2,2-Bis(bromomethyl)propane-1, 3-diol /Dibromoneopentyl Glycol (DBNPG)（Cas:3296-90-0)

♦Brief  introduction

2,2-Bis(bromomethyl)propane-1,3-diol /Dibromoneopentyl Glycol (DBNPG) is a reactive

flame retardant used in polymer materials such as rigid ammonia foams, resins, and coatings.

 

♦ Application

 

1. Flexible Polyurethane Foam.

DBNPG can be used with polyether polyol, isocyanate and other components to formulate

flexible polyurethane foam. It can inhibit the combustion of the foam, improve its fire resistance,

and meet the fire retardant requirements of the furniture and automobile interior industries.

Usually DBNPG is used in the range of 5-15%, and can be used in synergy with other co-effective

flame retardants.

 

2.Rigid Polyurethane Foam.

DBNPG is also suitable for rigid polyurethane foam, such as building insulation boards,

refrigerator insulation, etc. It plays an important role in the foam system.It plays an important

flame retardant role in the foam system and can significantly improve the flame retardant rating

of the foam. The amount of DBNPG is usually around 5-15% for different applications.

 

3. Polyurethane coatings and adhesives.

DBNPG can also be used in polyurethane coatings and adhesives formulations to improve

the flame retardancy of the coating or bonding layer.In these applications, the amount of

DBNPG used is typically low, around 1-5%. Overall, DBNPG is a very effective flame retardant

for polyurethanes, both for flexible and rigid foams, as well as for coatings and adhesives.

Reasonable selection of DBNPG dosage and formulation is very crucial to improve the safety

of polyurethane materials.

 

♦ Manufacturing technique

 

 & Raw material preparation and pre-reaction

The main raw materials are neosorcinol and bromine

 

&  Bromination reaction

Bromination reaction is carried out between neosho-diol and bromine in a suitable solvent

Note the following details

 

*  The reaction temperature is one of the key factors and needs to be carefully optimized experimentally

to achieve the highest reaction conversion and selectivity. Usually between 50-70°C has a better reaction

effect.

 

* The reaction time also needs to be precisely controlled and is usually in the range of 2-4 hours.

Excessive reaction time may lead to an increase in side reactions and affect the purity of the product.

 

*  The choice of solvent is also very important, need to consider the solubility, boiling point, ease of separation

and other factors. Commonly used solvents include dichloromethane, ethyl acetate and so on.

to form dibromo neosho-diol

 

*  The type and amount of catalyst can significantly affect the rate and selectivity of the reaction.

The use of Lewis acids such as FeCl3 and ZnCl2 as catalysts can be tried.The catalyst dosage was

optimized by orthogonal test or one-way test, which was generally in the range of 0.5-2 mol%.

& Separation and purification of products

 

After the reaction, the reaction mixture needs to be separated and purified to remove impurities

and unreacted substances.Usually, extraction, distillation, column chromatography and other

methods are used for separation and purificatio

 

♦ Inspection Method

Physical Appearance: Visual inspection

Purity Analysis: Gas chromatography (GC)

Acid Value: Potentiometric titration

Water Content: Moisture analyzers

Refractive Index: Refractometer

Density: Density meter

Performance comparison

 

♦ Storage:

Store at room temperature, away from direct sunlight