3 results about "Organophosphorous compounds" patented technology

The present invention relates to a process of hydrogenating an alkyne selectively to an alkene by hydrogen using a hydrogenation catalyst which is palladium supported on a carrier in the presence of an additive mixture of an organic phosphorus compound (AP) and an organic sulphur compound (AS).

This invention belongs to the field of flame retardant technology, specifically a novel halogen-free phosphorus-nitrogen synergistic flame retardant for optical cable materials. By weight, it comprises: 35-50 parts of a phosphorus-based flame retardant main agent, 25-40 parts of a nitrogen-based flame retardant main agent, 5-15 parts of a synergistic enhancer, 3-8 parts of a compatibility modifier, 2-5 parts of an anti-exudation agent, and 1-3 parts of a heat stabilizer; the phosphorus-based flame retardant main agent is a compound of halogen-free organophosphorus compounds and inorganic phosphorus compounds; the nitrogen-based flame retardant main agent is a compound of melamine derivatives and low-free-formaldehyde urea-formaldehyde resin; and the synergistic enhancer is a compound of nano-magnesium hydroxide and organically modified montmorillonite. The flame retardant of this invention is halogen-free and environmentally friendly, complies with international and domestic environmental regulations, has high flame retardant efficiency, and can achieve UL94 V-0 rating for optical cable materials with an addition of 15%-20%. It also has good compatibility with optical cable material substrates, excellent thermal stability, and controllable cost, making it suitable for large-scale industrial production. It can be widely used in the flame retardant modification of optical cable sheaths and insulation layers in densely populated indoor places such as office buildings and residences.

The application provides a flame-retardant PMMA resin suitable for a molding process, a fiber-reinforced flame-retardant PMMA resin composite and a preparation method thereof, and belongs to the technical field of high polymer flame-retardant materials.The flame-retardant PMMA resin is prepared from raw materials including the following components by weight: MMA slurry 30-85 parts, monomer copolymerizable with MMA 1-15 parts, surface-modified hydroxide 10-60 parts, organic phosphorus compound 5-15 parts, melamine and derivatives thereof 5-15 parts, surface-modified ammonium polyphosphate 5-20 parts, and initiator 0.1-4 parts.The flame-retardant PMMA resin and the composite prepared by the application have excellent flame-retardant function and good mechanical properties.