44results about How to "Improve extrusion stability" patented technology

The present invention relates to a method of producing an ethylene-vinyl alcohol copolymer resin.

Disclosed is a composite polarizing plate wherein a transparent protection layer (40) is formed on one side of a polarizer (30) which is composed of a polyvinyl alcohol resin and a retardation film (20) composed of a polypropylene resin is bonded to the other side of the polarizer (30), which is opposite to the side on which the transparent protection layer (40) is formed. The retardation film (20) composed of a polypropylene resin may be made of a homopolymer of propylene, or alternatively made of a copolymer with another monomer which mainly consists of propylene. A liquid crystal display is obtained by arranging this composite polarizing plate on at least one side of a liquid crystal cell (50).

The invention relates to a rotation and axial vibration synergic driving method and a rotation and axial vibration synergic driving device for a plasticized transport screw rod of a directly-driven dynamic extruder. A swinging driving sleeve of the device is connected with a motor hollow shaft through a linear rolling bearing; the swinging driving sleeve is connected with a shaking ring through aligning thrust roller bearings which are symmetrically arranged on both sides of the shaking ring; the swinging driving sleeve is fixedly connected with the plasticized transport screw rod; the inner hole central line of the swinging driving sleeve is coincided with the central line of the motor hollow shaft; meanwhile, the shaking ring is connected with a joint bearing; the shaking ring is restrained by using the joint bearing, and swings by taking the joint bearing as a supporting point; the swinging driving sleeve has a cylindrical structure; the middle part of a cylinder is provided with a cylindrical through hole; and the central line of the outer cylindrical surface of the swinging driving sleeve intersects with the central line of the inner hole cylindrical surface, so that an angle alpha is formed. The swinging driving sleeve is used for driving the plasticized transport screw rod to vibrate axially during rotating, so that homologous synergic driving of the rotation and axial vibration of the screw rod are realized. The device has the characteristics of large axial vibrating amplitude of the plasticized transport screw rod, high stability, high reliability and the like.

The invention relates to a method for continuously preparing a water-in-oil high internal phase emulsion and a polymer porous material. The method for preparing the polymer porous material comprises the steps of dissolving an emulsifier in a hydrophobic monomer to obtain a solution as an oil phase; taking an aqueous solution containing an electrolyte and an initiator as a water phase; continuouslyadding the oil phase and the water phase into a twin-screw extruder respectively, and fully emulsifying the oil phase and the water phase to form an emulsion through a twin-screw shearing effect; andafter the oil phase and the water phase are fully emulsified to form the emulsion, initiating the hydrophobic monomer in the emulsion by the initiator to obtain the polymer porous material with a pore structure and adjustable pore structure morphology. Compared with the prior art, the method is simple and easy to implement, can be used for continuously producing the high internal phase emulsion,and can be used for obtaining the porous material with the special pore structure.

The invention discloses a preparation method of a polylactic acid transparent straw. According to the preparation method, 94-96% of PLA, 2-3% of PEO, 1-2% of ParaloidKM-355P, 0.4-0.8% of VINNEX*2525 and 0.1-0.2% of EBS. The preparation method comprises the following steps of: adding the PLA into a double-screw extruder, adding the PEO, the ParaloidKM-355P, the VINNEX*2525 and the EBS into the double-screw extruder from a side feeding port, and carrying out extrusion, bracing, cooling, drying and slicing to obtain a modified resin for PLA straws, wherein a barrel temperature is 160 DEG C, a diehead temperature is 165 DEG C and a screw length-diameter ratio of the extruder is 52: 1; adding the obtained modified resin for PLA straws into a beverage straw manufacturing machine to carry out extrusion, traction, cooling and trimming so as to obtain a transparent a polylactic acid straight tube, wherein the barrel temperature is 160 DEG C, the die head is additionally provided with a melt pump, the die head temperature is 165 DEG C, and a cooling water temperature is 40-50 DEG C; and putting the transparent a polylactic acid straight tube into a full-automatic bendable straw forming machine to obtain a PLA high-transparency straw. According to the preparation method, the PLA application field is extended, traditional PP straws can be replaced so that the white pollution can be decreased, and the PLA is a natural bacteriostasis material and is beneficial for human health.

The invention discloses a polylactic acid 3D printing material and a wire prepared from the polylactic acid 3D printing material. The polylactic acid 3D printing material comprises: (a) 98.0-100 partsof polylactic acid and (b) 0-2.0 parts of a processing auxiliary agent. With respect to the total weight of polylactic acid, the weight of D-polylactic acid is 0.3-5%. The structure of the polylacticacid 3D printing material satisfies the following relation: 0 DEG C<=Tx-Ty<=60 DEG C, wherein Tx is the maximum weight loss rate temperature of the polylactic acid 3D printing material, and Ty is theextrapolated initial decomposition temperature of the polylactic acid 3D printing material. It is found through research that when the structure of the polylactic acid 3D printing material satisfiesthe following relation: 0 DEG C<=Tx-Ty<=60 DEG C, and when the wire drawing extrusion speed of the polylactic acid 3D printing material is 45 Kg/h, and the diameter of the extruded wire is 1.75 cm, the wire diameter range is no more than 0.12 cm, and the relative deviation of the wire diameter is less than 5%. Therefore, the wire extrusion stability is well developed.

A process for producing an ethylene-vinyl alcohol copolymer resin, including feeding EVOH into an extruder, keeping the temperature of the melting resin in the extruder at 70 to 170° C., adjusting the amount of water in the extruder so that the water content right after being discharged from the extruder is 5 to 40 weight %, and extruding out the EVOH resin. The extruded EVOH resin is cut into EVOH pellets. Thereby, it is possible to obtain resin pellets in which no spherocrystals are observed in the center of the cross section of the resin when the cross section is observed by the use of a polarization microscope, or no lubricant is contained in the resin pellets, and the angle of repose is 23° or less when the resin pellets are laminated. Thus, it is possible to provide an ethylene-vinyl alcohol copolymer (EVOH) resin pellet having a reduced discharging load to the environment and capable of being fed into an extruder smoothly without being blocked, extruding stability, and thermal stability (long-run property).

Provided is an aromatic polycarbonate resin composition containing, with respect to 100 parts by mass of a resin mixture including 60 to 99 mass % of (A) an aromatic polycarbonate resin and 1 to 40 mass % of (B) a styrene-based resin, 1 to 30 parts by mass of a compatibilizer, the compatibilizer being formed of a block or random copolymer constituted of an aromatic vinyl monomer unit and an acrylate-based monomer unit. This aromatic polycarbonate resin composition has improved transparency and improved extrusion stability.

An electric field type extruding head of polymer extruder features that a pair of plate electrodes are arranged on the ordinary extruding head for applying pulse or DC voltage across them to generate an electric field, which can orient the macro-molecular chains and molecular chains in fused polymer, lowering the viscosity of fused polymer and decreasing the extruding pressure.

The invention belongs to the technical field of engineering protection, and particularly relates to a gabion protective net which comprises a net body, the net body is filled with stones, a set of pull rods are arranged at the top of the net body, and one ends of the pull rods penetrate through the stones and then are connected with the net body through quick connecting units. A nut sleeves the other end of the pull rod and is in threaded connection with the pull rod; a round gasket is sleeved on the pull rod between the nut and the net body; after the net body is filled with stones, the two ends of each pull rod oppositely pull the net body through cooperation of the pull rods and the nuts, so that the net body locks the stones, looseness of the stones is reduced, the stones in the net body are mutually embedded due to extrusion of the net body, and the hardening and curing effects of the stones in the net body are further improved; the maintenance time of the net body shape is prolonged, the covering effect on the bottom of a riverbed is further improved, scouring of water flow to the riverbed is reduced, and the flood control quality of a river bank dam is improved.

The invention discloses a silane cross-linking semi-conductive inner shielding material and a production process thereof. The production process comprises the following steps: preparing a high-conductivity material A; preparing a catalytic material B; mixing and extruding the high-conductivity material A and the catalytic material B into a mixture; performing warm water crosslinking on the mixture to obtain a finished product. In a manufacturing process of the high-conductivety material A, an ethylene- vinyl silane copolymer is subjected to warm water cross-linking, so silane grafting reaction in a traditional process is avoided, the reaction temperature is within 140 DEG C, no coke is produced, the production continuity is good, the stability is high, the energy consumption is low, continuous production can be realized without stopping, periodically shutting down equipment to clear the coke in the equipment is not needed, a prepared cable material is excellent in mechanical and insulating properties and semi-conductivity, which is conducive to improving the transmission capacity of a power grid, improving the wind resistance of a line, and improving and enhancing the safety and reliability of a distribution system.

The invention relates to a vinylidene chloride copolymer composition, its preparing method and its membrane or sheet material. The vinylidene chloride copolymer composition of the present invention is the copolymer composition formed by vinylidene chloride and a polymerism vinyl monomer, and is characterized in that the scope of the volume-average diameters of the particle of the copolymer composition is in 200mum-500mum, and the half-peak overall width of the particle size distribution by volume-average expression is below 150mum.

An electrical cable having at least one conductor and at least one extruded insulating coating layer. The extruded insulating coating layer includes a polymeric composition having a polyethylene grafted with at least one unsaturated carboxylic acid of general formula (I):

in which: R represents H or CH₃; n represents 0 or 1. The grafted polyethylene is derived from polyethylene, a radical initiator and at least one unsaturated carboxylic acid of general formula (I) in free form; and the unsaturated carboxylic acid is present in an amount of between 0.0006% and 0.25% by weight. The amount is expressed as the weight content of —COOH groups relative to the total weight of the polymeric composition.