Process for processing organic-silicone modified polyurethane sealant
A processing technology, polyurethane technology, applied in the field of sealants, can solve problems such as poor elongation, poor pollution resistance, poor aging resistance, etc., to achieve stable and excellent adhesion, high physical mechanics, and excellent weather resistance sexual effect
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Embodiment 1
[0030] A processing technique of silicone-modified polyurethane sealant, comprising the following steps:
[0031] The first step is to prepare A component, and this step includes the following steps:
[0032] First, the polyether polyol and isocyanate that have been dehydrated in vacuum are added to a four-necked flask with a thermometer, a condenser, a stirring device and a vent pipe;
[0033] Second, under the protection of high-purity nitrogen, slowly heat the material in the previous step to 60°C and keep the pressure at -0.06MP;
[0034] Third, while stirring at a constant speed, slowly drop silane into the reaction system, control the temperature at 70 °C, take samples every 30 minutes, and measure the content of NCO groups by titration. When it is detected that the NCO groups meet the design requirements, Take out the sample and keep it tightly closed.
[0035] The second step is to prepare component B, and this step includes the following steps:
[0036] First, mix ...
Embodiment 2
[0040] A processing technique of silicone-modified polyurethane sealant, comprising the following steps:
[0041] The first step is to prepare A component, and this step includes the following steps:
[0042] First, the polyether polyol and isocyanate that have been dehydrated in vacuum are added to a four-necked flask with a thermometer, a condenser, a stirring device and a vent pipe;
[0043] Second, under the protection of high-purity nitrogen, slowly heat the material in the previous step to 70°C and keep the pressure at -0.075MP;
[0044] Third, while stirring at a constant speed, slowly drop silane into the reaction system, control the temperature at 70 °C, take samples every 30 minutes, and measure the content of NCO groups by titration. When it is detected that the NCO groups meet the design requirements, Take out the sample and keep it tightly closed.
[0045] The second step to prepare B component This step includes the following steps:
[0046] First, mix talc, l...
Embodiment 3
[0050] A processing technique of silicone-modified polyurethane sealant, comprising the following steps:
[0051] The first step is to prepare A component, and this step includes the following steps:
[0052] First, the polyether polyol and isocyanate that have been dehydrated in vacuum are added to a four-necked flask with a thermometer, a condenser, a stirring device and a vent pipe;
[0053] Second, under the protection of high-purity nitrogen, slowly heat the material in the previous step to 65°C and keep the pressure at -0.07MP;
[0054] Third, while stirring at a constant speed, slowly drop silane into the reaction system, control the temperature at 70°C, take samples every 30 minutes, and measure the content of NCO groups by titration. When the NCO groups are detected to meet the design requirements, Take out the sample and keep it tightly closed.
[0055] The second step is to prepare component B, and this step includes the following steps:
[0056] First, mix talc,...
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