KR900006276B1 - Resin composite - Google Patents

Abstract

An optical fiber is coated with a first layer of resin (I) having negative linear expansion coefft. and a second layer of resin (II) having positive linear expansion coefft. Pref. (I) is composed of highly oriented resin or liq. crystal polymers. The liq. crystal polymers are thermoplastic with linear expansion coefft. of -10-5-105 per deg.C. Pref. (II) has positive linear expansion coefft. of 10-4 per deg.C or less. The resin combination undergoes little distortion with temp. chamge.

Description

Resin composite

1 is a cross-sectional view of an optical fiber core wire coated with the resin composite of the present invention.

2 is a diagram showing temperature characteristics of an increase in transmission loss of an optical fiber core wire coated with a resin composite and an optical fiber core wire coated with a liquid crystal polymer having a negative linear expansion coefficient.

3 is an explanatory diagram of a method for measuring temperature characteristics of increasing transmission loss.

* Description of the main parts of the drawings

1: optical fiber 2: cushion layer

3: liquid crystal polymer 4: resin

The present invention relates to a novel resin composite, for example, used in precision molded parts, heat-resistant deformation parts, optical fiber composites, and the like, to provide a resin composite that hardly undergoes deformation due to temperature changes with respect to other components in the vicinity thereof. It has a wide range of applications.

Most of the resins called general-purpose engineering plastics have a positive linear expansion coefficient, the value of which is larger than 10 ^-40 C ^-1 or more, and fillers such as glass fibers, carbon fibers, or various beads. Even if added or compounded with other resins, the coefficient of linear expansion is only small at 10 ⁻⁵⁰ C ⁻¹ . Although liquid crystal polymers having a coefficient of linear expansion of 10 ⁶⁰ C ^-1 have recently emerged, the coefficient of pick-up of liquid crystal polymers is generally negative and is different from general-purpose resins and compositions other than resins. . Therefore, it is a phenomenon that such resin is used independently in order to utilize the characteristic as the single product.

However, in the general-purpose resin monolithic as described above, since the coefficient of linear expansion is large or negative even if it is small, when the temperature is changed from low temperature to high temperature or from high temperature to low temperature, it causes large deformation in the resin and other components in the vicinity. There was a problem.

The present invention solves this problem and provides a novel and resin composite which hardly deforms the resin and other components in the vicinity even if the temperature change is large.

The present invention is a resin composite having a linear expansion coefficient of −10 ⁵ to 10 ⁻⁵ ° C. ⁻¹ while integrating a resin having a negative linear expansion coefficient α and a resin having a positive linear expansion coefficient α ′, wherein the negative linear expansion coefficient α is A resin composite in which the resin having a high orientation resin or a liquid crystalline polymer is a particularly preferred embodiment of the present invention.

By integrating a resin having a negative linear expansion coefficient α and a resin having a positive linear expansion coefficient α ', a resin composite is formed, and the linear expansion coefficient of the resin composite is -10 ^-5 to 10 ⁵ ° C ^-1 , and the vicinity of the resin composite is With respect to the other components, the resin composite of the present invention exhibits the effect of minimizing the deformation from the outside due to temperature change.

1 is an embodiment of the present invention, where (3) is a liquid crystal polymer having a negative linear expansion coefficient, (4) is a resin having a positive linear expansion coefficient, and (3) and (4) are in close contact to form a resin composite. (1) is an optical fiber, (2) is a cushion layer which protects an optical fiber, In this case, it is another structure near the resin composite of (1).

The coefficient of linear expansion (4), which has a negative coefficient of linear expansion (3), can be sufficiently adhered by covering it one by one, but simultaneously extrudes (3) and (4) in two layers when extruding optical fiber core wires. It is preferable at the point which raises adhesiveness.

As in the first diagram, since the optical fiber is a constituent in the vicinity of the resin composite of the present invention, the resin composite has almost zero strain due to the temperature change with respect to the optical fiber, so that the transmission loss does not increase even with the temperature change.

The above effects and effects of the present invention are considered as follows. Liquid crystal polymers was that linear expansion coefficient is extremely small as ^{-10 5 ~ + 10 -5 ℃ -1} , and also very close to the linear expansion coefficient of 10 ^-7 ℃ ^-1 glass, inde than the coefficient of linear expansion of the glass-defined value, the liquid crystal The expansion coefficient of the polymer is generally negative. For this reason, at a low temperature of -60 ° C, the difference between the positive and negative linear expansion coefficients causes a slight deformation in the optical fiber, and the transmission loss increases in the optical fiber of the liquid crystal polymer coated with negative linear expansion coefficient.

On the other hand, in the resin composite of the present invention in which a liquid crystal polymer having a negative linear expansion coefficient α and a resin having a positive linear expansion coefficient α 'are tightly integrated with each other, a resin having a positive linear expansion coefficient α' is fine with respect to negative linear expansion of the liquid crystal polymer. Since it acts in the direction of positive linear expansion at one level and hardly causes deformation in other components (in this case, optical fibers) in the vicinity of the resin composite, the transmission loss does not increase at -60 ° C in the optical fiber core wire of the resin composite coating. Do not.

As a resin having a positive linear expansion coefficient α ', when a polyamide-based or fluororesin is used at 10 ⁻⁴⁰ ° C.- ¹ or higher of α ′ value, it is thought that the linear expansion of these resins acts at first, but in reality Since the polymer is small in elongation and has a high modulus of elasticity, deformation from a resin having a positive linear expansion coefficient α 'is considered to be extremely small, and there is no problem at all.

테레프탈산부분-

P-하이드로옥시벤조산부분,

로 이루어진 전방향족계 폴리에스테르, 또는 테레프탈산부분과 폴리에틸렌테레프탈래이트부분

로 이루어진 방향족-지방족폴리에스테르와 같은 -5~-8×10^-6℃^-1의 선팽창계수를 가진 열가소성의 액정고분자를 들 수 있다.Examples of the resin having a negative linear expansion coefficient α used in the present invention include aromatic polyesters, aromatic-aliphatic polyesters, aromatic poly (ester-amides), aromatic-aliphatic poly (ester-amides), aromatic polyazomethines, and aromatics. The liquid crystalline polymer like polyester carbonate is mentioned, A preferable example is a 2, 6 naphthoic acid part.

Terephthalic Acid Part-

P-hydrooxybenzoic acid moiety,

Wholly aromatic polyester, or terephthalic acid and polyethylene terephthalate

There may be mentioned a thermotropic liquid crystal polymer having a linear expansion coefficient of -5 ~ -8 × 10 ^-6 ℃ ^-1, such as aliphatic polyester-aromatic consisting of.

Examples of the resin having a positive linear expansion coefficient α 'used in the present invention include polyamides, polyamide elastomers, polyester elastomers, polyurethanes, polyesters, polyethylene, polyvinyl chlorides, polystyrenes, and polyport orcacarbons. In addition to the thermoplastic resin of the resin, a resin crosslinked and cured by heat, light, water, electron beam, etc., such as epoxy polymer, acrylic polymer, etc., and α '' preferably displays a small value of 10 ^-4 ° C ^-1 or less. In particular, thermoplastic resins having a positive linear expansion coefficient of 10 ⁻⁶ to 10 ⁻⁴ ° C. ⁻¹ , thermosetting resins, or liquid crystal polymers are preferable.

Example 1

As a resin composite in which a liquid crystal polymer having a negative linear expansion coefficient α (Vectra A-900, a wholly aromatic liquid crystal polymer) and a resin having a positive linear expansion coefficient α 'are closely adhered to each other, Note) In the temperature range of -60 ° C to + 60 ° C of the optical fiber core wire coated with only the optical fiber core wire (a) and the liquid crystal polymer having a negative linear expansion coefficient? The characteristics are shown in FIG. In the second, circle cloth -0- denotes (a) and black triangle--denotes (b).

Although the optical fiber core wire (B) coated only with the liquid crystal polymer showed a transmission loss increase of 1,0 dB / km at a low temperature of -60 ° C, the fiber core wire (A) coated with the resin composite of the present invention was transmitted. There was no overall increase in loss.

The optical fiber in this embodiment is made of glass or plastic with a diameter of 0.125 mm, and the cushion layer is made of thermosetting silicone or ultraviolet curable resin having a thickness of 0.1375 mm. The thickness of the resin having a negative linear expansion coefficient is 0.25 mm, and the thickness of the number having a positive linear expansion coefficient is 0.15 mm.

Example 2

The self-curing resin is coated on the optical fiber glass of GI type (Gore / clad diameter = 50/125 micrometers).

After extruding the liquid crystal polymer (Vectra A-900) having a negative Sunfeng coefficient (-5 to -8x10 ^-6 deg. C ^-1 ) on an optical fiber element wire of 0,3 mm∮, the positive linear expansion coefficient (1x A modified liquid crystal polymer having a 10 ⁻⁵ ° C. ⁻¹ ) (Unitica LC2010B) was overcoated to prepare an optical fiber core wire having a diameter of 1.2 mm 3. The thickness of the liquid crystal polymer having a positive and negative linear expansion coefficient is 0.225 mm.

The optical fiber core wire measured the change in temperature of the transmission loss at -60 to 80 ° C (measured wavelength λ = 0 85 μm), so that no increase in the transmission loss was observed.

Although the optical fiber is mentioned as an example above, it is a matter of course that the optical fiber is used in the vicinity of the structure which is easy to be influenced by the deformation | transformation from the exterior other than an optical fiber, and has an effect.

As described above, the resin composite of the present invention exhibits deformation due to temperature change with respect to other constituents near the resin composite due to the synergistic effect of the tight integration of a resin having a negative linear expansion coefficient α and a resin having a positive linear expansion coefficient α '. The effect is almost zero, and is particularly suitable for use in a low temperature environment. Therefore, the resin composite of the present invention is very advantageous for use in precision molded parts, heat-resistant deformation parts, optical fiber coating materials, etc., and contributes to improved performance.

In addition, the composite of the present invention may be integrated by using resins each having a coefficient of linear expansion of positive and negative parts alone, or may be integrally combined with each other according to the purpose.

In addition, the linear expansion coefficient measurement in this invention used TMA (Thermal Mechanical Analyzer, manufactured by Rikagaku Denki Co., Ltd., Japan). As conditions, the load 2g, the sample length 20mm, and the temperature increase rate of 1,25 degreeC / min were given.

Vectra A-900: A wholly aromatic polyester which is a copolymer polymer based on a 2.6 naphthoic acid skeleton, a terephthalic acid skeleton and a P-hydrooxybenzoic acid.

Aromatic-aliphatic polyester which is a copolymer polymer which has the basic frame | skeleton of UNICHIKA LC210B P-hydrooxybenzoic acid and a polyethylene terephthalate.

Note) Method of measuring temperature characteristics of increasing transmission loss

의 증가

α를 20℃를 기준으로 측정한다.Using the measurement system as shown in FIG. 3, the temperature characteristic of the increase in transmission loss of the fiber under measurement is increased. That is, light having a wavelength of 0.85 μm of LEC (light emitting diode) stabilized in a constant temperature bath at 20 ° C. is incident on 1 km of a fiber under measurement in a bundle of 2 speeds in a variable temperature bath through a GI dummy fiber (incident power PI) The light emitted from the fiber to be measured is placed in a light receiver via a GI dummy fiber and a light receiving power (Po) is detected in a constant temperature chamber of 20 ° C. using a measuring system that measures the temperature in the chamber 2 at 20 ° C. → 0 ° C. in 2hr steps. 2 cycles of a cycle of 20 ° C.-40 ° C.-60 ° C.-20 ° C.-40 ° C.-60 ° C.-20 ° C. to 1 cycle, and the temperature in the temperature range of -60 ° C. to + 80 ° C. Transmission loss of measuring fiber

Increase

α is measured based on 20 ° C.

Claims (5)

A resin composite characterized by integrating a resin having a negative linear expansion coefficient α and a resin having a positive linear expansion coefficient α '. Parts of the resin having a linear expansion coefficient α, defined linear expansion coefficient α 'a coefficient of linear expansion of a resin integrally with the -10 ^-5 ~10 ^-5 ℃ ^-5 Rohan resin composite. The resin composite according to claim 1, wherein the resin having a negative linear expansion coefficient α is made of a highly oriented resin. The resin composite according to claim 1, wherein the resin having a negative linear expansion coefficient? Is made of a liquid crystalline polymer. 2. The resin composite according to claim 1, wherein a resin having a negative linear expansion coefficient [alpha] and a resin having a positive linear expansion coefficient [alpha] 'are integrated and used as an optical fiber coating material.

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