27results about How to "Avoid yellowing" patented technology

This invention relates to the field of polymer material synthesis technology, specifically to a modified PVB resin and its preparation method. The invention introduces a fluorinated acetal monoaldehyde derivative containing fluorine into the PVB resin. This derivative is mixed with n-butyraldehyde and glyoxal, thereby undergoing an acetalization reaction with the 1,3-o-diol structure of the PVB molecular chain, incorporating the fluorinated side link into the PVB molecular chain. Utilizing the high electronegativity and high C-F bond energy of fluorine atoms, it shields against the intrusion of external corrosive media, inhibits oxidative yellowing, and improves weather resistance. Furthermore, the invention introduces glyoxal as a crosslinking agent, containing dialdehyde groups, which can react between adjacent polyvinyl alcohol segments, causing slight crosslinking between the originally linear PVB resin segments, improving the resin's shielding performance, further reducing the intrusion of external corrosive media, and enhancing the stability of the PVB resin.

The application discloses a fabric yellowing reagent and a fabric yellowing method, and relates to the technical field of daily chemical products. 5 The fabric yellowing reagent comprises 1-3% of histidine solution and a bacterial suspension with a bacterial concentration of 1*10 5 CFU / mL-9*10 The bacteria are a mixture of one or more of Staphylococcus epidermidis and Micrococcus luteus; the solvent of the histidine solution is normal saline containing 0.15-1% of trypsin peptone; and the solvent of the bacterial suspension is normal saline containing 0.1-0.2% of trypsin soybean peptone liquid culture medium. The fabric yellowing reagent can be used for simulating fabric yellowing, and has good operability, reproducibility and data reliability.

This invention discloses a dual-mode synergistic composite photocatalyst, its preparation method, and its application in styrene-acrylic emulsion coating compositions, belonging to the field of architectural coating technology. The dual-mode synergistic composite photocatalyst possesses a TiO2@dense SiO2@mesoporous SiO2-MnO2-GQDs three-layer core-shell structure. The styrene-acrylic emulsion coating provided by this invention utilizes the aforementioned dual-mode synergistic composite photocatalyst, and innovatively employs a yellowing-resistant composition composed of hollow titanium dioxide-supported phenyltriazole particles, a sulfonic acid-grafted hindered amine light stabilizer, and nano-zinc oxide. This composition synergistically inhibits yellowing of the paint film through enhanced UV absorption and improved interfacial compatibility. The styrene-acrylic emulsion coating provided by this invention successfully solves the two major problems of traditional photocatalytic coatings: "purification depends on light" and "self-catalysis leads to yellowing of the paint film." It can efficiently degrade formaldehyde under both light and dark conditions and exhibits excellent yellowing resistance.

The application discloses a kind of high weather-proof outer wall special-purpose inorganic stone gel and its preparation process and a kind of inorganic stone preparation process, the inorganic stone gel includes the following weight parts components: geopolymer precursor 35-50 parts;Sulfoaluminate clinker 25-45 parts;Alkali activator 15-17 parts;Nano titanium dioxide 1-4 parts;Hollow glass bead 2-8 parts;Basalt-PVA composite fiber 1.3-1.9 parts;Anti-alkali bleeding stabilizer 0.25-0.8 parts.The beneficial effects of the application are: carbonization resistance, yellowing resistance, long-term ultraviolet aging resistance, low water absorption, excellent impermeability, excellent freeze-thaw resistance, crack resistance and impact resistance, long weathering life, suitable for all scenarios, suitable for industrial production.

The application discloses a preparation method of hydrogenated aldehyde ketone resin without free formaldehyde, belongs to the technical field of aldehyde ketone resin synthesis, and aims to solve the technical problems of high free formaldehyde content, and further improved hydroxyl value stability and transparency in the hydrogenated aldehyde ketone resin in the prior art, and specifically comprises the following steps: under the protection of an inert gas atmosphere, phenylacetone, polyformaldehyde and a solvent are mixed and stirred, the reaction system is heated to 60-75 DEG C, and an inorganic alkali is added into the reaction system. The application is characterized in that the basic aldehyde ketone resin solution prepared by condensation of polyformaldehyde and phenylacetone in a water-free environment with a nickel catalyst is catalytically hydrogenated, not only the hydrogenated aldehyde ketone resin with stable hydroxyl value and extremely low colority is effectively obtained, but also the free formaldehyde content in the hydrogenated aldehyde ketone resin is effectively reduced, and the wide applicability of the hydrogenated aldehyde ketone resin in high-end coatings, adhesives and electronic materials is improved.

The utility model discloses a composite humidification filter screen piece and a humidifier. The composite humidification filter screen piece comprises a first humidification filter screen piece and a second humidification filter screen piece, the second humidifying filter screen piece is connected with the first humidifying filter screen piece, the second humidifying filter screen piece comprises a filtering base body and an adsorption piece, and the adsorption piece comprises an activated carbon piece, an ion exchange resin piece, a molecular sieve piece, a metal organic framework piece, a porous silica gel piece or a porous ceramic piece. When fluid flows through the second humidifying filter screen piece, the adsorption piece is suitable for adsorbing impurities to remove color. According to the composite humidification filter screen piece, the common humidification and impurity removal functions are achieved, pollutants causing yellowing and stinking of a water body in the water body can be removed, and the functions are rich. When the composite humidification filter screen piece is used for the humidifier, the problems of yellowing, stinking and the like of water stored in a water tank can be solved, and the use performance of the humidifier is improved.

The utility model discloses a high beam light guide piece, installation structure and car lamp, including light guide piece body, light guide piece body is made of silica gel material integral injection moulding, light guide piece body includes the light entrance portion that is provided at one end, light guide piece body other end is provided with the light exit portion, light guide portion is provided between light entrance portion and light exit portion, light guide portion is columnar silica gel rod, the silica gel rod is cylindrical silica gel rod, the silica gel rod is cylindrical silica gel rod, the silica gel rod is cylindrical silica gel rod, and the silica gel rod is cylindrical silica gel rod. The light inlet portion comprises a funnel-shaped cavity located at one end of the light guide portion, the cavity bottom of the funnel-shaped cavity is fixedly connected with a protruding light inlet protrusion, the light guide piece body of the high-distance light guide piece is integrally formed by the silica gel material in an injection molding mode, the silica gel material has good flexibility and formability, the light guide piece has a proper refractive index, and therefore the light guide piece body is not prone to falling off. Light rays can be effectively guided to be transmitted inside, light loss is reduced, yellowing or aging is avoided, meanwhile, the silica gel can be rapidly made into a light guide piece of a proper size through injection molding, ejection and other forming methods, large-scale production can be achieved, efficiency is improved, and cost is reduced.

This utility model discloses an acrylic resin liquid filling device, relating to the field of acrylic resin liquid filling. It includes a placement box, a delivery pipe, a delivery pump, a container, an air blowing mechanism, and an air supply mechanism. The delivery pipe is fixedly connected to the upper left end of the placement box, and the delivery pump is fixedly connected to the delivery port of the delivery pipe. A container is fixedly connected to the bottom left end of the delivery pipe, and an air blowing mechanism is provided on the left side of the container. An air supply mechanism is fixedly connected to the top of the placement box. The air blowing mechanism uses two sets of nozzles to deliver external hot air to the outer wall of the delivery pipe, maintaining a suitable working temperature for the acrylic resin liquid and preventing the acrylic resin liquid from experiencing a decrease in flow rate due to low temperature, incomplete filling, or equipment overload. The air supply mechanism delivers nitrogen gas into the placement box, replacing the air at the top of the box to create an oxygen-free environment, preventing the acrylic resin liquid from increasing in viscosity and turning yellow.

The invention relates to an ultraviolet-blue light absorbent as well as a preparation method and application thereof, the absorbent provided by the invention has strong absorption performance in ultraviolet and blue light regions, is good in high temperature resistance and weather resistance, can absorb high-energy ultraviolet light and blue light in protective films of glasses, mobile phones, televisions and the like, and plays a role in protecting eyesight. Meanwhile, the ultraviolet-blue light absorbent is simple in preparation method, short in production period and high in practicability, and is an environment-friendly absorbent with excellent application performance.

The application relates to the technical field of compound fertilizer, and particularly discloses a special fertilizer for wormwood and a preparation method thereof. The special fertilizer comprises the following components: 500-600 parts of straw humic organic fertilizer, 60-100 parts of humic acid, 30-50 parts of amino acid raw powder, 40-50 parts of ammonium sulfate, 80-90 parts of monoammonium phosphate, 60-65 parts of potassium sulfate, 10-20 parts of calcium carbonate, 10-15 parts of magnesium sulfate, 1-3 parts of boric acid, 1-5 parts of ferrous sulfate, 1-5 parts of manganese sulfate and 30-35 parts of bio-based polyurethane. The bio-based polyurethane coating agent is prepared by using bio-based PDI and castor oil-based polyol as raw materials, and by adopting a chain extension agent and a grafting monomer for chain extension, and the special fertilizer after coating treatment can effectively solve the shortcomings of easy caking and inconvenient storage, and can realize accurate supply of nutrients through slight slow release. Meanwhile, the bio-based coating can be naturally degraded, has no soil residue, does not damage soil structure, does not affect the quality of wormwood medicine, can improve the utilization rate of fertilizer nutrients, and can reduce nutrient loss.

The utility model discloses an automatic rolling equipment for tea processing belongs to tea rolling equipment technical field. A kind of automatic rolling equipment for tea processing, including rack and the equal-distance arrangement of connecting rod assembly on rack annular, connecting rod assembly is fixedly installed with mounting ring, adjusting assembly is provided on mounting ring, adjusting assembly is fixedly installed with bucket cover, the rolling disc is fixedly installed on the rack, the heat dissipation cylinder is fixedly installed on the mounting ring, heat dissipation cylinder is provided with rolling cylinder, and heat dissipation zone is formed between rolling cylinder and heat dissipation cylinder, and spiral air deflector is provided in heat dissipation zone, and connecting hole is formed in air deflector, and air inlet hole of annular arrangement is formed on heat dissipation cylinder, and air inlet hole is communicated with heat dissipation zone;The utility model uses heat dissipation cylinder and air deflector cooperation to guide the air outside equipment to heat dissipation cylinder and make flowing air downward to tea, to reduce tea temperature, avoid tea temperature to rise and ferment in advance.

The application discloses a preparation method and application of high-performance key-use precipitated liquid silicone rubber base material and belongs to the field of preparation of precipitated silicone rubber. Vinyl-terminated polydimethylsiloxane, dihydric alcohol and a release agent are mixed and then kneaded to obtain a mixture; the vinyl-terminated polydimethylsiloxane, the mixture, high-hydroxyl-value hydroxyl silicone oil and precipitated white carbon black are put into a closed kneader, the kneading is started and the temperature is raised to 80-120 DEG C, the temperature is raised to 130-180 DEG C after the rubber material is densely kneaded into a lump, the constant-temperature kneading is carried out and vacuum kneading is carried out; the material is discharged after cooling, the prepared precipitated liquid silicone rubber base material has fluidity and a translucent appearance. The process is a two-step method for preparing the precipitated liquid silicone rubber base material, the yellowing problem of the base material is avoided, and the translucent base material can be stably prepared; the dispersion effect of the white carbon black in the base material is better, the structural degree is low and the viscosity change rate is small after six months of storage; the mechanical properties after vulcanization are excellent, and the base material can be applied to the field of keys.

The present application belongs to the technical field of detergent, and particularly relates to a green and environment-friendly multi-effect school uniform special dipping powder composition and application thereof. The green and environment-friendly multi-effect school uniform special dipping powder composition provided by the present application comprises the following components and mass percentages thereof: 30-60% of sodium percarbonate, 5-20% of anhydrous sodium metasilicate, 0.5-8% of non-ionic surfactant, 0.5-8% of zwitterionic surfactant, 0.5-5% of anionic surfactant, 0.2-0.5% of anti-redeposition agent, 0.2-1% of composite chelating agent, 0.6-4% of composite enzyme preparation, 0.05-8% of auxiliary agent, and the rest is sodium carbonate, and the sum of the mass percentages of the above components is 100%. The present application can be used without high-temperature dissolution of more than 60 DEG C or even 80 DEG C, can effectively protect the fabric, prevent the fabric from being damaged, and achieve the protection of the fabric while achieving the strong cleaning of stains, efficient whitening, dry deodorization and prevention of excessive cleaning.

The present application aims to provide a sheet having high transparency, suppression of yellowing caused by heating, and high tensile elastic modulus, and also excellent softness, and a laminate having the sheet. The sheet of the present application contains microfine fibrous cellulose having a fiber width of 10 nm or less, and a cellulose derivative having a weight average molecular weight of 1.0 x 10 4 3.0 x 10 5 the following cellulose derivative.

The application provides a sealant and a preparation method thereof, and relates to the technical field of sealants. The sealant comprises A component and B component. The A component comprises the following raw materials: bio-based polyaspartic ester resin, modified nano zinc oxide, tea polyphenol microcapsule, filler, dispersant and defoaming agent. The B component comprises the following raw materials: bio-based isocyanate prepolymer, HDI trimer, catalyst and light stabilizer. The sealant provided by the application has the comprehensive performances of weather resistance, anti-yellowing, mechanical balance, environmental protection, safety, antibiosis and durability, and is suitable for the sealing of building gaps in the environment exposed to light and moisture for a long time.

The invention provides a bleaching control process for low-DCM extract sulfate hardwood pulp, and relates to the technical field of pulping and papermaking. By adjusting an existing pulping four-section bleaching process, the using amount of hydrogen peroxide in the EOP section and the using amount of chlorine dioxide in the D1 section are increased, chlorine dioxide in the D2 section is stopped, the using amount of chlorine dioxide in the front section of pulp papermaking is reduced, DCM extract rising from D2 wet pulp to a finished product pulp board is avoided, low-level control over the stable content of DCM extract in the pulp board product is achieved, and the production efficiency is improved. And the whiteness of the pulp board reaches 89.5% ISO or above, and the pulp board can meet the requirements of high-whiteness paper such as paper for daily use and the like.

The application discloses an anti-inflammatory and antioxidant composition and a preparation method and application thereof, and relates to the technical field of cosmetics. The anti-inflammatory and antioxidant composition comprises the following components: an enzymatic biota orientalis extract and at least one of ginkgo biloba extract, mulberry leaf extract, bayberry leaf extract and sophora flower extract; the enzymatic biota orientalis extract is prepared through an enzymatic reaction of a biota orientalis extract, an enzyme activator and a redissolving system; the enzyme activator is selected from at least one of the following: beta-glucosidase from aspergillus niger, beta-glucosidase from apricot, cellulase complex enzyme, malt extract and citrus fruit fermentation liquor; and the redissolving system comprises a moisturizing stabilizer, a chelating agent, a buffer system and deionized water. The anti-inflammatory and antioxidant composition and the preparation method and application thereof have the effects of anti-inflammation, antioxidation and scalp barrier repair, and realize multi-effect synergy.

The application discloses a self-hydrogen-supplying chalcone photoinitiator and application thereof in preparation of white photosensitive ink, wherein the structural general formula of the self-hydrogen-supplying chalcone photoinitiator is shown in the following formula: The self-hydrogen-supplying chalcone photoinitiator has strong absorption in the ultraviolet to visible light region, and has the characteristics of photobleaching and self-hydrogen supply. When the self-hydrogen-supplying chalcone photoinitiator is applied to preparation of the white photosensitive ink, a thick film with high reflectivity, no yellowing and excellent curing effect can be obtained. The photoinitiator has high initiation efficiency, small dosage, simple synthesis and is suitable for industrial production. The product can be used in LED and miniLED backlight structures with high reflectivity requirements.

This invention relates to a salt spray resistant and anti-aging curing coating and its preparation method, belonging to the field of coating technology. The coating includes modified epoxy resin, ternary nanocomposite filler, composite light stabilizer, hydrophobic eutectic solvent, polysiloxane-modified aromatic amine curing agent, and bio-based polyurethane curing agent. The modified epoxy resin is prepared by reacting bisphenol F epoxy resin, KH-560 silane coupling agent, and tetrabutylammonium bromide, followed by the addition of bi-terminated epoxy silicone oil, 3,3'-dithiodipropionic acid, and p-toluenesulfonic acid, and then by adding pentaerythritol phosphate and antioxidant 1010. The polysiloxane-modified aromatic amine curing agent is prepared by reacting m-phenylenediamine as a matrix, KH-560 silane coupling agent, diphenylsilanediol, and dibutyltin dilaurate. The bio-based polyurethane curing agent is prepared by reacting castor oil-modified polyol, isophorone diisocyanate, dibutyltin dilaurate, dimethylolpropionic acid, and trimethylolpropane.

The present application relates to a pre-coating solution for optical film, a pre-coated optical film and application, wherein the solution comprises a water-based polyurethane resin, the chain extender used by the water-based polyurethane resin comprises at least a carboxylic acid derivative containing amide and unsaturated double bond, and the carboxylic acid derivative containing amide and unsaturated double bond is selected from at least one of N-(2,3-dihydroxypropyl) maleic amide acid and N-(2,3-dihydroxypropyl) acrylamide. The pre-coating layer formed on the surface of the film substrate by using the solution can simultaneously realize stable adhesion in high temperature and high humidity environment, excellent optical performance, high compatibility with various functional coatings and online production adaptability; moreover, the main chain of the pre-coating layer is mainly ether bond / amide bond, has no easy hydrolysis structure, is long-term wet heat stable and scratch-resistant, and can be adapted to various downstream composite processing processes.

The application discloses a method for preventing cigarette white cardboard from yellowing, which prevents the cigarette white cardboard from yellowing by controlling the surface-core layer gram weight ratio of the cigarette white cardboard, and the surface-core layer gram weight ratio ranges from 0.6 to 1.1; and the application also provides a detection method for the surface-core layer gram weight ratio of the cigarette white cardboard. The method for preventing the cigarette white cardboard from yellowing and the detection method are simple and easy to operate, and the cigarette white cardboard can be prevented from yellowing by controlling the surface-core layer gram weight ratio.

The invention discloses a preparation method of copolyesteramide, which comprises the following steps: (1) putting dibasic acid and dihydric alcohol into a reaction kettle according to the molar ratio of carboxylic acid group to alcoholic hydroxyl group of (2.0-2.1): 1, and carrying out esterification dehydration reaction at 150-190 DEG C for 2-3 hours; performing reduced pressure distillation to remove redundant dihydric alcohol and by-products to obtain ester group-containing dicarboxylic acid; (2) putting dibasic acid, the ester group-containing dicarboxylic acid, aliphatic diamine, lactam, a stabilizer, an end-capping reagent and other auxiliaries into a salifying kettle, and carrying out polymerization reaction at 220-250 DEG C under 1.0-1.8 MPa for 3-5 hours; then vacuumizing until the melt index is 35 to 40g / 10min; and (3) releasing the vacuum, and discharging while hot to obtain the copolyesteramide. According to the invention, the molecular weight and molecular weight distribution of copolyamide can be controlled, so that the whole molecular chain structure is uniform, and collaborative optimization of polyester and polyamide performance is realized to the greatest extent.

The utility model relates to the field of plastic processing discloses a polyformaldehyde granule dryer with drainage device, including by flange connection in proper order feed section, drying section, cooling section and discharge section constitute drying cooling main part, drying cooling main part outside is provided with tail gas treatment subassembly and vibration subassembly, the inside of feed section is provided with cloth structure and lower feed port, and high low material level switch is installed on its side wall, the inside fixed connection of drying section has the heating plate group of heating source inlet and outlet subassembly, the inside fixed connection of cooling section has the cooling plate group of cold -source inlet and outlet subassembly, the even wind subassembly is provided between cooling section and discharge section. In the utility model, integrate drying and cooling procedure in vertical equipment, realize continuous production, reduce equipment space and investment, adopt plate indirect heat exchange, avoid material pollution, ensure purity, and accurate control temperature, prevent product degradation or yellowing, guarantee high quality.

The invention provides bisphenol A type low-molecular-weight polycarbonate polyether polyol and a production process thereof, and relates to the technical field of chemistry and chemical engineering. The production process is carried out in an integrated tubular reaction device, and comprises the following steps: premixing the epoxy compound, CO2, bisphenol A and a catalyst, and feeding the mixture into a reaction pipeline at one time to carry out polymerization reaction. In the polymerization reaction process, slow heating control and gas pressurization compensation are carried out, so that the molecular weight polydispersity index PDI of the bisphenol A type low-molecular-weight polycarbonate polyether polyol does not exceed 1.5, the carbonic ester chain link proportion FCO2 is greater than 55%, and in the Lab color system, the b value does not exceed 0.1. Through the regulation and control process, the problem of yellowing of the product generated in the one-step preparation process of the bisphenol A type low-molecular-weight polycarbonate polyether polyol can be solved, and the production efficiency is high. And the prepared product is narrow in molecular weight distribution, does not generate implosion, has no amplification effect, and is suitable for industrial large-scale production.

This invention relates to the field of preparation technology of terephthalic acid dicamphor sulfonate organic amine salt, and particularly to a method for synthesizing terephthalic acid dicamphor sulfonate organic amine salt, comprising the following steps: neutralizing camphor sulfonic acid with an organic amine compound in a solvent to generate camphor sulfonate organic amine salt; and condensing camphor sulfonate organic amine salt with terephthalaldehyde under the catalysis of a non-metallic organic alkaline catalyst to obtain terephthalic acid dicamphor sulfonate organic amine salt. The method employs an organic amine neutralization and non-metallic organic alkaline catalytic system, avoiding the introduction of metal ions throughout the process. The product is terephthalic acid dicamphor sulfonate organic amine salt, and no subsequent ion exchange treatment is required, resulting in higher product safety, making it particularly suitable for high-end applications such as sunscreen cosmetics.

The application discloses a novel colorless stabilizer and a preparation method thereof, and particularly relates to the field of emulsion polymerization auxiliary agent preparation. The colorless stabilizer comprises 0.5-5% of a stabilizer, 0.5-5% of a synergist, 5-15% of an organic amine neutralization catalyst, 1-6% of a complexing agent, 25-40% of an organic solvent, 1-6% of an emulsifier, and the rest is distilled water. The novel colorless stabilizer can replace traditional ethylenediamine and other organic amines to improve the anti-blocking property, durability and adhesion of acetylacetoxy-containing acrylate emulsion. The novel colorless stabilizer can improve the hand feeling, elasticity and flexibility of the coating film or printed product, and improve the corrosion resistance and hydrolysis resistance. The novel colorless stabilizer has high quality, low production cost and simple use, and can well meet the needs of domestic textile auxiliaries, coating chemical and other acrylate emulsion production manufacturers.

This invention relates to the field of laser cutting technology and discloses a laser cutting device for copper plates used in copper crafts processing. The device includes a laser cutting machine housing and a laser cutting head. Y-axis linear motors are mounted on both sides of the top of the laser cutting machine housing, and a portal frame is positioned between the Y-axis linear motors. An X-axis linear motor is fixed to one side of the top beam of the portal frame. The laser cutting head is fixed to one end of the slide. A fixing ring is fixed to the lower half of the outer wall of the laser cutting head, and an external gear ring is fixed to the outside of the fixing ring. This invention achieves a 360° adjustable preheating and rapid cooling mechanism around the laser cutting head, allowing it to follow the cutting direction of the laser cutting head in real time. This ensures that the electric heating plate always precisely covers the area to be cut, and the hollow water-cooled housing always precisely covers the cutting area, achieving seamless integration of preheating, cutting, and rapid cooling. This maximizes the effects of preheating and rapid cooling, further improving cutting accuracy and cut quality.