48results about How to "Avoid over-crosslinking" patented technology

The invention belongs to the fields of material science and biomedical application, and in particular relates to an MRI and PTT diagnosis and treatment integration functional microsphere with a core-shell structure and a preparation method thereof. The functional microsphere comprises a polypyrrole nano particle core and a polydopamine shell coated on the outer surface of the core, Fe3+ particles are arranged on the polydopamine shell in a complexing manner, the weight ratio of polypyrrole nano particles to polydopamine is 1: (3.1-10.2), and the weight ratio of the Fe3+ particles to the polydopamine is 1: (9.3-11.2). The preparation method comprises the following three steps: S1, preparation of the polypyrrole nano particles; S2, preparation of the nano microsphere with the core-shell structure; and S3, preparation of the MRI and PTT diagnosis and treatment integration functional microsphere. The functional microsphere is prepared by using the nontoxic polypyrrole and polydopamine with excellent biocompatibility, and is high in stability in blood of human bodies; moreover, the functional microsphere has T1 radiography effect and optothermal effect, can be used for magnetic resonance imaging (MRI) and photothermal therapy (PTT), and is a diagnosis and treatment integration functional material with great potential value.

The invention relates to a polyethylene foam material prepared by utilizing a recycled foam material. The polyethylene foam material sequentially comprises the following components in parts by weight: cross-linked polyethylene foam material waste, composite filling agent, compound cross-linking agent, compound foaming agent and foaming auxiliary agent and is sequentially processed and produced through the cross-linked polyethylene foam material waste, the composite filling agent, the compound cross-linking agent, the compound foaming agent and the foaming auxiliary agent. The polyethylene foam material with excellent property disclosed by the invention is produced by sequentially carrying out cross-linked polyethylene foam material waste processing, raw material mixing, raw material retreatment, slice cutting, compression moulding and cooling shaping on the cross-linked polyethylene foam material waste, the composite filling agent, the compound cross-linking agent, the compound foaming agent and the foaming auxiliary agent which are in certain parts by weight, thereby reducing the production cost, protecting the environment and recycling the resources.

The invention relates to a preparation method for liquid polyborosilazane and belongs to the field of inorganic nonmetallic materials. The preparation method comprises the following steps: liquid polyborosilazane and 9-borabicyclo [3,3,1]-nonane are added in a solvent in inert atmosphere to obtain mixed solution, then the obtained mixed solution is hydroborated under the stirring condition, and then the solvent is removed after completion of hydroboration to obtain the liquid polyborosilazane. The preparation method solves the problems in the traditional polymer route that excessive cross-linking is easily caused in the hydroboration addition reaction, and solid polyborosilazane has poorer fluidity. The prepared liquid polyborosilazane has good fluidity and high ceramic yield and can be directly used for the high polymer infiltration and pyrolysis method for preparing SiBCN ceramic matrix composites.

The invention discloses fluorosilicone resin and a preparation method thereof. The method comprises the following steps: pentafluorostyrene is used as a raw material, and pentafluorophenethyldimethylchlorosilane is obtained by a hydrosilylation reaction; and the pentafluorophenethyldimethylchlorosilane, trimethylchlorosilane and ethyl orthosilicate are subjected to a polycondensation reaction to prepare the pentafluorophenyl silicon resin. When the resin disclosed by the invention is prepared, a secondary polycondensation process is adopted, so that the defect of a larger difference of hydrolysis reactivity of the pentafluorophenethyldimethylchlorosilane and copolymerized trialkylmonochlorosilane is overcome, and a preparation yield is high; the obtained pentafluorophenyl silicone resin has superior heat resistance; the method has the advantages of a simple preparation process, low requirements on equipment and raw materials easy to obtain, and is suitable for industrialized enlarged production; and the heat-resistant fluorosilicone resin can be applied to high-molecular materials such as heat-resistant adhesives.

The invention relates to a high-boron content silicon-boron-carbon-nitrogen precursor and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing functional, bifunctional and trifunctional chlorosilane containing unsaturated groups and hexamethyl-disilazane at a low temperature according to a certain ratio, raising the temperature and completely reacting, dropping 1,3-diethyl cycloborazane under low temperature conditions according to a certain ratio, fully reacting the reactants, and finally performing reduced pressure distillation to obtain the solvent and by-products produced by the reaction, thereby obtaining faint yellow viscous liquid or a solid product, namely the SiBCN ceramic precursor. According to the synthetic method disclosed by theinvention, a novel Polyborosilicate resin is prepared by adopting a 'double boron source', the boron content of the prepared SiBCN ceramic can reach 20%, and the problems that the boron content is low and improvement of high temperature resistance and oxidation resistance of the ceramic is not obvious can be solved. The elementary composition regulation range of the precursor disclosed by the invention is wide, and resins which are suitable to serve as a high-temperature-resistant coating, a fiber reinforcement or a ceramic-based composite material matrix and have different elementary compositions can be prepared.

The invention discloses a high-adhesion wear-resistant antifouling paint which is prepared from the following raw materials in parts by weight: 32-35 parts of dicyclopentadiene phenol epoxy resin, 25-28 parts of terpene resin, 10-13 parts of phenol formaldehyde resin, 17-20 parts of iron-titanium dioxide composite modified polystyrene microsphere, 10-13 parts of light calcium carbonate, 4-8 parts of nano attapulgite, 1-3 parts of mica powder, 0.8-1.2 parts of silane coupling agent KH-550, 1.2-1.5 parts of curing agent, 0.6-0.9 part of defoaming agent, 1.5-1.8 parts of leveling agent, 1.2-1.5 parts of pigment and 50-53 parts of solvent.

The invention relates to the technical field of dynamically vulcanized thermoplastic elastomers, and discloses a high-resilience polyurethane/organic silicon thermoplastic elastomer and a preparation method thereof.The preparation method comprises the steps that blending thermoplastic polyurethane, vinyl silicone rubber, a compatilizer and reinforcing filler, placing a product in an internal mixer to be premixed, adding a cross-linking agent, uniform mixing continuesly to obtain rubber and plastic blend; adding the rubber and plastic blend into a twin-screw extruder, adding a prepolymerization catalyst, and carrying out prevulcanization and shear dispersion treatment; when a pre-vulcanized cross-linked product passes through the screw middle section of the double-screw extruder, adding a dynamic vulcanization catalyst, and carrying out shearing dispersion treatment to obtain the polyurethane/organic silicon thermoplastic elastomer; wherein the prepolymerization catalyst and the dynamic vulcanization catalyst are both rubber compounds formed by mixing a catalyst and vinyl silicone rubber. The catalyst is added in batches, so that the silicon rubber can be dispersed in the polyurethane, and the vulcanization rate can be reduced; by adopting the catalyst masterbatch, the uniform particle size of the silicon rubber can be ensured, so that the prepared TPSiV is silky in hand feeling.

The invention discloses biomass material-based recycled asphalt which comprises, by weight, 30-40 parts of waste asphalt, 10-20 parts of new asphalt, 10-20 parts of wood tar oil, 3-6 parts of biopolymer fibers, 3-5 parts of plasticizers, 0.5-1.5 parts of stabilizers and 0.2-0.5 part of compatibilizers. The invention further discloses a preparation method of the biomass material-based recycled asphalt and preparation method. The method includes the steps: preparing a recycled asphalt prototype sample; preparing recycled asphalt. The biomass material-based recycled asphalt can effectively restore pavement performances of waste asphalt, antioxidant aging and low-temperature anti-cracking performances of the waste asphalt are remarkably improved, and a preparation process is simple, easy to operate and low in preparation cost.

The invention relates to a degradable sludge-based seedling pot and a preparation method thereof. The seedling pot is prepared from, by weight, 2-5 parts of polyvinyl alcohol, 80-100 parts of water, 5-10 parts of gelatin, 5-10 parts of dextrin, 5-20 parts of sludge and 0.5-1 part of cross-linking agent. In the preparation process of the seedling pot, the forming treatment is conducted before the cross-linking treatment. The seedling pot has high mechanical properties and can meet the requirements of use performance of the seedling pot in seedling cultivation; the seedling pot can also be rapidly degraded in soil, so that the rapid growth and extension of plant roots after transplanting or planting are not limited, which has a positive effect in improvement of the survival rate of seedlingsand the growth rate of plants.

The invention relates to a co-crosslinking immobilization method of beta-galactosidase. Oil-soluble diethylene glycol diacrylate is used as a cross-linking agent, a reactant in an aqueous phase is a molecule compound prepared from amino containing beta-galactosidase, aminated epoxy resin and beta-cyclodextrin, through a Michael addition reaction of dual bonds and amino, the co-crosslinking polyreaction is generated at low temperature, and the immobilization beta-galactosidase of different loading quantities can be prepared. The cross-linking degree is controlled, so that the dispersibility isimproved, and internal mass transfer microenvironment can be improved. An immobilized enzyme has high catalytic activity, and when the loading quantity is 56mg of enzymes/1g of carriers, the relativeactivity can achieve the highest value, and is 93% of that of free enzymes.

The invention discloses a non-greasy hand cream and a preparation method thereof. The non-greasy hand cream is prepared from the following components by weight: 20 to 30 parts of grape seed oil, 30 to50 parts of mint essential oil, 20 to 40 parts of geranium essential oil, 10 to 20 parts of arnica extract, 10 to 30 parts of organic beeswax, 15 to 20 parts of urea, 10 to 30 parts of vitamin E, 10to 20 parts of xylitol, 5 to 10 parts of ethylparaben and 10 to 30 parts of deionized water. The non-greasy hand cream has dual effects on the hand; i.e., on the one hand, the cream can promote appropriate cross-linking of collagen, and on the other hand, the cream, functioning as an effective free radical scavenger, can prevent excess cross-linking of skin, so wrinkles and vesicae on the skin areprevented and the skin is allowed to maintain soft, moist and smooth. Meanwhile, the cream is soft, mild, moist, non-greasy and non-sticking. Moreover, the cream is good in stability and suitable forstorage and can be used for a long time.

The invention relates to a method for modifying the polarity of elastomer resin, which is characterized in that: the elastomer resin is subjected to melt grafting modification by using sorbic acid as a grafting agent on the premise that an initiator is not added. The method comprises the following steps of: putting the elastomer resin and the sorbic acid (2,4-hexadienoic acid) into processing equipment at one time, and uniformly mixing at the temperature of between 20 and 80 DEG C to obtain composite glue; and feeding the composite glue into reaction equipment, making the composite glue become a melt at the temperature of between 135 and 200 DEG C, maintaining reaction of various components in the melt for 5 to 60 minutes, discharging, and cooling to obtain the elastomer resin subjected to polarity grafting modification. The method effectively solves the problem that the elastomer resin is over-crosslinked easily by the conventional modification technology, and the obtained polarity grafting modification product has thermoplasticity and a bright application prospect in the field of thermoplastic elastomers.

The invention relates to a co-crosslinking immobilization method of tannase. Oil-soluble trimethylolpropane triacrylate is used as a crosslinking agent, reactants in a water phase are the tannase containing amino and a supramolecular complex formed by aminated epoxy resin and beta-cyclodextrin, through a Michael addition reaction of double bonds and the amino, a co-crosslinking polymerization reaction occurs at the low temperature, and immobilized tannase with different loading capacities is prepared. By controlling the cross-linking degree, dispersity is improved, the mass transfer microenvironment inside the tannase is improved, the immobilized tannase has high catalytic activity and has the highest activity when the loading capacity is 89 mg of an enzyme per gram of a carrier, and the activity reaches 92% of a free enzyme.

The invention provides an aliphatic efficient water reducing agent modified with 2-naphthol waste fluid and a preparation method of the aliphatic efficient water reducing agent, and relates to the technical field of waste fluid treatment. The aliphatic efficient water reducing agent is prepared from, by weight, 35-90 parts of 2-naphthol waste fluid, 60-80 parts of ketone compound, 260-380 parts ofaldehyde compound, 80-180 parts of sodium sulfite, 5-15 parts of initiator, 3-12 parts of cellulose xanthate, 1-10 parts of sodium p-styrenesulfonate, 30-90 parts of calcium chloride and 110-160 parts of water; in the preparation process, cellulose xanthate and sodium p-styrenesulfonate are mixed to obtain a solution A, sodium sulfite, the initiator, the ketone compound, the aldehyde compound, the solution A and calcium chloride are added in the 2-naphthol waste fluid in sequence, all reaction temperatures are controlled, and the water reducing agent is obtained. The prepared modified water reducing agent can obviously reduce collapsbillity loss; compared with frequently-used aliphatic water reducing agent, better collapse resistance and freezing resistance are achieved.

The invention relates to a preparation method of tilapia skin collagen beautifying skin-care emulsion, and belongs to the technical field of emulsion preparation, and the method comprises preparation of tilapia skin collagen, preparation of an aqueous phase material liquid, preparation of an oil phase liquid material liquid and emulsification. The tilapia skin collagen beautifying skin-care emulsion prepared by the method has no chemical addition, has excellent moisturizing and whitening functions, can make the skin smooth and bright by long-term use, and is suitable for people susceptible to allergies.

The present invention relates to a natural nutrient preparation, in particular, it relates to a tea pollen composition with the effect of whitening skin, nourishing face, resisting radiation and improving subhealth and its preparation method and application. Said tea pollen contains natural organic acids such as catechinic acid and epicatechin, etc. so that it can promote absorption of OPC and possess obvious synergistic antioxidation action.

The invention relates to a method for preparing an stichopus japonicus collagen emulsion and belongs to the technical field of emulsion preparation. The method comprises the procedures of preparing stichopus japonicus collagen, preparing an aqueous-phase feed solution, preparing an oil-phase feed solution and carrying out emulsification. The stichopus japonicus collagen emulsion prepared by the method is free of chemical addition, has excellent moisture-preserving, whitening and skin care effects, can be used for smoothing and brightening skin in long-term usage and is applicable to allergic people.

The invention relates to a preparation method of a ginseng beautifying and skin caring lotion, which belongs to the technical field of emulsion preparation. The method comprises the following steps: preparation of a ginseng aqueous extract, preparation of aqueous phase liquid, preparation of oil phase liquid and emulsification, the ginseng beautifying and skin caring lotion prepared by the method has no chemical addition, and has excellent cosmetic and skin care functions, long term usage can make skin smooth and bright, and the lotion is suitable for allergic people.