Polyurethane foam premixes containing halogenated olefin blowing agents and foams made from same
A technology of foaming agent and foaming composition, applied in the field of polyurethane and polyisocyanurate foam, can solve the problems of inability to achieve storage stability, difficulty and the like
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Embodiment 1
[0071] All polyol blends were prepared according to the formulations in Table 1 below. The initial reactivity was recorded by reacting the polyol blend (50°F) with the same weight of isocyanate Lupranate M20 (70°F), resulting in an index of 107. To accelerate the aging and hydrolysis reactions of the tin catalyst, the polyol blend was packed into Fisher Porter tubes and heated in an oven at 54°C (130°F) for one week. When using these heat-aged polyol blends to make polyurethane foams, reactivity may vary, depending on the hydrolytic stability of the tin catalyst chosen. The reactivity of the aged samples was recorded similarly to the initial reactivity.
[0072] Table 1. preparation
[0073]
[0074] Seven tin compounds were studied, including dibutyltin di(dodecylmercaptan) (DABCO ? T120, FOMREZ ? UL-1), dibutyltin maleate (DABCO ? T125), two (dodecyl mercaptan) dimethyl tin (FOMREZ ? UL-22), two (dodecyl mercaptan) dioctyl tin (FOMREZ ? UL-32), di-(2-ethylhexylmer...
Embodiment 2
[0085] The following experiments illustrate the use of combined metal and amine catalysts. In formulation A, the stabilized amine catalysts Toyocat DM70 and Jeffcat DMDEE were used together with a low dose of stabilized tin catalyst DabcoT120 (Table 2). When this polyol preblend (50°F) was reacted with the same amount of isocyanate Lupranate M20 (70°F), the gel time was 13 seconds. In formulation B, those stable amine catalysts were used together with high doses of stable tin catalysts DabcoT120 and DabcoK15 (potassium 2-ethylhexanoate). This formulation also contained a higher dosage of water than Formulation A. Following the same procedure as for Formulation A, the initial gel time was 18 seconds.
[0086] Table 2
[0087] components A B Terate 4020 45 60 Voranol 470X 40 30 Voranol 360 15 10 DC 193 1.5 1.5 TCPP 10 10 PHT-4-Diol
[0088] The two polyol preblends were aged for 6 months at room temperature. The reactivit...
Embodiment 3
[0090] Table 3 is another example of using an amine / metal catalyst to achieve the desired shelf life. Formulation C used one amine catalyst and one zinc catalyst, while Formulation D used two amine catalysts and one zinc catalyst. Reactivity studies using the same method as above (reacting the polyol blend at 50°F with the same amount of the isocyanate Lupranate M20 at 70°F) showed that after aging the polyol blend at 130°F for 1 week, Gel time decreased in formulation C (meaning increased reactivity) and remained almost the same for formulation D.
[0091] table 3
[0092]
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