ТO-29-2 is a two part low viscosity epoxy infusion resin developed for high temperature complex shape composite tooling. ТО-29-2 offers simple and flexible processing due to low viscosity at low impregnation temperature (25°С). Pre-curing at room temperature allows to remove composite tool from plastic model. Post-curing at 200°С provides service temperature of tool up to 220°. Self-heating time of 500g from 20°С to 60°С is more than 8 hours. It shows the following features and properties:
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1.16 g/cm³ at 20 °C
3.22 % at 20 °C
for 54h to boiling water
Coefficient of thermal expansionα
7.9E-5 1/K at 20 °C
Glass transition temperatureTg
High-temperature composite tooling which requires the curing temperature up to 190°C.
Samples for testing were obtained by vacuum infusion based on TO-29-2 resin and carbon fabrics 22502 (twill 2x2, 200 g/m2, 3K, 3,95 GPa).
Assemble the vacuum bag. Perform a leak test, the rate of the vacuum drop should not be more than 1 mbar per minute. The residual pressure in the bag must not be more than 10 mbar. Assemble the second vacuum bag, put airweave material between the layers of the vacuum film. Perform a leak test for the second vacuum bag. The residual pressure in the bag must not be more than 10 mbar. Thoroughly mix components A and B at 25°C in a weight ratio of 100: 58.3. The error in the dosage of components should not exceed 2%. Particular attention should be paid to mixing at the walls and bottom of the mixing tank. It is recommended to use devices with automatic mixing and mix under vacuum. Degas for 15-30 minutes, at a pressure of no more than 10 mbar. During the degassing, the resin should be stirred intensively. Maintain a temperature of 20-25°C indoors. The recommended impregnation temperature is 25°C. It is also recommended to dry the reinforcing material in a vacuum bag for at least 3 hours. Maintaining the temperature of the mold at 20-25°C, start the infusion process. After complete impregnation of the bag, close the resin inputs, but continue evacuation from the inner bag for at least 30 minutes. Close the outputs from the inner bag. Continue evacuation from outer vacuum bag until gelation (~ 24h at 25°C). After 48-72 hours, you can remove tool from the master model and post-cure without auxiliary materials. It is recommended to use a quasi-isotropic layouts for tooling. The recommended thickness of the tooling is not less than 5mm. Particular attention should be given to the stiffeners. It is not recommended to mix more than 25kg in same container. For the measurement of vacuum, the use of absolute pressure sensors is recommended. UV lamp can be used for resin front tracking. Post-cure: Heat up to 70°С at rate < 2°С/hour. Heat up to 70 to 190-200°C at rate of 5°C/h. Hold at 200°C for 1 hour. Cool to room temperature no faster than 5°C/min.
This material data has been provided by Matmatch.