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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 large addition amount, impact on mechanical properties of compound flame retardant materials, and poor compatibility, so as to improve dispersion and reduce The total amount of heat released and the effect of improving flame retardancy

Active Publication Date: 2021-01-15
NORTH CHINA INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the compound use of EG and other flame retardants can improve the flame retardancy, the large amount of addition and poor compatibility with polymers will also greatly affect the mechanical properties of the compound flame retardant materials.

Method used

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  • Flame-retardant polyurethane material and preparation method thereof
  • Flame-retardant polyurethane material and preparation method thereof
  • Flame-retardant polyurethane material and preparation method thereof

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preparation example Construction

[0030] A method for preparing a flame-retardant polyurethane material, comprising the following steps: adding expandable graphite, ammonium polyphosphate and phytic acid-modified graphene oxide into polyether polyol, stirring evenly, then adding isocyanate, stirring evenly, After foaming, it is cured at room temperature.

[0031] Polyether polyol, isocyanate, expandable graphite (EG), ammonium polyphosphate (APP), phytic acid modified graphene oxide (fGO-p) and graphene oxide (GO) are shown in Table 1.

[0032] Formulation and limiting oxygen index of table 1 polyurethane material

[0033]

[0034] The weight ratio of EG and APP can be 1:1, 2:1, 3:1 or 4:1, but when EG / APP=3:1, the limiting oxygen index is the highest. From Example 4, Comparative Examples 2 and 3, it can be seen that the modified GO has better flame retardancy and its LOI value is 26.5%, which is higher than 25.9% of the unmodified GO.

[0035] Embodiment four, comparative examples one to three are tested...

Embodiment 7

[0045] Modified graphene oxide is octadecylamine-modified graphene oxide (fGO-o), and 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, obtain solution A; Ultrasonic disperse 2g graphite oxide powder in the deionized water of 100ml, obtain solution B; Then solution A is poured in the there-necked flask, joins in the solution B, Open the condensed water under magnetic stirring, reflux reaction in an oil bath at 100° C. for 20 h, centrifuge, wash and dry, and obtain octadecylamine-modified graphene oxide.

[0046] A kind of flame-retardant polyurethane material, the formula of raw material parts 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 addition of GO, the addition of FGO can increa...

Embodiment 8

[0053] Modified graphene oxide is IPDI-modified graphene oxide (fGO-i), and the IPDI-modified graphene oxide is prepared by the following method: 2g graphene oxide is ultrasonically dispersed in 100ml of DMF solution, and then dripped with a glue head Add 5 drops of dibutyltin dilaurate (DBTDL) dropwise to the tube, and finally add 2ml of IPDI, stir and react for 22 hours at a constant temperature of 90°C, then filter, wash and dry.

[0054] A method for preparing a flame-retardant polyurethane material, the formula of which is shown in Table 3 in parts by weight of raw materials.

[0055]

[0056]

[0057] After modification, because the surface of FGO has unreacted isocyanate groups, it can participate in the foaming reaction of polyurethane, and can be better compatible with the polyurethane matrix, which improves the defect that GO is easy to agglomerate and increases the number of defects in the polyurethane foam structure.

[0058] like Figure 7 and 8 As shown, ...

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Abstract

The invention provides a flame-retardant polyurethane material and a preparation method thereof. The flame-retardant polyurethane material is prepared from the following raw materials in parts by weight: 22 parts of polyether polyol, 22 parts of isocyanate, 6 parts of expandable graphite and ammonium polyphosphate and 0.05-0.25 parts of modified graphene oxide. The modified graphene oxide is phytic acid modified graphene oxide, octadecylamine modified graphene oxide or isophorone diisocyanate (IPDI) modified graphene oxide. Graphene oxide is modified, the dispersity and compatibility of graphene oxide in a base material are improved, meanwhile, expandable graphite and ammonium polyphosphate cooperate to form a more compact and perfect carbon layer, and the flame retardance of the materialis improved.

Description

technical field [0001] The invention relates to the technical field of polyurethane material preparation, in particular to a flame-retardant polyurethane material and a preparation method thereof. Background technique [0002] The synthetic raw materials of polyurethane foam are polyether polyol and isocyanate. The multi-bubble structure of polyurethane foam increases the contact area between the polymer skeleton and oxygen in the air, which makes polyurethane extremely flammable and the flame spreads quickly. Therefore, in When using polyurethane materials, it should be modified first to improve its thermal properties, and to develop new, environmentally friendly flame-retardant rigid polyurethane foam materials, so that it is not easy to be ignited in the event of a fire, thereby reducing potential safety hazards. Generate huge economic and social benefits. [0003] Expandable graphite (EG) is a green and environmentally friendly inorganic intumescent flame retardant, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08K13/06C08K3/32C08K9/04C08K3/04C08K9/00
CPCC08G18/48C08K13/06C08K3/32C08K9/04C08K3/042C08K9/00C08K3/04C08K2003/323
Inventor 周旋高明
Owner NORTH CHINA INST OF SCI & TECH
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