Flame Retardant Emulsions WACKER VINNOL CEN 2752

 

WACKER VINNOL CEN 2752 is an emulsion technology based on the copolymerization of vinyl chloride and ethylene. Due to the high limiting oxygen index of the vinyl chloride-ethylene copolymer, this means that the polymer itself is a flame-retardant material. At the same time, due to the high content of elemental chlorine in the emulsion, the elemental chlorine traps the hydrogen-bonded radicals generated during combustion in a gas-phase environment, thereby reducing the production of flammable gases. Flame retardant coatings formulated with WACKER VINNOL CEN 2752 water-based emulsions are self-extinguishing.

 

 

I. Product Description

VINNOL® CEN 2752 is a plasticizer-free and self-crosslinking polymer dispersion of vinyl chloride and ethylene copolymers.

II. Applications

VINNOL® CEN 2752 is an ideal binder for soft nonwoven fabrics and knitted wool, as well as a coating and finishing agent for woven and knitted products. Notable features are good adhesion to cellulose and synthetic fibers and excellent wet strength. High-frequency welding and heat sealing are possible according to VINNOL® CEN2752.

VINNOL® CEN2752 coating has good adhesion to PVC foil and good heat resistance. Therefore, VINNOL® CEN2752 can be used to bond PVC to cardboard, paper and fiber materials.

Due to the high chlorine content of the alkaline polymer, VINNOL® CEN2752 is particularly suitable as an adhesive for flame retardant treatments. However, since the chlorine content is generally not sufficient to ensure that all textiles are completely flame retardant, it should be used in combination with other flame retardants such as antimony oxides, phosphate esters or aluminum hydroxide. The type and grade of flame retardant should be selected based on the textile and an appropriate combustion test.

Cross-linking of VINNOL® CEN2752 occurs at temperatures above 130°C, but optimum durability is only achieved at 150°C. The pH of VINNOL® CEN2752 is usually sufficient for optimum cross-linking, but in special cases the addition of 0.1-0.3% diammonium phosphate or citric acid can improve the process.

III. Processing

1、Polymer

    VINNOL® CEN2752 can be mixed with most VINNAPAS® dispersions and many other aqueous polymer dispersions at various ratios. However, storage tests should always be performed to check for compatibility of dispersion. If a harder feel is desired, VINNOL® CE35 should be blended with VINNOL® CEN2752.

2. Flame retardants

    In our experience, suitable flame retardants are antimony pentoxide, such as NYACOL® A1530 or antimony trioxide. Phosphate ester-based systems or combinations of phosphorus and nitrogen-containing compounds and aluminum hydroxide can also be used. The type and grade of flame retardant depends on the textile being used and the degree of flame retardancy required.

3. Fillers and pigments

    VINNOL® CEN2752 is compatible with all commonly used mineral fillers (gypsum, dolomite, etc.). They can dry out the product, but the addition of wetting agents helps to disperse them and improve the storage stability of the compound. It should be noted that if chalk is used, it will interfere with the cross-linking of the polymer and reduce the flame retardant properties. The effectiveness and compatibility of the chosen formulation should always be checked.

4、Thickening

    Suitable thickeners such as polyvinyl alcohol, HDK, cellulose derivatives and bentonite. The level of addition depends on the desired viscosity. When using alkali-soluble thickeners, only ammonia should be used to adjust the pH so as not to interfere with the cross-linking of the polymer.

 

 

 

Product data

 

 

Technical parameters Test methods Numerical values

 

Solids content DIN EN ISO 3251 49 - 51 %

 

Viscosity, kinetics DIN EN ISO 2555 50 - 250 m Pa.s

 

pH DIN/ISO 976 6,0 - 7,5

 

 

General properties Test methods Numerical values

 

Density DIN EN ISO 2811-3 approx. 1,11 g/cm³

 

Minimum film-forming temperature DIN ISO 2115 5 °C

 

Frost resistance Special method Freeze-thaw avoidance

 

Main particle size Special method 0,2 µm

 

Protective colloid/emulsifier systems

Surfactants

 

Compatibility with fillers Special method Good

 

Appearance

Transparent

 

Film-forming surface

Slight dry tackiness

 

Tensile strength DIN EN ISO 527-3 approx. 5 N/mm2

 

Elongation at break DIN EN ISO 527-3 approx. 1400 %

 

Glass transition temperature Special method approx. 10 °C