42results about How to "Not easy to remove powder" patented technology

The invention discloses a 3D printing weather-resistant nylon powder composite material and a preparation method thereof. The 3D printing weather-resistant nylon powder composite material is characterized by being prepared from the following components in percentage by mass: 97-99.4wt% of nylon, 0.1-0.5wt% of a hindered amine light stabilizer, 0.1-0.5wt% of an ultraviolet light absorber, 0.1-0.5wt% of a hindered phenol antioxidant, 0.2-1.0wt% of a phosphite ester antioxidant and 0.1-0.5wt% of other additives, wherein the other additives comprise one or combination of multiple components of a dispersing agent, a nucleating agent and a lubricant. With the combination of the hindered amine light stabilizer, the ultraviolet light absorber, the hindered phenol antioxidant and the phosphite ester antioxidant, the 3D printing weather-resistant nylon powder composite material prepared through spray-drying is excellent in weather resistance and small in mechanical property change before and after being modified, can be recycled and reused for multiple times, is narrow in spherical granule distribution, good in flowing property, free of layering or powder dropping, and moreover is high in preparation efficiency, small in energy consumption and simple and easy to process.

The invention discloses a palladium alumina for production of hydrogen peroxide by an anthraquinone process. The catalyst comprises gamma-Al2O3 as the carrier, the content of which is over 97wt%; and metal palladium as the main active component, the loading of which is 0.1wt%-0.5wt% and the dipping thickness of which is from 10 micrometers to 100 micrometers. The invention also discloses a preparation method of the catalyst, and the method consists of: roasting aluminum hydroxide, mixing the roasted aluminum hydroxide with pseudoboehmite, then adding a pore-expanding agent for molding, conducting surface treatment so as to obtain a catalyst carrier, then performing pre-spraying on the carrier with a locating agent, carrying out drying, and then putting the carrier into a chloropalladate solution for dipping. With appropriate specific surface area, pore volume and pore size distribution, the palladium catalyst provided in the invention is difficult to shed and fragment. In actual production of hydrogen peroxide by an anthraquinone process, the catalyst shows excellent balance between activity and selectivity, as well as good service life and regeneration cycle.

The invention relates to an ozonolysis catalyst and a preparing method and application thereof. The method comprises the steps of mixing a forming carrier with a manganese source solution, after fullwetting, conducing drying, then mixing the mixture with additive, conducting a reaction at constant temperature, after the reaction is completed, obtaining a regular carrier covered with a manganese precursor, and after baking, obtaining a catalyst product, wherein when manganese in a manganese source is at +7 price, the additive is reductant, and when manganese in the manganese source is at +2 price, the additive is oxidizing agent. The catalyst preparing process and the forming process are integrated, on the basis of the forming carrier, efficient manganese-based ozone catalyst is subjectedto in-situ growth on the outer surface of the forming carrier, the catalyst is stably combined with the carrier, the surface of the catalyst is stable, powder does not easily fall off, the particle size is adjustable, the appearance is formed, the ozonolysis capability is also efficient, the ozonolysis catalyst conveniently fills all air purifiers or fresh air system modules, production of an airpurification module can be accelerated, and the application prospect is good.

The invention discloses a low-warpage nylon powder composite material for 3D printing and a preparation method thereof. The low-warpage nylon powder composite material is characterized by consisting of the following raw materials in percentage by weight: 66-88.6% of nylon, 10-30% of micron-order inorganic filler, 1-2% of coupling agent, 0.1-0.5% of hindered phenol antioxidant, 0.2-1.0% of phosphite antioxidant and 0.1-0.5% of other aids, wherein the other aids refer to one or a combination of more of a dispersing agent, a nucleating agent and a lubricating agent. In the invention, by combining the micron-order inorganic filler, coupling agent, hindered phenol antioxidant and phosphite antioxidant, the low-warpage nylon powder composite material for 3D printing, prepared by spray drying, has excellent warpage resistance and good bonding property; the distribution of spherical particles is narrow, the fluidity is good, and the problem of layered powder drop is avoided; and moreover, the preparation efficiency is high, the energy consumption is low, and the material is simple and easy to process.

The invention relates to a preparation method of a high-heat-resistance vinylidene fluoride polymer mixed coating diaphragm, the high-heat-resistance vinylidene fluoride polymer mixed coating diaphragm prepared by the method and a lithium battery comprising the high-heat-resistance vinylidene fluoride polymer mixed coating diaphragm. The prepared high-heat-resistance vinylidene fluoride polymer mixed coating diaphragm has good heat resistance and air permeability and is formed by one-time coating with simple process. The vinylidene fluoride polymer improves the adhesion between the coating andthe diaphragm and between the coating and the pole pieces, increases the liquid storage capacity of the electrolyte and improves the cycle performance of the lithium battery. The heat-resistant additive forms a heat-resistant network layer with ceramics to improve the heat shrinkage performance of the diaphragm.

The invention discloses a lead-free glass powder used for solar cell aluminum paste. The lead-free glass powder is characterized by mainly comprising the following components by weight percent: 8-20% of SiO2, 2-8% of Al2O3, 10-15% of B2O3, 0-2% of P2O5 or V2O5 0.1-1.5% of BaCO3, and 60-70% of a zinc compound and a bismuth compound. The glass powder disclosed by the invention can facilitate the sintering of electric conduction aluminite powder, is beneficial to the formation of a BSF (Back Surface Field), reduces the ohmic contact and increases open-circuit voltage.

The invention relates to a novel emulsion paint which comprises the following components in percentage by weight: 8.5% of ultramarine, 0.2% of cellulose, 0.07% of humidizer, 0.6% of dispersing agent, 4.2% of titanium white, 17.7% of silicon dioxide superfine powder, 5.7% of kaolin, 7.1% of calcium carbonate light, 7.1% of sierozem, 2.8% of talcum powder, 14.2% of poval, 14.2% of high polymer emulsion and 17.63% of water. The novel emulsion paint has the advantages of ageing resistance, high strength, wet rub resistance, flat and smooth surface and the like, and has less possibility of shedding; after the novel emulsion paint is used for a long term, no splitting phenomenon occurs; and due to high density, the novel emulsion paint has better stain resistance.

The invention provides a polyvinyl alcohol graft copolymer which comprises a polyvinyl alcohol main chain, and a branched chain of the polyvinyl alcohol graft copolymer comprises a structural unit derived from the following monomers: (a) a fluorine-containing olefinic unsaturated monomer, (b) an olefinic unsaturated carboxylic acid monomer and (c) an olefinic unsaturated amide monomer. The invention also provides a water-based adhesive composition containing the polyvinyl alcohol graft copolymer and an electrode slurry composition containing the polyvinyl alcohol graft copolymer.

The invention provides dry-mixed mortar which is prepared from the following raw materials in parts by weight: 100- 150 parts of a modified polyurethane / diatomite composite material, 20-30 parts of expanded vermiculite, 25-35 parts of hollow glass beads, 5-12 parts of medium sand, 7-18 parts of sodium carboxymethyl cellulose, 15-30 parts of gypsum, 5-10 parts of EVA rubber powder, 3-7 parts of styrene, 3-7 parts of a chlorine salt antifreezing agent, 1-5 parts of an aliphatic water reducing agent, 10-20 parts of fly ash and 10-15 parts of a mineral admixture. The dry-mixed mortar is good in cohesiveness, high in strength, high in waterproof capacity and good in thermal-insulation fireproof effect, and has wide application prospects.

The invention discloses a wrapping layer, a medium trace element-containing externally-wrapped stable fertilizer with the wrapping layer and a preparation method of the medium trace element-containingexternally-wrapped stable fertilizer. The wrapping layer comprises an inhibitor, and the inhibitor is formed in the wrapping layer by spraying an acid liquor containing the inhibitor. The inhibitor in the wrapping layer is formed in the wrapping layer by spraying acid liquor containing the inhibitor; the inhibitor is added in the form of being dissolved in the acid liquor; compared with solid state, the advantages are that, uniform dispersion of the inhibitor can be ensured in the mixing process; therefore, the inhibitor is uniformly dispersed in the wrapping layer; the wrapping layer can befirmly attached to the surfaces of fertilizer particles; falling off is not easily caused, the actual content of the inhibitor in the obtained fertilizer is more consistent with the theoretical content, and it is ensured that the fertilizer is high in nutrient utilization rate; in addition, due to the addition of the acid liquor, the fertilizer has certain acidity, and when the fertilizer is usedfor alkaline soil, the effects of adjusting the pH value of the soil and improving the soil can be achieved, fertilizer using amount can be reduced, the efficiency can be improved, the crop yield canbe increased, and the crop quality can be improved.

The invention discloses an interior wall putty powder. The powder is prepared from, by weight, 40-60 parts of white cement, 10-30 parts of sea-foam stone powder, 10-30 parts of diatomaceous earth, 25-30 parts of organosilicon modified tapioca starch, 3-8 parts of bamboo charcoal fibers, 20-25 parts of sodium alginate, 10-15 parts of nano titanium dioxide, 1-2 parts of sodium hexametaphosphate, 2-5parts of rubber powder and 0.5-1 part of pigment. The putty powder adopts the white cement, the sea-foam stone powder, the diatomaceous earth and the like as base materials, and adds the interior wall putty powder prepared by using the organosilicon modified tapioca starch, the bamboo charcoal fibers, silica and the like, each component interacts and affects with each other, and the putty powderhas excellent performance, does not easily crack and fall off when used, has good environmental protection performance, and is harmless to a human body.

The invention relates to the technical field of gas pipeline fire prevention, in particular to a pipeline coating and a preparation method thereof. The pipeline coating is prepared from MOFs, vermiculite, an organic solvent and a bonding agent. The preparation method of the pipeline coating comprises the steps of dissolving the MOFs powder in the organic solvent to obtain a settled solution; adding vermiculite powder into the settled solution to obtain suspension liquid; adding the bonding agent into the suspension liquid and conducting spray granulation to obtain powder; spraying the powder onto the surface of a pipeline through a plasma spraying method to form the pipeline coating. The connection strength of the coating and metal is reinforced through powerful chemical bonds formed between the MOFs and the metal, and the phenomenon of powder stripping of the coating is avoided. As the MOFs is formed by arranging long-rage ordered crystal grains in microstructure, the pipeline coatinghas the good compactness, and the problem of cracking of the coating is solved. Meanwhile, through combination with the vermiculite, the pipeline coating can release crystal water contained in vermiculite layers when heated, thereby achieving the fire prevention effect.

The invention relates to powder paint, provides powder paint for the aluminum section and solves the problem that powder paint in the prior art is poor in adhesive force and prone to powder shedding and orange peel. The powder paint comprises, by weight, 66-70 parts of end carboxy polyester resin, 10-15 parts of titanium dioxide, 5-10 parts of ultrafine sericite, 12-18 parts of precipitated barium sulfate, 10-18 parts of alcohol, 4-5 parts of triglycidyl isocyanurate, 10-15 parts of silane coupling agent and 2-8 parts of expanded perlite.

The invention relates to the technical field of printing equipment, in particular to an anti-fake carbon belt and a recycling device. The anti-fake carbon belt comprises a belt base. The two surfaces of the belt base are coated with an ink layer and a back coating correspondingly. The belt base comprises an initial end, a powder removal section, a printing section and a winding final end. The ink layer is coated with transferable anti-fake ink which is uniformly smeared on the surface of the printing section. The powder removal section is arranged on the portion, prone to powder removal, of the belt base. According to the anti-fake carbon belt, due to the fact that the ink layer is coated with the transferable anti-fake ink, the anti-fake ink can be transferred to a printed material after heat transfer printing, and the anti-fake effect of the transferable anti-fake ink can be seen through an ultraviolet lamp; and meanwhile, through the arrangement of the powder removal section, the effect that powder removal of the printing section is avoided can be guaranteed, and the problems that printed writings are incomplete, and the check value is unrecognizable are solved.

The invention provides a polyvinyl alcohol graft copolymer which comprises a polyvinyl alcohol main chain, and a branched chain of the polyvinyl alcohol graft copolymer comprises a structural unit derived from the following monomers: (a) a fluorine-containing olefinic unsaturated monomer and (b) an olefinic unsaturated carboxylic acid monomer. The invention also provides a water-based adhesive composition containing the polyvinyl alcohol graft copolymer and an electrode slurry composition containing the polyvinyl alcohol graft copolymer. An electrode plate prepared from the polyvinyl alcohol graft copolymer has the beneficial properties of good adhesive force, low water absorption and the like, and is not easy to crack.

The invention discloses a wrapping layer, and an outer wrapping type fertilizer containing medium and trace elements and having the wrapping layer and preparation method thereof. The wrapping layer comprises medium and trace elements, and the medium and trace elements are formed in the wrapping layer through a reaction of powder containing the medium and trace elements with acid liquor. Since theacid liquid is added into the wrapping layer, the medium and trace elements can be uniformly dispersed in the wrapping layer. Compared with the addition of chelated or nanoscale trace elements in theprior art, the invention has the following advantages: the adding manner of the trace elements is simple, the content of the trace elements is easy to control, production energy consumption is not increased, production conditions are easy to control, and the cost of raw materials is low. In addition, the wrapping layer can be firmly attached to the surfaces of fertilizer particles and hardly fallsoff, so the actual content of the medium and trace elements in the prepared fertilizer better accords with a theoretical content, and the efficiency of the fertilizer is guaranteed. Due to the addition of the acid liquid, the fertilizer has certain acidity, and has the effects of adjusting soil acidity and alkalinity and improving soil when applied to alkaline soil.

The present invention discloses an environment friendly indoor latex paint, relates to the field of paints, and particularly relates to an environment friendly indoor latex paint. The environment friendly indoor latex paint is good in environment friendly effect, can absorb formaldehyde, and is strong in anti-bacterial and anti-cracking abilities. The environment friendly indoor latex paint includes: 20-30 parts of vinyl acetate-acrylic emulsion, 10-15 parts of light calcium carbonate, 10-15 parts of wollastonite powder, 5-10 parts of epoxy resin, 5-10 parts of organic bentonite, 1-2 parts of silane coupling agent, 1-5 parts of n-butanol, 1-2 parts of organosiloxane, 0.1-0.5 part of tricarboxylic benzoic acid, 1-5 parts of hydroxyethylcellulose, 30-50 parts of deionized water, 1-2 parts of photocatalyst and 2-3 parts of bamboo charcoal powder.

The invention discloses water purification equipment with a sterilization function. The water purification equipment comprises a water purification box body shell and a water purification box body inner container, a water inlet is arranged at the upper part of one side of the water purification box body shell, and the water inlet communicates with the water purification box body inner container; a water outlet is formed in the lower part of one side of the water purification box body shell and communicates with the water purification box body inner container; an activated carbon filter layer is transversely arranged in the water purification box body inner container; and the activated carbon filter layer is formed by processing an activated carbon antibacterial material and a food-grade adhesive. A filter screen and the activated carbon filter layer are arranged for double-layer filtration, the filter screen can block large-particle impurities in water, and the activated carbon filter layer can adsorb and filter small particles and impurities in water, so that the content of impurities in the finally obtained water is reduced to the minimum. Meanwhile, the activated carbon filter layer and an ultraviolet germicidal lamp are combined to fully sterilize and inhibit the water to be purified, so that the effect that bacteria are not easy to breed even if the air purifier is used for a long time is achieved.

The invention discloses a high-performance nano crystal whisker thickener for putty and a preparation method of the thickener. The thickener is prepared from, by weight, 16-22 parts of wallastonite, 11-17 parts of siliceous shale, 10-15 parts of fluorite slag, 15-20 parts of ceramic polishing slag, 12-18 parts of rectorite, 10-15 parts of waste molding sand, 20-25 parts of diatomite, 15-20 parts of red mud, 10-15 parts of salt gypsum, 5-10 parts of magnesia, 7-13 parts of aluminum sulfate, 4-7 parts of calcium silicate, 3-5 parts of petroleum coke powder, 6-9 parts of modifier A and 9-16 parts of modifier B. The nano crystal whisker thickener prepared by the method is excellent in comprehensive performance and has excellent thickening performance, workability and thixotropy, the putty is free of sagging during construction, bleeding, separation and lowering of layering degree of the puffy can be prevented, adhesion of the putty can be improved, adhesion force between the puffy and a base face can be increased, and the puffy is less prone to cracking and shedding.

The invention discloses a method for preparing a getter, and belongs to the technical field of getter preparation. In the present invention, ferric oxide is rusted into ferric oxide, mixed with aluminum powder and magnesium powder, put into a closed box, added with magnesium tape, aerated with oxygen, ignited with magnesium tape for reaction, and then acid-washed and alkali-leaked and baked After drying, it is soaked in an organic polar solvent, mixed and reacted with a foaming agent, and calcined in a muffle furnace to obtain a getter. The beneficial effects of the present invention are: the preparation steps of the present invention are simple, the strength of the obtained product is increased by 40-45%, and it is not easy to break, loosen and powder off after use; the air absorption rate is 15% higher than that of other products, the air absorption capacity is sufficient, Good ability.

The invention relates to the fields of energy saving and environmental protection, and in particular, relates to a method using granular activated carbon for decoloration and impurity removal. The method comprises the steps: dissolving a taurine crude product in hot water, carrying out coarse filtration, filtering out floccule and other suspended solids, then pumping into carbon towers filled with granular activated carbon by pumps, carrying out alternative decoloration and impurity removal with the two granular activated carbon towers, after adsorption is close to saturation, carrying out in-situ regeneration by alternatively using steam condensed hot water, and continuously producing. The activated carbon towers work for 9-15 months, and then the granular activated carbon is subjected to ultrasonic and microwave collaborative regeneration for reuse. The granular activated carbon is regenerated and reused, the use amount of the activated carbon is reduced, the method is green and environmentally friendly and saves energy, the production cost is reduced, the operating environment is improved, the continuty of decoloration and impurity removal of taurine is realized, the production process and technology are simplified, and the method is simple and convenient to operate, high in degree of automation and especially prone to realization of industrialization.

The present invention discloses an environmental-protection type external wall latex paint formula, wherein the environmental-protection type external wall latex paint comprises, by mass, 1-3% of a coloring agent, 0.5-1% of a preservative, 15-20% of a filler, 1-2% of a dispersant, 1-3% of a wetting agent, 0.5-1% of a defoamer, 1-2% of a film forming additive, 0.5-1% of a bactericidal agent, 2-3% of a thickener, 50-70% of an emulsion, and industry purified water.

The invention proposes a plastering mortar, which is prepared by weight from the following raw materials: 100-150 parts of polyurethane / epoxy resin / diatomite composite material, 15-20 parts of lime paste, 10-15 parts of 102 glue, mineral 30-40 parts of admixture, 70-120 parts of Portland cement, 7-12 parts of carboxymethyl cellulose, 3-10 parts of styrene, 3-5 parts of antifreeze, 4-7 parts of water reducer, gelatin 5‑10 parts, 3‑5 parts of sodium dodecylbenzenesulfonate, 5‑15 parts of polyethylene glycol 4000 and 200‑300 parts of water. The invention has good cohesiveness, high strength, strong waterproof ability, good moisture-proof, powder-repelling and crack-proof effects, simple preparation method, low cost, easy popularization and broad application prospects.

The invention discloses a water purification device with sterilization function, comprising a water purification box shell and a water purification box inner tank. A water inlet is arranged above one side of the water purification box shell, and the water inlet is connected to the water purification box body. A water outlet is arranged under one side of the shell of the water purification tank, and the water outlet is communicated with the inner tank of the water purification tank; an activated carbon filter layer is laterally arranged inside the inner tank of the water purification tank; the activated carbon filter layer is Processed from activated carbon antibacterial material and food grade adhesive. The invention is provided with a filter screen and an activated carbon filter layer for double-layer filtration, the filter screen can block relatively large particles of water impurities, and the activated carbon filter layer can adsorb and filter the tiny particles and impurities in the water, so that the final moisture content of impurities reduced to a minimum. At the same time, the activated carbon filter layer and the ultraviolet germicidal lamp are combined to fully sterilize and inhibit the water to be purified, and achieve the effect that bacteria are not easy to breed even after long-term use.

The invention relates to an ozonolysis catalyst and a preparing method and application thereof. The method comprises the steps of mixing a forming carrier with a manganese source solution, after fullwetting, conducing drying, then mixing the mixture with additive, conducting a reaction at constant temperature, after the reaction is completed, obtaining a regular carrier covered with a manganese precursor, and after baking, obtaining a catalyst product, wherein when manganese in a manganese source is at +7 price, the additive is reductant, and when manganese in the manganese source is at +2 price, the additive is oxidizing agent. The catalyst preparing process and the forming process are integrated, on the basis of the forming carrier, efficient manganese-based ozone catalyst is subjectedto in-situ growth on the outer surface of the forming carrier, the catalyst is stably combined with the carrier, the surface of the catalyst is stable, powder does not easily fall off, the particle size is adjustable, the appearance is formed, the ozonolysis capability is also efficient, the ozonolysis catalyst conveniently fills all air purifiers or fresh air system modules, production of an airpurification module can be accelerated, and the application prospect is good.

The invention provides a preparation method of plant functional coated paper for children's reading materials. The preparation method comprises the steps of pulping, pulp beating, reboiling, secondary pulping, raw paper preparation, sizing and post-treatment. According to the prepared coated paper, the strength of finished paper is improved, the coated paper is not prone to being torn by children, the dry strength ranges from 6.6 m / s to 7.0 m / s, and the wet strength ranges from 9.7 m / s to 10.2 m / s; good bending resistance is achieved, the transverse folding strength ranges from 3594 times to 3780 times, and the longitudinal folding strength ranges from 2357 times to 2518 times; and the antibacterial effect is good, the inhibition rate on staphylococcus aureus is 97.1-97.5%, the inhibition rate on escherichia coli is 94.5-95.8%, and the inhibition rate on typhoid bacillus is 95.7-96.3%.

The invention relates to the technical field of lithium batteries, in particular to a high-voltage positive plate and a preparation method thereof. The high-voltage positive plate comprises a positivecurrent collector and a positive pulp layer coated on the surface of the positive current collector, the positive pulp layer is obtained by carbonating a positive active material, a composite conductive agent and binder, and the composite conductive agent is composed of 57-79wt% of cellulose, 20-40wt% of graphene and 1-3wt% of aluminite powder. The high-voltage positive plate and the preparationmethod thereof have the advantages that the cellulose is added into the composite conductive agent, the high-voltage positive plate has a better network structure after the cellulose is carbonized, the migration rate of lithium ions in an electrode material can be effectively improved, the charging and discharging efficiency is improved, the use amount of the graphene is reduced, and the cost is reduced; a small amount of aluminum powder is added into the conductive agent, the practice shows that the electrical conductivity of the positive pulp layer can be effectively improved, and the effectof improving the charging and discharging of large current is achieved.

The invention discloses a preparation method for acrylonitrile copolymer type water blocking yarns. The preparation method comprises the following steps: adding starch and sodium chloride to a mixed solution of water and epichlorohydrin, stirring, adding a potassium hydroxide solution in a dropwise manner, carrying out a reaction, and carrying out a post-treatment to obtain cross-linked starch; sequentially adding a ferrous sulfate solution, acrylonitrile and hydrogen peroxide to the cross-linked starch aqueous solution, carrying out a heating reaction, and carrying out a post-treatment to obtain powdery acrylonitrile copolymer; impregnating synthetic fiber filaments in water in which the acrylonitrile copolymer is dispersed; and taking the obtained material, and drying to obtain the acrylonitrile copolymer type water blocking yarns. With the technical scheme, the invention provides the preparation method for the acrylonitrile copolymer type water blocking yarns, and the obtained acrylonitrile copolymer type water blocking yarns have the following characteristics that: a longitudinal water blocking effect is good; a high rate water absorption resin is firmly combined with the synthetic fiber filaments, such that powder shedding is not easily generated during use, no adhesion is generated, and a service life is long. In addition, the preparation method of the present invention has characteristics of simple production process, stable technology performance, strong practicability, and wide application.

The invention discloses a preparation method of polyacrylamide cable yarn, comprising the following steps of: adding weighted acrylamide, potassium persulfate, N,N'-methylenebisacrylamide and sodium carbonate into water and reacting in water at the temperature of 60 DEG C to obtain polyacrylamide solid; washing polyacrylamide by water, crushing and drying to obtain granules of polyacrylamide solid; and soaking polyester filament yarn into water, taking the polyester filament yarn out and stoving to obtain the polyacrylamide cable yarn, wherein the granules of polyacrylamide solid are suspended in water. In such a way, the preparation method of the polyacrylamide cable yarn, provided by the invention, has the advantages that the obtained polyacrylamide cable yarn is good in longitudinal water resisting effect, capable of rapidly expanding in the presence of water, high in water absorption rate, favorable in tensile strength and thermal stability and not easily generating powder-off or bonding situation when being used due to the firm combination of water-absorbent resin with high rate and the polyester filament yarn; and the method is simple in production technique, stable in technical performance, strong in practical applicability and capable of being widely applied.