37results about How to "Prevent discoloration" patented technology

The invention discloses a low-temperature storage and preservation method for litchis. The method comprises the following steps of: removing branches and leaves of fresh litchis which are 80-90% mature, and reserving bare litchis; the fruits pass through a sorting line, and defective fruits are picked out; and soaking the lychee in an ergothioneine and mannitol solution, draining water, packaging the lychee with a moisture-permeable and air-permeable functional fresh-keeping bag, and storing the lychee at the temperature of-1 DEG C to 5 DEG C. According to the fresh-keeping method combining ergothioneine, mannitol and a moisture-permeable and air-permeable functional fresh-keeping bag, the fresh-keeping period of the litchis can be effectively prolonged through natural oxidation resistance and hydration and by matching with humidity adjustment and gas exchange, and the flavor, texture and nutritional ingredients of the litchis are kept. The method not only meets green and environment-friendly requirements, but also can remarkably reduce loss of litchis in transportation and storage, reduce food waste and improve food safety, and is an advanced and efficient fruit fresh-keeping technology.

The invention discloses an anti-discoloration solid ceramic chip, a solid ceramic perfumed chip and a preparation method of the solid ceramic perfumed chip. The anti-discoloration solid ceramic chip is prepared from the following raw materials in parts by weight: 75-80 parts of powder, 7-10 parts of plant fiber, 1-2 parts of titanium dioxide, 1-2 parts of titanium dioxide, 1-2 parts of silicon dioxide, 1-2 parts of zinc oxide, 1-2 parts of mica powder, 1-2 parts of talcum powder, 3-4 parts of pressing gel, 1-2 parts of a release agent, 1-2 parts of deionized water and 1-2 parts of a dispersing agent. Tests show that the anti-discoloration solid ceramic perfumed sheet prepared by the invention can avoid the discoloration problem of aromatherapy powder caused by high temperature, essence, iron ions and the like, and compared with a common ceramic perfumed sheet, the anti-discoloration solid ceramic perfumed sheet disclosed by the invention has better color stability and aesthetic property, so that the anti-discoloration solid ceramic perfumed sheet is more competitive in the market.

The embodiment of the utility model discloses an electric toothbrush handle and an electric toothbrush. The electric toothbrush handle comprises a shell and a sealing rubber sleeve, the shell is provided with a containing cavity and an avoiding hole communicated with the containing cavity, and the avoiding hole is used for a motor shaft to penetrate through; and the sealing rubber sleeve is arranged in the avoiding hole, the sealing rubber sleeve is used for sealing a gap between the hole wall of the avoiding hole and the motor shaft, and an antibacterial structure is arranged at the end, exposed out of the shell, of the sealing rubber sleeve. According to the electric toothbrush handle disclosed by the embodiment of the utility model, the sealing rubber sleeve can be prevented from being polluted by bacteria, and the healthy and sanitary conditions of the handle are improved. The electric toothbrush disclosed by the embodiment of the invention comprises the electric toothbrush handle.

The invention discloses a steel structure rust removal device for a construction site. The steel structure rust removal device comprises a walking plate trailer, a stirring box, a water storage box, a material storage box, a high-pressure pump, a liquid conveying pipe and an air compressor. The stirring box is fixed on the top surface of the walking plate trailer; a liquid outlet is formed in the bottom of one side wall of the stirring box; a water outlet communicated with the inner cavity of the stirring box is formed in the bottom wall of the water storage box; grinding materials are contained in the storage box, and a discharging gate is hinged to the bottom end of the storage box so that the grinding materials can be put into the stirring box and stirred and mixed with water to form grinding liquid; the high-pressure pump is fixed on the outer wall of the stirring box; an inlet of the high-pressure pump communicates with the liquid outlet; one end of the liquid conveying pipe is detachably connected with an outlet of the high-pressure pump, and a high-pressure nozzle is fixed at the other end; the air compressor is fixed to the top face of the walking plate trailer to provide high-pressure air, and an air outlet of the air compressor communicates with the liquid conveying pipe through an air pipe. Water and grinding materials are stirred to form mixed grinding liquid, the mixed grinding liquid is sprayed to the surface of the steel structure through high pressure for rust removal operation, and secondary pollution to the environment is avoided.

The invention discloses a compound antioxidant and a preparation method thereof. The compound antioxidant comprises the following raw materials: 50-100g of copper sulfate; 150 to 200 ml of sodium sulfite; 15 to 20g of disodium ethylene diamine tetraacetate; 5-10 g of sodium dodecyl benzene sulfonate; and 500 to 1000 ml of deionized water. The composite antioxidant is prepared by the following process steps: fully dissolving 50-100g of copper sulfate in 1L of deionized water, and uniformly stirring. Slowly adding 150-200ml of sodium sulfite into the copper sulfate solution, controlling the reaction temperature within 30-50 DEG C, and continuously stirring for 1-2 hours until the reaction is complete. Adding 15-20g of disodium ethylene diamine tetraacetate into the solution, and stirring for 1 hour to improve the stability of the antioxidant. And then adding 5-10g of sodium dodecyl benzene sulfonate, and stirring for 1 hour. And finally, removing impurities in the solution in a suction filtration or filtration manner to obtain the composite antioxidant. The composite antioxidant is safe, environmentally friendly and high in applicability, oxidation reaction of copper can be effectively inhibited to a certain extent, and the shelf life of the product is prolonged.

An arrangement for the degradation stable storage and transport of a liquid comprising a non-substituted saturated aliphatic C6-12 carboxylic acid in which the liquid is surrounded by a metallic container and covered with an oxygen free or at least heavily oxygen depleted inert gas phase atmosphere above the liquid.

The utility model discloses a safety type multi-chamber peritoneal infusion bag, and relates to the field of medical devices. A safety type multi-chamber peritoneal infusion bag comprises a bag body used for infusion. The infusion cavities are formed in the bag body and used for containing liquid medicine; the isolating strip is formed by welding an upper layer and a lower layer of the bag body and used for separating the infusion cavities, and when the infusion cavities are extruded by external force, the upper layer and the lower layer of the isolating strip are separated so that the adjacent infusion cavities can be communicated; the safety chamber is arranged on the bag body and is separated from the infusion chamber through an isolating strip; the number of the liquid filling openings is the same as that of the infusion cavities, and each liquid filling opening is communicated with one infusion cavity; the easily-broken plug is connected with the liquid filling opening and is used for closing the liquid filling opening when infusion is not carried out to the infusion cavity; the liquid guide port is communicated with the safety chamber and is used for guiding out the liquid medicine; and the breaking plug is connected with the liquid guide port and is used for closing the liquid guide port when the liquid medicine is not output. According to the utility model, the problems of inconvenience and sterile risk of the dosing plug opening are solved.

The invention belongs to the field of daily chemicals, and discloses a supramolecular composition which comprises the following components in parts by weight: 35-40 parts of betaine; 25 to 35 parts of dihydric alcohol; and 30-40 parts of vitamin C. The composition adopts the betaine, the dihydric alcohol and the vitamin C to form a supramolecular structure, and the dihydric alcohol is mixed and melted with the betaine, so that the dihydric alcohol and the vitamin C can form the supramolecular structure by a conventional synthesis method, and VC discoloration is effectively inhibited. Meanwhile, the invention further provides a composition based on a supramolecular structure and capable of resisting VC discoloration, and in the application process, plant extracts are supplemented, so that better whitening and brightening effects can be achieved. In addition, the invention further discloses application of the composition and cosmetics.

The invention belongs to the technical field of electrolyte additives, and particularly relates to an estersil compound and a preparation method and application thereof. Wherein the general formula of the estersil compound is as shown in formula (I) to formula (IV), R1 is methyl, ethyl, isopropyl, vinyl or phenyl, and R2 is CH2 = CH <->, CH3 <->, CH3CH2 <->, (CH3) 2CH <->, (CH3) 3C <-> or H <->. The estersil compound provided by the invention can be used as an electrolyte additive, and can inhibit discoloration of an electrolyte in an electrochemical device, so that the storage time is prolonged, and the comprehensive performance of the electrochemical device is improved.

The utility model discloses a light-emitting diode packaging structure, and relates to the technical field of light-emitting diode packaging. In the light-emitting diode packaging structure, a bracket is provided with a mounting groove, and the bottom of the mounting groove is provided with a conductive layer; the light-emitting diode chip is arranged in the mounting groove and is electrically connected to the conductive layer; the anti-vulcanization layer is arranged in the mounting groove and covers the conductive layer; the fluorescent part is arranged in the mounting groove and covers the anti-vulcanization layer and the light-emitting diode chip, and the fluorescent part comprises a colloid matrix and fluorescent powder; wherein the fluorescent part at least comprises a first fluorescent layer, a centrifugal precipitation layer is formed at the bottom of the first fluorescent layer, and a light-transmitting layer is formed at the top of the first fluorescent layer; and the fluorescent powder concentration of the centrifugal precipitation layer is higher than that of the light-transmitting layer. The light emitting efficiency of the light emitting diode packaging structure can be improved.

The invention belongs to the technical field of sugar alcohol compositions, and particularly relates to a sugar alcohol composition containing lutein ester and a preparation method of the sugar alcohol composition. The sugar alcohol composition containing the lutein ester is prepared from the following components: 1.2 to 4.5 parts of gelatin, 30 to 36 parts of crystalline sugar alcohol, 38.6 to 44.2 parts of non-crystalline sugar alcohol, 2 to 6 parts of non-reducing sugar, 1 to 2 parts of glycerol, 1 to 2.3 parts of an emulsifier, 4 to 10 parts of grease, 0.2 to 0.6 part of lutein ester powder, 4 to 8 parts of sugar-free blueberry powder, 0.07 to 1.45 parts of an acidity regulator, 0.6 to 1.1 parts of blueberry essence powder, 2 to 4 parts of concentrated blueberry juice and 49.2 to 57.4 parts of water. The preparation method comprises the following steps: respectively preparing a gelatin solution, a mixture A, a mixture B, a mixture C and syrup for later use; and adding a gelatin solution into the syrup, stirring, sequentially adding the mixture A, the mixture B, the mixture C and the sugar-free blueberry powder, uniformly stirring, cooling, and finally preparing the sugar alcohol composition containing the lutein ester. According to the sugar alcohol composition, the sugar alcohol and other raw materials are reasonably selected and proportioned, and the problems that an existing sugar alcohol composition is not easy to form and prone to water loss, hardening and discoloring are solved.

The utility model provides an automatic tea picking machine which comprises a picking action mechanism, the picking action mechanism comprises a shell and a bionic mouth clamp arranged on the front side of the shell, the bionic mouth clamp is composed of an upper clamp body and a lower clamp body which are vertically symmetrical, the upper clamp body and the lower clamp body are rotationally connected with the front side of the shell respectively, and an upper blade and a lower blade are arranged on the front sides of the opposite sides of the upper clamp body and the lower clamp body respectively. When the bionic mouth clamp is closed, the upper blade and the lower blade perform cutting action; the picking driving mechanism is arranged in the shell and used for driving the bionic mouth clamp to be closed or opened; the collecting mechanism comprises a backpack, a suction mechanism is arranged in the backpack, the backpack is communicated with the interior of the shell through a pipeline, and when the bionic mouth clamp is closed, a cavity formed in the bionic mouth clamp is communicated with the interior of the shell. The tea leaf picking machine is light and easy to operate, the backpack and the suction mechanism can automatically collect tea leaves, physical labor is relieved, the duckbilled scissors complete the pruning and temporary storage process, the size of the duckbilled scissors is suitable for the tea leaves with the average size, and the accurate picking precision and quality are guaranteed.

The invention discloses a ureido-containing compound and a preparation method and application thereof.The structure of the ureido-containing compound contains a ureido structure, a double-bond structure and a nitrogen heterocyclic structure, and the preparation method of the ureido-containing compound is simple; the modulus and resolution of the photosensitive resin sheet can be improved by adding the photosensitive resin sheet into the photosensitive resin sheet, the adhesiveness of the photosensitive resin sheet with a base material after being cured at a low temperature of 200 DEG C can be improved, and the discoloration of a copper or copper alloy base material can be inhibited.

The application provides a 5-aminoacetylpropionic acid-producing strain and a construction method and application thereof. The strain takes Escherichia coli as a chassis, up-regulates the expression amount of a key gene hemA of a 5-aminoacetylpropionic acid synthesis pathway, can improve the carbon flux for synthesizing 5-ALA, and simultaneously inhibits the core gene of a porphyrin precursor synthesis pathway, such as by modifying the RBS and the initiation codon of the hemE gene at the genome level and / or knocking out the hemN gene on the genome, so as to reduce the accumulation of porphyrin intermediates, to realize high-yield 5-ALA, and to effectively avoid the discoloration and deepening of the fermentation broth of the above strain, and to reduce the burden of downstream separation and purification. Further, the 5-aminoacetylpropionic acid dehydrase hemB is weakened, so as to reduce the path of 5-ALA into the porphyrin synthesis pathway, and to improve the 5-ALA yield. Thus, the purpose of improving 5-ALA and avoiding discoloration of the fermentation broth is achieved, and the production cost of 5-ALA is effectively reduced.

This invention discloses a cooking appliance and its cooking control method, as well as a computer-readable storage medium. The cooking appliance includes a pot body and a heating element. The pot body forms a cooking cavity, and the heating element heats the cooking cavity. The cooking control method includes the following steps: based on the working stage of the cooking appliance, entering a deactivation stage; controlling the treatment of the cooking cavity, the treatment including at least one of heating, vacuuming, and oxygen removal; controlling the working stage of the cooking appliance to enter the cooking stage. The technical solution of this invention aims to enable the cooking appliance to undergo deactivation treatment before steaming or boiling, preventing the food to be cooked from discoloring and turning yellow after high-temperature cooking, thereby improving the cooking effect and reliability of the cooking appliance.

The utility model discloses a washable cotton fabric, which relates to the technical field of cotton fabric, and comprises a fabric roller, a fabric mechanism is arranged on the outer surface of the fabric roller, the fabric mechanism comprises a fabric body, the fabric body is sleeved outside the fabric roller, a pure cotton layer is arranged above the fabric body, a springback layer is arranged above the pure cotton layer, and the springback layer is arranged above the pure cotton layer. A springback layer is arranged above the fabric body, a washable layer is arranged above the springback layer, a reflecting layer is arranged above the washable layer, springback columns which are arranged at equal intervals are fixedly mounted on the inner wall of the fabric body, connecting grooves which are arranged at equal intervals are formed in the bottom surface of the reflecting layer, and the top end of each springback column is clamped in the corresponding connecting groove. Through the arrangement of the fabric body, the rebound layer and the washable layer, the phenomenon that the fabric deforms when being subjected to transverse tension in the cleaning process is avoided as much as possible, through the arrangement of the reflecting layer, the phenomena of color fading and discoloring of the fabric are avoided as much as possible, and then the service life of the fabric is prolonged.

This utility model discloses a conductive structure, a battery string, and a photovoltaic module, relating to the field of photovoltaic module manufacturing technology. The conductive structure specifically includes: a strip-shaped insulating tape, comprising an insulating layer and a tape substrate laminated to one side of the insulating layer; the insulating layer includes light-transmitting insulating regions and reflective insulating regions alternately arranged along the length of the insulating tape; and a conductive element corresponding to the insulating layer, the conductive element extending in the same direction as the insulating tape, with a first conductive region corresponding to the light-transmitting insulating region located on the side of the tape substrate away from the insulating layer, so that the first conductive region is electrically connected to the grid lines of the battery cells in the photovoltaic module. This conductive structure utilizes the light-transmitting insulating region to achieve effective contact between the first conductive region of the conductive element and the battery cells, and utilizes the reflective insulating region to reflect laser light spots outside the light-transmitting insulating region, effectively avoiding the problem of discoloration of the insulating adhesive.

This invention belongs to the field of coating technology and provides a wear-resistant coating for drone shells and its preparation method. The raw materials of the coating include: hydrogenated bisphenol A epoxy resin, vinyl-terminated fluorinated polybutadiene resin, core-shell powder, aluminum borate nanofibers, polyetherimide micro powder, wear-resistant additives, silane coupling agent KH-792, light stabilizer, leveling agent and environmentally friendly solvent. The preparation method includes: (1) mixing hydrogenated bisphenol A epoxy resin and vinyl-terminated fluorinated polybutadiene resin to form a resin matrix; (2) first adding core-shell powder and aluminum borate nanofibers to the resin matrix for dispersion; after cooling to 25-30℃, adding other raw materials, stirring and defoaming to obtain the finished product. This coating has high wear resistance, wind and sand erosion resistance, low temperature crack resistance, microcrack self-repair, strong UV aging resistance and high adhesion, which can significantly improve the long-term service stability and service life of drone shells in complex and harsh environments such as high altitude, wind and sand, high and low temperature alternation, and strong ultraviolet radiation.

The present application relates to a kind of herbicide composition and its preparation method and application.The active ingredient of the herbicide composition includes acetochlor, oxaziclomefone, 2,4-D isooctyl ester;Wherein, the mass ratio of acetochlor, oxaziclomefone, 2,4-D isooctyl ester is (1-60) :(1-25) :(1-35).The herbicide composition has good control effect on annual weeds in spring soybean field and spring corn field, and each active ingredient synergistic effect can significantly reduce the use dosage, and the dispersion effect is good, the weeding effect is excellent, has no influence on the following crops, is environment-friendly, high safety and stable system.

This invention provides a heat-resistant, migration-resistant, and moisture-adhesive starch-based material. By weight, the starch-based material comprises the following components: 60-85 parts natural starch, 3-8 parts composite crosslinking agent, 5-12 parts heat-resistant modified filler, 8-15 parts low-migration composite plasticizer, 2-6 parts moisture-adhesive functional regulator, 0.5-2 parts coupling agent, 0.3-1.5 parts antioxidant stabilizer, and 30-60 parts deionized water. This invention also provides a preparation method and application of the starch-based material. Through oxidative crosslinking composite modification, functional additive compounding, and three-dimensional network structure reconstruction technology, this invention constructs a dense and stable crosslinked network, effectively inhibiting the migration and precipitation of small molecule additives, significantly improving the material's high-temperature thermal stability and resistance to moisture-heat aging, while simultaneously endowing the material with durable and controllable moisture adhesion properties. The preparation process of this invention is simple, the raw materials are inexpensive and readily available, and the material is green and biodegradable. The resulting material can be widely used in food packaging, composite adhesives, medical bonding materials, daily-use moisture-adhesive products, and biodegradable coatings.

The invention relates to matte varnish for high-grade veneer automotive interiors and application of the matte varnish. The coating is prepared from the following raw materials: acrylic resin, polyester resin, polyisocyanate, a delustering agent, a directional auxiliary agent, an ultraviolet light absorber and the like. According to the invention, acrylic resin is used as matrix resin and does not contain benzene substances, so that the coating does not cause harm to the health of a user; the polyester resin is added to improve the toughness of the paint film and improve the matching performance with the base paint; polyisocyanate is added to cure the paint film; by adding the delustering agent, the gloss of the varnish film is adjusted to be matte, and the transparency of the varnish film is ensured; the ultraviolet absorbents with the absorbing and shielding functions aiming at different nanometer wave bands are added, most of 290-349 nanometer light waves are absorbed and shielded, and the problem that natural wood veneers and technical wood are prone to discoloring is solved; all the raw materials do not contain benzene substances, the paint and the coating have the characteristics of no toxicity and environmental protection, and the targeted ultraviolet shielding function protects a workpiece from discoloration and gloss loss.

The utility model discloses an absorbent paper drawing board, which comprises a plastic board, a water absorption layer, a scratch-resistant layer and a pattern outline, the plastic board, the water absorption layer and the scratch-resistant layer are compounded into an integral structure from bottom to top, and the pattern outline cuts off the water absorption layer and the water absorption layer from top to bottom. According to the technical scheme provided by the utility model, the drawing board is colored by absorbing the luminous liquid drawn by the fluorescent pen, the scratch-resistant layer is arranged, so that the drawing board is smoother when the fluorescent pen is used, and in the use process of the drawing board, in order to prevent the luminous liquid with different colors in the water absorption layer from changing color after being mixed, a pattern outline with a certain width is processed, and color disorder is prevented.

The invention discloses a solid wood bookshelf with the shelf height capable of being rapidly adjusted, and relates to the technical field of furniture design and manufacturing, the solid wood bookshelf comprises a bookshelf body, a spraying mechanism is arranged at the top of the bookshelf body, a pressurizing mechanism is arranged at the top of the bookshelf body, a drying mechanism is arranged on the side wall of the bookshelf body, and insect prevention liquid in a container is pressurized; the spraying force of the liquid can be increased, so that the insect prevention liquid can be better sprayed to a target site, the coverage area and uniformity of the sprayed liquid are improved, the insect prevention liquid is sprayed to the surface of the solid wood bookshelf, a layer of protective film can be formed on the wood surface, insect attack invasion is prevented, chemical components in the insect prevention liquid can effectively inhibit or kill insect attack, and the insect prevention effect is good. And drying is conducted after insect prevention liquid is sprayed, drying can help the insect prevention liquid permeate into the surfaces and textures of the wood better, and the insect prevention effect is improved.

The invention discloses a weather-resistant color master batch and a preparation method thereof, and mainly relates to the technical field of macromolecules. Compared with the prior art, the polypropylene color master batch has the advantages that the polypropylene resin is used as a main base material, the pigments, the dispersing agent, the lubricating agent and other auxiliaries are added, and the modified lignin-polyurethane emulsion is also added, so that the ultraviolet aging resistance and color stability of the polypropylene color master batch are improved. According to the invention, polyacrylamide, cellulose acetate and lignin are synthesized into modified lignin, so that damage and permeation of ultraviolet rays to the color master batch during application are reduced. And then the modified lignin is added into the preparation of the polyurethane emulsion, so that the elasticity, the flexibility and the adaptive capacity to temperature change of the color master batch are enhanced.

The invention belongs to the technical field of agricultural product processing, and particularly relates to an oriental cherry color fixing and drying method. The preparation method comprises the following steps: selecting, cleaning and draining fresh oriental cherry to obtain an oriental cherry raw material; the method comprises the following steps: soaking a sakura raw material in a color-protecting solution, performing ultrasonic treatment, and soaking in the color-protecting solution in combination with a pulse vacuum technology; and finally, stopping drying when the water content of the oriental cherry dry basis is reduced to 5% by utilizing a microwave vacuum drying technology, so as to obtain the dried oriental cherry product. According to the method, the self-developed special color protecting liquid for the dried oriental cherry products is adopted, the ultrasonic technology and the pulse vacuum impregnation technology are combined, and the dried oriental cherries which are pink and gorgeous in color are obtained through the microwave vacuum drying technology; the organic combination of the four factors avoids the color deterioration of the oriental cherry caused by a conventional drying method, provides a new method for industrial high-quality production of dried oriental cherry products, and has a wide application prospect.

The invention belongs to the technical field of cosmetics, and discloses a composition for inhibiting color change of a whitening agent as well as a preparation method and application of the composition. The composition disclosed by the invention comprises the following components: pentaerythritol tetra (bis-tert-butyl hydroxy hydrocinnamic acid) ester, sodium pyrosulfite and astaxanthin. According to the invention, pentaerythritol tetra (bis-tert-butylhydroxyhydrocinnamate) ester, sodium pyrosulfite and astaxanthin are reasonably compounded, the three components play a synergistic role, and discoloration of the whitening agent is inhibited by interrupting free radicals, inhibiting electron transition, absorbing ultraviolet rays, inhibiting free radical reaction and the like.

The utility model relates to the field of rhinestone production and processing, and provides a semi-open-close type rhinestone drying component which comprises a material frame capable of being opened and closed and further comprises a conveying device used for conveying the material frame. The drying device is provided with a drying box which is arranged above the conveying device and is used for drying the rhinestones; a first drying cavity, a second drying cavity and a third cooling cavity are formed in the drying box; the drying mechanism is arranged on the inner side walls of the first drying cavity and the second drying cavity, and the cooling mechanism is arranged on the inner side wall of the third cooling cavity and used for cooling the water drill. The turnover device is arranged in the middle of the first drying cavity and used for turning over the material frame so that the rhinestones in the material frame can be evenly heated. The equipment adopts the multiple drying cavities, moisture is rapidly dried through the high-temperature cavity, internal combined water is slowly discharged through the low-temperature cavity, and the drying efficiency is improved.

The invention relates to a novel crystal form of L-serine and a preparation method thereof. The novel crystalline form of L-serine has improved hygroscopicity and can be effectively used in the preparation of medicaments.