier pin-type mixing structure, including a screw with screw ribs on its surface. The front section of the screw is configured as a feeding section, and the middle section of the screw ribs includes a main screw rib and a secondary screw rib. This utility model, through the separation-type double-screw rib design composed of the main and secondary screw ribs, allows the material to be fully tumbled to the B section after being heated and compressed in the A section. This process creates an effective separation effect, enhancing the plasticizing effect of the material and ensuring the uniformity of the molten material. By evenly arranging pins around the bottom diameter of the screw ribs, the material can be effectively stirred and mixed, further improving the mixing effect, especially when dealing with high-viscosity materials, improving the uniformity of mixing and ensuring the consistency of the final product quality.

This invention proposes a screw barrel accessory for high-speed, high- and low-pressure blown film extrusion equipment, applicable to blown film extruders. The screw includes a feed end and a discharge end at its two ends. Along the axial direction from the feed end to the discharge end, the screw sequentially features equal-depth screw groove sections, wavy gradient screw groove sections, a diamond sorting area, another wavy screw groove section, and a four-in, four-out multi-channel structure. This invention optimizes material plasticization, dispersion, flowability, and pressure control through a combination of wavy screw grooves, a dense tooth structure, a diamond sorting area, and a through-hole structure. The wavy and gradient screw grooves utilize a special structure to perform multiple shearing and kneading operations on the material. Simultaneously, the orderly arrangement of functional sections and the reasonable axial segment dimensions ensure smooth and stable screw operation, making it suitable for long-term continuous operation in high-speed, high- and low-pressure blown film production lines. This reduces the defect rate, improves overall production efficiency and economic benefits, and the integrated structural design enhances the overall strength of the screw.

The utility model provides a pipe extrusion screw which solves the problem that an existing screw structure is not ideal in mixing and plasticizing effect. The first plasticizing section is arranged at the discharging end of the feeding section; the second plasticizing section is arranged between the first plasticizing section and the homogenizing section, and the second plasticizing section is longer than the first plasticizing section; the auxiliary screw flights are arranged on the second plasticizing section, the height of the main screw flights is larger than that of the auxiliary screw flights, the distances between the auxiliary screw flights and the front and back adjacent main screw flights form a main screw groove and an auxiliary screw groove respectively, the depth of the main screw grooves is gradually shallower in the feeding direction, and the depth of the auxiliary screw grooves is gradually deeper in the feeding direction. A mixed material enters the first plasticizing section through the feeding section to be preliminarily plasticized and then enters the second plasticizing section, part of the unplasticized mixed material is located in the main spiral groove, and the mixed material is completely plasticized along with the fact that the depth of the main spiral groove is gradually shallower in the feeding direction and the shearing force is gradually increased. And the plasticized mixed material is changed into a melt, and the melt flows into the auxiliary screw groove from the top of the auxiliary screw flight.

The invention provides polyimide for gas separation and a manufacturing method and application thereof, and relates to the technical field of high polymer materials, the polyimide comprises the following components by mass: 80%-99.5% of fluorine-containing polyimide, 0.5%-20% of polyimide containing unsaturated end groups and 0.05%-5% of a catalyst; according to the invention, fluorine-containing polyimide is compounded with unsaturated terminal group-containing polyimide with a specific structure and a catalyst, so that a novel polyimide material which can be processed in a solution and can be thermally crosslinked under a mild condition is successfully developed. The material keeps the inherent high heat resistance and mechanical properties of polyimide, and more importantly, the carbon dioxide plasticizing resistance is remarkably improved while good gas permeability is kept through molecular design. In addition, after being prepared into a gas separation membrane, the gas separation membrane shows excellent selective stability for a long time or in a high-pressure carbon dioxide environment.

The application provides a biodegradable composition and a preparation method and application thereof, the biodegradable composition comprises 59-94 parts of biodegradable polyester, 1-6 parts of polylactic acid, 5-35 parts of starch and 1-10 parts of plasticizer in terms of weight parts; the D90 value of the starch after being dispersed with ethanol as a solvent is recorded as D1, the D90 value of the starch after being dispersed with a 30% ethanol aqueous solution as a solvent is recorded as D2, and 1.0<=D1 / D2<=1.8. In the application, the biodegradable composition has good puncture resistance and lifting performance, and the durability of the film is improved.

This invention discloses a pressure-matched polymer plasticizing and pressure-holding molding screw. Based on a conventional screw, two pressure-matching valve sections, a pressure regulating section, and a pressure-holding mixing section are added. The first pressure valve employs a narrow-slit throttling two-step rapid-closing structure, maintaining a constant positive pressure differential during pre-plasticizing and establishing a negative pressure differential when the screw stops or during injection, making the pressure in the mixing section 5-15 times the conventional back pressure. The mixing section achieves all-around mixing through three-dimensional flow division and shearing. The pressure regulating section, located downstream of the mixing section, regulates the pressure distribution throughout the process by generating back pressure and backflow, extending material residence time and promoting diffusion. The second pressure valve at the end of the screw forms a pressure match with the first and second pressure valves during the pre-plasticizing process. A pressure-holding zone is formed between the two pressure valve sections to maintain the necessary pressure during other processes when the screw stops pre-plasticizing. By combining different pressure valves and pressure regulating sections, this screw can be adapted to various polymer processing technologies such as extrusion, injection molding, blow molding, foaming, and reactive molding.