1196 results about "Long chain" patented technology

The invention discloses a supported nickel catalyst for preparing 1, 3-propylene glycol through hydrogenation of 3-hydroxypropionaldehyde as well as a preparation method and application of the supported nickel catalyst, and relates to the technical field of catalysts. The modified long-chain multi-carbon inducer is used, and a special long-chain molecular structure and a branched chain group of the inducer can effectively and selectively adsorb and occupy a micropore impregnation site; the preparation method has the beneficial effects that more active component nickel species are obviously promoted to be dispersed in main reaction confinement spaces such as mesopores and macropores and interact with the carrier to form effective active sites, and active component steeping liquor is inhibited from entering micropore channels due to capillary action; the active site failure caused by agglomeration of nickel species in micropores in the subsequent drying and roasting process of the catalyst precursor is avoided, the efficient and directional reaction is ensured, the generation of by-products is greatly reduced, the pressure is relieved for the subsequent product rectification separation, and the final product purity is improved. The catalyst provided by the invention can still keep an excellent catalytic effect when the air speed of a 3-hydroxypropionaldehyde solution is increased to 6.5 h <-1 >.

The invention discloses a high-reliability PbS quantum dot film, a preparation method thereof and a photoelectric device. The preparation method comprises the following steps: 1) obtaining a first quantum dot solution; 2) adding medium-chain and long-chain amine; 3) adding an anti-solvent; 4) obtaining medium-chain and long-chain amine modified PbS quantum dot solids; 5) obtaining a second quantum dot solution; (6) forming a PbS quantum dot coating; 7) forming a mercaptan solution; 8) coating the PbS quantum dot coating with a mercaptan solution; (9) annealing treatment; 10) forming a new PbS quantum dot coating, and coating the new PbS quantum dot coating with a mercaptan solution; according to the PbS quantum dot thin film and the preparation method thereof, through the induction and synergistic effect of halogen atoms, the binding capacity of halogenated mercaptan ligands and the surface of the PbS quantum dot thin film is enhanced, the surface defect state of the PbS quantum dots is effectively inhibited, and the reliability of the PbS quantum dot thin film and a photoelectric device under the conditions of high temperature, high humidity and long-time illumination is remarkably improved.

The invention discloses a water-based single-component super-amphiphobic refrigeration coating, a coating and a preparation method of the coating, and relates to the technical field of coatings. 20-35 parts of a second filler; 5-10 parts of a third filler; 20-35 parts of a film-forming substance, 1-9 parts of an auxiliary agent and 3-50 parts of water; the first filler comprises fluorine-containing silane modified fumed silica; the second filler comprises at least one of long-chain silane modified precipitated barium sulfate, long-chain silane modified calcium carbonate and long-chain silane modified hollow glass beads; the third filler comprises an infrared emission filler treated by an organic silicon modifier. By modifying the filler, the purposes of stable dispersion and functional synergy of low-surface-energy substances and high-proportion inorganic nano filler in a water-based system are achieved.

The invention discloses a preparation method of a coarse-denier high-strength polyethylene fiber and a polyethylene fiber.The preparation method comprises the steps that a nano modifier is prepared, the nano modifier is hyperbranched polyethylene modified nano SiO2, and polyethylene powder, white oil, the nano modifier and an antioxidant 1010 are mixed to form a mixed solution; and extruding the mixed solution to form gel fibers, standing the gel fibers to obtain oil, and carrying out three-stage extraction with an ionic liquid, drying and stretching to form the polyethylene fibers. The nano modifier is adopted as a raw material of the polyethylene fiber and is hyperbranched modified nanoparticles, the dispersion uniformity of the nanoparticles can be ensured due to small volume steric hindrance of the nanoparticles, and long-chain alkyl outside the particles and a polyethylene molecular chain have very good compatibility; meanwhile, bidirectional permeation and diffusion of the extraction agent and the solvent are greatly promoted, the extraction process is accelerated, solvent residues can be reduced, and the mechanical property of the prepared fiber is effectively improved.

The invention relates to a recyclable easily-degradable macromolecular surfactant for cleaning oily sludge and application of the recyclable easily-degradable macromolecular surfactant. The macromolecular surfactant is prepared by taking acrylamide, methacrylic acid long-chain alkyl ester and tertiary amino substituted methacrylate as raw materials through free radical polymerization. The macromolecular surfactant is dissolved in water to prepare a cleaning solution, and oily sludge can be efficiently eluted. CO2 and N2 are sequentially introduced into the oil-containing emulsion after the oil-containing sludge is cleaned, or diluted hydrochloric acid and a diluted alkali aqueous solution are sequentially added, the hydrophilic-hydrophobic property of the macromolecular surfactant is changed through pH regulation and control, separation of the macromolecular surfactant and an oil phase is achieved, petroleum resources are recycled, and recycling of the cleaning solution containing the macromolecular surfactant is achieved. The residual macromolecular surfactant in the cleaned deoiled sludge can be degraded under the action of environmental microorganisms.

The invention belongs to the technical field of organic synthesis, and provides a preparation method of a cationic lipid compound, which comprises the following steps: (1) reacting 1, 5-dihalopentane, 2-tert-butyl glycolate and alkali to obtain a product G; (2) hydrolyzing the product G under an acidic condition to obtain a product H; (3) carrying out esterification reaction on the product H, the raw material C, 4-dimethylaminopyridine and a condensing agent in dichloromethane to obtain a product J; and (4) carrying out amination reaction on the product J, the raw material L and alkali in acetonitrile to obtain the cationic lipid compound. Compared with the prior art, the method has the relatively remarkable advantages that when the first part of halogenated long-chain alkyl ester H is synthesized by the method, 1, 5-dihalopentane and 2-tert-butyl glycolate are used as raw materials, the halogenated long-chain alkyl ester J is synthesized by a simple method, the product is obtained at a higher yield in synthesis, and the method is suitable for kilogram-level production. The route synthesis only comprises four steps of chemical reactions, and is suitable for industrial production.

The invention discloses high-rubber-impact-resistance co-polypropylene and a preparation method thereof. The preparation method comprises the following steps: propylene is subjected to a homopolymerization reaction in a catalytic system; and adding the long-chain substituted diene mixed with the solvent in a copolymerization stage, and introducing mixed gas of propylene and other monoene for reaction to obtain the high-rubber anti-impact co-polypropylene. The long-chain substituted diene mixed with the solvent is added in the copolymerization stage, the crosslinking degree and the product uniformity of the high-rubber-impact-resistance co-polypropylene prepared by the method disclosed by the invention are remarkably improved, the introduction amount of the long-chain substituted diene is reduced, the cost is reduced, and the production efficiency is improved. In addition, the content of a rubber phase is broken through, the particle surface is not sticky, the viscosity index change is small after heating, the distribution and fluidity of the propylene copolymer are effectively controlled, and the low-temperature impact toughness is higher.

The invention discloses an organic long-chain zinc salt for a zinc secondary battery electrolyte and a preparation method and application thereof. The organic long-chain zinc salt comprises a long-chain group, an acidic group and zinc ions, the long-chain group comprises at least one of substituted or unsubstituted C8-16 alkyl groups, and the acidic group comprises at least one of a sulfonic acid group, a phosphoric acid group and a sulfuric acid group. The organic long-chain zinc salt serving as an electrolyte salt of the zinc secondary battery can be adsorbed on the surface of zinc to form a protective layer, so that the cycle life and the capacity retention ratio of the zinc secondary battery are effectively improved.

The present invention relates to a non-noble metal long-chain alkane dehydrogenation catalyst, which uses CeO2 and a transition metal M as main active components, and the mass percentage of the transition metal M is 0-30 wt%; wherein M is one or a combination of more of Fe, Co and Ni. Meanwhile, the invention also discloses a preparation method and application of the catalyst. The catalyst provided by the invention shows good dehydrogenation activity and stability in an inert atmosphere. An alternative solution which is low in cost, high in performance and easy to operate is provided for a long-chain alkane dehydrogenation process.

The invention provides an antibacterial high-barrier starch-based plastic bottle and a preparation method thereof.The preparation method comprises the steps that firstly, titanate generates nano titanium dioxide in situ in starch through acid catalysis, starch is subjected to in-situ hybridization modification, and nano titanium dioxide in-situ hybridization starch is prepared; then adding nano inorganic barrier powder, and then adding a long-chain silane coupling agent to modify the nano titanium dioxide in-situ hybridized starch and the nano inorganic barrier powder to obtain a modified starch compound; performing vacuum kneading and drying until the water content is lower than 0.5%, and adding an antibacterial lubricant for plasticizing to obtain a plasticized material; and finally, carrying out melt blending and granulation with polyolefin resin, and carrying out extrusion blow molding. The environment-friendly and low-cost starch-based material is kept, meanwhile, the comprehensive performance of the product is remarkably improved, the surface contact angle of the product is 110 degrees or above, the antibacterial rate is 97% or above, and the oxygen permeation amount and the water vapor permeation amount are 100 cm / (m.24h. Atm) and 4 g / (m.24h) or below respectively.

The present disclosure provides a process. In an embodiment, the process includes providing a neat ethylene / propy-lene / non-conjugated polyene terpolymer (n-terpolymer) having a Mooney viscosity (ML (1+4) at 125C) less than 100 Mooney units (MU). The process includes exposing the n-terpolymer to electron beam radiation at a dosage from 0.2 megaRad (MRad) to 1.3 MRad. The process includes forming a branched ethylene / propylene / non-conjugated polyene terpolymer (b-terpolymer) having a Mooney viscosity ML (1+4) at 125C from 25 MU to 135 MU.

The invention relates to an in-situ copolymerized and hybridized flocculant and a preparation method and an application method thereof, the in-situ copolymerized and hybridized flocculant comprises an inorganic metal, an organic monomer and a composite natural polymer material package, and the flocculant is formed by segmented in-situ polymerization of the inorganic metal, the organic monomer and the composite natural polymer material package, the inorganic metal is treated metal solid waste leachate; according to the preparation method, a segmented in-situ path of first induced polymerization and then skeleton hybridization is adopted; the application method adopts a one-step conditioning mode. Solid waste leachate is used as a reaction medium, an NVCL monomer is dissolved and polymerized to form an active long chain, then a natural polymer material bag is introduced to realize deep hybridization of space connection and chemical crosslinking, and the floc strength and filter pressing dehydration property in sludge flocculation treatment are improved through a synergistic mechanism. Rapid flocculation and deep dehydration under different mud properties are realized, and the green and environment-friendly properties are improved.

The application discloses an amino acid cleansing product and a preparation method thereof. The amino acid cleansing product comprises the following raw material components in percentage by mass: a surfactant composition 10-30%, an amphoteric or non-ionic surfactant 1-10%, citric acid 0.05-0.5%, a humectant 1-5%, 0.5-2% isostearyl alcohol, 0.1-0.5% phytosteryl dimer dilinoleate, 0.5-5% sodium chloride, 0.3-1% inulin lauryl carbamate, and the balance is water; the surfactant composition comprises long-chain fatty acyl glycolate. The amino acid cleansing product of the application maintains uniform appearance under high temperature, low temperature and repeated freezing and thawing conditions, has good physical and chemical stability and compatibility, and at the same time, realizes sufficient cleaning and has less damage to the stratum corneum structure, thereby showing good cleaning and mildness.

The invention relates to the technical field of high polymer material ingredients, and discloses a low-linear expansion coefficient PCR-PP bumper material and a preparation method thereof.The low-linear expansion coefficient PCR-PP bumper material comprises a low-expansion inorganic core, an interface gradient coupling agent and a surface activity modifier, the interface gradient coupling agent forms a brush-like topology grafting layer with the grafting rate of 2.5%-4.5% on the surface of the low-expansion inorganic core, and the surface activity modifier forms a brush-like topology grafting layer with the grafting rate of 2.5%-4.5% on the surface of the low-expansion inorganic core; the surface activity regulator performs steric hindrance locking on the brush-like topological grafting layer through long-chain alkyl of the surface activity regulator. According to the preparation method, a gradient distribution interface layer with specific grafting density and chain segment length is constructed on the periphery of an inorganic core, so that an interface chain segment actively absorbs thermal expansion displacement of a matrix by utilizing conformation transformation; the thermal stress vector discontinuity between the filler and the matrix is eliminated, and an interface mechanical response mode is reconstructed to inhibit interface delamination and microcrack initiation while the overall linear expansion coefficient is inhibited.

The application discloses application of 5,8,11-eicosatrienoic acid in prevention and treatment of plant fungal diseases and belongs to the field of pesticide chemistry. The 5,8,11-eicosatrienoic acid mainly prevents and treats diseases caused by the oomycete class capsicum phytophthora, the compound is a long-chain unsaturated fatty acid, has an antifungal disease effect and can be used as a fungicide to prevent and treat plant diseases. The compound can effectively prevent pathogenic bacteria from invading plants by inhibiting mycelium growth, enhancing cell membrane permeability and interfering with the spore sac release process, and is further used for preventing and treating huge plant fungal diseases. Biological tests show that the compound has a significant concentration-dependent inhibitory effect on the mycelium growth of the capsicum phytophthora, and the half effective inhibitory concentration (EC50) is 60.2 µg / mL. At a concentration of 200 µg / mL, the inhibition rate is more than 83%, the 5,8,11-eicosatrienoic acid can effectively inhibit the release of the capsicum phytophthora spore sac, and the EC50 is 156.3 µg / mL. At a concentration of 200 µg / mL, the inhibition rate is morethan 77%.

The application discloses a super-long chain (carbon atom number in a hydrophobic tail chain is greater than or equal to 18) polyoxyethylene ether surfactant thickened aircraft deicing and anti-icing liquid and a preparation method. The super-long chain polyoxyethylene ether surfactant thickened aircraft deicing and anti-icing liquid comprises the following components and mass percentages: alcohol 40-69%, deionized water 30-59%, and surfactant 0.2-2.0%, wherein the surfactant is a polyoxyethylene monomethyl ether ester of docosanoic acid (C 22 -350) with the following structural formula: The application obtains a deicing and anti-icing liquid which is good in deicing and anti-icing performance and relatively environment-friendly, solves the problems that a polymer-based deicing and anti-icing liquid is easy to be rehydrated to form a hydrated gel on the surface of an aircraft and that a surfactant itself or other additives cause corrosion on the surface of the aircraft under the premise of ensuring the deicing and anti-icing effect.

The invention belongs to the technical field of fine chemical synthesis, belongs to a nonionic short fluorine chain surfactant, and relates to a preparation method of a fluorinated polyether surfactant. The preparation method comprises the following steps: reacting trimethylolethane with a hydrogen bromide acetic acid solution to prepare an intermediate 1; reacting the intermediate 1 in an alkaline environment without an organic solvent to prepare an intermediate 2; reacting the intermediate 2 with pentafluoropropanol under the action of potassium hydroxide and a catalyst 1 to prepare a fluorinated monomer; finally, the fluorinated monomer is subjected to ring opening polymerization under the action of an initiator and a catalyst 2, and the fluorinated polyether type surfactant is prepared. The method has the advantages of easily available raw materials, mild reaction conditions, simple synthesis, low cost, high yield and short fluorine chain of the product, can replace a long-chain fluorine-containing surfactant which is difficult to degrade, and can be used as an additive in the fields of photoresists, coatings, adhesives and the like. The surface tension can be obviously reduced, the surface defects of a coating can be reduced, and the appearance can be improved by adding a very small amount of the surface tension reducing agent.

The application provides a triarylmethane derivative, a pigment dispersion liquid, a preparation method thereof and a photoresist, and relates to the field of photoresists. The structural general formula of the triarylmethane derivative is: wherein X1 is selected from one of long-chain alkyl groups with a length of C1-C12, X2 is selected from hydrogen or an alkyl group, X3 is selected from one of H, an alkyl group and an aromatic group, and Q is selected from one of a carboxyl group, a sulfonic acid group and a phosphoric acid group. The triarylmethane derivative can generate strong van der Waals force and pi-pi conjugation effect with pigment molecules in a colorant by virtue of the large-plane conjugated triarylmethane skeleton, so as to be firmly anchored on the surface of the pigment particles; the strong polar functional groups such as the sulfonic acid group in the molecular structure of the triarylmethane derivative are combined with the alkaline dispersant, the side long-chain alkyl groups fully act on the dispersion medium, and the re-aggregation of the nano pigment particles is effectively prevented through strong steric hindrance and electrostatic stabilization mechanism, so that the problem of poor dispersion stability is solved.

The application belongs to the technical field of polymer material adhesive, and particularly discloses a polyurethane adhesive and a preparation method thereof. The polyurethane adhesive is in the form of emulsion, the emulsion particles in the polyurethane adhesive have polyurethane long chains capped by dopamine and containing epoxy group side chains, and the polyurethane long chains have a core-shell structure with hydrophilic groups facing outward and hydrophobic groups facing inward. The above structure enables the polyurethane adhesive to fully exert the biomimetic mussel adhesion effect of dopamine and achieve strong bonding at various interfaces. The emulsion particles can not only effectively improve the stability of the emulsion, but also enable the adhesion groups of dopamine to be enriched on the surface of the emulsion particles, thereby significantly improving the adhesion effect. When the polyurethane adhesive is applied for curing, the end groups of dopamine can be coordinated and crosslinked with mild metal ions, thereby exerting bonding strength, and the dopamine capping can completely eliminate the -NCO groups in the traditional polyurethane adhesive, thereby overcoming the disadvantage of insufficient strength.

The present application belongs to the technical field of glass fiber sizing agent, and particularly relates to an anti-creep glass fiber sizing agent and a preparation method thereof. The anti-creep glass fiber sizing agent comprises effective components and water, and the solid content of the anti-creep glass fiber sizing agent is 3-12%. The effective components comprise the following components according to weight percentage: maleic anhydride modified long-chain branched polyolefin wax 65.5-86.9 wt.%, coupling agent 5-10 wt.%, nucleating agent 1-8 wt.%, physical cross-linking component 5-12 wt.%, initiator 0.1-0.5 wt.%, and surfactant 2-4 wt.%. The present application can effectively solve the problem of insufficient anti-creep ability of the glass fiber reinforced polypropylene material in the prior art, and at the same time, the material has good mechanical properties and fatigue resistance, which plays an important role in improving the long-term dimensional stability of the polypropylene material.

The invention relates to a polyurethane thickening agent and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out polymerization reaction on diisocyanate and polyether to obtain a corresponding prepolymer containing a branched chain, and then, carrying out reaction on the prepolymer and corresponding alcohol or amine containing an alkyl chain to obtain the polyurethane thickening agent. According to the thickening agent, an allophanate chain segment is introduced to a long chain of polyurethane, so that the thickening performance is remarkably improved, and the thickening agent has excellent salt resistance and can still keep a stable thickening effect even in a salt-containing system. The preparation method is simple and convenient in process, mild in condition and relatively low in cost. In addition, the product does not contain tin compounds, is low in VOC content and has the characteristic of environmental friendliness.

This invention relates to a microbial agent with highly efficient plastic degradation properties and its application, wherein the microbial agent contains *Cryptococcus lauriensis* strain with accession number CCTCC NO: M 2026232. Papiliotrema laurentii SNP7-2P strain and / or Achromobacterium with accession number CCTCC NO: M 2026231 Achromobacter strains FJ1-2L. These two microbial strains exhibit varying degrees of degradation effects on long-chain polymers in plastics, effectively and environmentally addressing plastic pollution and making them suitable for preparing green and environmentally friendly degradable plastic products.

The invention relates to the technical field of dye separation, and discloses a loose nanofiltration membrane and a preparation method and application thereof, the loose nanofiltration membrane comprises a porous support membrane, and a polyesteramide separation layer formed on the porous support membrane through one-step interfacial polymerization of nucleoside monomers and multi-acyl chloride monomers. The nucleoside monomer is one or more than two of adenosine, guanosine and cytidine nucleoside. The nucleoside monomer with a long-chain structure, a branched-chain structure, a rigid twisted structure and a plurality of hydrophilic reaction sites is selected as an interfacial polymerization water-phase monomer, so that the loose nanofiltration membrane is endowed with excellent permeation and separation performance. The membrane has a high rejection rate on dye molecules such as Congo red and methyl blue, also has high water permeability and extremely high dye / inorganic salt separation selectivity, and shows good application potential in the aspects of dye production and purification and dye wastewater recovery.

Provided in the present invention are a functionalized monomer, a raw material composition containing same for hydrogenated nitrile butadiene rubber, and a preparation method for hydrogenated nitrile butadiene rubber. In the functionalized monomer, a hydroxyl group, an ether group, an ester group and a long-chain alkyl branched structure are integrated into one macromolecular chain; and the functionalized monomer subsequently serves as a raw material monomer for preparing hydrogenated nitrile butadiene rubber, which can obtain hydrogenated nitrile butadiene rubber having better cold resistance and oil resistance.

The invention relates to a sealing material and a decoloring kettle applied to intermediate synthesis, and belongs to the technical field of composite materials. The compatilizer with a phosphoric acid structure is prepared, the compatilizer is used for treating and modifying the aluminum filler, a quaternary ammonium salt structure and a long-chain alkyl structure are introduced to the surface of the modified aluminum filler, the quaternary ammonium salt structure can generate electrostatic attraction with sulfonic acid groups in perfluorosulfonic acid resin, and the long-chain alkyl structure can generate long-chain alkyl groups in the perfluorosulfonic acid resin; the long-chain perfluoroalkyl structure can be entangled with a polytetrafluoroethylene resin molecular chain, and the two effects are synergistic, so that the binding capacity of the aluminum filler and the polytetrafluoroethylene-perfluorosulfonic acid resin composite material is effectively improved, and a polytetrafluoroethylene phase and a perfluorosulfonic acid resin phase can be bridged; the overall mechanical property of the composite material is effectively improved.

The invention relates to a low-VOCs acrylic resin water-based coating and a preparation method thereof, and belongs to the technical field of high polymer materials and chemical coatings, the low-VOCs acrylic resin water-based coating comprises the following raw materials by weight: 40-80 parts of a modified acrylic resin emulsion, 0-30 parts of a pigment filler, 1-5 parts of a water-based auxiliary agent, 10-30 parts of deionized water and 0.5-2 parts of a post-addition cross-linking agent; the modified acrylic resin emulsion is prepared from a core-layer monomer mixture and a shell-layer monomer mixture through a core-shell emulsion polymerization process, and the shell-layer monomer mixture comprises a functionalized internal plasticizing monomer and a self-crosslinking functional monomer. The monomer is prepared by reacting long-chain fatty alcohol with diisocyanate to prepare an isocyanate-terminated prepolymer and then grafting the isocyanate-terminated prepolymer with a hydroxyl-containing acrylic monomer, a long-chain alkyl structure provided by the long-chain fatty alcohol plays a remarkable internal plasticizing role on the surfaces of latex particles, and the friction force between polymer chain segments is effectively reduced.

The invention discloses an epoxy resin polymer, a composite material and a preparation method of the epoxy resin polymer, the epoxy resin polymer comprises a chain segment unit and a plurality of crosslinking sites, the chain segment unit comprises a dynamic bond, a cyclic structure and a long-chain structure, the mass R of the chain segment unit is 115-250, and the mass R of the chain segment unit is 1-10. R is the ratio of the weight-average molecular weight Mw of the epoxy resin polymer to the number of the crosslinking sites, the unit of the weight-average molecular weight Mw of the epoxy resin polymer is g / mol, and R is a dimensionless number. According to the epoxy resin polymer disclosed by the invention, the epoxy resin polymer can have a good self-repairing function, and the epoxy resin polymer can also have good rigidity and toughness.

The invention discloses a preparation method of a slurry-extracting and gas-retaining concrete admixture, which is characterized in that dodecenyl succinic anhydride, ethanediamine or hexamethylenediamine and caprolactam are used as raw materials, and a carboxyl-terminated polyamide monomer (PAMA) with a long-chain olefin hydrophobic structure is synthesized through amidation and ring-opening reaction. And carrying out free radical copolymerization on the monomer, acrylic acid, a polyether macromonomer (HPEG / TPEG), hydroxyethyl acrylate, hydroxypropyl acrylate and the like in an aqueous solution to prepare a target additive. According to the invention, the self-synthesized PAMA monomer is introduced, and a long-chain hydrophobic structure in molecules of the PAMA monomer can be directionally adsorbed on the surfaces of cement particles to form a stable microscopic hydrophobic region and has a synergistic effect with the acrylate monomer, so that the gas-retaining property and the slurry extraction effect of the concrete are remarkably enhanced, and the problems of bleeding and segregation are effectively solved. The method is simple in process, the product is excellent in comprehensive performance, and the compounding process is simplified.

This invention relates to the field of petroleum extraction technology, and discloses a compound and its preparation method, an acrylamide copolymer and its preparation method and application. The compound has the structure shown in formula (1): wherein M is H, sodium, potassium or NH4; 1≤n1≤12, 1≤n2≤19; the compound simultaneously has hydrophilic polyoxyethylene ether and sulfonic acid groups, as well as hydrophobic alkyl long chains, and the interfacial activity can be controlled by adjusting the length of the hydrophilic and hydrophobic segments;

A complex consisting of lipoic acid or a salt thereof, a chelating agent such as a salt of ethylene diamine tetraacetic acid (EDTA) or analogous compounds and an ester of ascorbic acid with long-chain fatty acids, in particular ascorbyl palmitate inhibits the pigmentation of teeth induced by chlorhexidine and salts thereof. In addition to the depigmenting complex, the formulations of the invention, in the form of gels, mouthwashes, toothpastes or periodontal sprays, may contain other ingredients such as hyaluronic acid or hyaluronates, glycerophosphocholine, sweeteners, flavourings, buffering agents, viscosifying agents, mucoadhesive and filming agents, solvents, co-solvents, surfactants.