Fabricating of SUMIKASUPER LCP

Adhesion

SUMIKASUPER LCP can be bonded using the off-the-shelf adhesives (Table 3.3), without requiring any particular surface treatment. The surface bond retains its effective strength, even after being heat aged at a temperature of 250 deg C. Moreover, although crystalline resins, such as PPS, may experience "warpage" if the curing temperature is increased, SUMIKASUPER LCP experiences almost no such "warpage", even if cured at relatively high temperatures of between 120-150 deg C. This characteristic allows for shortened bonding times.

Table 1 : Adhesive Strength Given by Ordinary Adhesives Sold on The Market (Unit : MPa)

  Adhesive
TB2234D
(Three Bond)
Sumimac ECR-9173K
(Sumitomo Bakelite)
Amicon A164-1
(Grace Japan)
Amicon A316BP
(Grace Japan)
After
hardening
250 deg C,
1hr
Heat aging
230 deg C,
1min
IR reflow
After
hardening
250 deg C,
1hr
Heat aging
After
hardening
250 deg C,
1hr
Heat aging
After
hardening
250 deg C,
1hr
Heat aging
E5008 9.2 3.0 9.2 9.1 3.8 8.6 4.5 9.1 4.2
E6008 7.7 2.8 7.8 8.8 3.5 10.7 3.8 8.5 3.9
  Adhesive
Technodyne AH 7052T
(Taoka Chemical)
Technodyne AH 6072K
(Taoka Chemical)
Technodyne AH 062K
(Taoka Chemical)
After
hardening
250 deg C,1hr
Heat aging
After
hardening
250 deg C,1hr
Heat aging
After
hardening
250 deg C,1hr
Heat aging
E5008 6.2 4.6 6.7 4.3 6.6 3.8
E6008 7.0 4.4 6.1 4.2 5.6 5.0

Method of Measuring Bond Strength

  • Test Specimens
    ASTM No.1 test specimens (3.2mmt)
  • Test Method
    The adhesive is applied to the test specimens, which are then pressed together to overlap and create a bond10mm in length. The bonded section is then cured in a hot air convection oven.
  • Measurement of Bond Strength
    The shear strength is measured at a tensile rate of1.67x10-4m/s.
Figure : Method of Measuring Bond Strength

Ultrasonic Welding

All grades of SUMIKASUPER LCP can be welded with Ultrasonic Welding (Table 2). Changes to the strength of the bonded surface are minimal, even after being heat aged at a temperature of 250 deg C.

Table 2 :
Welding Property by Ultrasonic Welder (Unit : N)
  Welding strength
Welding strength
After welding
250 deg C,1hr
thermal aging
E5008L 650 570
E5008 510 400
E4008 460 460
E6008 740 740
E6006L 710 650

Method of Measuring Weld Strength

  • Test Specimens
    Two test specimens with dimensions of 12.7x78x1.6mmt
    (One of the test specimens possesses a protruding section, as shown in the accompanying figure.)
  • Welding Procedure
    The test specimens are positioned as depicted in the accompanying figure. Ultrasonic excitation is then performed for 0.6 - 0.8 seconds under the following conditions: frequency of 19.5 kHz; amplitude of 34μm and load of 176.4N.
  • Measurement of Weld Strength
    The shear strength is measured at a tensile rate of 1.67x10-4m/s.
Figure : Method of Measuring Weld Strength
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