201results about How to "Reduce the degree of crosslinking" patented technology

A heat-shrinkable article suitable for use as an insulating or coating material comprises a crosslinked composition of a polypropylene homopolymer or copolymer and an ethylene-propylene elastomer. The article is formed by a process comprising: i) creating a blend of the polypropylene homopolymer or copolymer and the ethylene-propylene elastomer by melt mixing; ii) melt processing the blend produced in i) to produce a melt processed material; iii) crosslinking the melt processed material produced in ii) by exposing it to radiation to produce a crosslinked material; iv) stretching the crosslinked material at a first temperature close to or above its softening or melting point and subsequently cooling it to a second temperature below its softening or melting point, to thereby freeze the crosslinked material in its stretched form. Subsequent heating of the article close to or above its softening point or crystalline melting point results in recovery of the pre-stretched dimensions of the article. Due to its relatively high content of polypropylene, the heat-shrinkable article thus produced has greater toughness and rigidity than polyethylene-based systems, making it suitable for use as insulation for wires and cables a heat-shrinkable corrosion resistant sleeves for high-temperature transmission pipeline joints, and for heat-shrinkable tubing or shapes for electrical insulation and mechanical protection.

The invention discloses a high-flexibility melamino-formaldehyde foam material and a preparation method thereof. The preparation method comprises: firstly, preparing melamino-formaldehyde prepolymer modified by polyol into aqueous solution with definite weight concentration; weighting 100 parts by weight of prepolymer aqueous solution; adding 0-15 parts by weight of surfactant, 1-20 parts by weight of foaming agent, 0-10 parts by weight of accelerator and 0-10 parts by weight of curing agent to be fully stirred and mixed to prepare foaming liquid; filling foaming liquid into a microwave chemical reactor or a high-temperature oven; and foaming for 30s-15min at the temperature of 100-300 DEG C to prepare the foam material. The melamino-formaldehyde foam material disclosed by the invention solves the problems of big brittleness, poor flexibility, easy duslting of foam, complex preparation technology, high production cost and the like of the existing melamino-formaldehyde foam material and has wide application prospect.

The invention discloses polyvinyl alcohol/inorganic nanocomposite hydrogel, which is characterized by being formed by the following components: 30-90 parts by weight of polyvinyl alcohol and 0.1-20 parts by weight of inorganic nanocomposite particles through a chemical crosslinking gel method, wherein the inorganic nanocomposite particles comprise nano clay, nano mica powder, a nano molecular sieve, nano wollastonite, nano graphite, nanosilicon dioxide or a carbon nano tube. With the adoption of the polyvinyl alcohol/inorganic nanocomposite hydrogel, the mechanical strength of polyvinyl alcohol hydrogel is enhanced on the basis of not influencing the moisture of the hydrogel, the service life is prolonged, the permeability of the polyvinyl alcohol hydrogel is improved, and a channel is reserved for transmission of matters. As the selection of the materials, the production cost is controlled, and the better economic benefit is brought. The invention also discloses a preparation method of the polyvinyl alcohol/inorganic nanocomposite hydrogel. The preparation method is simple and feasible to operate and good in mechanical strength, and can be produced industrially.

The invention relates to a method for separating and purifying human immunoglobulin from a component I+III of blood plasma, and aims to provide a high-efficiency method for recovering high-purity human immunoglobulin. According to the technical scheme provided by the invention, the method comprises the following steps of: a, fully dissolving component I+III precipitate; b, precipitating with octylic acid and removing lipid and a part of impurity protein to prepare IgG (Immunoglobulin G); c, purifying through anion exchange column chromatography; and d, collecting flow-through liquid, performing membrane nanofiltration, ultrafiltration and concentration, preparing the human immunoglobulin, sterilizing and packaging. The method has the beneficial effects of capability of being operated at the room temperature, simple and short steps, high yield, low energy consumption and high output and is suitable for mass production; comprehensive utilization of the blood plasma is fully realized; the time of the entire production process is shortened; the cost is reduced; extremely considerable economic benefit can be produced; the safety of a product is guaranteed by using two virus inactivation/elimination methods of different mechanisms; the environmental pollution is avoided; and the method has high economic and social values.

An acrylic adhesive composition, an optical film and a liquid crystal display using the same, wherein the acrylic adhesive composition has excellent impact resistance, which improves resistance to external impact of an optical film, increases the wide viewing angle and brightness of an image display, such as a liquid crystal display, and increases durability of the optical film under heat and moist heat conditions. The acrylic adhesive composition having excellent impact resistance includes (a) 100 parts by weight of an acrylic copolymer, (b) 0.01˜10 parts by weight of a crosslinking agent, and (c) 0.5˜20 parts by weight of a polymer having an amino group, the acrylic copolymer being obtained by copolymerizing (1) 0.5˜10 wt % of a vinylic monomer having no carboxyl group, (2) 0.5˜20 wt % of a vinylic monomer having a carboxyl group, and (3) a balance of a (meth)acrylic acid ester monomer having a C1˜C12 alkyl group.

The invention relates to polyving alcohol composite hydrogel and a preparation method thereof. The polyving alcohol composite hydrogel is prepared from the following raw materials in parts by weight through cross-linking solidifying compounding of boric acid solution containing solidifier: 30 to 90 parts of polyving alcohol, 0.1 to 50 parts of sodium alginate, 0.1 to 20 parts of inorganic nanoparticles, 1 to 20 parts of elastomer material, 0.5 to 5 parts of coupling agent and 200 to 2000 parts of water, wherein the degree of polymerization of polyving alcohol is 400 to 3000, and the alcoholysis degree is 75 to 99 percent. The polarity elastomer material and the inorganic nanoparitcles which are processed through the coupling agent are compounded with the polyving alcohol, the mechanical strength and flexibility of the polyving alcohol hydrogel can be improved through the toughening effect of the elastomer material and the synergistic effect of the inorganic nanoparticles, so that the service life is prolonged, and the requirement of the real application on the mechanical performance can be met; the preparation method of the polyving alcohol composite hydrogel is simple in process, easy to operate and applicable to the mass production.

The invention belongs to the field of a high molecular material, and particularly relates to photo-cured elastic photosensitive resin with wavelength being 405 nanometers for 3D printing of digital light processing (DLP). The elastic photosensitive resin comprises the following raw materials based on parts by weight: 10-50 parts of elastic acrylate, 30-70 parts of active diluents, 1-10 parts of photoinitiator, 0.01-0.05 part of flatting agent, 0.01-0.05 part of dispersning agent and 0.01-0.05 part of polymerization inhibitor. The elastic photosensitive resin can be directly used for 3D printing of DLP or can be mixed with other existing photosensitive resin, a product with a complicated structure and certain elasticity can be printed, meanwhile, the elastic photosensitive resin has the characteristics of small volatile odor, rapid formation speed, small product shrinkage rate, high formation accuracy and the like.

The invention discloses a cutting method of a liquid crystal panel, and a liquid crystal panel obtained by the cutting method. Specifically, the cutting method comprises the steps of shielding seal adhesive in a cutting area on a substrate; curing the seal adhesive in the cutting area by using ultraviolet light curing and thermocuring; and cutting the liquid crystal panel along a cutting line on the cutting area. By shielding the seal adhesive in the cutting area, in a subsequent ultraviolet light curing process, ultraviolet light curing rate of the seal adhesive in the cutting area is very low because of shielding; and toughness, crosslinking degree and binding strength to the substrate of the cutting area after a thermocuring process are reduced obviously. Due to incomplete curing of the seal adhesive, poor cutting phenomena such as edge breakage and burrs in the cutting process can be prevented. Besides, the cutting method is implemented only by using cutter wheel cutting but laser cutting, thereby reducing process difficulty, shortening processing time, increasing cutting efficiency of a single liquid crystal panel and reducing production cost.

The present invention relates to core-shell type polymer microspheres, preparation and applications thereof. The preparation comprises: adding deionized water, an emulsifier and a dispersing agent to a reaction kettle, slowly stirring and dissolving, adding a styrene base monomer, a vinyl polymer cross-linking agent and an initiator, introducing nitrogen to replace air of the reaction kettle, heating to a temperature of 70-85 DEG C, reacting to form a core structure, adding a reaction solution containing acrylate, a styrene base monomer, a vinyl polymer cross-linking agent and an initiator in a dropwise manner, forming a shell structure on the core structure surface, cooling to a room temperature, discharging the material, and filtering to obtain the product. According to the core-shell type polymer microspheres of the present invention, the internal core structure is formed by the reaction of the styryl monomer and the vinyl polymer cross-linking agent, the shell layer of the microspheres is formed through the copolymerization of the acrylate, the styrene base monomer and the vinyl polymer cross-linking agent, and produces volume expansion under the downhole oil-gas effect so as to bond and seal the micro-crack in the cement sheath or the interface micro-gap, and the sufficient strength of the microspheres after expanding is ensured through the core portion of the microspheres.

The invention relates to a hollow fiber compound nanofiltration membrane. The nanofiltration membrane takes a porous supporting layer as an inner layer and a separating function layer as an outer layer. A casting membrane solution of the porous supporting layer contains an inner layer macromolecular polymer which is selected from one or more of polysulfone, polyether sulfone, polyvinylidene fluoride, polyvinyl chloride and polyacrylonitrile; a casting membrane solution of the separating function layer contains an outer layer macromolecular polymer which is selected from one or more of polyetherimide, polyether-ether-ketone, sulfonated polyether-ether-ketone, polymethyl methacrylate and polyvinyl alcohol; a preparation method comprises the following steps: synchronously extruding and molding the inner layer casting membrane solution and the outer layer casting membrane solution; solidifying to obtain a membrane filament in a nascent state; and carrying out an oxidizing agent aqueous solution to obtain the hollow fiber compound nanofiltration membrane. The invention further provides the preparation method of the nanofiltration membrane correspondingly. According to the hollow fiber compound nanofiltration membrane provided by the invention, the flux of the nanofiltration membrane is remarkably improved, and moreover, the nanofiltration membrane further has the certain desalinization rate.

The invention relates to an energy-containing fragment with nanometer Al/M<x>O<y>/oxidizing agents.The energy-containing fragment comprises, by weight, 10-30% of nanometer aluminum powder, 30-60% of transition metal oxide (the M<x>O<y>), 10-40% of the oxidizing agents, 1-5% of ferrocene, 1-7% of high explosive and 3-8% of mixed binders.The energy-containing fragment has the advantages that the energy-containing fragment is high in energy density and fire setting capacity, good in safety performance and easy to ignite, immediate reaction can be prevented when the energy-containing fragment is driven by explosive, but violent chemical reaction can be carried out in penetration procedures, extremely high-temperature heat can be released, and high-temperature hot reaction products with flowability can be generated.

The invention discloses a thermosetting acrylic resin used in paint with the number average molecular weight ranging from 10000 to 50000, as well as the high-temperature firing polyvinylidene fluorine (PVDF) coiled materials with the resin; the copolymer section of the resin comprises the methyl methacrylate ranging from 40.0wt.% to 90.0wt.%, the alkyl acrylate ranging from 10.0wt. % to 60.0wt.% (the atomicity of alkyl carbon is no more than 4) as well as the functional acrylic monomer ranging from 0.1wt.% to 10.0wt.%. With dramatic miscibility with PVDF resin, the invention has the advantages of improving the protective effect and aging resistance of paint film and enhancing the transparency and flexibility of the paint film effectively when used in high-temperature firing polyvinylidene fluorine (PVDF) coiled materials.

The invention discloses a preparation method of a glycidyl methacrylate melt-grafted polyolefin material. The preparation method comprises the following steps: directly adding glycidyl methacrylate and graphene oxide onto polyolefin pellets or powder, uniformly mixing at normal temperature, and adding the physical mixture into reaction equipment; and uniformly mixing an initiator and a styrene liquid, adding the mixture into the above reaction equipment, and melt-blending at a certain temperature. The prepared glycidyl methacrylate grafted polyolefin has high grafting rate and high molecular weight or high grafting rate and low crosslinking degree.

A process for producing a polysaccharide sponge comprises the steps of (A) freezing a photoreactive polysaccharide solution, and (B) irradiating the frozen photoreactive polysaccharide solution with light to crosslink the photoreactive polysaccharide, thereby obtaining the polysaccharide sponge. The process includes simplified steps requiring no removal of solvent, and has such an advantage that impurities are easily removed therefrom.

An object of the present invention is to provide a golf ball showing excellent shot feeling and stain resistance. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein a base resin constituting the paint film includes a polyurethane obtained by a reaction between a polyol composition and a polyisocyanate composition, a molar ratio (NCO/OH) of an isocyanate group (NCO group) in the polyisocyanate composition to a hydroxyl group (OH group) in the polyol composition is 0.6 or more, and the paint film has an elastic modulus of 300 MPa or less.

This invention relates to a method for separating basic amino acids from fermentation broth comprising contacting the broth with strong acid cation exchange resins that have a low degree of cross-linkage and eluting the amino acid. The method described herein results in higher yield and higher purity of lysine, in addition to higher throughput, as compared to conventional processes of purification of lysine from fermentation broth.

The invention relates to a low-temperature toughened and reinforced PC/PBT (polycarbonate/polybenzothiazole) alloy material and a preparation method thereof. The PC/PBT alloy material is prepared from raw materials such as PC resin, PBT, a low-temperature toughening agent, a reinforcing agent, a bulking agent and an antioxidant, wherein the toughening agent is diolefin-styrene-methyl methacrylate (MBS/MIS) which is of a core-shell structure, the reinforcing agent is non-alkali chopped glass fiber, the bulking agent is an ethylene-methyl acrylate copolymer (EMA), and the antioxidant is prepared by compounding an antioxidant 1010 and an antioxidant 168. The preparation process disclosed by the invention is implemented by using single and double screw extruders in cooperation with a two-step extrusion process, the technical characteristic is stepwise feeding, and the preset temperatures of the two extruders are differentiated. Through the implementation of the formula and the process, a low-temperature-resistant and high-strength PC/PBT alloy material which is excellent in performance and good in appearance can be prepared, and the PC/PBT alloy material can be widely used in the aspects of auto parts, bumpers, elevator parts, electrical and electronic engineering, engineering assembly parts for cold regions, and the like.

The invention discloses a mesoporous carbon and silicon nano-sphere and a method for preparing the same. The mesoporous carbon and silicon nano-sphere comprises mesoporous silicon dioxide nano-spheres and carbon. The mesoporous silicon dioxide nano-spheres are biodegradable nano-spheres; the carbon is distributed on the surfaces of hole walls of the mesoporous silicon dioxide nano-spheres. The method includes carrying out hydrothermal polymerization on the surfaces of the hole walls of the biodegradable mesoporous silicon dioxide nano-spheres by the aid of carbon sources such as glucose; carbonizing the biodegradable mesoporous silicon dioxide nano-spheres to obtain the biodegradable mesoporous carbon and silicon nano-sphere. The mesoporous carbon and silicon nano-sphere and the method have the advantage that the mesoporous carbon and silicon nano-sphere is excellent in biodegradability.

The invention provides a polyamide reverse osmosis membrane and a preparation method thereof. The membrane comprises a porous support membrane and a carbon quantum dot-containing polyamide layer growing on the surface of the porous support membrane, and the carbon quantum dot-containing polyamide layer comprises the following raw material components: aminated carbon quantum dots, an oil-phase reaction monomer, an oil-phase solvent, an acid acceptor, a pH regulator and a surfactant; the preparation method comprises the following steps: 1, preparing aminated carbon quantum dots; and 2, preparingthe polyamide reverse osmosis membrane. According to the polyamide reverse osmosis membrane disclosed by the invention, the aminated carbon quantum dots are used as a novel water-phase reaction monomer, and a polyamide layer structure containing the carbon quantum dots is formed on the polysulfone porous support membrane by directly carrying out a cross-linking reaction on amino groups on the aminated carbon quantum dots and trimesoyl chloride, so that the water flux can be improved from multiple aspects.

The invention belongs to the field of membrane materials and discloses a PDMS/PEI (Polydimethylsiloxane/Polyetherimide) separating membrane and a preparation method of the separating membrane as well as the application of the separating membrane. The preparation method comprises the following steps of: preparing high polymer emulsion of organic silicon by adopting an emulsion polymerization method, further crosslinking into silicone rubber under the effects of a catalytic agent and a cross-linking agent, and forming the PDMS/PEI composite membrane on a basement membrane through high temperature curing. The siloxane prepared by the preparation method has high molecular weight; the prepared membrane has smooth and compact surfaces without defects and is tightly combined with PEI. The membrane prepared by the method is pollution-free and non-toxic. The prepared separating membrane is used for separating and recovering organic gases, thereby higher selectivity is obtained.

The invention provides a polyamide composite nanofiltration membrane and a preparation method thereof.The polyamide composite nanofiltration membrane comprises a supporting base layer and a polyamidefunctional layer obtained on the supporting base layer through interfacial polymerization, and the polyamide functional layer comprises raw materials including diamine, inorganic salt, organic acid, polybasic acyl chloride, an oil-phase solvent and deionized water; wherein the diamine comprises at least one of piperazine, hexamethylenediamine, diaminopyridine and diaminopyrimidine; and the inorganic salt comprises at least one of lithium chloride, calcium chloride, sodium chloride, magnesium sulfate, lithium bromide and calcium bromide. The preparation method comprises the following steps: step 1, preparing a water-phase solution; step 2, preparing an oil-phase solution; and step 3, preparing the polyamide composite nanofiltration membrane. The water flux of the polyamide composite nanofiltration membrane prepared by the method is as high as 73.7 LMH, the rejection rate of divalent salt is as high as 99.31%, and the rejection rate of monovalent salt is as low as 31.83%. The preparationmethod is simple, short in technological process and low in cost.

The invention discloses a polyurethane adhesive containing epoxy-terminated polyether and a preparation method and belongs to the field of adhesives. The epoxy-terminated polyether adopts such a structure that polyether is taken as a main chain and an epoxy group is taken as a terminal group; the polyether main chain can improve the wettability and the ageing resistance of the polyurethane adhesive; the epoxy group does not participate in a reaction of the polyurethane adhesive at the normal temperature, when the polyurethane adhesive is hydrolyzed through boiling at the high temperature of higher than 100 DEG C, the epoxy group can react with a hydroxyl group or a carboxyl group after hydrolysis of the polyurethane adhesive, reduction of the crosslinking degree of the adhesive is relieved, the high-temperature resistance of the polyurethane adhesive is improved, and a composite film can be prevented from losing the adhesive property when being boiled at the high temperature under the condition that the content is contained.