Preparation method for dihydric alcohol used for preparing polyurethane and application of dihydric alcohol
A diol and polyurethane technology, which is applied in the field of the preparation of recycled PET-based bromine-containing synergistic flame-retardant diols, can solve the problems of life and property safety hazards, and polyurethane is easy to burn, so as to increase the added value of products and increase flame retardancy Sex, technology mature and reliable effect
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Embodiment 1
[0045] Embodiment 1 A kind of preparation method for the dihydric alcohol of polyurethane
[0046] (1) Add 100g of recycled broken polyethylene terephthalate and 80g of glycol glycol into the reaction kettle, turn on the agitator, add 0.2g of zinc acetate catalyst, heat to 210°C, and keep it warm for 1h to obtain PET base glycol;
[0047] (2) Cool the temperature to 120°C, add 100g of tetrabromophthalic anhydride, and react for 10 minutes until the tetrabromophthalic anhydride dissolves;
[0048](3) Add 100g of propylene oxide, 1.0g of quaternary ammonium salt catalyst tetraethylammonium bromide, react for 3h, cool, and discharge to obtain the diol used for preparing polyurethane; it is a light yellow transparent liquid with an acid value of 0.9mgKOH / g, the viscosity is 3110mPa.s.
Embodiment 2
[0049] Embodiment 2 A kind of preparation method for the dibasic alcohol of polyurethane
[0050] (1) Add 100g of recovered crushed polyethylene terephthalate and 90g of diol 1,3-propanediol to the reaction kettle, turn on the agitator, add 0.3 zinc acetate catalyst, heat to 220°C, and keep it warm for 2h to obtain PET-based diols;
[0051] (2) Cool the temperature to 120-130°C, add 160g of tetrabromophthalic anhydride, and react for 20 minutes;
[0052] (3) Add 120g of epichlorohydrin and 2.2g of quaternary ammonium salt catalyst benzyltriethylammonium chloride, react for 3h, cool, and discharge to obtain diol for preparing polyurethane; it is light yellow transparent liquid, The acid value is 0.5mgKOH / g, and the viscosity is 4635mPa.s.
Embodiment 3
[0053] Embodiment 3 A kind of preparation method for the dihydric alcohol of polyurethane
[0054] The steps are the same as in Example 2, except that diethylene glycol is used instead of 1,3-propanediol; cetyltrimethylammonium bromide is used instead of benzyltriethylammonium chloride.
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