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Brush Bond is a Epoxy Resin based system for brush making industry. It is an excellent replacement of traditional bonding agents and gives superior quality of brushes and user friendly production system.
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SYSTEM FOR BRUSH INDUSTRY:
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System code
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Resin viscosity
(cps at 25ºc)
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Hardener viscosity
(cps at 25ºc)
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Mixing ratio
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Pot life
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Remark
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System IA
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500-800
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10-20
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100/10
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40 min
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Silica powder
must be used
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System IIB
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2500-3500
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10-20
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100/10
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30 min
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Silica powder
can be used
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System IIIC
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1800-2000
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10-20
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100/10
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15 min
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Silica powder
Is not
recommended
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System IV D
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1500-2000
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10-20
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100/10
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12 min
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Silica powder
Is not
Recommended
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System VE
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45K-55K
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40K-50K
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100/100 by
volume
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3-4 hours
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Thinner
methanol can
be used in
equal quantity
of resin
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System VI F
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25K-35K
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20K-30K
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100/100 by
volume
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2-3 hours
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Thinner
methanol can
be used in
equal quantity
of resin
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System VIII H
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800-1000
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12K-20K
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100/50
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40-50 min
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Good system for
nylon bristles
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PROCEDURE TO USE:
Take 100 ml of resin in a beaker and equivalent quantity of hardener in a separate beaker; pour both into a mixing vessel thoroughly. The pouring of mix is similar to shellac (burning is not required in case of resin and hardener system) only single pouring is required in all brushes. After pouring mixture leave the brushes overnight for curing. The system will get partially cured in 4-6 hours. Depending upon the room temperature (and the system used) after 4 hours. Of mixing nailing of brushes can be done by hammering. After 24 hours of curing nailing of brushes become difficult, drilling will have to be done before nailing of the brushes.
PRECAUTIONS:
Do not mix more than 400gm at a time, use the mix within half an hour, use of silica powder is to increase the viscosity of mix, ratio of which is different for different type of bristles and mesh size of powder.
Suggested ratio of silica powder is 30-35gm per 100gm of resin.
Nailing is must in thinner based systems.
System IV D is generally used by those manufacturers who are making machine cleaning brushes.
System IA & II B can also be used for electric insulating applications. The electrical insulating properties of these systems are as under:
AFTER CURE PROPERTIES
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PROPERTY
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METHODS
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UNITS
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VALUE
SystemIA SystemIIB
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Tensile strength
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VSM77101
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Kg/mm²
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4.3-5
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4.3-5
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Compressive strength
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VSM77102
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Kg/mm²
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9-10
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9-10
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Flexural strength
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VSM77103
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Kg/mm²
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5-6
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5-6
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Impact strength
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VSM77105
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Kg.cm/cm²
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2.5-4
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2.3-3.2
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Marten’s HDT
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DIN53458
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ºc
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60-62
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55-60
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Shore hardness
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DIN53505
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Shore D
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75-80
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75-80
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Vol. resistivity
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VDE0303
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Ohm.cm
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10¹²
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10¹²
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Module of elasticity
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VSM77111
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Kg/mm²
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800-820
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750-780
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Thermal stability
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ºc
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140ºc
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150ºc
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Dielectric strength
at RT
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Kv/mm
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21
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21
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Dissipation factor
At 25ºc
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KHZ
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tanδ
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0.018
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0.018
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