8results about How to "Improve chain movement ability" patented technology

The application discloses a solvent-free phenolated lignin-based polyurethane elastomer and a preparation method and application thereof. A phenolated lignin with high phenolic hydroxyl content is prepared first, and then the phenolated lignin is dispersed in a polyol, and a lignin-based polyurethane elastomer rich in dynamic phenol-type urethane bonds is synthesized by using a one-step solvent-free method, and the synthesis process is green and simple. The phenolated lignin has a lower molecular weight, a higher hydroxyl content and a higher reactivity, and the polyurethane elastomer synthesized by using the phenolated lignin has a double dynamic crosslinking network composed of a phenol-type urethane network and a hydrogen bond crosslinking network. The obtained solvent-free phenolated lignin-based polyurethane elastomer has excellent mechanical properties, reprocessing properties, light-heat self-healing properties and thermal-oxidative aging resistance. The contradiction between the mechanical properties and dynamic mechanical properties of traditional polyurethane elastomers is solved, and a new idea is provided for developing green and multifunctional polyurethane elastomers in future industrial fields.

The present application relates to the technical field of polyester material modification, and particularly relates to a high-transparency polyethylene naphthalate material, a preparation method and application, aiming at the problems of fast crystallization rate of the PEN material in the process of processing and molding, easy crystallization of thick products, light transmittance reduction caused by the crystallization, and insufficient material toughness, the present application introduces a diol monomer containing a side group and a flexible chain segment diol monomer into the PEN melt polycondensation process for copolymerization, wherein the diol containing a side group introduces a steric hindrance structure in the molecular chain to destroy the regular packing of the PEN molecular chain, thereby inhibiting the material crystallization behavior and improving the light transmittance of the thick product; the flexible diol introduces a flexible chain segment in the molecular chain to increase the free volume of the molecular chain and improve the molecular chain movement ability, thereby improving the material toughness. Through the above-mentioned synergistic copolymerization modification method, the crystallization tendency of the PEN material can be effectively reduced, the obtained PEN thick product has excellent light transmittance and toughness at the same time, and is suitable for the preparation of high-performance transparent polyester products.

This invention discloses a powder coating and its preparation method, belonging to the field of powder coating technology. The powder coating comprises a composite filler with a core-shell-whisker structure. The composite filler includes: a core layer, which is a one-dimensional inorganic thermally conductive material; an intermediate layer, which is composed of polydopamine and coated on the outer surface of the core layer; and an outer shell layer, which is composed of a reactive elastomer and chemically grafted onto the outer surface of the intermediate layer. This invention also discloses the preparation method of the powder coating and its application in electrical insulation components. By constructing a core-shell-whisker structure composite filler and using polydopamine as the intermediate layer to chemically graft reactive elastomer onto the surface of a one-dimensional inorganic thermally conductive material, this invention achieves a synergistic improvement in mechanical properties, thermal conductivity, and insulation properties, and endows the coating surface with self-healing scratches.

The application provides a polymethyl methacrylate product and a preparation method thereof. The preparation method of the polymethyl methacrylate product comprises the following steps: S1. mixing a resin matrix, a toughening agent, an antioxidant and a light stabilizer to obtain a mixture; the resin matrix comprises a polymethyl methacrylate resin; the toughening agent comprises a core-shell structure toughening agent and a polyester-based toughening agent; the core-shell structure toughening agent comprises a core and a shell layer; the core comprises polybutyl acrylate, and the shell layer comprises polymethyl methacrylate; S2. melt blending, extruding and granulating the mixture, and drying, injection molding, cooling and annealing. In the application, the core-shell structure toughening agent and the polyester-based toughening agent can synergistically improve the toughening effect.

This invention discloses an integrated molding process for automotive suspension buffer blocks, relating to the technical field of automotive suspension system components. To address the problems of uneven microporous structure, mismatched foaming-gel rates, long production cycles, poor low-temperature performance, and insufficient insert bonding strength in existing processes, the key technical points are: S1: Preparation of modified polyol: Modified polyol components are obtained by high-speed dispersion and mixing of nanoparticles with an average particle size of 20-80 nm, surface-modified with silane coupling agent, and polycaprolactone polyol; S2: Synthesis and degassing of prepolymer: The modified polyol components are reacted with diphenylmethane diisocyanate to obtain a prepolymer with a terminal isocyanate group content of 5-12 wt%, resulting in a uniform micropore size distribution of 50-250 μm, density fluctuation ≤ ±0.02 g / cm³, compression set controlled within 8%, and dynamic fatigue life exceeding 2 million cycles, thus solving the problems of poor microporous structure uniformity, high compression set, and insufficient fatigue life.

The application discloses an antistatic dustproof light and thin polyurethane coating and application thereof in textiles, and relates to the coating technical field.The coating is prepared from the following raw materials in parts by weight: 70-80 parts of water-based polyurethane, 5-10 parts of an antistatic agent, 2-5 parts of a film-forming aid, 0.5-1 part of a dispersing agent, 5-8 parts of a hydrophilic aliphatic polyisocyanate, and 20-30 parts of deionized water.The antistatic dustproof light and thin polyurethane coating prepared by the application has good dustproof property, antistatic property and leveling property.

The invention relates to the technical field of high polymer material preparation, and discloses a supercritical fluid assisted TPU foaming and irradiation crosslinking integrated process which comprises the following steps: melting and plasticizing thermoplastic polyurethane particles, anti-irradiation master batch and an inorganic nucleating agent in extrusion equipment to obtain a polymer melt; injecting a supercritical fluid into the polymer melt to enable the polymer melt to be diffused among molecular chains to form a swollen melt; introducing the swollen melt into a depth-controlled flat runner, and carrying out online irradiation by using electron beams in a state of applying back pressure higher than saturated vapor pressure; and extruding the cross-linked melt to release pressure and carrying out foaming growth. According to the invention, through the cooperation of swelling state online irradiation and flat runner back pressure control, the problems that the foaming ratio is limited by solid pre-irradiation and the core cross-linking of a thick product is insufficient are solved, so that the synchronous regulation and control of a cross-linked network and cell growth are realized, and the TPU foaming material with light weight and uniform cells is obtained.

This invention relates to the field of electrochemical energy storage materials and lithium metal battery technology, specifically to an in-situ polymerized solid electrolyte, its preparation method and application, and lithium metal batteries. This in-situ polymerized solid electrolyte is prepared by heating a ring-opening polymerization reaction using 1,3-dioxolane and 1,1,1-trifluoro-2,3-epoxypropane as reactants, sodium thiosulfate as an initiator, and lithium salt and plasticizer fluoroethylene carbonate as a precursor solution. This electrolyte possesses numerous amorphous regions, which is beneficial for ion transport, enabling the formation of a self-supporting dense structure. It also ensures close contact with the electrode, resulting in a pure interface that effectively reduces interfacial impedance and avoids side reactions at the electrode interface. Furthermore, it enhances oxidation resistance, broadens the electrochemical window, and inhibits dendrite growth. While achieving good mechanical properties, it also improves the cycle stability and safety performance of the battery. It has excellent application prospects in lithium metal batteries, lithium-ion batteries, solid-state energy storage systems, or flexible electronic devices.