CN-121806223-B - Bending-resistant multi-core MPO connector and preparation method thereof

CN121806223BCN 121806223 BCN121806223 BCN 121806223BCN-121806223-B

Abstract

The invention relates to the technical field of connector optical cables, and discloses a bending-resistant multi-core MPO connector and a preparation method, wherein the MPO connector comprises a bending-resistant multi-core optical cable assembly and an MPO connector; the bending-resistant multi-core optical cable component comprises an optical fiber, an aramid yarn layer, an inner protective layer, a bending-resistant outer protective layer and a weaving layer, wherein polyvinyl chloride resin, chlorinated polyethylene grafted nitrile rubber, a plasticizer, a stabilizer and a filler are mixed to obtain the bending-resistant outer protective layer, a chlorinated polyethylene molecular chain is introduced into the end position of the nitrile rubber, the compatibility between the chlorinated polyethylene molecular chain and polyvinyl chloride is improved, the polyvinyl chloride is better toughened, the bending strength and the impact strength are improved, the tensile strength is also improved, the flexibility and the bending-resistant capability of the protective layer are improved, and the phenomena that the connecting part of a connector and an optical cable of the connector is cracked due to long-term bending are avoided.

Inventors

HAN YUFENG
TU JIANBIN
ZHU KAI
DOU WENCHAO
LIN WEIFENG
JI XIONGTAO
WU TIANTIAN
SHEN CHENXI
ZHU CONGWEI

Assignees

江苏亨通光电股份有限公司
广东亨通光电科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260310

Claims (9)

1. The preparation method of the bending-resistant multi-core MPO connector is characterized in that the MPO connector comprises a bending-resistant multi-core optical cable component and an MPO connector; the bending-resistant multi-core optical cable component comprises an optical fiber, an aramid yarn layer, an inner protective layer, a bending-resistant outer protective layer and a weaving layer; The preparation method of the bending-resistant outer sheath comprises the steps of mixing polyvinyl chloride resin, chlorinated polyethylene grafted nitrile rubber, plasticizer, stabilizer and filler in a mixer, and then mixing and blanking in a double-roller open mill to obtain the bending-resistant outer sheath; the mass ratio of the polyvinyl chloride resin to the chlorinated polyethylene grafted nitrile rubber to the plasticizer to the stabilizer to the filler is 100 (10-30), 20-30, 2.4-3 and 10-25.
2. The method of manufacturing a bending-resistant multi-core MPO connector according to claim 1, wherein the inner sheath is a cross-linked polyethylene layer, and the braid is woven from fibers, including polyester fibers or nylon fibers.
3. The method of manufacturing a bend-resistant multi-core MPO connector of claim 1, wherein the crimp connection is performed between the bend-resistant outer jacket and the braid by a glue adhesive.
4. The method for producing a bending-resistant multi-core MPO connector according to claim 1, wherein the temperature during kneading is 165-175 ℃ for 7-10min.
5. The method for manufacturing a bending-resistant multi-core MPO connector according to claim 1, wherein the stabilizer is one or more of tribasic lead sulfate and dibasic lead phosphite, and the plasticizer is dioctyl phthalate.
6. The method of manufacturing a bend-resistant multi-core MPO connector of claim 1, wherein the filler is one or more of calcium carbonate and zinc oxide.
7. The method for preparing the bending-resistant multi-core MPO connector according to claim 1, wherein the method for preparing the chlorinated polyethylene grafted nitrile rubber is characterized in that hydroxyl-terminated nitrile rubber and tertiary butyl alcohol solution of tertiary butyl alcohol sodium are added into N, N-dimethylformamide, heated to 40-60 ℃, stirred and activated for 1-2 hours, then chlorinated polyethylene is added, stirred and reacted for 12-18 hours, the solution is poured into water, stirred and then kept stand for layering, and the product is washed after separation and dried, so that the chlorinated polyethylene grafted nitrile rubber is obtained.
8. The method for manufacturing a bending-resistant multi-core MPO connector according to claim 7, wherein the mass ratio of the hydroxyl-terminated nitrile rubber to the sodium tert-butoxide to the chlorinated polyethylene is 100 (1.6-2.3): 4-10.
9. A bending-resistant multi-core MPO connector obtainable by the method of any one of claims 1-8.

Description

Bending-resistant multi-core MPO connector and preparation method thereof Technical Field The invention relates to the technical field of connector optical cables, in particular to a bending-resistant multi-core MPO connector and a preparation method thereof. Background MPO connector is a multi-core optical fiber connector, is often used as a connector of a high-speed transmission standard, and is widely applied to occasions requiring high-speed and high-density optical fiber interconnection, such as data centers, 5G networks, enterprise-level wiring and the like. The optical cable part of the MPO connector mainly comprises optical fibers, an inner protective layer, an outer protective layer and the like, wherein the outer protective layer is mainly made of polyvinyl chloride, polyurethane and the like, and has the protection effects of fire prevention, water prevention, corrosion prevention and the like. In the actual use process, the optical cable part of the MPO connector can be subjected to external force and is in a long-term bending state, and if the toughness of the outer protective layer of the optical cable is poor, the optical cable and the connector part are easy to crack and break, so that the signal transmission performance of the MPO connector is affected. Patent CN114249929B discloses that the prepared connector sheath tube has performances of silicone oil resistance, seawater corrosion resistance, ozone resistance and the like by taking nitrile rubber/polyvinyl chloride blended rubber, white carbon black, plasticizer, anti-aging agent and the like as raw materials, but the patent does not improve performances of impact strength, bending strength and the like of the polyvinyl chloride sheath tube, and has poor flexibility. Disclosure of Invention The technical problem solved by the invention is that the MPO connector optical cable has poor flexibility and bending resistance. The technical scheme is that the bending-resistant multi-core MPO connector comprises a bending-resistant multi-core optical cable component and an MPO connector, wherein the bending-resistant multi-core optical cable component comprises an optical fiber, an aramid yarn layer, an inner protective layer, a bending-resistant outer protective layer and a weaving layer. For example, the bending-resistant multi-core optical cable assembly sequentially comprises an optical fiber, an aramid yarn layer, an inner protective layer, a bending-resistant outer protective layer and a braiding layer from inside to outside. The preparation method of the bending-resistant outer protective layer comprises the following steps: (1) Adding hydroxyl-terminated nitrile rubber and tertiary butyl alcohol solution of tertiary butyl alcohol sodium into N, N-dimethylformamide, stirring and activating, then adding chlorinated polyethylene, stirring and reacting, pouring the solution into water, stirring, standing and layering, separating and removing water and N, N-dimethylformamide, washing the product with water, and drying to obtain the chlorinated polyethylene grafted nitrile rubber. (2) Mixing polyvinyl chloride resin, chlorinated polyethylene grafted nitrile rubber, plasticizer, stabilizer and filler in a mixer, and then mixing and blanking in a double-roller open mill to obtain the bending-resistant outer sheath. Preferably, the inner sheath is a crosslinked polyethylene layer. Preferably, the braid is woven from fibers, including polyester or nylon fibers. Preferably, the mass ratio of the hydroxyl-terminated nitrile rubber, the sodium tert-butoxide and the chlorinated polyethylene in the step (1) is 100 (1.6-2.3) to 4-10. Preferably, the stirring activation in (1) is carried out at 40-60℃for 1-2h. Preferably, the stirring reaction in (1) is carried out at 40-60℃for 12-18h. Preferably, the temperature during kneading in (2) is 165-175℃and the time is 7-10min. Preferably, the mass ratio of the polyvinyl chloride resin to the chlorinated polyethylene grafted nitrile rubber to the plasticizer to the stabilizer to the filler in the step (2) is 100 (10-30), 20-30, 2.4-3 and 10-25. Preferably, the stabilizer in (2) comprises tribasic lead sulfate, dibasic lead phosphite. Preferably, the plasticizer in (2) comprises dioctyl phthalate. Preferably, the filler in (2) comprises calcium carbonate, zinc oxide. Preferably, the outer protective layer and the braiding layer of the optical cable can be in pressure connection through a glue adhesive, so that the pulling-out force of the cable assembly is improved, and the pulling-out force of the assembly is more than or equal to 150N. The glue adhesive comprises epoxy resin glue and acrylic resin glue. The invention has the beneficial technical effects that the hydroxyl-terminated groups of the nitrile rubber are activated by utilizing the sodium tert-butoxide to form an active sodium alkoxide structure (-ONa), then the active sodium alkoxide structure is subjected to etherification reaction with chlorine ato