1040 results about "Melt mixing" patented technology

The invention relates to a process for producing mouldings by injection moulding, the steps in the process being A) Melting a mixture made from a) a (meth)acrylate copolymer composed of from 40 to 100% by weight of free-radical-polymerized C1-C4-alkyl esters of acrylic or methacrylic acid and from 0 to 60% by weight of (meth)acrylate monomers having an anionic group in the alkyl radical, where the copolymer comprises b) from 0.1 to 3% by weight of a release agent, and, where appropriate, the mixture may comprise c) from 0 to 50% by weight of a drier, d) from 0 to 30% by weight of a plasticizer, e) from 0 to 100% by weight of additives or auxiliaries, f) from 0 to 100% by weight of an active pharmaceutical ingredient, g) from 0 to 20% by weight of another polymer or copolymer, where the amounts given for components b) to g) are based on the (meth)acrylate copolymer a) and the mixture prior to melting has a content of more than 0.5% by weight of low-boiling constituents with vapour pressure of at least 1.9 bar at 120° C., B) Devolatilizing the mixture in the thermoplastic state at temperatures of at least 120° C., thereby lowering to not more than 0.5% by weight the content of the low-boiling constituents with vapour pressure of at least 1.9 bar at 120° C., C) Injecting the molten and devolatilized mixture into the mould cavity of an injection mould, the temperature of the mould cavity being below the glass transition temperature of the (meth)acrylate copolymer by at least 10° C., cooling the molten mixture, and removing the resultant moulding from the mould.

A heat-shrinkable article suitable for use as an insulating or coating material comprises a crosslinked composition of a polypropylene homopolymer or copolymer and an ethylene-propylene elastomer. The article is formed by a process comprising: i) creating a blend of the polypropylene homopolymer or copolymer and the ethylene-propylene elastomer by melt mixing; ii) melt processing the blend produced in i) to produce a melt processed material; iii) crosslinking the melt processed material produced in ii) by exposing it to radiation to produce a crosslinked material; iv) stretching the crosslinked material at a first temperature close to or above its softening or melting point and subsequently cooling it to a second temperature below its softening or melting point, to thereby freeze the crosslinked material in its stretched form. Subsequent heating of the article close to or above its softening point or crystalline melting point results in recovery of the pre-stretched dimensions of the article. Due to its relatively high content of polypropylene, the heat-shrinkable article thus produced has greater toughness and rigidity than polyethylene-based systems, making it suitable for use as insulation for wires and cables a heat-shrinkable corrosion resistant sleeves for high-temperature transmission pipeline joints, and for heat-shrinkable tubing or shapes for electrical insulation and mechanical protection.

The invention provides a high wear-resistant wood-plastic composite and a preparation method thereof, and relates to a composite obtained by mixing modified plant fiber powder, modified nano ceramics particles and plastic powder. The high wear-resistant wood-plastic composite comprises the modified plant fiber powder, the modified nano ceramics particles, the recycled plastic powder and the like, wherein the modified nano ceramics particles comprises modified nano Al2O3, modified nano Si3N4, modified nano SiC or the mixture thereof, which can obviously improve the microhardness of the wood-plastic composite, reduce the wear rate and improve the mechanical property. The high wear-resistant wood-plastic composite is prepared from the components by the common melt-mixing method in the plastic processing. The surface hardness and the wearability of the wood-plastic composite are greatly increased, and the strength and the toughness are also greatly improved, so that the overall performance of the wood-plastic composite is greatly enhanced. The wood-plastic composite can be used in the fields of construction material, furniture, package and the like.

A process for the preparation of microsynthetic carrier comprising the melting of a mixture of binder resin, magnetic component, colorant and optionally charge control additive, thereby forming a polymer melt, and mixing said mixture in a melt mixing device, cooling and pelletizing said mixture, and thereafter grinding and classifying said pellets.

The invention discloses a kind of heavy-duty zinc-based powder coating and its preparation. The coating is prepared by the following share weight of raw materials through the melt extruderion-mixing or melt-mixing, and the raw materials are as follow: 50-75% of resin and its flow-curing system, 10-40% of zinc flake, 0.1-10% of nanomaterial, 0.1-20% of rust paint, 0-30% of filler, and 0.1-5% of other functional additives.

A method of making a resin composition comprises melt mixing a first polymer comprising a polyamide powder or a polyester powder with a fluoropolymer at a temperature below a softening temperature of the fluoropolymer to form a first melt blend; fibrillating the fluoropolymer in the first melt blend to form a fibrillar network in the first melt blend; and melt mixing the first melt blend having the fibrillar network with i) a poly(arylene ether) and a compatibilizing agent or ii) a poly(arylene ether) and a reaction product of the poly(arylene) and a compatibilizing agent.

A composition comprises a poly(arylene ether), a polyamide, a reinforcing filler, a phosphinate, and an optional impact modifier. The composition is made by melt mixing a poly(arylene ether), a compatibilizing agent, a polyamide, a reinforcing filler, an optional impact modifier, and a flame retardant masterbatch wherein the flame retardant masterbatch comprises a phosphinate and a thermoplastic resin.

The invention relates to a surface precipitation-free flame-retardant polypropylene compound and a preparation method thereof. The surface precipitation-free flame-retardant polypropylene compound comprises the following components by weight percent: 70-98.5% of polypropylene resin, 1-15% of melamine hydrobromide, 0.3-7% of phosphinates, 0.2-4% of flame retardant synergist, 0-2% of synergetic flame retardant, 0-1% of antioxidant and 0-1% of processing acid. The preparation method thereof is implemented as follows: weighting the above components based on proportion, evenly mixing, melt-mixing the above mixture, pelletizing and drying to obtain the product in the invention. The surface precipitation-free flame-retardant polypropylene compound has high flame retardant efficiency, good flowability, no precipitation, and high flame retardant rating up to UL94 V-0, and can satisfy the use requirements of flame retardant materials in building materials, electrical appliance casings, sockets, bellows, lighting lamps and the like.

The invention relates to a preparation method of open-cell foamed polyolefin. The preparation method comprises the following steps of: mixing the polyolefin with nucleating agent master batch prepared by same olefin type polyolefin granules, a nucleating agent, a foaming-assisting anti-shrinking agent and an antioxidant, putting the obtained mixture into a single-screw or double-screw extruder with the length-diameter ratio of 20-50 for heating, plasticizing and melting, injecting high-pressure gas, fully melting, mixing and extruding out the high-pressure gas and the polyolefin, releasing, expanding, foaming when extruding the obtained mixture out of a mold at an outlet mold of the extruder so as to prepare open-cell foaming products with various shapes. The open-cell foamed products are used as adsorption substrates and adsorption carriers, and can also be used as sound-insulating, sound-absorbing, and heat-insulating materials. According to the strength and visco-elasticity of the polyolefin melt, the invention selects an appropriate position to inject the high-pressure gas, and adjusts the structure of the screw, gas pressure and gas quantity, and the heating temperature so as to lead the polyolefin to be fully foamed and cells to be opened thereon when the materials are extruded out of the outlet mold of the extruder, therefore, the gas among the cells is mutually communicated, thus having relatively high adsorption capacity, overcoming the shortage of difficult cell-opening in the existing polyolefin foaming technology and causing the polyolefin application to be more diversified and practical.

A fabric softener composition is provided by melt mixing a fabric softener component and a carrier component to provide a fabric softener composition exhibiting a melting point greater than 90° C. The weight ratio of the fabric softener component to the carrier component can be between about 1:19 and about 19:1. Methods for manufacturing the fabric softener composition and using the fabric softener composition to soften fabric while drying laundry in a dryer are provided.

A complete biological degradable starch/polyester plastics and its production are disclosed. It consists of thermoplastic starch, fatty-aromatic block co-mixed polyester, long-chain unsaturated carboxylic acid or acid anhydride graft modified ingredient, organic peroxidate initiator, polyhydric alcohol ester compound plasticizer, organic compound or polyhydric alcohol stabilizer or lubricant. The process is carried out by mechanical-chemical modification and thermoplastic treating, melt mixing fatty-aromatic block co-mixed polyester material with initiator, modifier and stabilizer in high-speed mixer, graft reacting, milling, cooling, breaking, reaction extruding by second bi-screw reaction extruder and granulating. Its advantages include excellent physical and mechanical properties, complete degradation. It can be used for agriculture, medicine, sanitation, engineering materials, refuse bag and packing materials.

The invention provides a biodegradable resin material applied to oil and gas fields and a preparation method for the biodegradable resin material. According to the preparation method for the biodegradable resin material applied to the oil and gas fields, two or three polymers of polyglycolic-colactic acid, polycaprolactone and polylactic acid and a chain extender are subject to melt mixing reaction to obtain a resin alloy, namely the biodegradable resin material applied to the oil and gas fields. The biodegradable resin material applied to the oil and gas fields is prepared from the method, can be prepared into the shapes of sheets, powder, granules, spheres and the like, or can be prepared into the shapes of the sheets, the powder, the granules, the spheres and the like by one of the polyglycolic-colactic acid, the polycaprolactone and the polylactic acid, is used for temporarily blocking filtrate to protect a reservoir, temporarily blocking a blast hole, a constructed layer section and the like in various construction (well drilling, well completing, well repairing, and acidizing and fracturing) operations of the oil and gas fields, and has the advantages of complete degradation and zero damage to stratum.

An abradable dry powder coating (22) composition for coating onto a surface (12) for subsequent curing to form into an abradable coating, including a powder (16) formed of uncured thermoset resin with at least 15 volume percent filler, wherein the filler does not substantially melt below the cure temperature of the resin. Method for making the coating composition includes melt-mixing the thermoset resin with at least 15 volume percent of filler, cooling the resulting mass composite, and then breaking the cooled mass composite into powder particles (16). Method of coating an article with an abradable coating includes applying the dry composite powder with the filler therein onto a substrate and curing the dry powder composition, preferably by electrostatic coating. An article is also disclosed which is coated with the abradable coating.

A method for manufacturing a cellulose ester film comprising the steps of 1) mixing a cellulose ester exhibiting a water content of not greater than 3.0 weight %, at least one plasticizer selected from the groups A and B in an amount of one to thirty weight % of the cellulose ester, and at least one additive selected from the groups of C and D in an amount of 0.01 to 5 weight % of the cellulose ester to obtain a mixture, group A: ester plasticizers formed from a polyhydric alcohol and a monohydric carboxylic acid; group B: ester plasicizers formed from a polyhydlic carboxylic acid and a monohydric alcohol; group C: hindered phenol anti-oxidants; group D: hindered amine light stabilizers, 2) heating to melt the mixture at a temperature (Tm) of between 150 and 300° C., and 3) forming a cellulose ester film with a melt casting method employing the melted mixture.

Disclosed is a radiation shielding member having improved radiation absorption performance, including 80.0˜99.0 wt % of a polymer matrix or metal matrix and 1.0˜20.0 wt % of a radiation shielding material in the form of nano-particles having a size of 10˜900 nm as a result of pulverization, wherein the radiation shielding material is homogeneously dispersed in the matrix through powder mixing or melt mixing after treatment with a surfactant which is the same material as the matrix or which has high affinity for the matrix. A preparation method thereof is also provided. This radiation shielding member including the nano-particles as the shielding material further increases the collision probability of the shielding material with radiation, compared to conventional shielding members including micro-particles, thus reducing the mean free path of radiation in the shielding member, thereby exhibiting superior radiation shielding effects. At the same density, the shielding member has reduced thickness and volume and is thus lightweight. The porosity of the shielding member is minimized, thereby preventing the deterioration of shielding effects and properties of the shielding member and realizing applicability in spent fuel managing transport/storage environments and the like.

A porous hollow fiber membrane which has high blocking performance and high water permeability suitable for filtration and the like and exhibits excellent strength, and a process for stably producing the porous hollow fiber membrane are disclosed. The process utilizes a hollow fiber molding nozzle having two or more circular discharge ports which are disposed concentrically. Multilayer melt-extrusion is performed by discharging molten mixtures which include a thermoplastic resin and an organic liquid and differ in composition from the adjacent discharge ports. The resulting product is cooled to solidify to obtain a hollow fiber. The organic liquid is then removed from the hollow fiber by extraction to produce a porous hollow fiber membrane. The molten mixture discharged from at least one circular discharge port includes an inorganic fine powder in addition to the thermoplastic resin and the organic liquid. The inorganic fine powder is removed by extraction after cooling in addition to the organic liquid.

The invention discloses an intelligent waterproof moisture-permeable film. A matrix material and a waterproof moisture-permeable functional material are prepared into the waterproof moisture-permeable film by using a screw extruder in a film blowing method or a flow casting method. The preparation method comprises the following steps of: firstly cleaning and drying the matrix material for standby application; secondly, squeezing out a thermoplastic carrier material, inorganic nanometer particles and a processing agent at a certain extrusion temperature by using the extruder in a melt mixing method according to a certain mass ratio to prepare the waterproof moisture-permeable functional material; and finally, preparing the product by adopting the film blowing method or the flow casting method at the extrusion temperature condition of 120 DEG C-250 DEG C after mixing the matrix material and the prepared waterproof moisture-permeable functional material according to a mass ratio of 100:5-200. The intelligent waterproof moisture-permeable film has excellent waterproof moisture-permeable function in all weathers, i.e. a preferential temperature and a humidity range and has the characteristics of simple production technology, low cost of raw materials and high production efficiency.

A process for the preparation of a composition useful in telecommunications jacketing comprising:(i) introducing a polyolefin into the first mixing zone of a melt/mixer having first and second mixing zones;(ii) introducing particulate carbon black per se or a premix of said carbon black and polyolefin into the first mixing zone, said carbon black being in an amount of about 2 to about 50 percent based on the weight of the polyolefin introduced into the first mixing zone;(iii) melting the polyolefin in the presence of the carbon black in the first mixing zone;(iv) mixing the carbon black and the molten polyolefin in the first mixing zone to provide a molten mixture;(v) passing the molten mixture from step (iv) into the second mixing zone;(vi) adding sufficient polyolefin to the molten mixture from step (v) to dilute the carbon black to a level of about 2 to about 3 percent by weight based on the weight of the total polyolefin in the melt/mixer;(vii) mixing the added polyolefin with the molten mixture in the second mixing zone to provide a molten mixture;(viii) about simultaneously with step (vii), venting the second mixing zone;(ix) recovering the mixture from step (vii); and(x) optionally, pelletizing the mixture from step (ix).

An abradable dry powder coating composition (20) for coating onto a piston assembly component (12) for subsequent curing to form into an abradable coating, including a powder (16) formed of uncured thermoset resin with at least 5 volume percent filler, wherein the filler does not substantially melt below the cure temperature of the resin. Method for making and coating the coating composition includes melt-mixing the thermoset resin with at least 5 volume percent of filler, cooling the resulting mass composite, and then breaking the cooled mass composite into powder particles (16). Method of coating an article with an abradable coating includes applying the dry composite powder with the filler therein onto the piston assembly component and curing the dry powder composition, preferably by electrostatic powder coating.

The invention relates to a high-impact high-stiffness polypropylene rotational molding material and a preparation method thereof. The rolling plastic rotational molding material comprises the following raw materials: by weight, 100 parts of polypropylene, 0-30 parts of polyethylene, 0-0.1 part of a crosslinking agent, 0-0.15 part of an auxiliary crosslinking agent, 1-10 parts of an elastomer, 0.1-0.5 part of an antioxidant, 0-10 parts of a nano filler, 0.1-0.5 part of a dispersing lubricant and 0-0.4 part of a surface treatment agent. According to the invention, the crosslinkable polyethylene is added in a polypropylene melt mixing process for melt curing to obtain the high-impact high-stiffness polypropylene modified rotational molding material with a semi interpenetrating network structure, and the high-impact high-stiffness polypropylene modified rotational molding material can meet the material requirements of vehicles and other different fields. The curing reaction of the polyethylene belongs to the in situ curing, the material has the unique semi interpenetrating network structure, different components are mutually bitten or buckled, the compatibility between the polyethylene and polypropylene resin can be improved, and the performance advantages of the both are full played.

A composition of matter suitable for use as a road marking substance and a method thereof provides for the steps of mixing a binder mixture with a filler mixture, heating the mixed ingredients while mixing into a homogenous molten mixture and then extruding the molten mixture. The extruded material is cooled, cut into individual pellets, coated with an anti-clumping coating and packaged for use in making a road marking substance in situ. The binder can be alkyd-based or hydrocarbon based. The binder includes rosin resins, wax and a plasticizer, and a hydrocarbon resin is added for the hydrocarbon-based binder. The filler contains titanium dioxide, a pigment (if necessary) and ground calcium carbonate.