Pressure-resistant weather-resistant TPE floating cable foamed material and preparation method thereof

Abstract

The application relates to a pressure-resistant weather-resistant TPE floating cable foaming material and a preparation method thereof. 1. The TPE floating cable foaming material is obtained by the following raw materials and a closed foaming process; TPE 100 parts, hydrophobic filling material 17-28 parts, polystyrene derivative 26-42 parts, compatibility agent 2.5-5.5 parts, processing aid 1-5 parts and foaming agent 3.5-5 parts; the hydrophobic filling material is composed of cage polysilsesquioxane and octa-epoxy nano silicon dioxide dispersion and hydrophobic hollow glass microspheres; the polystyrene derivative is at least two of styrene-ethylene-butylene-styrene block copolymer, polystyrene and poly(septyl isobutyl cage polysilsesquioxane propyl methyl methacrylate), and polystyrene-poly(4-[N,N-bis trimethylsilyl]-aminomethyl); and the styrene-ethylene-butylene-styrene block copolymer is one of the polystyrene derivatives. The TPE floating cable foaming material has better physical properties, weather resistance and durability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thermoplastic elastomer foaming materials, more particularly, it relates to a kind of anti-pressure weather-resistant TPE floating cable foaming material and preparation method thereof. BACKGROUND

[0002] In the field of thermoplastic elastomer foaming materials, significant development has been made in recent years. This kind of material has important application value in many industries due to its unique performance. In the application of cables for water-related equipment, the demand for materials with specific performance is increasingly urgent. With the continuous progress of water floating solar energy, underwater robots, pool robots and offshore operation machinery and other fields, the performance of the cable materials directly affects the operation stability and service life of these equipment. High-performance cable materials have become a key factor in promoting the further development of related industries.

[0003] In the past, in order to meet the use requirements of water and underwater cables, the industry usually uses some traditional materials and processes. For example, ordinary thermoplastic elastomer materials are often used, but these materials often need additional processing when dealing with complex use environments. Some use conventional fillers to improve certain properties, such as increasing weight or improving certain strength; some will simply modify the material in order to improve its water resistance. In addition, in the processing process, ordinary extrusion processing is often used to form the outer sheath and other parts of the cable. However, these conventional methods can solve some problems to a certain extent, but they are difficult to meet the increasingly stringent actual use requirements.

[0004] The existing conventional materials and processes have obvious defects. The materials currently used have low resistance to environmental factors such as seawater, water and sunlight, especially when they are in deep water and high pressure environment for a long time, the materials are prone to damage and water penetration. Moreover, the surface of the cable is severely worn during long-term pulling, which greatly affects the service life and safety of the cable, and cannot well adapt to the complex and harsh use environment of water and underwater. SUMMARY

[0005] The purpose of the present application is to overcome the above technical problems, and provide an anti-pressure weather-resistant TPE floating cable foaming material and preparation method thereof

[0006] In the first aspect, the present application provides an anti-pressure weather-resistant TPE floating cable foaming material, which is composed of the following weight parts of raw materials and obtained by a closed-cell foaming process;

[0007] TPE 100 parts

[0008] Hydrophobic filler 17-28 parts

[0009] polystyrene derivatives 26-42 parts

[0010] compatibilizers 2.5-5.5 parts

[0011] processing aids 1-5 parts

[0012] foaming agents 3.5-5 parts

[0013] The hydrophobic filler is composed of cage polysilsesquioxane · octa-epoxy nano-silica dispersion and hydrophobic hollow glass microspheres; the polystyrene derivatives are at least two of styrene-ethylene-butylene-styrene block copolymer, polystyrene · poly(septyl isobutyl cage polysilsesquioxane propyl · methacrylate), and polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl), and one of them is styrene-ethylene-butylene-styrene block copolymer.

[0014] By adopting the above technical solution, the cage polysilsesquioxane · octa-epoxy nano-silica dispersion in the hydrophobic filler can improve salt corrosion resistance and weather resistance, the hydrophobic hollow glass microspheres can reduce material density, improve buoyancy, avoid water seepage and reduce water adsorption, and the two can form a double water barrier to reduce water absorption and optimize the cell structure; the styrene-ethylene-butylene-styrene block copolymer in the polystyrene derivative provides elastic-rigid balance, natural weather resistance and hydrolysis resistance, the polystyrene · poly(septyl isobutyl cage polysilsesquioxane propyl · methacrylate) enhances ultraviolet resistance, and the polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl) reduces surface energy and improves compression resilience, and the three can realize three-level weather protection and multi-scale reinforcement to improve the compression resistance and environmental aging resistance of the material; the compatibilizer promotes interface bonding; the foaming agent controls cell uniformity; the processing aid can optimize processing flowability and inhibit long-term hydrolysis; the overall realizes multiple durability of salt resistance, weather resistance (ultraviolet resistance), and hydrolysis resistance, guarantees the lightweight and high-strength characteristics of buoyancy and compression resistance, adapts to the processing-friendly characteristics of extrusion / injection molding, so that the material has low water absorption, high weather resistance, and strong compression resistance, and is suitable for harsh water and underwater environments to improve the durability and operation stability of cables and other equipment.

[0015] Optionally, the hydrophobic filler is composed of cage polysilsesquioxane · octa-epoxy nano-silica dispersion and hydrophobic hollow glass microspheres in a weight ratio of 1: (2-5).

[0016] By adopting the above technical scheme, the hydrophobic filler is composed of a cage-type polyhedral oligomeric silsesquioxane · octa-epoxy nano-silicon dioxide dispersion and hydrophobic hollow glass microspheres in a specific weight ratio, and the TPE, the specific polystyrene derivative, the compatibilizer, the processing aid and the foaming agent are combined through the closed-cell foaming process, so that the material has low water absorption, and a double water-blocking barrier is formed by the synergistic effect of the two; it has high weather resistance, the Si-O skeleton of POSS-SiO2 reflects ultraviolet light to enhance weather resistance; it has strong pressure resistance, HGMB reduces material density and improves buoyancy with the characteristics of light weight and high strength, and the two optimize the pore structure by stress dispersion to reduce water penetration channels; at the same time, the material achieves good mechanical properties, foaming quality, and has good deep-sea pressure resistance and environmental durability.

[0017] Preferably, the polystyrene derivative is composed of styrene-ethylene-butylene-styrene block copolymer, polystyrene · poly(septisobutylcage-type polyhedral oligomeric silsesquioxane propyl · methacrylate), and polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl) in a weight ratio of 10:(1.5-2.8):(1.2-1.5).

[0018] By adopting the above technical scheme, the polystyrene derivative is composed of styrene-ethylene-butylene-styrene block copolymer, polystyrene · poly(septisobutylcage-type polyhedral oligomeric silsesquioxane propyl · methacrylate), and polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl) in a specific weight ratio, which can make them work synergistically to further improve the comprehensive performance of the TPE floating cable foaming material, so that the material has a deep-sea pressure resistance level as high as S level (closed cell rate attenuation rate ≦0.5%), and the elongation retention rate is above 95%, and can also cooperate with the hydrophobic filler, the compatibilizer, the processing aid, the foaming agent and the TPE to make the material have low water absorption, high weather resistance and strong pressure resistance, adapt to harsh water / submarine environment, and improve the durability and operation stability of the cable equipment.

[0019] Preferably, the compatibilizer is a mixture of maleic rosin, EMA-g-GMA, stearic acid grafted SEBS, and maleic anhydride grafted polyethylene wax.

[0020] By adopting the above technical scheme, using a variety of mixtures as the compatibilizer can promote the interface bonding and chemical bonding between the components of the material, and the other raw materials are combined through the closed-cell foaming process to obtain the pressure-resistant and weather-resistant TPE floating cable foaming material, so that the elastomer has triple durability, realizes salt resistance, weather resistance and hydrolysis resistance, and has the characteristics of light weight and high strength, guarantees the buoyancy and pressure resistance, and is also suitable for extrusion / injection molding to meet the complex cable structure requirements.

[0021] Preferably, the compatibilizer is composed of maleic rosin, EMA-g-GMA, stearic acid grafted SEBS, and maleic anhydride grafted polyethylene wax.

[0022] By adopting the technical scheme, the hydrophobic filler is composed of cage polysilsesquioxane·octa-epoxy nano-silica dispersion and hydrophobic hollow glass microspheres, which cooperatively form a double water-blocking barrier to reduce the water absorption rate and optimize the cell structure; the polystyrene derivative is composed of at least two of styrene-ethylene-butylene-styrene block copolymer and the like, to realize three-level weather protection and multi-scale enhancement; when the compatibilizer is composed of maleic rosin, EMA-g-GMA, stearic acid grafted SEBS, and maleic anhydride grafted polyethylene wax, the substances jointly act to make the material have low water absorption rate, high weather resistance, strong pressure resistance, and good foaming quality, meet the qualified standards of mechanical properties, and be applicable to water / water cable, significantly improving the durability and operation stability of the cable equipment.

[0023] Preferably, the TPE is composed of multiple kinds of TPEE, TPAE, TPSIV, and TPU.

[0024] By adopting the technical scheme, the TPE is composed of multiple kinds of TPEE, TPAE, TPSIV, and TPU, and the closed-cell foaming process is used in cooperation with specific proportions of the hydrophobic filler, the polystyrene derivative, the compatibilizer, the processing aid, and the foaming agent, so that the pressure-resistant and weather-resistant TPE floating cable foaming material has low water absorption rate, high weather resistance, and strong pressure resistance, can perfectly adapt to the harsh environment on water / under water, and significantly improves the durability and operation stability of the cable equipment. Moreover, this combination can exert the characteristic advantages of different TPE materials, and further optimize the performance of the elastomer.

[0025] Preferably, the processing aid is a mixture of multiple kinds of nano-silver, PE wax, anti-UV agent, and anti-oxidant.

[0026] By adopting the technical scheme, the nano-silver, PE wax, anti-UV agent, and anti-oxidant are mixed as the processing aid, and the closed-cell foaming process is used in cooperation with TPE, the hydrophobic filler, the polystyrene derivative, the compatibilizer, and the foaming agent to prepare the pressure-resistant and weather-resistant TPE floating cable foaming material. The nano-silver can inhibit the breeding of bacteria and other microorganisms, the PE wax can optimize the material processing fluidity, the anti-UV agent can enhance the material ultraviolet resistance, and the anti-oxidant can inhibit the long-term hydrolysis of the material, so that the thermoplastic elastomer has good antibacterial, processing, ultraviolet resistance, and hydrolysis resistance, improves the comprehensive performance of the material, meets the qualified standards of mechanical properties, foaming quality, deep-sea high pressure, environmental durability, and the like, and is applicable to various application scenarios such as water floating solar cable and underwater robot cable.

[0027] In a second aspect, a preparation method of the pressure-resistant weather-resistant TPE floating cable foamed material is prepared by the following method: melt blending: weighing the hydrophobic filler, polystyrene derivative, compatibilizer, TPE, and processing aid according to the weight parts, pre-mixing uniformly, heating to melt blend uniformly, cooling, then adding the foaming agent, mixing uniformly, extruding and granulating to obtain the masterbatch A;

[0028] The masterbatch A is physically foamed to obtain the TPE floating cable foamed material for cable sheath or buoyancy block.

[0029] By adopting the above technical solution, the preparation method can prepare the pressure-resistant weather-resistant TPE floating cable foamed material with triple durability, realizing salt resistance, weather resistance, and hydrolysis resistance; having the characteristics of light weight and high strength, which can guarantee buoyancy and pressure resistance; and being processing-friendly, suitable for extrusion / injection molding, and meeting the complex cable structure requirements. At the same time, the hydrophobic filler, polystyrene derivative, compatibilizer, TPE, processing aid, and foaming agent can be fully mixed and reacted, the synergistic effect of each raw material can be played, and the prepared TPE floating cable foamed material can meet the qualified standards of mechanical performance, foaming quality, and other tests.

[0030] Preferably, the foaming agent is foaming agent H.

[0031] By adopting the above technical solution, in the process of weighing the hydrophobic filler, polystyrene derivative, compatibilizer, TPE, and processing aid according to the weight parts, pre-mixing uniformly, heating to melt blend uniformly, cooling, then adding the foaming agent H to continue mixing uniformly and extruding and granulating to obtain the masterbatch A, and then physically foaming the masterbatch A, the foaming agent H plays a foaming role, cooperates with the TPE, hydrophobic filler, polystyrene derivative, compatibilizer, and processing aid, and obtains the pressure-resistant weather-resistant TPE floating cable foamed material through the closed-cell foaming process. The elastomer has triple durability, realizes salt resistance, weather resistance, and hydrolysis resistance, has the characteristics of light weight and high strength, reduces the density while improving the strength, guarantees buoyancy and pressure resistance, and has good processing-friendly property, is suitable for extrusion / injection molding, meets the complex cable structure requirements.

[0032] Preferably, the foaming temperature is 198-208℃, the foaming pressure is 40-50MPa, and the foaming time is 5-10min.

[0033] By adopting the technical scheme, the hydrophobic filler, polystyrene derivative, compatibilizer, TPE and processing aid are uniformly premixed according to specific weight parts, heated to melt and uniformly blend, and after cooling, a foaming agent is added to uniformly mix and extrude to obtain master batch A. The master batch A is foamed at a foaming temperature of 198-208 DEG C and a foaming pressure of 40-50 MPa for 5-10 min, so that the raw materials can fully react and foam, and the TPE foaming material for cable sheath or buoyancy block is prepared, which meets the mechanical performance test standard (compression strength > 2 MPa, compression permanent deformation < 25%, tensile strength > 10 MPa, elongation at break > 400%, mass loss < 50 mg), and the foaming quality standard (cell size 10-30 um), so that the TPE foaming material for cable sheath or buoyancy block has good compression resistance, tensile property and wear resistance, and has low closed cell rate attenuation rate in deep sea high pressure test, and has good ultraviolet aging resistance and high temperature and high salt aging resistance.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. The cage polysilsesquioxane · octa-epoxy nano-silicon dioxide in the hydrophobic filler cooperates with the hydrophobic hollow glass microbeads to form a double water-blocking barrier, reduces the water absorption rate, reduces the water seepage channel, improves the material salt corrosion resistance, weather resistance, reduces the material density, and improves the buoyancy;

[0036] 2. The styrene-ethylene-butylene-styrene block copolymer, polystyrene · poly(septisilane cage polysilsesquioxane propyl · methacrylate), and polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl) in the polystyrene derivative cooperatively realize three-level weather protection and multi-scale enhancement, and improve the material compression resistance and environmental aging resistance;

[0037] 3. The compatibilizer promotes the interface combination to form chemical bonding, the foaming agent controls the uniformity of the cell, the lubricant optimizes the processing flowability, and the hydrolysis inhibitor inhibits long-term hydrolysis, thereby improving the comprehensive performance of the material. DETAILED DESCRIPTION

[0038] The present application is further described below in combination with examples.

[0039] Part of the raw material source

[0040] The hydrophobic hollow glass microbeads are 1,3-bis(3-methacryloyloxypropyl) tetra(trimethylsiloxy) disiloxane surface modified hollow glass microbeads, and the weight ratio of 1,3-bis(3-methacryloyloxypropyl) tetra(trimethylsiloxy) disiloxane to hollow glass microbeads is 10:0.3;

[0041] The molecular weight structure of the cage polysilsesquioxane · octa-epoxy nano-silicon dioxide dispersion is as follows:

[0042]

[0043] The molecular structure of polystyrene-poly(4-[N,N-bis-trimethylsilyl]-aminomethyl) is as follows, wherein n is 100-500; m is 20-50;

[0044]

[0045] The molecular formula of polystyrene-poly(septakis-isobutylcage polysilsesquioxane-based propyl-methacrylate) is as follows: molecular formula: [C8H8] n [C4H5O2-(CH2)3-Si8O 12 (C4H9)7] m wherein n is 100-500; m is 10-30;

[0046] The number average molecular weight of styrene-ethylene-butylene-styrene block copolymer is 90-100 thousand;

[0047] The maleic rosin is ML-103 from Haizhao Chemical Industry Co., Ltd.;

[0048] EMA-g-GMA (poly(ethylene-methyl acrylate)-graft-glycidyl methacrylate) is Elvaloy PTW from DuPont;

[0049] The maleic anhydride grafted polyethylene wax is HI-WAX 1105A from Mitsui Chemicals;

[0050] The TPEE is Hytrel G3548 low-temperature-resistant TPEE from DuPont, which has a Shore hardness of 24D±2D;

[0051] The TPAE is 3533SP01 from Arkema;

[0052] The TPSIV is Dow Corning 3040-70A;

[0053] The TPU is Bafine 560APTSG;

[0054] The nano-silver is RS-LZY from Fujian Ruison New Material Co., Ltd.;

[0055] The number average molecular weight of PE wax is 1500-3500;

[0056] The anti-UV agent is 234 ultraviolet absorber;

[0057] The antioxidant is antioxidant 1076.

[0058] Embodiment

[0059] Embodiment 1

[0060] A pressure-resistant weather-resistant TPE floating cable foaming material is prepared by the following method:

[0061] The hydrophobic filler is composed of cage polysilsesquioxane · octa-epoxy nano-silica dispersion and hydrophobic hollow glass microspheres in a weight ratio of 1:2;

[0062] The polystyrene derivative is obtained by uniformly mixing styrene-ethylene-butylene-styrene block copolymer and polystyrene · poly(septyl isobutyl cage polysilsesquioxane propyl · methacrylate) in a weight ratio of 11:3.

[0063] The compatibilizer is composed of maleic rosin, EMA-g-GMA, and maleic anhydride grafted polyethylene wax in a weight ratio of 3:1:1.

[0064] The TPE is composed of TPEE, TPAE, TPSIV, and TPU in a weight ratio of 5:1:1:3.

[0065] The processing aid is composed of nano-silver, PE wax, anti-UV agent, and antioxidant in a weight ratio of 3:1:1:1.

[0066] Melt blending: 28 parts of the hydrophobic filler, 26 parts of the polystyrene derivative, 5.5 parts of the compatibilizer, 100 parts of the TPE, and 1 part of the processing aid are uniformly premixed according to weight parts, then heated to 230℃ at a rate of 10℃ / min, so that the materials are fully melted and uniformly mixed, then cooled to 150℃, then 3.5 parts of the foaming agent H is added and fully mixed, then transferred to an extruder, the materials are extruded, water-cooled in a water cooling device, then pelletized in a pelletizer, the pellets are dried in an oven at 50℃ for 2h, and a masterbatch A is obtained;

[0067] The masterbatch A is physically foamed at a foaming temperature of 200℃, a foaming pressure of 50MPa, and a foaming time of 5min, and a TPE floating cable foaming material for cable sheath or buoyancy block is obtained.

[0068] Example 2-3

[0069] Example 2-3 differs from example 1 in that the amount of raw materials is different, as shown in Table 1;

[0070] Table 1 Amount of raw materials (weight parts) of examples 1-3

[0071]

[0072] Example 4

[0073] Example 4 differs from Example 2 in that the polystyrene derivative consists of styrene-ethylene-butylene-styrene block copolymer, polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl) in a weight ratio of 11:3.

[0074] Example 5

[0075] Example 5 differs from Example 2 in that the polystyrene derivative consists of styrene-ethylene-butylene-styrene block copolymer, polystyrene-poly(septaisobutylcage poly silesquioxane propyl methacrylate), polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl) in a weight ratio of 10:1.5:1.5.

[0076] Example 6

[0077] Example 6 differs from Example 2 in that the polystyrene derivative consists of styrene-ethylene-butylene-styrene block copolymer, polystyrene-poly(septaisobutylcage poly silesquioxane propyl methacrylate), polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl) in a weight ratio of 10:2.3:1.4.

[0078] Example 7

[0079] Example 7 differs from Example 2 in that the polystyrene derivative consists of styrene-ethylene-butylene-styrene block copolymer, polystyrene-poly(septaisobutylcage poly silesquioxane propyl methacrylate), polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl) in a weight ratio of 10:2.8:1.2.

[0080] Example 8

[0081] Example 8 differs from Example 2 in that the compatibilizer consists of maleic rosin and maleic anhydride grafted polyethylene wax in a weight ratio of 1:1.

[0082] Example 9

[0083] Example 9 differs from Example 2 in that the compatibilizer is maleic anhydride grafted polyethylene wax.

[0084] Comparative Example

[0085] Comparative Example 1

[0086] Comparative Example 1 differs from Example 2 in that the polystyrene derivative is replaced with TPE in equal amounts.

[0087] Comparative Example 2

[0088] Comparative Example 2 differs from Example 2 in that the hydrophobic filler is replaced with talc in equal amounts.

[0089] Comparative Example 3

[0090] Comparative Example 3 differs from Example 2 in that the cage polysilsesquioxane · octa-epoxy nano-silica dispersion is replaced with an equal amount of hydrophobic hollow glass microbeads.

[0091] Comparative Example 4

[0092] Comparative Example 4 differs from Example 2 in that the hydrophobic hollow glass microbeads are replaced with an equal amount of cage polysilsesquioxane · octa-epoxy nano-silica dispersion.

[0093] Comparative Example 5

[0094] Comparative Example 5 differs from Example 2 in that the polystyrene · poly(septaisobutyl cage polysilsesquioxane-based propyl · methacrylate) is replaced with an equal amount of styrene-ethylene-butylene-styrene block copolymer.

[0095] Performance Test Test

[0096] The master batch A obtained from Examples 1-9 and Comparative Examples 1-5 was physically foamed at a foaming temperature of 200°C, a foaming pressure of 50 MPa, and a foaming time of 5 min, to obtain samples for the following experiments, respectively.

[0097] Test Method / Testing Method

[0098] I. Mechanical Property Test

[0099] (1) Test Method: ASTM D1621 (compressive strength) and ASTM D624 (compression set).

[0100] Acceptance Criteria: Compressive strength > 2 MPa (underwater cable support requirement), compression set < 25% (test condition 150°C / 22h), pass, otherwise fail.

[0101] (2) Tensile Property

[0102] Test Method: Refer to ASTM D412 to test tensile strength and elongation at break.

[0103] Acceptance Criteria: Tensile strength > 10 MPa, elongation at break > 400%, ensure dynamic bending resistance, pass, otherwise fail.

[0104] (3) Abrasion Resistance Test Method: Taber Abrasion Test (CS-17 wheel, 1000 times), speed: 72 rpm, load: 1000 g.

[0105] The mass before and after the wear resistance test is measured, and the mass loss is calculated. If the mass loss is < 50 mg, it is qualified. The TPE floating cable foam material produced by the standard is suitable for frequent friction scenarios (such as underwater robot cables). If the mass loss is >= 50 mg, it is unqualified.

[0106] If any of (1)-(3) is unqualified, it is recorded as mechanical performance unqualified.

[0107] II. Foaming quality

[0108] Test method: observe the cell size and distribution under an optical microscope at 500x magnification.

[0109] Index requirements: cell size 10-30 μm, qualified, and exceeding this range is unqualified.

[0110] III. Deep-sea high-pressure test Test method: high-pressure autoclave simulation of water depth (1 MPa = 100 m). Index requirements: 5 wt% sodium chloride concentration in water, temperature 4°C, complete immersion time 7 days, water pressure 20 MPa (equivalent depth 2000 m), after removal, air-dry the surface to express the moisture, and use SEM + image analysis for analysis, with an accelerating voltage of 5 kV and a resolution of 1 nm. The porosity obtained after deep-sea testing is compared with the porosity before deep-sea testing, and the closed-cell rate decay rate (equal to the porosity before deep-sea testing minus the porosity after deep-sea testing) is calculated. When the closed-cell rate decay rate is <= 0.5%, it is recorded as S grade; when 0.5% < closed-cell rate decay rate <= 1.0%, it is recorded as A grade; when 1% < closed-cell rate decay rate <= 1.5%, it is recorded as B grade; when 1.5% < closed-cell rate decay rate <= 2.0%, it is recorded as C grade; and when the closed-cell rate decay rate > 2%, it is recorded as D grade.

[0111] 1. Environmental durability test

[0112] UV aging resistance: tested using a UV aging test chamber, with UV test conditions: 8 hours per cycle, a total of 100 cycles.

[0113] Among them, ultraviolet irradiation for 4 hours (lamp tube UVA-340 nm, power 0.63 W / (m2·nm) and temperature 85°C), 4 hours of humidity (temperature 85°C, environmental humidity 85%) each cycle test without stopping until the test is completed.

[0114] High temperature and high salt aging: tested using a salt spray chamber, with test conditions 70°C / 95% RH, 1000h; salt water content 10wt%.

[0115] The experimental data of Examples 1-9 and Comparative Examples 1-5 are shown in Table 2.

[0116] Table 2 Experimental data of Examples 1-9 and Comparative Examples 1-5

[0117]

[0118] It can be seen from the combination of Example 2 and Comparative Examples 1-5 and Table 2 that the physical properties of Comparative Examples 1-5 are unqualified, and the deep-sea pressure resistance grade is C or D, while Example 2 reaches A, indicating that the closed cell rate decay rate of Example 2 is less, and the deep-sea pressure resistance performance is better. At the same time, the elongation at break retention rate of Comparative Examples 1-5 is lower than that of Example 2, indicating that the sample of Example 2 has both ultraviolet aging resistance and high temperature and high salt aging resistance performance. It can be seen that in Comparative Examples 1-5, the technical solution of the present application is changed, such as not adding polystyrene derivative in Comparative Example 1, not adding hydrophobic filler in Comparative Example 2, replacing the hydrophobic filler with talc in Comparative Example 3, or only adding cage polysilsesquioxane·octa-epoxy nano silica dispersion or hydrophobic hollow glass microspheres in Comparative Examples 3-4, and further not adding polystyrene·poly(septisobutyl cage polysilsesquioxane propyl methyl methacrylate) in Comparative Example 5, which leads to unqualified physical properties (one of the physical property tests is not within the qualified range, such as not reaching the basic standards of compression strength > 2 MPa, compression permanent deformation < 25%, mass loss < 50 mg, tensile strength > 10 MPa, and elongation at break > 400%). It further indicates that the hydrophobic filler and polystyrene derivative are used to blend modify the TPE, and then combined with the compatibilizer and processing aid to obtain better performance, and the foaming agent plays a foaming role, and the hydrophobic filler is composed of cage polysilsesquioxane·octa-epoxy nano silica dispersion and hydrophobic hollow glass microspheres; and has a synergistic effect, the polystyrene derivative is at least two of styrene-ethylene-butylene-styrene block copolymer, polystyrene·poly(septisobutyl cage polysilsesquioxane propyl methyl methacrylate), and polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl), and one of them is styrene-ethylene-butylene-styrene block copolymer, and then combined with the hydrophobic filler to make the TPE floating cable foaming material have better comprehensive performance.

[0119] Comparative Example 2 and Examples 5-7 can be seen that the deep-sea pressure resistance grade of Examples 5-7 is as high as S (closed cell rate decay rate ≦ 0.5%), and the elongation at break retention rate (%) is all above 95%, even as high as 97.5%, while the elongation at break retention rate of Example 2 is all below 94%, even as low as 92.5%, so it can be seen that the styrene-ethylene-butylene-styrene block copolymer, polystyrene·poly(septisobutyl cage polysilsesquioxane propyl methyl methacrylate), and polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl) used in the present application have a synergistic effect, further improving the comprehensive performance of the TPE floating cable foaming material.

[0120] The embodiments are only illustrative of the present application, and are not intended to limit the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A pressure-resistant and weather-resistant TPE floating cable foam material, characterized in that, It is composed of the following raw materials in parts by weight and obtained through a closed-cell foaming process; 100 TPE 17-28 parts of hydrophobic filler 26-42 parts of polystyrene derivatives Compatibilizer 2.5-5.5 parts 1-5 parts of processing aids 3.5-5 parts foaming agent; The hydrophobic filler is composed of cage-type polysilsesquioxane-octa-epoxy nano-silica dispersion and hydrophobic hollow glass microspheres; the polystyrene derivative is composed of at least two of the following: styrene-ethylene-butene-styrene block copolymer, polystyrene-poly(heptaisobutyl cage-type polysilsesquioxane alkylpropyl methacrylate), and polystyrene-poly(4-[N,N-bistrimethylsilyl]-aminomethyl), and one of them is styrene-ethylene-butene-styrene block copolymer; the hydrophobic filler is composed of cage-type polysilsesquioxane-octa-epoxy nano-silica dispersion and hydrophobic hollow glass microspheres in a weight ratio of 1:(2-5); The polystyrene derivative is composed of styrene-ethylene-butene-styrene block copolymer, polystyrene·poly(heptaisobutyl cage polysilsesquioxane alkylpropyl methacrylate), and polystyrene·poly(4-[N,N-bistrimethylsilyl]-aminomethyl) in a weight ratio of 10:(1.5-2.8):(1.2-1.5); The compatibilizer is a mixture of several of the following: maleic rosin, EMA-g-GMA, stearic acid grafted SEBS, and maleic anhydride grafted polyethylene wax; the processing aid is a mixture of several of the following: nano silver, PE wax, UV stabilizer, and antioxidant; and the foaming agent is foaming agent H.

2. The pressure-resistant and weather-resistant TPE floating cable foam material according to claim 1, characterized in that: The compatibilizer is composed of maleic rosin, EMA-g-GMA, stearic acid-grafted SEBS, and maleic anhydride-grafted polyethylene wax.

3. The pressure-resistant and weather-resistant TPE floating cable foam material according to claim 1, characterized in that: The TPE is composed of various components such as TPEE, TPAE, TPSIV, and TPU.

4. A method for preparing a pressure-resistant and weather-resistant TPE floating cable foam material as described in any one of claims 1-3, characterized in that, It is prepared by the following method: Melt blending: Weigh out the hydrophobic filler, polystyrene derivative, compatibilizer, TPE and processing aid by weight, premix them evenly, heat until melt blending is uniform, cool down, add foaming agent, mix evenly, extrude and granulate to obtain masterbatch A. Masterbatch A is physically foamed to obtain TPE floating cable foam material for cable sheathing or buoyancy blocks.

5. The method for preparing a pressure-resistant and weather-resistant TPE floating cable foam material according to claim 4, characterized in that: The foaming temperature is 198-208℃, the foaming pressure is 40-50MPa, and the foaming time is 5-10min.

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