Optical brightening agent can be divided into the following categories according to their application, plastic optical brightening agent,printing and dyeing optical brightening agent,paint ink optical brightening agent,washing special optical brightening agent .

As the professional optical brightening agent manufacturer in China,Raytop chemical will explain details about the different items of optical brightening agent.     

Types of optical brightening agent

• 1. Stilbene type: used in cotton fiber and some synthetic fiber, papermaking, soap making and other industries, with blue fluorescence.

• 2. Coumarin type: with the basic structure of coumarin ketone, it is used for celluloid, PVC plastics, etc., and has strong blue fluorescence.

• 3. Pyrazoline type: used for wool, polyamide, acrylic and other fibers, with green fluorescent color.

• 4. Benzoxynitrogen type: used for acrylic fiber, PVC, polystyrene and other plastics, with red fluorescence.

Types of optical brighteners use

Optical brightener for plastics

Optical brightener for textile

Optical brightener for polyester

Optical brightener for ink

Optical brightener for nylon

1,Types of optical brightening agent for plastics     

1),Type of Optical Brightener OB-1

Chemical name: stilbene dibenzoxazole

Molecular formula: c28h18n2o2

Molecular weight: 414.4547

CI:236

CAS:1533-45-5

Properties: Optical Brightener OB-1, light yellow powder, insoluble in water, odorless, stable performance;

The maximum absorption wavelength is 374 nm, and the emission wavelength is 434 nm.

Technical conditions:

Standard: Hg / t3703-2016

Appearance: light yellow powder

Color light: blue light or blue violet light

Melting point: 350-355 ℃

Content: ≥ 98%

Fineness: ≥ 200 mesh

UV absorption: ≥ 2000

Volatile matter: ≤ 1%

Ash content: ≤ 1%

Scope of application:

1. Optical Brightener OB-1 is suitable for whitening polyester fiber, nylon fiber, polypropylene fiber and other chemical fibers.

2. It is suitable for whitening and brightening of polypropylene plastics, rigid PVC, ABS, EVA, polystyrene, polycarbonate, etc.

3. It is suitable for the conventional polymerization of polyester and nylon.

4. It is especially suitable for whitening of plastic products formed at high temperature.

2),Type of Optical Brightener OB

Molecular formula: c26h26so2n2

Molecular weight: 430.5618

CI:184

CAS NO:7128-64-5

Appearance: light yellow powder

Purity ≥ 99.0,

Melting point: 196-203 ℃

Decomposition temperature: over 220 ℃

Standard: Hg / t4707-2014

Color light: bright blue light

UV absorption: 1100-1200

Volatile matter: ≤ 0.2%

Ash content: ≤ 0.3%

Transmittance: 450nm ≥ 96%, 500nm ≥ 97%

Fineness: through 100 mesh

General solvent: methanol and chloroform

Performance characteristics:

1. Appearance: light yellow powder, tasteless

2. Good light transmittance, suitable for transparent plastic products, paint and ink industry

3. Small toxicity, adapt to environmental requirements, light color, pure shade, moderate price.

4. Solubility: insoluble in water, soluble in alkanes, mineral oils and common organic solvents.

5. Maximum absorption wavelength 357nm (ethanol)

6. The maximum emission wavelength is 435 nm    

Scope of application:

1. Injection molding, film blowing, color masterbatch, PVC building materials

2、PE、PP、PS、ABS

3. Transparent plastic products, hot melt plastics

4. Paint, ink, wallpaper, paint

5. Cellulose acetate, polyvinyl chloride, polystyrene, polypropylene, polyethylene, acrylonitrile, butadiene, styrene copolymer, styrene, acrylonitrile copolymer, styrene, butadiene copolymer, cellulose acetate, polyamide (PA), polymethylmethacrylate (PMMA), acrylic resin, polyester fiber (polyester)

6. Food containers, children's toys

3),Type of Optical Brightener fp-127

Chemical name: stilbene dibenzoxazole

Molecular formula: c30h26o2

Molecular weight: 418.5262

CI：378

CAS: 40470-68-6

Properties: Optical Brightener agent fp-127 light yellow crystalline powder is insoluble in water, odorless and stable;

The maximum absorption wavelength is 368 nm and the maximum emission wavelength is 436 nm.

Technical index:

Standard: Hg / T 3725-2012

Appearance: light yellow crystalline powder

Color light: blue violet light

Melting point: 219-221 ℃

Content: 99%

Ash content: ≤ 0.5%

Volatile matter: ≤ 0.5%

Acid and alkali resistance: strong acid and alkali resistance

Scope of application:

Optical Brightener agent fp-127 has good whitening effect on all kinds of plastics and plastic products, especially for PVC plastic products. It is especially ideal for whitening and brightening of artificial leather and leather products, and has the advantages of no yellowing and no fading after long-term storage.

4),Type of Optical Brightener KCB 

Chemical name: 1.4-bis (benzoxazolyl-2-yl) naphthalene

Molecular formula: c24h14o2n2

Molecular weight: 362

CAS：5089-22-5  

Technical conditions:

Standard: Hg / T 5097-2016

Appearance: yellow green powder

Color light: bright blue white light

Melting point: 210 ℃～ 212 ℃

Solid content: ≥ 98%

Fineness: through 100 mesh

UV absorption: ≥ 500

Volatile matter: ≤ 0.5%

Ash content: ≤ 0.5%

Scope of application:

The Optical Brightener KCB is mainly used in the whitening of EVA foam, shoe materials, synthetic fibers and plastics. It can be used in the whitening of plastic film, compression molding materials and injection molding materials. It can also be used in the whitening of polyester fiber, dyes and natural paint.

2,Types of optical Brightener agent for printing and dyeing

1),Type of  Optical brightner agent 4BK (red, blue)

CI:113

CAS NO:12768-91-1

Appearance: light yellow uniform powder

Purity: 99%

Application: it is suitable for whitening cotton and blended fabrics, with strong fluorescence, positive color and higher whiteness, and good resistance to weak acid, alkali, perborate, hydrogen peroxide and so on. The solubility dispersion of Optical brightner agent 4BK is very good. The solubility in water is higher than that of whitening agent VBL and 31 ℃, and can be used by hot water to about 10% suspension. When preparing solution, it is advisable to use it with the solution. The solution should avoid direct sunlight.

Performance advantages: Optical brightner 4BK is most suitable for pure cotton, giving full play to the characteristics of auxiliaries, making the dyed materials have bright color light and have very good visual effect.

2),Type of Optical brightner agent mst-l

CI:353

CAS NO:68971-49-3

Molecular formula: c40h38o22n12s6na6

Molecular weight: 1368

Product quality index:

1. Appearance: amber liquid

2. Color light: dilute solution with strong white blue fluorescence.

Product features:

1. Liquid brightener SBL is a derivative of stilbene hexasulfonic acid, which is a compound of pure product and synergist.

2. Miscibility: water can be diluted to any concentration.

3. Ionic: anionic.

4. Low temperature stability: long time storage - 7 ℃ will not appear the frozen body, below - 9 ℃ if appear the frozen body, slightly heating thaw, the effect is not reduced.

5. Fastness: This product has fastness to light, acid and alkali.

6. It shows high whiteness in pigment coating method and sizing press method.

7. Compared with other fluorescent dyes, the fluorescent extinction phenomenon is less.

8. In color coating, it has strong compatibility with other drugs.

9. When the weight of pigment is more than 2%, it shows high whiteness.

10. Because of its low affinity with pulp, it is not suitable for whitening by beating.

3，Type of Optical brightner agent for Textiler 

1）Type of Optical brightener agent SWN

C.I.：140

CAS NO.:12224-03-2

Application:

The Optical brightener agent SWN can be dissolved in ethanol and glycol, acidic aqueous solution, resin, varnish and some organic solvents, but its solubility in water is only 0.006%. The commercial products are usually made by salting with sulfuric acid or hydrochloric acid, or mixing with organic acids (such as tartaric acid, citric acid and oxalic acid), or adding solubilizing substances to improve the solubility and dispersant, It can be applied. Add it to textiles to make it red and purple.

Optical brightener agent SWN is used in cotton textiles, which can effectively improve the appearance whiteness. This product is not suitable for bathing with sodium chlorite.

2) Type of Optical brightener agent CXT

C.I.:71

CAS NO.:16090-02-1

Molecular formula: c40h38n12o8s2na2

Relative molecular weight: 924.93

Maximum UV absorption wavelength: 350nm

Executive standard: hg/t3675-2007

Quality index:

Appearance: white or light yellow uniform powder

Whitening strength (standard): 100 force points

Moisture content: < 5.0%

Fineness (pass 425 μ Residual content of m-pore sieve: < 5.0%

Performance characteristics: Optical brightener agent CXT is a kind of excellent fluorescent brightener which is considered to be used as detergent at present. Many properties of morpholine group were introduced into the whitening agent. For example, acid resistance increases the resistance to perborate, which is also suitable for the whitening of cellulose fiber, polyamide fiber and fabric. The ionization of Optical brightener agent CXT is that the fluorescent color of anion is blue light. The chlorine bleaching resistance of CXT is better than that of VBL, and the pH of the best dye bath is 7-10, and its fastness to sun is 4.

Scope of application:

1. It is suitable for detergent, and is added into synthetic detergent, soap and soap, which can make its appearance white and pleasing to the eyes, and crystal clear and full.

2. It is used for whitening cotton fiber, nylon and other fabrics; It has excellent whitening effect on artificial fiber, polyamide and vinylon; It also has a good whitening effect on protein fiber and amino plastics.

4,Types of Optical brightener agent for paint, ink and latex paint

1) Type of Optical brightener agent OEF

Chemical name: 1.4-bis (4-tert-butyl-1-phenylpropioxazolyl) thiophene)

Molecular formula: c26h26so2n2

C.I.:184

CAS NO.:7128-64-5

Molecular weight: 430575

technical conditions

Appearance: white powder

Color light: bright blue fluorescence

Melting point: 196-203 ℃

Solid content: ≥ 98.7%

Fineness: through 300 mesh

Uses: mainly used for whitening products of polystyrene, polyethylene, acrylonitrile / butadiene / styrene copolymer, styrene / acrylonitrile copolymer, styrene / butadiene copolymer, cellulose acetate, polyamide (PA), polymethylmethacrylate (PMMA), acrylic resin, amino resin and phenolic resin, as well as for daily organic paint, oil paint and other products Ink has special effects.

2) Type of Optical brightener agent ST-1

Structure type: stilbene derivative

C.l:140

Appearance: light yellow green powder

Color light: blue violet light

Active ingredient: ≥ 99%

Extinction coefficient: ≥ 780

Performance characteristics:

It can be used in the same bath with anionic surfactants or dyes, nonionic surfactants and hydrogen peroxide. At the same dosage, the whiteness is 3-5 times higher than VBL and DMS, but the water solubility is almost the same as VBL and DMS. Compared with CBS-X, its water solubility is slightly poor, but CBS-X can be taken away with water, and the paint is easy to migrate and yellowing when it is dry. This product effectively solves the problems of temperature resistance, weather resistance, yellowing resistance and migration resistance of fluorescent whitening agent in water-based paint and water-based paint, and can keep the whiteness of paint and paint as new as ever after construction.

Scope of application:

Used for acrylic latex paint, acrylic and polyurethane synthetic water-based wood paint, polyurethane water-based paint, stone paint, waterproof paint, multicolor paint, dry powder mortar, dry powder putty, building glue, water-based color paste and other water-based coating products with various process formulas, small addition, excellent whitening, brightening and brightening effect! At present, it is the most suitable fluorescent whitening agent for waterborne coatings in China and the world.

  Type of Optical brightener agent LIST

There are many types of optical brightening agents. The above table basically shows all types of optical brightener. Optical brightener is widely used in various fields such as plastics, textile, papermaking and rubber. So there are a lot of different types of optical brighteners.