45results about How to "No black spots" patented technology

A light diffusing film which is excellent in luminance uniformity and which exhibits no partial deterioration in light transmittance, thereby eliminating the formation of black spots. The light diffusing film, which has a monodisperse light diffuser and a light diffusing layer consisting of a light diffuser and a binder resin on one plane of a base, in which the lamination ratio is 10% or less and the diameter of flocculated particles in the light diffuser is 50 μm or less, exhibits excellent luminance and thermal properties, so that it can be suitably used in various kinds of picture display devices, in particular, in a display device employing LED (light emitting diode) lamps or an LCD (liquid crystal display device) backlight system.

The invention discloses a special compatilizer for improving hydrolysis heat stability of a PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) alloy and an alloy. The compatilizer is a terpolymer formed by copolymerizing aromatic vinyl monomer, acrylonitrile monomer and glycidyl methacrylate. The PC / ABS alloy with high hydrolysis heat stability comprises the following components in percentage by weight: 50-85% of PC, 10-45% of ABS, 0.5-5% of compatilizer, 0.1-1% of antioxidant and 0.1-0.5% of lubricant. Compared with the prior art, the special compatilizer for the PC / ABS alloy can be blended with other raw materials and subjected to extrusion and granulation in the preparation process to obtain the PC / ABS alloy with excellent hydrolysis heat stability on the premise of maintaining excellent mechanical properties in a simple, effective, convenient and cheap way.

The invention discloses a low-etching photoresist cleaning agent, which is characterized in that the invention comprises (a) quaternary ammonium hydroxide, (b) dimethyl sulfoxide, (c) alkyl glycol aryl ether and derivation of the alkyl glycol aryl ether whose molecular formula is like the indication of formula I, (d) aminoethyl alcohol, (e) water, (f) inhibitor, in the formula I, R1 chooses arylamine which contains 6 to 18 carbon atoms, m=2 to 6, n-1 to 6. The invention also provides a cleaning method for using the cleaning agent, which is characterized in that indoor temperature is less than 85 DEG C, a semiconductor crystal with photo resist is cleaned by low-etching photoresist cleaning agent, and then which is cleaned by deionized water, and is dried in nitrogen. The cleaning agent of the invention can be used for removing photo resist (light blockage) or other residues on metals, metal alloy, or dielectric substrate. The cleaning agent has strong cleaning ability, which has an obvious effect of corrosion inhibition to metals such as earth silicon, copper, phosphorus, and stannum and low K dielectric material and the like, and no black dots can be guaranteed, and the invention has a good application prospect in the microelectron field such as the cleaning of semiconductor crystal and the like.

The invention discloses a bamboo fiber / polylactic acid composite material and a preparation method thereof. The bamboo fiber / polylactic acid composite material specifically comprises the following rawmaterials in parts by weight: 60-80 parts of polylactic acid, 10-30 parts of talcum powder, 3-15 parts of modified bamboo fibers, 2-15 parts of a flexibilizer, 0.1-0.3 part of a coupling agent, 0.1-0.3 part of an antioxidant, 0.2-0.6 part of an auxiliary antioxidant, 0.2-0.5 part of a lubricating agent, 0.2-1 part of a nucleating agent, 0.1-0.3 part of an anti-floating fiber agent and 0.5-3 partsof a hydrolysis resistance agent. According to the composite material disclosed by the invention, the bamboo fibers are modified and thermally treated, the bamboo fibers and talcum powder are treatedby using the coupling agent, and according to a certain mixing sequence and suitable extrusion process parameters, the problems that the bamboo fiber / polylactic acid composite material is rough in surface and has silver filaments and local black spots and the compatibility between the polylactic acid and the bamboo fibers is poor are solved.

The invention discloses a naturally dried photosensitive acid-corrosion-resistant electroplating printing ink and a preparation method thereof. The naturally dried photosensitive acid-corrosion-resistant electroplating printing ink comprises the following components in parts by weight: 50-80 parts of alkali soluble photosensitive resin, 0-5 parts of cellulose used for coating, 2-10 parts of active diluents, 2-8 parts of photosensitizer, 10-40 parts of filler, 0.5-1 part of pigment, 5-15 parts of solvent and 0.5-3 parts of auxiliaries, wherein the alkali soluble photosensitive resin is prepared from the following components in parts by weight: 40-60 parts of mixture consisting of 20-30 parts of n-butyl acetate, 0-30 parts of methyl isobutyl ketone, 0-20 parts of methylbenzene and 0-20 parts of propylene glycol monomethyl ether acetate, 25-40 parts of styrene-maleic anhydride resin, 15-20 parts of acrylic acid monomer, 0.1-1.0 part of catalyst and 0.1-1.0 part of polymerization inhibitor. The naturally dried photosensitive acid-corrosion-resistant electroplating printing ink disclosed by the invention does not need baking, is dried naturally after being diluted and is energy-saving and is resistant to acid and electroplating, and a film formed after the electroplating printing ink sprayed and dried naturally is high in adhesive force, high in hardness, quick in development, capable of obtaining clear images and resistant to acid corrosion.

The invention belongs to the field of complementary food nutrition supplement and provides an infant complementary food nutritional bag and a preparation method thereof. The infant complementary food nutritional bag is prepared from the following components in parts by mass: 90-100 parts of instant tofu powder (with protein content being 18 percent), 6.1-7.1 parts of a compound nutrition enhancer, 15-21 parts of soy protein isolate (with sodium being smaller than or equal to 1000mg / 100g), 1.5-2.5 parts of freeze-dried apple powder, 1.5-2.5 parts of freeze-dried banana powder, 1.5-2.5 parts of carrot powder and 5.9-6.9 parts of whole milk powder. The infant complementary food nutritional bag is specially designed aiming to nutritional requirements of infants of 6-12 months, is rich in micronutrients including protein, iron, zinc, calcium, vitamin A, vitamin B1, vitamin B2, vitamin B12, vitamin D3, folic acid needed by growth and development in key window periods of the infants, is reasonable in proportion, definite in efficacy, clear in mechanism, remarkable in synergetic effect and liable to produce, accords with a national production standard published by Ministry of Health and is safe and reliable.

The invention discloses a PET composite material, which comprises the following components in parts by weight: 34 to 55 parts of PET, 25 to 45 parts of enhanced filling material, 3 to 8 parts of composite nucleating agent, and 0 to 3 parts of flexibilizer; wherein the composite nucleating agent comprises a chemical nucleating agent and a plasticizer, the weight ratio of the plasticizer to PET resin is 3.5-7:100, the plasticizer is prepared by compounding a benzsulfamide plasticizer with other plasticizers, other plasticizers can be one or more of polyethylene glycol-diethyl hexyl alcohol, neopentyl glycol diphenyl ester, tribenzyl propylidene ether diethyl hexyl alcohol, and triethylene glycol diphenyl ester, the structural formula of the benzsulfamide plasticizer is represented in the description, and in the structural formula, R represents a branched alkyl group or a straight chain alkyl group. The composite material is injection-moulded at a mould temperature of 85 DEG C, the crystallization is complete, the moulding period is short, and the PET composite material can be used to produce large moulded goods or precision thin-wall moulded goods.

The invention discloses a high-efficiency diamond polishing agent which is prepared from the following raw materials in percentage by weight: 5-20 percent of ultra-precision diamond micro powder, 10-20 percent of ethyl orthosilicate, 20-30 percent of solvent, 0.2-0.8 percent of strong acid, 10-30 percent of surface active agent, 10-25 percent of wetting agent, 5-15 percent of dispersing agent and 0.1-5 percent of PH conditioning agent. According to the high-efficiency diamond polishing agent, the diamond micro powder is subjected to surface modification by using ethyl orthosilicate, so that a silicon dioxide coating layer is formed on the surface of the diamond micro powder, and during polishing, the coating layer plays a role in buffering the diamond micro powder on the inner layer; through performing multiple times of crushing and shaping on the diamond micro powder and improving surface modification process, the morphology of the diamond micro powder is closer to an octahedron; the prepared polishing agent has a better polishing effect to high-hardness metal materials such as high-carbon steel, also has a better polishing effect to crisp and hard materials such as Cr2O3, ceramics, jade and quartz, and is capable of completely preventing the damage on the surface of a material to be polished, and free from generating scratches, black points, and particle surface residues during polishing.

The invention discloses a carbon nanotube modified PET antistatic thin film. A method for preparing the carbon nanotube modified PET antistatic thin film includes: stirring carbon nanotube at a high speed; at the same time, dissolving a dispersant in a liquid, and spraying the liquid into carbon nanotube powder while being stirred to activate the surface of the carbon nanotube; adding obtained activated carbon nanotube as a conductive filling agent into a PET material matrix to prepare PET / carbon nanotube conductive masterbatch good in conductive performance; mixing the PET / carbon nanotube conductive masterbatch with auxiliaries like PET matrix resin, a thermal oxidation stabilizer, a flow modifier and a friction-resistant agent, and obtaining the PET antistatic thin film through blow molding, tape casting or bidirectional stretching processes. The PET antistatic thin film prepared by the method is good in conductive performance, high in antistatic durability and long in service life.

The invention discloses an active carbon nanotube modified polyethylene antistatic thin film. The active carbon nanotube modified polyethylene antistatic thin film is prepared from the following components in parts by mass: 70 to 95 parts of a PE (Polyethylene) polymer matrix material, 0.01 to 10 parts of active carbon nanotubes and 0.1 to 20 parts of an auxiliary agent; the auxiliary agent is formed by mixing one or more than two of a dispersant B, a coupling agent, an antioxidant, a lubricant and an anti-abrasion agent; the active carbon nanotubes are prepared by dissolving a dispersant A into a solvent to obtain a dispersant solution, spraying the dispersant solution into carbon nanotubes stirred at a high speed through a high-pressure spraying method and stirring and mixing at a high speed. The polyethylene antistatic thin film disclosed by the invention is good in conductive property, high in antistatic durability and long in service life.

The invention provides a reagent capable of preventing and eliminating pollution of mammalian cells, and belongs to the field of microbial pollution control in mammalian cell culture. A polypeptide having a sequence of SEQ ID NO:1 can be used for preventing and eliminating pollution of the mammalian cells; the reagent is composed of the polypeptide having the sequence of SEQ ID NO:1 and amino acid and does not contain any antibiotic component. The product is prepared in accordance with the concentration required for prevention and elimination of pollution, microbial pollution in the mammalian cells can be effectively prevented and eliminated, and the defects of use restriction of antibiotic components in a conventional product and longer cell treatment period are overcome; and the product is good in stability and easy to preserve.

The invention discloses a rapidly-assembled lamp. The rapidly-assembled lamp comprises a heat dissipation lamp cup (6), a power source (5), spring buckles (4), a heat dissipation cup (3), a light source (2) and a lens (1). The power source is fixed inside the heat dissipation lamp cup (6) in a buckled manner. The light source (2) is in threaded connection with the lens (1) and then connected withthe power source (5) through the heat dissipation cup (3) in which a through hole is formed. The spring buckles (4) are installed on the outer side of the heat dissipation cup (3), and the heat dissipation cup (3) is fixed inside the heat dissipation lamp cup (6) through the spring buckles (4). A number of cover plate buckles are arranged at the opening of the heat dissipation lamp cup (6). The heat dissipation lamp cup (6) is buckled with the lens (1) through the cover plate buckles. According to the rapidly-assembled lamp, the use is convenient; adaptability is good; and the problems in theprior art that light sources need to be installed on different lamp bodies so that the light sources are used, adaptability is poor, a lamp needs to be replaced when a different lighting effect is applied, and the resources are wasted are solved.

The invention belongs to the field of complementary food nutrition supplement and provides a complementary food nutrition bag for infants and a preparation method of the nutrition bag. The nutrition bag is prepared from components in parts by mass as follows: 88-98 parts of instant bean powder (18% protein content0, 7.2-7.8 parts of a compound nutrition enhancer, 15-21 parts of soy protein isolate (sodium lower than or equal to 1,000 mg / 100g), 1.5-2.5 parts of freeze-dried apple powder, 1.5-2.5 parts of freeze-dried banana powder, 0.8-1.2 parts of freeze-dried kiwi powder, 0.8-1.2 parts of freeze-dried sweet orange powder, 2-3 parts of carrot powder and 4.5-5.5 parts of whole milk powder. The nutrition bag is designed specifically for infants of 1-2 ages in China, is rich in micronutrients, such as protein, iron, zinc, calcium, vitamin A, vitamin B1, vitamin B2, vitamin B12, vitamin D3, folic acid and the like, required by growth and development of the infants in the key window period, is reasonable in proportion, has an exact effect, clear mechanism and significant synergistic effect, is easy to produce, conforms to national standard production issued by Ministry of Public health and is safe and reliable.

The invention belongs to the field of supplementary nutrition and provides a children's supplementary nutrition package and a preparation method thereof. The children's supplementary nutrition is prepared from, by weight, 70-80 parts of whole milk powder, 15-21 parts of soy isolate protein (sodium is smaller than or equal to 1000mg / 100g), 6-7 parts of calcium carbonate, 2-4 parts of fructo-oligosaccharide, 4-6 parts of galacto-oligosaccharides, 4-6 parts of oat powder (pregelatinized), 4-6 parts of rice meal (pregelatinized), 4-6 parts of corn flour (pregelatinized), 3-5 parts of multi-vitamins, 1-1.6 parts of composite mineral, 0.5-1.5 parts of frozen-dried apple powder, 0.5-1.5 parts of frozen-dried kiwi powder and 0.5-1.5 parts of carrot powder. The children's supplementary nutrition package specially designed for Chinese babies 13-36 months old is reasonable in proportion, definite in efficacy and clear in mechanism, micronutrients required by the babies in critical growth and development window periods are supplemented, and the package produced according to GB / T22570 national standards issued by ministry of health is safe and reliable.

The invention discloses a novel method for preparing a dehydrated cauliflower. The novel method disclosed by the invention comprises the following steps of: (1), pre-processing a raw material: washing the cauliflower as the raw material by using saline solution with the concentration of 0.1-0.3% by weight to remove silt and dirt on the surface of the cauliflower; (2), blanching: blanching by putting the cauliflower in NaOH aqueous solution with the concentration of 0.2% by weight at 80-90 DEG C for 1-2 min; (3), cooling: necessarily picking up the blanched cauliflower instantly, and transferring the cauliflower into a cold water tank to cool; (4), protecting colour: putting the cooled cauliflower in citric acid aqueous solution with the concentration of 0.05% by weight, and quenching for 3-6 min to protect colour; (5), draining: after protecting colour of the cauliflower, picking up the cauliflower to drain; (6), dehydrating and drying: keeping the temperature at 50-60 DEG C at the beginning of dehydrating, then, increasing the temperature to 70-80 DEG C, and decreasing the temperature to 50 DEG C after drying, wherein the drying and dehydrating time is 6-8 h; (7), packaging: packaging the cauliflower by using a plastic film.

The invention discloses a method for culturing holotrichia diomphalia larvae. The method comprises the following steps: (1) ovum collection: laying fermented tree leaf fodder in culture tanks or culture boxes, and laying green fodder on the surface of the fermented tree leaf fodder; placing the culture tanks or culture boxes in a propagation room of spawning female adults, enabling the female adults to penetrate into the feed and spawn, and then, cleaning up the adults from the culture tanks or culture boxes; (2) culture of ova and 1-age holotrichia diomphalia larvae: transferring the spawned culture tanks or culture boxes into a culture room, and putting fermented tree leaf fodder into the culture tanks or culture boxes once every 5 to 9 days; (3) culture of 2-age to 3-age holotrichia diomphalia larvae: uniformly putting fermented tree leaf fodder into the culture tanks or culture boxes once every 5 to 9 days; (4) separation of holotrichia diomphalia larva products: taking out the holotrichia diomphalia larvae when the average weight of the holotrichia diomphalia larvae in the culture tanks or culture boxes reaches 2.5g to 3g. According to the method, multiple aspects such as culture density, culture conditions, feed preparation and automated culture are researched, so that the method is applicable to intensified culture of the holotrichia diomphalia larvae.

The invention discloses a carbon nanotube modified polypropylene antistatic film which is prepared by the following method: stirring carbon nanotube at high speed and simultaneously dissolving a dispersant in a liquid and spraying the liquid into the stirred carbon nanotube powder by a spraying mode to surface-activating the carbon nanotube, adding the active carbon nanotube used as a conductive filler into a PP material matrix to prepare PP / carbon nanotube conductive master batch with good conductivity, mixing the PP / carbon nanotube conductive master batch with PP matrix resin and a thermal-oxidative stabilizer, a flow modifier, an abrasive agent and other auxiliary agents, and preparing the polypropylene antistatic film by blow molding, tape-casting or two-way stretching technology. The prepared polypropylene antistatic film has good conductivity, strong antistatic endurance and long service life.

The invention discloses a celadon-Jianzhan porcelain combined firing process for porcelain. The process comprises the following steps: preparing a green body raw material, Jianzhan glaze slip and celadon glaze slip; subjecting the green body raw material to throwing so as to form a cup shape, conducting green body trimming, engraving a pattern outside a cup body, and carrying out biscuiting and cooling to obtain a green body; conducting glazing; and putting the glazed and air-dried green body into an electric kiln for roasting, stopping the electric kiln, carrying out natural cooling, and drawing a produced cup out of the electric kiln. According to the invention, Longquan celadon and Jianzhan porcelain firing processes are combined, the interior and the mouth edge of the fired porcelain cup are Jianzhan porcelain glaze surfaces, and the exterior of the cup is a celadon glaze surface with a carved pattern; and a combination of celadon and Jianzhan porcelain breaks the constraint of traditional porcelain types, presents strong visual impact and artistic aesthetic feeling, and is of milestone significance in the field of porcelain.

The invention discloses an activated carbon nanotube modified polypropylene (PP) antistatic film. The PP antistatic film is prepared from the following components in parts by mass: 70-95 parts of PP base materials, 0.01-10 parts of activated carbon nanotubes and 0.1-20 parts of an aid, wherein the aid is one or a mixture of two or more of a dispersant B, a coupling agent, an antioxidant, a lubricant and an abrasive agent; an activated carbon nanotube is prepared through the following steps: the dispersant A is dissolved in a solvent, and a dispersant solution is obtained; then, the dispersant solution is sprayed into the carbon nanotube stirred at a high speed with a high pressure spray method, and the activated carbon nanotube is prepared after high-speed stirring and mixing. The PP antistatic film has good conductivity, high antistatic durability and long service life.

The invention relates to a production technology for processing by-products left after processing of soybean protein isolate into soybean dietary fiber powder. The processing technology comprises steps as follows: residues are obtained from soybean protein isolate and conveyed to a temporary storage tank for low-temperature storage; the stored residues are sterilized; the sterilized residues are put in a dehydrator for dehydration, and a filter cake is obtained; the dehydrated filter cake is conveyed to a crusher and conveying integrated machine through a belt and conveyed to a flash dryer; the temperature of a dried material is 35-50 DEG C, and the material is separated by an air cooling, conveying and separation integrated machine system and then enters a temporary storage bin; a semi-finished product is ground by an ultra-fine grinder into 80-300 meshes after drying and cooling; the ground material is screened and subjected to anti-dust treatment, and soybean dietary fibers can be obtained.

The present invention relates to a nutrient and defence element premix and preparation method thereof, more specifically to a composite food nutrition intensifying agent, pertaining to the field of food additives and nutrition intensifying technology. The product formula of the invention is composed by the ferralia, zinc agent, copper agent, taurine, niacin, stabilizing agent and carrier. The invention has positive effects of reasonable formula, synergy, good mobility, long shelf-life, non-electrostatic adsorption, non-toxic side effects, safety and stability, and easy achievement of implement the automation packaging of products, and the like; but also has advantages of easy intensifying and addition process, streamline procurement procedures, storage convenience, reduced waste, etc., thereby providing facilitation guarantee for large-scale industrial production.

The invention provides PU (polyurethane) composite leather which comprises a leather blank and a surface treatment layer. The components of the surface treatment layer comprise polyurethane, a bridging agent, a tackifier and a smoothing agent; the leather blank comprises a base cloth layer, a bonding layer and a surface layer; and the material components of the blank comprise polyurethane, a dissolving medium, a hardening agent, a catalyst, a solvent, a flame retardant, a pigment and the like. The invention also provides a preparation method of the composite leather. The preparation method comprises the following steps of preparing the surface layer, preparing the bonding layer, bonding the surface layer, the bonding layer and the base cloth layer together, stripping, curing and treating the surface layer. According to the PU composite leather obtained through the preparation method, the dispersity and the leveling property of the raw materials are fully exerted, the mesh surface of the product is free of black spots and uneven coating, a hand feeling agent is evenly dispersed and free of bubbles, the abradability is excellent, and then the flatness and the high yield of the product are achieved.

The invention discloses a preparation method of easy-to-store and halogen-free scaling powder and belongs to the technical field of scaling powder preparation. The preparation method comprises the following steps: firstly, succinic acid, adipic acid, itaconic acid and triisopropanolamine serve as core materials and acrylic resin BS965M serves as a shell material to prepare a microencapsulation active agent; then, loofah sponge obtained through loofah treatment is smashed and mixed with deionized water, the mixture is filtered to obtain loofah sponge leach liquor, loofah sponge leach liquor and chitosan are stirred to obtain loofah sponge anti-microbial clear liquid; and finally, the microencapsulation active agent, nitroethane, sorbitol and an emulgator are reacted in a stirring and heating manner, filtering and filter residue removal are carried out to obtain the easy-to-store and halogen-free scaling powder. The easy-to-store and halogen-free scaling powder prepared through the preparation method disclosed by the invention is high in activity and easy to store; after being painted on the surface of a welded object, the easy-to-store and halogen-free scaling powder can clean the surface and improve the welding property; the easy-to-store and halogen-free scaling powder is better in wettability, does not have a dark spot and has less residue after being welded, effectively improves production efficiency of welding, and has broad application space.

The invention discloses a high-wearability hollow rail aluminum alloy plate which comprises an aluminum alloy plate matrix and a high-wearability polyurethane primer coating the surface of the aluminum alloy plate matrix. The high-wearability polyurethane primer comprises the following raw materials in part by weight: 30-40 parts of acrylic polyurethane, 15-25 parts of modified cyanate resin, 1.3-1.5 parts of talcum powder, 0.5-1 part of superfine barium sulfate, 0.6-0.9 part of a de-foaming agent, 0.5-0.8 part of a leveling agent and 0.3-0.6 part of a film forming agent. The high-wearabilityhollow rail aluminum alloy plate disclosed by the invention has excellent wearability and simultaneously has good film-forming property and processing property.

The invention discloses a pipe blank injection molding method and a pipe blank mold for high-capacity plastic bottles. The injection molding method includes filling the temperature-control pipe blank mold with injection molding materials to form pipe blanks by means of injection molding, and is characterized in that the integral pipe blank mold is of a cooling structure with multiple flow channels, a pipe blank mold core and a pipe blank mold cavity are cooled in a temperature-control mode, and the temperatures of cooling media are controlled by temperature control equipment, so that the temperature of cooling oil of the pipe blank mold core is 50-60 DEG C under the control, and the temperature of cooling oil of the pipe blank mold cavity is 45-55 DEG C under the control; the hot flow channel of a bottom feed inlet is divided into three portions, and heat of each portion can be preserved differently, so that heat of residual materials which are not fed into the pipe blank mold cavity can be preserved, and the residual materials can be prevented from flowing outwardly. The pipe blank injection molding method and the pipe blank mold have the advantages that the integral pipe blank mold is of the cooling structure with the multiple flow channels, the temperatures of the different portions can be differently controlled by temperature control devices, accordingly, the molding temperatures of products can be effectively controlled, the molding quality of the products can be guaranteed, and the residual materials can be prevented from being hardened or flowing outwardly.

The invention discloses a solid beverage of fortified complementary vitamin D, belonging to the fields of nutrient fortified food and solid beverage technologies. The solid beverage is characterized by being prepared from medium chain triglyceride (MCT) powder, apple juice powder, food grade yeast powder, and vitamin D3 water dispersible powder. The solid beverage of the fortified complementary vitamin D provided by the invention has the advantages and beneficial effects of reasonable ratio, accurate efficacy, clear bio-synergy, high pertinency, and remarkable synergistic effects, and the solid beverage is easy to produce and convenient to take; the solid beverage provided by the invention has no any harmful effect in the aspect of color and luster, mouthfeel, stability, and the like; dark spots, sediment and flotage do not occur; oxidative smell of the product does not occur in a short time; the shelf life is up to 24 months, the solid beverage is easy to accept by an infant, any preservative, essence and the like do not exist; the solid beverage fully complies with the national food safety standard; and harm and toxic and side effects are not brought to a body.

The invention relates to the technical field of ceramic materials, in particular to a black ceramic and a preparation method thereof. The method for preparing black ceramics provided by the invention comprises the following steps: sintering a ceramic body and carbon black in a closed environment to obtain the black ceramics. The preparation method of black ceramics provided by the present invention is simple in process, easy in operation and easy to control, does not need to add any black high-temperature pigments or colored metal oxides before blank making, does not change the basic formula of ceramic blanks, and does not change the kiln structure And the firing atmosphere, only changing the firing process of the ceramics, can achieve the firing of black ceramics with pure color and high density. The black ceramics prepared by it are uniform without black spots and high in blackness. After refiring, the black hair color is stable and does not fade.

The invention provides loudspeaker coating glue. The loudspeaker coating glue comprises, by weight, 100-150 parts of clear water, 30-45 parts of polyvinyl alcohol, 20-35 parts of formaldehyde, 10-15 parts of hydrochloric acid, 2-3 parts of urea, 5-8 parts of antifoaming agents, 5-8 parts of flowing agents, 3-5 parts of preservatives, 2-5 parts of dispersing agents and 6-10 parts of adhesives. A coating process includes S1) glue preparation: feeding the polyvinyl alcohol to a round-bottomed flask, sequentially adding the flowing agents, the preservatives, the dispersing agents, the adhesives and the clear water, stirring the mixture while heating, maintaining the temperature at 90-95 DEG C until the polyvinyl alcohol is completely dissolved, lowering the temperature to 70-80 DEG C, and dropwise adding 36-38% of the hydrochloric acid to adjust the pH value. The loudspeaker coating glue and the coating process thereof have the advantages that proper ingredients are selected to prepare theliquid glue with low fluidity, the flue is not liable to overflow towards the edge under pressure after coating, the coating mode is optimized, waste of the glue is reduced, and the coating quality is ensured.