184 results about "Ultraviolet absorbance" patented technology

The invention discloses a dosing system for pre-oxidation enhanced coagulation in a water plant and an intelligent regulation and control method, and relates to the technical field of pre-oxidation enhanced coagulation water treatment. The system comprises a raw water pump, a mixing tank, a tubular static mixer, a flocculation tank, a sedimentation tank, an industrial personal computer and multiple online detection instruments which are sequentially connected in series, so as to monitor the flow, conductivity, pH value, temperature, turbidity, ultraviolet absorbance and organic matter concentration of raw water. Key water quality indexes are monitored in real time through data collection and a pre-oxidation enhanced coagulation regulation and control system based on machine learning of an industrial personal computer, and intelligent and accurate prediction of the dosage of oxidants (potassium permanganate, permanganate composite agents and potassium ferrate) and coagulants is achieved; the effluent turbidity, the effluent ultraviolet absorbance and the effluent organic matter concentration of the sedimentation tank are fed back in real time, the adding amount of the oxidizing agent and the coagulant is dynamically adjusted through a regulation and control algorithm, the effluent quality is guaranteed, and medicine consumption is reduced.

The invention discloses a preparation method of flame-retardant silicone rubber resistant to long-term thermal aging, and relates to the technical field of high-molecular compound composition anti-aging rubber. The flame-retardant silicone rubber is prepared from the following components in parts by mass: 75 to 100 parts of methyl vinyl silicone rubber raw rubber, 18 to 28 parts of fumed silica, 20 to 35 parts of aluminum oxide trihydrate, 0.5 to 3 parts of platinum flame-retardant synergist, 2 to 5 parts of heat-resistant additive, 1.5 to 2.5 parts of structured control agent, 1 to 2 parts of cross-linking agent, 2 to 10 parts of anti-aging agent and 8 to 13 parts of fluorinated silicone rubber. Through a synergistic flame-retardant system, the silicone rubber disclosed by the invention shows obvious advantages in flame-retardant capability, can reach a higher flame-retardant grade, effectively delays flame propagation, and reduces the risk of fire disasters. The weather resistance of the silicone rubber is remarkably improved due to the ultraviolet absorption function and the anti-oxidation function of the anti-aging agent, so that the silicone rubber can effectively resist ultraviolet rays and oxidation under the long-term outdoor solarization condition, and the performance reduction and the appearance deterioration are reduced.

An aqueous ultraviolet-absorbing resin emulsion, and an aqueous resin emulsion composition containing the emulsion is provided, wherein the emulsion is excellent in compatibility with a synthetic resin and light resistance. Also, the emulsion improves stability in blending with an aqueous emulsion of the synthetic resin, and prevents bleed out of the ultraviolet-absorbing resin on the surface of a coating film. Further, the aqueous ultraviolet-absorbing resin emulsion imparts excellent alkali or solvent resistance to a synthetic resin poor in alkali or solvent resistance. More specifically, an aqueous resin emulsion composition comprising (I) an aqueous ultraviolet-absorbing resin emulsion and (II) an other aqueous resin emulsion is provided, wherein the emulsion (I) is obtained by urethanizing (A) a polyol component having an ultraviolet-absorbing group {e.g., 1,1-bis[3-(2H-benzotriazol-2-yl)-4-hydroxy-benzeneethanol]methane}, (B) a polyol if necessary, (C) an alkyl or aryl dialkanolamine compound, and (D) an organic polyisocyanate in (E) an organic solvent, diluting the reaction mixture with (F) an organic solvent having a boiling point lower than 100° C. to give a resin solution, neutralizing the resin solution with (G) a neutralizing agent, and dispersing the resultant in water.

The invention relates to the technical field of sewage treatment, in particular to a dynamic control method applied to a culture tail water circulation treatment system. The method comprises the following steps: continuously detecting aquaculture tail water on a water inlet pipeline, calculating the ratio of chemical oxygen demand to five-day biochemical oxygen demand as a first degradation index, and calculating the ratio of ultraviolet absorbance to total organic carbon concentration as a second degradation index; according to the first degradation index and the second degradation index, identifying aging complementary and range complementary organic load degradation characteristics, and determining a process treatment path based on the organic load degradation characteristics; performing primary pretreatment on the aquaculture tail water in different process treatment paths to obtain intermediate water quality data; detecting the ammonia nitrogen concentration of the intermediate water quality data, and extracting the time change rate of the ammonia nitrogen concentration as an ammonia nitrogen conversion parameter. According to the invention, the oxygen utilization efficiency and the removal rate of organic matters and nitrogen are improved through regional dissolved oxygen and function configuration optimization.

The invention discloses a fluorescent colorimetric sensor for detecting circulating tumor cells and a preparation method of the fluorescent colorimetric sensor. The preparation method comprises the following steps: S4, adding a prepared detection antibody modified with horse radish peroxidase and used for detecting the circulating tumor cells, and incubating; s5, adding a Tris buffer solution and a H2O2 solution, and incubating; s6, preparing an EuMOF nanoflower solution; and S7, adding the EuMOF nanoflower solution and 3, 3 ', 5, 5'-tetramethyl benzidine to react, detecting the fluorescence intensity in the presence of circulating tumor cells with different concentrations by using a luminoscope, detecting the ultraviolet absorbance value in the presence of circulating tumor cells with different concentrations by using a multifunctional microplate reader, and constructing a fluorescence intensity-concentration working curve and an ultraviolet absorbance value-concentration working curve. The method is used for qualitative and quantitative analysis and detection of the circulating tumor cells, realizes bimodal signal response to the circulating tumor cells, and has high sensitivity and simplicity and convenience in operation.

The invention belongs to the technical field of preparation and surface protection of polyurethane coatings, and particularly relates to weather-resistant polyurethane and a preparation method thereof. The coating provided by the invention is composed of a component A and a component B according to a weight ratio of 1: (0.2-0.4). The component A is prepared from water-based fluorine-containing hydroxy acrylic dispersion resin with a high hydroxyl value, GMA (glycidyl methacrylate) grafted modified water-based acrylic dispersion resin, a benzotriazole ultraviolet light absorber, a light hindered amine stabilizer, rutile titanium dioxide, wet sericite powder, nano zinc oxide and auxiliaries; and the component B comprises an aliphatic isocyanate curing agent and propylene glycol diacetate. By constructing a quadruple synergistic weather-resistant mechanism of ultraviolet absorption, free radical capture, physical shielding and structural densification, the weather resistance and corrosion resistance of the coating are remarkably improved while the coating keeps excellent adhesive force (0-1 level) and hardness (2H-3H), the color change delta E is smaller than or equal to 1.8 after artificial accelerated aging for 1000 hours, the gloss loss rate is smaller than or equal to 23%, and the weather resistance and corrosion resistance of the coating are greatly improved. And the corrosion spreading width of a 600-hour salt spray test lineation is less than or equal to 2.3 mm.

The invention relates to a biaxially oriented casting polypropylene composite film and a preparation method thereof, and belongs to the technical field of packaging materials. The homo-polypropylene, the co-polypropylene, the slipping agent, the nucleating agent, the antioxidant and the modified nano silicon dioxide are used as raw materials to prepare the biaxially oriented casting polypropylene composite film which can be used in the field of food packaging and has high transparency and good antistatic performance and ultraviolet resistance. The nano silicon dioxide is modified, and the ultraviolet light absorber is grafted on the surface of the nano silicon dioxide, so that the problem that the nano silicon dioxide is easy to agglomerate is solved, and the problem that the ultraviolet light absorber is easy to migrate is also solved; through quaternary ammonium salt structure conjugation, the ultraviolet light absorber has better ultraviolet light absorption performance and antistatic performance.

Provided are a novel ultraviolet absorber that has an excellent absorbing property for UV-A or UV-B, furthermore specifically absorbs only ultraviolet ray at a specific wavelength, and is capable of being used for general purposes, and an ultraviolet absorbing resin excellent in bleed-out resistance in addition to the characteristics described above. The ultraviolet absorber is a fluorene compound represented by the general formula (1) or a resin comprising the fluorene compound as a constituent unit.

The present disclosure relates to compositions including a light absorbing system including bemotrizinol and iron oxide, as well as to methods of making and using such compositions.

The invention relates to the technical field of water treatment, and discloses a central air-conditioning condensate water disinfection and purification device which comprises a treatment tank main body, an ozone generator and an ozone generator real-time regulation and control system. According to the system, a demand coefficient is dynamically obtained based on residual ozone concentration and ultraviolet absorbance through a pollution load evaluation module; the ozone mass transfer efficiency evaluation module calculates a mass transfer efficiency coefficient based on the tail gas and inlet gas ozone concentration and the gas flow; the matching evaluation module combines the demand coefficient, the mass transfer efficiency coefficient and the water temperature influence factor to generate a matching factor; the generator health monitoring module evaluates a health degree coefficient based on parameters such as air inlet pressure; and the power comprehensive decision-making module fuses the health degree coefficient and the matching factor, and outputs a target power set value through a multi-parameter regulation and control model. The intelligent sensing and dynamic optimization of ozone feeding are realized, the problems of traditional control stiffness, low mass transfer efficiency and insufficient equipment guarantee are solved, and the energy utilization rate and the operation reliability are improved while the disinfection effect is ensured.

To provide a polarizing film with an adhesive layer, which can solve a problem of decrease in a yield, can impart a sufficient function of blocking UV rays even when a polarizing film is thin, and can suppress curling, and to provide an image display device using the polarizing film with an adhesive layer.SOLUTION: A polarizing film 1 with an adhesive layer is to be used on a visible side of an image display part in an image display device; and the polarizing film 1 with an adhesive layer includes a polarizing film 5 and adhesive layers 2a, 2b on both surfaces of the polarizing film 5. The polarizing film 5 includes a polarizer 4 and transparent protective films 3a, 3b on both surfaces of the polarizer. The transparent protective film 3a on a visible side of the polarizer 4 has a transmittance of less than 6% at a wavelength of 380 nm; and the adhesive layer 2a on a visible side of the polarizing film 5 has an ultraviolet absorption function.SELECTED DRAWING: Figure 1

The invention discloses alcohol-resistant aging-resistant waterborne polyurethane and a preparation method thereof.The alcohol-resistant aging-resistant waterborne polyurethane is of a unique core-shell structure, a core layer is fluorine-containing polyurethane and is prepared through a reaction of fluorine-containing polyol, polyisocyanate and the like, the molar ratio of the fluorine-containing polyol to the polyisocyanate is 1: 2-1: 4, and a double-bond-containing chain extender is introduced; the shell layer is an acrylate copolymer containing an ultraviolet absorption monomer, the ultraviolet absorption monomer accounts for 10-40%, the shell layer further contains a multifunctional cross-linking agent, the shell layer is formed by compounding at least two acrylate monomers with different polarities, the core and the shell are connected through chemical bonds, and bonding is enhanced through a silane coupling agent KH-570. The preparation process comprises the steps of fluorine-containing polyurethane core layer preparation, neutralization and pre-dispersion, shell layer polymerization, post-treatment and the like. The prepared waterborne polyurethane has greatly improved alcohol wiping resistance and excellent xenon lamp aging resistance, and can be widely applied to the fields of automotive interiors, consumer electronics coatings and the like.

The present application relates to thermal insulation coating technical field, specifically to a kind of low VOCs ultraviolet resistant thermal insulation coating composition and its performance testing device, consisting of the following mass parts components: water-based acrylic resin 30-45 parts, nitrogen-doped graphene 1-3 parts, nano composite powder 2-5 parts, low water absorption and expansion glass microsphere 8-12 parts, silane coupling agent modified sepiolite 5-10 parts, silane coupling agent KH560 0.5-1.5 parts, ultraviolet absorber UV-9 0.3-0.8 parts, hydroxyethyl cellulose thickening agent 0.2-0.5 parts;Composition meets the following conditions: (1) VOCs content≤50g / L;(2) ultraviolet absorption rate≥95%;The present application realizes the purpose that VOCs content is far lower than traditional solvent type coating through the synergistic effect of water-based acrylic resin system and low water absorption and expansion glass microsphere, while nitrogen-doped graphene and nano ITO-SiO2 Composite powder form ultraviolet-infrared dual-effect shielding layer, ultraviolet absorption rate, infrared reflectivity greatly improve, solve the problem that traditional anti-UV coating function is single, VOCs is overproof.

Provided is a primer composition that contains: (A) a copolymer (A-1) which contains a constituent unit represented by the formula shown below and which does not contain a prescribed ultraviolet radiation-absorbing group (R1 denotes a hydrogen atom or the like, R2 denotes a monovalent hydrocarbon group or the like, R4 denotes a hydrogen atom or the like, R5 and R6 each denote an alkyl group or the like, X2 denotes an alkyleneoxycarbonyl group or the like, n denotes an integer between 1 and 3, and * denotes a bond to an adjacent constituent unit); a vinyl-based (co)polymer (A-2) which does not contain an alkoxysilyl, does not contain a prescribed ultraviolet radiation-absorbing group, and has a glass transition point of 80°C or higher; an ultraviolet radiation absorber (B); a compound (C) having a cyclic hindered amine structure; inorganic particles (D) having a median diameter of 100 nm or less; and a solvent (E). The (A-1) : (A-2) mass ratio is 3:1 to 1:3.

The present invention addresses the problem of providing an optical film having excellent ultraviolet absorbency, excellent alignment properties of a liquid crystal compound in an optically anisotropic layer, and excellent adhesion between an alignment film and the optically anisotropic layer. The optical film according to the present invention comprises an alignment film and an optically anisotropic layer disposed adjacent to the alignment film, the optically anisotropic layer being formed using a composition containing a liquid crystal compound, and the alignment film containing particles containing an ultraviolet absorber and a cured product of a polymerizable compound having a polymerizable group, the average particle diameter of the particles is 500 nm or less, and the maximum absorption wavelength of the ultraviolet absorber is within the range of 320-400 nm.

The invention discloses a dosing system for removing algae through pre-chlorination enhanced coagulation and a refined intelligent regulation and control method, and belongs to the technical field of water treatment. The system comprises a raw water pump, a tubular static mixer, a flocculation basin, a sedimentation basin, an industrial personal computer and multiple online detectors, and is used for monitoring flow, temperature, turbidity, characteristic fluorescence peak intensity, ultraviolet absorbance and organic matter concentration. On the basis of integrated real-time sensing data, by monitoring the characteristic fluorescence intensity ratio of algae cells after pre-chlorination and before flocculation, the dosage of an oxidizing agent (available chlorine) and a coagulant is finely and intelligently regulated and controlled on the premise of ensuring the integrity of the algae cells and enhancing coagulation. Under different water quality conditions, the system shows good self-adaptive capacity, accurate adding of an oxidizing agent (available chlorine) and a coagulant is achieved by applying a dynamic adjustment algorithm, the effluent quality is guaranteed, and the medicine consumption is reduced.

The present invention refers to a process for producing white UV-absorbing surface-reacted calcium carbonate doped with a titanium species, comprising the steps of providing a calcium carbonate-comprising material, a calcium phosphate selected from monocalcium phosphate and / or dicalcium phosphate, and at least one titanium comprising substance, treating the calcium carbonate-comprising material with the calcium phosphate in an aqueous medium to form an aqueous suspension and grinding the aqueous suspension at a pH value of at least 4.2 to form an aqueous suspension of surface-reacted calcium carbonate, wherein the calcium carbonate-comprising material and the calcium phosphate in combination have a calcium ion to phosphate ion molar ratio (Ca2+:PO43−) in the range from 1.75:1 to 100:1, and wherein the at least one titanium comprising substance is added before and / or during and / or after the treatment step and / or before and / or during the grinding step.

The application discloses a kind of ultraviolet absorber with triazine ring as main structure and its preparation method and its application in aramid fiber, the ultraviolet absorber has the following structural formula: Wherein, R1, R2, R3, R4 It is the group containing phenyl or substituted phenyl, R5 It is piperidyl, piperazyl, pyrrolidinyl and one of the following structures:This ultraviolet absorber has good absorption to UVA-UVB band ultraviolet, especially in 290~320 nm range has good ultraviolet absorption, adding the ultraviolet absorber in aramid fiber can significantly improve its weather resistance and service life, keep mechanical property, delay ultraviolet degradation, reduce the direct damage of fiber.

A component processing method is provided that can prevent damage to the workpiece (component, etc.) even when a rigid substrate is peeled off from the workpiece. The component processing method of the present invention includes: a lamination step in which a rigid substrate, an ultraviolet absorbing layer, and a workpiece are sequentially laminated; a processing step in which the workpiece is processed; and a peeling step in which the ultraviolet absorbing layer is irradiated with ultraviolet light to peel the rigid substrate off from the workpiece.

This invention discloses a composite transparent film and its preparation method, relating to the technical field of polymer materials. The preparation method of the composite transparent film includes the following steps: (1) melting and blending vermiculite and fluororubber to obtain fluorinated vermiculite; then mixing the fluorinated vermiculite and mica evenly to obtain composite clay; (2) mixing polyvinyl alcohol solution, composite clay, and SESC lignin evenly to obtain a precursor solution, wherein the mass ratio of polyvinyl alcohol, composite clay, and SESC lignin is 45:45:(8-12); then spreading and drying the precursor solution on a substrate by casting, followed by heat treatment to obtain the composite transparent film. The composite transparent film of this invention possesses excellent water vapor barrier properties, ultraviolet absorption capacity, good transparency, high mechanical strength, and weather resistance.

The application relates to the technical field of ultraviolet absorbing materials, and discloses a preparation method of a composite ultraviolet absorbing agent, which comprises the following components in percentage by weight: 50-70% of an ultraviolet absorbing agent, 10-20% of a light stabilizer, 5-15% of an antioxidant, 2-5% of a dynamic crosslinking agent, and 0.5-2% of an auxiliary additive. The preparation method comprises the following steps: dissolving the ultraviolet absorbing agent, the light stabilizer and the antioxidant in a mixed solvent to stir and form a uniform solution, adding the dynamic crosslinking agent to perform crosslinking reaction, then removing the solvent by vacuum evaporation, and grinding and drying to obtain the target product. The composite ultraviolet absorbing agent is prepared through the synergistic effect of the components and the construction of a dynamic crosslinking network, the ultraviolet absorbing performance, the chemical stability, the thermal stability and the low migration property are remarkably improved, and the composite ultraviolet absorbing agent can be widely applied in the fields of plastics, coatings, textiles and the like.

The invention relates to a preparation method of a high-performance ink material for a writing pen, and belongs to the technical field of ink materials. The high-performance ink material for the writing pen is obtained by self-making the modifier and blending the modifier with the pigment and other auxiliaries, and the modifier connects the benzotriazole with the hydroxypyridine, so that a conjugated system is expanded, the ultraviolet absorption strength of the modifier is higher, the efficiency is higher, and the ink material is more suitable for the writing pen. Ether introduced by pyridine can be used as a hydrogen bond acceptor to form a hydrogen bond with resin in an ink system, so that the ultraviolet light absorber is prevented from being separated out; quaternary ammonium salt cations in the modifier can improve the adhesive force and color fastness of the ink and the friction resistance and water resistance after writing; meanwhile, tert-butyl in the modifier reduces surface tension through steric hindrance, promotes leveling of ink and ink mark uniformity and enhances dispersion stability among resin, auxiliaries and pigment, so that the ink is not prone to layering and deterioration after being placed for a long time.

This application provides a method for preparing gallium oxide (GaO) with enhanced ultraviolet absorbance and a GaO material prepared according to this method. First, a GaO thin film capable of generating ultraviolet absorption is grown on a substrate by magnetron sputtering. The GaO thin film is then annealed. Next, a copper thin film is grown on the GaO thin film by magnetron sputtering, followed by rapid annealing, causing the copper film to crack into copper nanoparticles under heat. This preparation method utilizes copper nanoparticles to enhance the ultraviolet absorption performance of GaO. The process steps are simple and easy to operate, thus effectively reducing the preparation cost. Furthermore, the GaO material prepared by this method shows a significant improvement in ultraviolet absorbance.

The invention discloses a colorimetric detection method for cMyBP-C protein based on nano-enzyme activity, preparation of a bismuth selenide / nano-gold composite material and application of the bismuth selenide / nano-gold composite material in protein detection. The method comprises the following steps: performing ultrasonic stripping on a bismuth selenide block to obtain a few-layer bismuth selenide dispersion liquid; and then sequentially adding a sodium borohydride aqueous solution and a chloroauric acid aqueous solution under a stirring condition, and carrying out in-situ reduction to form gold nanoparticles loaded on the surface of bismuth selenide. The composite material has the capability of catalyzing reduction of p-nitrophenol into p-aminophenol, and the color of the solution is changed from yellow to colorless. After the cMyBP-C antibody is modified on the surface of the composite material, the catalytic activity is inhibited; after a to-be-detected sample is added, the antibody and the protein are specifically combined to cause dissociation, and the catalytic activity is recovered. The cMyBP-C protein is quantitatively detected by observing the color change of the solution or monitoring the reduction of the ultraviolet absorbance at 400 nm.

The aim of this invention relates to underwater paint which can be used on dry, wet, or underwater surfaces. An epoxy resin, barium sulfate and talcum as filler, and amine curing agent are major compositions. UV absorber, light stabilizer and leveling agent are also added to improve the coating properties. This epoxy paint in this invention provides good adhesion, corrosion protection and chemical resistance on steel surface.

The present application relates to the technical field of paint, and discloses a preparation method of a spherical alumina-cordierite composite refractory paint composition, wherein 100 parts by weight of epoxy resin, 1-5 parts by weight of an amino-terminated polymer ultraviolet absorber, 15-28 parts by weight of a filler spherical alumina trihydrate and cordierite, 29-32 parts by weight of a curing agent and the like are stirred and uniformly mixed to obtain the spherical alumina-cordierite composite refractory paint composition.The polymer ultraviolet absorber contains an ortho-hydroxybenzotriazole group, which can improve the ultraviolet absorption characteristics and ultraviolet aging resistance of the paint.The polymer, as an absorber, contains a biphenyl structure with thermal stability, which is beneficial to improving the thermal decomposition temperature, heat resistance and water resistance after being co-cured with the epoxy resin.The addition of the spherical alumina trihydrate and cordierite improves the limiting oxygen index of the paint coating and improves the flame-retardant fire resistance.

Compositions Containing a UV Absorbing System Including a UV Attenuating Physical Material and an Oil to Inhibit Aggregation of the UV Attenuating Physical Material. This disclosure relates to compositions including a UV absorbing system comprising at least one ultraviolet (UV) attenuating physical material and at least one oil to inhibit the aggregation of the ultraviolet (UV) attenuating physical material, as well as processes for preparing and using such compositions. Figure for abstract: none

A thermoplastic molding composition P comprising: AB: at least one graft copolymer composition AB, consisting of at least one thermoplastic copolymer A and at least one graft copolymer B; C: at least one UV absorber as component C; and D: optionally at least one further additive as component D, wherein the UV absorber component C comprises at least one organic or inorganic component having an UV absorption at least in a wavelength range ≤380 nm; and wherein the UV absorber component C is at least partially selected from at least one black pigment, at least one white pigment and / or at least one dye having an UV absorption at least in a wavelength range ≤380 nm.

The present disclosure relates to compositions including a UV absorbing system including at least one physical ultraviolet (UV)-attenuating material, at least two polyols, and at least one anionic polysaccharide thickening agent, as well as to methods of making and using such compositions.