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Flame Retardant Formulations of Long Glass Fiber Reinforced Polypropylene

Views:4     Author:Vera     Publish Time: 2018-12-17      Origin:Site

Flame Retardant Formulations of Long Glass Fiber Reinforced Polypropylene


Bromine/ antimony flame retardant LGFPP

 

Beijing Aerospace Kane Chemical Industry and others use Octabromodiphenyl ethane (ODOPE) and Sb2O3, and add expandable graphite (EG) to produce flame retardant LGFPP.

 


1. Formula


Table 3   Component mass fraction of EG synergistic ODOPE flame-retardant LGFPP (%)

 

Sample number

PP

GF

ODOPE

Sb2O3

EG

1#

70

30

0

0

0

2#

53

30

14

3

0

3#

53

30

13.2

2.8

1

4#

53

30

12.4

2.6

2

5#

53

30

11.5

2.5

3

6#

53

30

10.7

2.3

4

7#

53

30

9.9

2.1

5



2. Process

 

The PP, ODOPE, Sb2O3, EG was added to the high speed mixer in a certain proportion, and then added to the twin-screw extruder (temperature 250 ℃, screw speed 300r/min) for melt compounding; then enters LGF impregnation mould (temperature 260 ℃). The LGF is dispersed, fully impregnated, pulled out by die traction, water-cooled, air-dried, and granulated, finally the flame-retardant LGFPP particle is obtained, then it will be injected into samples.


3. Flame retardant effect

 

Table 4      LOI and vertical combustion grade of sample 1#~7#


Formula

LOI / %

vertical combustion grade

1#

20.0


2#

23.6

V-0

3#

23.7

V-0

4#

24.0

V-0

5#

24.7

V-0

6#

23.2

V-1

7#

22.9

V-2



4. Other performance changes


Table 5    MFR and mechanical properties of sample 1#~7#

 

Item

Sample number

1#

2#

3#

4#

5#

6#

7#

MFR / (g·10min-1)

24.2

38.5

36.7

34.3

31.8

30.6

29.2

Tensile strength / MPa

94.7

85.4

84.2

81.5

80.9

78.5

76.1

Bending strength / MPa

139.2

134.3

131.4

129.9

127.8

125.3

122.5

notch impact strength / (KJ·m-2

16.8

15.2

14.9

13.2

10.5

9.4

7.7


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