What products can be produced by polyurethane molds?
• Artificial stone for facing;
• 3D- Panel;
• Flower pots made of polymer concrete;
• Plaster figures and polymer concrete figures;
• Garden furniture made of artificial stone.
What's the advantages of using polyurethane molds?
• Resistant to alkali;
• Wear resistance;
• Maximum product accuracy;
• You can use materials with natural surface relief;
• The finished product requires no additional decoration;
• Ability to create spray/overlay effects of different colors and use different materials together such as plaster, cement and concrete.
How is artificial stone polyurethane mold made?
Take artificial stone polyurethane molds as an example to help you understand polyurethane molds.
Step 1. Prepare your device
Choose a product prototype that can be demolded. Artificial or natural stone is suitable for this. Prepare base scrap boards and MDF or particleboard formwork in the required sizes. Use silicone to secure the stone to the base of the piece. The distance between the stones and the formwork should be greater than 1 cm. We install the template. We treat the final model and frame with a release agent.
Step 2. Preparation of polyurethane
1. Liquid polyurethane consists of two components. Before use, polyol (component A) and isocyanate (component B) must be thoroughly mixed in the original packaging. It is not recommended to work and dump this material in rooms with high humidity, as it reacts with moisture, thereby reducing the quality of the final product. Can be mixed by hand or using a blender. The mixer speed is 100-200 rpm. To avoid separation and violation of the proportions of the materials, they must be mixed before each use.
2. If necessary, the polyol and isocyanate can be degassed in a vacuum chamber.
3. Pour out the required amount of pre-mixed polyol and isocyanate.
4. Stir the mixture with a stick or whisk for 2-5 minutes.
5. Pour the mixture of ingredients into a clean container and stir for another 1-2 minutes.
Step 3. Final stage
1. Filling material.
2. Keep the material on a flat surface for one hour. If necessary, for technical products, perform post-polymerization in an oven at a temperature of 50-60°C for 4-6 hours. More detailed conditions are specified in the polyurethane technical documentation.
3. After letting it stand for 12-24 hours (see technical documentation), disassemble the template, take the sample out of the mold, and let it stand for the required time.
4. Before using polyurethane molds for pouring, release agent should be used.