44results about How to "Appropriate bulk density" patented technology

A fireproof thermal-insulating plate comprises, by weight, 16-20 parts of closed-cell expanded perlite, 3-5 parts of closed-cell vitrified micro bubbles, 11-14 parts of binder, 2-4 parts of water repellent, 0.4-0.6 part of fiberglass, and 8-12 parts of water. The closed-cell vitrified micro bubbles are 1-5mm in particle size. The closed-cell vitrified micro bubbles are 0.1-1.5mm in particle size. The fiberglass is 6-12mm in length and 5-20 micrometers in diameter. The invention further discloses a preparation process of the fireproof thermal-insulating plate. The fireproof thermal-insulating plate and the preparation process have the advantages that the closed-cell expanded perlite is used as a main setup frame, the closed-cell vitrified micro bubbles are used for assisting in gap filling, a small amount of fiberglass is added to improve tensile strength of the thermal-insulating plate, and accordingly the thermal-insulating plate is proper in volume weight, low in cost and fine in compressive property; the binder and other materials are all made of inorganic minerals and inorganic compounds with fine fireproof performance; and the preparation process is simple.

The invention relates to a catalyst used for olefin polymerization and a preparation method thereof. The preparation method is as follows: in a reactor, under the protection of nitrogen, adding an organic solvent and a titanium compound, cooling to-30 to-10 DEG C, adding a carrier, maintaining at-30 to-10 DEG C, and stirring for 30-40min; slowly heating to 100 to 120 DEG C, in the heating process, adding an electron donor compound, reacting at 100-120 DEG C for 30-40min, filtering a liquid, again adding the titanium compound, heating to 110 to 130 DEG C, maintaining at 110 to 130 DEG C for 30-40min, filtering the liquid, washing an obtained solid, and drying under vacuum to obtain a target product. In a magnesium halide alcohol adduct formation process, a forming agent and a particle form control agent are added, the particle size distribution of the obtained carrier is more concentrated, the carrier is used for preparing the catalyst, activity and hydrogen sensitivity of the catalyst can be improved when the carrier is used for olefin polymerization especially for propylene polymerization, the bulk density of an obtained polymerization product is moderate, and the polymerization product is basically free of abnormity materials.

A method for preparing a polyolefin resin powder has the steps of

• • a) heat dissolving a polyolefin resin in an organic solvent having a solubility parameter less than or equal to the solubility parameter of the polyolefin resin to obtain a polyolefin resin solution;
  • b) cooling the polyolefin resin solution to precipitate a solid, thereby obtaining a solid-liquid mixture;
  • c) optionally adding an adjuvant to the solid-liquid mixture and mixing; and
  • d) conducting solid-liquid separation and drying to obtain a polyolefin resin powder suitable for selective laser sintering.

The difference between the solubility parameters of the organic solvent and of the polyolefin resin is within 0-20% of the solubility parameter of the polyolefin resin. The polyolefin resin powder obtained according to this method has good antioxidant property, good powder flowability, moderate size, smooth surface, suitable bulk density, and suitable dispersibility and particle size distribution.

The invention provides a cultivation medium, which comprises the following components in percentage by volume: 38 to 42 percent of Mako Hyuga stone, 16 to 21 percent of clinoptilolite, 5 to 7 percent of infusorial earth, 11 to 16 percent of red jade earth, 6 to 9 percent of allophone, 5 to 10 percent of Kiryu sand. In the invention, the Mako Hyuga stone, after high-temperature treatment, has the basic excellent properties of media, such as permeability, water discharge, insusceptibility to decomposition and breakage and high stability; and due to a chemical inertness, the Mako Hyuga stone can prevent the increase of surface adsorbates of the clinoptilolite exposed in the air for an overlong time and can prolong the service life of the clinoptilolite by 3 to 5 years effectively.

Tyre (1) comprising a crown (3), sidewalls (4) continuing the crown from each side, these sidewalls being connected to beads (5) designed to be in contact with a tyre-fitting rim (2), and the tyre having an inside wall (10) defining with the fitting rim (2) an internal cavity (100) to enable the tyre to be inflated. This tyre comprises, on at least part of its inside wall (10) defining the internal cavity (100), a plurality of elongated protuberances (6) forming a dense coating, the tyre being characterized in that these elongated protuberances (6) comprise a plurality of supporting fibres 60 and a plurality of branching fibres (61), said branching fibres being attached to said supporting fibres, and each supporting fibre (60) having two ends, at least one of which is attached to the inside wall (10) of the tyre.

The invention provides polypropylene resin powder for selective laser sintering as well as a preparation method thereof. The method comprises the following steps: at a heating temperature, dissolving polypropylene resin in at least one organic solvent of C5-C9 alkanes, and adding a nucleating agent to obtain a polypropylene resin solution; cooling the obtained polypropylene resin solution to precipitate out solid to obtain a solid-liquid mixture; adding an additive into the obtained solid-liquid mixture, and mixing uniformly; and performing solid-liquid separation and drying the solid to obtain polypropylene resin powder applicable to selective laser sintering, wherein the additive comprises a powder separating agent and/or antioxidant. The polypropylene resin powder prepared by the invention has the advantages of good oxidation resistance and powder fluidity, moderate size, smooth surface, proper bulk density and suitable dispersity and particle size distribution. The invention also provides a selective laser sintering method taking the polypropylene powder prepared by the method as a raw material.

The invention provides a method for preparing polyformaldehyde resin powder for selective laser sintering, which comprises the following steps: (1) dissolving polyformaldehyde resin in at least one organic solvent selected from amide, cyclic ether, ketone and chloralkane at a heating temperature to obtain a polyformaldehyde resin solution; (b) cooling the polyformaldehyde resin solution obtained in the step (a) until solid precipitate is separated out to obtain a solid-liquid mixture; (c) adding an additive into the solid-liquid mixtu.

A preparing method of antibacterial polypropylene resin powder used for selective laser sintering is provided. The method includes a) dissolving polypropylene resin to an alkane organic solvent at a heating temperature to obtain a polypropylene resin solution, b) cooling the polypropylene resin solution prepared in the step a) to allow a solid precipitate to precipitate out, and c) adding auxiliary agents into a solid liquid mixture obtained in the step b), then fully mixing the mixture, and drying the mixture to obtain the power, wherein the auxiliary agents comprise an antibacterial agent, an antioxidant and a powder separating agent. The method is simple and easy to operate. A sintering raw material having excellent processing performance is provided for selective laser sintering, and a novel direction is provided for processing and application of functional polypropylene resin. The invention further provides the antibacterial polypropylene resin powder prepared by the method and a selective laser sintering method adopting the antibacterial polypropylene resin powder as a sintering powder raw material.

The invention discloses a mushroom residue-based artificial soil. The mushroom residue-based artificial soil comprises mushroom residues, fly ash, animal dung, a pH regulator, a buffering agent and a chelate, wherein a mushroom residue, fly ash and animal dung mixture contains 20-60wt% of mushroom residues, 5-40wt% of fly ash and 15-40wt% of animal dung, and every ton of the mushroom residue, fly ash and animal dung mixture contains 0.01-1000g of the pH regulator, 0.01-1000g of the buffering agent and 0.01-500g of the chelate. The mushroom residues have light weight, the unit weights of the fly ash and the animal dung are large, and a ratio of the mushroom residues to the fly ash to the animal dung is controlled to make the unit weight of the artificial soil be similar to the unit weight of manure soil, so plant roots can be well fixed, the water holding permeability of soil is increased, water, fertilizers, air and other environment factors needed in the growth process of the plants are well coordinated, and a large amount of beneficial microorganisms in the mushroom residues increase the diversity of microorganisms in soil. The artificial soil has stable performances, is not affected by batches, seasons or regions, and keeps excellent application effects.

The invention provides a preparation method of a glass fiber reinforced polypropylene resin powder for selective laser sintering. The method includes the steps of: a) at a heating temperature, dissolving polypropylene resin in an alkane organic solvent to obtain a polypropylene resin solution; b) cooling the polypropylene resin solution obtained by step a) to make solid precipitate out; c) adding assistants into the solid-liquid mixture obtained by step b), mixing the substances evenly, and performing drying so as to obtain the powder, wherein the assistants include ultra-short glass fiber, an antioxidant and a powder separant. The method has the characteristics of simple operation and easy operation, not only provides the sintering raw material with excellent processing properties for selective laser sintering, but also provides a new direction for processing and application of functional polypropylene resin. The invention further provides the glass fiber reinforced polypropylene resin powder prepared according to the method and a selective laser sintering method adopting the glass fiber reinforced polypropylene resin powder as the sintering powder raw material.

The invention relates to an olefin polymerization method. The method comprises steps as follows: a hexane solution of triethyl aluminum, a hexane solution of cyclohexyldimethoxymethylsilane and a catalyst are sequentially added to a high-pressure reactor under the protection of nitrogen, the high-pressure reactor is closed, 1.5-8.0 L of hydrogen and liquid olefin are added, the components are heated to 60-80 DEG C to react for 1-2 h, cooled, subjected to pressure release, discharged and dried, and polymers are obtained. According to the olefin polymerization method, a supporter and the catalyst are improved, so that when the catalyst prepared from the supporter is used for polymerization of olefin, especially, polymerization of propylene, activity and hydrogen regulation sensitivity of the catalyst can be improved, particle morphology of obtained polymers is good, bulk density of the polymers can be reduced, and no special-shaped materials are produced basically.

The invention belongs to the technical field of synthesis of pharmaceutic adjuvants, and particularly relates to directly pressed starch and a production method thereof. According to the invention, astarch material and an adhesive solution are mixed and then subjected to extrusion molding, drying and crushing or direct spray drying, so that the effect of producing improved starch capable of beingdirectly pressed into sheets is achieved. The invention has the advantages that the production method is simple, effective, efficient and convenient, the produced starch is good in flowability, relatively small in hygroscopicity and sufficient in adhesive force, the performance is outstanding after the directly pressed sheets are prepared, and the starch is suitable for a powder direct pressing process when being used as a filling agent and a diluent.

The invention provides a camellia mycorrhizal seedling substrate and a use method thereof. The seedling substrate is prepared from vermiculite, peat, coal cinder, mycorrhiza fungi, coco coir and a water-retaining agent; the seedling substrate is divided into two layers, the vermiculite, the peat, the coal cinder and the mycorrhiza fungi are mixed to be uniform to serve as a lower layer substrate body, and the coco coir and the water-retaining agent are mixed to be uniform to serve as an upper layer substrate body. When the substrate is used, the lower layer substrate body is laid first, camellia seedlings are planted in the lower layer substrate body, then the upper layer substrate body is laid, watering is conducted thoroughly, and water is supplemented in time. The substrate is good in physical and chemical property and low in cost, the substrate preparation and use steps are few, the cultivated camellia seedlings are high in survival rate and less in disease and pest damage, plantsgrow strongly, and the requirements of commercial camellia seedlings are met.

The invention provides a preparation method of a polypropylene resin powder for selective laser sintering. The preparation method includes the following steps: a) at a heating temperature, dissolving polypropylene resin in an organic solvent composed of at least one of acetone, butanone, 2-pentanone, 3-pentanone, cyclopentanone, methyl isopropyl ketone, tetrahydrofuran and dioxane to obtain a polypropylene resin solution; and b) decreasing the temperature of the polypropylene resin solution to separate out a solid precipitate. In the method, a proper solvent is firstly selected, and then proper temperature increasing and decreasing methods are designed at certain temperature and under certain pressure, thereby preparing the polypropylene resin powder raw material which is very suitable for the selective laser sintering in shape, characters and the like. The method is free of other additives and can be used for producing the polypropylene resin powder, which is moderate in size, has a smooth surface, is good in dispersibility, is small in particle size distribution and has proper bulk density, for the selective laser sintering.

The invention provides a polyethylene resin powder used for selective laser sintering and a preparation method and an application thereof. The method comprises the following steps: under heating temperature, dissolving polyethylene in at least one of organic solvents of C5-C9 alkanes to obtain a polyethylene resin solution; precipitating the solid precipitate to obtain a solid-liquid mixture; adding an auxiliary agent in the obtained solid-liquid mixture, removing the solvent, and drying the material to obtain the polyethylene resin powder used for laser sintering; wherein the auxiliary agent comprises an antioxidant and/or a powder parting agent. The polyethylen resin powder has the advantages of appropriate size, smooth surface, good dispersibility, small size distribution, good oxidation resistance and flowability, and is suitable for various molded products used for selective laser sintering. The invention provides the selective laser sintering method by taking polyethylen resin powder as a raw material.