39results about How to "High amino content" patented technology

The invention discloses a preparation method of industrial aminated graphene. The preparation method of the industrial aminated graphene belongs to the technical field of graphene preparation, and comprises the steps of firstly stripping graphite through a mechanical stripping method, oxidizing through adjusting the matching ratio of a main oxidizing agent and an auxiliary oxidizing agent, then activating hydroxyl and carboxyl on the surface of graphene oxide through a chlorinating agent, and finally selecting appropriate diamine for carrying out amination reaction. According to the preparation method of the industrial aminated graphene provided by the invention, through adopting a stripping manner at first, the dosage of the oxidizing agents can be reduced, an ideal effect is achieved atthe same time, and the problem of poor modification effect caused by high oxygen content and severe destructiveness on a graphene slice layer due to large dosage of the oxidizing agents is solved.

The invention relates to a method I for preparing an amino-modified attapulgite adsorbent. The method I comprises the following steps: performing the reaction on an amino reagent and a silane coupling agent to obtain solution A; performing the grafting reaction on the surface of preprocessed attapulgite by utilizing the solution A so as to obtain the amino-modified attapulgite adsorbent. The invention further discloses a method II for removing hexavalent chromium from water by utilizing the amino-modified attapulgite adsorbent. The method II comprises the following steps: adding the amino-modified attapulgite adsorbent of which mass is 0.0005 time of a water body to be purified into the water body to be purified; adsorbing hexavalent chromium in the water under the conditions of a temperature of 25 DEG C and pH of 3.0 to 9.9; after adsorbing for 10min to 24h, collecting the amino-modified attapulgite adsorbent and purifying hexavalent chromium in the water body. According to the invention, the amino reagent is adopted to modify the attapulgite so as to synthesize the attapulgite adsorbent with high amino content; the modified attapulgite has stable chemical performance and is not influenced by the outside environmental factors. The method disclosed by the invention is simple to operate, low in cost and high in adsorption property.

The invention discloses a composite photocatalyst, a preparation method and an application thereof. The composite photocatalyst comprises hollow glass beads, and graphene and TiO2 supported on the surface of the hollow glass beads. The method comprises the following steps: firstly pretreating the hollow glass beads, and loading the surface of the pretreated hollow glass beads with a graphene oxidelayer to form a graphene oxide/hollow glass bead composite material; placing the bead composite material into a TiO2 precursor, and reacting at appropriate pressure, at appropriate stirring speed andat 100-200 DEG C for 4-12 h so as to obtain the composite photocatalyst. In comparison with traditional TiO2 loaded hollow glass beads, the composite photocatalyst has good response to visible light,higher utilization rate of sunlight, and has a better effect of catalyzing pollutants. The composite photocatalyst of the invention has the characteristics of easy recovery and good dispersity. The composite photocatalyst has a regular spherical shape and good fluidity such that the composite photocatalyst is extremely easy to disperse in a matrix during application.

The invention discloses a starch-modified heavy metal trapping agent and a preparing method thereof. The preparing method comprises the steps that firstly, starch is taken and subjected to a cross-linking reaction with a cross-linking agent under the action of a catalyst, and cross-linked starch is obtained; secondly, the cross-linked starch and an etherifying agent are subjected to an etherification reaction under the action of an initiator, and cross-linked etherified starch is obtained; thirdly, in an alkaline environment of a sodium carbonate aqueous solution, the cross-linked etherified starch and an aminating agent are subjected to an amination reaction, and the obtained cross-linked amino starch is the starch-modified heavy metal trapping agent, wherein the content of amino in the modified starch is 1.2-1.8%. Compared with the prior art, the sodium carbonate aqueous solution is used for providing the alkaline environment in the amination reaction, the content of amino of the modified starch can be increased through the preparing method, the starch-modified heavy metal trapping agent has the advantage of being high in copper removing rate, and a chelate formed by the starch-modified heavy metal trapping agent and heavy metal ions is insoluble in water, and can be easily separated from a solution.

The invention belongs to the field of silicon dioxide modified with organic functional molecules, relates to silicon dioxide nanoparticles grafted with organic functional molecules as well as a preparation method and application thereof, and particularly relates to silicon dioxide nanoparticles grafted with a hindered phenol antioxidant with carboxyl and a preparation method thereof. The silicon dioxide nanoparticles grafted with organic functional molecules are obtained by grafting organic functional molecules such as the hindered phenol antioxidant to the surfaces of silicon dioxide nanoparticles through chemical bonds; the migration and volatilization of the organic functional molecules such as the hindered phenol antioxidant can be reduced, and the extraction resistance of the antioxidant is improved, so that the long-term ageing resistance of the antioxidant is improved. After the nanoparticles are grafted and modified by organic functional molecules such as hindered phenol antioxidants, the compatibility and dispersity of the nanoparticles in a polymer matrix can be effectively improved, and the comprehensive mechanical properties of the polymer material are improved.

The invention discloses a preparation method of composite silicon dioxide aerogel capable of adsorbing formaldehyde and belongs to the field of aerogel application. The existing porous adsorption material similar to activated carbon has no specificity for adsorption of formaldehyde and has poor stability, thereby being easy to cause automatic desorption and re-release of formaldehyde after adsorption. Therefore, the invention adopts a sol-gel method which is characterized in that under the condition of room temperature, chitosan serving as a raw material is subjected to nano-scale combinationwith silicon dioxide; in the reaction process, the opening of a conical flask is tightly sealed by a sealing membrane to obtain a sealed reaction condition, thereby being favorable for reacting; and further, acidification and amination modification are performed. The obtained modified gel has higher amino content, contains active groups such as alkyl, hydroxyl and amino of chitosan, and has greatly enhanced specificity for adsorption of formaldehyde. Furthermore, the adsorption material is environment-friendly, can not cause secondary pollution, has good stability, and has no phenomena of automatic desorption and re-release of formaldehyde.

The invention discloses polyether polyamine which is characterized by having a following general formula: H2NC3H6(OC3H6)a(OC2H4)b(OC3H6)aNHCH2CH(OH)CH2(OC2H4)cOCH2CH(OH)CH2NHC3H6(OC3H6)dNH2, wherein the a, b, c and d are all integers from 2-40. The polyether polyamine provided by the invention contains amino groups at chain ends, has amino groups in the chain middle part, and has the improved content of the amino groups in comparison with that of the amino groups of the conventional polyether polyamine, and the flexibility of polyether polyamine block silicone oil prepared by using the polyether polyamine as one of raw materials is greatly improved.

The invention discloses a preparation method of graphene. The preparation method of the graphene comprises the following steps: 1, stripping graphite by a supercritical carbon dioxide stripping method, dispersing the obtained graphite powder into deionized water, crushing by a homogenizer, controlling the pressure to 90 to 150 MPa, and sequentially dispersing and drying; and 2, soaking and washingthe dry product in the step 1 with diluted hydrochloric acid, wherein the soaking temperature is -10 to 15 DEG C, the soaking time is 1 to 4 hours, and the mass ratio of the diluted hydrochloric acidto the graphite is (1-2.5):1, adding a compound of potassium dichromate and hydroperoxide, performing oxidation reaction at the reaction temperature of 10 to 85 DEG C for 2.5 to 6 hours, and sequentially performing water washing, suction filtration and drying after reaction to obtain graphene oxide powder. An aminated graphene sheet obtained by the preparation method of the graphene has small diameter and small layer number, is favorable for being dispersed in a base material when a macromolecular material is modified, avoids aggregation and can achieve a good modification effect under the condition of small adding amount.

The invention discloses a zinc-rich anticorrosion coating. The zinc-rich anticorrosion coating is mainly prepared from a mixture of a component A and a component B in a mass ratio being (3.5-6):1, wherein the component A comprises the following raw materials in parts by mass: 100 parts of inorganic nano-zinc powder, 45-75 parts of bisphenol S epoxy resin, 20-35 parts of fumed silica, 10-25 parts of phenolic epoxy resin, 15-20 parts of hydrogenated bisphenol A epoxy resin, 5-10 parts of tetrabromobisphenol A resin, 6-15 parts of diglycidyl ortho-phthalate and 0.5-1.5 parts of a leveling agent;the component B comprises the following raw materials in parts by mass: 50-65 parts of aminohydrocarbyl silicone oil, 15-25 parts of polyaniline, 5-10 parts of graphene nanoplatelets, 5-8 parts of boron-containing polysilane, 1-3 parts of a defoaming agent and 3-5 parts of a wetting and dispersing agent. The coating has the following beneficial effects: (1) electrical conductivity of polymers in the coating is enhanced; (2) corrosion resistance is excellent; (3) physical properties of the coating are good.

The invention belongs to the biotechnology field, and particularly discloses a rice bran vegetable protein formaldehyde remover. According to the rice bran vegetable protein formaldehyde remover, ammonium hydroxide-bromelain can be adopted for hydrolyzing rice bran proteins to obtain rice bran vegetable protein liquid, and the rice bran vegetable protein liquid is used as a formaldehyde removing active ingredient to prepare the novel rice bran vegetable protein formaldehyde remover. The prepared novel formaldehyde remover is stable in physicochemical property, environment-friendly, free of pollution, good in water solubility, convenient to use and high in formaldehyde removing rate.

The invention relates to a preparation method of chitosan oligosaccharide grafted cellulose fiber. The preparation method comprises following steps: A, preparation of sodium methallyl sulfonate-chitosan, wherein chitosan oligosaccharide is added into hot water to prepare a chitosan oligosaccharide aqueous solution, the chitosan oligosaccharide aqueous solution is cooled to room temperature, sodiummethallyl sulfonate is added into the chitosan oligosaccharide aqueous solution, an obtained mixture is subjected to stirring and heating, and potassium persulfate is added so as to obtain the sodiummethallyl sulfonate-chitosan oligosaccharide solution; B, cellulose fiber pretreatment, wherein cellulose fiber and soft water are introduced into a pretreatment tank, heating, stirring, water discharging, dehydration, and drying are carried out so as to obtain pretreated cellulose fiber; and C, preparation of chitosan oligosaccharide grafted cellulose fiber, wherein the cellulose fiber obtainedin step B is introduced into a reaction vessel, the sodium methallyl sulfonate-chitosan oligosaccharide solution obtained in step A is added, water is added, and stirring, heating, and centrifugal dewatering are carried out so as to obtain the chitosan oligosaccharide grafted cellulose fiber.

The invention provides aldehyde adsorption resin and a preparation method and application thereof. Amino groups of the resin are rich in amino and hydrazino polar groups, the content of the amino groups is 10-20 times that of common modified macroporous resin, the amino groups and the hydrazino groups play a synergistic effect, a better removal effect on aldehydes is achieved, acid/alkali regeneration is easy, and the performance is stable. After the wastewater passes through the azeotropic tower and the stripping tower and is adsorbed by resin, an aqueous solution of which the COD is less than 1000mg/L and the total aldehyde is less than 500mg/L is obtained and can be subjected to biochemical treatment. According to the method, the wastewater treatment cost is effectively reduced, or organic matters in the wastewater are recycled, the waste gas emission is reduced, and economic and environment-friendly values are realized.