Polypropylene insulating material for automobile Ethernet cable and preparation method of polypropylene insulating material

Abstract

The invention relates to the technical field of cable materials, and particularly discloses a polypropylene insulating material for an automobile Ethernet cable and a preparation method of the polypropylene insulating material. The polypropylene insulating material for the automobile Ethernet cable comprises the following components in parts by weight: 60-105 parts of polypropylene resin; 0 to 40 parts of SEBS resin; 0-15 parts of a compatilizer; 0.5 to 1.5 parts of a nucleating agent; and 0.3 to 1 part of an antioxidant. Researches show that the polypropylene insulating material for the automobile Ethernet cable has the advantages of good adhesive force, good mechanical property, high hardness and the like, also has the performance requirements of stable capacitance in water, small ovality, high and low temperature resistance and the like, and is excellent in comprehensive performance; therefore, the requirement of an automobile Ethernet communication cable can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable materials, in particular to a polypropylene insulation material for automotive Ethernet cable and a preparation method thereof. BACKGROUND

[0002] With the rapid development of information technology, the automotive industry is undergoing a profound transformation. Modern cars are no longer just simple means of transportation, but have evolved into mobile information centers, integrating a large number of electronic devices and systems, such as advanced driver assistance systems (ADAS), entertainment information systems, sensor networks, etc. The efficient operation of these systems depends on reliable data transmission networks, so a key challenge in using Ethernet in automotive environments is to choose the right cable material.

[0003] Currently, the insulation materials for communication lines on the market are mainly PE, XLPE, PVC or fluorine-containing materials. With the trend of environmental protection concept and industry development, PVC has poor dielectric properties, and fluorine-containing materials are high in cost, so they will be gradually replaced. The temperature resistance level of ordinary PE material cannot meet the 125℃ temperature resistance requirement in the ISO 19642 standard for automotive lines. XLPE needs to add crosslinking aids, and the residual components cause high dielectric loss of the material, and it needs to go through an irradiation process, which prolongs the production cycle and increases the production cost. Therefore, it is of important application value to develop a polypropylene insulation material for automotive Ethernet cable using polypropylene as raw material. SUMMARY

[0004] In order to overcome at least one of the technical problems existing in the prior art, the present application provides a polypropylene insulation material for automotive Ethernet cable and a preparation method thereof.

[0005] The technical solution of the present application is as follows:

[0006] The present application first provides a polypropylene insulation material for automotive Ethernet cable, which comprises the following components by weight:

[0007] Polypropylene resin 60-105 parts; SEBS resin 0-40 parts; compatibilizer 0-15 parts; nucleating agent 0.5-1.5 parts; antioxidant 0.3-1 part.

[0008] Preferably, the polypropylene insulation material for automotive Ethernet cable comprises the following components by weight:

[0009] Polypropylene resin 85-100 parts; SEBS resin 10-15 parts; compatibilizer 5-15 parts; nucleating agent 1-1.5 parts; antioxidant 0.5-1 part.

[0010] Preferably, the automobile Ethernet cable is insulated with polypropylene, and the polypropylene resin is a combination of homopolymer polypropylene resin and block copolymer polypropylene resin.

[0011] The inventors have found in their research that the polypropylene resin is a combination of homopolymer polypropylene resin and block copolymer polypropylene resin, which can avoid the bending whitening of single polypropylene.

[0012] Preferably, the weight ratio of the homopolymer polypropylene resin and the block copolymer polypropylene resin is 1-3:1.

[0013] Most preferably, the weight ratio of the homopolymer polypropylene resin and the block copolymer polypropylene resin is 2:1.

[0014] Preferably, the compatibilizer is at least one of maleic anhydride grafted polypropylene, maleic anhydride grafted ethylene-vinyl acetate copolymer, maleic anhydride grafted ethylene-octene copolymer, and maleic anhydride grafted ethylene butyl acrylate.

[0015] Further preferably, the compatibilizer is maleic anhydride grafted ethylene butyl acrylate. In the present application, the maleic anhydride grafted compatibilizer can improve the adhesion between the material and the metal conductor.

[0016] Preferably, the nucleating agent is at least one of calcium carbonate, calcium oxide, talc, silicon dioxide, boron nitride, sorbitol, and xylate.

[0017] Further preferably, the nucleating agent is a combination of sorbitol and boron nitride.

[0018] Further preferably, the weight ratio of sorbitol and boron nitride is 1:1-2.

[0019] Most preferably, the weight ratio of sorbitol and boron nitride is 1:1.5.

[0020] Preferably, the antioxidant is at least one of hindered phenolic antioxidants and phosphite antioxidants.

[0021] Preferably, the hindered phenolic antioxidant is at least one of antioxidants 245, 264, 300, 702, 703, 1010, 1024, B215, B225, B900, B911, DLTDP, and DSTDP.

[0022] Preferably, the phosphite antioxidant is at least one of antioxidants 168, 626, and P-EPQ.

[0023] Preferably, the antioxidant is a composite antioxidant, and the composite antioxidant is composed of antioxidant 300, antioxidant 168, and antioxidant 1024.

[0024] Preferably, the weight ratio of antioxidant 300, antioxidant 168 and antioxidant 1024 in the composite antioxidant is 2-4: 1-2: 1.

[0025] Most preferably, the weight ratio of antioxidant 300, antioxidant 168 and antioxidant 1024 in the composite antioxidant is 3: 1.5: 1.

[0026] In the present application, the antioxidant can prevent the decomposition of the components of the formula during the processing in the twin-screw extruder, inhibit the oxidation of the material by metal, improve the long-term aging resistance and prolong the service life of the product.

[0027] Preferably, the polypropylene resin is a modified polypropylene resin.

[0028] The modified polypropylene resin is prepared by the following method:

[0029] The homopolymer polypropylene resin and the block copolymer polypropylene resin are mixed, then the modifier is added, and the modified polypropylene resin is obtained after uniform mixing.

[0030] Preferably, the weight ratio of the homopolymer polypropylene resin and the block copolymer polypropylene resin is 1-3: 1.

[0031] Most preferably, the weight ratio of the homopolymer polypropylene resin and the block copolymer polypropylene resin is 2: 1.

[0032] Preferably, the weight ratio of the total weight of the homopolymer polypropylene resin and the block copolymer polypropylene resin to the weight of the modifier is 18-20: 1.

[0033] Most preferably, the weight ratio of the total weight of the homopolymer polypropylene resin and the block copolymer polypropylene resin to the weight of the modifier is 19: 1.

[0034] Preferably, the modifier is composed of octamethylcyclotetrasiloxane, propyltrimethylsiloxane and isopropyl tri(dioctyl pyrophosphoryloxy) titanate.

[0035] Preferably, the weight ratio of octamethylcyclotetrasiloxane, propyltrimethylsiloxane and isopropyl tri(dioctyl pyrophosphoryloxy) titanate is 1-3: 1-3: 2-4.

[0036] Most preferably, the weight ratio of octamethylcyclotetrasiloxane, propyltrimethylsiloxane and isopropyl tri(dioctyl pyrophosphoryloxy) titanate is 3: 2: 2.

[0037] The inventor has found in a large number of experiments that the modified polypropylene resin obtained by modifying the polypropylene resin by the above method can greatly improve the water capacitance stability of the polypropylene insulating material for automobile Ethernet cable and greatly reduce the ovality compared with the unmodified polypropylene resin.

[0038] Here, the inventor has found in research that the selection of the modifier of the application is very critical; only the modified polypropylene resin prepared by using the modifier composed of octamethylcyclotetrasiloxane, propyltrimethylsiloxane and isopropyl tri(dioctyl pyrophosphoric acyloxy) titanate can greatly improve the water capacitance stability of the polypropylene insulating material for automobile Ethernet cable and greatly reduce the ovality.

[0039] The application also provides a preparation method of the polypropylene insulating material for automobile Ethernet cable, characterized by comprising the following steps:

[0040] The polypropylene resin, SEBS resin, compatibilizer, nucleating agent and antioxidant are uniformly mixed and then melted and extruded in a double-screw extruder to obtain the polypropylene insulating material for automobile Ethernet cable.

[0041] Beneficial effects: The application provides a brand-new polypropylene insulating material for automobile Ethernet cable; research shows that the polypropylene insulating material for automobile Ethernet cable has good adhesion, good mechanical properties, high hardness and other advantages, and also has the properties of water capacitance stability, small ovality, high and low temperature resistance and excellent comprehensive performance; therefore, the requirements of automobile Ethernet communication cable can be met. DETAILED DESCRIPTION

[0042] The application will be further explained in combination with specific embodiments, but the embodiments do not limit the application in any form.

[0043] The homopolymer polypropylene resin and block copolymer polypropylene resin in the following embodiments are respectively polypropylene resins with model numbers 1040 and 3015 produced by Taizhong Plastics Co., Ltd.; the SEBS resin is an SEBS resin with model number 6153 produced by Taizhong Plastics Co., Ltd.; and the compatibilizer is a maleic anhydride grafted ethylene butyl acrylate with model number 3210 produced by Arkema. The raw materials not mentioned are commonly sold raw materials on the market.

[0044] Preparation of polypropylene insulating material for automobile Ethernet cable in Example 1

[0045] Raw material weight parts composition: polypropylene resin 85 parts; SEBS resin 15 parts; compatibilizer 15 parts; nucleating agent 1 part; antioxidant 0.8 part.

[0046] The polypropylene resin is a modified polypropylene resin; the modified polypropylene resin is prepared by mixing homopolymer polypropylene resin and block copolymer polypropylene resin, then adding a modifier, and mixing uniformly to obtain the modified polypropylene resin. The weight ratio of the homopolymer polypropylene resin and the block copolymer polypropylene resin is 2:1; the weight ratio of the total weight of the homopolymer polypropylene resin and the block copolymer polypropylene resin to the modifier is 19:1; the modifier is composed of octamethylcyclotetrasiloxane, propyltrimethylsiloxane and isopropyl tri(dioctyl pyrophosphoryloxy) titanate with a weight ratio of 3:2:2.

[0047] The nucleating agent is a composite nucleating agent composed of sorbitol and boron nitride with a weight ratio of 1:1.5; the antioxidant is a composite antioxidant composed of antioxidant 300, antioxidant 168 and antioxidant 1024 with a weight ratio of 3:1.5:1.

[0048] Preparation method: the above raw materials are mixed uniformly, then melted and extruded through a double screw extruder to obtain the polypropylene insulating material for automobile Ethernet cable.

[0049] Preparation of polypropylene insulating material for automobile Ethernet cable in Example 2

[0050] Raw material weight parts composition: polypropylene resin 95 parts; SEBS resin 10 parts; compatibilizer 10 parts; nucleating agent 1 part; antioxidant 0.8 part.

[0051] The polypropylene resin is a modified polypropylene resin; the modified polypropylene resin is prepared by mixing homopolymer polypropylene resin and block copolymer polypropylene resin, then adding a modifier, and mixing uniformly to obtain the modified polypropylene resin. The weight ratio of the homopolymer polypropylene resin and the block copolymer polypropylene resin is 2:1; the weight ratio of the total weight of the homopolymer polypropylene resin and the block copolymer polypropylene resin to the modifier is 19:1; the modifier is composed of octamethylcyclotetrasiloxane, propyltrimethylsiloxane and isopropyl tri(dioctyl pyrophosphoryloxy) titanate with a weight ratio of 3:2:2.

[0052] The nucleating agent is a composite nucleating agent composed of sorbitol and boron nitride with a weight ratio of 1:1.5; the antioxidant is a composite antioxidant composed of antioxidant 300, antioxidant 168 and antioxidant 1024 with a weight ratio of 3:1.5:1.

[0053] Preparation method: the above raw materials are mixed uniformly, then melted and extruded through a double screw extruder to obtain the polypropylene insulating material for automobile Ethernet cable.

[0054] Preparation of polypropylene insulating material for automobile Ethernet cable in Example 3

[0055] Raw material weight parts composition: polypropylene resin 100 parts; SEBS resin 10 parts; compatibilizer 5 parts; nucleating agent 1 part; antioxidant 0.8 parts.

[0056] The polypropylene resin is a modified polypropylene resin; the modified polypropylene resin is prepared by the following method: after mixing homopolymer polypropylene resin and block copolymer polypropylene resin, then adding modifier, mixing uniformly to obtain the modified polypropylene resin. Among them, the weight ratio of homopolymer polypropylene resin and block copolymer polypropylene resin is 2:1; the weight ratio of the total weight of homopolymer polypropylene resin and block copolymer polypropylene resin to modifier is 19:1; the modifier consists of octamethylcyclotetrasiloxane, propyltrimethylsiloxane and isopropyl tri(dioctyl pyrophosphoric acyloxy) titanate with a weight ratio of 3:2:2.

[0057] The nucleating agent is a composite nucleating agent composed of sorbitol and boron nitride with a weight ratio of 1:1.5; the antioxidant is a composite antioxidant composed of antioxidant 300, antioxidant 168 and antioxidant 1024 with a weight ratio of 3:1.5:1.

[0058] Preparation method: after mixing the above raw materials uniformly, melt extruding through a double screw extruder to obtain the polypropylene insulating material for automobile Ethernet cable.

[0059] Preparation of polypropylene insulating material for automobile Ethernet cable

[0060] Raw material weight parts composition: polypropylene resin 85 parts; SEBS resin 15 parts; compatibilizer 15 parts; nucleating agent 1.5 parts; antioxidant 0.8 parts.

[0061] The polypropylene resin is a modified polypropylene resin; the modified polypropylene resin is prepared by the following method: after mixing homopolymer polypropylene resin and block copolymer polypropylene resin, then adding modifier, mixing uniformly to obtain the modified polypropylene resin. Among them, the weight ratio of homopolymer polypropylene resin and block copolymer polypropylene resin is 2:1; the weight ratio of the total weight of homopolymer polypropylene resin and block copolymer polypropylene resin to modifier is 19:1; the modifier consists of octamethylcyclotetrasiloxane, propyltrimethylsiloxane and isopropyl tri(dioctyl pyrophosphoric acyloxy) titanate with a weight ratio of 3:2:2.

[0062] The nucleating agent is a composite nucleating agent composed of sorbitol and boron nitride with a weight ratio of 1:1.5; the antioxidant is a composite antioxidant composed of antioxidant 300, antioxidant 168 and antioxidant 1024 with a weight ratio of 3:1.5:1.

[0063] Preparation method: the raw materials are uniformly mixed and then melted and extruded through a double screw extruder to obtain the polypropylene insulating material for automobile Ethernet cable.

[0064] Example 5 Preparation of polypropylene insulating material for automobile Ethernet cable

[0065] Raw material weight parts composition: polypropylene resin 85 parts; SEBS resin 15 parts; compatibilizer 15 parts; nucleating agent 1 part; antioxidant 0.8 parts.

[0066] The polypropylene resin is composed of homopolymer polypropylene resin and block copolymer polypropylene resin in a weight ratio of 2:1; the nucleating agent is a composite nucleating agent composed of sorbitol and boron nitride in a weight ratio of 1:1.5; the antioxidant is a composite antioxidant composed of antioxidant 300, antioxidant 168 and antioxidant 1024 in a weight ratio of 3:1.5:1.

[0067] Preparation method: the raw materials are uniformly mixed and then melted and extruded through a double screw extruder to obtain the polypropylene insulating material for automobile Ethernet cable.

[0068] Preparation of polypropylene insulating material for automobile Ethernet cable in Comparative Example 1

[0069] Raw material weight parts composition: polypropylene resin 85 parts; SEBS resin 15 parts; compatibilizer 15 parts; nucleating agent 1 part; antioxidant 0.8 parts.

[0070] The polypropylene resin is a modified polypropylene resin; the modified polypropylene resin is prepared by the following method: after mixing homopolymer polypropylene resin and block copolymer polypropylene resin, adding a modifier, and uniformly mixing, the modified polypropylene resin is obtained. The weight ratio of homopolymer polypropylene resin and block copolymer polypropylene resin is 2:1; the weight ratio of the total weight of homopolymer polypropylene resin and block copolymer polypropylene resin to the modifier is 19:1; the modifier is composed of octamethylcyclotetrasiloxane and isopropyl tri(dioctyl pyrophosphoric acyloxy) titanate in a weight ratio of 3:2.

[0071] The nucleating agent is a composite nucleating agent composed of sorbitol and boron nitride in a weight ratio of 1:1.5; the antioxidant is a composite antioxidant composed of antioxidant 300, antioxidant 168 and antioxidant 1024 in a weight ratio of 3:1.5:1.

[0072] Preparation method: the raw materials are uniformly mixed and then melted and extruded through a double screw extruder to obtain the polypropylene insulating material for automobile Ethernet cable.

[0073] Preparation of polypropylene insulating material for automobile Ethernet cable in Comparative Example 2

[0074] The raw material weight parts composition: polypropylene resin 85 parts; SEBS resin 15 parts; compatibilizer 15 parts; nucleating agent 1 part; antioxidant 0.8 parts.

[0075] The polypropylene resin is a modified polypropylene resin; the modified polypropylene resin is prepared by mixing homopolymer polypropylene resin and block copolymer polypropylene resin, then adding a modifier, and mixing uniformly to obtain the modified polypropylene resin. The weight ratio of the homopolymer polypropylene resin and the block copolymer polypropylene resin is 2:1; the weight ratio of the total weight of the homopolymer polypropylene resin and the block copolymer polypropylene resin to the modifier is 19:1; the modifier is composed of propyl trimethyl siloxane and isopropyl tri(dioctyl pyrophosphoric acyloxy) titanate with a weight ratio of 1:1.

[0076] The nucleating agent is a composite nucleating agent composed of sorbitol and boron nitride with a weight ratio of 1:1.5; the antioxidant is a composite antioxidant composed of antioxidant 300, antioxidant 168, and antioxidant 1024 with a weight ratio of 3:1.5:1.

[0077] Preparation method: after the above raw materials are uniformly mixed, melt extrusion is carried out through a double screw extruder to obtain the polypropylene insulating material for automobile Ethernet cable.

[0078] The solid polypropylene insulating material prepared in Examples 1-5 and Comparative Examples 1-2 is subjected to performance testing.

[0079] Table 1 Test results of polypropylene insulating material for automobile Ethernet cable

[0080]

[0081]

[0082] The tensile strength and elongation at break in Table 1 are test results of wires with the same specifications; the low temperature winding at -40℃, the long-term heat aging at 125℃ / 3000h, and the short-term heat aging at 150℃ / 240h are tested according to the requirements of ISO 19642 standard. The water capacitance difference is the difference in water capacitance of the insulating cable measured by the present inventors at extrusion speeds of 50 m / min and 300 m / min.

[0083] The test standards of hardness, tensile strength and elongation at break, and dielectric constant are GB / T 2411-2008, GB / T 1040.3-2006, and GB / T 1409-2006, respectively. The water capacitance and ovality are automatically detected data of the wire diameter instrument during the cable extrusion process.

[0084] The adhesion is tested by the finished product cable test by pressing, and the test method is as follows: 100 mm finished product cable is taken, 50 mm insulation layer is removed, the conductor with 50 mm insulation layer removed is passed through a small hole, and the universal testing machine is used to test the size of the 50 mm insulation layer peeling force, and the result is the adhesion.

[0085] It can be known from the test results in Table 1 that the polypropylene insulation material for the automobile Ethernet cable prepared in the embodiment has good tensile strength and elongation at break, and also has the performance requirements of water capacitance stability, small ovality, high and low temperature resistance and the like, and has excellent comprehensive performance. Therefore, the requirements of the automobile Ethernet communication cable can be met.

[0086] It can also be known from the experimental data in Table 1 that the water capacitance difference of the polypropylene insulation material for the automobile Ethernet cable prepared in Example 1 is much smaller than that of the polypropylene insulation material for the automobile Ethernet cable prepared in Example 5. This shows that the modified polypropylene resin obtained by modifying the polypropylene resin by the method of the present application can greatly improve the water capacitance stability of the polypropylene insulation material for the automobile Ethernet cable compared with the unmodified polypropylene resin.

[0087] It can also be known from the experimental data in Table 1 that the water capacitance difference of the polypropylene insulation material for the automobile Ethernet cable prepared in Comparative Examples 1 and 2 is compared with that of the polypropylene insulation material for the automobile Ethernet cable prepared in Example 5; although it is reduced, the reduction is not large, and it still has a relatively high water capacitance difference, and the reduction is much smaller than that of Example 1. This shows that the selection of the modifier of the present application is very critical; only the modified polypropylene resin prepared by using the modifier composed of octamethylcyclotetrasiloxane, propyltrimethylsiloxane and isopropyl tri(dioctyl pyrophosphoric acyloxy) titanate can greatly improve the water capacitance stability of the polypropylene insulation material for the automobile Ethernet cable.

[0088] It can also be known from the experimental data in Table 1 that the ovality of the polypropylene insulation material for the automobile Ethernet cable prepared in Example 1 is much smaller than that of the polypropylene insulation material for the automobile Ethernet cable prepared in Example 5. This shows that the modified polypropylene resin obtained by modifying the polypropylene resin by the method of the present application can greatly reduce the ovality of the polypropylene insulation material for the automobile Ethernet cable compared with the unmodified polypropylene resin.

[0089] It can also be seen from the experimental data in Table 1 that the ovality of the polypropylene insulating material for automobile Ethernet cable prepared in Comparative Examples 1 and 2 is lower than that of the polypropylene insulating material for automobile Ethernet cable prepared in Example 5, but the decrease is not great, and the ovality is still high, and the decrease is much smaller than that in Example 1. This shows that the selection of the modifier is very critical; only the modified polypropylene resin prepared by using the modifier composed of octamethylcyclotetrasiloxane, propyltrimethylsiloxane and isopropyl tri(dioctyl pyrophosphato) titanate can greatly reduce the ovality of the polypropylene insulating material for automobile Ethernet cable.

Claims

1. A polypropylene insulation material for automotive Ethernet cables, characterized in that, It contains the following components in parts by weight: 60-105 parts polypropylene resin; 0-40 parts SEBS resin; 0-15 parts compatibilizer; 0.5-1.5 parts nucleating agent; 0.3-1 part antioxidant.

2. The polypropylene insulation material for automotive Ethernet cables according to claim 1, characterized in that, It contains the following components in parts by weight: 85-100 parts polypropylene resin; 10-15 parts SEBS resin; 5-15 parts compatibilizer; 1-1.5 parts nucleating agent; 0.5-1 part antioxidant.

3. The polypropylene insulation material for automotive Ethernet cables according to claim 1, characterized in that, The polypropylene resin used is a combination of homopolymer polypropylene resin and block copolymer polypropylene resin.

4. The polypropylene insulation material for automotive Ethernet cables according to claim 3, characterized in that, The weight ratio of homopolymer polypropylene resin to block copolymer polypropylene resin is 1 to 3:

1.

5. The polypropylene insulation material for automotive Ethernet cables according to claim 1, characterized in that, The compatibilizer is selected from at least one of maleic anhydride-grafted polypropylene, maleic anhydride-grafted ethylene-vinyl acetate copolymer, maleic anhydride-grafted ethylene-octene copolymer, and maleic anhydride-grafted ethylene butyl acrylate.

6. The polypropylene insulation material for automotive Ethernet cables according to claim 1, characterized in that, The nucleating agent is selected from at least one of calcium carbonate, calcium oxide, talc, silicon dioxide, boron nitride, sorbitol, and lignin.

7. The polypropylene insulation material for automotive Ethernet cables according to claim 1, characterized in that, The antioxidant is selected from at least one of hindered phenolic antioxidants and phosphite antioxidants.

8. The polypropylene insulation material for automotive Ethernet cables according to claim 1, characterized in that, The polypropylene resin mentioned is a modified polypropylene resin; The modified polypropylene resin was prepared by the following method: After mixing homopolymer polypropylene resin and block copolymer polypropylene resin, a modifier is added and mixed evenly to obtain the modified polypropylene resin.

9. The polypropylene insulation material for automotive Ethernet cables according to claim 8, wherein the total weight ratio of homopolymer polypropylene resin and block copolymer polypropylene resin to the modifier is 18-20:1; Most preferably, the total weight ratio of homopolymer polypropylene resin and block copolymer polypropylene resin to modifier is 19:

1.

10. A method for preparing the polypropylene insulating material for automotive Ethernet cables according to any one of claims 1 to 9, characterized in that, It includes the following steps: The polypropylene insulation material for automotive Ethernet cables is obtained by uniformly mixing polypropylene resin, SEBS resin, compatibilizer, nucleating agent and antioxidant, and then melt-extruding it in a twin-screw extruder.

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