Whisker modified TPU cable material and preparation method thereof

Abstract

The invention relates to the technical field of TPU (thermoplastic polyurethane) materials, in particular to a whisker modified TPU cable material, which is prepared from the following raw materials in parts by weight: 70 to 90 parts of thermoplastic polyether-based polyurethane, 10 to 20 parts of ethylene-vinyl acetate copolymer, 10 to 15 parts of modified cellulose whisker, 5 to 10 parts of modified calcium sulfate whisker and 3 to 5 parts of lubricating agent. The whisker modified TPU cable material produced by the invention has the characteristics of excellent flexibility, wear resistance and flame retardance and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of TPU materials, and in particular to a whisker-modified TPU cable material and a preparation method thereof. Background Art

[0002] With the rapid development of my country's power industry, the demand for cable materials has gradually increased. At the same time, in order to ensure the safe use of wires and cables during operation, the country's performance requirements for cable materials are getting higher and higher. The conventionally used PVC cable materials contain a large amount of chlorine, which will emit a large amount of harmful gases such as hydrogen chloride and dioxane after combustion, which is easy to cause harm to human health and the environment. In addition, its resistance to hot oil, corrosion and organic solvents is poor, and it is easy to break and crack in special environments.

[0003] Thermoplastic polyurethane (TPU) has good mechanical properties, especially excellent wear resistance, so it is also widely used in the field of wires and cables, and is often used as a coating material for wires and cables. However, for cable materials, TPU is not flexible enough due to its high hardness, and does not meet the requirements of coating materials for flexibility, which limits its application in the field of wires and cables. At the same time, during the long-term use of TPU, the surface will be worn, affecting the service life of TPU.

[0004] Whiskers refer to whisker-like single crystals that grow in the form of single crystals and are similar to fibers or needles, and are much smaller than short fibers. Since the atomic structure of whiskers is highly ordered during crystallization, there are no major defects that can weaken the crystal. Therefore, whisker materials often have excellent high temperature resistance, high heat resistance, corrosion resistance, electrical insulation and other properties. At the same time, they also have extremely high mechanical properties, such as high strength, high elastic modulus, and high hardness. Using them as reinforcing materials for TPU can further improve the various properties of TPU, especially the improvement of TPU's wear resistance can solve the problem of its easy wear during long-term use. However, the compatibility of whiskers and TPU materials needs to be further improved.

[0005] Patent CN113861664B provides a wear-resistant and flame-retardant TPU and a preparation method thereof. The wear resistance of TPU is improved by adding dihydrate calcium sulfate whiskers and nano-alumina modified with tetrabutyl titanate to TPU. However, tetrabutyl titanate is expensive and toxic, and is mostly used as a catalyst. In addition, the binding force with calcium sulfate whiskers is poor.

[0006] Patent CN115677967A provides a wear-resistant and weather-resistant TPU material for casters and a preparation method thereof. The wear resistance of TPU is improved by adding potassium hexatitanate whiskers modified by a titanate coupling agent to TPU. However, the price of potassium hexatitanate whiskers is relatively high and cannot meet the demand for low cable material costs.

[0007] Therefore, there is an urgent need in the market for a whisker-modified TPU cable material with excellent flexibility, wear resistance and flame retardancy and low cost. Summary of the invention

[0008] In view of the problems existing in the prior art, the object of the present invention is to obtain a whisker-modified TPU cable material which has excellent flexibility, wear resistance and flame retardancy and is low in cost.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] On one hand, the present invention provides a whisker-modified TPU cable material, which comprises the following raw materials, measured by weight: 70-90 parts of thermoplastic polyether-based polyurethane, 10-20 parts of ethylene-vinyl acetate copolymer, 10-15 parts of modified cellulose whiskers, 5-10 parts of modified calcium sulfate whiskers, and 3-5 parts of lubricant.

[0011] In some embodiments, the vinyl acetate content in the ethylene-vinyl acetate copolymer is 40-50 wt %.

[0012] Preferably, the vinyl acetate content in the ethylene-vinyl acetate copolymer is 46 wt%.

[0013] By selecting ethylene-vinyl acetate copolymer and thermoplastic polyether-based polyurethane for blending, the applicant can retain the excellent wear resistance and mechanical properties of thermoplastic polyether-based polyurethane, while at the same time imparting the good flexibility and processability of ethylene-vinyl acetate copolymer to the composite material, and can also reduce costs. Moreover, since both thermoplastic polyether-based polyurethane and ethylene-vinyl acetate copolymer contain ester groups, they have good compatibility. Due to its good compatibility with polyurethane, ethylene-vinyl acetate copolymer can play the role of a compatibilizer and promote the compatibility of whisker materials and polyurethane.

[0014] The applicant improved the wear resistance of TPU by adding modified cellulose whiskers and modified calcium sulfate whiskers into thermoplastic polyether-based polyurethane, thereby solving the problem of easy wear of TPU cable materials during long-term use.

[0015] In some embodiments, the method for preparing the modified cellulose whiskers comprises the following steps:

[0016] (1) placing the cellulose whiskers in a vacuum oven, heating the oven to 90-110° C. and dehydrating the whiskers for 6-12 hours to obtain dehydrated cellulose whiskers;

[0017] (2) adding the dehydrated cellulose whiskers obtained in step (1) into DMF, stirring evenly, and then sonicating for 1-2 hours to obtain a cellulose whisker solution;

[0018] (3) Add the cellulose solution obtained in step (2) into a reaction kettle, then add TDI, glycidyl acrylate and a catalyst, introduce nitrogen, heat to 75-85° C., react for 2-3 hours, take out the product, and dry it to obtain modified cellulose whiskers.

[0019] Preferably, the diameter of the cellulose whiskers is 10-50 nm.

[0020] Preferably, the catalyst is an organic bismuth catalyst.

[0021] Further preferably, the catalyst is of model DY-20.

[0022] In some embodiments, the weight ratio of the cellulose whiskers, DMF and catalyst is 10-15:20-30:0.01-0.1.

[0023] In some embodiments, the weight ratio of the cellulose whiskers, TDI and glycidyl acrylate is 10-15:2-3:1.5-2.5.

[0024] Cellulose whiskers are rigid rod-shaped particles with the characteristics of high strength, modulus, specific surface area and high crystallinity. Adding cellulose whiskers to TPU materials can improve the mechanical properties, wear resistance and flame retardancy of the materials. However, since cellulose whiskers contain a large number of hydroxyl groups, they are easy to aggregate in hydrophobic polymers, which can easily lead to deterioration of the performance of TPU materials. Therefore, it is necessary to improve their compatibility.

[0025] The applicant added TDI to react with the hydroxyl groups on the cellulose whiskers to generate carbamate groups. On the one hand, it reduced the hydroxyl content on the cellulose whiskers and increased the compatibility of the cellulose whiskers with TPU. On the other hand, it can produce hydrogen bonds with the carbamate groups in the polyurethane, further improving the combination of cellulose whiskers and TPU and promoting the dispersion of cellulose whiskers. At the same time, the applicant used glycidyl acrylate to react with another -NCO on TDI to introduce double bond groups on the cellulose whiskers, so that it can undergo polymerization reaction with ethylene-vinyl acetate copolymer during processing to improve the compatibility of cellulose whiskers with ethylene-vinyl acetate copolymer. In addition, the three double bond groups on the cellulose whiskers act as crosslinkers after reacting with ethylene-vinyl acetate copolymers, introducing an interpenetrating network structure in the system, further increasing the wear resistance of the TPU cable material.

[0026] In some embodiments, the modified calcium sulfate whisker is prepared by uniformly mixing calcium sulfate whisker and vinyltriethoxysilane to obtain the modified calcium sulfate whisker.

[0027] Preferably, the length of the calcium carbonate whiskers is 1-30 μm.

[0028] In some embodiments, the weight ratio of the calcium sulfate whiskers to vinyltriethoxysilane is 5-10:0.5-1.

[0029] The applicant further adds modified calcium sulfate whiskers on the basis of adding modified cellulose whiskers. On the one hand, the use of cellulose whiskers can be reduced to reduce production costs. On the other hand, by using vinyltriethoxysilane to modify calcium sulfate whiskers, double bond groups are introduced into the calcium sulfate whiskers, so that the calcium sulfate whiskers undergo double bond polymerization reaction with ethylene-vinyl acetate copolymer during processing, thereby promoting the compatibility of calcium sulfate whiskers with TPU and ethylene-vinyl acetate copolymer.

[0030] In some embodiments, the calcium sulfate whiskers are anhydrous calcium sulfate whiskers.

[0031] According to the different crystal water, calcium sulfate whiskers can be divided into dihydrate, hemihydrate and anhydrous calcium sulfate whiskers. Among them, anhydrous calcium sulfate whiskers have stable performance and are not easily hydrated. Adding anhydrous calcium sulfate whiskers to polymer materials can improve the mechanical properties of composite materials.

[0032] In some embodiments, the lubricant is one or more of silicone, polyolefin wax, stearate, and pentaerythritol stearate.

[0033] Preferably, the lubricant is silicone.

[0034] In some embodiments, the whisker-modified TPU cable material further contains 2-3 parts by weight of modified nano-sepiolite.

[0035] In some embodiments, the modified nano-sepiolite is prepared by uniformly mixing nano-sepiolite with KH550 and benzoyl peroxide to obtain the modified nano-sepiolite.

[0036] In some embodiments, the weight ratio of the nano-sepiolite, KH550, and benzoyl peroxide is 10-15:0.5-1:1-3.

[0037] Nano sepiolite is a hydrated magnesium silicate with a transitional structure of chain and layered fibers. This special structure gives nano sepiolite many special properties. Adding it to TPU cable materials can fill the gaps between whiskers and TPU to further improve the wear resistance, flame retardancy, acid and alkali resistance, weather resistance and aging resistance of TPU materials.

[0038] Benzoyl peroxide is a catalyst for double bond polymerization, but in the processing process, the amount of catalyst added is small, and it is easy to agglomerate and not easy to catalyze the double bond polymerization reaction. After a lot of attempts, the applicant found that this problem can be solved by mixing benzoyl peroxide with nano-sepiolite and then adding it. This may be because the layered porous structure of sepiolite can serve as a carrier of the catalyst, thereby improving the catalytic effect.

[0039] The applicant chose to use KH550 to modify nano-sepiolite, improving the dispersibility of nano-sepiolite while introducing amino groups into its structure so that it reacts with the remaining -NCO on the modified cellulose whiskers. On the one hand, this promotes the dispersion of the nano-sepiolite, and on the other hand, it transports the catalyst it carries to the vicinity of the double bonds on the nano-cellulose, promoting the occurrence of double bond polymerization reactions.

[0040] Another aspect of the present invention provides a method for preparing a whisker-modified TPU cable material, comprising the following steps:

[0041] (1) 15-25 wt% of ethylene-vinyl acetate copolymer and thermoplastic polyether-based polyurethane are produced in an automatic metering two-stage device to prepare a pre-mixed masterbatch, wherein the extrusion temperature range is 125-155° C.;

[0042] (2) The premixed masterbatch and the remaining ethylene-vinyl acetate copolymer, modified cellulose whiskers, modified calcium sulfate whiskers, and silicone are put into an internal mixer for blending, and granulated by a screw machine after 10-30 minutes at a processing temperature range of 125-155° C. to obtain a whisker-modified TPU cable material.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. The present invention obtains a whisker-modified TPU cable material having excellent flexibility, wear resistance and flame retardancy and low cost by blending ethylene-vinyl acetate with thermoplastic polyether polyurethane and adding cellulose whiskers and calcium sulfate whiskers.

[0045] 2. The present invention selects ethylene-vinyl acetate copolymer and thermoplastic polyether-based polyurethane to blend, and imparts the good flexibility and processability of ethylene-vinyl acetate copolymer to the composite material, which can also reduce costs. Moreover, since both thermoplastic polyether-based polyurethane and ethylene-vinyl acetate copolymer contain ester groups, they have good compatibility. By virtue of the good compatibility with polyurethane, ethylene-vinyl acetate copolymer can play the role of a compatibilizer and promote the compatibility of whisker materials with polyurethane.

[0046] 3. The present invention generates carbamate groups by adding TDI to react with the hydroxyl groups on the cellulose whiskers, which reduces the hydroxyl content on the cellulose whiskers and increases the compatibility of the cellulose whiskers with TPU on the one hand, and can produce hydrogen bonds with the carbamate groups in the polyurethane on the other hand, further improving the combination of the cellulose whiskers with TPU and promoting the dispersion of the cellulose whiskers. At the same time, the present invention uses glycidyl acrylate to react with another -NCO on TDI to introduce double bond groups on the cellulose whiskers, so that it can react with ethylene-vinyl acetate copolymers during processing to improve the compatibility of cellulose whiskers with ethylene-vinyl acetate copolymers. In addition, the three double bond groups on the cellulose whiskers act as crosslinking agents after reacting with ethylene-vinyl acetate copolymers, introducing an interpenetrating network structure in the system, and further increasing the wear resistance of the TPU cable material.

[0047] 4. The present invention further improves the wear resistance, acid and alkali resistance, weather resistance and aging resistance of the TPU material by adding nano-sepiolite. At the same time, it is found that nano-sepiolite can be used as a catalyst carrier. The present invention selects KH550 to modify the nano-sepiolite, improves the dispersibility of the nano-sepiolite, and introduces an amino group into its structure to react with the remaining -NCO on the modified cellulose whiskers. On the one hand, the dispersion of the nano-sepiolite is promoted, and on the other hand, the catalyst carried by the nano-sepiolite is transported to the vicinity of the double bonds on the nano-cellulose, promoting the occurrence of double bond polymerization reaction. DETAILED DESCRIPTION

[0048] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0049] In the following embodiments and comparative examples, except for modified cellulose whiskers, modified calcium sulfate whiskers and modified nano-sepiolite, the relevant reagents used can be purchased from the market. Among them, the thermoplastic polyether polyurethane with a grade of 1175AW was purchased from BASF of Germany, the ethylene-vinyl acetate copolymer with a vinyl acetate content of 46wt% was purchased from Dongguan Yingxiang Plastic Raw Materials Co., Ltd., the cellulose whiskers with a diameter of 10-50nm were purchased from Suzhou Beike Nano Technology Co., Ltd., the calcium sulfate whiskers with a length of 1-30μm were purchased from Hubei Langbowan Biomedicine Co., Ltd., and the nano-sepiolite was purchased from Jinan Mingxin Chemical Co., Ltd.

[0050] Preparation Example 1

[0051] The method for preparing modified cellulose whiskers comprises the following steps:

[0052] (1) placing 12 g of cellulose whiskers in a vacuum oven, heating to 100° C. and dehydrating for 10 h to obtain dehydrated cellulose whiskers;

[0053] (2) adding the dehydrated cellulose whiskers obtained in step (1) into 25 g of DMF, stirring evenly, and then sonicating for 1 h to obtain a cellulose whisker solution;

[0054] (3) The cellulose solution obtained in step (2) was added to a reaction kettle, and then 2.5 g of TDI, 2 g of glycidyl acrylate and 0.01 g of DY-20 were added, nitrogen was introduced, the temperature was raised to 80° C., the reaction was carried out for 2 h, the product was taken out, and the modified cellulose whiskers were obtained after drying.

[0055] Preparation Example 2

[0056] The preparation method of the modified calcium sulfate whisker is as follows: 7g of calcium sulfate whisker and 0.75g of vinyl triethoxy silane are uniformly mixed to obtain the modified calcium sulfate whisker.

[0057] Preparation Example 3

[0058] The preparation method of the modified nano-sepiolite-1 is as follows: 12 g of nano-sepiolite, 2 g of benzoyl peroxide and 0.7 g of KH550 are uniformly mixed to obtain the modified nano-sepiolite-1.

[0059] Preparation Example 4

[0060] The preparation method of the modified nano-sepiolite-2 is as follows: 12 g of nano-sepiolite and 2 g of benzoyl peroxide are uniformly mixed to obtain the modified nano-sepiolite-2.

[0061] Example 1

[0062] A whisker-modified TPU cable material comprises, by weight, 80 parts of thermoplastic polyether-based polyurethane, 15 parts of ethylene-vinyl acetate copolymer, 12 parts of modified cellulose whiskers, 7 parts of modified calcium sulfate whiskers, and 4 parts of silicone.

[0063] The preparation method of whisker-modified TPU cable material comprises the following steps:

[0064] (1) 20 wt% of ethylene-vinyl acetate copolymer and thermoplastic polyether-based polyurethane are produced in an automatic metering two-stage device to prepare a pre-mixed masterbatch, wherein the extrusion temperature range is 135° C.;

[0065] (2) The premixed masterbatch and the remaining ethylene-vinyl acetate copolymer, modified cellulose whiskers, modified calcium sulfate whiskers, and silicone are put into an internal mixer for blending, and granulated by a screw machine after 20 minutes at a processing temperature range of 135° C. to obtain a whisker-modified TPU cable material.

[0066] Example 2

[0067] A whisker-modified TPU cable material comprises, by weight, 70 parts of thermoplastic polyether-based polyurethane, 10 parts of ethylene-vinyl acetate copolymer, 10 parts of modified cellulose whiskers, 5 parts of modified calcium sulfate whiskers and 3 parts of silicone.

[0068] The preparation method of whisker-modified TPU cable material comprises the following steps:

[0069] (1) 20 wt% of ethylene-vinyl acetate copolymer and thermoplastic polyether-based polyurethane in the formula are produced in an automatic metering two-stage device to obtain a pre-mixed masterbatch, wherein the extrusion temperature range is 125° C.;

[0070] (2) The premixed masterbatch and the remaining ethylene-vinyl acetate copolymer, modified cellulose whiskers, modified calcium sulfate whiskers, and silicone are put into an internal mixer for blending, and granulated by a screw machine after 10 minutes at a processing temperature range of 125° C. to obtain a whisker-modified TPU cable material.

[0071] Example 3

[0072] A whisker-modified TPU cable material comprises, by weight, 90 parts of thermoplastic polyether-based polyurethane, 20 parts of ethylene-vinyl acetate copolymer, 15 parts of modified cellulose whiskers, 10 parts of modified calcium sulfate whiskers and 5 parts of silicone.

[0073] The preparation method of whisker-modified TPU cable material comprises the following steps:

[0074] (1) 20 wt% of ethylene-vinyl acetate copolymer and thermoplastic polyether-based polyurethane in the formula are produced in an automatic metering two-stage device to prepare a pre-mixed masterbatch, wherein the extrusion temperature range is 155° C.;

[0075] (2) The premixed masterbatch and the remaining ethylene-vinyl acetate copolymer, modified cellulose whiskers, modified calcium sulfate whiskers, and silicone are put into an internal mixer for blending, and granulated by a screw machine after 30 minutes at a processing temperature range of 155° C. to obtain a whisker-modified TPU cable material.

[0076] Example 4

[0077] A whisker-modified TPU cable material comprises, by weight, 80 parts of thermoplastic polyether-based polyurethane, 15 parts of ethylene-vinyl acetate copolymer, 12 parts of modified cellulose whiskers, 7 parts of modified calcium sulfate whiskers, 4 parts of silicone, and 2 parts of modified nano-sepiolite-1.

[0078] The preparation method of whisker-modified TPU cable material comprises the following steps:

[0079] (1) 20 wt% of ethylene-vinyl acetate copolymer and thermoplastic polyether-based polyurethane in the formula are produced in an automatic metering two-stage device to obtain a pre-mixed masterbatch, wherein the extrusion temperature range is 135° C.;

[0080] (2) The premixed masterbatch and the remaining ethylene-vinyl acetate copolymer, modified cellulose whiskers, modified calcium sulfate whiskers, modified nano-sepiolite, and silicone are put into an internal mixer for blending. After 20 minutes, the mixture is granulated by a screw machine at a processing temperature of 135° C. to obtain a whisker-modified TPU cable material.

[0081] Example 5

[0082] A whisker-modified TPU cable material and a preparation method thereof. The specific implementation manner is the same as that of Example 4, except that the modified nano-sepiolite-1 is replaced by modified nano-sepiolite-2.

[0083] Comparative Example 1

[0084] A whisker-modified TPU cable material and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that the modified cellulose whiskers are replaced by cellulose whiskers.

[0085] Comparative Example 2

[0086] A whisker-modified TPU cable material and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that the modified calcium sulfate whisker is replaced by calcium sulfate whisker.

[0087] Performance Testing

[0088] The cable materials obtained in Examples 1-5 and Comparative Examples 1-2 were respectively subjected to the following performance tests, and the test results are shown in Table 1.

[0089] Wear resistance: TPU materials are tested for wear resistance in accordance with GB / T9867-2008 "Determination of wear resistance of vulcanized rubber or thermoplastic rubber (rotating roller abrasion machine method)";

[0090] Mechanical properties: The tensile strength of TPU material is tested according to GB / T528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber";

[0091] Flame retardant performance: The combustion performance of TPU materials is tested according to UL94 "Flame Retardant Grade Test Standards and Methods".

[0092] Table 1

[0093]

[0094] It can be seen from the data in Table 1 that the TPU cable material prepared in Examples 1-3 has excellent flexibility, wear resistance and flame retardancy. From the comparison between Example 4 and Example 1, it can be seen that after adding nano-sepiolite to the system, the volume wear of the TPU cable material is reduced, the wear resistance is further increased, and the elongation at break and the breaking strength are also further increased; from the comparison between Example 5 and Example 4, it can be seen that the use of unmodified nano-sepiolite makes the wear resistance, flexibility and flame retardancy of the TPU cable material worse, indicating that the unmodified nano-sepiolite is easy to agglomerate and reduces the wear resistance, flexibility and flame retardancy of the TPU; from the comparison between Comparative Example 1 and Example 1, it can be seen that only conventional unmodified cellulose whiskers are added, and the wear resistance, flexibility and flame retardancy of the TPU cable material are not good; from the comparison between Comparative Example 2 and Example 1, it can be seen that only conventional unmodified calcium sulfate whiskers are added, and the wear resistance, flexibility and flame retardancy of the TPU cable material are poor, which may be because the unmodified calcium sulfate whiskers are poorly dispersible and easy to agglomerate, and cannot play a good role.

[0095] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A whisker-modified TPU cable material, characterized in that: The invention comprises the following raw materials by weight: 70-90 parts of thermoplastic polyether-based polyurethane, 10-20 parts of ethylene-vinyl acetate copolymer, 10-15 parts of modified cellulose whisker, 5-10 parts of modified calcium sulfate whisker and 3-5 parts of lubricant.

2. A whisker-modified TPU cable material according to claim 1, characterized in that: The vinyl acetate content in the ethylene-vinyl acetate copolymer is 40-46 wt %.

3. A whisker-modified TPU cable material according to claim 1, characterized in that: The method for preparing the modified cellulose whiskers comprises the following steps: (1) placing the cellulose whiskers in a vacuum oven, heating the oven to 90-110° C. and dehydrating the whiskers for 6-12 hours to obtain dehydrated cellulose whiskers; (2) adding the dehydrated cellulose whiskers obtained in step (1) into DMF, stirring evenly, and then sonicating for 1-2 hours to obtain a cellulose whisker solution; (3) Add the cellulose solution obtained in step (2) into a reaction kettle, then add TDI, glycidyl acrylate and a catalyst, introduce nitrogen, heat to 75-85° C., react for 2-3 hours, take out the product, and dry it to obtain modified cellulose whiskers.

4. A whisker-modified TPU cable material according to claim 3, characterized in that: The weight ratio of the cellulose whisker, TDI and glycidyl acrylate is 10-15:2-3:1.5-2.

5.

5. A whisker-modified TPU cable material according to claim 1, characterized in that: The preparation method of the modified calcium sulfate whisker comprises the following steps: uniformly mixing the calcium sulfate whisker and vinyl triethoxysilane to obtain the modified calcium sulfate whisker.

6. A whisker-modified TPU cable material according to claim 5, characterized in that: The weight ratio of the calcium sulfate whisker to vinyl triethoxysilane is 5-10:0.5-1.

7. A whisker-modified TPU cable material according to claim 5 or 6, characterized in that: The calcium sulfate whiskers are anhydrous calcium sulfate whiskers.

8. A whisker-modified TPU cable material according to claim 1, characterized in that: The whisker-modified TPU cable material also contains 2-3 parts by weight of modified nano-sepiolite.

9. A whisker-modified TPU cable material according to claim 8, characterized in that: The preparation method of the modified nano-sepiolite is to uniformly mix the nano-sepiolite with KH550 and benzoyl peroxide to obtain the modified nano-sepiolite.

10. A method for preparing a whisker-modified TPU cable material according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) 15-25 wt% of ethylene-vinyl acetate copolymer and thermoplastic polyether-based polyurethane are produced in an automatic metering two-stage device to obtain a pre-mixed masterbatch, wherein the extrusion temperature range is 125-155° C.; (2) The premixed masterbatch and the remaining ethylene-vinyl acetate copolymer, modified cellulose whiskers, modified calcium sulfate whiskers, and lubricant are put into an internal mixer for blending, and granulated by a screw machine after 10-30 minutes at a processing temperature range of 125-155° C. to obtain a whisker-modified TPU cable material.

Images