Special silicone RTV2 two-component mold adhesive for large-scale European-style component moldings Relief mold making mold glue

Special silicone RTV2 two-component mold adhesive for large-scale European-style component moldings Relief mold making mold glue

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RTV2 Silicone Rubber Mixing: Key to Influencing Mold Performance

1. Mix A and B components in proportion

Mix according to the specified ratio (e.g. 100:2), weigh A component (base rubber) and B component (curing agent) accurately using clean containers. Avoid deviation in proportion (excessive curing agent will cause the mold to become brittle, while insufficient will result in incomplete curing).

Stir in the same direction during mixing, do not stir too fast (to avoid the generation of a large number of bubbles), and let the mixing time be ≥ 3 minutes to ensure uniform color (no white spots or stripes).

2. Defoaming treatment

Manual small batch: After mixing, let it stand for 5-10 minutes, gently stir with a glass rod to allow the surface bubbles to rise and burst;

Batch production: Use a vacuum defoaming machine (vacuum degree - 0.09MPa) to treat for 2-3 minutes until all bubbles disappear (be careful to avoid silicone rubber overflow).

Key: Complex detailed components must be defoamed; otherwise, the mold will have bubble holes, affecting the accuracy of the finished product.

IV. Injection / Brushing: Choose the process based on the shape of the component

1. Injection method (suitable for small, three-dimensional components, such as stem head decorations, relief small items)

Pour the defoamed silicone rubber slowly along the edge of the mold frame, do not pour too fast (to avoid entrapping bubbles), until the silicone rubber completely covers the prototype, thickness ≥ 1cm (the edges can be slightly thicker to enhance it).

If the prototype has deep grooves, small holes, etc., fill them with a small amount of silicone rubber manually first, then pour the entire silicone rubber, and gently brush the details with a brush to remove the bubbles.

After pouring, gently tap the mold frame or flat plate to allow the bubbles to float to the surface and burst.

2. Brushing method (suitable for large, flat / curved components, such as plaster lines, wall relief)

Step 1: Brush the "detail layer" - Take a small amount of silicone rubber, evenly apply it to the prototype surface, focus on filling the detailed areas thoroughly, thickness about 0.5mm.

Step 2: Reinforcement layer - After the detail layer is semi-cured (about 30 minutes, not sticky to the hand), lay a layer of fiberglass cloth (cut to the size of the mold frame), use a brush dipped in silicone rubber to press the cloth down, avoid wrinkles and bubbles.

Step 3: Thickening layer - Repeat the layering and brushing 2-3 times, total thickness controlled at 3-5mm (adjust according to the size of the component), ensure the overall strength of the mold, edges can be appropriately thickened to 10mm.