Types Of Dyes And Their Properties

 What are dyes?

A dye is used to add colour to different materials. Dye Manufacturers in India, For humans, colour has always held great fascination and appeal. Both natural and synthetic dyes are common types. They give kitchenware, textiles, leather goods, and even food products colour. For colouring various items, several dyes are available. The finely crushed substances found in paint, ink, and other goods that are called pigments are not dyes. In contrast to pigments, which are inorganic substances, dyes are organic substances. Everything these days comes in a variety of hues and textures. And the enormous array of colours makes this possible.

Various Types Of Dyes:

Basic Dyes

These colours are generated synthetically and cannot dissolve in water. They also go by the name of cationic dyes. Basic Dyes Manufacturers in India. These dyes have a good retention period and all of their shades are very brilliant. Acrylic fibres are coloured using basic dyes, which are reasonably priced. They react well with synthetic materials.

Vat Dyes

Vat dyes, commonly referred to as indigo dyes, are produced utilising a variety of plants. Vat dyes are applied by a method known as vatting rather than directly colouring the substrate. These dyes are insoluble in water and must be vetted to become soluble. The particles in vat dyes are quite tiny compared to other dyes. These come in fewer tints and colours. Experts typically utilise vat dyes because of the lengthy dyeing procedure.

Direct dyes

They are used to colour cellulose textiles like cotton since they are soluble in water. When utilising these kinds of dyes, dyeing is often carried out in an alkaline environment. But all the materials dyes using this type of dye require after-treatment and care to improve the shade of the dye. Direct Dyes have excellent fastness characteristics. The textile industry makes substantial use of these colours.

Acid Dyes

They are frequently used to colour protein fabrics including nylon, silk, and wool. These colours are very water-soluble. They are inappropriate for use with cellulosic material. Acid dyes work well to colour leather and other medicinal items since they have good dye fastness properties. They're excellent for the food business as well. They are also used to produce ink such as ink for printers, ballpoint pens, marker ink, ink pads, etc.

Synthetic Dyes

These artificial dyes are created chemically. They come in a wide variety of hues and tones. Because of their relatively low cost and simplicity of usage, they are used in many different sectors. Both the ecosystem and the human body are harmed by it. Yet, the use of these colours continues to grow. Some chemical substances are water-soluble.

Reactive Dyes

For cellulose, protein, and polyamide fibres reactive dyes work well. These dyes are simple to use because they come in a variety of formats. They have good light-fastness qualities and are soluble in water. Since all reactive dyes come in vibrant hues, they are ideal for the textile sector. These reactive dyes are affordable and suitable for use in large quantities. They block UV radiation and have an excellent electron arrangement.

Solvent Dyes

The emerging textile mills employ these contemporary colours extensively. Solvent dyes are non-corrosive, non-toxic, and non-flammable dyes. The fibres and polymers can be coloured more quickly and easily with these dyes. They are also quite wettable. These dyes have a significant downside in that bulk application is challenging due to the solvent’s frequently high cost. Solvent dyes come in a wide variety and make excellent alternatives to traditional, hazardous dyes.

Food Dyes

These are the synthetic colours that have been added to the meal to make it more appealing. These days, food colours are frequently utilised. The several forms they come in include pastes, liquid colours, gels, and coloured powders. These food colouring agents are used to restore the edible's colour after it has been exposed to light, heat, and storage. Food dyes must be used with caution because using them excessively might lead to several health issues. There are two types of food dyes: natural and artificial. Natural food colours can make meals more appealing and nutrient-dense. Before choosing the best food dye, exercise caution and undertake a thorough study.

Seed Colouring dyes

To help farmers to distinguish and identify different types of seeds, seed colouring dye is used to give colour to the seeds. Many kinds of seeds have various colours. The traditional method of protecting seeds and promoting plant growth is seed colouration. This strategy has also been used by major seed companies to brand their seeds. Seed colouring is a fantastic technique to distinguish the seeds and stop them from being harmed. These days, a variety of seed dyes are offered; try to select a safe dye as this can affect the growth of the plants and crops.

Conclusion 

The dyes mentioned above are just a few of the many different kinds of dyes available. Each of them has advantages and disadvantages. Depending on the product’s kind and intended usage, one must select the dye that is best for them. Veeraco Colourants Pvt Ltd is one of the best dye manufacturers of India with generations engaged in the business, they are one of the Top Dyes Manufacturers in India and have been fulfilling the colouring needs of the world for ages. Employing the latest techniques, learning from experiences, retaining a standard of products, and simultaneously turning into a brand everyone trusts. They are renowned for their high-performance pigments, which are employed in a variety of different applications from automotive coatings to fibre-grade masterbatch applications.

What is Dyes and Pigments? Advantages and Disadvantages

 

Dyes and pigments are both types of colorants used to add color to various materials. However, there are some key differences between the dyes and pigments.

Dyes are colorants that are soluble in a liquid solvent. When a dye is added to a material, it dissolves into the material, creating a uniform and transparent color. Dye Manufacturers in India, Dyes are commonly used to color fabrics, paper, textile, leather and other materials.

Pigments, on the other hand, are insoluble particles that are mixed with a binding agent to create a paste or powder. When applied to a material, the pigment particles are dispersed but not dissolved, creating an opaque and non-uniform color. Pigments are commonly used in paints, inks, plastics, fabrics, cosmetics and food.

Another key difference between dyes and pigments is their durability. Dyes tend to be less durable than pigments, as they can fade or bleed over time, especially if exposed to sunlight or washing. Pigments, on the other hand, are more resistant to fading and are often used in applications that require long-lasting color, such as outdoor paints.

Dyes:

1.     Dyes can be derived from natural sources, such as plants and animals, or they can be synthetic, produced through chemical processes.
2.      Dyes are typically used on materials that have a high affinity for the dye molecule, such as cotton, silk, and wool.
3.     Dyes can be categorized into different types based on their chemistry, such as acid dyes, basic dyes, and direct dyes.
4.      Dyes can also be classified based on their application method, such as immersion dyeing, printing, and spray dyeing.

Pigments:

1.     Pigments can be organic (carbon-based) or inorganic (metal-based) compounds, and they can be derived from natural sources or synthesized in a laboratory.
2.       Pigments are typically used on materials that have a low affinity for the pigment particles, such as plastics and metals.
3.     Pigments can be categorized into different types based on their chemical composition, such as titanium dioxide, iron oxide, and phthalocyanine blue.
4.    Pigments can also be classified based on their particle size, such as Nano-pigments, micro-pigments, and macro-pigments.

Top Dyes Manufacturers in India, describes both dyes and pigments have advantages and disadvantages, and the choice between the two depends on the specific application and desired outcome. For example, dyes are often preferred for coloring fabrics, as they provide a more even and vibrant color, while pigments are often preferred for painting and printing, as they offer a wider range of colors and greater durability.

Source: https://dyesandpigments.mystrikingly.com/blog/what-is-dyes-and-pigments-advantages-and-disadvantages

What is the difference between Basic Dyes and Sulphur dyes?

Basic dyes and Sulphur dyes are two types of colorants used in textile dyeing. The main differences between them are:

Chemical Structure: Basic dyes are water-soluble cationic dyes that are derived from bases such as Triphenylmethane, xanthene, or methylene blue. On the other hand, sulphur dyes are water-insoluble anionic dyes that contain sulphur -containing groups, such as thio groups.

Dyeing Mechanism: Basic dyes manufacturers in India, are primarily used for dyeing acrylic and cationic dye able polyester fibers by forming an electrostatic attraction between the positively charged dye molecule and the negatively charged fiber surface. On the other hand, sulphur dyes are used for dyeing natural fibers, such as cotton, wool, and silk, by forming a covalent bond with the fiber surface.

Color Fastness: Basic dyes have poor color fastness properties and tend to fade easily when exposed to light, water, or chemicals. On the other hand, sulphur dyes have excellent color fastness properties, particularly to light and washing, and are widely used for dyeing dark shades of cotton.

Environmental Impact: Basic dyes are considered to be more environmentally hazardous than sulphur dyes because of their toxicity and potential to contaminate water resources. sulphur dyes, on the other hand, are considered to be relatively safe and eco-friendly due to their low toxicity and biodegradability.

Application: Basic dyes are commonly used for bright, vibrant colors such as red, pink, and blue, while sulphur dyes are often used for darker shades such as black, brown, and navy.

pH Sensitivity: Basic dyes require an alkaline pH for effective dyeing, while sulphur dyes manufacturers in India, sulphur dyes require an acidic pH. This difference in pH sensitivity affects the dyeing conditions and may require different chemicals to adjust the pH levels.

Fiber Compatibility: Basic dyes are typically used on synthetic fibers such as nylon, acrylic, and polyester, while sulphur dyes are commonly used on natural fibers such as cotton, wool, and silk. However, some blends of synthetic and natural fibers can be dyed with either type of dye.

Dyeing Process: Basic dyes are typically applied in a one-bath process, where the dye is added to a bath of hot water and the fabric is immersed and agitated. sulphur dyes, on the other hand, require a two-bath process, where the fabric is first treated with a reducing agent to open up the fiber structure and create reactive sites, and then immersed in a bath of the  sulphur dye.

Cost: Basic dyes are generally less expensive than sulphur dyes, but this can vary depending on the specific dye and the quantity used.

In conclusion, basic dyes and sulphur dyes differ in their chemical structure, dyeing mechanism, color fastness, environmental impact, pH sensitivity, fiber compatibility, dyeing process, and cost. Dye Manufacturers in India, Understanding these differences can help determine the appropriate dye to use for a particular textile material, color, and desired outcome.

Read More: Basic Dyes Manufacturers in India

What is the importance of Vat Dyes?

 

Vat dyes are a type of synthetic dyes that are known for their excellent wash and light fastness. They are commonly used to dye cellulose fibers, such as cotton, as well as some protein fibers, such as wool. Vat dyes manufacturers in India can produce a wide range of bright and vibrant colors, including blues, greens, and reds.

Vat dyes are called so because they are reduced to a soluble form known as a "leuco" or "vatting" form before being applied to the textile. Once the dye is applied, it is then oxidized to its insoluble form, which is then trapped inside the fiber. This process is known as "vatting" and is often done in an alkaline solution, which helps to improve the colorfastness of the dye.

The process of vatting can be done using several different methods, including the traditional method of fermenting indigo plants to produce indigo dye, as well as more modern chemical methods. Indigo is the most well-known vat dye, and it has been used for centuries to dye denim fabric.

Vat dyes are commonly used in the textile industry, particularly for denim and workwear fabrics. They are also used in the production of household goods, such as curtains and upholstery. Additionally, some vat dyes are used in the paper industry to color paper.

It's important to note that vat dyes can be hazardous to handle and use, and proper safety precautions should be taken when working with them. Additionally, different vat dyes have different properties, and it's important to choose the right dye for a specific application to ensure optimal color performance and durability.

WHAT ARE THE IMPLEMENTATIONS OF PIGMENTS?

Insoluble colourants in fine powder form are called pigments. The colour of pigments is altered by selective wavelength absorption through light transmission. They can either be organic or synthetic. They function as colouring agents in several sectors and offer protection from rust and corrosion. The unique qualities that make pigments, often referred to as colourants, the ideal colouring agents, are contained in them. Moreover, they give materials durability and stability.

It would be great if you did not mix colours and pigments. Both of them are very different. A colourant is stable in its non-liquid form at room temperature and has a high tinting ability. The cost and the way a colourant uses its physical features and properties will determine which one is best for a given application. Corrosion and colourants are where the phrase "rust stimulators and inhibitors" originated. Rust inhibitors have the least corrosive effects, while rust stimulators promote more corrosion. Inert colourants are those that exist between these two groupings. In colourants, selective light absorption occurs. When a colourant molecule is exposed to white light, various absorption processes take place. 

Organic colourants are composed of conjugated systems of double bonds that absorb light. Light absorption takes place by electron transfer in inorganic pigments. The appearance of colourants is affected by the spectrum of the incident light. For instance, a colourant would not appear to have the same colour under sunlight compared to fluorescent lighting. The colour difference will appear because a different range of wavelengths is left to be reflected. The colour, saturation, and other colourant properties depend on other compounds that go along it in products, such as binders or fillers. The most commonly used colourant is a green pigment. The pigment application of the green colour is manifold and is used in various industries and manufacturing units.

Application of Green Pigments 

Plastic Dyes applications and masterbatch

Colourants are substances added to the polymer base to give the plastic its colour. These substances can be either organic or inorganic. Colourants not only give plastics their hues, but they also affect how easily they can be processed, how long they can endure, and how compliant they are. The utility of plastic items can suffer from exposure to natural and artificial light. Therefore, UV protection is required for polymers used in outdoor applications. Green pigments shield things from the sun's damaging rays and other negative consequences. It aids in preserving the vibrant, vivid colour of the items manufactured with green pigment. The goal of transparency in colourants is to minimise the size of the colourant particle size. The size reduction is accomplished by layering around the newly generated particles to prevent crystal formation. For colouring agents that must have great transparency, transparency is advantageous. Additionally, they have the advantage of being spread out easily. A masterbatch is a strong combination created by evenly distributing colours and ingredients.

Utilisation Of Colorants In The Following Masterbatch Types-

White Masterbatch: White masterbatch is used in businesses and production facilities. It is utilised in blow moulding, injection moulding, thermoforming, laminating, coating, pipe, protective film, and fibre and non-woven materials.

Black Masterbatch: In polypropylene, polyethene, and universal carrier systems utilised in thin films, thick films, and more, a black masterbatch is used.

Color Masterbatch: Plastic resins undergo considerable alterations as a result of colour masterbatches. Additionally, it has numerous uses in industrial machinery for home appliances, textiles for packaging, designers, etc.

Additive Masterbatch: Masterbatches with additives halt degradation. It is utilised in packaging, consumer goods, transportation, agriculture, and building and construction.

Aqueous Ink Applications

The market's safest and most effective inks are aqueous ones. They work perfectly in workplaces, homes, and schools as well as for large-format printing. The highest-quality inks on the market are aqueous. They offer excellent colour depth for everyday use. Writing on adsorbents like cardboard and paper works best with aqueous inks. Aqueous inks are frequently made with blue and green colourants. The green and blue colourants' properties that are listed below aid in the creation of aqueous inks:

• The distribution of small particles

• They exhibit great transparency.

• High-quality purity that is resistant to sunlight is offered by them.

Coating Applications

Pigment Green 7 is mostly used in coatings and building supplies. It is acceptable to employ green colouring. Paint, plastic wallboard, and bricks are all examples of construction products that use the colour green. The green colour is extremely advantageous for usage in construction materials due to its great weather resistance. In the clothes-dying industry, green colourants are used extensively. The UV and solar resistance of the green pigment. The green pigment's lightfastness property makes it difficult for the substance to rapidly lose its colour. Additionally, it is utilised in the ink, varnish, and paint industries. For example, pigment green 7 should be used if you wish to create green ink for a printer cartridge or to reload your ballpoint pen ink. Why? The brightness is not a need for colouring agents, is the answer. They need opacity and toughness. You'll get opacity and durability from the green 7 colourants.

Various Other Uses for the Green Pigment

The Plastic Pigments Manufacturers, a pigment made by the same company. Additionally, it can be used in transparent conductive films, antistatic products, cosmetics, etc. It is simple to dissolve the green colourant with alcohol or water. Additionally, it can be blended with other inorganic colourants, acrylic resin, or any other kind of vehicle to make the colour opaque and durable.

The brightness, concealing ability, and tinting intensity of the green colourant are all quite good. Additionally, it is very resistant to outside weathering and chemical stability. It is particularly useful in many different industries and production facilities due to its excellent motion picture, coating, and adhesive qualities. Without colour, life would be drab and monotonous. It enhances our lives with joy and light and improves their visual appeal!

Conclusion

Different areas of textile dyeing and printing use pigments. It must therefore have some solid standards. Veeraco is renowned for the calibre of its high-performance pigments, which may be employed in a variety of difficult applications, from automotive coatings to fibre-grade masterbatch applications. Customers who buy products using pigments typically do so through stores or Plastic Dyes manufacturers of India. The founding year of Veeraco Colourants Private Limited was 1952. They make, provide, and export a variety of dyes and pigments. They are one of the Top Dyes Manufacturers in India as the years went by and the hard work started to pay off. 

Read More: Dyes and Pigments

Industrial Pigments for Plastics

Plastic Pigments

Pigments, which are made of natural and synthetic materials, are colourants that give materials like paper and plastics their colour. They are not soluble in water or oil. Both pigments and dyes are distinct sorts of colourants, but when it comes to colouring plastics, certain plastic pigments are chosen over dyes, mostly due to their superior fastness properties. 

Chemical substances called plastic colourants are used to colour plastic. These substances express themselves as pigments and colours. Based on the type of polymeric resin that needs to be coloured, the type of colourant is selected. Veeraco Colourants Private Limited has very strict compliance requirements and aligns with innovation and ongoing improvement.

 The Properties of Pigment

Transparency, warping or nucleation resistance, light fastness, Weather-ability or ageing, and warping or ageing resistance are the main performance characteristics of pigments in plastics.

 Weather-Ability and Age

 The useful life of plastic products can be negatively impacted by sunlight exposure and various types of artificial lighting. Therefore, UV protection and weather-resistance pigments are needed for polymers that are regularly used outside.

Utilising outdoor exposure experiments in the relevant climatic regions is the only practical way to evaluate weathering resistance. This is not always possible. Accelerated testing, or CYCLE WOM 119, is a popular substitute.

 Along with the pigment composition and the required fastness standards for the finished product, the light stabiliser system must be taken into account.

 Light Fastness 

 If a pigment has good Light Fastness, it does not necessarily mean that it has good weather-fastness. Light Fastness is a measure of the colour fastness of a plastic article when used in indoor applications (UV light exposure without direct Water contact).

 The choice of pigment for plastics used indoors is influenced by several factors, including polymer class, pigment concentration, Titanium dioxide presence (which typically accelerates fading), The necessary light fastness, and Service circumstances.

 The article's surface, the history of processing heat, and the stabilisation package can all have an impact on pigment performance. In general, inorganic pigments are light-fast than biological pigments.

Nucleation and Warping

The final qualities of a plastic object are determined by the degree of crystallinity and the rate of crystallisation. Particularly in HDPE injection moulding, organic pigments are known to affect these parameters during the cooling phase of plastic production.

Transparency

In most cases, transparency is attained by minimising pigment particle size. This is accomplished by covering the newly generated particles to stop crystal development as soon as possible. Rosin or rosin derivatives are the materials utilised for this coating the most frequently. This has the extra benefit of making high-transparency printing ink pigments more easily disseminated, which is particularly helpful for those pigments.

 Conclusion

Plastic product colours can impact consumers' purchasing decisions and assist build brand identification. Most of the time, consumers who use plastic acquire products from stores that sell them or from plastic dyes manufacturers in India. Veeraco Colourants Private Limited's history dates back to 1952. Various types of dyes and pigments are produced, supplied, and exported by them. As the years passed, the hard effort began to pay off, and today they are one of the top dyes and pigments companies in India. 

 

 

Why is a Pigment distinct from a dye?

Different materials are coloured using both pigments and dyes, but their methods are very, very different. Solubility, or the propensity to dissolve in a liquid, particularly water, is the key. Imagine two glasses of water, one with salt and the other with muck, standing next to each other.

Solubility

The murky water is brown and contains a variety of silt and mud particles suspended in it. If you give it enough time, the particles will eventually fall to the glass's bottom. The mixture is referred to as a suspension.

Grab some salt water now. The salt entirely dissolves in the water after being combined with it. To prevent evaporation and prevent a coating of salt from condensing on the bottom of the glass, cover the glass with a lid. A solution is a name given to this mixture.

Like the dirt in the previous illustration, pigments are tiny colour particles that float in liquids (usually not water, and are called the dispersing agent or vehicle). As opposed to dyes, which are substances that, like the salt in the previous example, dissolve in a medium (such as water) to produce a colourant.

Application

There are more distinctions between pigments and dyes. Both pigments and dyes have very different methods for actually adhering to the substance. While pigments are painted onto the surface, dyes are absorbed into the material and form a chemical bond.

To form a coating on top, the base is coated with the dispersion agent and pigment combination. In essence, the dispersion agent causes it to stick to the surface of the substance.

Instead of being painted on as a layer, dyes chemically attach to a material and really become a part of it. The chemical makeup of the material being dyed and the dye itself determine whether or not the dye will adhere. A mordant is a substance that is sometimes required for a dye to bond.

Additional variations

Pigments are substantially lightfast than dyes in terms of reactivity to light. A dyed object loses its colour when exposed to light, especially sunshine since it causes the molecules' electrical bonds to rupture. As a result, dyed material frequently degrades when exposed to light and can occasionally fade quite quickly. (Although this is also true for some pigments; this is why art museums typically keep their lights low to preserve their paintings.)The majority of the time, dye buyers purchase their goods from shops that sell them or from dyes and pigments companies in India. 

Uses

Dye is typically used in the paper and textile industries. Wood and leather are frequently coloured as well. The same goes for gasoline, lubricating oils, polishes, and waxes. Natural or synthetic dyes that have been deemed safe for human consumption are frequently used to colour food. Contrarily, pigments typically give rubber, plastic, and resin materials their colours.