33results about How to "Good thermodynamic compatibility" patented technology

The invention relates to the technical field of membranes, in particular to an aromatic polyamide hollow fiber membrane, a preparation method and application. The method adopts the following steps: firstly, preparing membrane casting liquid: the membrane casting solution comprises the following components in parts by weight: 30 to 35 parts of aromatic polyamide substance, 15 to 35 parts of a compound solvent, 30 to 50 parts of an additive, and 1 to 5 parts of nanometer silver ion; secondly, melting and extruding the membrane casting solution prepared in the first step with a spinneret plate at 240 to 280 DEG C through a thermally induced phase separation method, so as to form a high temperature resistant polyamide hollow fiber membrane. According to the method, the aromatic polyamide substance is molten and extruded at high temperature, so as to form the polyamide hollow fiber membrane, the adding of inorganic ion can effectively improve the solubility of aromatic polyamide and increase the content of the aromatic polyamide in the membrane casting solution, and high-temperature extrusion can improve the heat resistance of the polyamide hollow fiber membrane.

The invention provides a preparation method of a carbon fiber reinforced carbon-silicon carbide double-matrix composite material. According to the present invention, through silicon-molybdenum alloy infiltration, a molybdenum disilicide phase is introduced into a composite material matrix so as to reduce the residual silicon element and reduce the brittleness of the composite material; molybdenum disilicide has characteristics of moderate density, high melting point and good oxidation resistance, and can be converted from the brittleness to the plasticity within a certain temperature range, wherein molybdenum disilicide has a plastic deformation behavior and shows metal-like ductility when the temperature exceeds the temperature range so as to improve the fracture toughness of the composite material; molybdenum disilicide has a low thermal expansion coefficient and has good thermodynamic compatibility to silicon carbide so as to easily reduce the crack generation; and the process is simple, and the operation is easy.

The invention discloses a highly-wear-resistant plastic sheave liner and a preparation method thereof. The liner consists of the following components in parts by weight: 100 parts of nylon, 10-20 parts of aramid fiber, 15-20 parts of hollow glass beads, 5-15 parts of bauxite, 5-15 parts of barite, 1-3 parts of magnesium stearate, 0.5-1.5 parts of a titanate coupling agent, 10-15 parts of dioctyl phthalate, 1-3 parts of antimony trioxide, 5-10 parts of decabromodiphenyl ether, 10-15 parts of conductive carbon black and 0.5-1.5 parts of an antioxidant. The preparation process is simple, and the prepared plastic liner has good antistatic and flame-retardant properties, can keep relatively high tensile property, and is long in service life; and the sheave liner is good in seasoning crack resistance and moisture resistance, and is particularly suitable for use in severe environments with sprinkling water, strong corrosivity and the like in mines.

The invention discloses a comb-shaped stem grafting copolymer containing reactive group and a preparation method and application thereof. The copolymer is a comb-shaped stem grafting copolymer by taking small molecule monomer B as the main chain, and giant molecule monomer A as the side chain. According to the method, the giant molecule monomer A and the small molecule monomer B are copolymerized to form the comb-shaped stem grafting copolymer of which the main chain is the small molecule monomer B and the side chain is the giant molecule monomer A. The comb-shaped stem grafting copolymer disclosed by the invention can serve as the chain extender of a polymer or a polymer blend, the compatibilizer of the polymer blend, the hydrolytic stabilizer, adhesive and anti-leakage agent of the polymer blend, and is used for coatings of wood, metal or plastic. The reactive group in the copolymer has very high reaction activity, and can react with various end groups of polyamide and polyester. Methacrylate monomers have thermodynamics compatibility with various polymers. The reactive group can react with the end hydroxyl group or the end carboxy group of polyester, so that the comb-shaped stem grafting copolymer can serve as the chain extender, and the processing and application properties of the material are improved.

Disclosed are a ternary alloy containing an aromatic polyamide and a preparation method therefor. The ternary alloy containing an aromatic polyamide is prepared from the following raw materials in parts by weight: 70-94 parts of polyether ether ketone, 3-20 parts of polyetherimide, and 3-10 parts of an aromatic polyamide, wherein the aromatic polyamide is an aromatic polyamide containing an ether ketone structure or naphthalene. According to the disclosure in the embodiments, the ternary alloy has a friction coefficient reduced by ≥4.7%, a wear rate reduced by ≥35.3%, and significantly improved mechanical properties compared with those of a pure PEEK phase.

The invention relates to a three-dimensional curled elastic fiber and a preparation method thereof, and especially relates to an elastic fiber proto-filament, which is prepared by the following steps:taking modified co-polyester and polyethylene glycol tere-phthalate as raw materials and then subjecting raw materials to parallelly compounded asymmetric melt spinning, circular blow cooling, oiling, reeling, and bucket falling. The elastic short fiber with a three dimensional curling property is prepared by subjecting the proto-filament to following steps: bundling, drawing, oiling, tightened thermoforming, and cutting. The modified co-polyester is prepared by adding a modifying component (tween) in the synthesis process of polyethylene glycol tere-phthalate to carry out ester exchange andpolycondensation. The modifying component (tween) is an aliphatic hydrophilic flexible chain macromolecule, can form modified block co-polyester with polyester hard sections, and can obviously enhancethe water moistening property of polyethylene glycol tere-phthalate. The prepared three-dimensional curled elastic fiber has the advantages of high fluffiness and high elastic recovery rate, has a normal pressure boiling dyeing effect, and is widely used in fields such as home textile, clothes, and the like.

The invention belongs to the field of functional materials, and in particular relates to a photopolymer / liquid crystal / zinc sulfide nanocomposite holographic grating and a preparation method thereof. The present invention uses monofunctional acrylamide monomers, multifunctional crosslinking agents, liquid crystals, zinc sulfide nanoparticles, and photoinitiators as raw materials to prepare a mixed solution, which is poured into a liquid crystal box and exposed to light to obtain photopolymerization. The photopolymer / liquid crystal / zinc sulfide nanocomposite holographic grating has a diffraction efficiency higher than 90% and a driving voltage lower than 2.5 V / μm. It also has high diffraction efficiency and low driving voltage. The photopolymer / liquid crystal / zinc sulfide nanocomposite Gratings have broad practical application prospects in 3D display, modulated laser, photonic crystal fiber, data storage, environmental monitoring, biosensing and other fields.

The invention discloses a high-toughness high-modulus polypropylene composite material and a preparation method thereof. The high-toughness high-modulus polypropylene composite material consists of 50-62.5 parts of a polypropylene base body, 10-12 parts of high-density polyethylene, 12-15 parts of a polyolefin elastomer, 6-9 parts of modified wollastonite, 0.5-2 parts of nano modified particles, 1-2 parts of modified boron nitride, 5-6 parts of a compatibilizer, 1-1.5 parts of an antioxidant and 2-2.5 parts of a lubricating agent, wherein the nano modified particles are obtained by mixing a silane coupling agent and nano titanium dioxide in a weight ratio of 1 to 100. The preparation process is simple and convenient, the adopted materials are cheap, the comprehensive cost is lower than that of conventional toughness-modified polypropylene, and the produced high-toughness high-strength high-modulus polypropylene is excellent in performance. A composite system disclosed by the invention forms a polymer / flexible interface layer / inorganic particle three-phase composite system.

A fibre reinforced vinylester-resin composition with high toughness, strength and high-temp resistance is prepared from the refractory vinylester-resin composition prepared from phenolic vinylester resin, biphenol-A vinylester resin, solidifying agent and additive, and the reinforcing fibres chosen from carbon fibres, glass fibres, aramide fibres and their mixture through pulling and extruding.

The invention relates to a modified hydroxyl-terminated polybutadiene and its preparation method and application. The modified hydroxyl-terminated polybutadiene has the following structure: the modified hydroxyl-terminated polybutadiene uses HTPB as a starting material, and it is processed Chemical modification to prepare modified HTPB containing hydroxyl group, tertiary amino group and borate group or cyano group at the same time; the modified product is partially replaced by HTPB and added to the butylated hydroxyl propellant formula. The borate group or cyano group in its molecular structure The tertiary amine group can play an interfacial bonding effect on ammonium perchlorate, and can inhibit the decomposition of ammonium perchlorate. The hydroxyl group can play a cross-linking and strengthening role in the curing stage. In addition, this modified HTPB, which integrates functions such as cross-linking enhancement, interfacial bonding, and burning rate adjustment, has excellent compatibility with traditional HTPB adhesives. Polarity, enhancing thermodynamic compatibility with other functional additives.