178results about How to "Prevent secondary combustion" patented technology

The invention discloses a cooling method for a hot gas dispersoid fire-extinguishing device. The method is applied to the hot gas dispersoid fire-extinguishing device. The hot gas dispersoid fire-extinguishing device comprises a box body (1); a reaction barrel (3) filled with a hot gas dispersoid generating medicament (2) is arranged in the box body (1); and one side of the box body (1) is provided with a gas outlet (4). The method comprises the following steps of: improving the structure of the hot gas dispersoid fire-extinguishing device to realize physical cooling; and improving components and ratio of a chemical agent to realize chemical cooling. By improving the structure of the hot gas dispersoid fire-extinguishing device and the formula of the cooling agent, the temperature of a gas dispersoid passing through a nozzle is effectively reduced and the cooling effect is ideal; moreover, the cooling method is nontoxic and harmless, and has excellent safety and social benefit.

The invention discloses a toughened halogen-free flame-retardant polylactic acid blending material which is prepared by melting and blending the following components in percentage by weight: 40-93 percent of polylactic acid, 1-40 percent of toughener, 5-30 percent of flame retardant, 0-30 percent of auxiliary flame retardant and 0.5-1 percent of antioxidant. Because the toughener is also introduced into the polylactic acid blending material on the basis of adding a halogen-free flame retardant, the material has excellent flame retardant performance and also markedly improves the toughness of the polylactic acid simultaneously, thereby not only enlarging the use range of the material, but also solving the two great problems of easy combustion and poor toughness of the polylactic acid simultaneously.

The invention belongs to the high molecular material modification technical field, and in particular relates to a preparation method of natural fiber / poly lactic acid composite material with fire-retarding performance. The preparation method comprises the following steps: the surface modification and the fire-retarding modification of natural fiber are completed to improve the interface combination degree and the fire-retarding performance between the natural fiber and a poly lactic acid matrix; and then, the modified natural fiber is combined with poly lactic acid and fire retardant, therebyobtaining natural fiber-reinforced poly lactic acid composite material with excellent fire-retarding performance, mechanical property and full biodegradation. The poly lactic acid composite material,which can pass the fire-retarding testing in accordance with the standards of Federal Aviation Administration (FAA) and UL94V-O grade testing, can be used in fields such as airplane, automobile and electronic industry, which have strict requirements on material fire-retarding performance and mechanical property.

The invention relates to a triazine macromolecular halogen-free flame-retardant char-forming agent compound and a preparation method thereof. The structure of the compound is as shown in the description, wherein n is larger than 1, X is alcohol amine, and Y is dialkylamine. The preparation method comprises the steps that under the stirring condition, an equimolar amount of alcohol amine is added into a solution of triglycidyl isocyanurate, the temperature is increased to a certain value, and heat preservation reaction is conducted for a period of time to enable the pH of the solution to range from 7 to 8; a certain molar of dialkylamine is added, the temperature is increased to a certain value, and heat preservation reaction is conducted for a period of time to enable the pH of the solution to range from 7 to 8; cooling is conducted, suction filtration (recycling of solvent), water washing, drying and smashing are conducted, and the triazine macromolecular flame-retardant char-forming agent product is obtained. The triazine macromolecular halogen-free flame-retardant char-forming agent is an excellent flame-retardant char-forming agent, has a char-forming anti-dropping effect, is good in compatibility with high molecular materials and excellent in processability and can be used as the flame-retardant char-forming agent of materials such as polyethylene (PE), polypropylene (PP) and silicone rubber; the raw materials of the char-forming agent are low in price and easy to obtain, the production cost is low, the equipment investment is low, the production technology is simple, and scale production is easy.

The invention relates to a process for preparing a polyvinyl chloride cable material, and the process comprises the following steps: 1, adding PVC resin with the degree of polymerization of 1300, SG3 type PVC resin, cyclohexane-1,2-dinonyl diformate, acetyl butyl octyl citrate and white carbon black into a high-speed kneading machine for high-speed kneading for 3 to 5 minutes to reach temperature of 90 to 100 DEG C; 2, performing low-speed kneading for 1 minute, simultaneously pouring antimony trioxide, zinc borate, a filler, aluminum hydroxide, a calcium zinc heat stabilizer, antioxidant 1010, a lubricant, processing modifier P551J, an inorganic silicate deodorant and white carbon black, then performing high-speed kneading for 6 minutes, and when the temperature reaches 120 DEG C, fully mixing evenly, pre plasticizing, and discharging; and 3, when in extrusion, screw temperature of double screws being 120 DEG C to 150 C. The process greatly improves the flame retardant property of the material, and the material has good carbon forming effect during combustion, so that secondary combustion and flame propagation of the material can be prevented.

The invention relates to a tris[2-(dimethylthioPEPAoxysilyloxy)ethyl] isocyanurate compound and a preparation method thereof. The structure of the compound is shown in the following formula: the preparation method is: Dissolve tris(2-hydroxyethyl)isocyanurate in an organic solvent, add dimethyldihalosilane which is 3 times molar relative to tris(2-hydroxyethyl)isocyanurate, and heat up to 50°C ~70°C, keep warm for 5~9h; cool down to below 30°C, add a certain mole of SPEPA, heat up to 70°C~100°C, keep warm for 6~14h; after purification, tris[2‑(2 MethylthioPEPAoxysilyloxy)ethyl] ester. The flame retardant of the invention has high flame retardant efficiency and good char formation performance, is suitable for use as a flame retardant for polyolefin, polyester, epoxy resin, unsaturated resin, etc., has simple production process, low cost, and is easy to realize industrialized production.