A non-metallic material for encapsulating an optical transmission device and a preparation method thereof

Abstract

This application relates to the field of optical signal transmission packaging materials, and particularly to a non-metallic material for packaging optical transmission devices and a preparation method thereof. In this solution, the single-end hydroxyl silicone oil and silica filler are modified by a silane coupling agent, and then the dispersion effect of the modified particles is enhanced by a cycloolefin polymer, so that the large-particle-size silica particles can still maintain good dispersibility, thereby improving the transparency of the rubber compound.

Description

Technical Field

[0001] This application relates to the field of optical signal transmission packaging materials, and particularly to a non-metallic material for packaging optical transmission devices and a preparation method thereof. Background Art

[0002] The natural rubber / styrene-butadiene rubber blend system has extensive applications in the preparation of masterbatch. It can play an important role in fields such as sealing, bonding, support, and encapsulation protection. In optical communication or optical signal transmission devices, the blend mainly composed of natural rubber / styrene-butadiene rubber can well protect the optical transmission medium. It has high softness, good bonding performance to each component, simple preparation, and low cost, thus having extensive applications.

[0003] SBR1500 is a commonly used styrene-butadiene rubber raw material. After being mixed with natural rubber, it can obtain a rubber system with good viscoelasticity through vulcanization and mixing. A series of fillers such as silica and calcium carbonate are usually added to the system. On the one hand, it can reduce the cost of rubber, and on the other hand, it also provides certain wear resistance, support strength, and hardness.

[0004] The fillers in the system will significantly affect the light transmittance of the system, especially when their particle size is large. Generally, in order to improve the transparency of the rubber system, ultra-fine filler structures such as fumed silica need to be used for the fillers. Otherwise, it is very difficult for the light transmittance to exceed 80%. However, fumed silica is expensive, and its addition is likely to cause an increase in hardness (especially in the case of adding silane coupling agent). Summary of the Invention

[0005] The main purpose of this solution is to provide a masterbatch rubber system with high light transmittance and high elasticity.

[0006] First of all, this application provides a non-metallic material for packaging optical transmission devices, which includes the following components by mass parts:

[0007] 100 parts of natural rubber

[0008] 50 - 70 parts of styrene-butadiene rubber

[0009] 15 - 30 parts of cycloolefin polymer

[0010] 5 - 10 parts of mono-end hydroxyl silicone oil

[0011] 15 - 25 parts of silica filler

[0012] 1 - 2 parts of silane coupling agent;

[0013] 2 - 4 parts of sulfur

[0014] 1 - 2 parts of accelerator

[0015] 3 - 5 parts of organophosphorus flame retardant

[0016] It also includes fatty alcohol polyoxyethylene ether, and the mass of the aliphatic polyoxyethylene ether is 0.3 - 0.5 times that of the cycloolefin polymer;

[0017] The particle size of the silica filler is not greater than 10 μm;

[0018] The styrene - butadiene rubber is SBR - 1500.

[0019] In the above - mentioned scheme, nanoparticles with a silica particle size close to 1 μm can be accepted, and still better light transmittance can be achieved. The overall light transmittance is not less than 60%. The reason is that in the above - mentioned scheme, a coupling system mainly composed of hydroxy silicone oil and silane coupling agent is added, enabling the silica particles to be coupled with hydroxy silicone oil to a certain extent. On this basis, after the silica particles are coupled with mono - terminal hydroxy silicone oil, the distance between the silica particles is relatively far, so it is not easy to form a silica agglomeration system that seriously affects transparency in the system. Therefore, even when the silica particles are relatively large, the light scattering effect is still reduced, and thus good light transmittance is maintained.

[0020] In addition, cycloolefin polymer is also added to the above - mentioned system. Since the cycloolefin polymer has a ring structure and is non - reactive, it will not adsorb silica. Instead, through the barrier property of its ring structure, the agglomeration phenomenon of the silica / silicone oil system is reduced, further ensuring the transparency of the system. At the same time, the cycloolefin polymer also improves the softness of the system, reduces the hardness to a certain extent, and improves the elasticity.

[0021] On the above basis, fatty alcohol polyoxyethylene ether is also added. Fatty alcohol polyoxyethylene ether has an excellent dispersion effect on silica in the system, and its fatty alcohol structure can better promote the compatibility of the silicone oil system with the natural rubber and styrene - butadiene rubber systems. In a system based on natural rubber and styrene - butadiene rubber, adding fatty alcohol polyoxyethylene ether can effectively improve the dispersion performance of other hydrophilic components, further improving the uniformity of the system. In the system, the mass of fatty alcohol polyoxyethylene ether and cycloolefin polymer has a positive correlation. Since the ring structure in the cycloolefin polymer can improve its compatibility with the fatty alcohol end in fatty alcohol polyoxyethylene ether, and the polyoxyethylene ether chain has good softness, a more uniform, soft and higher - cohesive system can be formed in the above - mentioned system, keeping the overall strength and elasticity good.

[0022] In the above-mentioned system, the refractive index of the doping system formed by fatty alcohol polyoxyethylene ether and cycloolefin polymer is relatively close to that of silica filler. Overall, the transparency can reach about 90%, and its mechanical properties are not impaired, making the prepared rubber compound have good viscosity, elasticity and transparency.

[0023] In addition, the above-mentioned system may further include additives with a total mass fraction not exceeding 10 parts and having no influence on the transparency of the system, such as antioxidants, anti-aging agents, etc.

[0024] Preferably, the cycloolefin polymer is an ethylene and norbornene copolymer system. More preferably, the cycloolefin polymer is TOPAS6013.

[0025] The cycloolefin polymer of the norbornene system has better barrier properties, can better prevent the agglomeration of the silica system, and thus reduce light scattering in the system and improve the light transmittance. On this basis, through experiments, using TOPAS6013 (which can be purchased from Polyplastics or other companies), the obtained plastic system has better comprehensive strength, transparency and elasticity.

[0026] Preferably, it further includes a tackifying resin, and the mass fraction of the tackifying resin is 10-15 parts.

[0027] The tackifying resin can improve the viscosity, strength and cohesion of the system, making it have good viscosity on different materials (such as PET plastics or similar rubbers), while also having a certain improvement in internal strength.

[0028] Preferably, it further includes 3-5 parts by mass of white oil, and the white oil is selected from No. 22 white oil, No. 32 white oil or No. 46 white oil.

[0029] White oil can play a lubricating role in the system. It has certain solvent properties. Therefore, adding white oil can make each component mix more evenly during the internal mixing process, reduce the temperature required for internal mixing, and improve the processing performance.

[0030] In the above-mentioned solution, preferably No. 22 white oil, No. 32 white oil or No. 46 white oil is selected. The viscosity of the above white oil is moderate. Continuing to use high-viscosity white oil will result in poor mixing uniformity of the system, and hydroxyl silicone oil and silica filler are more likely to precipitate in the system, thereby causing a decrease in the light transmittance of the system. While using low-viscosity white oil of a low grade is likely to cause uneven mixing of the materials, and non-polar systems (such as natural rubber and cycloolefin copolymer) cannot be evenly distributed in the system, and it has good adhesiveness to the equipment during processing and is difficult to process smoothly at a lower temperature, thereby resulting in an increase in the temperature required for processing.

[0031] Preferably, the viscosity of the mono-end hydroxyl silicone oil is 50-60 cst.

[0032] The silicone oil within the above viscosity range has a molecular chain length that is just right, enabling an appropriate particle spacing between the silica particles, which precisely allows for a uniform system distribution. Selecting a hydroxyl silicone oil with a short molecular chain and low viscosity will cause local agglomeration of the silica. The resistance generated between the silica molecules is insufficient, making it easier to agglomerate in an overall non-hydrophilic environment. On the other hand, the hydroxyl silicone oil in a long molecular chain system is prone to agglomeration of the hydroxyl silicone oil molecules themselves, and its coupling on the silica surface is more difficult to occur, which will also affect the transparency of the system.

[0033] Preferably, the fatty alcohol polyoxyethylene ether is Peregal O-10.

[0034] Through experiments, when the fatty alcohol polyoxyethylene ether is Peregal O-10, it has better dispersibility and uniformity in the system. Through experiments, the obtained product has better strength and softness.

[0035] In addition, the present application also provides a preparation method for the above-mentioned non-metallic material for encapsulating the optical transmission device, including the following steps

[0036] S1. Mix natural rubber, styrene-butadiene rubber, cycloolefin polymer, the first part of the mono-terminal hydroxyl silicone oil, fatty alcohol polyoxyethylene ether, and the first part of the silica filler by internal mixing. The internal mixing temperature is 100 - 120 °C, and the internal mixing time is 20 - 40 s. Preferably, white oil and tackifying resin can also be added in this step;

[0037] S2. Add the first silane coupling agent to the above system, then add the second part of the silica filler, and raise the temperature to 140 - 145 °C for internal mixing, with an internal mixing time of 10 - 15 s;

[0038] S3. Add the second part of the silane coupling agent, the third part of the silica filler, and the second part of the mono-terminal hydroxyl silicone oil to the above system, and lower the temperature to 130 - 140 °C, and internally mix for 1 - 2 min; in this step, the internal mixing time is preferably 75 - 90 s;

[0039] S4. Add sulfur and accelerator to the above system, maintain at 130 - 140 °C, internally mix for 40 - 60 s, and discharge. The discharge temperature is 130 - 150 °C;

[0040] Among them, the mass ratio of the first part of the mono-terminal hydroxyl silicone oil to the second part of the mono-terminal hydroxyl silicone oil is 1∶0.5 - 2;

[0041] The mass ratio of the first part of the silane coupling agent to the second part of the silane coupling agent is 1∶2 - 4;

[0042] The first part of the silica filler accounts for 30 - 40% of the mass of the silica filler, and the second part of the silica filler accounts for 20 - 30.

[0043] In the above system, a system for stepwise reaction of silica filler and epoxy coupling agent is adopted. Through experiments, it is found that if all silica, silicone oil and coupling agent are added to the system at one time, on the one hand, the silica itself may agglomerate before the reaction, which may lead to the appearance of color patches and color spots in the final product, affecting the color uniformity. On the other hand, after the coupling agent may react quickly with hydroxyl silicone oil, under the barrier of the organic phase system, it is necessary to greatly increase the reaction temperature to achieve sufficient reaction, which instead affects the quality of the finally prepared rubber system.

[0044] Therefore, in the above solution, by means of stepwise reaction, first make the mono-terminal hydroxyl silicone oil and silica filler pre-stepwise uniform in the system, then add part of the coupling agent for reaction, and the reaction is carried out in two steps. First, carry out the first reaction at a higher temperature, and then appropriately reduce the temperature to carry out the second part of the reaction at a lower temperature. Overall, two-step reaction is more conducive to the full reaction of silica and

[0045] Of course, another feasible solution is to fully react silica, hydroxyl silicone oil and coupling agent outside the rubber system first, but this reaction step adds extra complexity to the processing process and is prone to introducing other impurities such as solvents. Especially water may be introduced into the system, which will have a greater adverse impact on the rubber system.

[0046] To sum up, in this solution, a coupling structure formed by coupling mono-terminal hydroxyl silicone oil and silica filler is used, and cycloolefin polymer and fatty alcohol polyoxyethylene ester are added to the system for dispersion, so as to obtain a masterbatch system with good transparency. At the same time, in the above process, by means of stepwise mixing, the agglomeration of silica filler is reduced, so that even when the particle size of the silica filler is relatively large, good light transmittance can still be maintained, reducing the production cost. Specific Embodiments

[0047] The preparation method of the non-metallic material for optical transmission device packaging described in this application is further elaborated through the following specific embodiments.

[0048] For the embodiments involved in this application, the following experiments are used to detect the performance:

[0049] 1. Strength experiment: Refer to "GB / T 528-2009 Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber" to determine the tensile strength and elongation at break of the system.

[0050] 2. Resilience experiment: Refer to "ASTM-F36" for determination.

[0051] 3. Transparency experiment: Referring to the "National Standard GB / T 2410-2008 Determination of Transmittance and Haze of Transparent Plastics", the transmittance of the sample was measured, and the thickness of the sample was 0.25 mm.

[0052] In the following examples, experiments were carried out on commercially available SBR-1500 styrene-butadiene rubber, and the silica fillers used were all commercially available silica particles. In this solution, the silica filler used was silica with an average particle size of 8.5 μm, and after screening, it was ensured that there were no particles with a particle size greater than 10 μm (here, the average particle size of 8.5 μm was the particle size before screening, but the proportion of the large particle component after screening was less than 1% of the total weight, so it had almost no effect on its average particle size).

[0053] In the following examples, the experimental data were all obtained by small sample experiments, using an experimental internal mixer, and the single charge did not exceed 1 kg. After conducting scale-up experiments on some experimental groups, there was no difference in the overall performance beyond the measurement error, so it can be determined that the experimental data in the following examples also have practical guiding significance after scale-up experiments.

[0054] In Example 1, single-end hydroxyl silicone oil, double-end hydroxyl silicone oil, and methyl silicone oil with different viscosities were used, and the addition amount of the materials was kept uniform. In this example, the addition amount of each material was calculated as follows by mass fraction:

[0055]

[0056]

[0057] Among them, the styrene-butadiene rubber was SBR-1500, the cycloolefin polymer was TOPAS6013, the silane coupling agent was HK-550, the accelerator was vulcanization accelerator CZ, and the organophosphorus flame retardant was tris(ortho-tolyl) phosphate. The silica filler was added in 25 parts by mass in this solution. And the lower the mass dosage of silica, the easier it is to obtain better transparency. Therefore, 25 parts by mass was used as the experimental benchmark in this solution. In addition, in the above solution, a small amount of antioxidants, ultraviolet-resistant agents and other additives can also be added.

[0058] In this example, the white oil used can be No. 22 white oil, No. 32 white oil or No. 46 white oil. Higher-grade white oil will increase the viscosity of the system, while lower-grade white oil has poor solubility in the system, both of which will cause certain difficulties in the processing process. The tackifying resin was a commercially available terpene tackifying resin, the purpose of which was to improve the bonding performance of the system, and the dosage could optionally be within 10-15 parts, with little effect on other mechanical properties and transparency. The aliphatic polyoxyethylene ether was Peregal O-10.

[0059] Regarding the ratio of styrene-butadiene rubber and natural rubber, in half of the cases, the addition amount of styrene-butadiene rubber can be in the range of 50 to 70 parts by mass, and this range can have better softness and hardness.

[0060] The preparation method of this example is as follows:

[0061] S1. Mix natural rubber, styrene-butadiene rubber, cycloolefin polymer, the first part of mono-terminal hydroxyl silicone oil, fatty alcohol polyoxyethylene ether, the first part of silica filler, white oil and tackifying resin by internal mixing. The internal mixing temperature is 120°C and the internal mixing time is 20 s;

[0062] S2. Add the first silane coupling agent to the above system, raise the temperature to 140°C and conduct internal mixing for 15 s;

[0063] S3. Add the second part of silane coupling agent, the second part of silica filler and the second part of mono-terminal hydroxyl silicone oil to the above system, and lower the temperature to 140°C, then conduct internal mixing for 2 min;

[0064] S4. Add sulfur and accelerator to the above system, keep the temperature at 140°C, conduct internal mixing for 60 s, and then discharge the material. The discharge temperature is 130 - 150°C.

[0065] Among them, the mass part of the first part of mono-terminal hydroxyl silicone oil is 5 parts, the mass part of the second part of mono-terminal hydroxyl silicone oil is 5 parts, the mass part of the first silane coupling agent is 0.67 part, the mass part of the second part of silane coupling agent is 1.33 parts, and the mass of the first part of silica filler is 10 parts.

[0066] Table 1

[0067]

[0068] From the experimental results in Example 1, it can be seen that in this solution, only using mono-terminal hydroxyl silicone oil has better effects. The mono-terminal hydroxyl silicone oil can ensure that one silicone oil molecular chain does not connect multiple silica fillers, and at the same time ensures good coupling performance between the silicone oil and the silica filler. At the same time, for the viscosity of the silicone oil, it can be seen that when its viscosity is between 50 and 60 cts, the final product obtained has better light transmittance and elasticity. When adding double-terminal hydroxyl silicone oil to the system, no matter what the viscosity is, it will have an adverse effect on the light transmittance and easily make the whole system become hard. While the ordinary silicone oil has a small difference in light transmittance from the scheme without adding silicone oil, and only slightly improves the resilience and mechanical strength of the system.

[0069] Example 2. In this solution, a mono-hydroxy silicone oil with a viscosity of 53 cts was fixedly selected (i.e., the solutions of Experimental Groups 1-3), and cycloolefin polymers of different grades were used to study the specific roles played by cycloolefin polymers and different cycloolefin polymers in the system. The specific experimental results are shown in Table 2.

[0070] Table 2

[0071]

[0072] From the above experimental results, it can be seen that when multiple cycloolefin polymers are selected, they can all improve the transparency in the system. This is not only because the cycloolefin polymers themselves have high transparency, but also because of the compatibility of the cycloolefin polymers with the silicone oil and silica particle composite system and their performance in reducing the formation of agglomerated systems in the rubber system. Under the arrangement of the cycloolefin molecular chains, the system significantly improves the transparency without significantly affecting the resilience. Among the multiple cycloolefin polymers, TOPAS 6013 shows the best performance in terms of comprehensive mechanical properties, resilience, and light transmittance.

[0073] Furthermore, on the basis of Example Numbers 1-3, the overall dosages of the cycloolefin polymer and the mono-terminal hydroxy silicone oil were adjusted as a whole. The specific experimental results are shown in Table 3.

[0074] Table 3

[0075]

[0076] It should be noted that during the mass adjustment of the mono-terminal hydroxy silicone oil, the mass of the silane coupling agent can be correspondingly increased or decreased.

[0077] From the above experiments, it can be seen that in this solution, the mass fraction of the silicone oil should be controlled within 5-10 parts. Excessive silicone oil will cause excessive dispersion of the silica and silicone oil systems in the system, reducing the cohesion of the rubber system and making it easy to reduce the elongation at break and tensile strength. While the cycloolefin polymer needs to be controlled under the condition of not exceeding 30 parts. Excessive dosage will lead to a decline in the resilience performance of the system.

[0078] Furthermore, on the basis of Experimental Groups 1-3, different aliphatic polyoxyethylene ethers were selected, or other non-ionic surfactants were used instead, and the overall mass was adjusted. The experimental results are shown in Table 4.

[0079] Table 4

[0080]

[0081]

[0082] From the above experimental results, it can be seen that compared with sorbitol-based non-ionic surfactants of the Tween series, fatty alcohol polyoxyethylene ethers represented by Peregal have better effects as softeners and lubricants. The reason may be that the long-chain polyether structure can be better compatible with cycloolefin polymers and other rubber systems to improve the compatibility and uniformity of the overall components. After overall experiments, Peregal O-10 is selected to have better mechanical properties and light transmittance.

[0083] Example 5. The purpose of this example is to select the importance of the step-by-step internal mixing method, and steps S1 to S3 are mainly adjusted as follows:

[0084] 5-1: On the basis of Example 1, step S2 is cancelled, the first silane coupling agent is directly added in step S1, and the internal mixing time of step S1 is adjusted to 35 s.

[0085] 5-2: On the basis of Example 1, step S2 is cancelled, the first silane coupling agent is directly added in step S1, the internal mixing time of step S1 is adjusted to 35 s, and the temperature is adjusted to 140 °C.

[0086] 5-3: On the basis of Example 1, step S2 is cancelled, the first silane coupling agent is directly added in step S1, and other steps remain unchanged.

[0087] 5-4: In step S1, all raw materials except sulfur and accelerator are directly added, and the temperature parameters in the specific internal mixing process remain unchanged.

[0088] 5-5: The temperature of step S1 is adjusted to 100 °C and the time is adjusted to 40 s;

[0089] 5-6: The temperature of step S2 is adjusted to 145 °C and the time is adjusted to 10 s;

[0090] 5-7: The temperature of step S2 is adjusted to 150 °C and the time is adjusted to 7 s;

[0091] 5-8: The temperature of step S3 is adjusted to 130 °C and the time is adjusted to 1 min;

[0092] 5-9: The temperature of step S3 is adjusted to 120 °C and the time is adjusted to 3 min;

[0093] 5-10: The temperature of step S3 is adjusted to 120 °C;

[0094] 5-11: The temperature of step S3 is adjusted to 150 °C and the time is adjusted to 1 min;

[0095] 5-12: The temperature of step S3 is adjusted to 150 °C and the time is adjusted to 45 s;

[0096] 5-13: The parts by mass of the first part of the mono-terminal hydroxyl silicone oil are adjusted to 7.5 parts;

[0097] 5-14: The parts by mass of the first part of the mono-terminal hydroxyl silicone oil are adjusted to 2.5 parts;

[0098] 5-15: The parts by mass of the first part of the mono-terminal hydroxyl silicone oil are adjusted to 1 part;

[0099] 5-16: The parts by mass of the first part of the mono-terminal hydroxyl silicone oil are adjusted to 2.5 parts, and the parts by mass of the first part of the silica filler are adjusted to 7.5 parts;

[0100] 5-17: The parts by mass of the first part of the mono-terminal hydroxyl silicone oil are adjusted to 1 part, the parts by mass of the first part of the silica filler are adjusted to 5 parts, and the parts by mass of the first part of the silane coupling agent are adjusted to 0.4 part;

[0101] 5-18: The parts by mass of the first part of the silane coupling agent are adjusted to 0.4 part;

[0102] 5-19: The parts by mass of the first part of the silane coupling agent are adjusted to 0.2 part;

[0103] 5-20: The parts by mass of the first part of the silane coupling agent are adjusted to 1 part;

[0104] 5-21; All of the silica filler is added in step S1.

[0105] 5-22: The parts by mass of the first part of the silica filler are adjusted to 5 parts;

[0106] 5-23: The time of step S3 is adjusted to 75 s;

[0107] 5-24: The time of step S3 is adjusted to 90 s;

[0108] 5-25: The time of step S3 is adjusted to 105 s.

[0109] It should be noted that in Example 5, the total amount of each material added remains unchanged. Taking Experiment Group 5-13 as an example, when the parts by mass of the first part of the mono-terminal hydroxyl silicone oil are adjusted to 7.5 parts, the parts by mass of the second part of the mono-terminal hydroxyl silicone oil are correspondingly adjusted to 2.5 parts.

[0110] The experimental results of Example 5 are shown in Table 5.

[0111] Table 5

[0112] Number Tensile strength (mPa) Elongation at break (%) Resilience (%) Light transmittance (%) 1-3 10.6 567 59.2 91 5-1 10.2 558 57.4 85 5-2 9.9 530 57.8 85 5-3 9.4 544 54.0 82 5-4 9.0 557 54.4 76 5-5 10.3 558 59.5 90 5-6 10.4 556 59.5 91 5-7 10.0 553 57.3 87 5-8 10.0 588 57.1 91 5-9 9.8 567 58.0 86 5-10 9.8 566 58.6 84 5-11 10.3 545 56.0 87 5-12 10.4 551 55.4 88 5-13 10.5 572 59.0 91 5-14 10.7 576 59.6 90 5-15 10.0 570 59.2 87 5-16 10.5 562 59.5 92 5-17 10.1 561 57.4 86 5-18 10.3 558 60.4 91 5-19 9.9 545 59.5 88 5-20 10.4 570 57.2 87 5-21 10.5 553 54.1 84 5-22 9.7 544 57.0 83 5-23 10.8 579 59.0 93 5-24 11.0 569 59.3 93 5-25 10.5 564 58.9 91

[0113] As can be seen from the above steps, in this solution, a step-by-step reaction method needs to be adopted, and different amounts of mono-end hydroxy silicone oil, silica filler, and silane coupling agent are added in steps S1, S2, and S3 respectively. The main purpose of this step is to control the coupling rate between the silica filler and the silicone oil. Since other components in the system are almost inert compared to the silane coupling agent, the reaction will mainly occur between the silica filler and the silane coupling agent. Overall, the reaction temperature in step S2 should be controlled within the range of 140-145°C as much as possible, and the time is preferably controlled within the range of 1-2 minutes. The optimal reaction time for step S3 is 75-90 seconds. Longer reaction times will cause a certain degree of hardening of the system, while shorter reaction times will cause a certain decrease in the transparency of the product after discharging.

[0114] In this embodiment, by comparing experimental groups 5-1 to 5-3, it can be seen that styrene-butadiene rubber and natural rubber need to be fully blended with silicone oil first and then coupled to obtain a more uniform system. Experimental group 5-4 is a scheme of reacting all at once, and it is difficult to ensure the uniformity of the system in this step. Silica itself is prone to agglomeration, so the formed system has the lowest transparency. In the remaining experimental groups, the parameters of each step are further adjusted. Overall, the mass fraction of the initially added mono-end hydroxy silicone oil can be within the range of 2.5-7.5 parts. Since it has good compatibility after being uniformly dispersed in the system and is not prone to agglomeration, as long as it is not added all at once or too little is added in the early stage, it will not have a great impact on the mechanical properties of the system. However, since the silica filler and the silane coupling agent will react relatively quickly after being added, their added amounts need to be strictly controlled. Specifically, the mass fraction of the filler added for the first time is preferably 7.5-10 parts, and the mass fraction of the silane coupling agent added for the first time is preferably 0.4-0.67 parts.

[0115] In addition, the reaction temperature of step S3 needs to be controlled within the range of 130-140°C, and the kneading time needs to be controlled within the range of 1-2 minutes. Overall, a better reaction effect can be obtained. When the reaction time is controlled within the range of 75-90 seconds, the obtained system has the best transparency (93%). After multiple experiments, this solution can be confirmed as the best implementation method. In step S3, the system undergoes a second cross-linking, and at the same time, the cross-linked system is also dispersed during the kneading process. Too short a reaction time will lead to insufficient cross-linking degree or insufficient cross-linking degree of the cross-linked system, while too long a reaction time is likely to cause the silica filler that has been fully dispersed in the system to precipitate or cause partial chain breakage in the system, both of which will lead to a slight decrease in the overall mechanical properties and transparency.

[0116] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment that do not contribute creatively as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A non-metallic material for encapsulating optical transmission equipment, characterized in that: The components include the following in parts by mass: Natural rubber 100 parts Styrene butadiene rubber 50-70 parts Cycloolefin polymer 15-30 parts 5-10 parts of single-terminal hydroxyl silicone oil Silica filler not more than 25 parts 1-2 parts of silane coupling agent; 2-4 parts sulfur 1-2 parts of accelerator 3-5 parts of organic phosphorus flame retardant Also included are fatty alcohol polyoxyethylene ethers, wherein the mass of the aliphatic polyoxyethylene ether is 0.3 to 0.5 times the mass of the cycloolefin polymer; The particle size of the silica filler is not greater than 10 μm; The styrene-butadiene rubber is SBR-1500; The cycloolefin polymer is a copolymer system of ethylene and norbornene; The viscosity of the single-end hydroxy silicone oil is 50-60cst; The preparation method of the optical transmission equipment encapsulation non-metallic material is as follows: S1, kneading natural rubber, styrene-butadiene rubber, cycloolefin polymer, the first part of single-end hydroxyl silicone oil, fatty alcohol polyoxyethylene ether and the first part of silica filler at a kneading temperature of 100 to 120° C. for 20 to 40 seconds; S2, adding the first part of silane coupling agent to the above system, heating to 140-145°C for banburying, and the banburying time is 10-15s; S3, adding the second part of silane coupling agent, the second part of silica filler and the second part of single-end hydroxy silicone oil to the above system, cooling to 130-140°C, and mixing for 1-2 minutes; S4, adding sulfur and accelerator to the above system, maintaining 130-140°C, banburying for 40-60s, and discharging, the discharging temperature is 130-150°C; The mass ratio of the first part of the single-end hydroxyl silicone oil to the second part of the single-end hydroxyl silicone oil is 1:0.5-2; The mass ratio of the first part of the silane coupling agent to the second part of the silane coupling agent is 1:2-4; The first part of the silica filler accounts for 30-40% of the mass of the silica filler.

2. The optical transmission equipment packaging non-metallic material according to claim 1, characterized in that: The cycloolefin polymer is TOPAS6013.

3. The optical transmission equipment packaging non-metallic material according to claim 1, characterized in that: The invention also includes a tackifying resin, wherein the mass proportion of the tackifying resin is 10 to 15 parts.

4. The optical transmission equipment packaging non-metallic material according to claim 1, characterized in that: It also includes 3 to 5 parts by weight of white oil, wherein the white oil is selected from No. 22 white oil, No. 32 white oil or No. 46 white oil.

5. The optical transmission equipment packaging non-metallic material according to claim 1, characterized in that: The fatty alcohol polyoxyethylene ether is Peregal O-10.

6. The method for preparing a non-metallic material for packaging optical transmission equipment according to any one of claims 1 to 5, characterized in that: The following steps are included S1, kneading natural rubber, styrene-butadiene rubber, cycloolefin polymer, the first part of single-end hydroxyl silicone oil, fatty alcohol polyoxyethylene ether and the first part of silica filler at a kneading temperature of 100 to 120° C. for 20 to 40 seconds; S2, adding the first part of silane coupling agent to the above system, heating to 140-145°C for banburying, and the banburying time is 10-15s; S3, adding the second part of silane coupling agent, the second part of silica filler and the second part of single-end hydroxy silicone oil to the above system, cooling to 130-140°C, and mixing for 1-2 minutes; S4, adding sulfur and accelerator to the above system, maintaining 130-140°C, banburying for 40-60s, and discharging, the discharging temperature is 130-150°C; The mass ratio of the first part of the single-end hydroxyl silicone oil to the second part of the single-end hydroxyl silicone oil is 1:0.5-2; The mass ratio of the first part of the silane coupling agent to the second part of the silane coupling agent is 1:2-4; The first part of the silica filler accounts for 30-40% of the mass of the silica filler.

7. The method for preparing a non-metallic material for encapsulating optical transmission equipment according to claim 6, characterized in that: In step S1, white oil and tackifying resin are also added.

8. The method for preparing a non-metallic material for encapsulating optical transmission equipment according to claim 6, characterized in that: In step S3, the mixing time is 75 to 90 seconds.

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