Coating compositionf or optical fibers
A technology of optical fiber and composition, applied in the direction of fiber mechanical structure, coating, thin material processing, etc., can solve the problems of poor adhesion, attenuation of optical fiber, delamination, etc., to eliminate delamination phenomenon and improve service life. Effect
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Embodiment 1
[0081] Example 1 - Preparation of Coated Fibers
[0082] Using the ingredients listed in Table 1, various primary coating compositions were prepared. The components are added to a heated tank and blended at a temperature in the range of about 40-70°C, preferably about 50-60°C. Blending is continued until the components are thoroughly mixed into a composition having a viscosity suitable for standard commercial coating operations, typically about 50-150 poise at a temperature of about 25°C, or about 5-150 poise at a coating operating temperature. 15 moors.
[0083] Oligomer Monomer Component Adhesion Promoter
(wt%) (wt%) Photoinitiator (wt%) Antioxidant (pph) (pph)
A
CN986 SR335 Irgacure 184 - -
74% 20% 6%
B
CN986 SR335 Irgacure 184 - 3-methacryloxypropyltrimethoxysilane
74% 20% 6% 1.0pph
C
CN986 SR335 Irgacure 184 - 3-Acryloyloxypropyltrimethoxysilane
74% 20% 6% 1.0pph
D
CN...
Embodiment 2
[0100] Example 2 - Water Immersion Evaluation of Delamination or Microdelamination of Fibers A-L
[0101] After aging for about 2 to 3 weeks, fibers A-L were soaked in water at room temperature and a temperature of about 65°C for 14 days, 30 days or 60 days. The length of the fiber to be tested during immersion must be long enough to ensure that the end of the fiber is above the surface of the immersion water, thus limiting the radial penetration of water into the coating (ie no penetration at the end of the fiber). After a predetermined soak time, a 10 cm section of each optical fiber sample was examined with a microscope at 100x magnification for delamination (ie, a large area separation between the primary coating and the glass fiber) or microdelamination ("MD"). MD is a relatively small delamination with a maximum dimension of about 1 mm. The frequency and size of MD occurrences were recorded, ie the number of MDs and the largest dimension (mm) on the 10 cm section detect...
Embodiment 3
[0107] Example 3 - Peel Force Test of Soaked Fibers
[0108] The peel force test is performed in accordance with FOTP-178 (herein incorporated by reference), wherein the coated fibers are placed in a load cell and then peeled at a specified rate under specified environmental conditions. For commercial application, the measured peel force must be between about 0.2-2.0 lbf (0.89-8.9 Newtons). Peel force tests were performed on dry and wet fibers. The peel force test was performed after soaking wet fibers in water for 14 days at room temperature. The results of the peel force test are listed in Table 3.
[0109] Dry SF(1b) SF(N) Confidence(N) Wet SF(1b)SF(N) Confidence(N)
[0110] All compositions exhibited suitable peel forces when wet and dry, meeting Bellcore specifications. Comparing Fiber B-I, which contained the same primary coating formulation except for a specific adhesion promoter, it was evident that the two adhesion promoters least affected by water were 3...
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