Useful Tips

Starch bioplastics: ingredients and recipes

Pin
Send
Share
Send
Send


To do this, you need to take water, white vinegar, starch and glycerin. Mix everything and heat the mixture to make it transparent. After that, pour it on the parchment and let it cool. After that, it can be used.

If you use gelatin, then the manufacture of plastic will be slightly different. You will need to combine all the ingredients in the pan and cook them until all the lumps are removed in the mixture. Maybe you need a mixer to break up lumps. Place the saucepan on the stove and boil the mixture at a low temperature. If you plan to make the plastic material colored, add a little dye to the mixture.

Heat the mixture to a high temperature, it should foam. After that, remove the saucepan from the stove, continue stirring the mixture. Pour the plastic onto a plate covered with foil. After that, you will need to wait until it hardens.

You can use improvised tools and ingredients to create plastic at home, or you can purchase the Oyster scientist’s kids kit. With it, you can cook plastic quickly and easily. You can buy such a kit on the website https://oysterkit.ru/projects/bioplastik-iz-krahmala.

The preparation of bioplastics using this kit will take place in several stages. First you will need to prepare a solution. To do this, pour in a container of water, pour glycerin with citric acid and mix well. After that, you will need to fill in the starch. The mass will be more dense. Heat the resulting mass; place a container on the stove. Warm up the product and constantly stir it. After the mass becomes thick, remove it from the stove. You will receive a liquid mass, which will need to be dried before it turns into a finished product. After that, you can use the plastic and dispose of it without harm to the environment.

Take a flat plate and pour the mixture on it. Put it to dry on the windowsill. Soon the soft mass will be able to turn into a bioplastics. Children are very fond of creating something with their own hands. Making bioplastics is very simple and fun.

1. Chemical

  • 250 ml of water
  • 2.5 g of starch
  • 30 ml of a solution of 1 mol / l hydrochloric acid
  • 20 ml glycerin

30 ml of a solution of 1 mol / l sodium hydroxide

  • indicator paper
  • Water, starch, glycerin and hydrochloric acid are mixed and boiled for 15 minutes on a burner, then the mixture is neutralized with an alkali solution and laid out on a substrate.

    Starch bioplastics + receiving video

    Thermoplastic starch is very popular today. Conventional starch bioplastics can be produced even at home. Pure starch tends to absorb moisture. Therefore, it is great for producing medical products (drug capsules). The role of plasticizers in this case is played by sorbitol, as well as glycerin. The characteristics of thermoplastic starch can be adjusted by the ratio of these additives and adapt the raw material so that it can be used for specific purposes.

    Starchy bioplastics are quite often mixed with biodegradable polyesters. Vivid examples are starch / PCL and starch / Ecoflex mixtures (product of BASF). Such mixtures are typically biodegradable and are used continuously in industry. Other companies, such as Roquette, have created their own product - a mixture of starch - polyolefin. Such compounds of materials are not degradable, but their carbon footprint is much smaller than the footprint of plastic made from petroleum, which are used in the same applications.

    How to get plastic from corn:

    Some aliphatic polyesters

    Typically, these are polyhydroxyalkanoates (PHA) or similar substances PHB, PHV and PHH. Polyhydroxyalkanoate is a representative of the type of linear polyesters that naturally appear during the bacterial fermentation of lipids and sugars. Polyhydroxyalkanoates appear as a result of the interaction of bacteria in order to preserve carbon. On an industrial scale, polyester is extracted and cleansed of bacteria through optimization of fermentation volumes. In the RNA group there are almost several hundred different monomers with extremely different characteristics. This type of bioplastics is widely used in the medical field.

    2. Acetic

    • 1 tbsp. spoon (10 g) of starch
    • 4 tbsp. tablespoons (60 ml) of water
    • 1 teaspoon (5 ml) vinegar
    • 1 teaspoon (5 ml) of glycerin

    All ingredients are mixed in a saucepan and cooked with constant stirring until thickened. The mixture is cooled and molded.

    • 1 cup starch
    • 2 cups of soda
    • 0.5 cups of water

    Recipe for a home-made mass for modeling. After drying, hardens.

    • 1 teaspoon (3 g) starch
    • 45 mg table salt
    • 2/3 cup (160 ml) of 1% glycerol solution

    Recipe from Green-plastics.net. Mix all ingredients, heat on a stove with constant stirring to 95 ° C or until foaming begins. Remove from heat while continuing to stir mass to precipitate foam. The hot mass is laid out in the mold and left to dry.

    Reaction mechanism

    For a better understanding of the similarities and differences between formulations and to facilitate the search for the right approaches to starch preparation, it is important to understand the mechanics of the reactions that occur during its preparation and their purpose.

    Starch consists mainly of two types of polysaccharides: linear amyloses and branchy amylopectin. To obtain plastic, linear molecules are much better suited, which is why acids and salts are present in the recipes. Ions in solution contribute to the hydrolysis of bonds connecting the branches of amylopectin, breaking it into many shorter amylose chains. These long molecules become entangled and form strong bonds.

    Such strong weaves lead to the formation of a sufficiently hard and rigid plastic, which can cause its fragility and limited scope of application. In order to provide some slippage between the chains and make the material flexible enough, in many recipes there is glycerol. It acts as a lubricant in the structure of the resulting plastic and makes it soft and flexible.

    With an understanding of these mechanisms, one can begin to collect the ingredients necessary to begin practical manufacturing experiments. “Starchy plastic” do it yourself.

    Ingredients

    Potato starch is sold at almost any grocery store. There it will not be difficult to purchase vinegar, soda, salt. Glycerin is sold in pharmacies in vials. Hydrochloric acid and sodium hydroxide can be purchased at a chemical store, but it’s easier to do without these caustic industrial components.

    Pin
    Send
    Share
    Send
    Send