Weather-resistant and chemical-resistant nylon cable tie material as well as preparation method and application thereof

Abstract

The invention relates to a weather-resistant and chemical-resistant nylon cable tie material as well as a preparation method and application thereof. The nylon cable tie material comprises the following raw material components in percentage by mass: 72%-83% of polyamide resin, 15%-25% of a toughening agent, 0.2%-1% of a nucleating agent, 0.3%-1.5% of an antioxidant, 0.08%-0.35% of a long-acting stabilizer and 0.5%-2% of a lubricant. The polyamide resin comprises a first resin and a second resin in a mass ratio of 1: (0.2-0.3), the first resin is PA66, and the second resin comprises PA46 and PA56; the toughening agent is prepared from maleic anhydride grafted POE (Polyolefin Elastomer), maleic anhydride grafted SEBS (Styrene-Ethylene-Butylene-Styrene) and maleic anhydride grafted silicone rubber according to the mass ratio of (0.5 to 2): (0.5 to 2): 1. Under the synergistic effect of the raw material components of the nylon cable tie material, a cable tie prepared from the nylon cable tie material has excellent mechanical properties at normal temperature, can still maintain high mechanical strength and good toughness under high and low temperature conditions, shows excellent chemical resistance, and has good application prospects. And the cable tie is especially suitable for the field of automobiles with higher requirements on long-acting weather resistance and broad-spectrum chemical resistance of the cable tie.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a weather-resistant and chemical-resistant nylon cable tie material, its preparation method, and its application. Background Technology

[0002] Nylon cable ties, as a common fastening and wiring component, are widely used in electronics, industrial packaging, construction, and automotive industries due to their ease of use, low cost, and good mechanical strength. Nylon 66 (PA66), in particular, is one of the preferred materials for manufacturing high-performance cable ties due to its high strength, stiffness, and heat resistance. However, with the continuous expansion and increasing demands of application areas, especially in the modern automotive industry, extremely high requirements are placed on the long-term reliability of cable ties. Cable ties in areas such as the engine compartment and chassis of automobiles need to be exposed to complex environments of drastic temperature changes, corrosion from various chemicals (such as engine oil, transmission fluid, brake fluid, coolant, and detergents), and natural aging caused by ultraviolet radiation and humidity. Traditional PA66 cable tie materials cannot meet the performance requirements of automotive cable ties under such harsh conditions, mainly due to the following drawbacks: (1) Significant degradation of mechanical properties at high and low temperatures: Under normal conditions, PA66 cable ties have sufficient tensile strength and toughness. However, at high temperatures (e.g., engine compartment environments above 85 °C), their rigidity and strength will decrease significantly, leading to loosening of the cable ties, insufficient fastening force, and even creep fracture. At low temperatures (e.g., cold environments below -30 °C), the material's toughness decreases sharply and its brittleness increases, making it extremely prone to brittle fracture when subjected to vibration or impact. This instability in high and low temperature performance severely restricts its application in critical automotive parts.

[0003] (2) Insufficient chemical resistance: The amide bond (-CO-NH-) in the PA66 molecular structure has strong polarity, making it sensitive to a variety of chemicals, especially acidic media, alcohols and ethylene glycol-based coolants. After long-term contact, the material is prone to swelling, hydrolysis or stress cracking, resulting in molecular chain breakage, which leads to permanent loss of mechanical strength of the cable tie and poses a great safety hazard.

[0004] (3) Poor long-term weather resistance: Under long-term ultraviolet radiation and humid heat oxidation, the PA66 molecular chain will undergo photo-oxidation and thermal oxidation degradation, resulting in powdering, discoloration and embrittlement of the material surface, and a significant decrease in mechanical properties, which cannot meet the design life requirements of automotive parts for several years or even more than ten years.

[0005] To address these issues, common methods include adding elastomers for toughening, glass fiber reinforcement, mineral fillers, and introducing antioxidants and light stabilizers. However, these methods often have limitations: for example, a large amount of toughening agent is usually required to achieve a significant toughening effect, but conventional elastomers have poor compatibility with PA66, and as the content increases, the material's rigidity and strength decrease significantly, and its chemical resistance also deteriorates; simple glass fiber reinforcement can improve room temperature strength and heat resistance, but it exacerbates the material's low-temperature brittleness, worsens processing performance, and affects product reliability; conventional additives are difficult to provide comprehensive and effective protection under long-term, complex, and multi-factor aging; and simple blending modification can easily lead to poor compatibility of components, resulting in phase separation, which in turn damages the overall performance of the material.

[0006] Therefore, there is an urgent need in this field to develop a new type of nylon cable tie material. This material not only needs to possess excellent mechanical properties at room temperature, but more importantly, it needs to maintain a balance between high mechanical strength and good toughness across a wide temperature range, from low to high temperatures, through careful selection and synergistic design of its various raw material components. Simultaneously, it must exhibit broad-spectrum tolerance to a variety of chemicals and excellent long-term weather resistance, thereby meeting the stringent requirements of high-end applications such as the automotive industry for the reliability, safety, and longevity of cable tie products. Summary of the Invention

[0007] Therefore, this invention provides a weather-resistant and chemical-resistant nylon cable tie material, its preparation method, and its application. Through synergistic optimization of components such as resin base material and toughening agent, the prepared cable tie not only has excellent mechanical properties at room temperature, but also maintains high mechanical strength and good toughness under high and low temperature conditions, and exhibits excellent chemical resistance. It is especially suitable for the automotive field, which has higher requirements for long-term weather resistance and broad-spectrum chemical resistance of cable ties.

[0008] Specifically, the following technical solutions are provided: The first aspect of this invention provides a weather-resistant and chemical-resistant nylon cable tie material, which, by weight percentage, comprises the following raw material components: 72%-83% polyamide resin, 15%-25% toughening agent, 0.2%-1% nucleating agent, 0.3%-1.5% antioxidant, 0.08%-0.35% long-lasting stabilizer, and 0.5%-2% lubricant; The polyamide resin comprises a first resin and a second resin in a mass ratio of 1:(0.2-0.3), wherein the first resin is PA66 and the second resin comprises PA46 and PA56; The toughening agent comprises maleic anhydride-grafted POE, maleic anhydride-grafted SEBS, and maleic anhydride-grafted silicone rubber in a mass ratio of (0.5-2):(0.5-2):1.

[0009] To address the problems of significant degradation of mechanical properties at high and low temperatures, insufficient chemical resistance, and poor long-term weather resistance in existing PA66 cable tie materials, this invention synergistically optimizes components such as the resin base and toughening agent. This results in cable ties that not only possess excellent mechanical properties at room temperature but also maintain high mechanical strength and good toughness under high and low temperature conditions, exhibiting excellent chemical resistance. Specifically, this invention uses PA66 as the main resin base to provide basic strength. Simultaneously, it introduces appropriate amounts of maleic anhydride-grafted POE, maleic anhydride-grafted SEBS, and maleic anhydride-grafted silicone rubber, compounded in a certain mass ratio, to synergistically toughen the resin base, further improving the cable tie's toughness at room temperature, low temperature, and high temperature. Furthermore, PA46, with its high amide bond density and crystallinity, and PA56, with its low amide bond density and long carbon chain, are introduced to improve the heat resistance and chemical resistance of the cable ties. The three resin bases, when blended, form a micro-phase separation structure. The highly crystalline regions of PA46 act as physical crosslinking points, enhancing tensile strength and flexural modulus, especially at high temperatures. Meanwhile, the amorphous regions of PA56 increase chain segment mobility, improving impact strength and elongation at break. This "rigid-flexible" structure avoids the performance limitations of a single material, achieving a balance between strength and toughness.

[0010] In addition, by using the above three toughening agents, the present invention can form covalent bonds through the reaction of maleic anhydride with the terminal amine groups of the resin matrix, ensuring good interfacial adhesion and effective stress transfer. After mixing, the elastomer particles form a multi-scale dispersed phase (from nanometer to micrometer) in the matrix, inducing multiple crazes and shear yielding, synergistically improving impact strength and fatigue life without significantly reducing the tensile strength of the matrix. Among them, maleic anhydride-grafted POE has excellent toughness and elasticity, providing basic toughness; maleic anhydride-grafted SEBS has styrene hard segments and saturated ethylene-butene soft segments, providing good thermal stability and low-temperature performance (maintaining excellent toughness at low temperatures), and has a small dispersion size, which can synergistically toughen with POE; while maleic anhydride-grafted silicone rubber has excellent heat resistance, low-temperature elasticity and hydrophobicity, so that the cable tie can maintain elasticity at extremely low and high temperatures. At the same time, the hydrophobicity of silicone rubber can block the penetration of water and other polar chemicals, and the saturated chain structure of SEBS has good oxidation and solvent resistance. Combined with the chemical bonding of toughening agents and resin base materials, it significantly reduces interface defects. Under the above synergistic effect, the overall chemical resistance of the cable tie is effectively improved.

[0011] It should be noted that in this invention, in order to ensure that the cable ties can retain the excellent comprehensive performance of PA66, and to reinforce and modify them by introducing appropriate amounts of PA46 and PA56, and to avoid the addition of too much PA45 and PA56 from affecting the overall mechanical strength of the material, the mass ratio of the first resin (PA66) to the second resin (PA46 and PA56) in the resin base material needs to be controlled within the range of 1:(0.2-0.3) and the mass percentage of the total resin base material needs to be controlled within the range of 72%-83% to achieve synergistic benefits. Unlike conventional nylon cable tie materials where the amount of toughening agent added is typically 10%-15% of the resin base, the total amount of toughening agent in the weather-resistant and chemical-resistant nylon cable tie material provided by this invention is no less than 15% of the total amount of nylon cable tie material. This is because the resin base of this invention contains high-rigidity and high-brittleness PA46. To effectively toughen this high-rigidity blend, more elastomer particles are needed to initiate and terminate crazing / shear banding, consuming more impact energy, thereby producing sufficient toughening effect. However, excessive addition is not allowed, as excessive toughening agent will affect the rigidity, strength, and heat distortion temperature of the material. Therefore, the total amount of toughening agent must be controlled to not exceed 25% of the total amount of nylon cable tie material. In addition, since the toughening effects of the three toughening agents differ at different temperatures, the addition amounts of the three toughening agents—maleic anhydride-grafted POE, maleic anhydride-grafted SEBS, and maleic anhydride-grafted silicone rubber—must be controlled within the range of (0.5-2):(0.5-2):1 to ensure that all three toughening agents can be present in an effective amount, thereby achieving effective toughening at different temperatures (high temperature, room temperature, and low temperature).

[0012] Furthermore, the preferred mass ratio of PA46 to PA56 in the second resin is 1:(0.8-1.2), such as 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, etc., including but not limited to the mass ratios listed above. In this invention, if the mass ratio of PA46 to PA56 is greater than 1:0.8, the excessive amount added will cause the system to become too rigid. A small amount of PA56 cannot effectively toughen its brittle amorphous region, and the material as a whole will be biased towards the brittleness of PA46, resulting in poor low-temperature performance. However, if the mass ratio of PA46 to PA56 is less than 1:1.2, although the toughness is very good, it cannot meet the required support strength and high-temperature performance of the cable tie.

[0013] Further, the grafting rate of maleic anhydride-grafted POE is preferably 0.6%-1.2%, such as 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, etc.; the grafting rate of maleic anhydride-grafted SEBS is preferably 1.2%-2.0%, such as 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, etc.; and the grafting rate of maleic anhydride-grafted silicone rubber is preferably 0.6%-1.0%, such as 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, etc., including but not limited to the grafting rates listed above.

[0014] Further, the preparation method of the maleic anhydride-grafted silicone rubber is as follows: silicone rubber and initiator dicumyl peroxide (DCP) are added to an extruder, pre-reacted at 170 degrees Celsius, then maleic anhydride is added, the temperature is raised to 190 degrees Celsius, and the silicone rubber is extruded to obtain the maleic anhydride-grafted silicone rubber; the mass ratio of silicone rubber to dicumyl peroxide and maleic anhydride is 98.4:0.1:1.5, and the molecular weight of the silicone rubber is 100,000-150,000.

[0015] Furthermore, the ratio of the total mass of maleic anhydride-grafted POE and maleic anhydride-grafted SEBS to the mass of maleic anhydride-grafted silicone rubber in the toughening agent is preferably (1.5-2.5):1, for example 1.875:1, 2:1, etc. More preferably, the mass ratio of maleic anhydride-grafted POE to maleic anhydride-grafted SEBS is 1:(0.8-1.2), for example 1:1, 1:1.1, etc.

[0016] Further, the nucleating agent is selected from one or more of Clariant NAV101, sodium benzoate, and talc; more preferably, the nucleating agent is obtained by compounding Clariant NAV101 and / or sodium benzoate with talc; preferably, the talc is 6000-8000 mesh. Organic sodium salt nucleating agents are expensive; using a compound of organic sodium salt and inorganic talc can effectively reduce costs while ensuring good nucleation effect.

[0017] Further, the antioxidant is selected from one or more of antioxidants 1098, 1010, 168, 626, and PS802; more preferably, the antioxidant is obtained by compounding antioxidants 1098 and / or 1010, antioxidants 168 and / or 626 with antioxidant PS802. Antioxidant 1098 and / or 1010, as the main antioxidant, can effectively protect polyamide and prevent polyamide from being degraded by heat and oxygen during modification processing and molding. Antioxidant 168 and / or 626, as the auxiliary antioxidant, works better in combination with the main antioxidant. Antioxidant PS802 can prevent the toughening agent in the formula from undergoing thermo-oxidative aging during processing and long-term thermo-oxidative environment, which would lead to product degradation and performance decline. Under the synergistic effect of the above antioxidants, the stability of the product under thermo-oxidative environment can be effectively improved.

[0018] Furthermore, the long-acting stabilizer includes CuI and / or KI; more preferably, the long-acting stabilizer is obtained by compounding CuI and KI.

[0019] Further, the lubricant includes PE wax and / or calcium stearate; more preferably, the lubricant is a compound of PE wax and calcium stearate.

[0020] Further, by weight percentage, the weather-resistant and chemical-resistant nylon cable tie material comprises the following raw material components: PA66 60%-65%, PA46 6%-9%, PA56 6%-9%, maleic anhydride-grafted POE 5%-8%, maleic anhydride-grafted SEBS 5%-8%, maleic anhydride-grafted silicone rubber 5%-8%, Clariant NAV101 0.1%-0.3%, talc 0.1%-0.3%, antioxidant 1098 0.1%-0.4%, antioxidant 168 0.1%-0.4%, antioxidant PS802 0.2%-0.3%, CuI 0.02%-0.1%, KI 0.06%-0.25%, PE wax 0.3%-1%, and calcium stearate 0.3%-1%.

[0021] A second aspect of this invention provides a method for preparing the weather-resistant and chemical-resistant nylon cable tie material described in the first aspect, comprising the following steps: S1. Weigh and mix each raw material component according to the formula of nylon cable tie material to obtain a blend; S2. The blend is granulated in a twin-screw granulator to obtain the weather-resistant and chemical-resistant nylon cable tie material. The twin-screw granulator comprises eleven zones. In the granulation process, the temperature of zone one is 220-240 ℃, the temperatures of zones two to five are 260-270 ℃, the temperatures of zones six to nine are 270-290 ℃, the temperatures of zones ten to eleven are 270-280 ℃, the die temperature is 280 ℃, and the screw speed is 600-700 rpm. Further, in step S1, the polyamide resin in the raw material components is dried to control the moisture content to no more than 0.02%, and then mixed with other raw material components. The preferred drying temperature is 110-120 ℃.

[0022] A third aspect of the present invention provides an automotive cable tie made from the weather-resistant and chemical-resistant nylon cable tie material described in the first aspect.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a weather-resistant and chemical-resistant nylon cable tie material. Cable ties made from this material not only possess excellent mechanical properties at room temperature, with a tensile strength ≥65 MPa, elongation at break ≥140%, and notched impact strength of a simply supported beam ≥26 KJ / m, but also exhibit superior mechanical properties. 2 It also maintains high mechanical strength and good toughness under high and low temperature conditions. The heat distortion temperature (0.45 MPa) is ≥170 ℃, and the retention rates of tensile strength and notched impact strength at 150 ℃ and 1000 h are ≥98% and 90%, respectively; at 150 ℃ and 2000 h, the retention rates are ≥90% and 80%, respectively; and the notched impact strength at -40 ℃ and 120 h is ≥21 KJ / m. 2 Notched impact strength at -60 ℃ for 120 h ≥16 KJ / m 2 Furthermore, it exhibits excellent chemical resistance, showing no cracking or etching after immersion in gasoline, battery electrolyte, and a 50% aqueous solution of ethylene glycol for 48 hours, with tensile strength and notched impact strength retention rates of ≥80% and ≥80%, respectively. Cable ties made from the nylon cable tie material provided by this invention meet the stringent requirements of high-end application fields such as the automotive industry for the reliability, safety, and longevity of cable tie products. Attached Figure Description

[0024] Figure 1 The nylon cable tie material prepared using Example 1; Figure 2 The cable tie is made using the nylon cable tie material prepared in Example 1 and a black masterbatch. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms “comprising” or “including” used in this invention may also be replaced with the closed form “is” or “consisting of”.

[0027] The sources of some of the raw materials used in the following embodiments and comparative examples are as follows:

[0028] Apart from the raw materials mentioned above, all other raw materials are commercially available materials.

[0029] The preparation method of maleic anhydride-grafted silicone rubber used in the following examples and comparative examples is as follows: Weigh silicone rubber (Sirbo, PDM-101) granules (molecular weight 600,000-700,000), dicumyl peroxide, and maleic anhydride in a mass ratio of 98.4:0.1:1.5. Weighed silicone rubber granules and dicumyl peroxide were added to a twin-screw extruder through the main feed port and pre-reacted at 170 °C. Then, maleic anhydride was added to the side feed port and grafting reaction was carried out in the reaction zone at 190 °C. The grafted product was extruded through the die head, cooled, and pelletized to obtain maleic anhydride-grafted silicone rubber. Example 1

[0030] This embodiment relates to a weather-resistant and chemical-resistant nylon cable tie material and its preparation. The specific operations are as follows: By weight percentage, the weather-resistant and chemical-resistant nylon cable tie material comprises the following raw material components: PA66 60.2%, PA46 7.5%, PA56 7.5%, maleic anhydride-grafted POE 7%, maleic anhydride-grafted SEBS 8%, maleic anhydride-grafted silicone rubber 8%, Clariant NAV101 0.1%, talc 0.1%, antioxidant 1098 0.1%, antioxidant 168 0.1%, antioxidant PS802 0.2%, PE wax 0.6%, calcium stearate 0.3%, CuI 0.1%, and KI 0.2%.

[0031] Weigh each material according to the above nylon cable tie material formula, dry PA66, PA46 and PA56 at 110 ℃ for 12 h to obtain a resin base material with a moisture content of less than 0.02%, and then add each material to a high-speed mixer and stir thoroughly for 30 min to obtain a blend.

[0032] The blend is fed into the hopper of a twin-screw extruder via a feeding system, and then granulated by twin-screw extrusion to obtain weather-resistant and chemical-resistant nylon cable tape. The twin-screw granulator consists of eleven zones. During the granulation process, the temperature in zone one is 230°C, the temperature in zones two through five is 260°C, the temperature in zones six through nine is 270°C, the temperature in zones ten and eleven is 280°C, the die temperature is 280°C, and the screw speed is 700 rpm. Examples 2-10 and Comparative Examples 1-10

[0033] Examples 2-10 and Comparative Examples 1-10 respectively provide weather-resistant and chemical-resistant nylon cable tie materials. The only difference between them and Example 1 is that the types or contents of resin base materials and / or toughening agents in the resin composition formulation are different, while the rest are the same.

[0034] The types and contents of resin base materials and toughening agents in the weather-resistant and chemical-resistant nylon cable tie materials prepared in Examples 1-10 and Comparative Examples 1-10 are shown in Table 1 below, where A1 is the first resin and A2 is the second resin.

[0035] Table 1

[0036] In the table, A1:A2 represents the mass ratio of the first resin to the second resin, and B1:B2:B3 represents the mass ratio of the three toughening agents. Application and performance testing

[0037] (1) The weather-resistant and chemical-resistant nylon cable tie materials prepared in the above examples and comparative examples were injection molded into test strips according to ISO standards, and the following performance tests were performed on the test strips: Tensile strength test: Tested according to ISO 527 standard.

[0038] Elongation at break test: Tested according to ISO 527 standard.

[0039] Notched impact strength test of simply supported beam: tested according to ISO 179 standard.

[0040] Heat distortion temperature test: Tested according to ISO 75 standard. Tensile strength and notched impact strength retention rate tests at 150 ℃ and 1000 h: Tested according to ISO 527 and ISO 179 standards.

[0041] Tensile strength and notched impact strength retention rate tests at 150 ℃ and 2000 h: Tested according to ISO 527 and ISO 179 standards.

[0042] -40 ℃, 120 h Notched impact strength test: Tested according to ISO 179 standard.

[0043] -60 ℃, 120 h Notched impact strength test: Tested according to ISO 179 standard.

[0044] The test results are shown in Tables 2 and 3 below: Table 2. Test results of mechanical properties of the spline at room temperature

[0045] Table 3. High and low temperature performance test results of the spline

[0046] As shown in Tables 2 and 3, compared with the nylon cable tie material prepared in Comparative Example 1, the nylon cable tie materials prepared in Examples 1-10 not only have higher mechanical strength and toughness at room temperature, but also maintain excellent mechanical properties under high and low temperature conditions. In contrast, the mechanical properties of the samples prepared in Comparative Example 1 deteriorate significantly under high and low temperatures.

[0047] Furthermore, as shown in Examples 1, 7, and 8, the amount of PA46 or PA56 added affects the mechanical strength and toughness of the specimen. Compared to Example 1, Example 7 added more PA46 and relatively less PA56. Although the strength of the prepared specimen was slightly improved, the toughness (elongation at break) decreased significantly. The specimen prepared by increasing PA56 and decreasing PA46 (Example 8) showed improved toughness but a greater decrease in strength. Moreover, the weather resistance of the samples prepared in Examples 7 and 8 was not as good as that in Example 1. More preferably, when the ratio of PA46 to PA56 is controlled in the range of 1:(0.8-1.2), the overall mechanical properties and weather resistance of the specimen are better.

[0048] As can be seen from Examples 1, 9, and 10, when the total amount of the three toughening agents is the same, changing the amount of each toughening agent will affect the weather resistance of the sample. Under the premise that the ratio of the total mass of maleic anhydride-grafted POE, maleic anhydride-grafted SEBS, and maleic anhydride-grafted silicone rubber is (0.5-2):(0.5-2):1, more preferably, the ratio of the total mass of maleic anhydride-grafted POE and maleic anhydride-grafted SEBS to the mass of maleic anhydride-grafted silicone rubber is controlled within the range of (1.5-2.5):1. The prepared sample can maintain excellent mechanical properties under both high and low temperature conditions.

[0049] As shown in Example 1 and Comparative Examples 1-4, changing the type of resin matrix has a significant impact on the mechanical properties of the samples at different temperatures. Introducing appropriate amounts of PA46 and PA56 not only effectively improves the overall mechanical properties of the samples at room temperature but also maintains excellent tensile strength and toughness at both high and low temperatures. It is worth noting that during the research and development process, the inventors used Nylon 6T instead of PA46 to prepare nylon cable tie material. However, experimental results showed that the toughness of the sample (Comparative Example 4) was significantly reduced, even inferior to the sample prepared without the introduction of other resin matrix materials (Comparative Example 1). In contrast, the present invention, by introducing appropriate amounts of PA46 and PA56 in conjunction with other components, produces a sample that possesses both excellent tensile strength and toughness.

[0050] As can be seen from Example 1 and Comparative Examples 5 and 6, too much or too little resin base material will not only affect the mechanical strength of the sample, but also reduce the toughness of the sample. Preferably, the proportion of resin base material in nylon cable tie material is controlled between 72% and 83%, and the overall performance of the nylon cable tie material products prepared is better.

[0051] As demonstrated in Example 1 and Comparative Examples 7-10, the type of toughening agent has a significant impact on the weather resistance of the samples. Nylon cable tie materials prepared by adding only one or two toughening agents, or by replacing maleic anhydride-grafted SEBS with the commonly used toughening agent maleic anhydride-grafted EPDM, cannot simultaneously maintain the mechanical properties of the products under high and low temperature conditions. Compared to Comparative Examples 7-10, this invention, through the synergistic toughening effect of adding three toughening agents—maleic anhydride-grafted POE, maleic anhydride-grafted SEBS, and maleic anhydride-grafted silicone rubber—significantly improves the weather resistance of the nylon cable tie samples.

[0052] In summary, the present invention obtains nylon narrow strip material by synergistically optimizing the resin base material and toughening agent components. The strips prepared from it not only have excellent mechanical properties at room temperature, but also maintain high mechanical strength and good toughness under high and low temperature conditions.

[0053] (2) Further chemical resistance tests were conducted on the strips made from the nylon cable tie materials prepared in Examples 1-10 and Comparative Example 1. Specifically, each sample was immersed in gasoline, battery electrolyte, and 50% aqueous ethylene glycol solution for 48 hours. The samples were observed for cracking and etching. The tensile strength and notched impact strength retention rate at room temperature were further tested.

[0054] The test results are shown in Table 1 below. Table 4 Results of Chemical Resistance Tests for Samples

[0055] As shown in Table 4, compared with the sample prepared in Comparative Example 1, the samples prepared in Examples 1-10 have better stability in gasoline, battery electrolyte, and 50% aqueous solution of ethylene glycol, and exhibit superior chemical resistance.

[0056] The embodiments described above are merely preferred embodiments for fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A weatherable, chemical resistant nylon strapping material characterized in that, The weather-resistant and chemical-resistant nylon strap material comprises the following raw material components in percentage by mass: polyamide resin 72%-83%, toughening agent 15%-25%, nucleating agent 0.2%-1%, antioxidant 0.3%-1.5%, long-acting stabilizer 0.08%-0.35%, lubricant 0.5%-2%; The polyamide resin comprises a first resin and a second resin in a mass ratio of 1:(0.2-0.3), the first resin is PA66, and the second resin comprises PA46 and PA56. The toughening agent comprises maleic anhydride grafted POE, maleic anhydride grafted SEBS and maleic anhydride grafted silicone rubber in a mass ratio of (0.5-2):(0.5-2):

1.

2. The weatherable, chemical resistant nylon tie tape of claim 1, wherein, The second resin is a mixed resin of PA46 and PA56, and the mass ratio of PA46 to PA56 in the second resin is 1:(0.8-1.2).

3. The weatherable, chemical resistant nylon tie strap material of claim 1, wherein, At least one of the following features is included: (1) The grafting rate of the maleic anhydride grafted POE is 0.6%-1.2%; (2) The grafting rate of the maleic anhydride grafted SEBS is 1.2%-2.0%; (3) The grafting rate of the maleic anhydride grafted silicone rubber is 0.6%-1.0%; (4) The mass ratio of the total mass of the maleic anhydride grafted POE and the maleic anhydride grafted SEBS to the mass of the maleic anhydride grafted silicone rubber in the toughening agent is (1.5-2.5):

1.

4. The weatherable, chemical resistant nylon cord stock of claim 3, wherein, The mass ratio of the maleic anhydride grafted POE to the maleic anhydride grafted SEBS is 1:(1-1.2).

5. The weatherable, chemical resistant nylon cord stock of claim 1, wherein, The nucleating agent is selected from one or more of Clariant NAV101, sodium benzoate and talc; The antioxidant is selected from one or more of antioxidants 1098, 1010, 168, 626 and PS802; The long-acting stabilizer comprises CuI and / or KI; The lubricant comprises PE wax and / or calcium stearate.

6. The weatherable, chemical resistant nylon cord stock of claim 5, wherein, The nucleating agent is obtained by compounding Clariant NAV101 and / or sodium benzoate with talc; The antioxidant is obtained by compounding antioxidants 1098 and / or 1010, antioxidant 168 and / or 626 with antioxidant PS802; The long-acting stabilizer is obtained by compounding CuI and KI; The lubricant is obtained by compounding PE wax and calcium stearate.

7. The weatherable, chemical resistant nylon cord stock of claim 6, wherein, The weather-resistant and chemical-resistant nylon strap material comprises the following raw material components in percentage by mass: PA66 60%-65%, PA46 6%-9%, PA56 6%-9%, maleic anhydride grafted POE 5%-8%, maleic anhydride grafted SEBS 5%-8%, maleic anhydride grafted silicone rubber 5%-8%, Clariant NAV101 0.1%-0.3%, talc 0.1%-0.3%, antioxidant 1098 0.1%-0.4%, antioxidant 168 0.1%-0.4%, antioxidant PS802 0.2%-0.3%, CuI 0.02%-0.1%, KI 0.06%-0.25%, PE wax 0.3%-1%, calcium stearate 0.3%-1%.

8. A process for the preparation of the weatherable, chemical resistant nylon strapping material of any one of claims 1 to 7, characterized in that, The following steps are included: S1, each raw material component is weighed according to the formula of the nylon tie tape and mixed to obtain a blend; S2, the blend is granulated in a double screw granulator to obtain the weather-resistant and chemical-resistant nylon tie tape; the double screw granulator comprises eleven zones, and in the granulation process, the temperature of the first zone is 220-240 DEG C, the temperature of the second zone to the fifth zone is all 260-270 DEG C, the temperature of the sixth zone to the ninth zone is all 270-290 DEG C, the temperature of the tenth zone to the eleventh zone is all 270-280 DEG C, the temperature of the die is 280 DEG C, and the screw rotation speed is 600-700 rpm.

9. The production method according to claim 8, characterized by, In step S1, the polyamide resin in the raw material components is subjected to drying treatment, and the moisture is controlled to be not more than 0.02%, and then mixed with other raw material components.

10. A car tie-down, characterized in that The weather-resistant and chemical-resistant nylon tie tape is prepared from any one of claims 1-7.

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