Reaction resin composition and use thereof
A resin composition, reaction technology, applied in the direction of adhesive types, ester copolymer adhesives, pins, etc.
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Embodiment 1 to 7
[0115] In order to evaluate the suitability of initiator systems based on cold-curing methacrylates and the possibility of setting the gel time with the aid of inhibitors, a model mixture consisting of monomers and initially free of UMA prepolymer was prepared.
[0116] Preparation of Model Mixture
[0117] The Cu salt and optionally the inhibitor were dissolved in the monomer in a polypropylene beaker, optionally with heating. Ligand and initiator are dissolved in this homogeneous solution at room temperature. As soon as a homogeneous solution appeared, polymerization was initiated by addition of reducing agent (30 sec vigorously stirred addition). The amounts used in each case are listed in Table 1. Table 1 also shows the observations after mixing all components.
[0118]
Embodiment 3
[0119] Example 3 was used as the basis for determining the gel time and pull-out strength. To this end, a model mixture was prepared with four times the amount of the ingredients of Example 3 given in Table 1, and the gel time and pull-out strength were determined as described below.
[0120] Determination of gel time
[0121] Determination of the gel time of the model mixture using a commercially available device Carried out at a temperature of 25°C. For this, all the ingredients were mixed and immediately after mixing the temperature was brought to 25° C. in a silicone bath and the temperature of the sample was measured. Here, the sample itself is in a test tube which is placed in an air jacket immersed in a silicone bath for temperature regulation.
[0122] Plot the exotherm of the sample versus time. The evaluation is carried out according to DIN16945. The gel time is the time to reach a temperature increase of 10K, here from 25°C to 35°C.
[0123] ●Time until 35°...
Embodiment 8 to 10
[0133] Model mixtures were prepared analogously to Examples 1 to 7, in which inhibitors were used in different concentrations.
[0134] It will be shown from the following examples that the initiation of the polymerization can be delayed by adding suitable inhibitors and thus the gel time of the model mixture can be controlled by the amount of inhibitor added.
[0135] Table 2: Composition of the model mixtures of Examples 8 to 10
[0136]
[0137] In Example 8, a strong polymerization reaction started after 5 minutes, in Example 9 after 11 minutes, while in Example 10 the polymerization reaction was inhibited too strongly, no polymerization was observed reaction.
[0138] Thus, Examples 8 to 10 show that initiation of polymerization can be controlled by the amount of inhibitor and that arrest is reached at high inhibitor concentrations.
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