30 results about "Thiodipropionic acid" patented technology

The invention discloses a composition for improving the stability of oleuropein in a solution as well as a preparation method and application of the composition. The composition comprises oleuropein and at least one stabilizer, and the stabilizer is selected from the group consisting of anisic acid, lactobionic acid, glycyrrhizic acid, 3, 3-thiodipropionic acid, N-acetyl-L-glutamine, propyl-cysteine and lauramidopropyl betaine; and the pH value of the aqueous solution of the composition is 4.0-8.0. The preparation method comprises the following steps: dissolving oleuropein in water, adding the stabilizer, and uniformly mixing. Through simple physical mixing, by utilizing the synergistic effect of the specific stabilizer and the oleuropein, the degradation and discoloration of the oleuropein in the storage process are remarkably inhibited. Experiments show that after the preferable composition is preserved for 30 days in an open manner, the retention rate of the oleuropein still reaches up to 80% or above, and is far superior to that of blank control and a traditional liposome wrapping method. The composition is simple and convenient in preparation process and low in cost, and provides reliable technical support for wide application of oleuropein in liquid products such as food, medicine and cosmetics.

The invention relates to the field of functional materials, and discloses a high-absorptivity sanitary napkin core material which is prepared from the following components in parts by mass: 30-35 parts of spiral nano cellulose; 20 to 25 parts by mass of a polyglutamic acid-polylysine grafted copolymer; 0.5 to 1.5 parts by mass of a thiodipropionic acid cross-linking agent; the helical angle of the helical nanocellulose is 25-35 degrees, the diameter of the helical nanocellulose is 5-10 nm, the specific surface area of the helical nanocellulose is greater than or equal to 300 m < 2 > / g, in the polyglutamic acid-polylysine grafted copolymer, the grafting rate of polylysine is 15-25%, the molecular weight of the polylysine is 3-5 kDa, the particle size of the nano-zinc oxide is 20-30 nm, the surface of the nano-zinc oxide is subjected to hydroxylation modification, and the surface of the nano-zinc oxide is 20-30 nm. The nano zinc oxide and the spiral nano cellulose are combined through a hydrogen bond and Van der Waals force, and the combination energy is greater than or equal to 25kJ / mol. By adopting the spiral angle and gradient pore design of the spiral nanocellulose, the technical effect of synergistic enhancement of liquid directional diversion and bottom layer latching is achieved.

The invention relates to an additive composition comprising primary anti-oxidants and a secondary anti-oxidant, wherein the primary anti-oxidants are a phenyl phosphite and 3,3′-thiodipropionic acid dioctadecylester, and wherein the secondary anti-oxidant is epoxidized soybean oil. The invention additionally relates a bituminous composition comprising primary anti-oxidants and a secondary anti-oxidant, wherein the primary anti-oxidants are a phenyl phosphite and 3,3′-thiodipropionic acid dioctadecylester; and wherein the secondary anti-oxidant is epoxidized soybean oil. The invention also relates to an asphalt composition comprising the bituminous composition with resistance to short-term and long-term chemical ageing. The invention further relates to the use of an additive composition to reduce short-term and long-term chemical ageing of a bituminous composition.

The application discloses a kind of thiodipropionic acid with flash dryer in antioxidant preparation technical field, it is related to thiodipropionic acid drying device field, including: stirring crushing mechanism;Pretreatment mechanism, the pretreatment mechanism includes pretreatment cylinder and discharge pipeline, the discharge pipeline is arranged at the bottom of the pretreatment cylinder for after being pretreated by pretreatment cylinder Material is transported to the inner cavity of stirring crushing mechanism connected thereto and is pulverized and dried to handle, the stirring crushing mechanism includes: drying chamber, first feeding port is arranged on the circumferential outer side wall of the drying chamber;Bellows, the bellows are arranged on the circumferential outer side wall of the drying chamber, the bellows are arranged at the lower end of the first feeding port, this kind of thiodipropionic acid with flash dryer, pretreatment is carried out to material by pretreatment cylinder, pretreated material is transported to the inner cavity of stirring crushing mechanism by discharge pipeline and is pulverized and dried to handle, improve work efficiency.

The invention relates to an adhesive composition comprising: a) At least one polymer P, b) A stabilizer S comprising b1) At least one first stabilizer S1 and b2) At least one second stabilizer S2, which is different from the at least one stabilizer S1 wherein the first stabilizer S1 is a non-sulfur containing compound having at least two phenolic groups selected from ethylenebis(oxyethylene) bis[3-(5-tert-butyl-4-hydroxy-m- tolyl)propionate] and pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4- hydroxyphenyl)propionate)the second stabilizer S2 is a sulfur containing compound selected from thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxy-phenyl)propionate] and dilauryl 3,3'-thiodipropionate; wherein the at least one polymer P is selected from at 25 °C solid non-functionalized and functionalized polyolefins;

The invention relates to the technical field of cables, and provides a high-strength aluminum alloy power cable. The cable is sequentially provided with an aluminum alloy conductor layer and an outer sheath layer from inside to outside. The outer sheath layer is prepared from the following raw materials in parts by weight: 40 to 50 parts of low-density polyethylene, 20 to 30 parts of ethylene propylene diene monomer, 8 to 15 parts of maleic anhydride grafted ethylene-vinyl acetate copolymer, 20 to 25 parts of modified attapulgite, 10 to 15 parts of nano hydrotalcite, 6 to 8 parts of coated potassium titanate whisker, 1.5 to 2 parts of dicumyl peroxide, 10 to 15 parts of magnesium hydroxide, 3 to 5 parts of zinc borate and 0.3 to 0.5 part of antioxidant 1010. 0.2-0.4 part of dilauryl thiodipropionate, 4-5 parts of a calcium-zinc composite stabilizer and 0.5-1 part of calcium stearate. According to the invention, the flexibility of the cable outer sheath is improved while high strength is ensured, and the heat dissipation performance of the high-strength outer sheath is improved at the same time.

The invention discloses a crude oil drag reducer and a preparation method thereof, and relates to the technical field of drag reducers. The composition comprises the following components in parts by weight: 5-10% of a main anti-drag component; 2%-4% of a dispersing aid; 1%-3% of an adaptive auxiliary agent; 0.8%-1.5% of a resistant auxiliary agent; 0.3%-0.7% of an antioxidant stabilizer; 0.1%-0.2% of an auxiliary antioxidant; the rest component is a base oil carrier; the main drag reduction component is modified poly-alpha-olefin; the dispersing aid is formed by compounding Span-80 and polyethylene wax; the adaptive auxiliary agent is hydroxylated graphene; the resistant additive is a sulfonated styrene-maleic anhydride copolymer; the antioxidant stabilizer is formed by compounding 2, 6-di-tert-butyl-4-methylphenol and phosphite ester, and the antioxidant stabilizer is an antioxidant stabilizer; the auxiliary antioxidant is dilauryl thiodipropionate; the base oil carrier is hydrocracking base oil; the technical scheme provided by the invention can have good anti-shearing performance and storage performance.

The application provides a preparation method of polyol carboxylic acid ester, comprising: performing esterification reaction on polyol and a carboxylic acid composition under the action of a catalyst and a water-carrying agent to obtain polyol carboxylic acid ester; the carboxylic acid composition is selected from 3-mercaptopropionic acid and 3,3'-thiodipropionic acid, and the content of the 3,3'-thiodipropionic acid in the carboxylic acid composition is 0.01-1 wt%. The application also provides a polymer composition and an adhesive. The adhesive provided by the application improves the bonding performance of the adhesive by using the carboxylic acid composition instead of 3-mercaptopropionic acid as the reaction raw material of the polyol carboxylic acid ester.

The invention relates to the technical field of heat treatment quenching media, in particular to quenching oil special for 05Cr15Ni5Cu4Nb precipitation hardening stainless steel and a preparation method and application of the quenching oil. The special quenching oil for the 05Cr15Ni5Cu4Nb precipitation hardening stainless steel is prepared from the following components in percentage by mass: 88 to 95 percent of base oil combination, 1.5 to 5.0 percent of quick cooling agent, 2.0 to 3.5 percent of antioxidant and 1.0 to 4.0 percent of dispersing agent, the base oil composition is a mixture composed of refined hydrogenated mineral oil 150N and refined hydrogenated mineral oil 500N; the quick cooling agent is polyisobutene; the antioxidant is a combination of phenyl-alpha-naphthylamine and dialkyl dithiophosphate carbamate, or a combination of phenyl-alpha-naphthylamine and dilauryl thiodipropionate, and the antioxidant is a combination of phenyl-alpha-naphthylamine and dilauryl thiodipropionate. Through base oil compounding and rapid cooling agent dosage optimization, the step quenching effect of high-temperature rapid cooling and low-temperature slow cooling is achieved, martensite transformation of a 05Cr15Ni5Cu4Nb precipitation hardening stainless steel workpiece is stably completed near the Ms point, and a uniform and fine lath martensite structure is provided for subsequent aging strengthening.

The application discloses a kind of based on 3,3'-thiodipropionic acid pre-positioning regulation perovskite film preparation method, perovskite film and perovskite solar cell.For the problem that one-step method formamidine lead triiodide perovskite film exists in the process of anti-solvent induced crystallization kinetics uncontrollable, grain is small, and many defects, the preparation method disclosed in the application introduces trace 3,3'-thiodipropionic acid as additive in precursor solution.The additive is pre-coordinated with lead ions in the solution stage, and uniform wet film is quickly formed during spin coating, and controlled release and slow crystallization of lead species are realized during subsequent annealing process, so as to synergistically optimize film formation and crystallization kinetics.This method can significantly promote perovskite grain growth, reduce grain boundary density, and passivate film defects.Finally, the solar cell device based on the film shows higher photoelectric conversion efficiency and more excellent long-term working stability.

The invention discloses a degradable composite non-woven fabric and a preparation method of the degradable composite non-woven fabric, and relates to the technical field of non-woven fabrics. The composite material is prepared from the following components in parts by weight: 50 to 80 parts of polylactic acid, 20 to 50 parts of poly (butylene succinate), 6 to 15 parts of modified cotton fiber, 0.2 to 0.8 part of glyceryl monostearate, 1 to 3 parts of trimethylolpropane triacrylate and 0.4 to 1 part of distearyl thiodipropionate. The degradable composite non-woven fabric disclosed by the invention keeps excellent tensile strength, toughness and dimensional stability, and has a completely biodegradable characteristic; the composite material has good processability and usability, can be widely applied to the fields of medical treatment and public health, agricultural coverage, packaging materials and the like, conforms to the concept of green sustainable development, and has remarkable economic benefits and social values.

The invention relates to the technical field of delustering agents, in particular to a preparation method of a high-transparency silicon dioxide delustering agent. The preparation method comprises the following steps: S1, mixing water with low-molten iron glass to obtain a reaction solution; the preparation method comprises the following steps: mixing benzene, ethanol and distearyl thiodipropionate to obtain a modified solution; s2, acid and water glass are added into the reaction liquid for a reaction, and after the reaction, the modified liquid is added for aging; s3, sequentially performing acidification and secondary aging on a product obtained after aging to obtain slurry; s4, after the slurry is purified, PPG400 is added for drying, and the high-transparency silicon dioxide delustering agent is obtained. According to the preparation method, distearyl thiodipropionate and PPG400 are introduced in the preparation process, the defect of poor transparency of a traditional precipitation method is overcome, the pore volume is remarkably increased and the glossiness is reduced at low cost, the haze and transparency of a paint film are greatly improved, and high transparency and high extinction performance are achieved.

The utility model discloses a kind of high-efficiency plate-and-frame filter press for thiodipropionic acid production, belong to filter press technical field.The device includes workbench, hydraulic cylinder driven unfolding and folding subassembly and multiple filter plates.Unfolding and folding subassembly is linked multiple buckling subassemblies by pull rod, and the synchronous unfolding and vibration of filter plate are realized by cooperating trapezoidal arrangement telescopic subassembly;Filter plate bottom is equipped with clamping groove and clamping block, and it is convenient to quickly disassemble and replace;The design of the folding and sliding groove of the one side of workbench ensures that subassembly is smoothly folded.The utility model is directly cleaned in the gap between unfolded filter plate by using hydraulic drive synchronous unfolding filter plate and using telescopic subassembly impact force vibration filter residue, combined with cleaning device, without operating each filter plate, significantly improve filter residue cleaning efficiency and cleaning convenience, solve the problem that traditional filter press cleaning procedure is complicated and inefficient, applicable to efficient solid-liquid separation and maintenance in thiodipropionic acid production.

The invention discloses a hindered phenol antioxidant and a preparation method thereof in the field of high polymer material auxiliaries, and the antioxidant comprises a modified hindered phenol compound A, a modified hindered phenol compound B, tris (2, 4-di-tert-butylphenyl) phosphite, distearyl thiodipropionate, a hindered amine light stabilizer and an antioxidant carrier. The modified hindered phenol compound A is prepared by taking 4, 6-di-tert-butylresorcinol as a raw material, reacting the raw material with chloroethyl sulfonyl chloride in potassium hydroxide and N, N-dimethylformamide, then adding ethylenediamine for continuous reaction, and carrying out ice water precipitation, ethanol recrystallization and vacuum drying. The antioxidant is prepared by the following steps: adding the components into a high-speed mixer for premixing, transferring to a double-screw extruder for melt extrusion, granulating and drying.

The invention relates to a zinc ion battery electrolyte and a zinc metal negative electrode passivation layer constructed by the same. A reference electrolyte is prepared from any one or more of zinc sulfate, zinc bromide, zinc nitrate, zinc chloride, zinc perchlorate, zinc trifluoromethanesulfonate, bis (trifluoromethanesulfonimide) zinc salt and zinc acetate according to any proportion; and the electrolyte additive is 3, 3 '-thiodipropionic acid or 3, 3'-dithiodipropionic acid. The electrolyte provided by the invention generates a passivation layer capable of being repaired in situ through in-situ chemical reaction with a zinc metal electrode. The passivation layer effectively solves the problems of zinc dendrite, zinc corrosion and the like, remarkably enhances the tolerance of a zinc metal electrode to surface defects, and improves the cycle performance and the service life of the water-based zinc ion battery. In addition, the additive provided by the invention is wide in source, green and pollution-free, and meanwhile, the zinc ion battery provided by the invention is simple in preparation process, low in cost and easy to industrialize.

The invention relates to the field of materials, in particular to a high-strength antibacterial polypropylene nano-material and a preparation process thereof.The polypropylene nano-material is prepared by taking polypropylene, modified sodium alginate and modified nano-hydroxyapatite as main raw materials and taking dilauryl thiodipropionate and glycerol monostearate as auxiliary materials through melt blending and extrusion granulation. The modified sodium alginate is prepared from sodium alginate and phenylbiguanide through a chemical reaction, guanidyl groups have a sterilization effect, so that the prepared polypropylene nano-material has a strong antibacterial effect, the modified nano-hydroxyapatite is prepared by introducing rigid heterocyclic junctions into nano-hydroxyapatite, and the modified nano-hydroxyapatite has a good antibacterial effect. The rigidity and the mechanical property of the prepared polypropylene nano material are greatly improved, and the polypropylene nano material can be suitable for high-load scenes.

The invention provides a combined catalyst and application thereof, and belongs to the technical field of fine chemical engineering. The combined catalyst consists of a phase transfer catalyst, an antioxidant and a buffering agent, the phase transfer catalyst is a crown ether phase transfer catalyst; the antioxidant is one or more of dilauryl thiodipropionate, disteaxyl thiodipropionate, triphenyl phosphate and pentaerythritol diphosphite ester; and the antioxidant is one or more of dibutyl thiodipropionate, disteaxyl thiodipropionate, triphenyl phosphate and pentaerythritol diphosphite ester. The buffering agent is one or more of potassium carbonate, sodium hydroxide and sodium bicarbonate. The combined catalyst is high in activity, and when the combined catalyst is used for a reaction for synthesizing sodium thiocyanate and chloropropyltriethoxysilane, the conditions are mild, the dosage of the combined catalyst is small, control is easy, operation is easy, the synthesis reaction time is short, the yield is high, few by-products are generated, the production cost is reduced, and the yield and quality of the product are improved.

The application discloses a kind of silane crosslinking polyethylene pipe with light oxygen aging resistance of double-layer structure and preparation method thereof, belong to silane crosslinking polyethylene pipe field.The silane crosslinking polyethylene pipe of the application is designed as double-layer structure, by optimizing the composition of outer layer, so as to achieve the purpose of light oxygen aging resistance, wherein, compound tetra [beta- (3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, tris (2,4-di-tert-butylphenyl) phosphite, thiodipropionic acid distearyl ester are used as main antioxidant, and auxiliary antioxidant is added as quercetin stearate, synergistic antioxidant effect is improved, antioxidant performance and thermal oxygen stability are improved, self-made ultraviolet absorber is also added, with large molecular weight, can be firmly anchored in polyethylene matrix, reduce migration and volatilization, and then play more excellent ultraviolet resistance effect, and main antioxidant, auxiliary antioxidant and light stabilizer synergistic effect, reach the effect of significant light oxygen aging resistance.

The application provides a combination catalyst and application thereof, and belongs to the technical field of fine chemical industry.The combination catalyst is composed of a phase transfer catalyst, an antioxidant and a buffer agent; the phase transfer catalyst is a crown ether phase transfer catalyst; the antioxidant is one or more of dilauryl thiodipropionate, dioctadecyl thiodipropionate, triphenyl phosphite and pentaerythritol diphosphite; and the buffer agent is one or more of potassium carbonate, sodium hydroxide and sodium bicarbonate.The combination catalyst has high activity, and when used in the reaction of synthesizing sodium thiocyanate and chloropropyl triethoxysilane, the combination catalyst has mild conditions, small dosage, easy control, simple operation, short reaction time, high yield, few by-products, reduced production cost, and improved product yield and quality.

The invention discloses a desulfurization solvent capable of improving the carbonyl sulfide removal rate as well as a preparation method and application thereof. The desulfurization solvent comprises an alcohol amine solvent, a desulfurization synergist and a composite antioxidant, the alcohol amine solvent is a compound solution of N-methyldiethanolamine and organic steric hindrance amine; the structural formula of the organic steric hindrance amine is as follows: the desulfurization synergist comprises modified TiO2 nanotubes, zinc oxide, iron oxide, organic silicon, active metal nickel and diethyl thioaminomalonate; the composite antioxidant is prepared from thiodipropionic acid, ethylene diamine tetraacetic acid disodium salt and glycerol. N-methyldiethanolamine is compounded with 1-(2-ethoxyl)-4-(4-hydroxyl (2, 3-dimethylbutyl-3-yl)) piperazine with a steric hindrance effect, the 1-(2-ethoxyl)-4-(4-hydroxyl (2, 3-dimethylbutyl-3-yl)) piperazine has relatively strong alkalinity and can effectively improve the removal effect of carbonyl sulfide in the high-content carbonyl sulfide natural gas, and isopropyl can enable amine molecules to have a relatively strong steric hindrance effect, so that the removal effect of carbonyl sulfide in the high-content carbonyl sulfide natural gas is improved. Therefore, the catalyst has better selectivity on carbon dioxide, and has higher sulfide removal capacity and carbon dioxide retention capacity.

The application discloses a warm-mix bio-based asphalt regenerant and a preparation method thereof. The bio-based asphalt regenerant comprises 47-55 wt% of plant oil, 12-15 wt% of terpene phenol aldehyde resin, 5-8 wt% of antioxidant, 3-5 wt% of surfactant, 6-8 wt% of plasticizer, 6-8 wt% of stabilizer and 8-12 wt% of bio-based modifier. The preparation method comprises the following steps: preparing the stabilizer and algal extract; heating the plant oil in a reaction kettle; stirring the surfactant into the reaction kettle; stirring the terpene phenol aldehyde resin into the reaction kettle; stirring dilauryl thiodipropionate and vitamin E into the reaction kettle first, and then stirring furfural into the reaction kettle; after the temperature is increased, stirring chitin and sulfonated lignin into the reaction kettle first, and then stirring the algal extract into the reaction kettle; and stirring the plasticizer and the stabilizer into the reaction kettle to obtain the bio-based asphalt regenerant. The application can restore and supplement the missing components in the aged asphalt, rebalance the original chemical components and restore the performance of the aged asphalt.

This invention relates to a safe and environmentally friendly water-based coating for toys and its preparation method, belonging to the field of coating technology. The coating components include a bio-based waterborne polyurethane-acrylic interpenetrating network polymer, a dynamic covalent self-healing resin, functional fillers, and antibacterial agents. The bio-based waterborne polyurethane-acrylic interpenetrating network polymer is prepared by reacting castor oil-modified polyol, lysine diisocyanate, ethylhexyl palmitate, and dimethylolpropionic acid to obtain a prepolymer, which is then reacted with butyl acrylate, methyl methacrylate, and hydroxyethyl methacrylate. The dynamic covalent self-healing resin is prepared by reacting 3,3'-thiodipropionic acid, glycidyl methacrylate, and isobutyl palmitate to obtain a product, which is then reacted with methyl methacrylate and ethylene glycol dimethacrylate to obtain an oligomer, and finally reacted with a waterborne acrylic resin. The combined use of these components exhibits excellent adhesion, crack resistance, water resistance, abrasion resistance, and self-healing ability, and is safe and environmentally friendly.

The invention discloses environment-friendly conductive plastic and a preparation method thereof, and relates to the technical field of plastic. According to the invention, through an esterification reaction of 3, 5-di-tert-butyl-4-hydroxyphenylacetic acid and 1, 18-octadecane glycol, a long-chain alcoholic hydroxyl group is introduced to enhance the compatibility with polyethylene plastic, so that the product stably exists in the plastic and plays a role. The terminal hydroxyl group reacts with thiodipropionic acid to generate a novel antioxidant with a synergistic anti-oxidation effect, the phenolic hydroxyl group captures free radicals, and the thioester group consumes hydroperoxide, so that polyethylene oxidation is jointly prevented. In addition, the peel residues are added into the plastic, and after melt extrusion, the peel residues are semi-carbonized to form a microporous or layered carbon structure, so that the interface bonding force with the plastic is enhanced, and the strength is improved. Metal salts in the fruit peels are remained in a carbon layer, so that the formation of a continuous and compact carbon layer is promoted, and the flame-retardant effect is improved.

The present application relates to the technical field of antioxidant preparation, and particularly relates to a method for removing the smell of thiodipropionic acid. The method comprises the following steps: preparing thiodipropionic acid solution by adding water to thiodipropionic acid, then passing water vapor to perform steam stripping, then passing ozone to perform oxidation treatment, and then performing cooling crystallization, centrifugation and drying. The method can improve the smell stability of thiodipropionic acid during storage.

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 application discloses a wear-resistant and flame-retardant cloth wire and a preparation method thereof, and relates to the technical field of power cables. The application comprises a copper conductor and an insulation layer. The insulation layer is made of mixing materials, and the mixing materials comprise the following raw materials in mass parts: 1000-1100g parts of wear-resistant and toughening masterbatch, 3-3.4 parts of p-hydroxyanisole, 160-175 parts of flame-retardant crosslinking agent, 12-13 parts of photoinitiator 184, and 12-13 parts of benzophenone. The wear-resistant and toughening masterbatch comprises the following raw materials: high-density polyethylene resin, antioxidant 1010, antioxidant 168, dilauryl thiodipropionate, synergistic microspheres, crosslinking aid, and hydroxymethylpropane trimethyl acrylate. In the application, the introduction of the flame-retardant crosslinking agent, the synergistic microspheres and other raw materials effectively improves the flame retardance, wear resistance, crack resistance and low-temperature resistance of the crosslinked polyethylene-based insulation layer. Therefore, the application has a more extensive application prospect.

The invention discloses a degradable antibacterial fiber and a preparation method thereof, and relates to the technical field of fibers. When the degradable antibacterial fiber is prepared, 2-methyl benzoic acid firstly reacts with methanol, then reacts with hydrazine hydrate, and finally reacts with S-iso-methyl thiourea methyl sulfate to prepare the antibacterial agent. The preparation method comprises the following steps: carrying out dehydration condensation on 1, 4-butanediol, 1, 5-glutaric acid, a modified flame retardant and 1, 2, 3, 4-cyclobutanetetracarboxylic dianhydride to prepare modified polyester; the preparation method comprises the following steps: reacting nano titanium dioxide with hydrolyzed 3-aminopropyltrimethoxysilane, and then reacting with thiodipropionic acid to obtain the modified nano titanium dioxide. And mixing the modified polyester with the modified nano titanium dioxide, and carrying out melt spinning to obtain the modified polyester fiber. And treating the modified polyester fiber with a post-treatment solution prepared from the antibacterial agent to obtain the degradable antibacterial fiber. The degradable antibacterial fiber prepared by the preparation method disclosed by the invention has excellent degradability and antibacterial property.

The application discloses a hindered phenolic antioxidant and a preparation method thereof in the field of high polymer material additives, and the antioxidant comprises modified hindered phenolic compound A, modified hindered phenolic compound B, tris(2,4-di-tert-butylphenyl) phosphite, dioctadecyl sulfide dipropionate, hindered amine light stabilizer and an antioxidant carrier. The modified hindered phenolic compound A is prepared from 4,6-di-tert-butyl resorcinol as raw material, which is reacted with chloroethyl sulfonyl chloride in potassium hydroxide and N,N-dimethylformamide, then ethylenediamine is added for continuous reaction, and the product is precipitated by ice water, recrystallized by ethanol and dried in vacuum. The antioxidant is prepared by pre-mixing the components in a high-speed mixer, transferring to a double-screw extruder for melt extrusion, granulation and drying.

The invention discloses a preparation process of dimethyl 3, 3 '-dithiodipropionate, and belongs to the technical field of preparation of 3-isothiazolinone bactericide intermediates, and the preparation process comprises the following steps: mixing methyl acrylate, sulfur particles and ammonia water, and respectively introducing the mixture into a three-section tubular reactor for continuous reaction, then carrying out reduction reaction in a sodium sulfite aqueous solution, and carrying out post-treatment to obtain a 3, 3 '-dimethyl dithiodipropionate product; by utilizing the method, not only can the high-content dimethyl 3, 3 '-dithiodipropionate be obtained, but also the production yield is high, few impurities exist, and the product purity is high; the production process is easy to control, the energy consumption is reduced, the production efficiency is improved, meanwhile, the production process is safe and controllable, intermediate impurities are turned into wealth and converted into products, the purity and yield of the products are improved, and two purposes are achieved.

The application discloses a method for preparing thiodipropionic acid by using a series connection dynamic kettle type reactor, S1 reaction liquid configuration, S2 feeding, S3 heat exchange, S4 residence, and S5 discharging; after reaction residence for a certain time, the material is discharged from the first dynamic kettle type reactor, enters the second dynamic kettle type reactor, and after further acidification reaction, thiodipropionic acid liquid is obtained. The preparation method can effectively solve the problems of high content of acrylic acid polymer, low raw material conversion rate, low yield, safety risk and the like in the traditional process; the thiodipropionic acid is generally prepared by using an intermittent reaction kettle in the prior art, and the application provides a method for preparing thiodipropionic acid by using a series connection dynamic kettle type reactor, so that the amount of acrylic acid is reduced, energy consumption is saved, the content of polyacrylic acid is reduced, and the yield and quality of finished products are improved.