38results about How to "Fill pores" patented technology

The invention provides a vacuum heat insulating plate and preparation and application of the vacuum heat insulating plate. The vacuum heat insulating plate comprises a heat insulating core material and a film material coating the heat insulating core material. The heat insulating core material comprises nanoscale silicon dioxide and is formed by mixing the nanoscale silicon dioxide with multi-scale expanded perlites and chopped fibers in the weight ratio of 10:5-30:1. The specific surface area of the nanoscale silicon dioxide is 100-400m<2> / g. The incompact stacking density of the multi-size expanded perlites is lower than 350kg / m<3>. The length of the chopped fibers is less than 10mm, and the diameter is less than 20mum. The vacuum heat insulating plate is obtained by uniformly mixing the raw materials, putting the uniformly mixed raw materials into a mold for pressing and molding, taking out the molded core materials, drying the molded core materials to constant weight, putting the core materials into a bag which is prepared from the film material in advance, vacuumizing till the vacuum degree is less than 0.1Pa, and then performing hot sealing. The vacuum heat insulating plate is high in strength and good in heat insulating effect. In this way, the vacuum heat insulating plate is applied to the heat insulation of building walls.

The invention discloses a SrB4O7 seed crystal-containing electrical porcelain and a preparation method thereof. The SrB4O7 seed crystal-containing electrical porcelain comprises 10-20wt% of SiO2, 10-25wt% of Al2O3, 10-20wt% of Fe2O3, 1-5wt% of TiO2, 2-10wt% of CaO, 0-3wt% of MgO, 5-15wt% of K2O, 3-8wt% of Na2O, and 2-15wt% of SrB4O7 seed crystal. The addition of the SrB4O7 seed crystal promotes the sintering process of an electrical porcelain, improves the compactness of the electrical porcelain, and substantially enhances the rupture strength of the electrical porcelain; and the addition of the SrB4O7 seed crystal also can effectively promote crystallization of a SrAl2Si2O8 phase and a mullite phase in order to substantially improve the mechanical strength of the electrical porcelain. The method has the advantages of simple and easily available raw materials, stable, mature, simple and feasible process, low cost, and meeting of practical and industrial conditions.

The invention provides high insulating property dense polymer concrete as well as a preparation method and application thereof. The concrete comprises the following components in parts by mass: 120 parts of cement, 10-50 parts of emulsion, 30-60 parts of water, 10-30 parts of wollastonite, 5-30 parts of mica, 10-20 parts of silica, 0.1 part of a water reducing agent and 0.01 part of an antifoaming agent. The concrete is processed by the steps of stirring in vacuum, molding, curing, drying and the like. The concrete can be applied to electrical insulating pipelines, brackets and transformer bases. The polymer serves as an electrical insulating material, and the prepared concrete has the advantages of high insulating property, compactness, strength and durability and is simple in preparation process, low in cost, convenient in construction and suitable for large-scale industrial production.

The invention discloses a thin flame-retardant medium-density fiberboard which comprises the following raw materials: a fiber raw material, urea resin accounting for 8-16 weight percent of the fiber raw material, a flame retardant accounting for 8-20 weight percent of the fiber raw material, ammonia chloride accounting for 0.12-0.24 weight percent of the fiber raw material and emulsion paraffin accounting for 0.6-1.2 weight percent of the fiber raw material, wherein the flame retardant comprises a solid flame retardant and a liquid flame retardant. The thin flame-retardant medium-density fiberboard disclosed by the invention adopts the two types of flame retardants, namely the solid flame retardant and the liquid flame retardant, and can solve the problem that the structure is simple due to the addition of the single type of flame retardant, so that the mechanical property is reduced; by the collaborative use of the solid flame retardant and the liquid flame retardant, pores inside the fiberboard can be effectively filled; the liquid flame retardant can form a good connecting link between two solid matters; meanwhile, the liquid flame retardant has a certain thermal plasticity, so that the adverse effect of the flame-retardant on the mechanical properties of the board can be reduced to a certain extent.

The invention discloses compound amorphous seed added electrical porcelain and a preparation method thereof. The compound amorphous seed added electrical porcelain is prepared from the following raw materials in weight percent: 10-20% of SiO2, 10-25% of Al2O3, 10-20% of Fe2O3, 1-5% of TiO2, 2-10% of CaO, 0-3% of MgO, 5-15% of K2O, 3-8% of Na2O, and 5-20% of compound amorphous seeds. According to the compound amorphous seed added electrical porcelain and the preparation method thereof disclosed by the invention, the compound amorphous seeds (CaB2O4 amorphous seed and CaB4O7 amorphous seed) are added, so that the softening characteristic of the amorphous seeds can be exerted, and the sintering process of the electrical porcelain can be promoted; in the temperature raising process, the compound amorphous seeds can be converted into compound seed crystals (CaB2O4 seed crystal and CaB4O7 seed crystal), and the seed crystals are molten to form a liquid phase, so that the sintering process of the electrical porcelain can be further promoted, the density of the electric porcelain can be improved, and the breaking strength of the electrical porcelain is obviously enhanced; in addition, the addition of the compound amorphous seeds can effectively facilitate crystallization of mullite phase, and furthermore the mechanical strength of the electrical porcelain is obviously improved. The preparation method disclosed by the invention is simple and accessible in raw materials, stable and mature in process, and capable of meeting the requirements of practicability and industrialization.

The invention discloses a sulfate-resistant concrete, which belongs to the technical field of concrete. The main points of the technical scheme are, in parts by weight, 260-330 parts of cement, 160-180 parts of water, 60-100 parts of fly ash, and 90 parts of mineral powder. ‑120 parts, 720‑870 parts of fine aggregate, 900‑1200 parts of coarse aggregate, 7‑11 parts of calcined hydrotalcite powder, 1‑2 parts of sodium benzoate, 1‑2 parts of barium nitrate, 10‑20 parts of nano silicon dioxide Parts, 7‑13 parts of polycarboxylate superplasticizer, calcined hydrotalcite powder is obtained by calcining hydrotalcite at 500°C for 2 hours, to improve the sulfate corrosion resistance of concrete.