Abstract: This disclosure provides high-efficiency and low-energy-consumption synthetic methods of a series of phosphorus-nitrogen-based intumescent flame retardants and the use thereof in paint flame retarding. 1 part by weight of a phosphorization agent and 0.5-4.0 parts by weight of a nitrogen-containing foaming agent are uniformly mixed and stirred at room temperature, and an amount of water is further added to emit heat and initiate reaction. 0.5-3.0 parts by weight of a charring agent and 0.5-4.0 parts by weight of a hydroxy-containing polyfuctional crosslinking agent are then added, and reacted with stirring. An amine compound is finally added for neutralization until pH value is 5-8, and solid liquid separation is performed. The solid portion is dried to obtain a main body portion of a phosphorus-nitrogen-based intumescent flame retardant. The resultant filtrate is diluted with ?-? volume of water, and a flame retardant product is obtained.

Abstract: The application proposes a distributed solar energy concentrating and splitting utilization system, comprising N concentrating and splitting optical modules, each of the concentrating and splitting modules comprising of a condensing mechanism, a splitting mechanism and a photovoltaic power generating device, wherein the splitting mechanism is located at the spotlight. The light receiving surface of the light condensing mechanism and the light receiving surface of the light splitting mechanism are oppositely arranged. The light splitting film is arranged on the light receiving surface of the light splitting mechanism, and a light transmitting hole is arranged on the light condensing mechanism for collecting sunlight and irradiating the light splitting mechanism.