Soft urethane foam and preparation method thereof
A flexible polyurethane and foam technology, applied in the field of aromatic isocyanate-based polyurethane foam and its preparation, can solve problems such as limited applicability, loss of stabilizer, swelling and deformation, and achieve the effect of a large range of formula components
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Embodiment 1-7 and comparative Embodiment C1-C5
[0127] The flexible polyurethane foams of Examples 1-7 and Comparative Examples C1-C5 were prepared by mixing the components shown in Table 1. All selected ingredients were conditioned for at least 24 hours in a thermostat controlled at 26±1° C. before preparation. The ingredients, except the organotin compound and isocyanate, were premixed together in a 1.5 liter stainless steel beaker for 40 seconds using a Cowles type mixer set at a rotation speed of 1,500 rpm prior to adding the organotin compound. After premixing, the organotin compound was then added to the cup and mixed for an additional 20 seconds with the rotation speed set at 1,500 rpm. The selected isocyanate compound was then added to the resulting mixture and mixed with the resulting composition at 3,000 rpm for 5 seconds. The mixture is then poured into a 45 cm (length)*45 cm (width)*45 cm (height) paper-lined wooden box with the top open and foamed. After the foam reached its final height, it was allowed to re...
Embodiment 5
[0133] In Example 5 and Comparative Examples C3 and C4, a closed-cell foam was obtained, and when the internal temperature began to drop, the foam began to shrink. The cells are broken by rolling the foam twice through a pair of electric stainless steel roll breakers to prevent further shrinkage. The milled broken foam was conditioned in a temperature controlled room at 23 ± 1 °C for at least 72 hours prior to further physical property testing. The physical properties described in Example 5 and Comparative Examples C3 and C4 were determined using samples cut from the foam cores after crushing.
[0134] Examples 1-7 illustrate the processability, foam mechanics and formulation flexibility in the preparation of flexible polyurethane foams of the present invention.
Embodiment 8-19
[0136] Examples 8-19 in Table 2 were prepared using the same procedure used in the preparation of Examples 1-7, and all selected ingredients were temperature-conditioned for at least 24 hours in a thermostat controlled at 26±1° C. before preparation.
[0137] Foam samples were then cut from the prepared foam cores using a laboratory scale power saw according to the sample dimensions described in ASTM D3574-03 method. Samples for testing were then die cut from foam boards of specified thickness according to the sample dimensions described in ASTM D3574-03 method. All samples were conditioned for at least 24 hours in a room controlled at 23 ± 1°C and 50% humidity prior to further physical property testing.
[0138] The foam physical property tests of Examples 8-19 were performed following the same procedure as shown in Examples 1-7 except for the UV stability test. In the UV stability test, a sample of 5cm (width)*10cm (length)*0.5cm (thickness) was placed in an oven with an in...
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