180results about How to "Low melt index" patented technology

A multi-stage wire feeding printing head for 3D printing of continuous fiber reinforced composite materials comprises a fiber guiding pipe fixed to the upper surface of a first-stage heating block. An inner hole channel of the fiber guiding pipe forms a fiber channel. A first-stage throat pipe is fixed to one side of the first-stage heating block. An inner hole channel of the first-stage throat pipe forms a first-stage inner hole channel. High polymer materials penetrate the first-stage inner hole channel and enter a melting cavity of the first-stage heating block. The first-stage heating block is fixed above a second-stage heating block. A second-stage throat pipe is fixed to one side of the second-stage heating block. A second-stage throat pipe inner hole channel forms a second-stage inner hole channel. High-performance thermoplastic materials penetrate the second-stage inner hole channel and enter a melting cavity of the second-stage heating block. As analogized according to the same structure, finally, all the heating blocks are fixed to the upper face of the last-stage heating block, and a spray nozzle is fixed to the lower surface of the last-stage heating block. The multi-stage wire feeding printing head is adopted, multi-stage wrapping can be well performed on base materials for continuous fibers, and continuous fiber reinforced composite material parts with good comprehensive performance are obtained.

A long chain branch polylactic acid preparation method comprises the following steps: firstly, melting 100 parts of linear polylactic acid by weight at 190-210 DEG C, adding 0.5-1 part of antioxygen by weight, then adding 0.03-0.06 part of polyfunctional monomer by weight, and mixing the mixture for 10-30min to obtain the long chain branch polylactic acid; wherein, the polyfunctional monomer is one or more epoxy monomers with 3 or more of functionality. The molecular weight, the modulus and the melt strength of the product prepared by the invention are improved and the product can be used in forming processes such as foaming, film blowing and the like.

The invention discloses a high-strength linear low density polyethylene film resin which is mainly prepared from the following raw materials in parts by weight: 99.7-99.85 parts of base resin, 0.02-0.06 part of antioxidant, 0.04-0.09 part of auxiliary antioxidant, 0.03-0.08 part of heat stabilizer and 0.03-0.08 part of antistatic agent. The invention also discloses a preparation method of the high-strength linear low density polyethylene film resin. The high-strength linear low density polyethylene film resin has the advantages of low melt index, high molecular weight and high strength, and is suitable for blowing repackaging films and agricultural films; and the product has the advantages of outstanding puncture resistance, excellent impact strength, excellent tearing strength and excellent aging resistance.

The invention discloses a thermoplastic polyether ester elastomer composition as well as a preparation method and application thereof. The thermoplastic polyether ester elastomer composition comprises 80-100 parts of polyether ester elastomer and 0.1-2 parts of epoxy resin. The preparation method comprises the steps of adding the components to a high-speed mixer so as to be mixed at a high speed, and then adding the mixture to a double-screw extruder so as to be subjected to extruding granulation at 210-250 DEG C, thus obtaining the thermoplastic polyether ester elastomer composition. The thermoplastic polyether ester elastomer composition and the preparation method have the beneficial effects that by adding the epoxy resin to modify the polyether ester elastomer, the melt index of the material can be obviously reduced, the tensile strength of the material can be improved, the elongation at break of the material is relatively high, and the material has good resilience effect and good dynamic / static stiffness; the process is simple, and the production cost is relatively low; the thermoplastic polyether ester elastomer composition can be used in the fields such as track traffic gaskets and the like.

A method of preparing a polyolefin, wherein the method is used to more effectively prepare a polyolefin which has a high molecular weight and multimodal molecular weight distribution, thereby being preferably used for blow-molding or the like, and a polyolefin prepared thereby, are provided.

The invention relates to a polyethylene base resin powder for preparing an IBC barrel special material and a preparation method thereof. Polyethylene base resin is produced by a gas phase polyethylene process, the polymerization temperature is 96 DEG C-120 DEG C, and the polymerization pressure is 0.85-2.5 MPa. The prepared base resin powder is generated by copolymerization of ethylene and long-chain alpha-olefin, the weight-average molecular weight is 200-350 thousand, the molecular weight distribution index is 7-15, the alpha-olefin content is 0.5-1.5%, the melt flow rate is 5-8 g / 10 min, the density is 0.942-0.952 g / cm<3>, the low temperature impact strength (-30 DEG C) is more than 30 kJ / m<2>, and the melt strength is more than 15 cN. The special material is guaranteed to have high mechanical strength, good processing performance and high melt strength, can be guaranteed to have good antisagging property, and can meet various properties of the IBC barrel special material.

The invention belongs to the field of plastic preparation, and particularly relates to a bio-based polyethylene / starch blending modified film blowing material and a preparation method thereof. The bio-based polyethylene / starch blending modified film blowing material comprises the following components in parts by weight: 25-45 parts of bio-based low-density polyethylene, 5-25 parts of bio-based high-density polyethylene, 4-20 parts of ethylene-ethyl acrylate, 1-8 parts of a compatilizer, 30-65 parts of starch, 3-19.5 parts of a plasticizer, 1-8 parts of a dispersing agent and 1-8 parts of an accelerant. The film blowing material provided by the invention has the advantages of high bio-based content, a low melt index, good processability and strong mechanical properties, and is beneficial for industrial popularization and utilization.

The invention belongs to the technical field of high molecular materials and specifically discloses a preparation method of a conductive polyether ether ketone composite material. After a large numberof comparative tests on a polyether ether ketone substrate, a conductive filler and an additive, an optimal formula is finally obtained; the prepared conductive composite material can be used for a long term under the condition of 250-300 DEG C and has a very good mechanical property; compared with an existing alkane-based and rubber-based material, the conductive polyether ether ketone compositematerial has higher mechanical property and is greatly improved in tensile, compression and impact resistance; the conductive polyether ether ketone composite material can be widely used in chemical,metallurgy, medicine and other industries, so that the application field of the high molecular composite material under high-temperature and severe conditions is expanded.

The invention provides an external donor compound. Aluminium alkyl is introduced into a compound with calixarene group and organosilicon amino group; when used as an external donor compound of olefin polymerization catalyst with a main catalyst of Ziegler-Natta type catalyst, the compound can endow the olefin polymerization catalyst with high stereoselectivity and hydrogen response, so as to actively prepare a polymer with high fusion index and high isotacticity and a polymer with low fusion index and high isotacticity.

The invention relates to a method for reducing a flow rate of polyethylene melt, which comprises the following process steps: A, preparation of auxiliary agents: taking 100 parts of polyethylene and 5-10 parts of polyethylene cross-linking agent; B, mixing: mixing the auxiliary agents at the room temperature; C, dilution: diluting the polyethylene according to a ratio of 100:1, putting 1 part of prepared auxiliary agents into 100 parts of polyethylene, and mixing; D, feeding: putting the well diluted mixture into an extruder for granulation and extrusion, thereby achieving the effect of reducing the flow rate of the polyethylene melt. The method has the advantages of simple process, easy operation and no pollution, and can realize the industrial mass production; and the method can reduce the flow rate of the polyethylene melt with the high melt index, so that the polyethylene melt can be used as a raw material suitable for pipeline production. The invention can be widely applied in product production with the extrusion, emptying, film blowing, drawing and the like of the polyethylene melt.