Method for preparing a cross-linkable composition
A polymer, cross-linking reaction technology, applied in adhesive types, polyurea/polyurethane adhesives, coatings, etc., can solve problems such as high toxicological risks
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Embodiment 1
[0322] Example 1 : Preparation of silylated polymers P1 to P3
[0323] The following polymers were prepared under anhydrous conditions according to the following procedure:
[0324] Acclaim 12200 (9 to 11 mgKOH / g IOH, number average molecular weight about 12000) was introduced into the reactor, followed by the additive Ti and the medium was heated to 60-65°C. Next, the IPDI was introduced, mixed for 10 minutes, and then the catalyst was introduced. The mixture was then heated to 70° C. for one hour with stirring. The NCO index is then monitored; if the theoretical NCO index is not reached, the reaction time can be extended by 15 minutes if necessary. When the theoretical NCO index was reached, Dynasilane 1189 was added and the mixture was stirred for 10 minutes. The reactor was then placed in cooling mode and VTMO was added along with Exxsol D 100 and DINP; the mixture was then kept stirring for 20 minutes.
[0325] The amounts shown in the table below are expressed in w...
Embodiment 2
[0328] Example 2 : Preparation of sealant composition C1
[0329] Composition C1 was prepared according to the following procedure: The silylated polymer, DINP, Tinuvin 765 and half of the Dynasilane VTMO were mixed for 5 minutes at low speed. Next, add the powder components: Irganox 1076, TiO 2 , Crayvallac Super and Omyacarb 2T AV. The reaction mixture was stirred at high speed under vacuum until 75 °C was reached. After 15 min at 75 °C, the medium was cooled. Then, the following compounds were added: Exxsol D100, the other half Dynasilane VTMO, Dynasilane 1146 and KKAT 670. The medium was stirred under vacuum at low speed for 15 minutes.
[0330] The amounts shown in the table below are expressed in weight percent relative to the total weight of the sealant composition.
[0331] [Table 2]
[0332]
Embodiment 3
[0333] Example 3 : Properties of the cross-linked composition
[0334] The obtained properties of sealant composition C1 are summarized in the following table:
[0335] [table 3]
[0336]
[0337] The skinning time ("skinning time" in English) is measured in a controlled atmosphere at a temperature of 20°C and a relative humidity of approximately 50%.
[0338]The composition was applied as a film approximately 0.5 mm thick to a glass sheet 76 mm long and 26 mm wide using a wooden spatula. Immediately after application of the film a stopwatch was started and every minute checked with light pressure of the finger if the film was dry or if residue of the composition had transferred to the finger. The skinning time is the time at the end of which the film of the composition is dry and for which no adhesive residue is transferred to the finger. Results are expressed in minutes.
[0339] The measurement of tensile strength and elongation at break ("elongation at break" in E...
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Abstract
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