阅读说明：本技术 一种硅橡胶电缆保护管 (Silicon rubber cable protection pipe ) 是由 许成杰 于 2020-06-29 设计创作，主要内容包括：本发明公开了一种硅橡胶电缆保护管,包括硅橡胶管和缠绕在其外表面的玻璃纤维编织层；硅橡胶管的原料包括：硅橡胶生胶、复合填料、硫化剂、笼型八聚(二甲基硅氧基)倍半硅氧烷、四甲基四乙烯基环四硅氧烷、马来酰胺酸、阻燃剂、结构控制剂；复合填料按照以下工艺制备：将六方氮化硼、球状纳米氧化锌、玻璃微珠、碳纳米管、纳米碳酸钙和碳酸铈加入质量分数为5％的硝酸水溶液中浸泡10-20h,干燥后与十二烷基三甲氧基硅烷、γ-脲丙基三甲氧基硅烷和乙烯基三叔丁氧基硅烷混合,研磨30-60min。本发明提出的硅橡胶电缆保护管,其耐高温性好,耐热耐老化和阻燃性能优异,使用寿命长。(The invention discloses a silicon rubber cable protection pipe, which comprises a silicon rubber pipe and a glass fiber braided layer wound on the outer surface of the silicon rubber pipe; the silicone rubber tube comprises the following raw materials: raw silicon rubber, composite filler, vulcanizing agent, cage octa-poly (dimethylsiloxy) silsesquioxane, tetramethyl tetravinylcyclotetrasiloxane, maleamic acid, flame retardant and structure control agent; the composite filler is prepared according to the following process: adding hexagonal boron nitride, spherical nano zinc oxide, glass beads, carbon nano tubes, nano calcium carbonate and cerium carbonate into a nitric acid aqueous solution with the mass fraction of 5%, soaking for 10-20h, drying, mixing with dodecyl trimethoxy silane, gamma-urea propyl trimethoxy silane and vinyl tri-tert-butoxy silane, and grinding for 30-60 min. The silicone rubber cable protection pipe provided by the invention has the advantages of good high temperature resistance, excellent heat resistance, aging resistance and flame retardance, and long service life.)

1. A silicon rubber cable protection pipe is characterized by comprising a silicon rubber pipe and a glass fiber braided layer wound on the outer surface of the silicon rubber pipe; the silicone rubber tube comprises the following raw materials in parts by weight: 100 parts of raw silicone rubber, 25-43 parts of composite filler, 0.9-1.8 parts of vulcanizing agent, 0.1-1.2 parts of cage octa (dimethylsiloxy) silsesquioxane, 0.1-0.25 part of tetramethyl tetravinylcyclotetrasiloxane, 0.12-0.35 part of maleic amic acid, 2-6 parts of flame retardant and 2.5-5 parts of structure control agent;

the composite filler is prepared according to the following process: adding 9-15 parts by weight of hexagonal boron nitride, 7-16 parts by weight of spherical nano zinc oxide, 3-10 parts by weight of glass beads, 2-5 parts by weight of carbon nano tubes, 5-13 parts by weight of nano calcium carbonate and 1-5 parts by weight of cerium carbonate into 100-200 parts by weight of 5% nitric acid aqueous solution, soaking for 10-20h, drying, mixing with 1-3 parts by weight of dodecyl trimethoxy silane, 1-2.5 parts by weight of gamma-urea propyl trimethoxy silane and 1-3 parts by weight of vinyl tri-t-butoxy silane, and grinding for 30-60min to obtain the composite filler.

2. The silicone rubber cable protection tube according to claim 1, wherein the raw silicone rubber is methyl phenyl vinyl silicone rubber, methyl vinyl silicone rubber in a weight ratio of 1: 3-10.

3. The silicone rubber cable protection tube according to claim 2, wherein the mole content of phenyl groups in the methyl phenyl vinyl silicone rubber is 20-30%, and the mole content of vinyl groups is 0.15-0.22%; the mol content of vinyl in the methyl vinyl silicone rubber is 0.13-0.24%.

4. The silicone rubber cable protection tube according to claim 1, wherein the vulcanizing agent is one or a mixture of two-penta vulcanizing agent, di-t-butyl peroxide, t-butyl peroxybenzoate, and benzoyl peroxide.

5. The silicone rubber cable protection tube according to claim 1, wherein the flame retardant is a mixture of dimelamine pyrophosphate, magnesium borate whisker, zirconium phosphate, resorcinol bis (diphenyl phosphate) and sepiolite, and the weight ratio of dimelamine pyrophosphate, magnesium borate whisker, zirconium phosphate, resorcinol bis (diphenyl phosphate) and sepiolite is 2-5: 1-3: 3-8: 2-9: 1-8.

6. The silicone rubber cable protection tube according to claim 1, wherein the average particle size of the hexagonal boron nitride is 350-550 nm; d of the spherical nano zinc oxide₅₀The grain diameter is 50-80 nm; d of the glass beads₅₀The grain diameter is 30-50 nm; the length of the carbon nano tube is 7-15 μm.

7. The silicone rubber cable protection tube according to any one of claims 1 to 6, wherein the structure-controlling agent is a hydroxyl silicone oil, an ethyl hydrogen-containing silicone oil in a weight ratio of 2 to 5: 1-3.

Technical Field

The invention relates to the technical field of materials, in particular to a silicone rubber cable protection pipe.

Background

The silicone rubber is rubber in which a main chain is composed of silicon and oxygen atoms alternately, and two organic groups are usually attached to the silicon atoms, has excellent high and low temperature resistance, weather resistance, electrical insulation, physiological inertia and the like, and is widely applied to various fields at present. Although the silicone rubber has excellent performance, the silicone rubber still undergoes physical aging and chemical aging under the action of oxygen, ozone and the like during use, so that the silicone rubber cracks, the service life of a protection pipe made of the silicone rubber is greatly shortened, and meanwhile, the flame retardant performance of the silicone rubber is poor, so that the application of the protection pipe made of the silicone rubber in certain special fields is limited.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a silicone rubber cable protection pipe which is good in high temperature resistance, excellent in heat resistance, aging resistance and flame retardance and long in service life.

The invention provides a silicon rubber cable protection pipe, which comprises a silicon rubber pipe and a glass fiber braided layer wound on the outer surface of the silicon rubber pipe; the silicone rubber tube comprises the following raw materials in parts by weight: 100 parts of raw silicone rubber, 25-43 parts of composite filler, 0.9-1.8 parts of vulcanizing agent, 0.1-1.2 parts of cage octa (dimethylsiloxy) silsesquioxane, 0.1-0.25 part of tetramethyl tetravinylcyclotetrasiloxane, 0.12-0.35 part of maleic amic acid, 2-6 parts of flame retardant and 2.5-5 parts of structure control agent;

the composite filler is prepared according to the following process: adding 9-15 parts by weight of hexagonal boron nitride, 7-16 parts by weight of spherical nano zinc oxide, 3-10 parts by weight of glass beads, 2-5 parts by weight of carbon nano tubes, 5-13 parts by weight of nano calcium carbonate and 1-5 parts by weight of cerium carbonate into 100-200 parts by weight of 5% nitric acid aqueous solution, soaking for 10-20h, drying, mixing with 1-3 parts by weight of dodecyl trimethoxy silane, 1-2.5 parts by weight of gamma-urea propyl trimethoxy silane and 1-3 parts by weight of vinyl tri-t-butoxy silane, and grinding for 30-60min to obtain the composite filler.

Preferably, the raw silicone rubber is methyl phenyl vinyl silicone rubber and methyl vinyl silicone rubber in a weight ratio of 1: 3-10.

Preferably, the mole content of phenyl in the methyl phenyl vinyl silicone rubber is 20-30%, and the mole content of vinyl is 0.15-0.22%; the mol content of vinyl in the methyl vinyl silicone rubber is 0.13-0.24%.

Preferably, the vulcanizing agent is one or a mixture of two or more of dipenta-vulcanizing agent, di-tert-butyl peroxide, tert-butyl peroxybenzoate and benzoyl peroxide.

Preferably, the flame retardant is a mixture of dimelamine pyrophosphate, magnesium borate whisker, zirconium phosphate, resorcinol bis (diphenyl phosphate) and sepiolite, and the weight ratio of the dimelamine pyrophosphate, the magnesium borate whisker, the zirconium phosphate, the resorcinol bis (diphenyl phosphate) and the sepiolite is 2-5: 1-3: 3-8: 2-9: 1-8.

Preferably, the average particle size of the hexagonal boron nitride is 350-550 nm; d of the spherical nano zinc oxide₅₀The grain diameter is 50-80 nm; d of the glass beads₅₀The grain diameter is 30-50 nm; the length of the carbon nano tube is 7-15 μm.

Preferably, the structure control agent is hydroxyl silicone oil and ethyl hydrogen-containing silicone oil in a weight ratio of 2-5: 1-3.

The silicone rubber tube can be prepared according to a conventional silicone rubber tube preparation process.

The silicone rubber cable protection pipe comprises a silicone rubber pipe and a glass fiber braided layer wound on the outer surface of the silicone rubber pipe, and has the high and low temperature resistance of silicone rubber and the glass fiberThe protection effect is enhanced, and the protection tube has excellent performance by matching the protection effect and the protection effect; in the preparation process of the composite filler, hexagonal boron nitride with different shapes, spherical nano zinc oxide, glass beads, carbon nano tubes, nano calcium carbonate and cerium carbonate are specifically selected as raw materials in the raw materials of the silicone rubber tube, the raw materials are added into a nitric acid aqueous solution for soaking to change the surface property of the raw materials, and then dodecyl trimethoxy silane, gamma-urea propyl trimethoxy silane and vinyl tri-tert-butoxy silane are used for modifying the raw materials, and a plurality of coupling agents are introduced to the surface of the raw materials to obtain the composite filler, the unsaturated double bonds on the surface of the silicone rubber can react with the silicone rubber to form covalent bonds in the vulcanization process of the silicone rubber, so that the silicone rubber tube has the function of a bridge, the composite filler is more uniformly dispersed in the system, and the obtained silicone rubber tube has more excellent mechanical property, aging resistance, water resistance and heat resistance stability; the cage octa (dimethylsiloxy) silsesquioxane, the tetramethyl tetravinylcyclotetrasiloxane and the maleamic acid are added into the system for matching, so that the heat resistance and the strength of the silicone tube are further improved, and the tensile strength of the silicone rubber tube reaches more than 1 MPa; in a preferred mode, specific methyl phenyl vinyl silicone rubber and methyl vinyl silicone rubber are specifically selected as raw materials, and the proportion of the two is controlled, so that the two are blended, the vulcanization activity is kept, and meanwhile, phenyl is introduced, and the mechanical property and the heat resistance of the protection tube are improved; specifically, layered hexagonal boron nitride D with the average grain diameter of 350-550nm is selected₅₀Spherical nano zinc oxide and D with particle size of 50-80nm₅₀Glass beads with the particle size of 30-50nm and carbon nano tubes with the length of 7-15 mu m are used as raw materials, so that fillers with different particle sizes and different shapes are matched to play a synergistic effect, and after the glass beads are matched with nano calcium carbonate and cerium carbonate, the mechanical property of the obtained silicone tube is optimal, and the thermal-oxidative aging resistance is better; the flame retardant specifically selects the raw materials of the pyrophosphoric acid dimelamine, the magnesium borate whisker, the zirconium phosphate, the resorcinol bis (diphenyl phosphate) and the sepiolite, controls the mass ratio of the raw materials and endows the silicone tube with excellent flame retardant performance.

The performance of the silicone tube used in the invention is detected, and the test shows that the vertical burning test of the silicone tube is UL-94V-0 grade, and the oxygen index reaches more than 34.1 percent; after being placed in a closed 70 ℃ water bath environment for 168 hours, the alloy still can pass UL-94V-0 level, and the weight loss rate is below 0.36 percent; the tensile strength retention rate is above 95.62% after 480h thermal oxidation aging at 70 ℃.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to specific examples.