A kind of flame-retardant polyurethane material and preparation method thereof
A polyurethane material and flame retardant technology, which is applied in the field of flame retardant polyurethane material and its preparation, can solve the problems of compound flame retardant materials, such as the influence of mechanical properties, large addition amount, and poor compatibility, so as to improve flame retardancy, Effect of improving compatibility and improving dispersibility
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[0030] A preparation method of a flame-retardant polyurethane material, comprising the following steps: adding expandable graphite, ammonium polyphosphate and phytic acid-modified graphene oxide into polyether polyol, stirring uniformly, then adding isocyanate, stirring uniformly, After the foaming is completed, it is cured at room temperature.
[0031] The formulas of polyether polyol, isocyanate, expandable graphite (EG), ammonium polyphosphate (APP), phytic acid-modified graphene oxide (fGO-p) and graphene oxide (GO) by weight are shown in Table 1.
[0032] Table 1 The formula and limiting oxygen index of polyurethane materials
[0033]
[0034] The weight ratio of EG and APP can be 1:1, 2:1, 3:1 or 4:1, but the limiting oxygen index is highest when EG / APP=3:1. It can be seen from Example 4 and Comparative Examples 2 and 3 that the modified GO exhibits better flame retardancy and its LOI value is 26.5%, which is higher than 25.9% of the unmodified GO.
[0035] Embodime...
Embodiment 7
[0045] The modified graphene oxide is octadecylamine-modified graphene oxide (fGO-o), and the octadecylamine-modified graphene oxide is prepared by the following method: 2g octadecylamine is ultrasonically dissolved in 100ml In the aqueous solution of 95% (volume fraction) ethanol, solution A was obtained; 2g graphite oxide powder was ultrasonically dispersed in 100ml of deionized water to obtain solution B; then solution A was poured into a three-necked flask, added to solution B, Under magnetic stirring, the condensed water was turned on, and the reaction was refluxed in an oil bath at 100 °C for 20 h, and centrifuged, washed and dried to obtain octadecylamine-modified graphene oxide.
[0046] A kind of flame retardant polyurethane material, the formula of raw materials by weight is shown in Table 2.
[0047] Table 2 Polyurethane composite material formula and its corresponding limiting oxygen index
[0048]
[0049] It can be seen from Table 2 that, compared with the ad...
Embodiment 8
[0053] The modified graphene oxide is IPDI-modified graphene oxide (fGO-i), and the IPDI-modified graphene oxide is prepared by the following method: ultrasonically dispersing 2 g graphene oxide in 100 ml of DMF solution, and then dripping with a glue tip Add 5 drops of dibutyltin dilaurate DBTDL dropwise to the tube, and finally add 2 ml of IPDI, under the condition of constant temperature of 90 °C, stir and react for 22 h, filter, wash and dry.
[0054] A preparation method of a flame retardant polyurethane material, the formula in parts by weight of raw materials is shown in Table 3.
[0055]
[0056]
[0057] After modification, because the surface of FGO has unreacted isocyanate groups, it can participate in the foaming reaction of polyurethane, and it can be better compatible with the polyurethane matrix, which improves the defect that GO is easy to agglomerate and increases the defects in the polyurethane foam structure.
[0058] like Figure 7 and 8 As shown, t...
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