Organic silicon modified polyurethane sealing agent
A silicone and sealant technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of affecting the strength of the sealant, human and environmental hazards, insufficient strength, etc., and increase environmental performance. , not easy to whitish, good sealing performance
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Example Embodiment
[0029] Example 1
[0030] This embodiment relates to a silicone modified polyurethane sealant, which is prepared from the following raw materials: 60 g of toluene diisocyanate, 200 g of polyether N220, 200 g of polyether 3050, 3 g of epoxy resin E51, and 20 g of silicone Y-9669.
[0031] The preparation method includes the following steps:
[0032] 5) Heat the polyether N220 and polyether 3050 to 120°C respectively, keep for 2h, and perform dehydration treatment. After the dehydration treatment is completed, both the polyether N210 and polyether 3050 are cooled to 50°C for use.
[0033] 6) Under the protection of nitrogen, polyether 3050 and N220 are put into toluene diisocyanate one after another (with an interval of half an hour) under the protection of nitrogen, and then reacted for 2 hours to form polyurethane prepolymer;
[0034] 3) The polyurethane prepolymer is reacted with epoxy resin E51 under the protection of nitrogen at 75-80°C for 1 to 1.5 hours to generate epoxy-modified p...
Example Embodiment
[0036] Example 2
[0037] This embodiment relates to a silicone modified polyurethane sealant, which is prepared from the following raw materials: 100 g of toluene diisocyanate, 470 g of polyether N220, 350 g of polyether N3050, 50 g of organic silicon Y-9669, and 10 g of epoxy resin E51.
[0038] The preparation method includes the following steps:
[0039] 1) The temperature of polyether N220 and polyether 3050 are respectively raised to 120°C and kept for 2h for dehydration treatment. After the dehydration treatment is completed, both polyether N210 and polyether 3050 are cooled to 50°C for use.
[0040] 2) Under the protection of nitrogen, polyether 3050 and N220 are put into toluene diisocyanate one after another (with an interval of half an hour) under the protection of nitrogen, and then reacted for 2 hours to form polyurethane prepolymer;
[0041] 3) The polyurethane prepolymer is reacted with epoxy resin E51 under the protection of nitrogen at 75-80°C for 1 to 1.5 hours to gene...
Example Embodiment
[0043] Example 3
[0044] This embodiment relates to a silicone modified polyurethane sealant, which is prepared from the following raw materials: 80 g of toluene diisocyanate, 250 g of polyether N220, 320 g of polyether N3050, 30 g of silicone Y-9669, and 5 g of epoxy resin E51.
[0045] The preparation method includes the following steps:
[0046] 1) The temperature of polyether N220 and polyether 3050 are respectively raised to 120°C and kept for 2h for dehydration treatment. After the dehydration treatment is completed, both polyether N210 and polyether 3050 are cooled to 50°C for use.
[0047] 2) Under the protection of nitrogen, polyether 3050 and N220 are put into toluene diisocyanate one after another (with an interval of half an hour) under the protection of nitrogen, and then reacted for 2 hours to form polyurethane prepolymer;
[0048] 3) The polyurethane prepolymer is reacted with epoxy resin E51 under the protection of nitrogen at 75-80°C for 1 to 1.5 hours to generate epox...
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