67results about How to "Dense cells" patented technology

The invention provides a preparation method of polypropylene foaming beads. Homo-polypropylene as base resin and ammonium polyphosphate as a fire retardant undergo foaming in the presence of a foaming agent so that the polypropylene foaming beads are prepared. The preparation method comprises that two or more stages of propylene homopolymerization reactions occur in two or more reactors connected in series, wherein external electron donors used in the two or more stages of reactions respectively comprise silane and diether compounds. The preparation method utilizes the wide-molecular weight distribution high-melt strength polypropylene as a raw material, realizes polypropylene raw material stabilization, effectively enlarges a foaming window, has easily adjustable processes and a low cost, can prepare the polypropylene foaming beads having uniform foam pore diameters, compact foam pores, uniform pore size distribution and a closed pore structure and can be widely used in occasions of automobile parts, electronic packaging and building decoration having high flame-retardation requirements on foamed plastic products.

The invention discloses a method for preparing an epoxide resin foaming material. The method comprises the following steps that: 1. according to the mass ratio, epoxide resins, foaming agents, foam stabilizing agents and addition agents are respectively picked up and evenly mixed with high-speed stirring; 2. the mixture obtained is put in an oven with a temperature of between 40 and 80 DEG C and pre-heated for 0.5 to 1 hour, and the mixture is taken out and cooled down to a temperature of between 25 and 35 DEG C; 3. The mixture is added with curing agents and evenly mixed; 4. the mixture is put in a stainless steel mold and heated at the temperature of between 40 to 80 DEG C for 0.5 to 2 hours, and the mixture is cooled down to the room temperature and taken out, and finally the finished products are obtained. By controlling reaction conditions, the invention realizes the association control of the chemical foaming and the curing molding of epoxy, and the foaming multiplying factor is as high as 2.7, and products prepared by the method are good in water resistance, chemical corrosion resistance and strength. The method of the invention has the advantages of easy buying of materials, simple operation and easy industrialization, and provides a new path for preparing thermosetting foaming materials.

The invention relates to a high-melt-strength anti-impact polypropylene foamed board. The foamed board is prepared through foaming with high-melt-strength anti-impact polypropylene as matrix resin. The high-melt-strength anti-impact polypropylene comprises a random copolymerization polypropylene continuous phase and a rubber dispersed phase of propylene-ethylene copolymer, wherein the content of room temperature dimethylbenzene soluble substances of the high-melt-strength anti-impact polypropylene is larger than 10 wt% and smaller than 35 wt%, and the ratio of Mw of room temperature trichlorobenzene soluble components to Mw of room temperature trichlorobenzene insoluble components is larger than 0.4 and smaller than 1. The invention further relates to a preparation method of the foamed material. The foamed material has higher melt strength, so foamed products with higher foaming ratio and better surface smoothness can be obtained, and the foamed material also has the characteristics of being high in rigidity, high in toughness and the like. Meanwhile, the foamed board has the advantages of being good in high-and-low-temperature anti-impact performance, high in physical heat resistance, high in percentage of close area, good in heat insulation and sound isolation performance, controllable in foaming ratio and foam pore structure and the like.

The invention discloses single-component polyurethane foam rubber and a preparation method thereof. The single-component polyurethane foam rubber is prepared from the following components in parts bymass: 30 to 100 parts of polyether polyol and/or polyester polyol, 0.5 to 5 parts of a crosslinking agent, 1 to 15 parts of an opening agent, 0.5 to 10 parts of gas-phase white carbon black, 1 to 3 parts of a foam stabilizer, 0.2 to 5 parts of a catalyst, 1 to 10 parts of supercritical fluid and 30 to 150 parts of polyisocyanate. According to the single-component polyurethane foam rubber and the preparation method thereof, a supercritical foaming technology and a single-component polyurethane foaming technology are integrated. The supercritical fluid of the single-component polyurethane foam rubber is used as a brand-new environmentally-friendly adhesive, so that the prepared single-component polyurethane foam rubber has dual advantages of foam hole compactness and high foaming rate, and is inevitably widely applied to occasions with requirements for high intensity.

The invention provides a preparation method of polypropylene foamed beads. The preparation method comprises the steps of preparing polypropylene according to a following method, adding organic peroxides into obtained polypropylene serving as matrix resin, and foaming by virtue of a physical foaming agent, so as to obtain the polypropylene foamed beads, wherein the method of polypropylene comprises the step of carrying out propylene polymerization reaction including two or more stages in two or more reactors which are connected in series for operation, wherein external electron donors used in the two stages are respectively alkane compounds and diether compounds. According to the preparation method, high-melt-strength polypropylene with wide molecular weight distribution is taken as a raw material, the organic peroxides are taken as a surface modifier of EPP beads, and the closed-hole-structured polypropylene foamed beads having the advantages that the diameters of foamed holes are uniform, the foamed holes are compact and the hole distribution is uniform can be prepared; the polypropylene foamed beads can be applied to the fields such as automobile manufacturing, packaging, building insulation, sport equipment, living goods, aerospace and the like.

The invention discloses a TPU/EVA supercritical foam composite material and a preparation method thereof. The TPU/EVA supercritical foam composite material is prepared from, by weight, 300-360 parts of a thermoplastic polyurethane elastomer, 66-73 parts of an ethylene-vinyl acetate copolymer, 25-33 parts of a maleic anhydride grafting modifier, 9-14 parts of peroxide and 1.2-1.6 parts of a nucleating agent. The TPU/EVA supercritical foam composite material has the advantages of good foaming effect, high foaming efficiency, uniform, small and dense cells, excellent mechanical properties and useproperties such as light weight and high strength, high tensile strength, large elongation at break, good mechanical properties, high tear strength, good tear resistance and low density.

The invention discloses a PU foaming shoe material capable of releasing negative ions and a preparation method thereof. The PU foaming shoe material is prepared from the following raw materials in parts by weight: 70-80 parts of polyester polyurethane, 12-16 parts of ethylene-vinyl acetate copolymer, 5-7 parts of styrene-ethylene-butadiene-styrene block copolymer, 4-6 parts of a negative ion additive, 1.2-1.7 parts of 4-methylbenzenesulfonyl hydrazine, 0.45-0.55 parts of triethylene diamine, 0.08-0.12 parts of triallyl isocyanurate, 2-3 parts of talcum powder, 2-4 parts of titanium dioxide, 1-2 parts of zinc oxide, 2-4 parts of stearic acid and 1.5-2.7 parts of zinc stearate, wherein the negative ion additive is a mixture of opal powder and medical stone powder, and the mass ratio of opalpowder to medical stone powder is 1: (0.6-0.8). The PU foaming shoe material capable of releasing negative ions is small in density and light in weight; the indentation hardness is high, the tensile strength is high, and the mechanical property is good; the rebound rate is high, the compression set rate is low, the elasticity is good, and permanent deformation is not likely to happen in the usingprocess; and the overall performance is excellent.

The invention relates to a heat insulation board and a preparing method thereof, in particular to a phenolic foam heat insulation board of a core-shell structure and a preparing method thereof. Surface layers of the phenolic foam heat insulation board are made of phenolic foam, the core layer of the phenolic foam heat insulation board is made of polyurethane foam, a phenolic resin system accounts for 100 parts, and a polyurethane prepolymer system accounts for 20 parts by mass. The materials are foamed in a mold according to a preset synthetic process, solidified, cured and formed to obtain the phenolic aldehyde foam heat insulation board with good tenacity, and the defect that a phenolic foam board with certain tenacity is obtained through a traditional toughening method at the cost of fire resistance reduction is overcome. Phenolic resin is endowed with softness of the core layer polyurethane foam, the heat conductivity coefficient is further reduced, and the waterproof performance of the phenolic aldehyde foam board is improved. The phenolic aldehyde foam heat insulation board can be used as heat insulation and sound insulation materials.

The invention provides a planting method of selenium-rich oranges. On the basis of a normal orange cultivation method, the planting method also comprises steps as follows: a selenium-rich nutritional agent is taken, strip-shaped fertilization ditches are formed in two opposite sides of the water drip edge of the crowns of orange trees in the flowering period during growth and cultivation of the oranges, and the selenium-rich nutritional agent and soil are blended uniformly and applied to the fertilization ditches; the selenium-rich nutritional agent and manure and urine of human beings or animals are taken and broadcast around the tree before raining or after raining in the rainy seasons of spring and summer; the selenium-rich nutritional agent, a plant surfactant and clear water are mixed and sprayed in the fruit bearing time during growth and cultivation of the oranges. After the selenium-rich nutritional agent is used, the edible rate of oranges of each mu can reach 85% or above, the juice rate reaches 50%-60%, the content of vitamin C of every 100 ml is 60-70 ml, and the content of selenium in each kilogram of orange fruits is larger than 23 mu g and is 10 times or higher that of ordinary oranges.

The invention discloses an ultra-light graphene rubber foamed insole and a preparation method thereof. The ultra-light graphene rubber foamed insole is prepared from the following raw materials in parts by weight: 65-72 parts of ethylene-vinyl acetate copolymer, 18-22 parts of liquid polyisoprene rubber, 5-7 parts of methyl vinyl phenyl silicone rubber, 6-9 parts of graphene, 12-19 parts of EVA color masterbatches, 4-7.2 parts of an aluminum silicate fiber pipe, 1.5-2.5 parts of a foaming agent, 0.9-1.2 parts of a micropore regulator, 3-6 parts of an antioxidant, 2-4.2 parts of a crosslinkingagent and 4-6 parts of zinc stearate. The ultra-light graphene rubber foamed insole is low in density, has ultra-light property, is high in resilience rate and durable, does not easily deform in a using process, is moderate, is comfortable, and has high quality, and the circumstance that the insole is damaged due to over large deformation; and the ultra-light graphene rubber foamed insole is highin water absorption rate and air permeability, good in moisture absorption, good in air permeability and comfortable to wear.

The invention discloses a nylon/polyurethane supercritical foamed composite material and a preparation method thereof. The nylon/polyurethane supercritical foamed composite material is prepared from the following raw materials in parts by weight: 300-350 parts of polyamide, 60-72 parts of polyurethane, 40-48 parts of a polyamide-polysiloxane segmented copolymer, 6-8 parts of graphene fiber, 5-7 parts of a cross-linking agent and 3-4 parts of a nucleating agent. The nylon/polyurethane supercritical foamed composite material disclosed by the invention is good in foaming effect and high in foaming efficiency; the foam holes are uniform, small and compact; the advantages of high resilience rate, low water absorption rate, good dimensional stability, small irreversible deformation after being pressed, high tensile strength, good mechanical properties, light weight, high strength and the like excellent mechanical properties and use properties are achieved.

The invention belongs to the field of antibacterial materials and products thereof, and relates to an antibacterial mildew-proof polyethylene composition and foamed beads, a preparation method thereof, and a molded body. The antibacterial and mildewproof polyethylene composition contains polyethylene base resin, a guanidine salt composite antibacterial agent, a mildewproof agent and an auxiliary agent, wherein the auxiliary agent contains a foam nucleating agent and an optional antioxidant; based on 100 parts by weight of the polyethylene base resin, the content of the guanidine salt compositeantibacterial agent is 0.05-2.0 parts by weight, the content of the mildew preventive is 0.01-5.0 parts by weight, the content of the foam nucleating agent is 0.01-10 parts by weight, and the contentof the antioxidant is 0-10 parts by weight. The antibacterial and mildewproof polyethylene composition is good in antibacterial and mildewproof effects, the water resistance is also improved, the foamed beads prepared from the antibacterial and mildewproof polyethylene composition have impact resistance and low molding temperature, and the obtained molded product is excellent in antibacterial andmildewproof performance and high in compression strength.

The invention provides a composition used for preparing a polypropylene foaming material. The composition comprises high melt-strength anti-punching polypropylene as a base resin, the high melt-strength anti-punching polypropylene comprises a propylene homopolymer ingredient and a propylene-ethylene copolymer ingredient, and is characterized in that the molecular weight distribution Mw/Mn is less or equal to 10, and is greater or equal to 4; Mz+1/Mw is greater than 10 and less than 20; the content of a room-temperature xylene soluble substance is greater than 10 wt% and less than 30 wt%; and the ratio of a room-temperature trichloro-benzenes soluble substance Mw to a room-temperature trichloro-benzenes insoluble substance is greater than 0.4 and less than 1. The invention also provides a polypropylene injection foaming formed body produced by the composition through injection foaming and a preparation method thereof, and the formed body is suitable for the fields with special requirements on the part shapes such as automobile, aircraft, and high-speed rail internal and external decoration.

The invention discloses a preparation method of double-surface foamed high-wrinkle-resistance polyurethane leather. The preparation method comprises the following steps: (1) placing base cloth in polyurethane impregnation slurry, and extruding through extruding rolls to obtain a base cloth layer, wherein the distance between each two extruding rolls is 0.3-0.6 mm; and (2) coating the base cloth layer obtained in step (1) with first polyurethane foaming slurry in a scraping manner, then solidifying in a coagulating tank which contains a dimethylformamide-water system, washing via a plurality ofwashing tanks, and drying to obtain a wet-method semi-finished product of the base cloth layer and the first polyurethane foaming layer, wherein the temperature of a drying oven for drying is controlled to be 100-180 DEG C. According to the preparation method of the double-surface foamed high-wrinkle-resistance polyurethane leather, a two-surface foaming technology is adopted, and the obtained double-surface foamed high-wrinkle-resistance polyurethane leather is fine and smooth in folding mark and is stiff; the double-surface foamed high-wrinkle-resistance polyurethane leather has a six-layered structure; and the product is environmentally friendly, DMF residues are less, and wear resistance, scratching resistance and hydrolysis resistance are excellent.

The invention discloses polyurethane foaming glue with added large-molecular modified calcium carbonate. The foaming glue is prepared from, by weight, 150-160 parts of diphenyl methane diisocyanate, 100-105 parts of propoxylated glycerin, 100-110 parts of castor oil, 5-6 parts of glycerol, 40-43 parts of diethyl phosphate, a proper amount of 1mol/L sodium hydroxide, 13-15 parts of diatomite, 5-6 parts of distilled water, 2-3 parts of triethanolamine, 3-4 parts of dibutyltin dilaurate, 3-4 parts of alpha-olefin sulfonate, 5-6 parts of simethicone, 9-10 parts of methyl methacrylate, 9-10 parts of butyl acrylate, 0.25-0.26 part of mercaptoethanol, a proper amount of methylbenzene, 0.015-0.02 part of azodiisobutyronitrile and 5-6 parts of nano calcium carbonate. The production process of the product is convenient to control, on-site foaming can be achieved, cost is low, and the prepared foaming glue is good in viscosity, excellent in sealing performance, suitable for sealing of switch cabinets and good in stability.

The invention relates to the field of polypropylene foam materials, and discloses a foamed polypropylene composition, a foamed polypropylene plate and a preparation method thereof. The composition isprepared from the following components in parts by weight: 100 parts of high-melt-strength polypropylene, 0.05 to 2 parts of guanidine salt composite antibacterial agent, 0.05 to 5 parts of mildew preventive and 1 to 15 parts of foaming agent, wherein the high-melt-strength polypropylene is prepared from the following components in parts by weight: 100 parts of polypropylene, 0.1 to 0.3 part of antioxidant and 0.25 to 10 parts of mixed butene-maleic anhydride copolymer microspheres, wherein the particle size of the copolymer microspheres is 0.1-10 [mu] m. The foamed polypropylene which is compact in foam hole, uniform in pore size distribution, smooth in surface, high in thermo-oxidative aging resistance and capable of being recycled in a non-crosslinking mode can be prepared in an extrusion molding mode.