14results about How to "Uniform crosslinking" patented technology

The invention relates to the field of waterproof sealing materials, and discloses a composite high-weather-resistance rubber waterstop which is composed of an outer layer, a middle layer and an inner layer. The outer layer contains 3%-8% of nano titanium dioxide, 2%-5% of nano zinc oxide, 50%-70% of a rubber matrix and 1%-3% of an ultraviolet light absorber, and the total proportion of the outer layer is 10%-20%. The middle layer is composed of 70%-85% of EPDM, 5%-10% of carbon fiber and 5%-10% of plasticizer, and the total proportion of the middle layer is 60%-75%. The inner layer is a dynamic covalent bond rubber material and contains 5%-10% of a vulcanizing agent and 1%-3% of an antioxidant, the rubber material accounts for 80%-90%, and the inner layer accounts for 15%-25% in total. Through a multi-layer composite structure, a dynamic covalent bond self-repairing material and an optimized vulcanization process, the comprehensive performance of the water-stop belt is remarkably improved, and particularly the durability and the service life of the water-stop belt in a long-term exposure environment are improved.

The invention provides an irradiation crosslinking collagen fiber material as well as a preparation method and application thereof, relates to the field of organic high-molecular compound processing and also relates to the technical field of medical materials. According to the preparation method of the irradiation cross-linked collagen fiber material, for the problem that protein is excessively and rapidly cross-linked in the irradiation process, the excitation rate of electron beams to water molecule free radicals is controlled by changing a solvent system of collagen fibers, introducing part of organic solvent and reducing the moisture content; therefore, the crosslinking degree of irradiation to the collagen material is controlled; furthermore, uniform crosslinking of the collagen fibers is realized by introducing a dispersing agent and controlling the irradiation dose, the irradiation temperature, the material thickness and other processes; and uniform plasmid is carried out on the collagenous fibers by a homogenizing process after irradiation, so that the injectability of the material is realized, and the physical and chemical properties and enzymolysis resistance of the obtained irradiation cross-linked collagenous fiber material are greatly improved.

The invention discloses a reinforced and toughened composite polyethylene material for plastic pipe processing and a preparation method thereof, and belongs to the technical field of polyethylene material processing. The low-density polyethylene composite material comprises the following components in parts by weight: 90-100 parts of low-density polyethylene, 8-12 parts of glycidyl methacrylate, 5-6 parts of a flame retardant, 15-22 parts of a composite filler, 20-30 parts of a reinforced elastomer, 0.5-0.8 part of an initiator and 3-5 parts of an auxiliary additive, a low-density polyethylene matrix is reinforced by a strong elastomer, a composite filler, a flame retardant and glycidyl methacrylate, so that the tensile property and impact toughness of the composite polyethylene material are effectively improved, and the flame retardance and aging resistance of the material are also improved.

The present invention belongs to the technical field of probiotic microcapsules, and specifically relates to a method for preparing microcapsules for embedding probiotics. The present invention first cultivates activated probiotics, prepares them into a probiotic suspension, and obtains a core material solution; then adds modified sodium alginate and whey protein into deionized water, disperses them uniformly by ultrasonication, and obtains a wall material solution after sterilization; finally, the core material solution and the wall material solution are evenly mixed, added into a calcium chloride solution by extrusion, and allowed to stand to form a gel, and then the gel is added into a modified carboxymethyl chitosan solution for stirring, washing, and drying to obtain microcapsules; the present invention uses modified sodium alginate, whey protein, and modified carboxymethyl chitosan as embedding materials, and realizes efficient embedding of probiotics. The prepared microcapsules have good mechanical properties, good tolerance in simulated gastric juice, simulated intestinal juice, and at 4°C, and can maintain a high survival rate and stability of the probiotics in the microcapsules.

The application discloses a preparation method of elastic semiconductor fibers and application thereof, and belongs to the field of flexible electronic materials. In view of the fact that existing semiconductor fibers are difficult to meet the demand of wearable electronics on elasticity and electrical stability, the application proposes a general method containing material compatibility driven synergistic co-spinning, anti-solvent regulated nano-phase separation and swelling induced post-crosslinking, and successfully prepares semiconductor fibers with high elasticity and high electrical performance. The breaking strain of the fiber can be more than 860%, and the fiber still has almost complete elastic recovery ability under a strain of up to 500%. After the introduction of an insulating elastomer, the electrical performance of the composite fiber is even improved. The method is suitable for various conjugated polymer systems, and the obtained elastic semiconductor fibers can be used for constructing biosensors and three-dimensional thermoelectric fabrics, and provides a general elastic semiconductor fiber construction strategy for realizing a wearable electronic system with high performance and strong conformability.

The invention provides a crosslinked polyethylene composition without pits on a rotational molding surface and a preparation method of the crosslinked polyethylene composition, and belongs to the technical field of high polymer materials. The crosslinked polyethylene composition without pits on the rotational molding surface is prepared from the following components in parts by weight: 100 parts of polyethylene resin, 0.1 to 2 parts of high-temperature organic peroxide, 0.5 to 3 parts of crosslinking aid, 0.05 to 0.5 part of nitroso ether and 0.1 to 1 part of antioxidant. The nitroso ether compound is introduced, high-activity nitroxide free radicals generated by the nitroso ether compound at a high temperature are used for quenching primary free radicals generated by decomposition of peroxide, generation of low-boiling-point byproducts is inhibited, and a rolling part product without pits in the surface of a rolling part can be obtained under the rotational molding condition of high temperature or rapid temperature rise.

This application provides a photocurable ink, an insulating coating, a battery casing, a method for preparing the same, and a battery. The photocurable ink comprises acrylic resin, an active monomer, and an initiator. The initiator promotes the polymerization reaction between the active monomer and the acrylic resin, thereby enabling the photocurable ink to cure. The initiator includes a deep-curing initiator, a shallow-curing initiator, and an amine co-initiator. The deep-curing initiator has an absorption wavelength of 300nm-400nm. The deep-curing initiator ensures that it can be effectively activated to generate free radicals even in deep regions, achieving deep curing. The shallow-curing initiator forms an excited state under light irradiation. The excited-state shallow-curing initiator abstracts hydrogen atoms from the amine co-initiator, generating active free radicals and amine free radicals. The amine free radicals can react with oxygen to generate peroxide amines, improving oxygen inhibition. During the curing of the photocurable ink, both surface and bottom layers can be cured simultaneously, thereby improving the mechanical properties of the insulating coating.

This invention relates to an ultra-high cell density organ module based on click chemistry photocurable hydrogel, its construction method, and its applications. The construction method includes: providing norbornene-modified high molecular weight hyaluronic acid with a high grafting rate and thiol-modified high molecular weight hyaluronic acid; mixing a photoinitiator, cells, HANb solution, and HASH solution; and rapidly cross-linking and curing the module through a click chemistry reaction after extremely short-term light exposure to form the organ module. This invention utilizes the synergistic effect of the high molecular weight hyaluronic acid host material and the high grafting rate modification to achieve the construction of an ultra-high cell density organ module under ultra-low photoinitiator concentration and extremely short light exposure conditions. The liver module constructed based on this method possesses extremely high cell density, good mechanical properties, and excellent liver function.

The invention relates to the field of epoxy resin copper-clad plates, and particularly discloses a high-strength epoxy resin copper-clad plate and a preparation method thereof. The modified epoxy resin is obtained by modifying epoxy resin by taking organic silicon resin as a modifier. And modifying the nano silicon dioxide with lysine to obtain the modified nano silicon dioxide. The preparation method comprises the following steps: modifying graphene oxide by using a KH-560 silane coupling agent to obtain modified graphene oxide; the preparation method comprises the following steps: uniformly mixing modified epoxy resin, modified graphene oxide, modified nano silicon dioxide, polyether amine and 2-methylimidazole to prepare an epoxy resin composition, dipping glass fiber cloth in the epoxy resin composition, and baking to obtain the prepreg. The copper foil, the 4-6 layers of prepregs and the copper foil are sequentially overlapped and placed in a vacuum laminating machine to be heated, pressurized and compounded, and the copper-clad plate is prepared.

The present application relates to the technical field of functional food materials and bio-based composite material preparation, and in particular to a high-strength sodium alginate-starch composite emulsion gel, a preparation method and application thereof. First, gelatinized starch is homogenized with sucrose fatty acid ester and vegetable oil to prepare a starch composite emulsion, and a stable emulsion system is formed by short straight-chain starch in the starch composite emulsion and vegetable oil; then the emulsion is mixed with a sodium alginate solution, and a calcium alginate network and a starch-oil composite enhanced double-network structure are constructed through pre-freezing immobilization treatment combined with a low-temperature slow calcium ion crosslinking process, thereby solving the problems of weak strength of existing sodium alginate-based emulsion gels, unstable oil and fat embedding, and difficulty in meeting complex food processing conditions, and providing an ideal animal fat replacement material for the development of healthy meat products.

This invention discloses a reinforced and toughened composite polyethylene material for plastic pipe processing and its preparation method, belonging to the field of polyethylene material processing technology. The invention comprises the following components by weight: 90-100 parts low-density polyethylene, 8-12 parts glycidyl methacrylate, 5-6 parts flame retardant, 15-22 parts composite filler, 20-30 parts reinforcing elastomer, 0.5-0.8 parts initiator, and 3-5 parts auxiliary additives. By reinforcing the low-density polyethylene matrix with a strong elastomer, composite filler, flame retardant, and glycidyl methacrylate, the tensile properties and impact toughness of the composite polyethylene material are effectively improved, as are its flame retardant properties and aging resistance.

This invention relates to a salt spray resistant and anti-aging curing coating and its preparation method, belonging to the field of coating technology. The coating includes modified epoxy resin, ternary nanocomposite filler, composite light stabilizer, hydrophobic eutectic solvent, polysiloxane-modified aromatic amine curing agent, and bio-based polyurethane curing agent. The modified epoxy resin is prepared by reacting bisphenol F epoxy resin, KH-560 silane coupling agent, and tetrabutylammonium bromide, followed by the addition of bi-terminated epoxy silicone oil, 3,3'-dithiodipropionic acid, and p-toluenesulfonic acid, and then by adding pentaerythritol phosphate and antioxidant 1010. The polysiloxane-modified aromatic amine curing agent is prepared by reacting m-phenylenediamine as a matrix, KH-560 silane coupling agent, diphenylsilanediol, and dibutyltin dilaurate. The bio-based polyurethane curing agent is prepared by reacting castor oil-modified polyol, isophorone diisocyanate, dibutyltin dilaurate, dimethylolpropionic acid, and trimethylolpropane.

The invention discloses tensile wear-resistant washable kraft paper and a preparation process thereof, and relates to the technical field of kraft paper. Comprising the following steps: 1, sequentially adding color paste, water-based acrylic resin, a preservative, a reinforcing agent, a softening agent, a curing agent and a waterproof agent into a solvent, and uniformly stirring to obtain sizing slurry; step 2, coating raw paper with the sizing agent, and sequentially carrying out extrusion, ultraviolet irradiation, primary drying, ironing and secondary drying, so as to obtain the tensile wear-resistant washable kraft paper. According to the application, the specific reinforcing agent and the waterproof agent are prepared and introduced into the sizing agent for sizing, so that the interface interaction between the sizing agent and the raw paper is effectively improved, and the flame retardant property is enhanced while the tensile strength and the wear resistance of the washed kraft paper are improved; the purpose of replacing plastic with paper, replacing leather with paper and replacing cloth with paper can be achieved.

The present invention discloses a double network hydrogel based on pre-embedded inorganic micro-nano particles and its preparation method and application, belonging to the technical field of polymer hydrogel. The preparation method of the present invention comprises mixing inorganic micro-nano particles in polymer and monomer solution, initiating polymerization and cross-linking of hydrogel monomers, obtaining a single network hydrogel embedding inorganic micro-nano particles, triggering the dissolution of inorganic micro-nano particles and releasing metal ions, thereby cross-linking the polymer to obtain a uniformly cross-linked double network hydrogel. The obtained double network hydrogel has excellent mechanical properties, high strain sensitivity, good durability, can be used as a strain sensor to monitor human body movement, and has a fast response speed. In addition, it can be used as a sensor to monitor pain signals caused by cascade reactions at the wound surface of diabetic rat models in situ.