Thermosetting solvent-free single-component substances and use thereof
A heat-curable, composition-based technology, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve problems such as slow curing speed, and achieve low curing temperature and time required for the bonding process. , beneficial effect on energy consumption
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[0050] Example 1 (comparative example)
[0051] The prior art composition consisting of epoxy resin and latent curing agent is intended to be regarded as a comparative example. It consists of the following:
[0052] 67% mixture of bisphenol A- and bisphenol F-epoxy resin (EPR166 from Bakelite),
[0053] 27% latent amine curing agent (Ancamine 2014AS from Air Products),
[0054] 3.5% accelerator (Dicyandiamide Dyhard SF 100 from Degussa),
[0055] 2.5% thixotropic agent (Cab-O-Sil M5 from Cabot).
[0056] The following properties of the examples were measured:
[0057] 1. Curing peak
[0058] The reaction peak of the comparative composition was measured on a DSC 822 DSC instrument (DSC = Differential Scanning Calorimetry, Differential Thermal Analysis) from Mettler-Toledo Company, as figure 1 As can be seen from the DSC curve shown, the peak is located at about 125°C.
[0059] 2. Curing speed
[0060] The curing speed in vibration mode at a constant temperature was measured on a r...
Example Embodiment
[0063] Example 2
[0064] The composition of the present invention consists of the following ingredients:
[0065] 73.5% MDI-based polyisocyanate (Desmodur VL R20, Bayer),
[0066] 24.5% latent amine curing agent (Ancamine 2014AS, Air Products),
[0067] 1.5% thixotropic agent (Cab-O-Sil M5, Cabot),
[0068] 0.5% adhesion promoter (Dynasilan Glymo, Degussa).
[0069] The DSC curve of the composition ( figure 2 ) Shows the reaction peak temperature at 74°C, which is about 50°C lower than in the comparative example. The lower reaction temperature makes it obvious that a significantly higher reaction rate than the comparative example can be observed. by image 3 The rheometer curve of the comparative example (the curve on the right) yields a curing time of about 60 seconds at 150°C, while for the composition of the present invention ( image 3 Center left curve) curing time is only 10 seconds. The composition of the present invention requires about 60 seconds to cure at 120°C and 8 mi...
Example Embodiment
[0070] Example 3
[0071] The composition of the present invention consists of the following ingredients:
[0072] 65% IPDI-based polyisocyanate (Desmodur VP LS 2371, Bayer),
[0073] 33% latent amine curing agent (Adeka Hardener EH4337, Asahi Denka),
[0074] 1.5% thixotropic agent (Cab-O-Sil M5, Cabot),
[0075] 0.5% adhesion promoter (Dynasilan Glymo, Degussa).
[0076] Table 1 lists the most important properties of the composition.
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