73results about How to "Good physical properties" patented technology

The invention discloses a production method of distiller's grain fermentation liquid fertilizer specially applied to roxburgh rose. The distiller's grain fermentation liquid fertilizer is prepared bythe step of evenly mixing 50 to 80 parts of distiller's grain fermentation extracting solution, 0.5 to 1 part of microelement, 5 to 10 parts of seaweed meal, 5 to 10 parts of natural active organism,2 to 5 parts of potassium bicarbonate, 2 to 5 parts of natural active organism and 2 to 5 parts of natural surface active agent. A preparation method of the distiller's grain fermentation extracting solution comprises the steps: evenly stirring 50 to 80 parts of distiller's grain, 50 to 150 parts of rice washing water, 1 to 2 parts of EM microflora fermentation liquid and 0.5 to 1 part of sugar, performing composting fermentation at the room temperature to obtain a distiller's grain fermentation material, stirring and extracting through a sodium carbonate water solution, filtering and performing evaporation and condensation on obtained filtrate until the density is 1.1 to 1.2 to obtain distiller's grain fermentation extracting solution. The distiller's grain fermentation liquid fertilizerdisclosed by the invention has a good use effect, meanwhile can effectively prevent pest and disease damage to the roxburgh rose and is high-efficiency environment-friendly liquid fertilizer.

The utility model discloses a prefabricated diaphragm wall type assembled subway entrance and exit structure which comprises side wall structures, a prefabricated top plate and a prefabricated bottom plate are arranged between the side wall structures of the entrance and exit, the prefabricated top plate and the prefabricated bottom plate are both connected with the side wall structures through ultrahigh concrete, and the side wall structures are formed by integrating an enclosure structure and a main body structure. The side wall structure comprises prefabricated underground diaphragm walls, and underground diaphragm wall inter-amplitude connecting assemblies are arranged between the adjacent prefabricated underground diaphragm walls. The foundation pit support structure, the waterproof curtain and the side wall of the main body structure are integrated, so that working hours and manufacturing cost are saved. According to the utility model, the connection scheme of the waterstop strip bags, the C / T inter-width connectors and the UHPC concrete wet joints is adopted between the prefabricated underground diaphragm walls, so that the waterproof and guiding effects are achieved. According to the utility model, the longitudinal tensioning connection scheme of the inter-width concave-convex tenons, the elastic sealing gaskets and the prestressed steel bars is adopted between the prefabricated plate widths, so that not only can shearing force be effectively transmitted, but also a water stopping effect can be achieved.

The invention discloses a bimetallic asymmetric reduction Schiff base catalyst for synthesizing ethylene carbonate and a preparation method of the bimetallic asymmetric reduction Schiff base catalyst. According to the catalyst, a diamine compound is subjected to selective single-side protection, the imine reduction position is controlled, and a bimetallic active center is introduced; the controllable synthesis of a product for reducing the outer side imine and a product for reducing the inner side imine is realized; the obtained product is recrystallized to obtain a monoimine-monoamine type ligand with a clear asymmetric structure, the monoimine-monoamine type ligand and metal salt form a bimetallic catalyst, and the catalyst generates a synergistic effect through double active sites and shows high catalytic activity and excellent product selectivity.

The invention belongs to the technical field of dibromohydantoin production, and particularly provides a dibromohydantoin synthesis method which comprises the following steps: S1, preparing a raw material aqueous solution, namely respectively mixing dimethyl hydantoin, sodium bromide and liquid caustic soda NaOH with deionized water to form a dimethyl hydantoin aqueous solution, a sodium bromide aqueous solution and a liquid caustic soda NaOH aqueous solution; s2, premixing the raw material aqueous solution, namely mixing the aqueous solution of dimethyl hydantoin, sodium bromide and caustic soda liquid NaOH prepared in S1 to obtain a premix; s3, electrochemical in-situ bromination reaction: introducing the premix into a micro-channel reactor provided with an electrolysis electrode, and applying current to the premix to obtain a dibromohydantoin initial solution; and S4, crystallizing, separating and drying the product, carrying out cooling crystallization through a three-stage stepped cooling method to obtain a dibromohydantoin crystal, carrying out centrifugal separation to obtain a dibromohydantoin wet product, and then drying to obtain a dibromohydantoin finished product. The method can improve the generation stability and the product quality of the dibromohydantoin.

This invention provides a high-hygroscopic, water-free composite gel-type calcium and magnesium salt tablet and its preparation method, which is made from the following raw materials in parts by weight: 45-70 parts calcium and magnesium salt, 15-25 parts gum arabic, 3-15 parts mica powder, 2-12 parts polyethylene oxide, 0.5-2 parts sodium nitrite, and 2-30 parts gelatin. This tablet exhibits high hygroscopicity and excellent physical properties.

This invention belongs to the field of composite material technology, specifically disclosing a high-dielectric-constant, low-dielectric-loss polyphenylene sulfide composite material, its preparation method, and its applications. The composite material comprises the following components in parts by weight: 100 parts of polyphenylene sulfide matrix, 10-60 parts of high-dielectric-constant nanofiller, 0.5-8 parts of metal nanoparticles, and 0.5-5 parts of surface modifier. This invention utilizes the aforementioned high-dielectric-constant, low-dielectric-loss polyphenylene sulfide composite material, its preparation method, and its applications. The composite material exhibits a high dielectric constant and achieves low dielectric loss. It also enhances its mechanical strength and toughness, enabling the composite material to maintain its electronic properties while possessing excellent physical properties.

The invention discloses a grain size control method of a reclaimed material hard alloy, which comprises the following steps: S1, component analysis of the reclaimed material: the proportion of oversize products is 0-8% when the reclaimed material passes through a 110-120-mesh sieve; s2, burdening according to the use ratio of the reclaimed material being 50%-99% and the ball-to-material ratio being (2-5): 1, carrying out a ball milling test, preparing a sample, and detecting the coercive force; s3, the raw material ratio and the ball-to-material ratio are equal to those in the step S2, and a mixture is obtained through batching and ball milling; s4, the mixture is subjected to compression molding, and a pressed blank is obtained; and S5, the pressed blank is subjected to pressure sintering, and the reworked material hard alloy with the grain size being 2.0-3.0 microns is obtained. The method is simple and easy to implement, the grain size of the regenerated material can be accurately judged, the integrity and uniformity of alloy grains can be ensured, the prepared regenerated hard alloy has good physical performance, the performance very close to that of a raw material alloy can be achieved, and the application field of the regenerated hard alloy is widened.

The invention relates to a fluoride-free flame-retardant polyester reinforced resin composition as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The resin composition comprises the following components in parts by weight: 15-55 parts of PBT resin; 0 to 20 parts of PET resin; 10 to 50 parts of glass fiber; 10 to 15 parts of brominated aromatic flame retardant; 1-3 parts of a compatilizer; 1-5 parts of a toughening agent; 1.5 to 3.0 parts of an antimony flame retardant synergist; 2-5 parts of a high carbon residue charring agent; 0.2 to 0.5 part of an antioxidant; and 0.5 to 1.0 part of a lubricant. Compared with the prior art, the fluorine-free flame-retardant polyester reinforced resin prepared by the invention not only has excellent mechanical properties and good processability, but also has lower cost and wide application scenarios.

This utility model belongs to the technical field of acid and alkali resistant EPDM rubber processing equipment, specifically an acid and alkali resistant EPDM rubber tableting machine. It includes a support assembly and a rubber block. One side of the support assembly is equipped with an intermittent conveying assembly for intermittently conveying the rubber block, and another side of the support assembly is equipped with a tableting assembly for squeezing out excess moisture from the rubber block. The side of the tableting assembly away from the rubber block is equipped with a storage frame for storing the compressed rubber sheets. This utility model achieves intermittent conveying of the rubber block by setting an intermittent conveying assembly. This intermittent conveying method allows the rubber block to enter the tableting stage in an orderly manner according to a preset time interval, avoiding problems such as rubber block accumulation and overlap that may occur with continuous conveying. This ensures that each piece of rubber is fully and uniformly processed, improving the consistency and stability of the tableting process.

The invention provides a preparation method of an anti-yellowing thermoplastic polyurethane material, which comprises the following steps: aliphatic thermoplastic polyurethane particles are provided, and polymerization raw materials of the particles comprise hexamethylene diisocyanate, polyether polyol and a chain extender; placing the particles in an environment with a temperature of 80-90 DEG C, and heating for 12-24 hours to obtain pre-crosslinked particles with a gel content of 5-15 wt%; the pre-crosslinked particles are placed in a high-pressure closed environment, supercritical fluid is introduced, and the temperature of 113 DEG C to 117 DEG C and the pressure of 20 MPa to 24 MPa are maintained for 60 minutes to 90 minutes; reducing the temperature of the high-pressure closed environment from 113 DEG C to 117 DEG C to 100 DEG C to 105 DEG C under the condition that the pressure of the high-pressure closed environment is kept at 20 MPa to 24 MPa, and keeping the temperature of 100 DEG C to 105 DEG C for 10 minutes to 15 minutes; and releasing the pressure of the high-pressure closed environment to 0.09 MPa to 0.11 MPa at the temperature of 100 DEG C to 105 DEG C. According to the thermoplastic polyurethane material prepared by the preparation method, the yellowing problem is solved, and the thermoplastic polyurethane material has good structural stability and dimensional stability.

The present application relates to a solid form of an indole compound, a preparation method therefor and a use thereof. Specifically, the present application relates to a solid form of a compound of Formula (1), a method of preparing same, a pharmaceutical composition comprising same, and a use thereof in treating a disease.

This invention relates to a GaAs-based flip-chip Mini LED and its fabrication method. The chip comprises, from bottom to top, a transparent substrate, a bonding layer, a P-current spreading layer, and a P-ohm layer. A mesa is disposed on the P-ohm layer. The mesa, from bottom to top, comprises a P-waveguide layer, a light-emitting layer, an N-waveguide layer, an N-current spreading layer, an N-buffer layer, and an N-ohm layer. A P-electrode is disposed on the P-ohm layer below the mesa; an N-electrode is disposed on the N-ohm layer above the mesa. Electrode pads are disposed directly above both the P-electrode and the N-electrode. By setting electrode pads, the soldering required in packaging production is combined with the electrode structure, eliminating the need for solder paste application on the substrate, thus achieving chip-substrate interconnection and facilitating modular production of the packaged chip. This effectively improves the problems of weak chip-substrate bonding strength, high coefficient of thermal expansion, cumbersome manufacturing, and high production costs in chip packaging.

The invention discloses a preparation method of pure mycelia, the pure mycelia and application. The method comprises the following steps: S1, preparing a mycelia solid culture medium; S2, preparing a mycelia paste culture medium; S3, forming the mycelia paste culture medium and fermenting mycelia; according to the method, a continuous, compact and thickness-controllable pure mycelium layer is formed on the surface of a pasty fluid culture medium in a manner of combining solid culture and pasty fluid culture, and a mycelium biological material with excellent physical properties can be obtained without adopting a bracket or an adhesive material. The preparation method has the advantages of simple steps, no need of a complex sterilization mode, short preparation period, low cost, capability of forming large-area pure mycelia at one time, suitability for large-scale industrial production, mild preparation conditions, greenness and environmental protection. The prepared pure mycelium can be applied to mycelium leather or mycelium meat, does not need an adhesive when being used for the mycelium leather, is excellent in material physical performance, does not need chemical or plant adhesives when being used for the mycelium meat, and is good in taste and high in nutrition.

The application relates to the technical field of court surface layers, in particular to a high-weather-resistance composite silicon PU court surface layer and a construction method thereof. The high-weather-resistance composite silicon PU court surface layer comprises, from bottom to top, a waterproof bottom coating layer, a silicon PU material layer, a winter polyurea reinforcing layer and a water-based surface paint layer. The waterproof bottom coating is used as a bottom sealing material, the silicon PU material is used as a bottom layer, the winter polyurea material is used as a reinforcing layer, and the water-based surface paint is used as a color layer, so that a novel court surface layer with good weather resistance, high rebound rate, excellent performance and super-long service life is obtained; the service life of the novel court surface layer is more than 10 years, excellent physical properties are maintained, and defects such as low service life, poor rebound, poor impact absorption, poor wear resistance, easy pulverization, high cost and complex construction of ordinary courts are effectively overcome, and the knee joint safety and body health of athletes are fully protected.

The invention discloses a phenolic aldehyde board for biomass circuit board drilling and a preparation method and application thereof.The preparation method of the phenolic aldehyde board for biomass circuit board drilling comprises the steps that cashew nut shell oil, phenol and an acid catalyst are mixed, then sodium hydroxide, paraformaldehyde and formaldehyde are added for a reaction, and a cashew nut shell oil modified phenolic aldehyde solution is prepared; diluting and impregnating wood pulp paper to prepare a pre-cured sheet; and finally, carrying out hot pressing to form the phenolic aldehyde plate. According to the biomass phenolic resin, the preparation cost of the phenolic resin can be remarkably reduced, environmental protection benefits are achieved, and the comprehensive performance of the biomass phenolic resin can be kept equivalent to that of pure phenolic resin while the permeability of a glue solution to wood pulp paper and the gluing uniformity are guaranteed.

The application discloses a kind of organic silicon synthetic leather and its preparation process, belong to the field of organic silicon synthetic leather.The synthetic leather includes base cloth, which is provided with bottom glue layer, and the bottom glue layer is provided with surface glue layer;Wherein surface glue layer and bottom glue layer are all obtained by vacuum mixing of vinyl silicone oil, modified hydrophobic white carbon black, phenyl vinyl silicone resin, hydrogen-containing silicone oil, inhibitor and catalyst.Specific preparation is first coated to surface glue layer on release paper, heated and cured, then the bottom glue layer is coated on the surface of surface glue layer, the base cloth is laminated with bottom glue layer, heated and cured, and the release paper is removed, to obtain organic silicon leather.The organic silicon synthetic leather has the advantages of wear resistance, folding resistance, tear resistance and the like.

The invention discloses a natural polymer-based slow-release oxygen microcapsule for repairing sediments as well as a preparation method and application of the natural polymer-based slow-release oxygen microcapsule. The slow-release oxygen microcapsule prepared by a micro-fluidic method comprises an oxygen release core containing calcium peroxide, sodium alginate and carboxymethyl chitosan are used as natural polymer shell materials, and the size of the slow-release oxygen microcapsule is 0.1-2 mm. The sodium alginate is subjected to ionic crosslinking between carboxyl and calcium ions to form an eggshell-shaped initial gel network; further, carboxymethyl chitosan is subjected to a Schiff base reaction through glutaraldehyde, and a second stable network is constructed; the two polymer chains form a composite shell layer with a stable structure and adjustable permeability through the synergistic effect of physical entanglement and double crosslinking points. The structure can effectively block water molecule permeation and oxygen diffusion, and long-acting release of oxygen is achieved.

The invention provides pseudo-boehmite with high specific surface area and large pore volume, a preparation method thereof and a hydrogenation catalyst.The preparation method comprises the steps that an excessive NaOH solution and associated aluminum ore are mixed and boiled, aluminum hydroxide is leached out, and a sodium metaaluminate solution containing impurities is obtained; mixing the sodium metaaluminate solution containing the impurities with a precipitant to precipitate the impurities so as to obtain a sodium metaaluminate purified solution; mixing sulfuric acid and the sodium metaaluminate purified liquid, and reacting to obtain turbid liquid containing pseudo-boehmite; mixing the turbid liquid containing the pseudo-boehmite with hydroxyl carboxylate to enable the pseudo-boehmite to be electronegative, so as to obtain an electronegative pseudo-boehmite turbid liquid; and mixing the electropositive aluminum ions and the electronegative pseudo-boehmite suspension to obtain the pseudo-boehmite with high specific surface area and large pore volume. The low-cost hydrogenation catalyst prepared from the pseudo-boehmite with high specific surface area and large pore volume has the characteristics of high specific surface area and large pore volume, has higher catalytic activity, contains more impurities, and has stronger market competitiveness.

The application discloses a deep-groove polysilicon etching solution, which comprises an oxidizing agent, an inorganic acid, a pH regulator and a surfactant. The deep-groove polysilicon etching solution can efficiently etch polysilicon while ensuring the uniformity and smoothness of the etching surface, and can maximize the consistency of the etching of the upper and lower grooves and the smoothness of the surface. In the etching process, the inorganic acid ensures that the etching solution system is in an acidic environment, and the polysilicon is etched; the pH regulator avoids the large fluctuation of the pH of the etching solution, thereby ensuring the stability of the polysilicon etching process; and the surfactant reduces the surface tension of the etching solution, improves the wettability of the etching solution, ensures the consistency of the etching rate of the upper and lower grooves, and ensures the consistency of the groove aperture.

This invention discloses a method for preparing cubic nano-calcium carbonate based on monosaccharide regulation. Using monosaccharides as crystal guiding agents, the resulting cubic nano-calcium carbonate exhibits a cubic structure with an average particle size of 81-115 nm. The monosaccharide is either glucose or fructose. The preparation method includes the following steps: 1. Preparation of calcium oxide; 2. Preparation of monosaccharide-nano-calcium carbonate. The amount of monosaccharide added is 0.8-1.2 wt.% of the calcium oxide mass; the calcium oxide yield is 65-75%. The resulting nano-calcium carbonate has a whiteness value of 90.6-97.3 wb and an oil absorption value of 65.3-89.6 g DOP / 100 g CaCO3.

The utility model relates to drinking water level rubber forming processing technical field, concretely discloses a kind of rubber forming processing mixing device, it include: mixing tank, the inside of mixing tank is provided with the first stirring mechanism of mixed stirring rubber raw material, the top of first stirring mechanism is provided with the second stirring mechanism of lifting stirring rubber raw material, this rubber forming processing mixing device, the utility model at least has following beneficial effect: by the first stirring mechanism and second stirring mechanism being set, first stirring mechanism can be used to make first stirring rod and mixing tank reverse rotation to rubber raw material preliminary mixing stirring, and simultaneously drive second stirring rod to push rubber raw material in stirring by magnetic force homopolar repulsion, realize the work of lifting stirring, and then the cooperation of above two mechanisms can be realized to rubber raw material carries out multiple different mixing stirring mode, so as to ensure the uniformity of mixing between various agent materials, and the quality of mixing is guaranteed.

This invention belongs to the field of high-value utilization and processing of waste wood fiber raw material, coffee grounds, and discloses a method for preparing a coffee grounds regenerated membrane and its application. The method for preparing the coffee grounds regenerated membrane of this invention includes the following steps: degreasing and drying the coffee grounds; dissolving the degreased coffee grounds; casting the coffee grounds solution into a mold and cooling it; placing the coffee grounds sol in a metal ion solution for coagulation and regeneration; and hot-pressing and drying the coffee grounds regenerated gel to obtain the coffee grounds regenerated membrane. This invention uses a metal ion solution as the regeneration coagulation bath. The strong metal coordination bonds formed between the metal ions and the oxygen-containing functional groups of the coffee grounds molecules, along with the antibacterial properties of the metal ions themselves, endow the coffee grounds regenerated membrane with excellent physical and antibacterial properties.

This invention relates to the field of preparation method technology and discloses a method for preparing a low-density nylon foam material. The method includes selecting nylon resin as the matrix material, wherein the nylon resin is a blend of PA6 and amorphous nylon PA610 in a specific ratio, wherein the mass ratio of PA6 to PA610 is 60:40 to 80:20, and the melt strength of the nylon resin is greater than or equal to 18 Pa·s; introducing a composite foaming agent, wherein the composite foaming agent is a combination of a chemical foaming agent and a physical foaming agent; and adding a nucleating agent, wherein the nucleating agent is nano-sized silica, nano-clay, talc, or a combination thereof, wherein the mass content of nano-silica is 0.5% to 2.0%. This invention can maintain stable dimensions and mechanical properties in humid environments and has a uniform and stable cell structure.

The invention discloses a terbium gallium garnet crystal and a growth method thereof, and relates to the technical field of crystal preparation. The growth method of the terbium gallium garnet crystal comprises the following steps: respectively weighing terbium oxide and gallium oxide according to a molar ratio of 1: (2-2.4), and mixing to form a powdery mixture; heating the powdery mixture for pre-synthesis to obtain a blocky mixture; and taking the blocky mixture as a substrate, taking terbium fluoride and / or gallium fluoride as an inhibitor, and putting the blocky mixture and the inhibitor into a pulling furnace for pulling growth to generate the terbium gallium garnet crystal. According to the terbium gallium garnet crystal and the growth method thereof, the crystal quality of the terbium gallium garnet crystal can be improved.

This invention relates to the field of powder coatings. To address the problem of poor bonding stability between metallic pigments and base powder in existing technologies, this invention provides a high-stability powder coating and its preparation method, comprising the following steps: S100, mixing resin base material, filler, and additives, and then obtaining base powder through a melt extrusion process and a granulation process; S200, the base powder and metallic pigment are bonded together to obtain a high-stability powder coating; the resin base material includes: polyester resin, epoxy resin, and curing agent; the additives include: amide-modified polyethylene wax, wherein the amide-modified polyethylene wax accounts for 1wt%-1.5wt% of the resin base material. This invention, by adding amide-modified polyethylene wax to the base powder, utilizes the poor compatibility between the amide-modified polyethylene wax and the resin base material, combined with the shear force of melt extrusion, to allow the amide-modified polyethylene wax to migrate to the surface of the base powder, reducing agglomeration between resin base materials, thereby increasing the temperature of the bonding process to a certain extent and increasing the stability of the metallic pigment.

A quantum dot ink composition, a method of preparing the same, and a cured film, a color filter and a display device including the same are disclosed. The quantum dot ink composition includes a ligand compound particularly suitable for AIGS quantum dots, thereby further improving the optical properties and stability of the quantum dots. Furthermore, the method for preparing the quantum dot ink composition allows a ligand compound to be substituted on the surface of the quantum dot with good efficiency, and the substituted ligand compound can be more strongly bonded to the surface of the quantum dot to prepare the quantum dot ink composition having good physical properties, thus, a high-quality display device having further improved optical properties is provided.

The invention relates to oxidized paraffin, a preparation method thereof and application of the oxidized paraffin in preparation of emulsified wax, and belongs to the technical field of paraffin modification. The specific catalyst is used for catalyzing oxidation of the paraffin, the acid value and the saponification value of the prepared oxidized paraffin are higher, the oxidized paraffin is used as a paraffin raw material, the oxidized paraffin has more oxygen-containing groups and is easier to emulsify, and the emulsified paraffin obtained after emulsification is stable in property, smaller in particle size, better in dispersing performance and excellent in physical performance; wide application prospects are realized.

This invention discloses a combined electro-discharge machining (EDM) method for long, narrow slit structures, specifically relating to the field of EDM technology. The steps are as follows: The workpiece is mounted on the EDM electrode wire; the EDM electrode wire moves in the XY plane; the machined workpiece is then aligned with the electrolytic machining wire electrode; the power supply and electrolytic control system are turned on for secondary machining; the electrolytic machining wire electrode moves along a predetermined trajectory in the XY plane; after secondary machining, the power supply is disconnected, the electrolyte circulation system is shut off, the electrolytic machining wire electrode and workpiece are removed, and both are cleaned, thus completing the machining process. This invention solves the problem of existing machining methods struggling to achieve high-quality machining of ultra-thin sheet-like long, narrow slit structures, improving the machining quality and efficiency of such structures.

The invention discloses a three-dimensional composite interplanting method for interplanting poria cocos and peanuts. The three-dimensional composite interplanting method comprises the following steps: S1, soil preparation; s2, applying a composite soil conditioner and building furrows; s3, putting the poria cocos into a cellar; s4, peanut sowing; s5, field management in the symbiotic period; s6, harvesting in a staggered manner. According to the method, the poria cocos is planted underground, the peanuts are planted on the ground, after the peanuts are harvested, the ground surface is covered with peanut straw, the poria cocos is shaded, the physical properties of soil are improved by returning the peanut straw to the field, two kinds of medicines and grains are planted in one field through poria cocos and peanut interplanting, and the land utilization rate is increased; meanwhile, the composite soil conditioner prepared by a specific method is applied, long-acting and synergistic biological stimulation is provided for the two crops, the soil permeability is improved, and special pretreatment is performed on pine sections, so that the poria cocos inoculation rate, stress resistance and yield of poria cocos strains are remarkably improved, the soil micro-ecological environment is improved, the soil permeability and enzyme activity are improved, and the yield of the poria cocos strains is increased. And double improvement of economic benefits and ecological benefits is realized.

Provided is a sealant composition that can ensure good sealing properties while suppressing a flow of a sealant during travel and that can provide such performance in a well-balanced, compatible manner. As a sealant composition constituting a sealant layer (10) disposed in an inner surface of a pneumatic tire, a sealant composition in which a proportion (A) of toluene insoluble occupying the sealant composition is from 30 mass% to 60 mass% is used, or a sealant composition in which a ratio (d1 / d2) of measured specific gravity (d1) of the sealant composition measured by an underwater replacement method to calculated specific gravity (d2) of the sealant composition calculated from specific gravity and a blended amount of each raw material in the sealant composition is from 0.7 to 0.9 is used.