Reinforced product comprising a composition containing a rapid vulcanisation accelerator and tyre comprising said reinforced product
A technology of vulcanization accelerator and composition, which is applied to the reinforcement layer of pneumatic tires, special tires, transportation and packaging, etc., and can solve the problems of prolonged preparation time, difficult processing, high cost, etc.
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[0112] Preparation of coating composition
[0113] The rubber composition forming the coating rubber is prepared in a suitable mixer according to usual procedures well known to the person skilled in the art using two successive stages of preparation: up to between 130°C and 200°C, preferably between 145°C and 185°C The first stage of thermomechanical manipulation or kneading (sometimes called the "non-preparative" stage) is carried out at an elevated temperature of maximum temperature, followed by mechanical operation at a lower temperature, usually below 120°C, for example between 60°C and 100°C. In the second phase of the operation (sometimes referred to as the "preparation" phase), the vulcanization system is introduced during the finishing phase.
[0114] The method that can be used to prepare such a rubber composition preferably comprises the following steps, for example:
[0115] - Introduce in the mixer the diene elastomer and the reinforcing filler and optional othe...
Embodiment 1
[0138] 3.3 - Example 1 - Rubber test
[0139] For the requirements of these tests, rubber compositions were prepared according to the present invention, the formulations of which are shown in Table 1; the contents of the different products are expressed in phr (parts by weight / 100 parts by weight of elastomer).
[0140] The following procedure was used for the preparation of these compositions: the reinforcing filler (carbon black and / or silica), the diene elastomer and various other ingredients in addition to the vulcanization system were introduced continuously into an internal mixer which The initial vessel temperature of the mixer was about 50°C; therefore the mixer was filled to about 70% (volume %). Thermomechanical manipulation (non-production stage) is then carried out in one step for about 3 to 5 minutes until a maximum "outgoing" temperature of 160°C is reached. The mixture thus obtained is recovered and cooled, before introducing sulfur and accelerators of sulfen...
Embodiment 2
[0159] 3.4-Example 2-Adhesion test of coating composition and filamentary reinforcement
[0160] In order to test the adhesion of the coating composition to the filamentary reinforcement, the measurement is carried out according to the standard ASTM D2229.
[0161] Compositions C(a) (control) and C(b) (according to the invention) shown in Table 3 below were combined with a brass metal reinforcement consisting of 2+7 0.7% carbon steel wires 28 / 100 e The millimeter diameter consisted of an assembled lay length of 7.5mm / 15mm, brass containing 68% copper, clad or unclad, as shown in Table 4 below, and the adhesion of the coating composition to the reinforcement was tested for these combinations. combine. In the case of reinforcement cladding, the cladding is made of polyamide 6-6, the average thickness of the cladding is about 0.14 mm for a clad cord diameter of ca. 1.35 mm, and is bonded by RFL agent coverage.
[0162] table 3
[0163] C(a) C(b) Natural ...
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Abstract
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