Silane functional prepolymer and isocyanate functional prepolymer blend adhesive composition
A silane functional, adhesive technology, used in polyurea/polyurethane adhesives, polyether adhesives, adhesive types, etc., can solve problems such as high cost, achieve long-term durability, fast connection, fast Effect of cure rate
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[0156] Preparation of Polyurethane Prepolymer A
[0157] Charge 336.14 g of VORANOL to a 2 liter kettle equipped with a stirrer and heating jacket under nitrogen TM 220-56 polyol, 487.13g VORANOL TM232-036 polyol, and 29.58 g of dialkyl phthalate plasticizer. The reactants were mixed and heated under nitrogen until the mixture reached 54°C. Once the mixture reached 54°C, 148.48 g of diphenylmethane 4,4'-diisocyanate (ISONATE TM 125M) and mix. Then, slowly add 0.07g METACURE dropwise TM T-9 tin catalyst. The reaction was exothermic and after the reaction temperature peaked, the reaction was held between 80°C and 85°C for 30 minutes. Then, set the temperature setting of the heating element at 60°C. Thereafter, 463.25 g of dialkyl phthalate and 14.20 g of diethyl malonate were added. The mixture was stirred for 15 minutes. Thereafter N,N'-bis(3-trimethoxypropyl)amine (21.15 g) was added to the kettle and mixed for 60 minutes. Stop the reaction and store the prepolyme...
Embodiment 1
[0159] Mix 630 g of SAX400 silane-functional prepolymer and 3 g of SILQUEST TM A171 Vinyltrimethoxysilane was charged to a 1 gallon mixer. The mixture was degassed and mixed under vacuum for 5 minutes. The vacuum was broken with nitrogen. 90 g of Prepolymer A as described above, 75 g of isocyanatopropyltrimethoxysilane and 244.5 g of alkyl phthalate plasticizer were added to the mixer. The mixture was degassed and mixed under vacuum for 5 minutes. The vacuum was broken again with nitrogen. 450 g of dry carbon black were added. Slowly apply vacuum. When half vacuum is reached, start mixing to wet out the filler for 2 minutes. The vacuum valve was then fully opened and mixing was continued for 20 minutes under full vacuum. The mixture was scraped off under nitrogen. To this mixture was added 3.0 g of LICA TM 09 and 4.5 g DDBSA, and full vacuum was applied again before additional mixing. The mixture was mixed under vacuum for an additional 10 minutes. The vacuum was b...
Embodiment 2 to 3 and comparative Embodiment 4
[0167] Three adhesive compositions were prepared using the procedure described in Example 1 using the components described in Table 2. (QKA) beads derived from these adhesives were applied to PPG-coated ODCT TM 8000 urethane clear coat on metal coupons. After 7 days of initial curing at 23°C and 50% relative humidity (RH), QKA tests were performed and the results are listed in Table 2.
[0168] In addition, the QKA beads from Example 1, Example 3, and Comparative Example 4 were applied to 1 inch by 6 inch (2.54 cm by 15.2 cm) clear glass coupons, which were tested with BETASEAL TM 43518 and BETASEAL TM 43520A Primer Primer. These QKA samples were divided into two groups after initial curing for 7 days under conditions of 23°C and 50% relative humidity (CT conditions). The first group was immediately tested with the QKA test. The second group was placed in an oven at 110°C for different periods of time before performing the QKA test. These QKA results are listed in Table ...
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