38results about How to "Light color" patented technology

The present invention provides the use of organic materials in the preparation of color-changeable polymer materials, and also provides color-changeable polymer materials prepared based on such organic materials and a preparation method thereof, belonging to the technical field of polymer laser processing. The present invention adds a specific organic material as an additive to a polymer to obtain a color-changeable polymer material, and the polymer material has an excellent color-change effect. Under the action of a laser, various color marks can be formed on the polymer material, and the obtained color marks are clear and flat with high contrast. At the same time, the polymer material is light in color, and color marks on light-colored, white or transparent polymer substrates can be realized, expanding the application range of laser color marks. In addition, the amount of organic material used in the color-changeable polymer material of the present invention is small, and the preparation method is simple, easy to operate, safe, and low in energy consumption, which is very suitable for large-scale industrial production.

The invention belongs to the technical field of food biology, and particularly relates to an antioxidant peptide derived from cantharellus cibarius sporocarp, an antioxidant peptide detection reagent and application, and the amino acid sequence of the antioxidant peptide is at least one of FPYPY, YPPYF, YYPF and MPWY. The antioxidant peptide provided by the invention is derived from chanterelle, is an enzymolysis product of chanterelle protein, and is derived from edible and medicinal fungus chanterelle, so that the antioxidant peptide is small in toxic and side effects and high in safety. Meanwhile, the antioxidant peptide disclosed by the invention has good biological activity and a relatively strong antioxidant effect, can remarkably scavenge free radicals, and can be applied to repair damage caused by oxidative stress.

The invention belongs to the technical field of organic compounds, and discloses a preparation method of butynediol diethoxy ether and butynediol polyethoxy ether. The preparation method of the butynediol polyethyoxyl ether comprises the following steps: mixing 1, 4-butynediol and a basic catalyst, then adding first ethylene oxide to carry out a first polymerization reaction, and after the reaction is finished, carrying out post-treatment to prepare butynediol diethyoxyl ether; and mixing the butynediol diethoxy ether with second ethylene oxide and a phosphazene salt catalyst, and carrying out a second polymerization reaction to prepare the butynediol polyethoxy ether. The butynediol diethoxy ether prepared by the method is light in color and narrow in molecular weight distribution. The polyethyoxyl butynediol with light color, narrow molecular weight distribution, low peroxide value and small 1, 4-butynediol residual quantity can be prepared by using the polyethyoxyl butynediol as a catalyst of a second polymerization reaction and using phosphazene salt as a catalyst of the second polymerization reaction by using the polyethyoxyl butynediol polyethyoxyl butynediol polyethyoxyl butynediol polyethyoxyl butynediol polyethyoxyl butynediol polyethyoxyl butynediol polyethyoxyl butynediol.

The invention provides an impurity removal device for a clear-pond tea saponin concentrated solution, which comprises a device support column and a device shell fixedly mounted at the top of the device support column, a liquid inlet column is arranged in the device shell, a liquid inlet is formed in the upper end of the liquid inlet column, a liquid storage box is fixedly mounted on the inner side of the device support column, and a liquid outlet is formed in the lower end of the liquid storage box. A liquid filtering device is fixedly installed at the center of the top of the liquid storage box, the bottom of the liquid inlet column is located at the center of the liquid filtering device, a filter screen disc is arranged in the liquid filtering device, and a transverse liquid distributing pipe and a longitudinal liquid distributing pipe are arranged at the top of the filter screen disc. Through the synergistic effect of the designed liquid inlet column, the filtrate device, the filter screen disc and the filter agent caulking groove, uniform permeation of the tea saponin concentrated solution in the filter agent is realized, and biological polysaccharide is effectively adsorbed and filtered by the composite filter agent, so that the proportion of pentacyclic triterpenoid saponin in the concentrated solution is remarkably increased. The desugared concentrated solution is light in color, so that higher efficiency is shown when wild trash fishes are removed in shrimp and crab culture.

The invention belongs to the field of preparation of dental restoration materials, and particularly relates to a betulinol-based dendritic organic monomer, composite resin and a preparation method. The invention provides the betulin-based dendritic organic monomer which is mild in reaction condition, light in product color and good in mixing effect with a resin matrix. The invention further provides composite resin which is prepared from the organic monomer and shows remarkable biocompatibility and low polymerization shrinkage. The invention also provides a preparation method of the composite resin.

The present invention relates to a separation device for a dichloromethane and white oil mixed liquid, comprising a distillation system, a white oil treatment system, and a dichloromethane treatment system, wherein the distillation system comprises a distillation tower, an evaporator, and a gas-liquid separator; the white oil treatment system comprises an oil rectifying device, a white oil cooler, and a white oil collector; and the dichloromethane treatment system comprises a dichloromethane condenser, a water separator, and a dichloromethane collector. The present invention adopts a falling film evaporator, the material residence time is short, the steam working pressure is small, and the steam consumption is low. At the same time, the temperature of the evaporated white oil concentrate is low, the color is light, and the purity is high. After the evaporated dichloromethane gas is subjected to gas-liquid separation, condensation, and water separation, the white oil content in the dichloromethane is within 20ppm. After the white oil is rectified and cooled, the dichloromethane content in the finished white oil is within 80ppm. In addition, the structure is simple and the implementation is convenient.

The invention discloses a method for improving the yield of hydration reaction of myrcene or dihydromyrcene and a synthetic fragrance, belonging to the technical field of deep processing of forest chemical products. The method comprises steps of synthesis reaction, catalyst recovery, solvent recovery, product neutralization, product fractionation, etc. The invention adopts a composite catalyst composed of one or more of zirconium sulfate, titanium sulfate, α-hydroxy acid and divalent copper salt to catalyze the hydration reaction of myrcene or dihydromyrcene, thereby improving the yield of hydration products and reducing side reactions and energy consumption.

This invention discloses a low-temperature desolventizing machine and its usage method, relating to the field of grain and oil deep processing technology. The low-temperature desolventizing machine includes a machine body and a steam-water integrated utilization device. The machine body includes a cylinder and a rotating mechanism. The cylinder includes a front end cover and a rear end cover located at its front and rear ends. The cylinder also includes an inner cylinder, which is equipped with a feed inlet, a front settling tank, a solvent gas inlet, a rear settling tank, and a discharge outlet. An outer jacket is provided outside the inner cylinder, comprising an annular jacket and multiple flow-guiding jackets. The steam-water integrated utilization device is connected to the flow-guiding jackets and the annular jacket via pipelines and can provide hot water circulation and flash steam heating to the inner cylinder. This invention uses hot water and flash steam instead of steam heating, changing the traditional A-cylinder / B-cylinder desolventizing method, and solving the problems of high residual solvent content, low nitrogen solubility index, dark color, high powder content, and large moisture loss in low-temperature meal, greatly reducing solvent and steam consumption.

This invention relates to the field of organic compound preparation technology, specifically a method for preparing 11-triglycerides of carbonate via low-temperature acylation. This method uses glycerol and undecanoyl chloride as raw materials, employing a synergistic system of a "composite acid-binding agent + Lewis acid catalyst," and combines in-situ dehydration technology and a stepwise heating strategy in a dual-solvent environment to achieve efficient synthesis. The specific steps include: under nitrogen protection, dissolving glycerol in a dichloromethane-toluene dual solvent, adding a composite acid-binding agent of pyridine and N,N-diisopropylethylamine, anhydrous zinc chloride catalyst, and 4A molecular sieve for in-situ dehydration; dropwise adding undecanoyl chloride at a low temperature of 5-10°C, followed by sequential heating to 30°C for 2-3 hours and then reacting at 50°C for 12-16 hours; and post-processing using a combined process of filtration-multi-stage extraction-membrane separation-column chromatography. This invention provides mild reaction conditions, effectively suppresses side reactions, produces high-purity products, increases molar yield, and reduces solvent toxicity and purification costs.

The invention relates to the technical field of polyester resin, and discloses a preparation process of tin-free environment-friendly polyester resin, which is characterized in that dihydric alcohol, dibasic acid, a catalyst, an antioxidant, an acidolysis agent, a curing accelerator and the like are reacted to obtain the tin-free environment-friendly polyester resin. According to the invention, bismuth iso-octoate and 4-dimethylaminopyridine form a compound catalyst to replace a traditional organic tin catalyst, so that the tin-free environment-friendly polyester resin is obtained, and the blank of the tin-free environment-friendly polyester resin is filled. The toxic and side effects are effectively reduced, the environmental pollution is reduced, and the requirements of environment-friendly polyester resin are met. Meanwhile, tris (2-hydroxyethyl) benzene-1, 3, 5-triformate is added to participate in esterification polycondensation reaction, contains a plurality of hydroxyl crosslinking polymerization sites and a heat-resistant benzene ring structure, and is crosslinked into polyester resin molecules, so that the glass-transition temperature, the heat stability and the biodegradability of the resin can be improved.

The invention discloses a method for preparing a low-sodium-sulfate-content, low-chroma and high-performance naphthalene sulfonic acid formaldehyde condensate, which comprises the following steps: carrying out sulfonation reaction on naphthalene and concentrated sulfuric acid at 155-165 DEG C, adding benzene, methylbenzene, xylene or a mixture of two or three of benzene, methylbenzene and xylene into a reactor, forming azeotrope steam from water generated by the reaction and benzene or methylbenzene, and reacting to obtain the low-sodium-sulfate-content, low-chroma and high-performance naphthalene sulfonic acid formaldehyde condensate. Steam is condensed and then flows into an oil-water separator to be layered, water is discharged through a piston at the bottom end of the oil-water separator, the sulfonation degree is evaluated according to the quality of the discharged water, when the discharged water amount reaches 5 / 32 of the mass of naphthalene, it is proved that sulfonation reaction is completed, excessive solvent is evaporated out, the temperature is reduced to 110-120 DEG C, water with the mass ratio of naphthalene to water being (0-9): 128 is added for hydrolysis, the temperature is reduced to 100-120 DEG C, and the sulfonation degree is evaluated according to the quality of the discharged water. The mass ratio of the formaldehyde to the naphthalene is 83: 128-87.5: 128, the mass ratio of the formaldehyde to the naphthalene is 83: 128-87.5: 128, the polymerization reaction is carried out for 4-8 hours, the mass ratio of the water to the naphthalene is 9: 32-45: 64, the viscosity of the system is reduced, after full reaction, a sodium hydroxide solution is used for neutralization, and the product is obtained.

The invention provides an idebenone derivative and a preparation method and application thereof, the idebenone derivative has an uronic acid structure, the water solubility of idebenone can be improved, the first-pass effect of idebenone is reduced, and more and more effective medicine schemes are provided for treating mitochondrial dysfunction and neurodegenerative diseases. Meanwhile, the idebenone derivative has better stability in air and lighter color, the use and storage conditions of idebenone can be reduced, and the application scene of idebenone in the fields of cosmetics and the like is greatly widened; moreover, the preparation method of the idebenone derivative is simple, conditions are mild, and the idebenone derivative has a good application prospect.

The invention discloses a method for airing yellowish-brown eggplant coats, and belongs to the technical field of tobacco processing. The air-curing method comprises the following steps: S1, placing mature tobacco leaf weaving rods in different air-curing areas in a standard air-curing room, arranging red light and blue light sources at the bottoms of mature tobacco leaves in the different air-curing areas, and then air-curing the mature tobacco leaves; s2, starting from the 3th-5th day after airing, turning on a red light source and a blue light source every day to supplement light, and stopping light supplement until the 20th-30th day after airing; continuously airing, and obtaining a yellowish-brown eggplant coat after the airing is finished; wherein in the step S2, the light intensity of the red light source is 2.5-7.5 mw / m < 2 > / nm, and the light intensity of the blue light source is 20-60 mw / m < 2 > / nm. The combined light sources with different intensities and light qualities are used for supplementing light in the airing process of the eggplant coating, so that the color of the eggplant coating is obviously lightened and is in typical yellowish brown, and the quality of the eggplant coating is obviously improved.

The invention provides antibacterial and insect-proof silk paper for calligraphy and painting and a preparation method of the antibacterial and insect-proof silk paper, and relates to the technical field of papermaking. Comprising the following steps: S1, putting flat silk into warm water, adding lauryl sodium sulfate, urea and Ca (ClO) 2, preserving heat, standing and stirring; then adding NaOH, standing and rubbing, then fishing out the flat silk, soaking and cleaning with water, spreading and drying; s2, soaking the dried flat silk in an antibacterial insect-resistant solution, fishing out and airing, repeatedly soaking and airing for 2-3 times, paving, and drying; s3, soaking the flat silk dried in the step S2 in a whitening and softening solution, and then fishing out, flatly laying and drying; and then spraying antibacterial nanocapsules on one or two surfaces of the silk paper, and drying to obtain the silk paper. The silk paper prepared by the method is high in white cleanliness and beneficial to storage, and has antibacterial and corrosion-resistant properties.

The invention discloses a catalyst and a preparation method thereof, and a system and a method for continuously preparing methylhexahydrophthalic anhydride, and belongs to the technical field of methylhexahydrophthalic anhydride preparation. The catalyst has a double-layer structure, the outer layer is a stainless steel hollow structure, and the inner layer is a Raney nickel-cobalt metal structure. The catalyst not only has high activity and high hydrogenation efficiency of a Raney nickel catalyst, but also has the advantages of high strength, long service life, strong stability and the like, and can be used for preparing methylhexahydrophthalic anhydride. Besides, according to the system for continuously preparing methylhexahydrophthalic anhydride provided by the invention, the hydrogenation process is divided into two sections, and the catalyst is used for the second-section hydrogenation process, so that higher hydrogenation efficiency, shorter hydrogenation residence time and higher production efficiency can be obtained in this way, the saturation degree of a hydrogenation product is high, and the yield of the product is increased. The method has the advantages of low iodine value, light color number, high purity, higher yield, few byproducts and the like.

The application discloses a preparation method of concave-convex texture ceramic tiles with uniform color and luster, and comprises the following steps: A, blank is pressed into a blank body by roller forming, and the blank body layer is obtained after first drying; B, printing ink of a mold is printed according to a preset pattern, digital face glaze is sprayed, and the concave-convex texture layer is formed after second drying; C, color ink is printed according to the preset pattern, and the inkjet printing layer is formed; D, digital protection glaze is sprayed, and the protection glaze layer is formed after third drying and fourth drying; E, kiln firing is performed, and the concave-convex texture ceramic tiles with uniform color and luster are obtained after polishing. The preparation method of the concave-convex texture ceramic tiles with uniform color and luster is simple in steps and high in operability, and under the premise of solving the black edge problem and ensuring the uniform color and luster of the ceramic tiles, the concave-convex texture effect with clear texture, high consistency and high fidelity is obtained on the surface of the ceramic tiles.

The invention belongs to the technical field of epoxy resin production, and particularly relates to a preparation method and application of low-chlorine epoxy resin. The method comprises the following steps: carrying out n times of dechlorination on an epoxy resin organic phase solution, and standing and layering the obtained final dechlorination solution to obtain a final dechlorination organic phase solution; and adjusting the pH value of the final dechlorination organic phase solution to 6-7, and removing the solvent from the obtained neutralized dechlorination organic phase solution to obtain the low-chlorine epoxy resin. According to the method, potassium hydroxide is adopted as an active component of the dechlorination reagent, meanwhile, the dosage of potassium hydroxide is controlled, the dechlorination temperature is larger than or equal to 80 DEG C, potassium hydroxide is used for rapid reaction dechlorination under the action of the phase transfer catalyst, and chloride ions in epoxy resin can be effectively removed. According to the method, the total chlorine content in the low-chlorine epoxy resin product can be effectively controlled through multiple times of chlorine removal operation, controllable adjustment of product indexes is achieved, it is guaranteed that the finally obtained product is good in batch stability, light in color and luster and low in total chlorine content, and the application requirement of photoresist can be met.

The application discloses a kind of high light-transmitting high-efficiency shielding ultraviolet biodegradable film and its preparation method and application.The high light-transmitting high-efficiency shielding ultraviolet biodegradable film provided by the application includes: biobased degradable film and lignin-tannin composite nanoparticles located in biobased degradable film.The high light-transmitting high-efficiency shielding ultraviolet biodegradable film provided by the application makes full use of the structural characteristics of lignin and tannin, and the composite particles generated by self-assembly of lignin and tannin, the π-π stacking of benzene ring in lignin structure and the rich phenolic hydroxyl in tannin structure can significantly enhance the ultraviolet shielding performance.In addition, tannin is lighter than lignin, which can significantly reduce the color of the film.Therefore, a biodegradable film with high transparency and high-efficiency ultraviolet shielding effect can be prepared at low addition amount.

The invention relates to an integrated preparation process of low-residue trioctyl trimellitate, which comprises the following steps: carrying out ring-opening reaction on trimellitic anhydride and 2-ethyl hexanol under the protection of inert gas; then adding a main catalyst to carry out first-stage esterification reaction; then adding a cocatalyst to carry out a second-stage esterification reaction, after the esterification reaction is finished, carrying out first treatment on the reaction liquid by using a 2-5% dilute sodium carbonate or sodium hydroxide solution, then adjusting the pH value of the reaction liquid subjected to the first treatment to 2-3 by using dilute sulfuric acid or hydrochloric acid, and carrying out countercurrent washing by using hot water; adding excessive organic acid into the reaction liquid for reaction to obtain esterification reaction liquid after the catalyst is recycled; and finally, sequentially adsorbing, filtering and refining to obtain the low-residue trioctyl trimellitate. According to the method, a multi-element catalyst system and a step-by-step esterification process are adopted, and esterification reaction liquid after reaction is treated in a three-step treatment mode, so that efficient recovery of a catalyst is realized, and residues of the catalyst in trioctyl trimellitate are effectively reduced.

The present application relates to a kind of compositions with soothing repair anti-wrinkle efficacy, consisting of the following components: 1-10 parts of ginsenoside, 90-99 parts of notoginseng stem and leaf extract;Wherein, the notoginseng stem and leaf extract includes the following weight ratio of components: 2-8:1 water-soluble organic solvent and notoginseng stem and leaf extract.The ginsenoside in the composition of the present application is compounded with notoginseng stem and leaf extract, has synergistic effect, and jointly plays the role of soothing repair anti-wrinkle.

The invention provides a selective metallization resin composition capable of being activated by laser. The selective metallization resin composition consists of the following components in percentage by weight: 1-45% of tin salt and 55-99% of polymer. The invention also provides a preparation method and application of the resin composition. The tin salt shows excellent laser activation capacity under the action of laser with the wavelength range of 190-1064nm, the prepared resin capable of being selectively metallized through laser activation is light in color and good in chemical plating effect after activation, and under the condition that the addition amount is as low as 1wt%, the thickness of a plating layer of an obtained resin composition reaches 2 microns or above, and the thickness of the plating layer is more than 2 microns. And according to the test of a cross-cut knife (ASTM D3359), the strength of the coating reaches the highest 5B level, and the application prospect is very wide.

The present application belongs to the technical field of traditional Chinese medicine extraction, and particularly relates to an extraction method of high-activity ginseng extract, which is used for improving the conversion and extraction efficiency of rare ginsenosides Rg1, Rg3, Rg5, Rh2 and Compound K. The extraction method combines microbial fermentation, electrostatic field wall breaking and supercritical CO2 extraction. The microbial fermentation treatment is mainly used for promoting the synthesis of ginsenosides, the high-voltage pulse electric field induces the electroporation effect of ginseng cells to increase the permeability of cell membrane and cell wall, the supercritical CO2 extraction has high cell permeability to improve the extraction rate and purity of ginsenosides, and in addition, the catalytic aid added in the extraction process is helpful to the conversion and catalysis of rare ginsenoside components.

The invention discloses a modified polymer, low-amine-value activated polyurethane, a resin intermediate, a low-amine-value resin intermediate and a preparation method of the low-amine-value resin intermediate, and provides the modified polymer serving as the activated polyurethane, the activated polyurethane is prepared by crushing polyurethane solid waste, the particle size of the activated polyurethane is not less than 40 meshes, and the particle size of the activated polyurethane is not less than 10 meshes. The form of the activated polyurethane product comprises but is not limited to one or more of paste, particle, block, strip, sheet, ball, powder or flocculent. The crushing treatment comprises but is not limited to one or combination of more of crushing, shearing, milling, ball milling, grinding, airflow crushing, ultrasonic crushing and the like; the initial polymer is polyurethane waste; wherein equipment for crushing treatment comprises one or a combination of two of an internal mixer and a screw extruder. The method has the advantages that the environmental pollution is reduced, and the safety of a production place is improved.

The application discloses a preparation method of a dihydroxyethyl bisphenol A ether and belongs to the technical field of organic synthesis. The steps of the preparation method are as follows: bisphenol A, a mixed acetate catalyst and a solvent are added into a reaction kettle, nitrogen is replaced after stirring is started, the temperature is increased to a reaction temperature, then the reaction is started by introducing ethylene oxide, the temperature is kept after the ethylene oxide is added completely, the reaction is continued until the pressure does not decrease, the temperature is decreased to a desolventizing temperature, then desolventizing is carried out until no solvent comes out, and then the temperature is decreased, the gas is removed, and the product is discharged, so that the dihydroxyethyl bisphenol A ether is obtained; wherein the mixed acetate catalyst is composed of calcium acetate, magnesium acetate and barium acetate; and the solvent is methylcyclohexane. The preparation method has excellent catalytic effect, the prepared dihydroxyethyl bisphenol A ether has high content, low hydroxyl value and light color, and the solvent has small toxicity and is easy to recycle.

The application discloses a conductive monofilament and a preparation method thereof. The conductive monofilament comprises an inner layer and an outer layer, the outer layer wraps the inner layer, the inner layer is a nylon monofilament, and the outer layer is a conductive coating. The conductive coating comprises the following components by weight: 50-55 parts of DMSO; 16-20 parts of polyurethane resin; 18-20 parts of conductive mica powder; 7-9 parts of conductive graphene; and 3-4 parts of superfine silicon dioxide powder. According to the technical scheme provided by the embodiment of the application, the inner and outer layer structure formed by wrapping the inner layer monofilament with the conductive coating slurry has the effect of conducting electricity, and the conductive coating is arranged by using materials such as conductive mica powder and conductive graphene, so that the formed conductive coating is light in color, the formed conductive monofilament is also light in color, the prepared conductive monofilament has high strength and good conductivity, and the light-colored conductive monofilament can have more application scenarios.

The application discloses a cellulose solution containing a stabilizer and a preparation method and application thereof, and the preparation method comprises the following steps: stirring and mixing an ionic liquid and a stabilizer at room temperature until a uniform mixture is obtained; adding a cellulose raw material into the obtained mixture, fully stirring and pre-mixing at room temperature to form a pre-dissolved cellulose mixture; and heating and stirring the obtained cellulose mixture until the cellulose raw material is completely dissolved to form a uniform and transparent cellulose solution, that is, the cellulose solution containing the stabilizer is obtained. By adding the stabilizer, the application reduces the color deepening of the ionic liquid in the process of dissolving the cellulose under high temperature or water-containing conditions.

The present invention belongs to the field of biomedicine technology, relates to the production of pharmaceutical excipients, and specifically relates to a method for preparing high-sulfonated sodium polystyrene sulfonate. Polystyrene powder is dispersed in chloroform and heated to swell, then a sulfonating agent is added to carry out a sulfonation reaction, and then a dehydrating agent is added to continue the sulfonation reaction. After the sulfonation reaction is completed, washing is carried out, and sodium alkali is added to convert the sulfonic acid group into a sodium sulfonate group, and the sulfonating agent is concentrated sulfuric acid or fuming sulfuric acid, the temperature of the sulfonation reaction is 50°C to the boiling point of chloroform, and the dehydrating agent is one or more of acetic anhydride, chloroacetic anhydride, and cyanuric chloride. The preparation method of the present invention can abandon sulfonating agents such as sulfur trioxide and chlorosulfonic acid that are highly polluting and difficult to purchase, reduce the reaction temperature, and the obtained product has qualified color, no special treatment is required, and the degree of sulfonation is high.

The invention belongs to the technical field of electronic welding materials, and particularly relates to high-reliability rosin-free no-clean soldering paste, flux paste used for the soldering paste and a preparation method of the flux paste. The soldering paste prepared from the flux paste is good in wettability, few in residue after welding, light in color and free of cleaning; the printing performance, the demolding performance, the void resistance and the corrosion resistance are excellent, the welding spot quality can be greatly improved, and the stability of various electronic components is guaranteed.

The invention relates to an improved synthesis and separation method of dimethyl thio toluenediamine, which comprises the following steps: by taking toluenediamine and dimethyl disulfide as raw materials, cuprous iodide as a catalyst and a phosphorus-containing additive as a protective auxiliary agent, reacting at 130-150 DEG C under normal pressure to synthesize the dimethyl thio toluenediamine, and carrying out extraction separation, alkali neutralization and saturated saline solution washing on the crude product by using dilute phosphoric acid containing phosphorous acid and a hydrochloric acid aqueous solution containing phosphorous acid to finally obtain the dimethyl thio toluenediamine with light color. When the method is used for preparing the dimethyl thio toluenediamine, the color of the diamine can be improved, and the purity of the diamine can be improved.

The invention provides an application of an StMYB113b gene in regulating and controlling the epidermal color of a potato tuber. According to the invention, the key gene StMYB113b for regulating and controlling the formation of the red skin pigment of the potato tuber is found and cloned for the first time, and the gene can influence the skin color of the potato tuber by regulating and controlling the synthesis of an anthocyanin-related compound. Through overexpression or knockout of the gene, regulation and control of the potato tuber epidermis color can be achieved, a new way and gene resources are provided for potato variety improvement, and the gene has important theoretical value and application prospects.