Chloe Zhang
Making small plastics is a fun science project for kids and students, providing them with a cool souvenir for later. There are multiple methods to create small plastics, including melting styrofoam in paint thinner or using plastic bags. When using the styrofoam method, it is important to wear protective gear and perform the task in a well-ventilated area. The plastic can then be sculpted into fun shapes and painted. Alternatively, plastic bags can be shredded and melted in oil to create a plastic substance that can be moulded into various shapes.
| Characteristics | Values |
|---|---|
| Ingredients | Styrofoam, acetone, borax, glue, water |
| Tools | Glass jar, gloves, glasses, spoon, bowl/jar, plastic wrap, Lego, plaster of Paris, wire/small tool |
| Process | Melt styrofoam in acetone, dissolve borax in water, thin glue with water, mix solutions, pour into mold, harden, remove from mold, paint |
| Precautions | Well-ventilated area, avoid breathing fumes, wear protective eyewear, adult supervision for kids |
| Tips | Use candy molds or Lego molds, paint before hardening, use wax/oil for smoother surface, shred plastic bags for finer texture, regulate temperature with oil/water |
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What You'll Learn
Collect the right ingredients
To make a small amount of plastic at home, you will need to gather the following ingredients:
- Plastic bags: Collect as many plastic bags as you can, as they will shrink down a lot when melted.
- Oil: Canola oil is a good option, as it has a low viscosity and a boiling point that is suitable for melting plastic.
- Wax: Using wax instead of oil will result in a smoother, non-oily finish.
- Tools: You will need a stick or a similar object to use as a spatula, as well as a clothespin or tongs for stirring and handling hot materials.
- Container: Use an old pot that you no longer use for cooking, or purchase a secondhand one from a thrift store.
- Molds: Decide on the shape you want your plastic to take and gather or create appropriate molds. You can use candy molds, or get creative with household items such as containers or bottles.
Alternatively, if you want to make a basic polymer from simple ingredients, you will need the following:
- Borax: This ingredient will be dissolved in water to create a solution.
- Water: Enough to dissolve the borax and create a thin mixture.
- Glue: Any standard glue will work, and you can thin it out by adding a few spoonfuls of water.
- Acetone or paint thinner: These can be purchased from hardware stores and will be used to melt styrofoam.
- Styrofoam: You can use old packing styrofoam or styrofoam cups and tear them into small pieces.
- Safety equipment: Gloves and glasses must be worn when handling acetone, as it is dangerous. The process should be done in a well-ventilated area to avoid inhaling fumes.
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Prepare the glue
To prepare the glue for making a small plastic model, you will need PVA glue, talc powder, a mixing cup, and a mixer. The quantities of the ingredients depend on how much glue you want to make. For example, you can start with 50g of talc powder and adjust the quantity of PVA glue accordingly.
First, take the mixing cup and add the required amount of talc powder to it. Then, add the PVA glue to the cup. The glue acts as the binder material for the powder. You can also add a small amount of water to the mixture to adjust the consistency of the glue.
Next, use a mixer to combine the ingredients. An interdental cleaner mounted in the chuck of a Dremel mixer works well for small batches. Cover the mixing cup while mixing to prevent spillage. Mix the ingredients for about 3 minutes until you achieve a smooth and lump-free consistency.
Once the glue is ready, you can transfer it to a glue container or use it directly for your plastic model. Remember to clean your mixer immediately after use to prevent the glue from hardening and becoming difficult to remove.
Additionally, if you are working with plastic model kits, you may want to consider using fast-setting glues like Tamiya Extra Thin, Testor's Tube Glue, or super glue. These glues are suitable for bonding different types of materials and can be applied with fine-tipped applicators or brushes for precision.
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Mix and melt ingredients
To make a small amount of plastic at home, you will need to gather the right ingredients and tools. This process involves melting styrofoam in paint thinner to create a semi-hard plastic-type substance that can be moulded into different shapes. Here is a step-by-step guide for mixing and melting the ingredients:
Step 1: Prepare the Ingredients and Tools
- Gather the necessary ingredients: acetone or paint thinner, and styrofoam.
- Wear protective gear, including gloves and eye protection. Acetone is a hazardous substance, so ensure adequate ventilation during the process.
- Prepare a glass jar or container that can hold the ingredients.
Step 2: Mix and Melt
- Pour a small amount of acetone or paint thinner into the glass jar, ensuring you have at least a few centimetres of liquid at the bottom.
- Break up the styrofoam into small pieces. You can use old packing styrofoam or styrofoam cups, tearing them into pieces that can fit into the jar and reach the bottom.
- Place the styrofoam pieces into the jar with acetone, ensuring they are fully submerged.
- Stir the mixture gently with a suitable tool, such as a glass rod or a stirrer.
- Place the jar on a heat source, such as a stove or hot plate, and heat the mixture. The acetone will help dissolve the styrofoam, creating a semi-liquid plastic substance.
- Maintain a low-to-medium heat to avoid overheating and causing a fire hazard.
- Continue stirring the mixture until the styrofoam is completely dissolved and you have a homogeneous plastic solution.
At this stage, you have created a small batch of homemade plastic that can now be poured into moulds or shaped as desired. Always exercise caution when working with chemicals and heat, and ensure proper ventilation throughout the process.
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Pour into moulds
When making plastic at home, there are several methods and moulding techniques you can use to create fun shapes and designs. Here is a step-by-step guide to pouring plastic into moulds:
Prepare the Mould
First, you need to create a mould for your plastic. You can use a variety of materials, such as Lego blocks, bowls, jars, or candy moulds. Line your mould with plastic wrap to make it easier to remove the plastic later. If using Lego, build a box that approximates the shape of your desired piece. Ensure your mould is well-prepared and secure to avoid leaks.
Mix the Ingredients
To make a basic polymer, you will need simple ingredients like borax, water, and glue. Dissolve a small spoonful of borax in water and set it aside. In a separate container, add a few spoonfuls of water to thin out the glue. Stir these ingredients well. You can also try melting styrofoam in paint thinner or using liquid plastic resin as your base.
Pour the Mixture
Once your mixture is ready, carefully pour it into your prepared mould. Ensure you are in a well-ventilated area if using chemicals like acetone or paint thinner. This step requires precision and caution to avoid spills.
Allow it to Harden
After pouring the mixture into the mould, let it cool and harden. You can speed up this process by placing it in the freezer. The hardening time will vary depending on your mixture and the size of your mould, but it could take a couple of hours or overnight to fully harden.
Remove from the Mould
Once the plastic has hardened, carefully remove it from the mould. Peel away the plastic wrap lining, if used. Be gentle and cautious to avoid damaging either the mould or the newly formed plastic.
Finishing Touches
Now, you can further shape your plastic by carving, machining, turning, or drilling it. You can also paint your plastic creation if desired. Enjoy your homemade plastic creation!
Remember to always exercise caution when working with chemicals and heat, and ensure proper ventilation and adult supervision if children are involved.
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Paint and decorate
Painting and decorating a small plastic model can be a fun and rewarding project. Here are some detailed steps to guide you through the process:
Preparation:
Firstly, ensure your work area is well-lit, with bright natural light or a lamp illuminating your model. Prepare your workspace by laying down old newspapers or a pad to avoid paint splashes. Gather your materials, including paint, brushes, and any other accessories you plan to use. Before painting, remove any dirt or dust from the model's surface using a soft cloth. If your model has been coated in resin or chemical agents, you can brush these off or submerge the model in isopropyl alcohol for a better finish.
Priming:
Primer is not always necessary, especially if your model is made solely of plastic. However, if your model is made of multiple materials, use a primer to achieve a uniform colour. White primer is suitable for light colours, while grey primer works best for dark colours. Spray primers are quick and easy to use, but be sure to hold the can 10-12 inches away from the model and spray in quick, even strokes. Allow 24 hours for the primer to settle.
Painting:
There are various methods you can use to paint your model, including an airbrush gun, brush, or spray can. For smaller models, use a dropper to add small amounts of paint to a palette. Mix your paint thoroughly before use, especially if it has been sitting for a long time. Apply multiple thin layers of paint rather than one thick coat to retain the model's details and prevent paint clumping. You can thin your paints with water or use additives for this purpose.
Techniques:
A dry brush technique can be useful for creating special effects and highlighting details. This involves using a brush with minimal moisture to apply paint. For a simple highlighting effect, use the same base coat colour after shading to restore vibrancy and highlight the miniature. For higher contrast, use a finer detail brush to paint along the edges of the miniature with a brighter colour or a white paint tint.
Decorating:
To give your model context and make it stand out, consider basing it with decorative materials such as texture mud, basing sand, flock, or other similar products. These materials add texture and create a unique setting for your model.
Remember to always read the labels on your paint containers and take the necessary health and safety precautions, especially when working with enamel or solvent-based paints.
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Frequently asked questions
You can make small plastics by melting styrofoam in paint thinner, or by dissolving borax in water and adding glue. You can also use plastic bags, melting them in oil.
Always wear protective eyewear when handling acetone or other chemicals. If you are under 15, make sure you have adult supervision. Avoid breathing in fumes and ensure you are in a well-ventilated area.
You can use Lego to build a box that approximates the shape of your piece. Line the box with plastic wrap to make it waterproof and easy to clean. Alternatively, you can use a bowl or jar.
Mix plaster of Paris with water and stir until it forms a thick paint-like consistency. Pour the mixture into your mould and allow it to harden. Peeling away the plastic wrap will reveal your mould.
Place your plastic creation centrally in the box and pour in the plaster. You can also pour your liquid plastic into candy moulds or other shapes and let it harden. Once hardened, you can paint your creation.
