Emulsifiers for polyurethane-based foams
一种乙氧基化醇、聚合物的技术，应用在疏水亲水-多元醇分散体领域，能够解决多元醇组分混合不充分、增加能耗、聚氨酯不具有性能状况等问题
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preparation example Construction
[0094] Typical preparation conditions include a solution of a polyol and an ethoxylated alcohol of formula A at a temperature of 20m 3 capacity of the blending tank, and mixed with a 30 watt mechanical agitator at approximately 1800 revolutions per minute (rpm).
[0095] foam preparation
[0096] Foam or cellular materials of any of various types known in the polyurethane art can be prepared using the process of the present invention. Typical components of cellular or non-cellular polyurethane formulations include at least one isocyanate-reactive polyol or mixtures thereof, at least one blowing agent, such as water, at least one polyisocyanate, at least one amine catalyst, at least one A metal catalyst and at least one silicone surfactant. Depending on the type and application of the polyurethane, other additives and / or adjuvants may be included, including but not limited to catalysts, carbonates, sulfates, heterocyclic aromatic amides, silica, Phase change or transfer ma...
Embodiment 1
[0132] Stability of natural oil-polyol and polyether polyol blends
[0133] The natural oil polyol and polyether polyol mixtures were prepared at room temperature (20-25°C) using the following procedure. To a 1000 mL beaker was added 20-80 g polyol (A), 0-60 g polyol B, 20-80 g polyol (D), catalyst, surfactant and various amounts of ethoxylated alcohols to be tested. The amounts of the components are shown in Table 2. The mixture was then stirred at 1150 rpm for 60 seconds or until a homogeneous mixture was formed using a mechanical stirrer with a diameter of 90 mm. The mixture was then transferred to a 20 mL glass vial and the vial was left to stand for up to 6 months. The vials were visually inspected periodically for any layer separation in the mixture. If any of the above phenomena were observed, the dispersion was recorded as unstable; otherwise, the dispersion was recorded as stable. Stability results are listed in Table 3.
[0134] Table 2.
[0135] raw ...
Embodiment 2
[0139] Stability testing of polyols with different molecular weights and polyoxyalkylene contents
[0140] Polyol mixtures were prepared according to the procedure of Example 1 using ethoxylated alcohols with different alkyl groups, ethoxy units and thus different HLB values. In Table 4 the amounts of the components in the polyol mixture are shown. The effect of the ethoxylated alcohols on the stability of the resulting mixture was compared after the visual inspection method of Example 1 and the results are listed in Table 5. All ethoxylated alcohols tested fit the following formula:
[0141] RO(CH 2 CH 2 O) n H, wherein R is a linear or branched alkyl group and n is an integer equal to or greater than 1 and equal to or less than 10.
[0142] Table 4. Formulations
[0143]
[0144] Table 5. Stability of Hydrophobic and Hydrophilic Polyol Mixtures with Ethoxylated Alcohols
[0145]
[0146] 23-1, 1-3, 900 and 901 was obtained from Evonik Corp. Propetal 160...
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