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Effect of Nano-flame Retardant on Oxygen Index of Plastic-wood Composite Material

Plastic-wood composite materials as a new type of material, the performance fully reflects the advantages of wood and plastic, and does not contain formaldehyde, widely used in outdoor construction materials abroad. Since both thermoplastics and wood fibers are hydrocarbons, which are easy to burn in the event of an open flame or in the case of heating, WPC is a flammable composite material and generates a large amount of harmful gases during the combustion process, thus limiting the Its use range, so it is often necessary to add flame retardants in the production process. Flame retardancy of wood-plastic composites involves flame retardation of wood components and flame retardance of polymers. Flame-retardant polyolefins and woods often use inorganic flame retardants (aluminum hydroxide, magnesium hydroxide, etc.), halogen-containing flame retardants (decabromodiphenyl ether, etc.) and phosphorus-containing flame retardants (ammonium polyphosphate, phosphate esters). Etc., etc.) Among them, inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide have attracted attention because of their low price, excellent thermal stability, and their non-toxic and smoke-suppressing properties.

experiment material

The wood shavings species are mainly Yunnan pine and eucalyptus, with an initial moisture content of 5.8%. High-density polyethylene (HDPE) pellets with a density of 0.941 g/cm3 to 0.960 g/cm3. Industrial grade silane coupling agent. Decomposition temperature 350 °C. Nano-aluminum hydroxide (nano-ATH), 50-60 nm in the minor axis and 300-400 nm in the major axis. Analysis of pure non-nano-aluminum hydroxide (non-nano-ATH).

equipment

Oxygen index tester, plastic-wood composite material preparation.

The plastic-wood ratio of plastic-wood composite materials is 6:4, and the amount of silane coupling agent is 2%. The plastic, shavings, and the coupling agent fire retardant were thoroughly mixed on the side of the stirrer and manually laid into a loose slab of 305 mm x 350 mm. The pre-compression is performed at room temperature (pre-pressing pressure is 1 MPa and pre-pressing time is 30 s), and then hot pressing is performed in an eight-platen vulcanizer. The nominal density of plastic composites was set at 0.89/cm3 and the nominal thickness was 10xma. The main hot pressing parameters; hot pressing temperature 180 °C. Hot pressing time 12rain, hot pressing pressure 2MPa.

Performance Testing

The Oxygen Index of plastic-wood composite materials was tested according to GB/T2406-1993. The mechanical properties of plastic-wood composite materials were tested in accordance with the test method for physical and chemical properties of artificial panels and decorative panels GB/T17657.1999.

Effect of Flame Retardant Types on WPc Oxygen Index.

Figure 1 uses five flame retardants, where l represents nano-MH, II represents nano-ATH, III represents non-nano-ATH, IV represents nano-ATH+nano-MH (ratio 1:1), and V represents nano-ATn+non-nano-ATH (compared to inverted 1:1), the amount of flame retardant is 12%.

Nano-flame retardants have better flame-retardant properties than non-nano-flame retardants; nano-MH and ATH alone are slightly better than nano-MH; nano-MH and nano-ATH are used in combination to produce synergistic effects; nano- and non-nano The ATH is used in mixed stations to produce anti-synergistic effects. This is because the nanoparticles are small and have a large specific surface area, plus the size effect and surface effect of the nanoparticles themselves. The contact area between the flame retardant and the matrix was increased, the interaction and affinity between the flame retardant and the matrix were enhanced, and the compatibility between the two was improved; the heat absorbed by MH and ATH was 1.42 MJ/kg, 1.2 respectively. MJ/kg, and MH's high thermal decomposition temperature, theoretically should be better than nano-MH MH flame retardant effect is better, but this experiment appears that nano-ATH is slightly better than nano-MH, this is because the two are not the same company products Although it is all nano-sized, there are differences in size, which affects its flame-retardant effect.


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