31results about How to "Uniform and dense cells" patented technology

The invention discloses a preparation method of a biomass-base polyurethane foam material, belonging to the technical field of chemical industry. The method mainly comprises the following steps: mixing polybasic alcohol liquefier and liquefying catalyst, putting the mixture in a container, heating to 150-200 DEG C, adding biomass waste and industrial lignin, liquefying, and cooling to room temperature to obtain a biomass liquefied product; and mixing the prepared biomass liquefied product, foaming catalyst, foam stabilizer, foaming agent and lignosulphonate into a component A, using isocyanate as a component B, mixing the component A and component B in a mixing vessel, stirring at 20-40 DEG C at 8000-14000 rpm for 5-30 seconds, pouring the mixture into a die, naturally foaming for 5-60 seconds, standing at 80-120 DEG C for 8-24 hours, and storing at room temperature for 8-24 hours until the mixture is sufficiently aged and formed. The invention can obviously improve the properties of the biomass-base polyurethane foam.

The invention relates to an extruded and foamed thermoplastic polyurethane elastomer particle and a preparation method thereof. The particle contains the following components in percentage by mass: (A) 65%-90% of a thermoplastic polyurethane elastomer, (B) 2%-30% of a thermoplastic resin polymer, (C) 0.5%-15% of a compatilizer and (D) 0.1%-5% of a foaming nucleating agent. The preparation method of a TPU formed particle comprises the following steps: uniformly mixing the thermoplastic polyurethane elastomer, the thermoplastic resin polymer, the compatilizer and the foaming nucleating agent, putting the mixture into melt extrusion equipment, and carrying out granulation, so as to obtain a blending alloy particle; and putting the blending alloy particle into foaming extrusion equipment, carrying out melting plastification so as to obtain a melt, dissolving supercritical carbon dioxide into the melt, foaming by virtue of a mouth mold, and carrying out underwater dicing, so as to obtain the formed particle. The prepared thermoplastic polyurethane foamed particle is stable in size and basically does not shrink, the surface is bright and plumy, and the diameters of foamed holes are uniform.

The invention discloses a micro-foaming polypropylene composite material and a preparation method thereof. The micro-foaming polypropylene composite material is composed of the following components by weight: 100 parts of polypropylene, 40 to 60 parts of bamboo powder, 10 to 15 parts of foaming agent, 1 to 5 parts of foaming assistant, 1 to 5 parts of antioxygen, 1 to 3 parts of nucleating agent and 5 to 10 parts of compatilizer. The micro-foaming polypropylene composite material is wide in raw material resource, low in cost, simple to operate and wide in application prospect. The micro-foaming polypropylene composite material which has small bubble holes, is even, compact, light in weight, good in impact performance and environment-friendly.

The invention discloses a composite foaming agent and a polypropylene foam material prepared from the same. The foaming agent comprises the following components in parts by weight: 100 parts of azodicarbonamide, 10-20 parts of N,N'-dimethyl-N,N-dinitrosoterephthalamide, 10-30 parts of zinc oxide and 10-30 parts of sodium citrate. The polypropylene foam material comprises the following blended components in parts by weight: 100 parts of high-melt strength polypropylene and 3-15 parts of composite foaming agent. The composite foaming agent disclosed by the invention has controllable foaming temperature, uniform foam cell, smooth surface and high physical heat resistance; and the polypropylene foam material prepared from the composite foaming agent meets the environmental protection requirement, is degradable and low in production cost, and is suitable for continuous large-scale production.

The invention discloses a preparation method for foamed yarns. The preparation method includes preparation of a main material, preparation of an auxiliary agent, padding treatment and preparation of the foamed yarns. The preparation method has the advantages that polyether polyol, isocyanate and a tin catalyst are mixed to obtain the main material, a mixed solution of the polyether polyol, an amine catalyst, a foaming agent and a foam stabilizer is used as the auxiliary agent, an in-situ polymerization method is applied, the raw materials required for reaction are respectively padded on two yarns, solution mixing is simulated through twisting, uniform and compact polyurethane foam is formed by the yarns from inside to outside, the adhesion of a foam film layer is improved, and accordingly,the foamed yarns with unique appearances are obtained; different base materials can be prepared into fabrics with different shapes according to needs, and accordingly, the plasticity is high; the preparation method is simple, the consumed time is short, the equipment requirements are low, and wide application can be realized.

The invention relates to a TPE (Thermoplastic Elastomer) material for a foamed floating cable extruded by a common extruder and a method. According to the technical scheme, the TPE material comprises at least one of ultra-high molecular weight SEBS and ultra-high molecular weight SEEPS, 10-100 parts of long chain branch olefin polymers, 20-50 parts of white oil, 20-160 parts of reinforced resins, 5-30 parts of maleic anhydride grafted polypropylene, 5-30 parts of nano-clay, 10-40 parts of aids, and 20-200 parts of a TPE base material foamed water master batch. The material has the beneficial effects that by utilizing the low temperature sensitive and strain hardening phenomena of long chain branch olefin polymers and the characteristics of low melt viscosity and high melt strength of ultra-high molecular weight elastomers, the foamed melt has good foam structure stability at a certain temperature, the dependence on equipment and processing parameters is reduced, the product processing stability is improved, and the production cost is reduced; and moreover, foaming extrusion of the common extruder can be realized, the foaming agent is uniformly dispersed, the foaming process is stable, foam is uniform and dense, and the foamed product is fine, smooth and soft in surface, high in strength and high in weather resistance.

The invention discloses a carbon-series modified high-conductivity foaming ethylene propylene diene monomer, which is prepared from the following raw materials in parts by weight: 100 parts of raw ethylene propylene diene monomer, 5-10 parts of zinc oxide, 1-3 parts of stearic acid, 30-60 parts of carbon black, 20-40 parts of light calcium carbonate, 15-35 parts of paraffin oil, 3-6 parts of an accelerant, 0.5-1.0 part of sulfur, 5 parts of a foaming agent and 5-15 parts of a carbon-series composite component. The material prepared by the invention can realize good combination of foaming, low density and conductivity, and is suitable for rubber sealing elements.

The present invention relates to the field of polymers, and particularly provides a polyethylene composition, a foamed bead and a preparation method thereof, and a foamed bead molding body. The polyethylene composition comprises a component A, a component B, a component C and a cell nucleating agent, wherein the component A is ethylene/alpha-olefin copolymerized linear low-density polyethylene, has the melt index MIA of 0.01-2 g/10 min, and has the density [rho]A of 0.880-0.936 g/cm<3>, the component B is ethylene/alpha-olefin copolymerized linear low-density polyethylene, has the melt index MIB of 2.1-9.9 g/10 min, and has the density [rho]B of 0.910-0.930 g/cm<3>, and the component C is ethylene/alpha-olefin copolymerized linear low-density polyethylene, has the melt index MIC of 10-80 g/10 min, and has the density [rho]C of 0.880-0.930 g/cm<3>. The foamed bead prepared from the polyethylene composition has the uniform and compact cells, and the prepared foamed bead molding body has the high compressive strength.

The invention discloses an environment-friendly light brush plate for an urban cleaning vehicle. The brush plate is light in dead weight, high in homogeneity, capable of effectively improving the work efficiency of cleaning equipment and low in production cost. The brush plate is prepared from the following materials in parts by weight: 75-80 parts of a PP regenerated material, 12-18 parts of a PE regenerated material, 2.5-4 parts of modified polypropylene, 0.4-1 part of sodium bicarbonate, 0.4-1 part of azodicarbonamide, 0.05-0.1 part of tetra(3.5-bitertiary butyl-4-hydroxyl) phenylpropionic acid pentaerythritol ester, 0.05-0.1 part of stearic acid, 0.05-0.1 part of paraffin and 1-2 parts of a color master batch. The invention also provides a preparation method of the environment-friendly light brush plate for the urban cleaning vehicle.

The invention discloses a high-load brush disc for a window wiper. The high-load brush disc is characterized by being prepared from the following raw materials in parts by weight: 75 to 80 parts of a PP (Polypropene) reworked material, 12 to 18 parts of a PE (Polyethylene) reworked material, 5 to 14 parts of modified PP, 10 to 20 parts of ammonium trimethyl methyl sulfate, 4 to 10 parts of sodium bicarbonate, 5 to 8 parts of azodicarbonamide, 2 to 6 parts of pentaerythritol phenylpropionate, 30 to 35 parts of fatty alcohol polyoxyethylene ether, 2 to 4 parts of azodiisobutyronitrile, 6 to 8 parts of amino-2-methyl-1-propanol, 10 to 20 parts of a lubricant, 10 to 20 parts of a coupling agent, 1 to 2 parts of masterbatches and 2 to 3 parts of an antioxidant. According to the high-load brush disc disclosed by the invention, the PP reworked material and the PE reworked material are utilized as basic materials, full foaming and uniform extruding are carried out on the PP reworked material and the PE reworked material, heat absorption and heat release are balanced during a foaming process, higher melt strength of polypropene is kept, bubble pores are uniform and dense, no cracking exists, the homogeneity of a brush disc product can be increased, the density and the self weight of the brush disc product are reduced, and load during a working process can be borne to a larger extent by using the brush disc product as the brush disc of the window wiper.

The invention relates to the field of polymer technology, in particular to a high-modulus polypropylene/polyhedral oligomeric silsesquioxane microcellular foaming composite material and a preparationmethod thereof. The high-modulus polypropylene/polyhedral oligomeric silsesquioxane microcellular foaming composite material is prepared from a raw composition, wherein the raw composition is preparedfrom the following components in parts by weight: 92 to 97 parts of polypropylene, 2 to 3.2 parts of foaming agent, 3 to 8 parts of vinyl polyhedral oligomeric silsesquioxane, 6 to 16 parts of alkylester acrylate, 0.6 to 1.6 parts of emulsifying agent, 0.06 to 0.48 part of initiator, 0.2 to 0.4 part of antioxidant, 0.5 to 1 part of lubricating agent and 0 to 2 parts of optional assistant. The polypropylene/polyhedral oligomeric silsesquioxane composite material disclosed by the invention has the characteristics of small cell diameter and superior mechanical property, and has a wide application prospect in the field of automobile weight reduction.