Sofia Martinez
Plasticizers are additives used in plastic manufacturing to enhance the flexibility and durability of plastics. They are low-volatility liquids or solid substances that are added to raw polymers like plastics or rubbers to improve their flexibility, make them easier to shape and mould, and reduce friction on their surface. Plasticizers are commonly used in Polyvinyl Chloride (PVC) to make products ranging from hard and rigid materials like pipes to flexible items like shower curtains, tubes, and cable covers. The use of plasticizers in PVC has raised concerns about their potential health and environmental effects, particularly the endocrine disruption caused by phthalate exposure. However, regulatory organizations like REACH and the FDA have determined that most plasticizers are safe.
| Characteristics | Values |
|---|---|
| Definition | Low-volatility liquid or solid substance added to a raw polymer to improve its flexibility, make it easier to shape and mold, and reduce friction on its surface |
| Common Types | Phthalate esters, Polycarboxylate ether superplasticizer (PCE), Polycarboxylate (PC), Lignosulfonate-based plasticizers, Naphthalene and melamine sulfonate-based superplasticizers, Polyesters, Citrates, Bio-based plasticizers, Phosphates, Chlorinated paraffins, Alkyl sulfonic acid esters |
| Uses | Added to Polyvinyl chloride (PVC), cement, rubber, vinyl, wallboard stucco mixtures, wire insulation, carpets, cables, medical devices, cosmetics, toys, etc. |
| Benefits | Improve flexibility and durability, reduce costs, improve processing, enhance safety, improve performance, improve workability, reduce water content |
| Safety | The Registration for Evaluation, Authorisation, and Restriction of Chemicals (REACH) has determined that nearly all plasticizers are safe, along with the FDA. However, studies have shown that endocrine disruption effects from phthalate exposure are a factor to be concerned with. |
| Production Volume | 1.01 million metric tonnes in North America, 1.35 million metric tonnes in Europe, and 8 million tonnes globally |
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What You'll Learn
- Plasticizers are additives that enhance the flexibility and durability of plastics
- They are commonly manufactured from lignosulfonates, a by-product of the paper industry
- Plasticizers are used in many industries, including medical, telecommunications, construction and automotive
- They are classified based on chemical composition, with phthalates being the most common type
- Plasticizers are considered safe by regulatory bodies, but there are concerns about their environmental impact
Plasticizers are additives that enhance the flexibility and durability of plastics
The most common type of plasticizer is phthalate esters, which are used to increase the flexibility of plastics. Phthalates are economical due to their low cost and widespread use, making them difficult to replace. They are compatible with polyvinyl chloride (PVC), the third most common polymer by volume, which can be used in a wide range of applications. Without plasticizers, PVC would remain in its hard and rigid form. However, phthalates have come under regulatory scrutiny due to potential health and environmental concerns, particularly their potential to cause endocrine disruption.
Other types of plasticizers include dicarbonates, which are used in shaping PVC at lower temperatures, and phosphates, which are added to make a material flame retardant. Fatty acid esters are another type of plasticizer used to improve flexibility in rubber and vinyl. Bio-based plasticizers are also available, derived from natural sources such as vegetable oils and starches.
The selection of the right plasticizer is critical to achieving the desired properties in the final product. Factors such as solubility parameter, molecular weight, and chemical structure govern the interaction between the plasticizer and the host material. The efficiency of a plasticizer is determined by its ability to soften the product, with lower molecular weight generally resulting in higher efficiency.
Plasticizers are also used in the construction industry, added to wallboard stucco mixtures to improve workability and reduce the energy required for drying. They are commonly manufactured from lignosulfonates, a by-product of the paper industry. Superplasticizers, which provide more powerful dispersion effects, are also available and are often based on polycarboxylic ethers.
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They are commonly manufactured from lignosulfonates, a by-product of the paper industry
Plasticizers are additives that increase a material's plasticity or decrease its viscosity, enhancing its flexibility, workability, and stretchability. They are commonly used in polymers, concrete, and other materials to improve processability and performance. One of the key sources of plasticizers is the paper industry, which produces a by-product called lignosulfonates that serves as a raw material for these important additives.
Lignosulfonates are generated during the sulfite pulping process, a method used to liberate cellulose fibers from wood for paper production. This process involves treating wood chips with a mixture of sulfurous acid and either magnesium or calcium bisulfite. The treatment breaks down the lignin, a complex polymer that binds cellulose fibers together, and the resulting product is a soluble lignosulfonate salt.
These lignosulfonates are then further processed to create plasticizers. They undergo purification and filtration steps to remove any impurities that could impact the final product's performance. This can include treatment with alkalis to adjust the pH and remove unwanted contaminants. The purified lignosulfonates are then dried and ground into a fine powder.
As plasticizers, lignosulfonates are valued for their ability to reduce water use and improve the flow properties of concrete. They are added to concrete mixes to increase the plasticity of the wet mix, making it easier to work with and improving its ability to fill formwork completely. This results in a more cohesive and less porous concrete with improved strength and durability.
The use of lignosulfonates as plasticizers offers several advantages. Firstly, they are highly effective at reducing water requirements in concrete, which can lead to significant increases in strength and durability. Secondly, they are considered environmentally friendly as they are derived from a renewable and sustainable source – the by-products of the paper industry. This makes them a preferred choice over some other petroleum-based plasticizers.
Additionally, lignosulfonates can also act as water reducers and set retarders, providing additional benefits in concrete applications. They can delay the setting time of concrete, allowing for extended workability on-site, and they improve the flow characteristics, making it easier to pump and place the concrete. Overall, the use of lignosulfonates as plasticizers contributes to improved concrete performance and ease of use.
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Plasticizers are used in many industries, including medical, telecommunications, construction and automotive
A plasticizer is a substance that is added to a material to make it softer and more flexible, to increase its plasticity, to decrease its viscosity, and/or to decrease friction during its handling in manufacture. They are commonly added to polymers and plastics such as PVC, either to facilitate the handling of the raw material during fabrication or to meet the demands of the end product's application.
Plasticizers are used in many industries, including medical, telecommunications, construction, and automotive. In the medical industry, plasticizers are used in medical thermoforming to create IV bags and flexible devices. They are also used in the automotive industry for automotive cable and wire application and molding flexible hoses. In telecommunications, plasticizers form a durable, low-friction, flexible casing around wires and cables.
Plasticizers are also used in the construction industry, particularly in concrete and stucco. Adding one to two percent of a plasticizer to concrete allows for less water to be used, creating a stronger, more workable substance. This also applies to wallboard stucco, where the use of a plasticizer reduces drying time. Plasticizers are commonly manufactured from lignosulfonates, a by-product of the paper industry. They are also used in rubber and adhesives.
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They are classified based on chemical composition, with phthalates being the most common type
Plasticizers are additives incorporated into plastics to enhance their flexibility and durability. They are classified based on chemical composition, with phthalates being the most common type. Phthalates are used to introduce flexibility into plastics, and they account for almost 90% of polymer plasticizers, predominantly in PVC. Phthalates are esters of polycarboxylic acids with linear or branched aliphatic alcohols of moderate chain length. They are selected for their low toxicity, compatibility with the host material, non-volatility, and cost-effectiveness.
However, due to health concerns, there has been a shift away from traditional ortho-phthalates towards alternative types, especially in Europe. Diisononyl phthalate (DINP) is a high molecular weight ortho-phthalate that serves as a replacement for DEHP, which has faced deselection due to performance degradation over time and regulatory restrictions. DINP is colourless, nearly odourless, slightly water-soluble, and compatible with all monomeric plasticizers used in PVC compounding.
Other types of plasticizers include adipates, used for low-temperature applications or resistance to ultraviolet light; sebacates, which offer excellent compatibility with plastic materials and synthetic rubbers; and trimellitates, used in wire and cable applications where higher service temperatures are required. Bio-based plasticizers are also being investigated, derived from materials such as epoxidized soybean oil, epoxidized linseed oil, and various vegetable oils.
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Plasticizers are considered safe by regulatory bodies, but there are concerns about their environmental impact
A plasticizer is a substance that is added to a material, usually a polymer or plastic such as polyvinyl chloride (PVC), to make it softer and more flexible, to increase its plasticity, to decrease its viscosity, and/or to decrease friction during its handling in manufacture. Plasticizers are commonly added to polymers and plastics to either facilitate the handling of the raw material during fabrication or to meet the demands of the end product's application.
Plasticizers are commonly manufactured from lignosulfonates, a by-product of the paper industry. They are colorless and odorless esters, mainly phthalates, that increase the elasticity of a material. The choice of alcohol and acid will determine the type of ester that can be produced and hence the kind of plasticizer. The combinations are almost endless, but only a few have survived the rigorous performance, cost, availability, health, and environmental requirements that are imposed by the market and regulations.
Plasticizers are considered safe by regulatory bodies such as the Registration, Evaluation, Authorisation, and Restriction of Chemicals (REACH), which is the most comprehensive product safety regulation globally, and the FDA. However, there are concerns about their potential health and environmental impacts. Recent scientific research has generated growing concerns about the potential health risks associated with these omnipresent substances. Studies have shown that specific plasticizers possess the capacity to disrupt both animal and human endocrine systems, leading to their classification as endocrine-disrupting chemicals (EDCs). There is also evidence that prolonged and low-dose exposure to plasticizers may have harmful effects on the endocrine, reproductive, and neurological systems, potentially causing chronic diseases.
The environmental impact of plasticizers is also a cause for concern. Plasticizers, including phthalates, have seen global utilization on an unprecedented scale, resulting in extensive exposure to humans and the environment. The shift to incorporate alternative plasticizers without completely understanding their toxicities may have similar detrimental impacts on public health and the environment. There is a general lack of toxicological and environmental impact studies on alternative plasticizers, and research in this area is urgently needed.
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Frequently asked questions
A plasticizer is a low-volatility liquid or solid substance added to a raw polymer like plastic or rubber to improve its flexibility, make it easier to shape and mould, and reduce friction on its surface.
Plasticizers are classified based on their chemical composition. Some common plasticizers include phthalate esters, fatty acid esters, polyesters, citrates, bio-based plasticizers, and more.
Plasticizers are used to make materials softer and more flexible. They are commonly used in industries such as medical thermoforming, telecommunications, construction, and automotive.
The safe use of plasticizers is regulated by organizations such as REACH and the FDA, which have determined that most plasticizers are safe. However, there are potential health and environmental concerns associated with certain plasticizers, particularly phthalates, which can have endocrine-disrupting effects.
Plasticizers work by embedding themselves between the chains of polymers, increasing the "free volume" and reducing the glass transition temperature, making the plastic softer and more flexible. Plasticization can occur both internally and externally, with internal plasticization being the most common method.
