12results about How to "High whiteness" patented technology

The invention discloses a desulfurization ash resource utilization process which comprises the following steps: performing magnetic separation on desulfurization ash, and mixing with water to obtain first desulfurization ash slurry; adding a mixed solution of sodium acetate and hydrochloric acid, reacting to obtain second desulfurized fly ash slurry with acidic pH, and collecting CO2 generated in the reaction process; introducing air to oxidize the second desulfurized fly ash slurry at the temperature of 60-80 DEG C, and stirring to react to obtain third desulfurized fly ash slurry; performing solid-liquid separation on the third desulfurized fly ash slurry to obtain solid calcium sulfate and a mixed solution of calcium acetate and sodium chloride; adding sodium carbonate into the mixed solution of calcium acetate and sodium chloride, and performing solid-liquid separation after reaction to obtain solid calcium carbonate and the mixed solution of calcium acetate and sodium chloride; a mixed solution of calcium acetate and sodium chloride is collected and circularly used for preparing the first desulfurized fly ash slurry. According to the method, the resource utilization process of the desulfurized fly ash is optimized, generation of harmful gases such as sulfur dioxide and ammonia gas is avoided, and valuable calcium sulfate and calcium carbonate products are obtained.

The application relates to the technical field of medical textile materials, and discloses an antibacterial and breathable medical gauze sheet, which comprises a base material and an antibacterial functional layer loaded on the base material, and the functional layer is formed by chemical reaction of carboxymethyl chitosan, tannic acid, boric acid, citric acid and zinc ions. Through boric acid complexation and citric acid competitive coordination, a double interpenetrating network structure of covalent bonds and coordination bonds is formed inside and outside the gauze fibers. The structure effectively inhibits the oxidative browning of tannic acid and eliminates the difference in the skin-core distribution of the functional components. The obtained gauze sheet is not only high in whiteness and good in breathability, but also has excellent washing fastness and long-acting and broad-spectrum antibacterial performance.

The present application relates to a kind of polybutylene terephthalate resin composition and its preparation method and application, the polybutylene terephthalate resin composition includes biobased polybutylene terephthalate resin, titanium element, phosphorus element and cobalt element;The weight content of titanium element in the polybutylene terephthalate resin composition is 20-150ppm, the weight content of phosphorus element is 2-50ppm, the weight content of cobalt element is 4-100ppm;The mass ratio of titanium element, phosphorus element and cobalt element in the polybutylene terephthalate resin composition is (2-20):(1-2):(1-10).The polybutylene terephthalate resin composition provided by the present application, by controlling the weight content and mass ratio of titanium element, phosphorus element and cobalt element within suitable range, can make polybutylene terephthalate resin composition have high whiteness, excellent mechanical properties and aging resistance.

This invention discloses an adenine-based heat stabilizer and its application in PVC composites, belonging to the field of heat stabilizer technology. The heat stabilizer is an adenine-based substance or a compound of an adenine-based substance and an auxiliary stabilizer. The adenine-based substance is adenine or adenine nucleoside, and the auxiliary stabilizer is at least one of calcium salt stabilizers, zinc salt stabilizers, and polyol stabilizers. This adenine-based heat stabilizer can improve the initial whiteness of PVC and impart better long-term stability to PVC. Its application in PVC composites can effectively improve the thermal stability and mechanical properties of PVC composites, possessing practical application value.

This invention belongs to the field of resin preparation technology, specifically relating to a polyphenylene sulfide resin and its preparation method. The preparation method includes the following steps: a composite stabilizer, anhydrous sodium sulfide, and a polar solvent are first mixed; the resulting first mixture undergoes a dehydration reaction to obtain a dehydrated reaction solution; the dehydrated reaction solution is then mixed with p-dichlorobenzene; the resulting second mixture undergoes prepolymerization and postpolymerization sequentially to obtain the polyphenylene sulfide resin; the composite stabilizer includes carbodiimide having the structure of formula I, lithium chloride, and sodium hydroxide; R 1 -(N=C=N) n -R 2 Equation I; n is an integer from 1 to 20; R 1 and R 2 The polymer is independently selected from substituted or unsubstituted alkyl, cycloalkyl, aryl, or aralkyl groups. The composite stabilizer in this invention effectively inhibits excessive hydrolysis by polar solvents, improves reaction efficiency, and controls the polymer molecular structure, thereby obtaining high molecular weight, high yield, and high whiteness PPS resin.

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.

This invention provides a method for preparing and applying a trifluoromethoxyamide-bridged aromatic amine compound. The preparation method utilizes a continuous flow reaction system comprising two continuous flow reaction units connected in series, namely reaction unit A and reaction unit B. An amidation reaction is carried out in reaction unit A, and a reduction reaction is carried out in reaction unit B. The prepared trifluoromethoxyamide-bridged diamine compound exhibits high purity and whiteness and can be used to prepare polyimides for various electrical and optical components.

The application relates to a production method of titanium white powder for polycarbonate with high gloss and impact resistance. The method is as follows: slushing titanium dioxide primary powder, dispersing the titanium dioxide with silicate after pH adjustment, sand grinding, coating a first layer of mixed film of loose silicon oxide and aluminum oxide under wet alkaline condition, coating a third layer of barium sulfate film under acid condition with pH=5.5-6.5, pressure filtration, drying, air powder treatment, adding isopropyl tri(dioctyl phosphoric acid acyl oxygen) titanate during air powder treatment, and obtaining the product. The method has the advantages of simple process, easy operation, high gloss and high impact resistance of polycarbonate products by adding a small amount of titanium white powder, processing stability, high whiteness of polycarbonate products and light weight.

The present application relates to a kind of calcium hydroxide / natural zeolite composite humidity control material and its preparation method, belong to non-metallic mineral functional materials and inorganic humidity control material field.The natural zeolite of the present application is made into ore pulp by adding water, while according to the preset Ca (OH) 2 coating amount and the reaction molar ratio of NaOH and CaCl2 to react to generate Ca (OH) 2 NaOH and CaCl2 are weighed, and water is added to configure into respective uniform solution respectively;After that, NaOH solution and CaCl2 solution are added to natural zeolite ore pulp in parallel flow, and Ca (OH) 2 is uniformly precipitated and coated on the surface of natural zeolite particles;Prepared Ca (OH) 2 / natural zeolite composite powder suspension with certain liquid-solid ratio;Then Ca (OH) 2 / natural zeolite composite powder suspension is hydrothermally reacted;Finally, the hydrothermal reaction product is filtered, washed, dried and depolymerized, and the calcium hydroxide / natural zeolite composite humidity control material is prepared.The present application significantly improves the humidity control performance of natural zeolite, and the preparation method is energy-saving and green environmental protection, has greater application value and good application prospect in the field of building humidity control material.

This invention discloses a method for producing high-quality nano-calcium carbonate from desulfurization ash, comprising the following steps: magnetic separation of the desulfurization ash; mixing the magnetically separated desulfurization ash with water to obtain a first desulfurization ash slurry; adding a mixed solution of sodium acetate and hydrochloric acid to the first desulfurization ash slurry, reacting to obtain a second desulfurization ash slurry with an acidic pH, and collecting the CO2 generated during the reaction; performing solid-liquid separation on the second desulfurization ash slurry to obtain the byproduct calcium sulfite and a mixed solution of calcium acetate and sodium chloride; adding sodium hydroxide to the mixed solution of calcium acetate and sodium chloride to adjust the pH to alkaline, and then performing solid-liquid separation to obtain metal hydroxide slag and a mixed solution of calcium acetate and sodium chloride; statically mixing the mixed solution of calcium acetate and sodium chloride with a sodium carbonate solution containing sodium tripolyphosphate using a peristaltic pump, and separating to obtain solid nano-calcium carbonate. This invention achieves the resource utilization of desulfurization ash and also prepares high-quality nano-calcium carbonate.

This invention discloses a method for preparing raw bamboo fiber based on a performic acid / sodium sulfite composite system. The raw bamboo is treated with a performic acid and sodium sulfite composite system, achieving a lignin removal rate of 97-100% while minimizing damage to the bamboo fiber. The fiber strength after this treatment is significantly increased, making it suitable for textiles and other fields. The product of this invention combines the high-quality qualities of crude bamboo obtained through alkali treatment and redox principles, yielding spinnable raw bamboo monofilaments with a diameter of several hundred micrometers, high degree of delignification, good whiteness, and excellent strength.

This invention relates to the field of architectural ceramics technology, disclosing a titanium sphene crystal frit, its preparation method, and its application. The raw materials include kaolin, titanium dioxide, quartz, potassium feldspar, calcite, and wollastonite. By pre-firing the titanium sphene crystal frit using this formula, the titanium sphene crystals are pre-dissolved in the glass phase. During the subsequent glaze firing process at 1200℃, the titanium sphene crystals melt again and precipitate a second time, resulting in an opaque glaze layer. This secondary crystallization enhances the chemical stability of the titanium sphene crystal frit during subsequent glaze firing, leading to a more stable increase in the solar reflectance of the fired glaze. This solves the problem of unstable reflectivity in glazes when directly using titanium sphene powder or combining it with titanium dioxide and titanium frit to directly form titanium sphene crystals during glaze firing.