65results about How to "Avoid gel phenomenon" patented technology

The invention discloses a method for preparing polyester staple fibers by using a waste polyester raw material. The method comprises the following steps of: cleaning and drying waste polyester, and performing compression aggregation and granulation; drying, conveying into a reaction type vented screw extruder, and adding phenyl bis-oxazoline and N, N'-carbonyl bis-caprolactam polyester chain extenders which are 0.5 to 3 mass percent of granules; conveying the polyester granules and the chain extenders to the reaction type vented screw extruder together, melting and mixing; and weighing a melt and conveying to a spinning unit to prepare the polyester staple fibers. The degradation of the waste polyester in the processing and using processes can be improved, the molecular weight of the waste polyester is improved, and the processing efficiency and fiber quality of the polyester fibers are improved. The prepared polyester fibers can be used for filling materials of clothing and furniture fabrics, geotextiles, roofing felt base cloth, nonwoven fabrics of insulating materials, shoe covers, wiping cloth and several disposable nonwoven products.

The invention provides polyurethane resin. The polyurethane resin is mainly prepared from, by weight, 150 parts to 200 parts of polyols, 10 parts to 45 parts of chain extender, 100 parts to 150 parts of isocyanate, 0.1 part to 10 parts of antioxidant, 0.1 part to 1 part of reaction terminator, 500 parts to 800 parts of solvent and reaction activity regulator. The polyols contain 40 percent to 70 percent of PTMG, 0 to 45 percent of polyester polyol, 0 to 15 percent of polycarbonate diol, 0 to 25 percent of polycaprolactone diol and 5 percent to 10 percent of modified polydimethylsiloxane diol. The invention further provides a preparation method and application of the polyurethane resin. Tiny and even cells can be formed when the prepared polyurethane resin is used for processing superfine fiber synthetic leather, and thus the produced superfine fiber product can have fine fold lines and plump fleshy feeling.

The invention relates to bio-degradable polyester and a method for preparing the same, and belongs to the technical field of bio-degradable copolyester products. The number-average molecular weight of the bio-degradable polyester material is 6,000 to 135,000g/mol, the molecular weight distribution is 1.2 to 6.5, and the crystallization temperature range is between 15 and 105 DEG C; the bio-degradable polyester overcomes defects existing in conventional products and can be used for producing film-forming materials, sheets and foam materials, the sticking characteristics are greatly changed in the machining process, and the appearance quality is higher; and after the heat resistance is improved, the novel polyester material can also be used in the machining process with a long cycle period, such as an injection machining process, and the bio-degradable aliphatic/aromatic polyester material provided by the invention possesses excellent mechanical properties.

The invention discloses a biodegradable composition and a preparation method thereof, which consist of a biodegradable homopolyester (A), a biodegradable copolyester (B) and a chain extender (C), the total weight of which is 100 parts by mass Calculated, containing (A+B) is 95.0~99.9 parts and containing C is 0.1~5.0 parts, wherein the ratio of A:B is in the range of 1:9~9:1. The present invention finds that the compounding of biodegradable homopolyester with faster biodegradation rate and biodegradable copolyester with better processability in different proportions can not only endow the composition with proper biodegradation rate, but also improve the composition The physical properties and processing performance can be properly adjusted according to the requirements of different processing and application fields; we also found that by introducing a chain extender with long chain characteristics into the biodegradable resin composition, the combination after chain extension can be avoided It can prevent unnecessary gel phenomenon during processing and improve the heat resistance and stability of the material.

The invention relates to a preparation method for a hyperbranched polymide film with the low dielectric constant. A series of the low-dielectric constant PI films with a hyperbranched structure are synthesized by taking 2,4,6-triaminopyrimidine (TAP) as a branching center through a one-step method. Through introduction of the hyperbranched structure, the dielectric constant of the PI film is significantly lowered, the inherent advantages of PI are better kept, and the good mechanical strength and thermo-oxidative stability are supplied to the film. The hyperbranched structure contains a large quantity of molecular chain end groups, dense packing of molecular chains is effectively inhibited, and therefore the hyperbranched PI film has the excellent dissolution characteristic to be more prone to be processed into a complex device. Compared with a Kapton standard film which is generally used at present, under the same testing conditions, the dielectric constant of the hyperbranched PI film prepared through the method is lowered by 20%-40%, the lowest dielectric constant even gets close to 2.0 and reaches the ultralow dielectric constant level, and the urgent demand for micro-electronic industry development in future can be met.

The invention relates to the technical field of materials for lithium-ion batteries, in particular to a high-nickel base cathode paste for a lithium-ion battery and a preparation method of the high-nickel base cathode paste. The cathode paste is prepared from the following raw materials in parts by weight: 80-98 parts of a high-nickel cathode material, 2-18 parts of a binder, 1-10 parts of a carbon nanofiber and 0-10 parts of a conductive agent; a chemical formula of the high-nickel cathode material is LiNi<x>M<1-x>O<2>, wherein x is smaller than or equal to 1 and greater than or equal to 0.5; M is CO, Mn, Al, Mg or Cr; the binder is a modified polyvinylidene fluoride binder; a solvent is N-methyl pyrrolidone; and a certain amount of the solvent is used to make the solid content of the cathode paste reach 40-70%. According to the preparation of the paste, the gel phenomenon of the paste in the preparation process is avoided; and the subsequent performance of the lithium-ion battery is improved.

The invention relates to the preparation method of a polymer compound and a plant used therefor, in particular to a continuous solution polymerization process of optical-grade poly(methyl methacrylate) and the plant used therefor. The plant used for the continuous solution polymerization process of optical-grade poly(methyl methacrylate) comprises a refining and distillation device, a polymerization reaction device, a two-stage devolatilization device, and a wire-drawing and granulation device connected with each other in series, and specifically comprises a feed refining tower, a polymerization reaction groove, a recovering and refining tower, heaters a and b, and devolatilization tanks a and b. The continuous solution polymerization process can prepare optical-grade poly(methyl methacrylate) from monomers, a copolymer, a stabilizing agent, a molecular weight regulator, an initiator and a solvent according to the following four steps: (1) refining and distillation, (2) polymerization reaction, (3) flash devotilization and (4) wire drawing and granulation. The PMAA produced by the process has the advantages of high safety, no gel accumulation, improved physical properties and color of the produt, low energy consumption, environmental protection, clean production, good weathering resistance of the product, anhydrous polymerization, no black spots on the product, etc.

The invention discloses a waterborne epoxy resin modifier for emulsified asphalt and a preparation method and an application method thereof, and belongs to the technical field of road materials. The waterborne epoxy resin modifier for emulsified asphalt is prepared from the following ingredients: liquid epoxy resin, a solvent, an initiator, an acrylic monomer, a neutralizer and an amino protectant. The amino protectant is used for reducing activity of secondary amine of the liquid epoxy resin. The invention aims to provide a waterborne epoxy resin modifier for emulsified asphalt and a preparation method and an application method thereof to solve the problem that suitability between waterborne epoxy resin and emulsified asphalt is poor, demulsification is slow and high-temperature pull strength is low. Thereby, the product is more practical and has industrial utilization value.

The invention relates to the field of tile binders, and provides a paste tile binder. The paste tile binder at least comprises the following raw materials in parts by weight: 50-100 parts of an emulsion, 100-250 parts of a solvent, 1-6 parts of a coalescing agent, 0.5-4 parts of a defoaming agent, 1-10 parts of cellulose ether, 0.1-2 parts of butyl alcohol polyether, 300-400 parts of filler and 300-400 parts of quartz sand.

Disclosed is a method for recycling silicon cutting waste mortar. The method comprises the steps of performing solid-liquid separation of the waste mortar; performing solid flow washing and vacuum filtration; drying the obtained filter cake, mixing with deionized water and performing activation reaction; adding water glass and sodium hydroxide successively and performing heating reaction, performing solid-liquid separation of the obtained product, performing ion exchange resin decolorization and distillation of the liquid phase to obtain silica sol, and performing solid phase washing and drying to obtain a silicon carbide raw material; and performing ultra precision filter of obtained liquid phase after solid-liquid separation of the waste mortar, adding a decoloring agent a filter aid to perform solid-liquid separation, reducing the conductivity, and heating and evaporating water to obtain finished polyethylene glycol cutting liquid. According to the technical scheme of the method, the flow line production is achieved, the silicon cutting waste mortar is recycled, the silica sol is prepared effectively, and the environmental pollution is reduced.

The invention provides hydroxyl resin for an organic silicon-coated material and a preparation method of the hydroxyl resin. The hydroxyl resin for the organic silicon-coated material is prepared from hydrochloric acid, ethanol, ethyl orthosilicate-40, hexamethyldisiloxane, water, an aqueous sodium carbonate solution and hydroxyl-terminated polysiloxane through the steps of mixing, reacting and solvent removing. The organic silicon-coated material prepared from the hydroxyl resin for the organic silicon-coated material not only has the advantages of being low in viscosity, high in strength, short in curing time and the like, but also has the properties of being resistant to high and low temperature and aging, flexible, insulative, dampproof, resistant to shake, corona, electric leakage and cold and hot changes and the like; the preparation method is simple, environmentally friendly and free of pollution and has important significance in promoting application and development of the organic silicon-coated material.

The invention discloses a PIA (meta-phthalic acid)/nanometer titania modified alkyd resin and a preparation method thereof. The PIA/nanometer titania modified alkyd resin comprises the following raw materials: acrylic acid, methylacrylic acid, methyl methacrylate, vinyltriethoxysilane, nanometer titania, epoxy resin, castor oil, trimethylolpropane, 2,2,4-trimethyl-1,3-pentanediol, tetrachlorophthalic anhydride, PIA waste, trimellitic anhydride, triethylamine, ethyl eneglycol monobutyl ether, propylene glycol mono-n-butyl ether, lauric acid, catalytic auxiliary, benzoyl peroxide, dimethylbenzene and water. The PIA/nanometer titania modified alkyd resin provided by the invention is good in water resistance, high in hardness and excellent in comprehensive performance; the PIA waste is used, so that the cost is saved.

The invention discloses an adhesive mixing device. The adhesive mixing device comprises a base, wherein a casing is arranged above the base, a vibration motor is mounted in the middle of the bottom end of the casing, two opposite arc-shaped electric field plates are arranged outside the casing, a stirring shaft is arranged in the axis position of the casing, stirring blades are arranged on the stirring shaft, an L-shaped supporting arm is welded on the base on one side of the casing, a servo motor is fixed on the bottom surface of the top of the supporting arm, and a controller is arranged on the outer side surface of the supporting arm. When the stirring shaft of the adhesive mixing device drives the stirring blades to rotate for stirring, the vibration motor at the bottom of the casing vibrates the casing, a mixed adhesive on the inner wall of the casing falls off, the condition that gel is produced due to the fact that the mixed adhesive stays on the inner wall of the casing for a long time and the stirring blades cannot scrape the mixed adhesive is prevented, and electric fields produced by the two electric field plates on the outer side of the casing enable the mixed adhesive in the casing to have a delicate change in the aspect of the microstructure, so that the gel phenomenon is prevented.

The invention discloses a device for preventing an acrylate adhesive from gelating. The device comprises a high-voltage electric field treatment part positioned on an adhesive flowing plate. The high-voltage electric field treatment part is composed of a fixed plate, an electric field plate, a field distance adjustment part and guide rods. The electric field plate is arranged below the fixed plate. The field distance adjustment part is directly connected to the electric field plate through a hole disposed at the middle part of the fixed plate, and the distance between the electric field plate and an adhesive flow upper surface can be controlled by adjusting the field distance adjustment part. The guide rods control the directional stability of the electric field plate, which can directly act on the acrylate adhesive flowing on the adhesive flowing plate through a KV-KV high-voltage uniform electric field. By means of a physical treatment method, the microstructure of the acrylate adhesive body can have delicate change so as to prevent the occurrence of gelating. Thus, the device provides guarantee for the adhesive utilization rate and adhesive tape yield.

The invention belongs to the technical field of milk food preparation, and particularly relates to an additive-free normal-temperature yoghourt and a preparation method thereof. Main raw materials ofthe normal-temperature yoghourt only comprise three main components of liquid milk, a sweetener and nostoc sphaeroides, and addition of additional stabilizers and acidity regulators is not needed. Theproduct provided by the invention can be stored at normal temperature for 5 months, and the yoghourt has thick, pure and delicious flavor and mellow and smooth taste. After the product is placed at normal temperature for 5 months, the product basically has no phenomena of water seepage, bad flavor, protein coagulation and precipitation phenomena, and has stable mouthfeel and longer shelf life. Finally, it proves that the product has a reasonable formula, good flavor and smooth mouthfeel. According to the preparation method disclosed by the invention, the nostoc sphaeroides powder is subjectedto hydration and independent fermentation treatment, so that polysaccharide substances of the nostoc sphaeroides powder are effectively dissolved out, and bad flavor brought by the nostoc sphaeroidespowder is also modified. According to the invention, viscosity and stability of the product are successfully improved in a green mode, and the normal-temperature yoghourt with clean ingredients is prepared.

The invention relates to a damp-proof using method of a polymethacrylate pressure-sensitive adhesive. The method comprises steps as follows: Step 1) evenly mixing a solvent type polymethacrylate pressure-sensitive adhesive and a solvent to prepare an adhesive diluent; Step 2) evenly mixing a solvent and a water removing agent with the mass accounting for 0.5%-5% of the dry weight of the solvent type polymethacrylate pressure-sensitive adhesive, and adding the mixture to the adhesive diluent; Step 3) evenly mixing a solvent and a water removing agent catalyst with the mass accounting for 5%-50% of the pure mass of the water removing agent, and adding the mixture to the adhesive diluent; Step 4) evenly mixing a catalyst of an isocyanate curing agent and a solvent, and adding the mixture to the adhesive diluent; Step 5) evenly mixing the isocyanate curing agent and a solvent, and adding the mixture to the adhesive diluent to obtain a polymethacrylate adhesive coating liquid; Step 6) coating the surface of a base material with the adhesive coating liquid, and performing desolvation, curing and post-curing in a drying oven to obtain the polymethacrylate adhesive product.

The invention relates to an electric connector terminal. A sheet-shaped metal body is punched and bent so as to form the electric connector terminal. The electric connector terminal is composed of a welding portion and a conductive insert core inserting portion. The cross section of the welding portion is U-shaped and is arranged along a direction away from the conductive insert core inserting portion; the welding portion comprises a first wire pressing area and a second wire pressing area which are connected in sequence; the left side and right side of the first wire pressing area are respectively provided with a left pressing wire elastic sheet and a right pressing wire elastic sheet; and the first wire pressing area comprises an adhesive stopping plate which is transversely placed in the cavity of the first wire pressing area. In this way, the adhesive stopping plate can effectively prevent liquid plastic from entering the conductive insert core inserting portion along the welding portion in an injection molding process, and therefore, adhesive solidification occurring on an elastic contact arm is avoided. In addition, the adhesive stopping plate can be used for limiting the insertion length of a conductive insert core, so that the convenience and consistency of construction are improved.