WANG GUANGKAILIN XIAODANYANG BINGFAN ZHISHA
UNIV SOUTH CHINA TECHWANG GUANGKAILIN XIAODANYANG BINGFAN ZHISHA
The present invention relates to a halogen-free flame retardant containing benzoxazine and a polymer material containing a halogen-free flame retardant. A small amount of metal oxide or hydrate may be added as a flame retardant synergist. Phosphorus oxide,phosphoric acid, metaphosphoric acid, polyphosphoric acid generated from combustion of red phosphorus reacts with a large number of phenolic hydroxyls generated in curing of benzoxazine resin, and the product is dehydrated to form a inorganic-organic hybridized blocking layer. The blocking layer has a good wettability on a base polymer, and the blocking performance is improved, and at the same time, the organic portion has an absorption effect on the organic flue gas, so that the flame retardant efficiency is significantly improved. The small amount of metal oxide or hydrate can enhance the stability of the blocking layer, thereby further improving the flame retardant effect. The composition is useful for flame retarding of the polymer and polymer-based composition and products thereof, and has a good flame retardant effect. The halogen-free flame retardant system according to the present invention has the advantages of low cost, wide range of application and good flame retardance.
ECOCEAN CO LTD;ECOCEAN CO.;LTD.;KOREA OCEAN RES DEV INST;E & C TECHNOLOGY INST;KOREA OCEAN RESEARCH AND DEVELOPMENT INSTITUTE;E&C TECHNOLOGY INSTITUTE
A device for measuring the quantity of material flown in seawater is provided to accurately measure the quantity of material flown in the seawater from surface sediment by circulating the seawater flown in a parallel direction for uniformly contacting the whole surface of the collected sediment with the seawater. The device comprises: a housing which includes a supply portion(12) through which seawater is supplied, a receiving portion(14) to receive collected sample, discharge portions(16), each of which is formed in sequence by each partition installed at bottom with predetermined height and a cover tool(20) to open and close open upper portion; a circulation pump which supplies the seawater of the discharge portion to the supply portion to compulsorily circulate the seawater, thereby flowing in a parallel direction in the receiving portion; and material measurement sensors which are equipped at the discharge side to measure the quantity of surface sediment flown in the seawater when the seawater passes through the receiving portion in parallel. The device further comprises a collecting tool including a collecting frame(40) which has an open bottom side and through holes at both sides and a lower cover(44) to close the lower portion of the collection frame when the sample is received in the collection frame.