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47results about How to "Improve heat and humidity stability" patented technology

Preparation method for toughening type leather tanning agent

The invention relates to a preparation method for a leather tanning agent, in particular to a preparation method for a leather tanning agent with function of strengthening and toughening collagenous fibers. The leather tanning process is a qualitative change process converting raw hide into leather, and can endow the leather with good heat and humidity resistant stability, flexibility and physical and mechanical properties; however, a chrome tanning agent commonly adopted has serious harm to the environment, while a conventional non-chrome tanning agent is hard to meet the requirement on good service performance of the leather. The preparation method takes montmorillonite and acrylic monomers as raw materials, and adopts a monomer in-situ intercalation polymerization method to synthesize the toughening type leather tanning agent; and the toughening type leather tanning agent is used for tanning the leather, can greatly improve the strength and toughness of crust leather, and can reduce the dosage of the chrome tanning agent by 75 percent.
Owner:SHAANXI UNIV OF SCI & TECH

Acrylic resin/SiO2 nano composite tanning agent and preparation method thereof

The invention relates to an acrylics / SiO2 nano-composite tanning agent. The nano-composite tanning agent appears to be light yellow or yellow semitransparent ropy liquid, the mass concentration is 20 to 35%, the viscosity is 500 to 1000MPa.s, the pH value is 5 to 8, and the storage stable period is over 12 months. With only 2% (relative to the leather weight) chromium powder, the nano-composite tanning agent can thicken the leather by 124.5%, the shrinkage temperature reaches to 95 DEG C.; compared with a chrome tanned leather, a leather tanned by the nano-composite tanning agent has a tensile strength, peeling strength and elongation at break improved by 51.8%, 8.2% and 13.3% respectively, has no obvious stratification or sedimentation during over 12 months of storage period. Water is used as solvent when prepared, which is low-cost and pollution-free; the preparing technology is simple, the reaction is mild, the polymerization process is easy to control, so that the nano-composite tanning agent is easy to realize industrial production, the synthesized material is inexpensive and easy to obtain as well.
Owner:HENAN UNIVERSITY

Dry powder inhalation medicine composition and preparation method thereof

The invention provides a dry powder inhalation medicine composition and a preparation method thereof. The composition is prepared from a coating agent with a specific particle size characteristic, lactose monohydrate with a specific particle size characteristic for a carrier and a micronized medicinal active ingredient, wherein the coating agent is an inhaling magnesium stearate or a mixture of the inhaling magnesium stearate and micronized lactose monohydrate; and the medicinal active ingredient is selected from at least one of glycopyrronium bromide, umeclidinium, indacaterol, formoterol, vilanterol, fluticasone and pharmaceutically available salt of the active ingredients. The preparation method comprises the following steps of sufficiently mixing and coating the coating agent and the lactose monohydrate, and uniformly mixing with the micronized medicinal active ingredients.
Owner:SICHUAN HAISCO PHARMA CO LTD

Transparent conductive film with single layer structure, preparation method and application thereof

The invention discloses a transparent conductive film with a single layer structure, a preparation method and application thereof. The preparation includes: putting a cleaned substrate into a vacuum chamber of a vacuum magnetron sputtering device, filling argon when the vacuum degree of the chamber is 1*10<-4>-7*10<-4>Pa, and controlling the total air pressure at 0.16Pa, adjusting the sputtering power of a target material to 10-60W, then opening a sample baffle plate, and employing direct current magnetron sputtering technique for deposition on the substrate surface to obtain the transparent conductive film. The transparent conductive film is composed of silver and a metal oxide. By direct sputtering of an alloy target composed of silver and the metal oxide or co-sputtering of silver and ametal oxide target, the transparent metal conductive film with good continuity and stability under a small thickness can be prepared, thereby reaching the purposes of lowering the structural complexity and reducing material consumption.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

Method for tanning sheepskin through synergy of organic amine and epoxy resin composition tanning agent

The invention discloses a method for tanning sheepskin through synergy of organic amine and an epoxy resin composition tanning agent. The method comprises the steps that softened or acid removing sheepskin is processed by an organic amine bath lotion, and then the epoxy resin composition tanning agent is added for tanning. As the organic amine permeates into skin fibers, the organic amine can cooperate with the epoxy resin composition tanning agent to make amido of the organic amine and amido on skin collagen fibers have a reaction, a net-shaped crosslink structure is formed, and accordingly the damp heat resistance stability of leather is improved, the epoxy resin can serve as the main tanning agent to tan the sheepskin, the tanning performance is improved, the tanned sheepskin leather isclear in grain surface, rich in body, pure white in color and good in yellowing resistance performance, and the storage life of the tanned leather is longer than six months at the room temperature.
Owner:CHINA LEATHER & FOOTWEAR IND RES INST +1

Method for preparing nano-composite tanning agent containing montmorillonite and silica particles

The invention relates to a method for preparing a nano-composite simultaneously containing montmorillonite and silica particles, in particular to a method for preparing nano-composite tanning agent simultaneously containing montmorillonite and silica particles by using an in-situ polymerization method. The chrome tanning agent is one of the most commonly-used tanning agent in the leather industry, however, chromium (VI) has the problems of high toxicity and environmental pollution. By introducing acrylic monomers, the nano-composite tanning agent simultaneously containing montmorillonite and silica particles is prepared from montmorillonite and nano-particles with the surface thereof containing double-bond silica by using the in-situ polymerization method. By using the nano-composite tanning agent (6%) prepared by the invention to tan pickled goat skin, the resistance of crust leather to wet heat can be increased to plus of minus 75 DEG C; and the crust leather is superior in other properties, thereby meeting the requirements for the production of wet white leather and reducing the consumption of chrome tanning agent.
Owner:SHAANXI UNIV OF SCI & TECH

Method for preparing basic chromium sulfate-chrome tanning agent by using lignite wax as reducing agent

The invention discloses a method for preparing a basic chromium sulfate-chrome tanning agent by using lignite wax as a reducing agent. The method comprises the processes of primary oxidation, secondary oxidation and oxidation liquid modulation, wherein the primary oxidation comprises the steps of acidizing the lignite wax for 1 hour and then stirring and oxidizing for 4-6 hours; the secondary oxidation comprises the steps of acidizing the primary oxidation liquid for 20-40 minutes and then stirring and oxidizing for 2-3 hours; the method further comprises the steps of adding the primary oxidation liquid and the secondary oxidation liquid into a reaction kettle, determining the adding amount of an oxidizing agent and a reducing agent, adding the oxidizing agent and the reducing agent into the reaction kettle sequentially and slowly, strictly controlling the reaction temperature at 105-115 DEG C, stirring and oxidizing for 1-2 hours, standing, ageing, spray-drying and forming to obtain the basic chromium sulfate-chrome tanning agent. Compared with the pure sugar reducing agent, the neutral salt content of the basic chromium sulfate-chrome tanning agent is reduced by above 30 percent, the chrome absorption quantity of leather is enhanced, and the plumpness and humidity-resistant and heat-resistant stability of the leather are improved. The basic chromium sulfate-chrome tanning agent comprises organic micromolecular acid with a good masking effect, particularly sulfonated phthalic acid, so that the leather is plump and soft, and has elasticity, natural brightness and wax feel.
Owner:南通金庆美术图案设计有限公司

Preparation method of amino resin retanning agent, retanning agent and application of retanning agent

ActiveCN111961173AGood water solubilityThere will be no precipitation of salt crystalsTanning treatmentTextile/flexible product manufacturePolymer scienceEther
The invention discloses a preparation method of an amino resin retanning agent. The preparation method comprises the following steps: firstly, modifying a dialdehyde monomer by using amino-terminatedpolyoxyethylene ether to obtain a dialdehyde modifier, then carrying out nucleophilic addition reaction with an amino monomer to generate a non-ionic amino resin prepolymer, finally adding an etherifying agent to seal free aldehyde groups, and adjusting the pH value to be neutral so that the amino resin retanning agent is obtained, wherein the molar ratio of primary amino in the amino monomer to aldehyde groups in the dialdehyde monomer is 1: 1.3-1: 3, and the proportion of unreacted aldehyde groups in the dialdehyde modifier is 40%-90%. The invention further discloses the retanning agent andan application thereof. According to the amino resin retanning agent provided by the invention, salt reactants are not involved in the whole process, the product quality is good, the comprehensive performance is high, the retanning performance can be comparable with that of a traditional amino resin retanning agent, formaldehyde is not used as a raw material in the preparation process, and the risk of residual formaldehyde brought by the retanning agent in finished leather processing is fundamentally eliminated.
Owner:科凯精细化工(上海)有限公司

Ultrathin metal based transparent conductive film

The invention discloses an ultrathin metal based transparent conductive film. The ultrathin metal based transparent conductive film comprises a bottom dielectric layer, an ultrathin metal layer and atop dielectric layer which are sequentially arranged from bottom to top, wherein the ultrathin metal layer is a silver layer; the bottom dielectric layer and the top dielectric layer both comprise thechemical components of MxZn1-xO; the average surface roughness of the bottom dielectric layer is 0.1-0.3 nm; M is a doped element and is any one of Mg, In and Gd; x is the mass ratio of the doping amount of M to the total quantity of M and Zn, and x is 0.005-0.5. The transparent conductive film is provided with a three-layer structure; compared with existing common transparent conductive films with the same structures, the ultrathin conductive film has the advantages that the high-temperature stability, the hydrothermal stability, the chemical stability, the in-air stability, the scraping resisting stability and other performances are greatly improved on the premise that the average optical transmission rate is not less than 80% under the wavelength of 400-800nm, and the film sheet resistance is not beyond 7 ohms / sq; and the application demands of a plurality of flexible photoelectric appliances can be met.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

Hybrid cross-linked porous membrane of highly bionic bone matrix for skull repair and preparation method thereof

The invention provides a hybrid cross-linked porous membrane of highly bionic bone matrix for skull repair, which is composed of a three-dimensional network of double cross-linked polymer and micron spherical hydroxyapatite uniformly distributed therein. The three-dimensional network of double cross-linked polymer is formed by oxidization and self-crosslinking of polymer materials with carboxyl and catechol functional groups, and Michael addition reaction of the polymer materials with carboxyl and catechol functional groups and the polymer materials with amino and carboxyl, and phenolic hydroxyl groups on the polymer materials with carboxyl and catechol functional groups chelated with calcium ions dissociated from the micron-sized spherical hydroxyapatite. According to the method, the dispersibility of the hydroxyapatite in the material can be improved, the integration degree of hydroxyapatite and an organic phase is increased, remodeling and regeneration of skull defect can be achieved without exogenous cells or growth factors.
Owner:SICHUAN UNIV

Epoxy leather tanning agent and preparation method thereof

The invention discloses an epoxy leather tanning agent and a preparation method thereof. The preparation method comprises the steps that a part of epoxy chloropropane is dropwise added into isophoronediamine at first and reacts at the temperature of 25-35 DEG C for 2-4 h, after polyatomic alcohol and a catalytic agent are sequentially added, the other part of the epoxy chloropropane is dropwise added, after all the epoxy chloropropane is added, the temperature is raised to 50-70 DEG C, reaction is conducted for 3-8 h, an alkali compound is dropwise added when the temperature is lowered to 20-45 DEG C, reaction is conducted for 2-4 h, finally, a neutralizer is added for neutralization till the pH value is neutral, an upper-layer product is rotated and filtered, the epoxy leather tanning agent comprising the following formula is obtained, and the formula can be seen in the specification. The epoxy leather tanning agent is low in production cost, can be stably stored for longer than 6 months at the normal temperature, and is low in viscosity, good in heat stability, wide in molecular weight distribution and short in tanning time, the tanned leather is pure white, full and good in hydrothermal stability and yellowing resistance, and the storage stability is good.
Owner:SICHUAN UNIV

Internal wall thermal insulation building with high thermal resistance and thermal stability

The invention relates to an internal wall thermal insulation building with high thermal resistance and thermal stability. The building comprises a building internal wall and a thermal insulation board, wherein the thermal insulation board is arranged on an internal wall of the building; the thermal insulation board comprises a thermal insulation and heat protection board with high thermal resistance; and the thermal insulation and heat protection board is used for thermally separating a wall with high thermal inertia from indoor air with low thermal inertia. The building has an internal wall thermal insulation structure, namely the thermal insulation and heat protection board is decorated on the internal wall (comprising an inner wall, a ceiling and a ground), so that the wall is separated out thermally, and the thermal inertia of a room is substantially reduced; and the intensity of leakage of heat in the air to the wall is greatly reduced while the temperature, humidity and comfortableness of the indoor air are improved, so that the air in the room is quickly heated, an extremely obvious temperature rising effect is achieved, and the technical problem of low temperature rising effects of the air in the room due to the high thermal inertia of the wall in the prior art is solved.
Owner:浙江鼎美智装股份有限公司

Green silicate fluorescent powder with narrow half peak width and preparation method thereof

The invention discloses green silicate fluorescent powder with a narrow half peak width. The silicate fluorescent powder has a general chemical formula of (M1xBa2-x-u-k)(SiyM21-y)O4:uMn<2+>, kM3<2+>, wherein M1 is at least one of Sr, Ca, Mg and Cu, M2 is at least one of Ti, Zr, Ge and Sn, and M3 is one of Eu, Sm and Yb; x is greater than 0 and less than or equal to 0.2, y is greater than 0.8 and less than 1.0, u is greater than 0.05 and less than or equal to 0.15, and k is greater than 0 and less than or equal to 0.05. The invention also discloses a preparation method comprising: weighing raw materials and a fluxing agent, and performing mixing and grinding to obtain a mixture; performing high-temperature sintering on the mixture in a reducing atmosphere, and performing crushing, screening, alcohol washing and drying on the sintered mixture after cooling to obtain the narrow-half-peak wide-green silicate fluorescent powder. The preparation method of the fluorescent powder provided by the invention is simple and easy to control, needs a low sintering temperature during preparation, has a wide process window, and is suitable for large-scale industrial production; the obtained fluorescent powder has a narrow half peak width and a small particle size, is uniform in distribution, narrow in distribution range, good in chemical stability and strong in resistance to heat and humidity, and can be widely applied to LED illumination or display systems.
Owner:HEBEI LIFU CHEM TECH

High-thermal-conductivity composite PCB substrate and preparation method thereof

The invention discloses a high-thermal-conductivity composite PCB substrate and a preparation method thereof. The preparation method comprises the following steps: step 1, dispersing a fluorine-containing coupling agent and boron nitride into a good solvent to obtain an impregnation liquid, adjusting the impregnation liquid to be acidic, then immersing glass fiber cloth into the impregnation liquid, taking out the glass fiber cloth from the impregnation liquid, carrying out alkali treatment, and drying to obtain boron nitride / glass fiber composite cloth; and step 2, dipping the boron nitride / glass fiber composite cloth in a polytetrafluoroethylene glue solution, drying to obtain a boron nitride / glass fiber / polytetrafluoroethylene prepreg, and carrying out curing treatment on the multilayerboron nitride / glass fiber / polytetrafluoroethylene prepreg to obtain the composite PCB substrate. The method is suitable for large-scale production of the high-thermal-conductivity PCB substrate for high-frequency and high-speed data transmission, and has important practical significance and popularization value in the field of high-frequency and high-speed PCB substrates.
Owner:SHAANXI UNIV OF SCI & TECH

Transition metal ion doped perovskite quantum dot material and preparation method thereof

The invention relates to the technical field of photoelectric materials, in particular to a transition metal ion doped perovskite quantum dot material and a preparation method thereof. The transition metal ion doped perovskite quantum dot material has excellent hygrothermal stability and water stability, still has bright luminescence and retains up to 95% of black phase after being placed in an environment of 85 DEG C and 85% of relative humidity for 100 h, and only retains 51.7% of black phase in 40th min when a sample is not doped, so that the stability after doping is improved by more than 150 times; in addition, after the doped dispensing quantum dot film is soaked in deionized water for 100 hours, the doped dispensing quantum dot film still has excellent luminescence performance; after the doped quantum dot solution and water are mixed and stirred for 200 hours, the bright red light emitting property is still kept, and the high light emitting intensity is still shown after 284 hours.
Owner:BEIHANG UNIV

Multi-aldehyde-group amphoteric polyurethane retanning agent and preparation method thereof

The invention discloses a multi-aldehyde-group amphoteric polyurethane retanning agent and a preparation method thereof. The preparation method comprises the following steps: under the protection of N2, carrying out pre-polymerization reaction on isophorone diisocyanate and polytetrahydrofuran under the action of a catalyst; after raising the temperature, adding chain extenders including 2,2-dimethylol propionic acid, N-methyldiethanolamine and 2,4-dihydroxy benzaldehyde into a system respectively; after reacting for a period of time, cooling and carrying out neutralization and emulsification;finally, obtaining the multi-aldehyde-group amphoteric polyurethane retanning agent. The multi-aldehyde-group amphoteric polyurethane retanning agent provided by the invention contains cation groups,carboxyl and aldehyde groups and can be used for effectively improving the reaction performance with a tanned leather blank and improving the retanning on hydrothermal stability of leather.
Owner:SHAANXI UNIV OF SCI & TECH

One-piece electromagnetic radiation protection clothing for aircrew

The invention discloses an article of one-piece electromagnetic radiation protection clothing for aircrew. The one-piece electromagnetic radiation protection clothing for the aircrew comprises a hat, a jacket and a pair of trousers and is characterized in that the hat, jacket and trousers are connected into one piece, the front fly of the jacket is opened to the crotch of the trousers from the chest of the jacket, sleeve tabs are arranged at the cuffs of the jacket, leg opening tabs are arranged at the trouser legs of the trousers, and a pair of protective gloves and a pair of protective socks are arranged for using with the protection clothing. The one-piece electromagnetic radiation protection clothing for the aircrew has high / low temperature stability, wet-hot stability, sweat corrosion stability and excellent washing resistance. The one-piece electromagnetic radiation protection clothing for the aircrew is capable of resisting bacteria, dust, static electricity and the like, and each suit of protection clothing is less than or equal to 2.0 kilograms in weight, small in volume and flat.
Owner:中国化工集团曙光橡胶工业研究设计院有限公司

A kind of epoxy leather tanning agent and preparation method thereof

The invention discloses an epoxy leather tanning agent and a preparation method thereof. The preparation method comprises the steps that a part of epoxy chloropropane is dropwise added into isophoronediamine at first and reacts at the temperature of 25-35 DEG C for 2-4 h, after polyatomic alcohol and a catalytic agent are sequentially added, the other part of the epoxy chloropropane is dropwise added, after all the epoxy chloropropane is added, the temperature is raised to 50-70 DEG C, reaction is conducted for 3-8 h, an alkali compound is dropwise added when the temperature is lowered to 20-45 DEG C, reaction is conducted for 2-4 h, finally, a neutralizer is added for neutralization till the pH value is neutral, an upper-layer product is rotated and filtered, the epoxy leather tanning agent comprising the following formula is obtained, and the formula can be seen in the specification. The epoxy leather tanning agent is low in production cost, can be stably stored for longer than 6 months at the normal temperature, and is low in viscosity, good in heat stability, wide in molecular weight distribution and short in tanning time, the tanned leather is pure white, full and good in hydrothermal stability and yellowing resistance, and the storage stability is good.
Owner:SICHUAN UNIV

Method for improving collagen heat stability by utilizing hydroxyapatite

The invention relates to a method for improving collagen heat stability by utilizing hydroxyapatite, and belongs to the technical field of tanning. The method comprises the following steps that according to the weight of limed skin, 3-5 parts of hydroxyapatite and 50-80 parts of water at the temperature of 20-30 DEG C are added in 100 parts of softening naked skin rotating drum, the softening naked skin rotating drum rotates for 40-60 minutes and stands for 60 minutes, water is drained, and the obtained naked skin is obtained. According to the method for improving the collagen heat stability by utilizing the hydroxyapatite, a nano-scale hydroxyapatite micro-core precursor is prepared by a hydrothermal method, and the micro-core precursor is permeated into the softened naked skin, so that the naked skin can be shaped to a certain degree. The physical and chemical properties, and especially the humidity resistance and heat stability are improved. The utilization value includes that the loss of the leather is reduced as the protection when the acid leaching temperature is too high; and also the pre-treatment of the hydroxyapatite can be used for degreasing the multi-fat skin at a hightemperature, so that a guarantee is provided for effective degreasing of sheep skin and pig skin before tanning.
Owner:SICHUAN UNIV

Method for preparing CsPbI3 perovskite thin film and high-efficiency solar cell thereof in high-humidity environment and application of CsPbI3 perovskite thin film and high-efficiency solar cell thereof

PendingCN114284439AGood energy conversion efficiencyReduce the harsh environmental requirements of the preparationSolid-state devicesSemiconductor/solid-state device manufacturingMetallic electrodeHole transport layer
The invention relates to a method for preparing a CsPbI3 perovskite thin film and a high-efficiency perovskite solar cell in a high-humidity environment and application, and belongs to the field of optoelectronic materials and devices. According to preparation of the full-inorganic CsPbI3 thin film, a precursor solution with methylamine acetate as a solvent is spin-coated on an FTO conductive substrate with an electron transport layer by adopting a hot spin-coating technology, a compact and uniform perovskite thin film is prepared through gradient annealing, and the whole process is completed in air with the relative humidity of 40%-80%. And then spin-coating an interface modification layer and Spiro-OMeTAD on the thin film as a hole transport layer, and evaporating a MoO3 modification layer and a metal electrode by using a vacuum evaporation technology to complete the preparation of the device. The CsPbI3 all-inorganic perovskite solar cell prepared by the method in high-humidity air has excellent photoelectric conversion efficiency.
Owner:NANJING UNIV OF TECH

Composition for packaging photoelectric device

ActiveCN106883558AImproved crack resistanceImprove heat and humidity resistanceSemiconductor/solid-state device detailsSolid-state devicesChemistryReflow soldering
The invention discloses a composition for packaging a photoelectric device. The composition comprises the following components in percentage by mass: 90 to 100 percent of a mixture of esterified aromatic phenol and epoxy resin, 0.1 to 2 percent of a catalyst, 0.2 to 2 percent of a coupling agent, 0.1 to 0.5 percent of an anti-aging agent, 0.1 to 0.5 percent of a colorant and 10 to 90 percent of a filler, wherein the equivalence ratio of the esterified aromatic phenol and the epoxy resin in the mixture of the esterified aromatic phenol and epoxy resin is 0.8 to 1.2. According to the composition for packaging the photoelectric device, the aromatic phenol resin with an esterified structure is combined with the epoxy resin and the other components, so that a cured material with undamaged heat resistance and light fastness can be formed, and the toughness, damp-heat resistance stability (particularly reliability of reflow soldering, damp-heat and salt-fog resistance), sealing performance and crack resistance of the cured material are relatively high.
Owner:汇涌进光电(浙江)有限公司

A kind of method that carbodiimide catalyzed amino-terminated hyperbranched polymer is used for leather tanning

The invention discloses a method for using carbodiimide catalyzed amino-terminated hyperbranched polymers for leather tanning, and particularly relates to a method which is characterized in that the carbodiimide catalyzed amino-terminated hyperbranched polymers and a raw leather collagen fiber net generate multi-point covalent cross-linking; in the tanning step, the carbodiimide catalyzed amino-terminated hyperbranched polymers and the raw leather collagen fiber net are used for generating multi-point covalent cross-linking, so that the amino-terminated hyperbranched polymers and the raw leather collagen fiber net are used for generating multi-point covalent cross-linking, and thus the damp heat resistance stability and other physical mechanical performance of finished product leather tanned by the amino-terminated hyperbranched polymers can be improved. Under the catalysis of the carbodiimide, the amino-terminated hyperbranched polymers have the capability of singly bearing a tanningagent; a filling agent is re-tanned; the application range of the amino-terminated hyperbranched polymers to leather chemical engineering is expanded. The tanning method provided by the invention usescarbodiimide as the tanning catalyst, and uses the amino-terminated hyperbranched polymers as basic materials; when the method is applied to the leather tanning work section, the finished product leather has the advantages of good damp heat resistance stability, excellent physical mechanical performance, richness, softness and the like are realized.
Owner:SHAANXI UNIV OF SCI & TECH

Surface-functionalized spherical nano silicon dioxide-graphene oxide/polymer-based compound tanning agent and preparation method thereof

The invention discloses a surface-functionalized spheroidal nano SiO2-graphene oxide / polymer-based compound tanning agent and a preparation method of the surface-functionalized spheroidal nano SiO2-graphene oxide / polymer-based compound tanning agent. The prepared novel nano compound tanning agent is good in solubleness in a water phase and is quite beneficial to permeation and absorption of tanning agent molecules. The spherical nano compound tanning agent can more easily permeate in and fill in gaps of leather collagen fibers under the effect of mechanical force of a revolving drum due to small friction resistance. When the tanning agent is used for tanning sheep wet white leather, the thickening rate of the leather can reach 189%, and the leather utilization rate is greatly improved. Theshrinkage temperature of the tanned leather can reach 80 DEG C or above, after compounding of 0.5% chrome tanning, the shrinkage temperature can reach 95 DEG C or above, hydrothermal stability of theleather is remarkably improved, and the requirement for using performance of the finished leather is met. The tanned leather has the certain electrical resistance and fire resistance. The novel nanocompound tanning agent can partially replace chrome tanning, and a novel thought and a novel method are provided for clean chrome-free tanning research.
Owner:HENAN UNIVERSITY

Preparation method of retanning agent, retanning agent and application of retanning agent

The invention discloses a preparation method of a retanning agent. The preparation method comprises the following steps: modifying a dialdehyde monomer to obtain partially sulfonated dialdehyde; thensubjecting the partially sulfonated dialdehyde to a nucleophilic addition reaction with an amino monomer so as to generate an amino resin prepolymer containing a sulfonic acid group; and adding an etherifying agent to seal free aldehyde groups so as to obtain the amino resin retanning agent, wherein a molar ratio of primary amino groups in the amino monomer to the aldehyde groups in a dialdehyde monomer is 1: 1.3 to 1: 3, and the proportion of unreacted aldehyde groups in the partially sulfonated dialdehyde is 40%-90%. The invention further provides the retanning agent and application thereof.According to the preparation method disclosed by the invention, the water solubility and dispersity of the amino resin prepolymer and the retanning agent product are improved, so the retanning agentis good in quality and high in comprehensive performance, and the retanning performance of the retanning agent is comparable with the retanning performance of a traditional amino resin retanning agent.
Owner:科凯精细化工(上海)有限公司
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