Preparation method for and use of modified polypropylene insulating cable material
By utilizing a modified polypropylene cable material preparation method, hydroxyl condensation and dehydration reactions, combined with aliphatic amine activation, alkyl-terminated elastomers were prepared and mixed with polypropylene. This solved the problems of brittle cracking and insufficient insulation performance of polypropylene cable materials, and improved the toughness and insulation performance of the materials.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- STATE GRID LIAONING ELECTRIC POWER CO LTD
- Filing Date
- 2025-12-01
- Publication Date
- 2026-07-30
AI Technical Summary
Polypropylene cable materials are prone to brittle cracking during manufacturing, transportation, and laying, and their insulation performance needs further improvement.
By condensing an elastomer with hydroxyl side chains with a silane coupling agent to form a modified intermediate material, followed by dehydration condensation with 4,4'-stilbene dicarboxylic acid, and finally reacting with aliphatic amines, an alkyl-terminated elastomer is prepared. This elastomer is then mixed with homopolymer/copolymer polypropylene to improve the toughness and insulation properties of the material.
It significantly improves the toughness and insulation properties of polypropylene cable materials, and enhances their mechanical properties and electrical stability.
Smart Images
Figure PCTCN2025138924-APPB-I100001
Abstract
Description
Preparation method and application of modified polypropylene insulated cable material Technical Field
[0001] This application relates to the field of cable material technology, such as a method for preparing and applying a modified polypropylene insulated cable material. Background Technology
[0002] Cables have a wide range of applications, including power, communications, construction, industry, and transportation. Among these, the power industry has the largest demand for cables.
[0003] Currently, most cable insulation materials are made of cross-linked polyethylene (XLPE). Compared with XLPE, polypropylene has advantages such as excellent insulation performance, high temperature resistance, and recyclability. Moreover, the extrusion process does not require cross-linking, which can effectively reduce energy consumption. It is considered one of the most promising alternatives to XLPE insulation materials. However, cables made of polypropylene currently have the disadvantages of high material rigidity and poor toughness. They are prone to brittle cracking during cable manufacturing, transportation, and laying. Furthermore, the insulation performance of cables made of polypropylene needs to be further improved.
[0004] Therefore, a method for improving the toughness and insulation properties of polypropylene materials used in cable manufacturing is urgently needed. Summary of the Invention
[0005] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.
[0006] This application provides a method for preparing modified polypropylene insulated cable material and its application. The preparation method can effectively improve the toughness and insulation performance of polypropylene insulated cable material.
[0007] The first aspect of this application provides a method for preparing a modified polypropylene insulated cable material, comprising:
[0008] An elastomer with hydroxyl groups on its side chain is added to a silane coupling agent and stirred until the hydroxyl groups in the elastomer with hydroxyl groups on its side chain complete the condensation reaction, thereby obtaining a modified first intermediate material.
[0009] 4,4'-stilbene dicarboxylic acid is dispersed in a first solvent, and then a first catalyst is added to activate the carboxyl group in 4,4'-stilbene dicarboxylic acid to obtain a second intermediate material with carboxyl group activation.
[0010] The first intermediate material is added to the second intermediate material, and the first and second intermediate materials are allowed to react fully under stirring conditions to obtain a modified elastomer.
[0011] The modified elastomer was dispersed in a second solvent, and a second catalyst was added to activate the carboxyl groups in the modified elastomer. After the modified elastomer was activated, an aliphatic amine was added to obtain an alkyl-terminated elastomer.
[0012] Alkyl-terminated elastomers are mixed and melted with homopolymer / copolymer polypropylene to obtain modified homopolymer / copolymer polypropylene insulated cable materials.
[0013] Optionally, in the process of mixing and melting alkyl-terminated elastomer with homopolymer / copolymer polypropylene to obtain modified homopolymer / copolymer polypropylene insulated cable material, the mass ratio between alkyl-terminated elastomer and homopolymer / copolymer polypropylene is 0.2-5:100, and the melting reaction temperature is 180-220℃.
[0014] Optionally, the silane coupling agent includes at least one of silane coupling agents containing amino and methoxy / ethoxy groups.
[0015] Optionally, the silane coupling agent containing amino and methoxy / ethoxy groups is at least one of silane coupling agent KH550 and silane coupling agent KH792.
[0016] Alternatively, the elastomer with hydroxyl groups on the side chain includes at least one of polyurethane elastomer and hydroxyl-terminated polycaprolactone.
[0017] Optionally, the first catalyst is at least one of HATU, HBTU, and HCTU; the first solvent is dimethyl sulfoxide; the second catalyst is at least one of HATU, HBTU, and HCTU, and the second solvent is dimethyl sulfoxide.
[0018] Optionally, the fatty amine is n-octylamine.
[0019] Optionally, after adding the elastomer with hydroxyl side chains to the silane coupling agent and stirring until the hydroxyl groups in the elastomer with hydroxyl side chains complete the condensation reaction to obtain the modified first intermediate material, the process further includes:
[0020] After separating the modified first intermediate material, it is dried at 50-70℃ to obtain the dried first intermediate material.
[0021] Accordingly, after adding the first intermediate material to the second intermediate material, and allowing the first and second intermediate materials to react fully under stirring conditions to obtain the modified elastomer, the process further includes:
[0022] After separating the modified elastomer, it is dried at 50-70℃ to obtain the dried modified elastomer.
[0023] Optionally, after adding the first intermediate material to the second intermediate material, the mixture is stirred at 25-80°C for 14-24 hours to ensure complete reaction between the first and second intermediate materials; and / or
[0024] After the modified elastomer is activated, a fatty amine is added, and the mixture is stirred at 25-80℃ for 14-24 hours to allow the modified elastomer and the fatty amine to react fully, thus obtaining an alkyl-terminated elastomer.
[0025] The second aspect of this application provides the application of a modified polypropylene insulated cable material in insulated cable materials, the insulated cable material comprising the modified polypropylene insulated cable material prepared by the method described above.
[0026] This application provides a method for preparing a modified polypropylene insulated cable material. First, an elastomer with hydroxyl side chains undergoes a condensation reaction with a silane coupling agent to dehydrate the hydroxyl groups in the elastomer, allowing it to condense with the silane coupling agent to obtain a first intermediate material containing amino groups. Next, this first intermediate material undergoes a dehydration condensation reaction with 4,4'-stilbene dicarboxylic acid in a second intermediate material to form peptide bonds, resulting in a modified elastomer containing a certain amount of carboxyl groups in the second intermediate material. Then, this modified elastomer undergoes a dehydration condensation reaction with a fatty amine to obtain an alkyl-terminated elastomer containing elastomer segments and voltage stabilizer segments. Finally, the alkyl-terminated elastomer is mixed and melted with homopolymer / copolymer polypropylene to improve the toughness and insulation performance of the final polypropylene cable.
[0027] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained from the written description.
[0028] The technical solution of this application will be further described in detail below through embodiments.
[0029] After reading and understanding the detailed description, other aspects can be understood. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0031] This application provides a method for preparing a modified polypropylene insulated cable material, comprising the following steps:
[0032] Step 1: Add the elastomer with hydroxyl side chains to the silane coupling agent and stir until the hydroxyl groups in the elastomer with hydroxyl side chains complete the condensation reaction to obtain the modified first intermediate material.
[0033] Step 2: Disperse 4,4'-stilbene dicarboxylic acid in the first solvent, and then add the first catalyst to activate the carboxyl group in 4,4'-stilbene dicarboxylic acid to obtain the second intermediate material with carboxyl group activation;
[0034] Step 3: Add the first intermediate material to the second intermediate material, and allow the first and second intermediate materials to react fully under stirring conditions to obtain the modified elastomer;
[0035] Step 4: Disperse the modified elastomer in the second solvent, add the second catalyst to activate the carboxyl groups in the modified elastomer, and add aliphatic amine after the modified elastomer is activated to obtain an alkyl-terminated elastomer;
[0036] Step 5: Mix and melt the alkyl-terminated elastomer with homopolymer / copolymer polypropylene to obtain modified homopolymer / copolymer polypropylene insulated cable material.
[0037] It should be noted that in step 1, an elastomer with hydroxyl groups on its side chains is selected and subjected to a condensation reaction with a silane coupling agent to dehydrate the hydroxyl groups in the elastomer, thus completing the condensation of the elastomer with hydroxyl groups and the silane coupling agent. This results in the first intermediate material obtained in step 1 being a modified intermediate material with amino groups. In step 2, the carboxyl groups in 4,4'-stilbene dicarboxylic acid are activated to activate the carboxyl groups in the obtained second intermediate material. This allows step 3 to proceed by reacting the carboxyl-activated second intermediate material with the modified first intermediate material with amino groups obtained in step 1, causing the first intermediate material to undergo dehydration condensation with 4,4'-stilbene dicarboxylic acid to form peptide bonds, thereby obtaining a modified elastomer with 4,4'-stilbene dicarboxylic acid. Since the modified elastomer with 4,4'-stilbene dicarboxylic acid obtained in step 3 still contains certain carboxyl groups, therefore... In step 4, the alkyl-terminated elastomer is obtained by dehydrating and condensing the carboxyl group with aliphatic amine. Since the alkyl-terminated elastomer has good compatibility with both voltage stabilizers and homopolymer / copolymer polypropylene, it can be uniformly incorporated into the homopolymer / copolymer polypropylene. The elastomer segments contained in the alkyl-terminated elastomer effectively improve the toughness of the homopolymer / copolymer polypropylene containing it, thereby improving the mechanical properties of the polypropylene cable material containing the alkyl-terminated elastomer-modified homopolymer / copolymer polypropylene. Simultaneously, the voltage stabilizer segments contained in the alkyl-terminated elastomer prevent the migration of small-molecule voltage stabilizers from the homopolymer / copolymer polypropylene, thus enhancing the insulation performance of the polypropylene cable material containing the alkyl-terminated elastomer-modified homopolymer / copolymer polypropylene.
[0038] The method for preparing modified polypropylene insulated cable material provided in this application first involves a condensation reaction between an elastomer with hydroxyl side chains and a silane coupling agent to dehydrate the hydroxyl groups in the elastomer. This condensation then allows the elastomer to obtain a first intermediate material containing amino groups. Next, this first intermediate material undergoes a dehydration condensation reaction with 4,4'-stilbene dicarboxylic acid in a second intermediate material to form peptide bonds. This results in a certain amount of carboxyl groups remaining in the second intermediate material, which is activated by the carboxyl groups in the obtained modified elastomer. The modified elastomer is then dehydrated and condensed with a fatty amine to obtain an alkyl-terminated elastomer containing elastomer segments and voltage stabilizer segments. Finally, the alkyl-terminated elastomer is mixed and melted with homopolymer / copolymer polypropylene to improve the toughness and insulation properties of the final polypropylene cable material.
[0039] In some possible embodiments, in the process of melting and mixing the alkyl-terminated elastomer with homopolymer / copolymer polypropylene to obtain the modified homopolymer / copolymer polypropylene insulated cable material, the mass ratio between the alkyl-terminated elastomer and the homopolymer / copolymer polypropylene is 0.2-5:100, and the melting reaction temperature is 180-220°C.
[0040] Here, the mass ratio between the alkyl-terminated elastomer and the homopolymer / copolymer polypropylene can be, but is not limited to, any one of 0.2:100, 0.5:100, 1:100, 2:100, 3:100, 4:100, and 5:100; the melting reaction temperature can be any one of 180℃, 190℃, 200℃, 210℃, and 220℃.
[0041] In this embodiment, by selecting a mass ratio of alkyl-terminated elastomer to homopolymer / copolymer polypropylene of 0.2-5:100, and by completing the melt reaction of the alkyl-terminated elastomer and homopolymer / copolymer polypropylene at a temperature of 180-220°C, the alkyl-terminated elastomer can be uniformly incorporated into the homopolymer / copolymer polypropylene, thereby improving the modification efficiency of the alkyl-terminated elastomer on the homopolymer / copolymer polypropylene.
[0042] In some possible embodiments, the silane coupling agent includes at least one of silane coupling agents containing amino and methoxy / ethoxy groups.
[0043] It should be noted that selecting silane coupling agents with amino and methoxy / ethoxy groups enables the silane coupling agent to contain two different active groups, namely amino and methoxy / ethoxy, thereby enabling the silane coupling agent to couple organic polymers and inorganic fillers, enhancing their adhesion.
[0044] In this embodiment, by selecting a silane coupling agent containing amino and methoxy / ethoxy groups, the mechanical, electrical, water resistance, and anti-aging properties of the obtained first intermediate material can be improved based on the amino and methoxy / ethoxy groups contained in the silane coupling agent, so that the material properties of the first intermediate material are more suitable for application in cable materials.
[0045] In some possible embodiments, the silane coupling agent containing amino and methoxy / ethoxy groups is at least one of silane coupling agent KH550 and silane coupling agent KH792.
[0046] Here, both silane coupling agents KH550 and KH792 contain two different active groups, namely amino and oxygen groups. Therefore, both silane coupling agents KH550 and KH792 can be used to couple organic polymers and inorganic fillers, enhance their adhesion, and improve the mechanical, electrical, water resistance, and anti-aging properties of the obtained first intermediate material.
[0047] In some possible embodiments, the elastomer with hydroxyl side chains includes at least one of polyurethane elastomers and hydroxyl-terminated polycaprolactone.
[0048] Here, polyurethane elastomers with hydroxyl groups on their side chains are selected, which enables the first intermediate material obtained in step 1 to have high strength, tear resistance, and wear resistance. Hydroxyl-terminated polycaprolactone is selected as the elastomer with hydroxyl groups on its side chains, which enables the first intermediate material obtained in step 1 to have high strength, stiffness, wear resistance, and insulation.
[0049] In some possible embodiments, the first catalyst is at least one of HATU, HBTU, and HCTU; the first solvent is dimethyl sulfoxide; the second catalyst is at least one of HATU, HBTU, and HCTU, and the second solvent is dimethyl sulfoxide.
[0050] In some possible embodiments, the fatty amine is n-octylamine.
[0051] Here, the fatty amine is selected as n-octylamine, which enables the modified elastomer to react with n-octylamine to obtain an alkyl-terminated elastomer.
[0052] In some possible embodiments, after adding the elastomer with hydroxyl side chains to the silane coupling agent and stirring until the hydroxyl groups in the elastomer with hydroxyl side chains complete the condensation reaction to obtain the modified first intermediate material, the method further includes: separating the modified first intermediate material and drying it at 50-70°C to obtain the dried first intermediate material.
[0053] Here, by separating the modified first intermediate material and drying it at 50-70°C, the liquid in the first intermediate material can be removed, so that the reaction in step 3 can be carried out without silane coupling agent.
[0054] It should be noted that the drying temperature of the first intermediate material can be any one of 50℃, 55℃, 60℃, 65℃, and 70℃.
[0055] Accordingly, after adding the first intermediate material to the second intermediate material and allowing the first and second intermediate materials to react fully under stirring conditions to obtain the modified elastomer, the process further includes: separating the modified elastomer and drying it at 50-70°C to obtain the dried modified elastomer.
[0056] Here, the liquid in the modified elastomer can be removed by separating it and drying it at 50-70°C.
[0057] It should be noted that the drying temperature of the modified elastomer can be any one of 50℃, 55℃, 60℃, 65℃, or 70℃.
[0058] In some possible embodiments, after adding the first intermediate material to the second intermediate material, the mixture is stirred at a temperature of 25-80°C for 14-24 hours to allow the first and second intermediate materials to react fully.
[0059] Here, the reaction temperature of the first intermediate material and the second intermediate material can be any one of 25℃, 30℃, 35℃, 40℃, 45℃, 50℃, 55℃, 60℃, 65℃, 70℃, 75℃ and 80℃; the stirring time of the first intermediate material and the second intermediate material can be any one of 14h, 15h, 16h, 17h, 18h, 19h, 20h, 21h, 22h, 23h and 24h.
[0060] In this embodiment, by setting the reaction temperature of the first intermediate material and the second intermediate material to 25-80°C and the stirring time to 14-24h, the first intermediate material and the second intermediate material can react fully, thereby improving the preparation efficiency of the modified elastomer.
[0061] In some possible embodiments, after the modified elastomer is activated, a fatty amine is added, and the mixture is stirred at 25-80°C for 14-24 hours to allow the modified elastomer and the fatty amine to react fully and obtain an alkyl-terminated elastomer.
[0062] Here, the reaction temperature of the activated modified elastomer and fatty amine can be any one of, but not limited to, 25℃, 30℃, 35℃, 40℃, 45℃, 50℃, 55℃, 60℃, 65℃, 70℃, 75℃ and 80℃; the stirring time of the activated modified elastomer and fatty amine can be any one of, but not limited to, 14h, 15h, 16h, 17h, 18h, 19h, 20h, 21h, 22h, 23h and 24h.
[0063] In this embodiment, by setting the reaction temperature of the activated modified elastomer and the fatty amine to 25-80°C and the stirring time to 14-24h, the modified elastomer and the fatty amine can be fully reacted, thereby improving the preparation efficiency of the alkyl-terminated elastomer.
[0064] This application provides the application of a modified polypropylene insulated cable material in insulated cable materials, the insulated cable material including the modified polypropylene insulated cable material prepared by the method described above.
[0065] Since the above methods can effectively improve the toughness and insulation performance of polypropylene insulated cable materials, the modified polypropylene insulated cable materials prepared by the above methods can be used in insulated cable materials to effectively improve the toughness and insulation performance of insulated cable materials.
[0066] The following examples illustrate a specific method for preparing a modified polypropylene insulated cable material provided in this application. It should be noted that, unless otherwise specified, the methods, reagents, and materials described in the following examples are all commercially available; and the experimental methods described are conventional methods unless otherwise specified.
[0067] Example 1
[0068] This embodiment provides a method for preparing a modified polypropylene insulated cable material, comprising the following steps:
[0069] Step 1: Add 10g of polyurethane elastomer with hydroxyl side chains to 300mL of silane coupling agent KH550 and stir for 12h until the hydroxyl groups in the polyurethane elastomer with hydroxyl side chains complete the condensation reaction to obtain the modified first intermediate material.
[0070] Step 2: After separating the modified first intermediate material, dry it at 60°C to obtain the dried first intermediate material;
[0071] Step 3: Disperse 10g of 4,4'-stilbene dicarboxylic acid into 500mL of dimethyl sulfoxide, add HATU to activate the carboxyl group in 4,4'-stilbene dicarboxylic acid, and obtain the second intermediate material with carboxyl group activation;
[0072] Step 4: Add 10g of the first intermediate material to the second intermediate material obtained in Step 3, and stir at 70°C for 16 hours to allow the first and second intermediate materials to react fully and obtain the modified elastomer.
[0073] Step 5: After separating the modified elastomer, wash it twice with deionized water and ethanol respectively, and dry it at 60°C to obtain the dried modified elastomer.
[0074] Step 6: Take 10g of modified elastomer and disperse it in 500mL of dimethyl sulfoxide. Then add HATU to activate the carboxyl groups in the modified elastomer. After the modified elastomer is activated, add 20g of n-octylamine. Stir at 60℃ for 20h to allow the first intermediate material and the second intermediate material to react fully to obtain an alkyl-terminated elastomer.
[0075] Step 7: Mix the alkyl-terminated elastomer with homopolymer / copolymer polypropylene at a mass ratio of 3:100 and complete the melt treatment at 210°C to obtain the modified homopolymer / copolymer polypropylene insulated cable material.
[0076] Example 2
[0077] This embodiment provides a method for preparing a modified polypropylene insulated cable material, comprising the following steps:
[0078] Step 1: Add 10g of polyurethane elastomer with hydroxyl side chains to 300mL of silane coupling agent KH792 and stir for 12h until the hydroxyl groups in the polyurethane elastomer with hydroxyl side chains complete the condensation reaction to obtain the modified first intermediate material.
[0079] Step 2: After separating the modified first intermediate material, dry it at 50°C to obtain the dried first intermediate material;
[0080] Step 3: Disperse 10g of 4,4'-stilbene dicarboxylic acid into 500mL of dimethyl sulfoxide, and then add HATU to activate the carboxyl group in 4,4'-stilbene dicarboxylic acid to obtain the second intermediate material with carboxyl group activation;
[0081] Step 4: Add 10g of the first intermediate material to the second intermediate material obtained in Step 3, and stir at 25°C for 16 hours to allow the first and second intermediate materials to react fully and obtain the modified elastomer.
[0082] Step 5: After separating the modified elastomer, wash it twice with deionized water and ethanol respectively, and dry it in an oven at 65°C to obtain the dried modified elastomer.
[0083] Step 6: Take 10g of modified elastomer and disperse it in 500mL of dimethyl sulfoxide. Then add HATU to activate the carboxyl groups in the modified elastomer. After the modified elastomer is activated, add 20g of n-octylamine. Stir at 80℃ for 20h to allow the first intermediate material and the second intermediate material to react fully to obtain an alkyl-terminated elastomer.
[0084] Step 7: Mix the alkyl-terminated elastomer with homopolymer / copolymer polypropylene at a mass ratio of 3:100 and complete the melt treatment at 210°C to obtain the modified homopolymer / copolymer polypropylene insulated cable material.
[0085] Example 3
[0086] This embodiment provides a method for preparing a modified polypropylene insulated cable material, comprising the following steps:
[0087] Step 1: Add 10g of polyurethane elastomer with hydroxyl side chains to 300mL of silane coupling agent KH792 and stir for 14h until the hydroxyl groups in the polyurethane elastomer with hydroxyl side chains complete the condensation reaction to obtain the modified first intermediate material.
[0088] Step 2: After separating the modified first intermediate material, dry it at 70°C to obtain the dried first intermediate material;
[0089] Step 3: Disperse 12g of 4,4'-stilbene dicarboxylic acid into 500mL of dimethyl sulfoxide, and then add HCTU to activate the carboxyl group in 4,4'-stilbene dicarboxylic acid to obtain the second intermediate material with carboxyl group activation;
[0090] Step 4: Add 10g of the first intermediate material to the second intermediate material, and stir at 80℃ for 16h to allow the first and second intermediate materials to react fully and obtain the modified elastomer;
[0091] Step 5: After separating the modified elastomer, wash it twice with deionized water and ethanol respectively, and dry it in an oven at 70°C to obtain the dried modified elastomer.
[0092] Step 6: Take 10g of modified elastomer and disperse it in 500mL of dimethyl sulfoxide. Then add HACU to activate the carboxyl groups in the modified elastomer. After the modified elastomer is activated, add 18g of n-octylamine. Stir at 25°C for 20h to allow the first intermediate material and the second intermediate material to react fully to obtain an alkyl-terminated elastomer.
[0093] Step 7: Mix the alkyl-terminated elastomer with homopolymer / copolymer polypropylene at a mass ratio of 0.5:100 and complete the melt treatment at 190°C to obtain the modified homopolymer / copolymer polypropylene insulated cable material.
[0094] Example 4
[0095] This embodiment provides a method for preparing a modified polypropylene insulated cable material, comprising the following steps:
[0096] Step 1: Add 10g of hydroxyl-terminated polycaprolactone to 300mL of silane coupling agent KH792 and stir for 14h until the hydroxyl groups in the polyurethane elastomer with hydroxyl side chains complete the condensation reaction to obtain the modified first intermediate material.
[0097] Step 2: After separating the modified first intermediate material, dry it at 65°C to obtain the dried first intermediate material;
[0098] Step 3: Disperse 12g of 4,4'-stilbene dicarboxylic acid into 500mL of dimethyl sulfoxide, and then add HCTU to activate the carboxyl group in 4,4'-stilbene dicarboxylic acid to obtain the second intermediate material with carboxyl group activation;
[0099] Step 4: Add 10g of the first intermediate material to the second intermediate material, and stir at 60℃ for 16h to allow the first and second intermediate materials to react fully and obtain the modified elastomer;
[0100] Step 5: After separating the modified elastomer, wash it twice with deionized water and ethanol respectively, and dry it in an oven at 50°C to obtain the dried modified elastomer.
[0101] Step 6: Take 10g of modified elastomer and disperse it in 500mL of dimethyl sulfoxide. Then add HACU to activate the carboxyl groups in the modified elastomer. After the modified elastomer is activated, add 18g of n-octylamine. Stir at 60℃ for 20h to allow the first intermediate material and the second intermediate material to react fully to obtain the alkyl-terminated elastomer.
[0102] Step 7: Mix the alkyl-terminated elastomer with homopolymer / copolymer polypropylene at a mass ratio of 2:100, and complete the melt treatment at 180°C to obtain the modified homopolymer / copolymer polypropylene insulated cable material.
[0103] Comparative Example 1
[0104] The comparative example provides a method for preparing a polypropylene insulated cable material, comprising the following steps: mixing a polyurethane elastomer with hydroxyl side chains with homopolymer / copolymer polypropylene at a mass ratio of 3:100, and then performing melt treatment at 210°C in an internal mixer to obtain a homopolymer / copolymer polypropylene insulated cable material.
[0105] Comparative Example 2
[0106] The comparative example provides a method for preparing a polypropylene insulated cable material, comprising the following steps: mixing a polyurethane elastomer with hydroxyl side chains, 4,4'-stilbene dicarboxylic acid, and homopolymer / copolymer polypropylene in a mass ratio of 1.5:1.5:100, and then performing melt treatment in an internal mixer at 210°C to obtain the homopolymer / copolymer polypropylene insulated cable material.
[0107] Comparative Example 3
[0108] The comparative example provides a method for preparing a polypropylene insulated cable material, comprising the following steps: mixing 4,4'-stilbene dicarboxylic acid and homopolymer / copolymer polypropylene at a mass ratio of 3:100, and then performing melt treatment in an internal mixer at 210°C to obtain the homopolymer / copolymer polypropylene insulated cable material.
[0109] The tensile strength of the specimens was determined according to GB / T 1040.2-2006, the elongation at break of the specimens was tested according to GB / T 1040-2006, the flexural modulus was tested according to GB / T 9341-2008, and the breakdown voltage of the specimens was tested according to GB / T1408.1-2016. The insulated cable materials obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were tested, and the test results are shown in Table 1.
[0110]
[0111] As can be seen from the above examples and comparative results, the preparation method used in this application can significantly improve the tensile strength, elongation at break, flexural modulus, and breakdown field strength of the insulated cable material. Therefore, the preparation method used in this application can comprehensively improve the toughness and insulation performance of polypropylene insulated cable material.
[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A method for preparing a modified polypropylene insulated cable material, comprising: An elastomer with hydroxyl side chains is added to a silane coupling agent and stirred until the hydroxyl groups in the elastomer with hydroxyl side chains complete the condensation reaction to obtain a modified first intermediate material; the elastomer with hydroxyl side chains includes at least one of polyurethane elastomer and hydroxyl-terminated polycaprolactone; the silane coupling agent includes at least one of silane coupling agents with amino and methoxy / ethoxy groups. 4,4'-stilbene dicarboxylic acid is dispersed in a first solvent, and then a first catalyst is added to activate the carboxyl group in the 4,4'-stilbene dicarboxylic acid to obtain a second intermediate material with carboxyl group activation. The first intermediate material is added to the second intermediate material, and the first intermediate material and the second intermediate material are allowed to react fully under stirring conditions to obtain a modified elastomer; The modified elastomer was dispersed in a second solvent, and a second catalyst was added to activate the carboxyl groups in the modified elastomer. After the modified elastomer was activated, an aliphatic amine was added to obtain an alkyl-terminated elastomer. The aliphatic amine was n-octylamine. The alkyl-terminated elastomer is mixed and melted with homopolymer / copolymer polypropylene to obtain modified homopolymer / copolymer polypropylene insulated cable material.
2. The method according to claim 1, wherein, In the process of mixing and melting the alkyl-terminated elastomer with homopolymer / copolymer polypropylene to obtain modified homopolymer / copolymer polypropylene insulated cable material, the mass ratio between the alkyl-terminated elastomer and the homopolymer / copolymer polypropylene is 0.2-5:100, and the melting reaction temperature is 180-220℃.
3. The method according to claim 1, wherein, The silane coupling agent containing amino and methoxy / ethoxy groups is at least one of silane coupling agent KH550 and silane coupling agent KH792.
4. The method according to claim 1, wherein, The first catalyst is at least one of HATU, HBTU, and HCTU; the first solvent is dimethyl sulfoxide; the second catalyst is at least one of HATU, HBTU, and HCTU, and the second solvent is dimethyl sulfoxide.
5. The method according to claim 1, wherein, After adding an elastomer with hydroxyl side chains to a silane coupling agent and stirring until the hydroxyl groups in the elastomer with hydroxyl side chains complete the condensation reaction to obtain a modified first intermediate material, the process further includes: After separating the modified first intermediate material, it is dried at 50-70°C to obtain the dried first intermediate material. Accordingly, after adding the first intermediate material to the second intermediate material, and allowing the first and second intermediate materials to react fully under stirring conditions to obtain the modified elastomer, the process further includes: After separating the modified elastomer, it is dried at 50-70°C to obtain the dried modified elastomer.
6. The method according to claim 1, wherein, After adding the first intermediate material to the second intermediate material, stir at 25-80°C for 14-24 hours to allow the first and second intermediate materials to react fully; and / or After the modified elastomer is activated, a fatty amine is added, and the mixture is stirred at 25-80°C for 14-24 hours to allow the modified elastomer and the fatty amine to react fully, thereby obtaining an alkyl-terminated elastomer.
7. The application of a modified polypropylene insulated cable material in insulated cable materials, wherein, The insulating cable material includes the modified polypropylene insulating cable material prepared by the method as described in any one of claims 1 to 6.