Sofia Martinez
Plastic is a synthetic or semisynthetic material that uses polymers as its main ingredient. Its plasticity allows it to be moulded, extruded, or pressed into solid objects of various shapes, making it a versatile and widely used material. Binders, or binding agents, are substances that hold or draw other materials together to form a cohesive whole. They can be organic or inorganic and are used in various applications, including artistic and utilitarian paints. While plastic itself is a versatile material, binding agents specifically designed for plastics, such as plastic-based binding agents for powder injection moulding, have been developed to address specific challenges in manufacturing. Different types of plastics require different adhesives or glues for bonding, and various options are available on the market.
| Characteristics | Values |
|---|---|
| Definition of a binding agent | Any material or substance that holds or draws other materials together to form a cohesive whole mechanically, chemically, by adhesion or cohesion |
| Plastic-based binding agent composition | 75-88% polyoxymethylene, 4-10% modified polylactic resin, 3-10% microcrystalline wax, 2-8% pentaerythritol stearate, 1-10% sebacic acid dibutyl ester, and 0.5-2% antioxidant |
| Plastic-based binding agent properties | Low viscosity, good flowing performance during injection moulding, good mould filling capacity, good green body stability |
| Plastic-based binding agent applications | Widely applied to the powder injection moulding industry, particularly for producing parts with a large draw ratio, small wall thickness, micro size, and complex 3D shapes |
| Plastic types | Polyethylene Terephthalate (PET), High-Density Polyethylene (HDPE), Polyvinyl Chloride (PVC), Low-Density Polyethylene (LDPE), Polypropylene (PP), Polystyrene (PS), and others |
| Plastic bonding methods | Solvent-based bonding, epoxy-based adhesive, cyanoacrylate glue (CA glue), plastic-specific adhesives (e.g. polyethylene or polypropylene) |
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What You'll Learn
Plastic glue
Plastic does have a binding agent, and it is possible to glue plastic. However, different types of plastics require different types of glue. Some plastics may require a plastic glue that incorporates a solvent-based bonding agent, while others may require an epoxy-based adhesive. For example, plastics in categories 1, 2, 4, and 5 are very difficult to glue and require an adhesive for polyethylene or polypropylene. Category 3, PVC, is commonly used in plumbing and can be glued using a two-part primer and PVC solvent cement. Category 6 plastics are made of polystyrene and can be glued using poly cement, epoxy, or
The difficulty in gluing plastic arises from its low surface energy and non-porous, smooth surface, which makes it challenging for adhesives to form a strong bond. However, some glues, such as plastic welds with primer/activator pens, can overcome this issue by creating a chemical or physical surface preparation. Additionally, plastic glue or polystyrene cement melts the plastic surface, resulting in a stronger bond than superglue. Knowing the type of plastic is essential for choosing the right adhesive, and products like Infinity SuperTAC 500 Plastic Bonding Glue Sticks offer a cost-effective solution with strong bonding abilities and heat resistance.
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Plastic bonding methods
Some of the popular methods of joining plastics include solvent bonding, vibration welding, and induction welding. Solvent bonding involves coating plastics with a solvent and clamping them together. The solvent softens the plastics and when it evaporates, the plastics are bonded together. Vibration welding is efficient for forming pressure-tight joints in irregularly shaped plastic parts. Spin welding is another method that uses surface friction to create a circular weld joint. One of the two parts to be joined is spun at high speed while force is applied to hold the two parts together. The resulting friction heats and melts the plastics, and more pressure is applied post-spinning to bond the materials together.
Other methods include mechanical fastening, which is the simplest way of joining plastics. It involves joining plastics together with simple fasteners like latches and nails. Hot plate welding is another method where two plastic parts are melted against a heated platen for a prescribed period of time. The platen is removed and the two parts are forced together, resulting in a strong, permanent, and often hermetic joint bond.
Plastic overmolding is another preferred method for joining plastics as it improves component or device design and performance. It can dampen sound and vibration impact, insulate delicate electronics, and improve chemical and moisture resistance.
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Plastic as a binding agent in other applications
A plastic-based binding agent is prepared from, by weight, 75-88% of polyoxymethylene, 4-10% of modified polylactic resin, 3-10% of microcrystalline wax, 2-8% of pentaerythritol stearate, 1-10% of sebacic acid dibutyl ester, and 0.5-2% of an antioxidant. This plastic-based binding agent can be used in the powder injection moulding industry, particularly for producing parts with large draw ratios, small wall thicknesses, micro sizes, and complex three-dimensional shapes.
The plastic-based binding agent is created by first preheating and stirring metal or ceramic powder. The binding agent is then added, and the mixture is stirred again. Following this, extrusion and pelleting are performed to create a granular feed, which is then used in injection moulding. The resulting green bodies are then catalysed and degreased using nitric acid.
This process has unique advantages in creating products with complicated shapes, uniform textures, and high performance. It is widely used in fields such as communication equipment, medical equipment, automobiles, electronics, and military projects.
The plastic-based binding agent has low viscosity and good flowing performance during injection moulding, contributing to its excellent mould-filling capacity and green body stability.
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Plastic pollution
The plastic pollution crisis is a global problem, with an estimated 19-23 million tonnes of plastic waste leaking into aquatic ecosystems annually. This pollution can alter habitats and natural processes, reduce ecosystems' ability to adapt to climate change, and directly affect millions of people's livelihoods, food production capabilities, and social well-being. It is most visible in developing Asian and African nations, where garbage collection systems are often inefficient or non-existent. However, even in developed countries, the proper collection and recycling of discarded plastics can be challenging.
The management of plastic waste is critical to tackling this issue. Currently, around one-quarter to one-fifth of plastic waste is mismanaged, meaning it is not recycled, incinerated, or stored in sealed landfills. This mismanaged waste is at risk of leaking into the environment and oceans, with factors such as river systems, proximity to coastlines, terrain, and precipitation patterns influencing the probability of ocean pollution. Improving waste management strategies, especially in poorer countries, is crucial to addressing plastic pollution.
While recycling is an important part of the solution, it alone will not solve the plastic pollution crisis. A systemic transformation towards a circular economy is necessary. This includes domestic policies to improve waste management and foreign investments by richer countries to support waste management infrastructure in lower-income nations. Additionally, some governments have taken steps to limit or ban the use of certain plastic items, such as California's ban on plastic bags by 2026.
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Biodegradable plastics
A binding agent or binder is a substance that holds other materials together to form a cohesive whole. Binders are classified as organic or inorganic and can be metallic, ceramic, or polymeric.
There are two classes of biodegradable plastics:
- Bioplastics, which are derived from renewable raw materials such as plants, animals, or microorganisms.
- Plastics made from petrochemicals with biodegradable additives that enhance biodegradation.
While biodegradable plastics offer an ideal solution for single- or short-term use applications, they also face challenges. Many biodegradable plastics are designed to degrade in industrial composting systems, which require well-managed waste systems. If these plastics are discarded into conventional waste streams or end up in the environment, they may not break down properly. Some biodegradable plastics only break down into smaller pieces like microplastics, which are still harmful to the environment.
Recent advancements, such as the work done by scientists at the University of California, Berkeley, have developed ways to make biodegradable plastics truly compostable. By embedding enzymes into the plastic, it can biodegrade into simple molecules with just the addition of water and a little heat. This process eliminates microplastics and has the potential to revolutionize the recycling industry.
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Frequently asked questions
A binding agent is any material or substance that holds or draws other materials together to form a cohesive whole.
Plastic is a synthetic or semisynthetic material that uses polymers as its main ingredient. Different types of plastics require different types of plastic glue. Some plastic glues incorporate a solvent-based bonding, while others may require an epoxy-based adhesive. There are also plastic-based binding agents that can be used for powder injection molding.
Examples of plastic-based binding agents include polyoxymethylene, modified polylactic resin, microcrystalline wax, pentaerythritol stearate, sebacic acid dibutyl ester, and antioxidants. These binding agents have low viscosity and good flowing performance, making them suitable for injection molding applications.
Common types of plastics include Polyethylene Terephthalate (PET), High-Density Polyethylene (HDPE), Polyvinyl Chloride (PVC), Low-Density Polyethylene (LDPE), Polypropylene (PP), and Polystyrene (PS). The binding agents for these plastics can vary, but some common options include super glues, epoxy adhesives, and plastic-specific adhesives, such as those marked for use with polyethylene or polypropylene.
