On May 3, 2018, Alfa Chemistry, a leading chemical company, announced to enlarge its product lines by providing a wide range of dyes to their customers.
Dyes are colored substance because they absorb only some certain wavelengths of visible light and they have an affinity to the substrate to which they are being applied. Dyes are generally applied in aqueous solutions and may require mordant to increase the fastness of the dyes on the fibers. Dyes are generally soluble in water, and some dyes can be made insoluble by adding salts to produce lake pigments.
Dye must meet the following two requirements: First, It should soluble in water, or can be converted into a soluble state during dyeing and have a certain affinity for fibers. Second, the fiber can be colored by dyes and has a certain color fastness after dyeing.
According to the applications of dyes, they can be divided into the following categories:
Acid Dyes: These dye molecules contain sulfonic acid groups or carboxyl groups, which usually exist in the form of water-soluble sodium salts. They are commonly used in the dyeing of fibers such as silk, wool, nylon, and modified acrylic fibers, and use neutral to acidic dye baths.
Azoic Dyes: Azoic dyeing is a technique that produces insoluble azo dyes directly on or within fibers. This is accomplished by treating the fibers with diazoic and coupling components. By adjusting the bath conditions, the two components react to produce the desired insoluble azo dye.
Basic Dyes: Basic dyes are water-soluble cationic dyes and they are mainly used for the dyeing of acrylic fibers. They also can be used to dye wool, silk and paper.
Disperse Dyes: Disperse dye molecules do not contain water-soluble groups, so they have poor solubility in water. They are commonly used to dye polyester, and they can also be used to dye nylon, cellulose triacetate and acrylic fibers. When dyeing, the dyes are dispersed into ultra fine particles by dispersants and then dyed by the fine particles.
Reactive Dyes: Reactive dyes contain reactive groups in their molecular structure. When dyeing, they can form covalent bonds with hydroxyl groups or amino groups in the fiber molecules, that’s why they are called reactive dyes. And the covalent bonds of reactive dyes with natural fibers make reactive dye the most permanent dye. Reactive dyes are the best choice for dyeing cotton and other cellulosic fibers in homes or art studios.
Sulfur Dyes: Sulfur dyes are insoluble in water. Dyeing is achieved by heating the fabric in a solution of organic compounds and sulfides or polysulfides. Sulfur dyes are cheap dyes used to dye cotton with dark color.
Vat Dyes: Vat dyes are usually insoluble in water and it can not dye the fibers directly. Dyeing is achieved by reduction of alkaline liquor to produce the water-soluble salt of the dye, which has an affinity to the textile fiber. The color of denim is from the original vat dye – indigo.
“In consideration of the increasing demanding for dyes, we decide to launch dyes products to enlarge our product lines this time. A wide range of dyes such as acid dyes, azoic dyes, basic dyes, disperse dyes, reactive dyes, cationic dyes, direct dyes, neutral dyes, solvent dyes, coupler and pigments are for sale on our website,” said Dr. Brenda Randy, the marketing manager of Alfa Chemistry.
About Alfa Chemistry
Alfa Chemistry offers an extensive catalog of building blocks, reagents, catalysts, reference materials, and research chemicals in a wide range of applications. It also provides analytical services and laboratory services to the customers. Products listed on the website are either in stock or can be resynthesized within a reasonable time frame. In stock products can be shipped out within 3-5 business days upon receipt of customers’ purchase order.
More than 300 different organizations from at least 40 countries worldwide have used Alfa Chemistry’s products and services since its inception. A large part of Alfa Chemistry’s customers are pharmaceutical and biotechnology companies, including Pfizer, Novartis, Merck & Co., Johnson & Johnson, AstraZeneca, and Bayer. Alfa Chemistry is also a preferred partner for many universities and non-profit institutes.
Company Name: Alfa Chemistry
Contact Person: Tylor Keller
Email: Send Email
Address:2200 Smithtown Avenue, Room 1 Ronkonkoma
State: New York 11779-7329
Country: United States