JP2009116134A - Optical component joining material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical component joining material capable of avoiding generation of connection loss due to intrusion of air bubbles, improving workability during joining, and further, reducing the economic burden. <P>SOLUTION: The optical component joining material comprises a volatile organic solvent containing a catalyst, and a silicone mixture solution prepared by mixing polyorganosiloxane having a plurality of unsaturated groups and polyorganohydrogen siloxane having a plurality of hydrogen atoms bonded to the respective plurality of silicon atoms. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical component bonding material used for optical path connection in the field of optical communication and for compounding optical elements such as lenses and prisms.

  In general, in optical path connection using an optical fiber and optical elements such as lenses and prisms are combined, adhesion using an optical adhesive, physical connection and combination, and the like are performed. In particular, when the position variation at the joint portion greatly affects the optical characteristics, optical components such as an optical fiber and a lens are physically connected and combined using components with a small amount of deformation in the usage environment. In this case, although the position variation at the joint portion can be suppressed, the intrusion of air into the joint portion cannot be avoided, and as a result, the optical characteristics of the optical component may be greatly deteriorated. Therefore, in order to prevent air from entering the joining portion, a joining material is used when the optical component is physically connected and combined.

The use of the bonding material will be described with reference to an application example to a multicore optical fiber connector.
As shown in FIG. 1, a multicore optical fiber connector 1 (hereinafter referred to as a connector) is used for optical path connection by a plurality of optical fibers 2. In the case of this connector 1, a set of ferrules 3 are arranged with their joint surfaces 3 b facing each other, and guide rods 4 are inserted into both guide holes 3 a of each ferrule 3. Thereby, each optical fiber 2 is arrange | positioned coaxially with the corresponding optical fiber 2, and is physically connected. However, with only such physical connection, air enters between the joint surfaces 3b of both ferrules 3, and the air causes a connection loss of several percent. Therefore, as shown in FIG. 2, a bonding material 5 excellent in optical characteristics and non-decomposability is filled between the bonding surfaces 3 b of both ferrules 3 in order to minimize the connection loss due to air mixing. As such a bonding material 5, specifically, optical silicone oil or the like prepared so that the refractive index becomes a desired value is used.

  Since this type of bonding material 5 is in a liquid state, after filling between the bonding surfaces 3 b of both ferrules 3, the bonding material 5 flows out with time, and finally does not exist at the bonding portion of both ferrules 3. In order to solve this problem, Patent Document 1 proposes a method of filling a silicone gel having a very low fluidity and a low crosslink density between the joint surfaces of both ferrules. However, according to the method disclosed in this document, since the viscosity of the silicone gel is high, bubbles mixed during filling are difficult to remove from the bonding material, and there is a possibility that light connection loss may occur due to the bubbles. Patent Document 2 discloses a method in which a silicone gel pad is interposed between the joint surfaces of both ferrules. According to the method disclosed in this document, since the silicone gel pad that is the bonding material is a solid material, the mixing of bubbles in the bonding material can be suppressed, but the mixing of bubbles between the ferrule and the bonding material is avoided. I can't. Therefore, it is conceivable to use a liquid curable bonding material that is liquid at the time of application, cures with time, and finally solidifies. Examples of the liquid curable bonding material include those made of silicone-based, acrylic-based, epoxy-based, urethane-based, cyano-based materials, etc. Among these, light transmittance and environmental resistance are excellent and low. Silicone-based liquid curable materials are very suitable as bonding materials for optical components because of their surface tension and viscosity.

Among silicone-based liquid curable materials, in the presence of a catalyst, a component having an unsaturated group and a component having a hydrogen atom bonded to a silicon atom undergo a hydrosilylation reaction (addition polymerization), and are cured. Liquid silicone materials are known. This addition-type liquid silicone material is not widely used for rubbers, resin moldings, adhesives, potting materials, paints, and the like because it does not generate a reaction product with a curing reaction and is not inhibited by air.
Republished patent WO2001 / 088584 JP-A-10-111429

  By the way, when this addition type liquid silicone material is used as an optical component bonding material, it is necessary to uniformly mix a component having an unsaturated group, a component having a hydrogen atom bonded to a silicon atom, and a catalyst. Therefore, bubbles may be mixed into the material during mixing, in which case the bubbles must be removed from the material. In addition, after mixing both the above components and the catalyst uniformly, an appropriate amount of the mixture is collected and applied to the optical component, so that more material than the actual amount used is required. Therefore, when an addition-type liquid silicone material is used as an optical component bonding material, it is accompanied by a mixing operation, a defoaming operation, etc., and the amount of material used is increased, resulting in a large economical and efficient burden and is extremely difficult to use. It was a thing.

  An object of the present invention is to provide an optical component bonding material that can avoid the occurrence of connection loss due to mixing of bubbles, improve the workability at the time of bonding, and further reduce the economic burden. It is in.

  In order to achieve the above object, an invention according to claim 1 is an optical component bonding material for bonding optical components, and has a volatile organic solution containing a catalyst and a plurality of unsaturated groups. And a silicone mixed solution in which a polyorganohydrogensiloxane having a plurality of hydrogen atoms bonded to a plurality of silicon atoms is mixed.

  A second aspect of the present invention is the first aspect of the present invention, wherein the polyorganosiloxane having a plurality of unsaturated groups has a vinyl-diphenylsiloxane-dimethylsiloxane structure at both ends and is contained in the polyorganosiloxane. The gist is that the ratio of siloxane is set in the range of 1 to 20 mol%.

  According to the present invention, it is possible to avoid the occurrence of connection loss due to mixing of bubbles, to improve the workability at the time of joining, and to provide an optical component joining material that can reduce the economic burden. it can.

An embodiment embodying the optical component bonding material of the present invention will be described.
In this embodiment, the optical component bonding material includes a volatile organic solution containing a catalyst, a polyorganosiloxane having a plurality of unsaturated groups, and a polyorganohydrogen having a plurality of hydrogen atoms respectively bonded to a plurality of silicon atoms. And a silicone mixed solution mixed with siloxane. In the case of this optical component bonding material, first, a volatile organic solution containing a catalyst is applied to the bonding surface of the optical component. Thereafter, since the organic solvent is volatilized, the catalyst remains uniformly dispersed and concentrated on the joint surface of the optical component. By simply bringing a silicone mixed solution into contact with the catalyst, a polyorganosiloxane having a plurality of unsaturated groups and a polyorganohydrogensiloxane having a plurality of hydrogen atoms bonded to a plurality of silicon atoms, respectively, are subjected to addition polymerization. The mixed solution cures over time. As described above, the optical component bonding material is initially in a liquid state, but when the silicone mixed solution is brought into contact with the catalyst, it is cured with time and finally solidified.

  Specifically, a white metal transition catalyst such as platinum, ruthenium, rhodium, or palladium can be used as the catalyst. Of these white metal-based transition catalysts, chloroplatinic acid, its alcohol-modified products, and platinum vinylsiloxane complexes should be used because the hydrosilylation reaction proceeds rapidly when the catalyst and silicone mixed solution are brought into contact with each other. More specifically, a complex solution of platinum and tetravinylsilane, carbonylvinylmethyl, divinyltetramethyldisiloxane or cyclovinylmethylsiloxane, a complex solution of platinum and octylaldehyde / octanol, or the like may be used. preferable.

  The organic solvent that dissolves the catalyst is used to distribute the catalyst uniformly and in a concentrated state on the joint surface of the optical component before contact with the silicone mixed solution. As the organic solvent, any kind of organic solvent can be used as long as it dissolves the catalyst. However, for work reasons such as safety and equipment costs, there are organic solvents that can be volatilized by heating at normal temperature or for a short time. Used. Specific examples of the organic solvent include aromatics such as toluene, ketones such as acetone, halides such as methylene chloride, alcohols such as methanol, and petroleums such as hexane.

  The concentration of the catalyst contained in the organic solution is not particularly limited as long as the catalyst can remain on the joint surface of the optical component, but considering the curing time of the silicone mixed solution and the stability of the organic solution, It is preferably set in the range of 10 ppm to 1000 ppm in terms of platinum. When the concentration of the catalyst is less than 10 ppm, the amount of the catalyst is too small with respect to the coating amount of the organic solution, and therefore, the hydrosilylation reaction cannot sufficiently proceed, which is not preferable. On the other hand, when the concentration of the catalyst exceeds 1000 ppm, the amount of the catalyst is too much relative to the coating amount of the organic solvent.

  The silicone mixed solution is a mixture of a polyorganosiloxane having a plurality of unsaturated groups and a polyorganohydrogensiloxane having a plurality of hydrogen atoms bonded to a plurality of silicon atoms. The polyorganosiloxane is a polymer having a siloxane skeleton, and in the side chain of the siloxane skeleton, an alkyl group typified by a methyl group or an ethyl group, an aryl group such as a phenyl group, or a substituted alkyl group such as a chloromethyl group have. In this embodiment, the polyorganosiloxane has a plurality of unsaturated groups at the terminal or side chain of the siloxane skeleton. The unsaturated group has a chemical bond that is bonded at a divalent or higher valence between adjacent atoms. Specific examples of the unsaturated group include a vinyl group, an aryl group, an acetylene group, and a 1-butenyl group.

  The polyorganosiloxane having a plurality of unsaturated groups is particularly preferably a vinyl-diphenylsiloxane-dimethylsiloxane structure at both ends. In this case, the polyorganosiloxane having a plurality of unsaturated groups has both a high refractive index due to the diphenyl side chain unit and a low refractive index due to the dimethyl side chain unit. Moreover, it is preferable that the ratio of the diphenylsiloxane contained in polyorganosiloxane is set to the range of 1-20 mol%. Generally, in applications in the field of optical communication, it is desirable that the refractive index of the optical component bonding material be set in the range of about 1.4 to 1.5. When the proportion of diphenylsiloxane contained in the polyorganosiloxane is less than 1 mol%, it is difficult to adjust the refractive index. On the other hand, when the proportion of diphenylsiloxane exceeds 20 mol%, it is difficult to adjust the refractive index, which is not preferable. Furthermore, in this case, since the vinyl groups at both ends contribute to the addition polymerization with the polyorganohydrogensiloxane, the change in the refractive index due to the change in the crosslinked structure can be suppressed to a small level. Therefore, the vinyl-diphenylsiloxane-dimethylsiloxane structure at both ends is suitable when the refractive index is particularly required among the optical properties of the optical component bonding material.

  The polyorganohydrogensiloxane has at least two hydrogen atoms bonded to a plurality of silicon atoms in one molecule. Such a polyorganohydrogensiloxane cures as a result of forming a crosslinked structure by addition polymerization with a polyorganosiloxane having a plurality of unsaturated groups. Examples of the substituent bonded to the silicon atom include, in addition to a hydrogen atom, an alkyl group typified by a methyl group or an ethyl group, an aryl group such as a phenyl group, and a substituted alkyl group such as a chloromethyl group. Further, the polyorganohydrogensiloxane may be any of linear, branched and cyclic forms, or a combination thereof.

As the polyorganohydrogensiloxane, those shown in the following (a) to (c) are preferably used.
(A) Polyorganohydrogensiloxane (b) containing (CH ₃ ) ₂ HSiO— group as side chain

（但し、式中、Ｒ_１はメチル基又は長鎖アルキル基、Ｒ_２はメチル基又はエチル基、ｍは３〜１００、ｎは０〜１００の整数）で表される直鎖状ポリオルガノハイドロジェンシロキサン。
（ｃ）

(In the formula, R ₁ is a methyl group or a long-chain alkyl group, R ₂ is a methyl group or an ethyl group, m is an integer of 3 to 100, and n is an integer of 0 to 100). Gensiloxane.
(C)

（但し、式中、Ｒ_３はメチル基又はフェニル基、ｐは１〜１００、ｑは０〜１００の整数）で表される直鎖状ポリオルガノハイドロジェンシロキサン。

(In the formula, R ₃ is a methyl group or a phenyl group, p is an integer of 1 to 100, and q is an integer of 0 to 100).

  In the presence of a catalyst, the solidified bonding material obtained by addition polymerization of a polyorganosiloxane having a plurality of unsaturated groups and a polyorganohydrogensiloxane having a hydrogen atom bonded to a plurality of silicon atoms has fluidity. It has only to have a hardness that is not shown, and is preferably a clay-like, gel-like, rubber-like or glass-like solidified product. However, when the solidified bonding material is removed from the optical component and bonded to the optical component again, the reaction product of the silicone mixed solution preferably has a gel or rubber shape. In this case, the blending amount of the polyorganohydrogensiloxane is set so that the number of hydrogen atoms bonded to silicon atoms is 1 to 10 with respect to one unsaturated group of the polyorganosiloxane, and 1.5 It is preferable to set to be 4 to 4.

  When the refractive index is particularly required among the optical properties of the bonding material, a refractive index adjusting material may be added to the silicone mixed solution in order to adjust the refractive index. Since the refractive index adjusting material does not react with the silicone mixed solution, a polyorganosiloxane having an alkyl group such as a methyl group or an ethyl group or an aryl group such as a phenyl group is used as a substituent bonded to a silicon atom. It is done. When polyorganosiloxane is used as the refractive index adjusting material, it is preferable to use polydimethylsiloxane in order to lower the refractive index of the optical component bonding material, and in order to increase the refractive index of the optical component bonding material, It is preferable to use phenylmethylsiloxane or polydiphenylsiloxane. In this case, the ratio of the polyorganohydrogensiloxane contained in the silicone mixed solution is set in the range of 1 wt% to 25 wt% because the refractive index can be easily adjusted according to the increase or decrease in the content. It is preferable. Moreover, if the fluctuation | variation of the refractive index after hardening of a silicone mixed solution is considered, the refractive index of an optical component joining material can also be adjusted in the range of -0.02- + 0.02 from a desired value.

  In order to adjust the viscosity of the silicone mixed solution, fine powder such as silica may be added and dispersed. As another method, the molecular weight of each siloxane constituting the silicone mixed solution may be adjusted. By these methods, the viscosity of the silicone mixed solution can be adjusted in the range of 0.01 Pa · s to 100 Pa · s (10 to 100000 cs), but it is low from the viewpoint of preventing air bubbles from entering the joint surface of the optical component. It is preferable to set.

Next, a method for using the optical component bonding material of the present embodiment will be described.
First, an organic solution containing a catalyst is applied to the joint surface of the optical component. Since the organic solvent volatilizes after the application of the organic solution, the catalyst is uniformly dispersed and remains in a concentrated state on the joint surface of the optical component. Next, the optical component to which the organic solution is applied and another optical component to be bonded to the optical component are arranged to face each other, and a predetermined amount of the silicone mixed solution is injected and filled in the gap between the bonding surfaces of both optical components. At this time, the silicone mixed solution comes into contact with the catalyst remaining on the joint surface of the optical component, and in the presence of the catalyst, the polyorganosiloxane having a plurality of unsaturated groups and the polyorganohydrogensiloxane undergo a hydrosilylation reaction. As a result, polyorganosiloxane having a plurality of unsaturated groups and polyorganohydrogensiloxane undergo addition polymerization, so that the liquid silicone mixed solution gradually cures with time and eventually solidifies. In this way, the two optical components are bonded together by the solidified product of the silicone mixed solution (optical component bonding material after solidification). In this case, the viscosity of the silicone mixed solution is 0.1 Pa · s because it prevents air bubbles from being mixed into the solution during injection and filling, and air mixed in the solution is easily removed. It is preferable to set it to (100 cs) or less.

According to this embodiment, the following effects can be obtained.
(1) An optical component bonding material includes a volatile organic solvent containing a catalyst, a polyorganosiloxane having a plurality of unsaturated groups, and a polyorganohydrogensiloxane having a plurality of hydrogen atoms bonded to a plurality of silicon atoms, respectively. A mixed silicone mixed solution. When two optical components are bonded by such an optical component bonding material, bubbles are not mixed between the bonding surfaces of both optical components, and the optical component bonding material does not flow out from the bonded portion. In addition, there is no need to uniformly mix the catalyst, the component having an unsaturated group, and the component having a hydrogen atom bonded to a silicon atom, and the liquid optical component bonding material is solidified only by contacting the catalyst with a silicone mixed solution. be able to. For this reason, there is no mixing work, defoaming work, etc., and the amount of material used can be saved, so that the work burden and the economic burden can be reduced. Accordingly, it is possible to avoid the occurrence of connection loss due to the mixing of bubbles, to improve the workability at the time of joining, and to provide an optical component joining material that can reduce the economic burden.

  (2) The polyorganosiloxane having a plurality of unsaturated groups has a vinyl-diphenylsiloxane-dimethylsiloxane structure at both terminals, and the ratio of diphenylsiloxane contained in the polyorganosiloxane is set in the range of 1 to 20 mol%. ing. In this case, the refractive index of the optical component bonding material can be easily adjusted to a desired value, and a change in the refractive index due to a change in the crosslinked structure can be suppressed to a small value. Therefore, it is suitable when the refractive index is particularly required among the optical characteristics of the optical component bonding material.

In addition, this embodiment can also be changed and embodied as follows.
-In this embodiment, after apply | coating the organic solution containing a catalyst to the joint surface of an optical component, the optical component with which the organic solution was apply | coated and another optical component joined to it are arrange | positioned facing, and both optical components The silicone mixed solution was injected and filled between the bonding surfaces of the two. Instead, after the silicone mixed solution is applied to the joint surface of the optical component, the optical component to which the silicone mixed solution is applied and another optical component to be bonded to the optical component are arranged to face each other. You may make it inject | pour and fill the organic solution containing a catalyst between surfaces. In this case, the viscosity of the silicone mixed solution is preferably set high in order to prevent the silicone mixed solution applied to the joint surface of the optical component from flowing out and improve the smoothness of the silicone mixed solution. It is preferably set in the range of 0.1 Pa · s to 1 Pa · s (100 to 1000 cs).

Next, a test example and a comparative example embodying the optical component bonding material of the present embodiment will be described.
Example 1

  In Example 1, an organic solution containing a catalyst was prepared by dissolving a complex of chloroplatinic acid and vinylsiloxane in toluene so that the platinum content was 0.05 wt%. As the polyorganosiloxane having a plurality of unsaturated groups, polymethylvinylsiloxane having a vinyl content of 4 mol% of all substituents and a viscosity of 0.3 Pa · s (300 cs) was used. As a polyorganohydrogensiloxane having hydrogen atoms bonded to a plurality of silicon atoms, a methylhydrogensiloxane having a Si—H group content of 4 mol% of all substituents and a viscosity of 0.03 Pa · s (30 cs) Was used. Then, 100 parts by weight of polymethylvinylsiloxane and 10 parts by weight of methylhydrogensiloxane were mixed to prepare a silicone mixed solution.

  Next, as shown in FIG. 3, an evaluation optical component 11 was fabricated from a plurality of optical fibers 12 and a rectangular parallelepiped resin molded body 13 that supports them. As a material of the resin molded body 13, a transparent UV curable resin was used so that air bubbles contained in the solidified bonding material 15 and the outflow of the bonding material 15 from the bonded portion could be visually observed. When molding the resin molded body 13, the plurality of optical fibers 12 were arranged in parallel, and the UV curable resin was cured together with the optical fibers 12 in a state in which the end surfaces on one side were aligned at the same position. And the end surface of the resin molding 13 was grind | polished, and the joining surface 11a of the optical component 11 for evaluation was finished smoothly.

Subsequently, a set of evaluation optical components 11 was prepared, an organic solution containing a catalyst was applied to the joint surface 11a of the first evaluation optical component 11 with a brush, and then allowed to stand at room temperature for several minutes. Further, a silicone mixed solution was applied to the joint surface 11a of the second evaluation optical component 11 with a dropper. Then, the optical parts 11 for both evaluations are brought close to each other so that the distance between their joint surfaces 11a is 0.1 mm, and in that state, they are left at room temperature for about 30 minutes to solidify the silicone mixed solution. The optical component 11 was joined. As a result, a joined body 21 as shown in FIG. 4 was obtained.
(Example 2)

In Example 2, as an organic solution containing a catalyst, a platinum-cyclovinylmethylsiloxane complex was dissolved in toluene to prepare a platinum content of 0.05 wt%. As the polyorganosiloxane having a plurality of unsaturated groups, a vinyl-diphenylsiloxane-dimethylsiloxane polymer having a diphenylsiloxane content of 3 mol% of all substituents and a viscosity of 0.5 Pa · s (500 cs) was used. . As a polyorganohydrogensiloxane having a plurality of hydrogen atoms bonded to a plurality of silicon atoms, the content of (CH ₃ ) ₂ HSi— groups is 8 equivalents / kg and the viscosity is 0.01 Pa · s (10 cs). Polyorganohydrogensiloxane was used. Then, 100 parts by weight of both-end vinyl-diphenylsiloxane-dimethylsiloxane polymer and 10 parts by weight of polyorganohydrogensiloxane were mixed to prepare a silicone mixed solution. Using the organic solution containing the catalyst thus obtained and the silicone mixed solution, a joined body 21 composed of the optical components 11 for both evaluations was produced in the same manner as in Example 1.
(Example 3)

In Example 3, as the polyorganosiloxane having a plurality of unsaturated groups, the content of diphenylsiloxane is 15 mol% of all substituents, and the viscosity is 0.5 Pa · s (500 cs). Dimethylsiloxane copolymer was used. As a polyorganohydrogensiloxane having hydrogen atoms bonded to a plurality of silicon atoms, a polyorganohydrosiloxane having a (CH ₃ ) ₂ HSi— group content of 8 equivalents / kg and a viscosity of 0.01 Pa · s (10 cs) Gensiloxane was used. Then, 100 parts by weight of both terminal vinyl-diphenylsiloxane-dimethylsiloxane copolymer and 10 parts by weight of polyorganohydrogensiloxane were mixed to prepare a silicone mixed solution. In addition, a joined body 21 including both the optical components 11 for evaluation was produced from the organic solution containing the catalyst used in Example 2 and the silicone mixed solution by the same method as in Example 1.
(Comparative Example 1)

Nothing was applied to the bonding surface 11a of the first evaluation optical component 11, and the silicone mixed solution used in Example 1 was applied to the bonding surface 11a of the second evaluation optical component 11 with a dropper. And the joined_body | zygote 21 which consists of the optical component 11 for both evaluation was produced by the method similar to Example 1. FIG.
(Comparative Example 2)

Nothing is applied to the bonding surface 11a of the first evaluation optical component 11, and the organic solution and the silicone mixed solution containing the catalyst used in Example 1 are previously applied to the bonding surface 11a of the second evaluation optical component 11. What was mixed and stirred was applied with a brush, left at room temperature overnight, dried and cured. After the applied mixed solution was solidified, a joined body 21 composed of both evaluation optical components 11 was produced in the same manner as in Example 1.
(Evaluation methods)
About Examples 1-3 and the comparative example 1, after apply | coating a silicone mixed solution to the joint surface of the optical component 11 for 1st or 2nd evaluation, the time until a liquid silicone mixed solution solidifies was measured. In Comparative Example 2, since the silicone mixed solution was dried and cured before joining both the optical components 11 for evaluation, the time until the silicone mixed solution solidified was not measured. Moreover, about Examples 1-3 and the comparative examples 1 and 2, the junction part of both the optical components 11 for evaluation was observed visually, and mixing of the bubble to the junction part of the optical components 11 for both evaluation was determined. At the same time, the operator grips the joined body 21 heated to 60 ° C., and the operator shakes the joined body 21 ten times by hand, and then the outflow of the joining material 15 from the joined portion of the optical components 11 for both evaluations. Also judged. The results are shown in Table 1.

実施例１〜３の場合、シリコーン混合溶液は、塗布後、３０分〜１時間かけて徐々に硬化することを確認した。実施例１では、数分後に硬化し始め、１時間後に完全に固化した。実施例２及び３では、数分後に硬化し始め、３０分後に完全に固化した。また、実施例１〜３の場合、両評価用光部品１１の接合面間への気泡の混入はなく、両接合面間からの接合材１５の流出も確認されなかった。一方、比較例１の場合、シリコーン混合溶液は、塗布後、硬化しなかった。しかも、両評価用光部品１１の接合面間からの接合材１５の流出が確認された。比較例２の場合、両評価用光部品１１の接合面間への気泡の混入が確認された。これは、両評価用光部品１１を接合する前、有機溶液とシリコーン混合溶液とを混合及び撹拌したときに気泡が混入したものと推察される。また、実施例１〜３の接合材を用いて試験片を作製し、接合強度を評価した。具体的には、２枚のポリカーボネート樹脂製の板を準備し、両板の接合面（接合面積２ｃｍ^２）に接合材を薄く塗布した。塗布後、両板を貼り合わせて、両板間の接合材を固化することにより、上記の試験片を作製した。そして、両カーボネート樹脂製の板の一方と他方とを接合材の塗布面に沿って反対方向に引っ張り、その引っ張り剥離強度を測定することによって、得られた試験片の接合強度を評価した。その結果、実施例１〜３の接合体では、それらの接合強度についていずれも２Ｎ以上となり、良好な結果が得られた。

In the case of Examples 1 to 3, it was confirmed that the silicone mixed solution was gradually cured after application for 30 minutes to 1 hour. In Example 1, it began to harden after a few minutes and was completely solidified after 1 hour. Examples 2 and 3 began to harden after a few minutes and were completely solidified after 30 minutes. Moreover, in Examples 1-3, there was no mixing of bubbles between the joint surfaces of the optical components 11 for both evaluations, and no outflow of the joining material 15 from between the joint surfaces was confirmed. On the other hand, in the case of Comparative Example 1, the silicone mixed solution was not cured after application. Moreover, outflow of the bonding material 15 from between the bonding surfaces of the optical parts for evaluation 11 was confirmed. In the case of Comparative Example 2, it was confirmed that bubbles were mixed between the joint surfaces of the optical parts for evaluation 11. This is presumed that bubbles were mixed when the organic solution and the silicone mixed solution were mixed and stirred before joining the optical components for evaluation 11 together. Moreover, the test piece was produced using the joining material of Examples 1-3, and joining strength was evaluated. Specifically, two polycarbonate resin plates were prepared, and the bonding material was thinly applied to the bonding surfaces (bonding area 2 cm ² ) of both plates. After the application, both the plates were bonded together, and the bonding material between the two plates was solidified to produce the above test piece. Then, one of the two carbonate resin plates and the other were pulled in the opposite direction along the application surface of the bonding material, and the tensile peel strength was measured to evaluate the bonding strength of the obtained test piece. As a result, in the joined bodies of Examples 1 to 3, the joining strength was 2N or more, and good results were obtained.

  Next, the solidified bonding material 15 is peeled off from the bonded body 21 obtained in Examples 2 and 3, and the refractive index of the bonding material 15 is changed to a multi-wavelength Abbe refractometer DR-M2 (sodium D manufactured by Atago Co., Ltd.). Line). The results are shown in Table 2 together with the refractive index of the liquid silicone mixed solution.

実施例２及び３の場合、シリコーン混合溶液の屈折率は、固化前と固化後とで大きな差違が見られなかった。従って、実施例２及び３の場合、所望の屈折率が容易に得られる接合材であることが確認された。

In the case of Examples 2 and 3, the refractive index of the silicone mixed solution was not significantly different between before and after solidification. Therefore, in the case of Examples 2 and 3, it was confirmed that the bonding material can easily obtain a desired refractive index.

Perspective view of multi-core optical fiber connector The side sectional view showing the state where a set of ferrules were joined. The perspective view of the optical component for evaluation. The upper sectional view showing the state where a set of optical parts for evaluation was joined.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Connector, 2 ... Optical fiber, 3 ... Ferrule, 3a ... Guide hole, 3b ... Joining surface, 4 ... Guide rod, 5 ... Joining material, 11 ... Optical component for evaluation, 11a ... Joining surface, 12 ... Optical fiber, 13 ... resin molding, 15 ... bonding material, 21 ... bonding body.

Claims (2)

An optical component bonding material for bonding optical components,
A volatile organic solution containing a catalyst; and
An optical component bonding material comprising: a polyorganosiloxane having a plurality of unsaturated groups and a silicone mixed solution in which a polyorganohydrogensiloxane having a plurality of hydrogen atoms bonded to a plurality of silicon atoms is mixed. In the optical component bonding material according to claim 1,
The polyorganosiloxane having a plurality of unsaturated groups has a vinyl-diphenylsiloxane-dimethylsiloxane structure at both ends, and the ratio of diphenylsiloxane contained in the polyorganosiloxane is set in the range of 1 to 20 mol%. Optical component bonding material.

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