Flame-retardant polyurethane rigid foam and preparation method thereof
A rigid foam and flame-retardant technology, which is applied in the field of flame-retardant polyurethane rigid foam and its preparation, can solve the problem of reducing the mechanical properties of flame-retardant polyurethane rigid foam, the inability to achieve high-efficiency flame retardancy, and low flame retardancy, etc. problems, to achieve the effects of reducing heat release rate and smoke production, avoiding poor compatibility, and improving mechanical properties
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[0036] figure 1 It is a method flow chart of a preparation method of a flame-retardant polyurethane rigid foam shown according to an exemplary embodiment, such as figure 1 As shown, the method includes:
[0037] Step 100: Prepare a mixed acid according to the mass ratio of sulfuric acid and boric acid at 3:1, put expandable graphite into the mixed acid and ultrasonically mix for 1 hour, then stir and react at a reaction temperature of 80°C for 2 hours, and then The reaction product was filtered out, washed and dried to obtain modified expandable graphite, and the mass concentration of the expandable graphite in the mixed acid was 0.1 g / L.
[0038] Step 200: Soak the aramid fibers in acetone for 2 hours, take them out, wash and dry the aramid fibers with deionized water, and put the dried aramid fibers into a phosphoric acid solution for ultrasonic treatment for 1 hour Then take it out, and then put it into an oven at 130° C. for baking for 5 minutes, and use deionized water ...
Embodiment 1
[0054] Step 1: Configure the mixed acid according to the mass ratio of sulfuric acid and boric acid as 3:1, send the expandable graphite into the mixed acid and ultrasonically mix for 1 hour, then stir the reaction for 2 hours at a reaction temperature of 80°C, and then place the The reaction product was filtered out, washed and dried to obtain modified expandable graphite, and the mass concentration of the expandable graphite in the mixed acid was 0.1 g / L.
[0055] Step 2: Soak the aramid fibers in acetone for 2 hours, take them out, wash and dry the aramid fibers with deionized water, and put the dried aramid fibers into a phosphoric acid solution for ultrasonic treatment for 1 hour Then take it out, and then put it into an oven at 130° C. for baking for 5 minutes, and use deionized water to wash, dry and dry the baked aramid fibers to obtain phosphoric acid modified aramid fibers.
[0056] Step 3: Configure a silane coupling agent solution with a solute concentration of 3wt...
Embodiment 2
[0066] Step 1: According to the weight ratio of bio-based polyol:foam stabilizer:catalyst:foaming agent:isocyanate 100:1.5:0.4~0.6:25:100, carry out accurate weighing in turn and send it into the blending container to form a mixture. Then, after using a constant speed stirrer to uniformly stir the mixture in the blending vessel for 15 s, the mixture was placed into a mold with a temperature of 45° C., and the stirring speed of the constant speed stirrer was 1000 r / min.
[0067] Step 2: put the mold and the mixture together into an electric blast drying oven with a drying temperature of 60° C., foam and solidify for 30 minutes, take it out, and obtain a pure polyurethane rigid foam after cooling and demoulding.
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