34results about How to "Excellent extrusion performance" patented technology

A halogen-free flame-retardant cable material is disclosed. The cable material comprises following raw materials by weight: 60-80 parts of LDPE resin, 15-25 parts of EPDM resin, 5-15 parts of EVA resin, 70-90 parts of aluminium hydroxide, and 6-8 parts of red phosphorus. The cable material is excellent in extrusion process property, high in LOI value and good in flame retardant property.

The invention relates to a CPE (chlorinated polyethylene) and NR (natural rubber) co-used sheath rubber for rubber sheathed flexible cables. The sheath rubber provided in the invention comprises the following components by mass: 95-100 parts of chlorinated polyethylene; 0-5 parts of natural rubber; 10-15 parts of an active agent; 5-10 parts of a flame retardant; 50-60 parts of a plasticizer; 40 parts of a reinforcing agent; 60-80 parts of a filling agent; 0-3 parts of a lubricating assistant; 4-5 parts of a vulcanizing agent; and 1.5-2.5 parts of a vulcanizing assistant. The sheath rubber has a rubber content of 32-36%. The sheath rubber can satisfy the performance requirements of SE4 rubber in standards GB / T 5013-2008 ''rubber insulated cables with a rated voltage of 450 / 750V and below'' and JB8735-1998 ''rubber insulated flexible cords and flexible cables with a rated voltage of 450 / 750V and below''.

The present invention relates to a high flame retardancy composite material for a high voltage cable of a new energy automobile, the high flame retardancy composite material comprising the following raw materials in parts by weight: 5-25 parts of polyethylene resin; 25-50 parts of polyolefin elastomer; 30-50 parts of ethylene-vinyl acetate copolymer; 8-20 parts of chlorinated polyethylene; 30-60 parts of composite flame retardant; 0.2-15 parts of wear-resistant flame retardant synergist; 0.7-2.5 parts of antioxidant; 1-2 parts of lubricant; and 1.5-3 parts of cross-linking sensitising agent. The formulation of the present invention is improved, for example by using a mixture of bimodal polyethylene and high melt index high density polyethylene as a polyethylene resin and chlorinated polyethylene as a modifier, adding polyolefin elastomer and ethylene-vinyl acetate copolymer, and additionally adding a composite flame retardant, a flame retardant synergist, and an antioxidant, such that the composite material of the present invention has better flame retardancy properties and burns at a UL94 V0 grade whilst retaining the flexibility, high temperature resistance, oil resistance, and flame retardancy of high voltage cable material for use in a new energy automobile, and having excellent extrusion processing properties.

The invention provides an extrusion-grade fluororubber compound with low fuel oil permeability and a preparation method, which solves the problems of poor extrusion fluidity, large extrusion expansion rate, The technical problems of poor smoothness and flatness of the inner and outer walls of the rubber hose, high fuel permeability, and poor bonding performance with other rubber compounds. The preparation of the fluororubber compound comprises the following raw materials in parts by weight: 100 parts of fluororubber raw rubber; 1.2-2.5 parts of vulcanizing agent; 0.2-1.0 part of vulcanization accelerator; 6-15 parts of acid absorbing agent; 40; filler 10‑45; extrusion processing aid 1‑6 parts; process processing aid 1‑4 parts. The extrusion-grade fluororubber compound of the present invention not only ensures excellent physical and mechanical properties, but also significantly improves the extrusion process performance, reduces the extrusion expansion rate of fluororubber, effectively improves the fuel permeability and significantly improves the compatibility with other materials. Compound adhesive properties of rubber.

The present invention discloses modified polypropylene for manufacturing an optical fiber buffer tube, a manufacturing process and a production system thereof. The modified polypropylene comprises the following components, by weight, 96.0-97.5% of a polypropylene-polyethylene copolymer base material, 0.5-2.5% of a nucleating agent, 0.001-0.05% of a coupling agent, 0.4-2.0% of an antioxidant, and 0.5-3.0% of an additive. The manufacturing process comprises: making a rheological agent into master batch by using a polypropylene-polyethylene copolymer base material; carrying out a surface treatment on an inorganic nucleating agent by using a coupling agent; adding the polypropylene-polyethylene copolymer base material, the prepared master batch, an organic nucleating agent, the surface-treated inorganic nucleating agent, an antioxidant and a lubricant to a stirring mixing apparatus to mix to prepare a mixture; adding the mixture to a plastic extruding apparatus to carry out mastication and extrusion, and then carrying out cooling and pelletizing; and carrying out weighing and packaging. The modified polypropylene of the present invention has good impact resistance, and has mechanical and processing properties of the optical fiber buffer tube.

The invention discloses a production process for an ethylene propylene diene monomer microporous base plate. The production process comprises the following steps: adding ethylene propylene diene monomer into a kneading machine to knead, and then adding zinc oxide, stearic acid, carbon black, a moisture absorbent, an acid and alkali regulator, a softening agent and an inorganic filler into the kneading machine to knead, thereby preparing a master batch; adding the prepared master batch into an open mixing machine, adding a vulcanizing agent, a promoter, a foaming agent and a foaming aid, uniformly mixing, regulating roll spacing to 0.8-1.3 millimeters for thin-passing, carrying out triangular packaging for 3-4 times, regulating the roll spacing to 5-6 millimeters for discharging, so as to prepare a rubber compound, and standing the rubber compound for not smaller than 16 hours; putting the rubber compound on a cutter for cutting; feeding prepared rubber strips into a cold feeding extruder to extrude; sequentially feeding the prepared rubber strips into a high-temperature section, a microwave section and an oven section to carry out continuous vulcanizing until complete vulcanizing; and pulling the prepared vulcanized rubber into the cutter through a pulling machine, and cutting the prepared vulcanized rubber into a needed dimension, thereby obtaining a microporous base plate finished product. The invention further provides an ethylene propylene diene monomer microporous base plate.