38results about How to "Improve poor compatibility" patented technology

The invention discloses a preparation method of large-particle size melamine cyanurate. The preparation method comprises the following steps: (1) uniformly mixing melamine and cyanuric acid, adding water, heating, keeping temperature, and removing moisture; (2) carrying out prepolymerization reaction on caprolactam and a catalyst, then adding a cocatalyst, and uniformly mixing; and (3) adding a prepolymer obtained from the step (2) to a system obtained from the step (1) for polymerization reaction, after the polymerization reaction is finished, cooling, and discharging. MCA prepared through the method disclosed by the invention has large particle size, is coated with nylon 6 on a surface and can be used for improving the problem of poor compatibility of the MCA and a matrix when applied to plastic modification and nylon modification especially. The preparation method disclosed by the invention is green and environment-friendly. The MCA can reduce the phenomenon of dust reduction by being taken as a raw material of downstream plastic processing.

The invention belongs to the field of polymer additives, and in particular relates to an amphiphilic comb-like composite polymer light stabilizer and a preparation method thereof. The molecular side chain of the composite polymer light stabilizer contains benzophenone UV absorber functional group, hindered amine free radical scavenger group, lipophilic group acrylate and hydrophilic group polyethylene glycol. Alcohol monomethyl ether molecular chain, etc. Because the light stabilizer of the present invention contains two functional monomers, an ultraviolet absorber and a free radical scavenger, it has a double light-stabilizing effect, has a high thermal decomposition temperature, and is amphiphilic, so it is especially suitable for the production of wood-plastic composite materials. Light stabilization, the synthesis of the light stabilizer adopts free radical solution polymerization, the preparation method is simple, and it is suitable for industrial production.

The invention discloses an epoxy nanocomposite based on polyhedral oligomeric silsesquioxanes (POSS) and a preparation method of the epoxy nanocomposite based on the POSS and relates to the epoxy nanocomposite with a controllable phase structure capable of improving effect and based on the POSS. The preparation method includes the following steps of allocating a POSS monomer, a chain transfer agent and an initiating agent in a solution according to the measuring amount through a reversible addition-fragmentation chain transfer (RAFT) method, conducting freeze thaw and degassing through liquid nitrogen, charging argon shield to enable the mixture to react, and obtaining PMAiBuPOSS; further allocating PMAiBuPOSS, Methl Methacrylate monomer (MMA) and an initiating agent in a solution, and obtaining POSS base block copolymer , namely, PMAiBuPOSS-b-PMMA, through the RAFT; conducting melt blending on the POSS monomer, epoxy resin, the prepared POSS base block copolymer to obtain blend precursor of the POSS and the epoxy, adding in a curing agent, fully stirring, dissolving the mixture the curing agent, pouring the blend into a die, conducting temperature programming and curing, and obtaining the nanocomposite with the controllable phase structure and based on the POSS.

The invention belongs to the technical field of modified asphalt, and in particular relates to a polystyrene hybrid material modified asphalt and a preparation method thereof. The polystyrene hybrid material is a polystyrene silicon dioxide hybrid material, based on the weight of the base asphalt, and its dosage is 1-8wt%. Compared with the prior art, the present invention has the following advantages: the problem of poor compatibility between polystyrene and asphalt is improved; first, the hybrid material is ultrasonically dispersed in a solvent, and then blended with the base asphalt, and the solvent is mixed during the mixing process. Volatilization can ensure the modification effect of polystyrene hybrid materials; during the preparation of modified asphalt, the preparation temperature is low, only 100‑130 ° C, while the conventional preparation temperature of polystyrene modified asphalt is about 180 ° C, Save energy, prevent severe asphalt aging, and ensure that the modified asphalt has good performance; compared with ordinary polystyrene modified asphalt mixture, the prepared asphalt mixture has significantly improved high and low temperature performance.

The invention discloses an ABS (Acrylonitrile Butadiene Styrene) / POM (Polyoxymethylene) alloy and a preparation method thereof. The ABS / POM alloy comprises the following components by weight percent: 65-80 percent of POM, 0.1-0.5 percent of long-chain carboxylic acid calcium salt, 8-20 percent of ABS, 0.1-1 percent of melamine urate, 4-9 percent of compatilizer, 5-16 percent of flexibilizer, 0.1-1 percent of antioxygen and 0.1-5 percent of lubricant, wherein the compatilizer is compounded by ABS grafted maleic anhydride and SEBS grafted maleic anhydride; and the flexibilizer is thermoplastic polyurethane elastomer. The compatibility of POM and ABS is improved through compounding the ABS grafted maleic anhydride and the SEBS grafted maleic anhydride, and the impact property of the alloy is further improved by adopting the polyurethane elastomer as the flexibilizer.

The invention discloses a sound-insulating and noise-reducing, flame-retardant polypropylene material and a preparation method thereof. It is prepared from components including 20-60 parts by weight of polypropylene, 5-30 parts of modified basalt fiber, preferably 15-20 parts 2-30 parts, 2-30 parts of modified boehmite, preferably 5-10 parts, 0.5-1 part of antioxidant. The polypropylene material obtained by the invention has good sound insulation effect and flame retardant effect, and can be widely used in materials such as home appliances and automobile interior decorations.

Provided are a method and device for loading a digital certificate in SSL or TLS communication. The method comprises: receiving a handshake request message sent by a client based on a secure sockets layer (SSL) or transport layer security (TLS); according to the handshake request message, verifying a key exchange mode and a first signature mode supported by the client; judging whether the key exchange mode and the first signature mode match a currently loaded digital certificate; if not, loading another digital certificate matching the key exchange mode and the first signature mode; and according to the key exchange mode and the first signature mode successfully matching the digital certificate, returning a handshake response message to the client.The embodiments of the present application achieve dynamic loading of a suitable digital certificate in a handshake negotiation process, thereby ensuring successful completion of SSL / TLS handshake negotiation.

The invention relates to the technical field of construction materials, and particularly relates to conductive concrete and a preparation method thereof. The conductive concrete comprises the following component: 1-10 parts of carbon-coated stainless steel fiber, 10-30 parts of 5R compound silicate cement, 10-30 parts of standard river sand, 1-5 parts of silica fume, 0.1-5 parts of methyl cellulose, 0.1-3 parts of polyether defoaming agent GPE, 5-30 parts of deionized water and 2-8 parts of gravel. The folding strength and compression strength of the concrete provided by the invention can reach the best levels of the prior art, and the resistivity is far superior to the existing level; and no expensive equipment is needed, the process flow is simple, and the production cost is low, thereby ensuring that the invention is more suitable for popularization.

The invention discloses a steam-cured cement-based material with high water absorption resistance, which is added with a phase-change composite material with diatomite-coated expanded graphite and paraffin adsorbed in the pores of the diatomite and the expanded graphite. The steam-cured cement-based material of the present invention is added with a phase-change composite material whose structure is diatomite-coated expanded graphite and paraffin is adsorbed in the pores of diatomite and expanded graphite. Under the premise of poor performance and significant negative effect on the mechanical properties of cement-based materials, it can significantly improve the water adsorption resistance of steam-cured cement-based materials, improve the durability of steam-cured cement-based materials, and enhance the structural service life of steam-cured concrete.