613 results about "Reactive extrusion" patented technology

Compositions for scavenging oxygen are disclosed. These compositions comprise condensation copolymers comprising predominantly polyester segments and an oxygen scavenging amount of polyolefin oligomer segments. The polyester segments comprise segments derived from typical bottling and packaging polyesters such as PET and PEN. The copolymers are preferably formed by transesterification during reactive extrusion and typically comprise about 0.5 to about 12 wt % of polyolefin oligomer segments. The copolycondensates are capable of absorbing at least 0.4 cc of oxygen per gram of copolymer in the solid state at ambient temperatures and are typically used as layers in films, liners, cups, wraps, bottles, etc. Use of these oxygen scavenging compositions in bottles provides a clear and rigid bottle similar in appearance to unmodified polyester bottles. In a series of preferred embodiments, bottles fabricated with the oxygen scavenging copolycondensates of this invention are over 99.4 wt % polyester and suitable for recycle with other polyester bottles.

The invention relates to a preparation method of recycled polyester chip microfilaments and a usage thereof, belonging to the field of plastic modification and category of composite material/alloy promoter. The polyester chip microfilament is an ideal promoter which has excellent performance, environment-friendliness, high added value, wide application range and broad market prospect and can change the mechanical property of the composite material/alloy. Recycled blow molding polyester (RPET/RPBT) is taken as main raw material, and the following formula and process are adopted for preparing the microfilament according to parts by weight: 100 parts of recycled polyester (RPET/RPBT), 5-30 parts of wire-drawing high-density polyethylene (HDPE)/ polypropylene (PP)/ linear low-density polyethylene (LLDPE), 0.1-4 parts of crosslinking agent/ chain extender/anchoring agent, 0.1-0.8 part of antioxidant, 0.5-6 parts of nucleating agent, and 1-5 parts of nucleate accelerant, and other processing aids (such as lubricant and plasticizer)/functional aids (such as fire retardant and ultraviolet absorber) can be additionally and appropriately added. The microfilament is prepared through extrusion, cooling, drawing and granulating by the reaction under 90-260 DEG C under the action of mechanical shear. The recycled polyester (RPET/RPBT) microfilament prepared in the invention can endow the composite material/alloy with excellent mechanical property.

The invention provides a preparation method of functional polyester fibers. The preparation method mainly comprises the following two steps of: firstly, mixing functional powders, polybutylene terephthalate cyclic oligomer (CBT) and a dispersing agent, performing reactive extrusion on the mixture by double screws to prepare a polybutylene terephthalate (PBT) functional master batch, wherein the functional powders are one of or several of a carbon nano tube, nano titanium dioxide, tourmaline powders, a nano-silver antibacterial agent, a nano silicon oxide and fluorescent powders; and secondly, blending and spinning the master batch, the PBT, polyethylene glycol terephthalate (PET) or polytrimethylene terephthalate (PTT) to prepare the functional polyester fibers. According to the method, the reactive extrusion process is adopted, the operation is simple and convenient, the process flow is shortened greatly, the obtained PBT functional master batch contains 30wt%-40wt% of the functional powders, and can be well dispersed in a base body, the compatibility of the obtained functional master batch and polyester polymer is good, and the fiber obtained by the method has an obvious functional effect.

The invention discloses a natural polymer/degradable polymer composite material, comprising: firstly, the degradable polymer is pre-mixed with an active material and then an active degradable polymer is prepared for reserve after reaction for 5-120 minutes at 100-180 DEG C; after the natural polymer is pre-mixed with a plasticizer, at the temperature of 80-180 DEG C, a thermoplastic natural polymer is prepared after 1-15 minutes of mixing by a screw extruder; finally, after the prepared thermoplastic natural polymer is mixed with the active degradable polymer according to the mass ratio of 5:95-95:5, at the temperature of 80-160 DEG C, the composite material is obtained by the reaction and extrusion of the screw extruder within 1-15 minutes, or obtained by extrusion on the same condition after the prepared thermoplastic natural polymer and the natural polymer are directly mixed with the plasticizer. The components of the composite material provided by the invention have excellent compatibility and superior mechanical property, processing performance and water resistance performance, thus having very wide application prospect; and the preparation method is simple and belongs to a continuous mode of production, thus being conducive to large-scale and industrialized production.

A new starch-vegetable oil graft copolymer, wherein the vegetable oil has been reacted onto the starch backbone using thermal or free radical initiators has been produced in a twin-screw co-rotating extruder. The starch-vegetable oil graft copolymer can further be reinforced with biofiber in the presence of an optional modifier such as maleic anhydride by reactive extrusion processing to form composites suitable to be injection molded into biodegradable articles.

A method for preparing a polyimide includes introducing a mixture of an oligomer and a solvent to an extruder, removing solvent via at least one extruder vent, and melt kneading the oligomer to form a polyimide. The polyimide has a low residual solvent content. The method is faster than solution polymerization of polyimides, and it avoids the stoichiometric inaccuracies associated with reactive extrusion processes that use monomers as starting materials.

The invention relates to a biodegradable multilayer material, which can be a thin film material or a sheet material. The biodegradable multilayer material at least comprises one of an adipic butanediol terephthalate copolymer (PBAT)/PBAT-chain extender-polypropylene carbonate (PBAT-Co-PPC)/PPC blend layer, a PBAT/PBAT-chain extender-polylactic acid (PBAT-Co-PLA)/PLA blend layer and a PBAT/PBAT-chain extender-polyhydroxyalkanoate (PBAT-Co-PHA)/PHA blend layer, and blend resins are respectively prepared through twin-screw reactive extrusion. The multilayer material is produced by using extrusion and coextrusion methods, has a function that the transmission rates of oxygen, carbon dioxide and water vapor can be adjusted, and can be applied to the packaging field and the agriculture field, and especially applied to food packaging, pharmaceutical packaging, and ground film mulching.

A thermoplastic polymer blend of a bi-continuous phase structure contains thermoplastic starch, at least one synthetic polymer, and a hydrolysis component on PVAc basis. The starch component of the polymer blend has a molecular weight which is only minimally reduced relative to native starch. The thermoplastic polymer blend is produced by reactive extrusion of a mixture of native starch and at feast one hydrophobic polymer with addition of a hydrolyzed component on polyvinyl acetate basis and of lower polyfunctional alcohols and water in the presence of an acidic catalyst. The thermoplastic polymer blend is used for producing injection molded, deep-drawn, or blow-molded parts, foils or raw materials for fibers as well as material for melt film coatings.

The invention discloses a method for preparing semi-aromatic polyamide. The method is characterized by comprising the following steps of: adding 200 to 800 parts of monomer, 1 to 10 parts of catalyst and 50 to 200 parts of deionized water into a reactor, and reacting at the temperature of between 200 and 250 DEG C for 2 to 5 hours; exhausting gas, vacuumizing until the vacuum degree is 0.07 to 0.09MPa, filling inert gas until the vacuum degree is 0.5 to 1.5MPa, reacting at the temperature of between 220 and 280 DEG C for 1 to 2 hours, and repeating gas exhausting, vacuumizing, gas filling and reacting operation for 1 to 4 times; and reducing the temperature, discharging, grinding a solid, washing, drying, adding into a reactive extruder, and performing reactive extrusion at the temperature of between 260 and 320 DEG C and the vacuum degree of 0.07 to 0.09MPa for 1 to 30 minutes to obtain high molecular weight semi-aromatic polyamide resin with the intrinsic viscosity [eta] of 1.0 to 2.5dL.g<-1>, the melting point Tm of 280 to 330 DEG C and the initial thermal decomposition temperature Td of 420 to 440 DEG C.

A composition comprising a blend of a polyolefin, polylactic acid, and a reactive modifier. A method of producing an oriented film comprising reactive extrusion compounding a mixture comprising polypropylene, polylactic acid, a reactive modifier to form a compatibilized polymeric blend, casting the compatibilized polymeric blend into a film, and orienting the film. A method of preparing a reactive modifier comprising contacting a polyolefin, a mulltifunctional acrylate comonomer, and an initiator under conditions suitable for the formation of an epoxy-functionalized polyolefin wherein the epoxy-functionalized polyolefin has a grafting yield of from 0.2 wt.% to 15 wt.%.

The preparation process of functional polyolefin resin includes electronic beam or gamma-ray pre-irradiation treatment of functional polyolefin resin; mechanical mixing of polyolefin resin after pre-treatment, functional monomer and electron donor reagent; and reacting extrusion for the polyolefin resin in molten state and functional monomer to produce grafting reaction. The polyolefin resin includes polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-styrene copolymer, polystyrene, etc; the functional monomer is unsaturated organic acid or its derivative with amino group, isocyanate, hydroxyl group or other reactive functional group; and the electron donor reagent includes electron-rich compound with P, N, S or O element, p-benzoquinone, triphenyl phosphite, triphenyl phosphate, etc.

A method for preparing a thermoplastic vulcanizate, the method comprising introducing an elastomer and a thermoplastic resin to a reaction extruder, where the elastomer is not prepared by gas-phase polymerization methods, and where less than 75 parts by weight oil, per 100 parts by weight elastomer, is added to the extruder with the elastomer, introducing a curative to the extruder after said step of introducing an elastomer, introducing an oil to the extruder after said step of introducing an elastomer but before or together with said step of introducing a curative, and introducing an oil to the extruder after said step of introducing a curative.

The invention described is a process for the preparation of dynamically vulcanized thermoplastic elastomers comprising melt processing under shearing conditions in melt reaction extruder, A) at least one thermoplastic resin, B) at least one vulcanizable gas-phase elastomer having a Mooney viscosity (ML₁₊₄(125° C.)) of from about 65 to about 450, C) a curing agent or agents, and D) process oil, wherein said process oil D) is added to the extruder in at least three oil injection positions located a) at least one location before or within the first 15% of the total length of the extruder; b) at least one other location prior to, at or within 10% total extruder length after the onset of the vulcanization of said gas-phase elastomer; and c) at least one location subsequent to the location of the point at which the vulcanization of said gas-phase elastomer is substantially completed; wherein the direct oil injection locations into the extruder are positioned at or immediately before one or more distributive mixing elements, which distributive mixing elements are immediately followed by one or more dispersive mixing elements. Thermoplastic vulcanizates capable of being extrusion molded with a smooth surface and low surface spot count, in addition to excellent elastomeric properties, are obtained through the use of the process described.

The invention relates to a wood plastic composite material and the method for preparing the same. The method comprises following steps: mixing raw mterial, polymerizing and extrusing in screw compressor. The raw material and their proportion by weight are as follows: wood powder or plant fiber 100, polyolefin with high melting index 10- 30, normal polyolefin 30- 50, maleic 0.1- 1, and peroxide 0.015- 0.15, and the high melting index MI is 20- 50. The invention employs plastic grafting technology, plastic alloy technology and mixed material intercrossing net conception to produce wood plastic composite material suitable for construction module. The method can take mixed recovered plastic of various variety and brand as raw material, which reduces strict requirement for plastic material and increases mechanical property for wood plastic composite material. The invention is characterized by converting disadvantages in process to advantages for mechanical property by employing effective processing technology and method.

High-performance inorganic filled thermoplastic polyester composites are provided, and the process for preparing thereof. Biodegradable inorganic filled thermoplastic polyester composites are provided by reactive melt-blending of biodegradable thermoplastic polyesters with inorganic fillers using a reactive extrusion processing.

The invention belongs to the technical field of high polymer materials, and particularly relates to an exfoliated montmorillonite/maleic anhydride-styrene ionomer composite material as well as a preparation method and an application thereof. The preparation method disclosed by the invention comprises the following steps: by virtue of in-situ intercalation free-radical polymerization, enabling monomers to enter organic montmorillonite (MMT) sheet layers via a diffusion action and then polymerizing among the MMT sheet layers, and opening and exfoliating the MMT sheet layers by virtue of polymerization heat, so as to form an exfoliated montmorillonite and maleic anhydride-styrene copolymer composite material; and performing hydrolysis and salinization on the copolymer composite material to prepare the exfoliated montmorillonite and maleic anhydride-styrene ionomer composite material. The ionomer composite material can be used as a nucleating agent for PET (polyethylene terephthalate), and is capable of remarkably increasing the crystallization temperature and crystallization speed of the PET. The ionomer composite material is simple in preparation method, capable of adopting a one-time process of mixing-reaction extruding granulation with the PET, convenient to operate, high in benefits, low in cost, and suitable for industrialized production.

The invention relates to a reactive extrusion matte agent, a low gloss PC/ABS alloy by using the reactive extrusion matte agent and a preparation method thereof. The low gloss PC/ABS alloy comprises the following components of: by weight, 20-80% of a polycarbonate resin, 5-50% of an ABS resin, 5-40% of a styrene-acrylonitrile resin, 1-10% of the reactive extrusion matte agent and 0.1-1.5% of a processing aid. The preparation method provided by the invention comprises the following steps of: premixing the above materials in a high-speed mixer for 3-10 minutes, allowing the premix to enter intoa double screw extruder for melting extrusion at the temperature of 230-300 DEG C, cooling, followed by granulation to obtain the low gloss PC/ABS alloy. In comparison with the prior art, the preparation method provided by the invention has advantages of reasonable technology, low cost, high efficiency of reducing gloss and stable product performance.

The invention discloses a method for preparing a modified cellulose fire-retardant fiber through reaction extrusion, and the method comprises the following steps of: 1. preparing a fire retardant, cellulose, a solvent and an acid-binding agent into a mixture according to a certain mass ratio, wherein the fire retardant is a novel phosphorus-based fire retardant, the cellulose is one of wood pulp, cotton pulp or bamboo pulp, the solvent is ion liquid, the acid-binding agent is potassium carbonate, the proportion is as follows: the mass ratio of the acid-binding agent to the fire retardant is 0.1-0.5:1, the mass ratio of the fire retardant to the cellulose is 0.5-2:1, and the mass ratio of the cellulose to the solvent is 10-25:90-75; 2. feeding the mixture into a double-screw extruder, and synchronously carrying out dissolution, reaction and extrusion of the cellulose through a reaction extrusion method to obtain the freshly formed filament of modified cellulose; and 3. stretching, washing, thermoforming and curling the freshly formed filament to prepare the modified cellulose fire-retardant fiber. The modified cellulose fire-retardant fiber obtained through the method disclosed by the invention has the advantages of no halogen, environmental friendliness without pollution and outstanding flame-retardant effect.

The invention discloses a high-throughput hydrophilic modified polypropylene hollow fiber membrane. The preparation method comprises the following steps: grafting a hydrophilic grafting monomer silane coupling agent to a polypropylene molecular chain through a reaction extrusion method; mixing two esters with different polarities and a high boiling point and an additive according to a certain ratio, heating and blending the mixture in a reactor so as to obtain a uniform membrane casting liquid; spinning, cooling, thermally extracting, and reeling the membrane casting liquid by a double-screw extruder and a spinning machine so as to obtain membrane wires; finally extracting esters with ethanol, and subjecting the membrane wires to thermal setting so as to obtain the polypropylene hollow fiber membrane. The preparation method is simple. The prepared polypropylene hollow fiber membrane has the advantages of high strength, stable hydrophilic property, and high water throughput, and can be used to produce membrane devices or membrane biological reactors (MBR).