Polyurethane-based composition comprising at least two acrylic functions
A technology of hydroxylated acrylate, composition, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of not allowing high temperature heat treatment, degradation of adhesive seals, etc.
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Embodiment 1
[0364] Example 1: Preparation of compositions based on polyurethanes with terminal groups T based on polyether polyols and polyester polyols A-1
[0365] 191.8 g of "Scuranate® TX" were introduced into the reactor and heated to 40°C. Then add 22.8 grams of "Voranol® CP 450" and 104.5 grams of "Voranol® P400" in sequence, while taking care to ensure that the temperature of the mixture does not exceed 80°C. When the temperature of the mixture stabilized, the mixture was heated at 80-85°C for about 1 hour and then cooled to 70°C. Then add 323.5 g of "Dekatol® 3008", taking care to ensure that the temperature of the mixture does not exceed 90°C.
[0366] The mixture was kept at 90°C for about 3 hours. The end of the reaction is monitored by controlling the mass percentage of NCO functional groups in the medium, which theoretically must be about 5.9% by weight. When the reaction was complete, the mixture was cooled to 70°C and 107.0 g of 2-hydroxyethyl acrylate and 0.5 g of B...
Embodiment 2
[0369] Example 2: Preparation of compositions based on polyurethanes with terminal groups T based on polyether polyols and polyester polyols A-2
[0370] 153.0 g of "Scuranate® TX" was introduced into the reactor and heated to 40°C.
[0371] 85.2 g of "Voranol® P400" were slowly added and the mixture was heated to 50°C. The reaction mass exothermed to about 70°C. Once the exotherm was under control, the mixture was maintained at 70°C. After reacting for 1 hour, 393.0 g of "Dekatol® 3008" was added. The reaction mass exothermed to about 85°C. The mixture was maintained at 85°C for about 2-3 hours. The end of the reaction was monitored by controlling the mass percentage of NCO functional groups in the medium, which theoretically needs to be about 3.8% by weight. When the reaction was complete, the mixture was cooled to 70°C, and 100 g of ethyl acetate was added. The mixture was homogenized for 20 minutes, then 68 g of 2-hydroxyethyl acrylate were added. 0.4 g of "Borch...
Embodiment 3
[0374] Embodiment 3: the preparation of composition B
[0375] Composition B tested has been prepared by simply mixing polyamine B1 and / or polyamine B2 at room temperature (approximately 23° C.) in the B1 / B2 weight ratios shown in Table 1 .
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