Low-heat-release quick-release combined polyether, B1-grade flame-retardant polyurethane block foam derived from low-heat-release quick-release combined polyether and preparation method of B1-grade flame-retardant polyurethane block foam
A technology of combining polyether and low exotherm, applied in the field of polyurethane, can solve the problem that block foam is prone to core burning, and achieve the effects of improving temperature resistance, improving mold release and improving production efficiency
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[0071] In yet another aspect, the present application also provides a method for preparing low-exothermic, quick-release B1-grade polyurethane block, which includes the following steps: adding isocyanate into the container in proportion, and after mixing the combined polyether uniformly, Pour it into a mold preheated at 35-40°C, then pull it into a drying room at 50-60°C for curing for a period of time, and then put it in a constant temperature room at 20-30°C for further curing to obtain polyurethane block foam for LNG. In some embodiments, the mass ratio of combined polyether and isocyanate is 1:1.6˜1.8.
[0072] In some embodiments, the isocyanate is high-viscosity liquefied MDI, the model is Suprasec 5008, the viscosity is 650mpa.s, and the -NCO content is 30%, purchased from Huntsman Polyurethane (China) Co., Ltd.
[0073] In some embodiments, the mold temperature ranges from 50°C to 60°C.
[0074] On the basis of not violating common knowledge in the field, the above-me...
Embodiment 1
[0106] The mass ratio of each component of the combined polyether in this embodiment is shown in Table 1.
[0107] A preparation method of low exothermic, quick release B1 grade polyurethane foam, comprising the following steps:
[0108] (1) 60 parts of polyester polyol AK-7004, 30 parts of polyester polyol PE-B175, 10 parts of polyether polyol DonolR6049, 3 parts of foam stabilizer L-6620NT, catalyst: 0.3 parts of N, N'- Dimethylcyclohexylamine, 1.8 parts of JXP-508, 0.6 parts of JXP-509, 0.8 parts of C-31, 0.8 parts of water, 5 parts of glycerol triglycidyl ether, 3 parts of cyclohexane, 22 parts of flame retardant Add TCPP, 10 parts of flame retardant TEP, and 34 parts of HCFC-141b into a stainless steel mixing kettle, stir at a speed of 500 rpm at room temperature for 1 hour, and discharge the materials to obtain low-heat, quick-release B1-grade polyurethane foam. Combined polyether;
[0109] (2) Under the condition of material temperature of 22°C, according to the mass ...
Embodiment 2
[0111] The proportioning ratio of each component of the combined polyether in this embodiment is shown in Table 1.
[0112] A preparation method of low exothermic, quick release B1 grade polyurethane foam, comprising the following steps:
[0113] (1) 65 parts of polyester polyol AK-7004, 25 parts of polyester polyol PE-B175, 10 parts of polyether polyol DonolR6049, 3 parts of foam stabilizer L-6620NT, catalyst: 0.2 parts of N, N'- Dimethylcyclohexylamine, 2.0 parts of JXP-508, 0.5 parts of JXP-509, 1.0 parts of C-31, 0.9 parts of water, 5 parts of glycerol triglycidyl ether, 3 parts of cyclohexane, 20 parts of flame retardant Add TCPP, 12 parts of flame retardant TEP, and 33 parts of HCFC-141b into a stainless steel mixing kettle, stir at room temperature at a speed of 500 rpm for 1 hour, and discharge the materials to obtain low-heat, quick-release B1-grade polyurethane foam. Combined polyether;
[0114] (2) Under the condition of material temperature of 22°C, according to ...
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