2000results about How to "Increase the degree of cross-linking" patented technology

This invention discloses a method for preparing modified aqueous polyurethane adhesive. The method comprises: (1) modifying epoxy resin with modifier to obtain modified epoxy resin; (2) reacting polyisocyanate with polyester or polyol polyether, and adding chain extender to obtain polyurethane with prepolymer; (3) modifying polyurethane prepolymer with modified epoxy resin to obtain modified polyurethane prepolymer; (4) adding water, dispersing by a high-speed disperser, and adding neutralizer and crosslinking agent to obtain modified aqueous polyurethane adhesive. This invention introduces epoxy resin into the modification of aqueous polyurethane adhesive, thus combines high modulus, high strength and good chemical resistance of epoxy resin with the advantages of polyurethane resin. The modified aqueous polyurethane adhesive can meet the needs of automobile inner decoration materials. The method has such advantages as simple process, and low cost.

A hard coat film of the present invention comprises a hard coat layer, which is a cured coat layer, provided on at least one side of a transparent plastic film substrate, wherein a hard coat layer forming material comprises urethane acrylate (A); isocyanuric acid acrylate (B) and inorganic ultrafine particles (C), and has a high hardness and suppresses curling due to cracking and cure shrinkage.

The invention discloses a polyurethane high-temperature-resistant anti-rutting modifier for road asphalt. The modifier comprises the following components in parts by the total weight of the modifier: 25-65 parts of one or two or more of diisocyanate, polyaryl polymethylene isocyanate and diisocyanate derivatives, 15-60 parts of one or two or more of polymer polyol and polymer polyamine, 2-15 parts of one or two or more of micromolecular polyol chain extender, micromolecular polyamine chain extender and micromolecular polyatomic acid chain extender, 0.01-3 parts of organic polyurethane catalyst, and 0-45 parts of poly-alkadiene polymer compound with a number-average molecular weight of 500-50000. The modifier can greatly improve the high-temperature resistance and anti-rutting properties of matrix asphalt and modified asphalt; and prepared modified asphalt is balanced in high and low-temperature performances, good in compatibility with matrix asphalt, and stored stably.

The invention relates to a galvanized steel sheet excellent in surface abrasion resistance, corrosion resistance and acid and base resistance and a water-based surface treating agent. The surface of a galvanized steel sheet is coated with the surface treating agent in a solidified mode, wherein the surface treating agent includes water-based positive ion polyurethane composite resin, compound organic silane coupling agents containing bis-organic silane coupling agents and mono-organic silane coupling agents, compound lubrication particles containing teflon-surface modification high-density polyethylene particles, oxidized graphene, water-soluble fluorine-containing compounds, water-soluble phosphorous compounds, water-soluble rare earth salt compounds and other components, and therefore the surface treatment galvanized steel sheet excellent in surface abrasion resistance, corrosion resistance and acid and base resistance is obtained. Meanwhile, the surface treatment galvanized steel sheet has good resistance, such as solvent resistance, to all kinds of chemical media.

The invention relates to a preparation method of thermosetting polyimide film with high modulus and low coefficient of thermal expansion, which obtains an objective product by copolymerization, sol-gel process and condensation. Rigid diamine and dianhydride are adopted in the polyreaction. A sol-gel in situ method is adopted, the reaction process is easy to be controlled, the uniformity is good; the amount of hybridization of inorganic particles can be increased; and the obtained solution is heated step by step to generate condensation reaction. The preparation technique is simple and is easy to be controlled; and the obtained product has higher elastic modulus and low coefficient of thermal expansion; therefore, the invention has higher application value in industry.

The invention relates to the technical field of self repair materials and provides an epoxy microcapsule with polyurea as a wall material. The core material of the microcapsule comprises liquid epoxy resin, the wall material of the microcapsule is crosslinked polyurea prepared by carrying out an interface reaction on polyisocyanate and water, and the polyisocyanate comprises polyisocyanate containing three elements or more than three elements. The invention also provides a preparation method of the epoxy microcapsule with polyurea as the wall material. The preparation method of the epoxy microcapsule with polyurea as the wall material comprises the following steps of: dispersing polyisocyanate and liquid epoxy resin into water containing a surface active agent to obtain a mixed solution, stirring the mixed solution for 0.5-5 hours at the temperature of 25-90 DEG C, filtering, washing, and drying, so that the epoxy microcapsule with polyurea as the wall material is obtained. The preparation method of the epoxy microcapsule with polyurea as the wall material is simple and practicable and is applicable to industrial production.

The invention provides a silane cross-linked polyethylene insulating material composition, which comprises a material A and a material B, wherein the material A is composed of the following components in parts by weight: 100 parts of polyethylene, 0.01-1 parts of initiator, 0.2-5 parts of silane cross-linking agent, and 0.1-0.5 parts of antioxidant; the material B is composed of the following components in parts by weight: 100 parts of polyethylene, 0.5-5 parts of catalyst, 0.01-5 parts of processing aid, and 0.1-0.5 parts of antioxidant; and the material A is mixed and extruded by a reciprocating single-screw extruder.

The invention discloses an injectable bone repair hydrogel and preparation method thereof. The hydrogel is prepared according to the following steps: carrying poly-dopamine (PDA) modified calcium phosphate particles on degradable natural polymers with aldehyde group in an immobilized way, and then mixing the degradable natural polymers with amino group and the degradable natural polymers carrying the PDA modified calcium phosphate particles in an immobilized way and having an aldehyde group to generate Schiff base reaction. The hydrogel disclosed by the invention is formed by the Schiff base reaction of natural polymers in physiological conditions, does not release heat violently, cannot cause damage of peripheral tissues in clinical application, and is applicable to clinical born repair materials.

The invention relates to a preparation method of hydrogel and aims at providing a preparation method of novel double-network hydrogel with high water absorption and high strength. The preparation method comprises the following steps: firstly, a first network monomer, a cross-linking agent, a dispersion medium and an initiator are dissolved in water, and a solution is poured into a silica gel sheet mould, irradiated under strong ultraviolet radiation, stood and cooled; gel is taken out of the mould, put into a water solution containing a second network monomer, a cross-linking agent and an initiator, swollen until balancing, and then taken out to carry out weak ultraviolet radiation so as to obtain the double-network hydrogel with high water absorption and high strength. The invention has simple preparation process and can quickly obtain the double-network hydrogel with superior performance and high water absorptivity. The hydrogel has very good water absorbing capacity and superior mechanical property and can bear external force well. The hydrogel can be widely applied to the field of biomedicine comprising medicine wrapping, medicine slow-controlled release, artificial eye cornea, burn protective films and articular cartilage restoration and replacement and also has potential application value in the field of the light industry.

The invention discloses gelatin hydrogel, which is of a water molecule filled porous three-network structure, wherein the first network is a cross-linked network between the modified gelatin; the second network is a cross-linked network between polyethylene glycol diacrylate; the third network is a cross-linked network between the modified gelatin and the polyethylene glycol diacrylate. The invention also discloses a preparation method of the gelatin hydrogel. By using an ultraviolet light catalytic crosslinking technology, the modified gelatin is cross-linked with the polyethylene glycol diacrylate; the gelatin hydrogel is obtained through preparation. The gelatin hydrogel provided by the invention has the advantages that the elasticity modulus and the degrading performance of the support frame can be regulated and controlled through changing the modification degree of the modified gelatin and the addition quantity of the polyethylene glycol diacrylate; the structure regulation can be better performed according to the requirements of different tissue engineering support frames; the proper space and the intensity can be provided for the growth of the cells; the ordered space structure is formed.

The invention discloses nano-silica/polyacrylate organic and inorganic hybrid water-dispersible resin and a preparation method thereof. According to the method, a silane coupling agent is adopted to modify a methyl methacrylate dispersion liquid of silica at first, and then in-situ polymerization of the modified methyl methacrylate dispersion liquid of silica and acrylate monomers is carried out in a solvent. The nano-silica/polyacrylate organic and inorganic hybrid water-dispersible resin comprises the following ingredients in parts by mass: 20-40 parts of a solvent, 10-40 parts of a modified methyl methacrylate dispersion liquid of silica, 8-14 parts of acrylate monomers, 2-6 parts of acrylic acid, 0.15-0.5 part of an initiator, 1.5-5.5 parts of a pH regulator and 10-30 parts of deionized water. The water-dispersible resin is a pale yellow or pale yellow and slightly-blue semitransparent liquid, is favorable in storage stability, high in coating transparency and good in stain resistance and water resistance, the hardness can be 4H or above and the adhesion can be 1 grade.

The invention discloses a polysulfonamide nanofiltration or reverse-osmosis composite membrane, and a preparation method thereof. the preparation method for the polysulfonamide nanofiltration or reverse-osmosis composite membrane comprises the following steps: pretreatment of a porous supporting membrane; alternate layer-upon-layer assembling of a sulfonyl chloride organic-phase solution and a polyamine water-phase solution on the surface of the porous supporting membrane via reaction; heat treatment; etc.; wherein heat treatment can be carried out during or after layer-upon-layer assembling. Nanoparticles, a surfactant, a catalytic acid absorbent or catalyst, a pore forming agent and other additives are added into the sulfonyl chloride organic-phase solution and the polyamine water-phase solution. The polysulfonamide nanofiltration or reverse-osmosis composite membrane prepared by using the method has improved desalination performance and acid resistance, smoother surface and lower roughness compared with composite membranes prepared through traditional interfacial polymerization, and has good application prospects in the fields of nanofiltration and reverse osmosis.

The invention relates to a method for enhancing hydrophilic stability of a macromolecular film by using metal ions to complex with polyphenol. The method comprises the following steps of firstly, soaking the macromolecular film or an organic surface into an alcohol solvent or water, or cleaning; fetching out, and soaking by a mixed solution containing a crosslinking agent and hydrophilic moleculesfor the second time; fetching out, soaking into a mixed solution containing a polyphenol compound and a mixed solution containing metal ions, and modifying the surface for the third time and the fourth time; finally, fetching out, cleaning and drying. The method has the advantages that the conditions are mild, the operation is simple and convenient, the cost is lower, and the like; the hydrophilic property, anti-oil dirt property and hydrophilic stability of the obtained modified macromolecular film or the inorganic surface are obviously enhanced, the application range of the raw materials isgreatly broadened, and the popularization and application prospect is better.

The invention relates to a microencapsulation method for preparing a hydrotropic substance serving as a core material by using a complex coacervation method. The method is simple in process and low in cost, and the product has high encapsulation rate. The method comprises the following steps of: (1) weighing specific protein and polysaccharide in a certain ratio, stirring and dissolving in hot water to form a wall material solution; (2) weighing a certain mass of hydrotropic core material substance, adding an oil phase substance and an emulsifier in a certain mass ratio, and performing high-speed dispersion to form water/oil (W/O) emulsion; (3) directly pouring the emulsion into the wall material solution, stirring at the constant temperature of 45 DEG C, regulating pH by using 10 percent acid, and reacting for 15 minutes; (4) cooling to the temperature of below 15 DEG C, regulating the pH to 6.0, and adding glutamine transaminase for solidifying; and (5) filtering to obtain a wet capsule product. A dry microcapsule product can be obtained by freeze drying or spray drying.

The invention relates to a preparation method of a low-temperature curing water-based glass baking paint composed of acrylic resin, amino resin, hydroxyl resin, a pigment or a colorant, a wetting agent, an adhesive agent, an acid catalyst, a film-forming auxiliary agent, a defoaming agent, an anti-scratch flatting agent, a thickening agent, a bactericide, a pH regulator, a cosolvent and water. The prepared low-temperature curing water-based glass baking paint has the advantages of low VOC, no pollution to the environment, no poison and harm to operators, strong coating film adhesive force, good flexibility, high hardness, excellent wear resistance, excellent water resistance, excellent alcohol resistance, excellent salt fog resistance, simple construction, and stable storage; and a prepared paint film has the hardness reaching 2 H or more, has excellent anti-scratch wear-resisting properties, and is widely used for surface protection and decoration of wine bottles, perfume bottles, glass products, lamps, woodware, metals, plastics and other products.

The invention discloses a method for preparing super absorbent resin by the graft copolymerization reaction of carboxymethyl potato starch, acrylamide, acrylic acid and sodium salt thereof, which comprises the following main processes: carrying out neutralization reaction between a sodium hydroxide solution and acrylic acid from which polymerization inhibitor is removed under the cooling of ice-water bath; mixing acrylamide with de-ionized water to obtain an acrylamide solution; mixing the carboxymethyl potato starch with the prepared acrylic acid and the sodium salt solution and the acrylamide solution; adding an evocating agent persulfate and a cross-linking agent N,N'- methylene-bisacrylamide; stirring the mixture under room temperature; heating the mixture by water bath to rise the temperature so as to ensure that the carboxymethyl potato starch, the acrylic acid and the sodium salt thereof and the acrylamide generate graft copolymerization reaction under the protection of nitrogen; keeping the temperature of the reaction; drying and crashing to obtain the super absorbent resin with high potassium content by using carboxymethyl potato starch as the raw material. Compared with the similar products, the water absorption of the super absorbent resin is greatly enhanced; the super absorbent resin contains nitrogen nutrition element, does not need pasting in comparison with theprocess of directly using starch and greatly improves the preparation process. The super absorbent resin has great effect on the water conservation, the desert control, the plant growth promotion andthe like of soil in dry regions.

The invention discloses a preparation method and application of pH-responsive amino sodium lignosulphonate. The preparation method comprises the following steps: dissolving sodium lignosulphonate in water to prepare a sodium lignosulphonate water solution, regulating the pH of the solution to be 10-13, and activating at 50-70 DEG C for 0.5-1.0 hour; adding an amination modifier, dropwise adding an aldehyde reagent, and reacting at 70-90 DEG C for 2-4 hours after the dropwise adding, so as to obtain an amino sodium lignosulphonate water solution; extracting the obtained amino sodium lignosulphonate water solution by virtue of an alcohol reagent, washing residual solids by virtue of petroleum ether after the extraction, and carrying out freeze drying on washed remnants. The amino sodium lignosulphonate prepared by virtue of the preparation method has remarkable pH response characteristic; by regulating the pH of the water solution of the product, the molecular configuration and the aggregation extent of the product can be changed, and a regular nanoparticle structure can be spontaneously formed; the amino sodium lignosulphonate can be used as a wall material to be applied field of pesticide microcapsules and is hopefully applied to the field of lignin-based nanometer materials.

The invention provides a method for preparing a cross-linked hyaluronan sponge, and the sponge obtained by the method. The method comprises the following steps of: (1) swelling a hyaluronan raw material in water to obtain a hyaluronan gel fluid; (2) adjusting the hyaluronan gel fluid to be alkaline, adding a cross-linking agent, and performing cross-linking reaction to obtain a cross-linked hyaluronan gel; and (3) cleaning the cross-linked hyaluronan gel, and freeze-drying at a low temperature to obtain the cross-linked hyaluronan sponge. The cross-linked hyaluronan sponge prepared by the method provided by the invention is low in the content of the cross-linking agent, good in biocompatibility, consistent in in-vivo degradation cycle and tissue healing cycle, and good in blood-stopping and anti-adhesion functions.

The invention relates to the technical field of chemical engineering, and discloses polyurethane-organosilicon modified waterborne alkyd resin and a preparation method and an application thereof. The polyurethane-organosilicon modified waterborne alkyd resin is composed of the following components, by weight: 26-36 parts of vegetable oil, 8-15 parts of polyol, 12-18 parts of polyacid, 0.03-0.05 parts of an alcoholysis catalyst, 25-32 parts of diisocyanate, 0.03-0.09 parts of dibutyltin dilaurate, 1-12 parts of hydroxyl silicone oil, 1-4 parts of 1,4-butanediol, 3-7 parts of 2,2-dimethylol propionic acid, 2-6 parts of a neutralizing agent, and 1.2-1.9 parts of a small-molecular chain extender. The resin provided by the invention is used for preparing a paint film. The prepared paint film has the advantages of easy construction, high gloss, full paint film, good thermal stability, water resistance, low surface energy, and good mechanical performance.

The invention discloses a method for preparing bisphenol A nanometer silicon gel carrier surface molecule print solid phase extraction filling. Firstly, silanizing agent containing double bonds is grafted on the surfaces of nanometer silicon dioxide beads; secondly, template molecules, functional monomers and crosslinking agents are added into toluene solution containing proper grafted nanometer silicon and catalytic amount evocating agent according to a certain proportion and stirred for polyreaction at temperature of 60 to 70 DEG C and for 15 to 24 hours to generate light-yellow powdery polymer; and finally, templates are eluted from the polymer, and the bisphenol A nanometer silicon gel carrier surface molecule print solid phase extraction filling which has high special selectivity to bisphenol A is obtained. Because the invention adopts the tetrabromobisphenol A and biphenyl diphenol which are analogues of target molecule BPA of as templates, the problem of template leakage is solved. The prepared bisphenol A nanometer silicon gel carrier surface molecule print solid phase extraction filling has high special selectivity to bisphenol A, can collect bisphenol A molecules in trace amount of water sample, and has high recovery ratio and good reproducibility.

The invention discloses a preparation method of a rubber and plastic compound modified asphalt with stable heat storage, comprising the following steps: preparing linear low-density polyethylene graft on a double-screw extruder; on an open mill or an internal rubber mixer, preparing accessory ingredients, such as the polyethylene graft, rubber, an accelerator, an activator, a vulcanizing agent and the like into the rubber and plastic compound by warming, wherein the rubber and plastic compound is a thermoplastic elastomer; heating 100 parts of petroleum asphalt to 150-200 DEG C; adding 3-5 parts of prepared rubber and plastic compound; intensely shearing at high speed by a high-speed emulsification dispersion machine dedicated for preparing the polymer modified asphalt; completely meltingand shearing the rubber and plastic compound; and evenly dispersing asphalt to obtain the rubber and plastic compound modified asphalt. The preparation method is easy to prepare the modified asphalt and only needs to charge once. The prepared modified asphalt consumes a small quantity of vulcanizing agent, has good compatibility of the rubber and plastic compound and the asphalt, stable heat storage, good high-temperature stability and good low-temperature crack resistance and can be used for road paving, buildings, waterproof materials and the like.