An oil-resistant and high-temperature-resistant nylon material based on a pipe clamp and its preparation method

Abstract

The present invention relates to the technical field of composite materials, specifically a kind of oil and high temperature resistant nylon material based on pipe clamps and its preparation method; in order to improve the high temperature resistance and oil resistance of plastic pipe clamps, the present invention prepares a nylon material with oil and high temperature resistance; first, the present invention uses diphenylmethane diisocyanate as a raw material, mixes it with 1,1,3,3-tetramethyldisiloxane containing a silicon-hydrogen bond for reaction, thereby preparing a silane-modified diisocyanate containing an aromatic benzene ring structure and a silicon-oxygen bond structure. By using the benzene ring and the silicon-oxygen bond, the movement and decomposition of the polyamide molecular chain at high temperature are restricted, and the performance of high temperature resistance and resistance to oil agent erosion is enhanced; on this basis, the present invention also limits the dibasic acid, uses long carbon chain dodecanedioic acid as the dibasic acid for reaction, avoids the problem of excessive rigidity caused by too much aromatic benzene in the silane-modified diamine, and further improves the mechanical performance of the pipe clamp.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials, and specifically relates to an oil-resistant and high-temperature-resistant nylon material based on a pipe clamp and a preparation method thereof. Background Art

[0002] A pipe clamp is a type of fixing tool for fixing pipelines. According to its types, it can be divided into stainless steel pipe clamps, cast iron pipe clamps, plastic pipe clamps, etc. Among them, plastic pipe clamps are widely used in the fields of electric power, petroleum, chemical industry, medicine, etc. due to their characteristics of light weight, corrosion resistance, and good insulation. However, limited by the nature of plastics themselves, the high-temperature performance of plastic pipe clamps is poor. After a long time in a high-temperature environment, performance deterioration and other phenomena will occur, and plastics are not resistant to oil immersion and are prone to performance deterioration, which greatly limits the application of plastic pipe clamps. Summary of the Invention

[0003] The purpose of the present invention is to provide an oil-resistant and high-temperature-resistant nylon material based on a pipe clamp and a preparation method thereof to solve the problems raised in the above background art.

[0004] To solve the above technical problems, the present invention provides the following technical solution: A preparation method of an oil-resistant and high-temperature-resistant nylon material based on a pipe clamp, comprising the following steps:

[0005] S1. Prepare an oil-resistant and high-temperature-resistant modified polyamide;

[0006] S11. Under a nitrogen atmosphere, disperse diphenylmethane diisocyanate in toluene, heat up to 105±5°C, keep warm for 5-10 minutes, then cool to 10±5°C, and uniformly dropwise add 1,1,3,3-tetramethyldisiloxane to it within 1-2 hours. During the dropping process, continuously stir. After the dropping is completed, heat up to 68±2°C, reflux and stir for 0.5-2 hours, and then rotary evaporate to remove the excess solvent to obtain a silane-modified diisocyanate;

[0007] S12. Disperse the silane-modified diisocyanate in pure xylene, and ultrasonically oscillate and mix for 40-80 minutes to obtain a silane-modified diisocyanate dispersion;

[0008] Disperse bis(4-aminophenoxy)dimethylsilane in xylene, ultrasonically oscillate and disperse for 3-5 minutes, then add dibutylbis(2-ethylhexanoate)tin, continue to mix for 15-20 minutes, and then uniformly dropwise add the silane-modified diisocyanate dispersion to it within 2-4 hours. After the dropping is completed, heat up to 95±10°C, stir and react for 2-5 hours, and then rotary evaporate to remove the excess solvent to obtain a silane-modified diamine;

[0009] S13 Disperse the silane-modified diamine, dodecanedioic acid, and phosphorous acid into N,N-dimethylformamide, stir and mix for 15 - 40 min, then under the protection of a nitrogen atmosphere, set the air pressure to 10 - 50 kPa, heat up to 130 - 150 °C, keep warm for 2 - 4 h, use pure nitrogen to displace the gas atmosphere, adjust the air pressure to 10 - 50 kPa again, heat up to 280 - 300 °C, keep warm for 2 - 3 h, restore the air pressure, cool and discharge to obtain the oil-resistant and high-temperature-resistant modified polyamide;

[0010] S2. Mix polyamide 66 with the oil-resistant and high-temperature-resistant modified polyamide and compatibilizer, heat up to 270 °C, blend for 3 - 5 min, then add glass fiber, inorganic filler, antioxidant, and dispersant, continue to blend for 5 - 8 min, and then extrude and pelletize to obtain the oil-resistant and high-temperature-resistant nylon material.

[0011] Furthermore, by weight, the oil-resistant and high-temperature-resistant nylon material consists of 50 - 65 parts of polyamide 66, 20 - 25 parts of modified polyamide, 18 - 35 parts of glass fiber, 5 - 8 parts of inorganic filler, 0.5 - 1 part of compatibilizer, 0.5 - 1.5 parts of antioxidant, and 0.3 - 0.8 part of dispersant.

[0012] Furthermore, by weight, in step S11, the mass ratio of diphenylmethane diisocyanate to 1,1,3,3-tetramethyldisiloxane is 10:(2 - 2.7).

[0013] Furthermore, by weight, in step S12, the mass ratio of the silane-modified diisocyanate, bis(4-aminophenoxy)dimethylsilane, and dibutylbis(2-ethylhexanoate)tin is 10:(7 - 8.7):(0.05 - 0.12).

[0014] Furthermore, by weight, in step S13, the mass ratio of the silane-modified diamine, dodecanedioic acid, and phosphorous acid is 10:(2 - 2.2):(0.08 - 0.15).

[0015] Furthermore, the inorganic filler is antimony trioxide; the compatibilizer is any one of polyoxyethylene alkylolamide and polyoxyethylene alkylamine.

[0016] Furthermore, the antioxidant is bis(2,4-di-p-isopropylphenyl)pentaerythritol bisphosphite; the dispersant is any one of silicone and calcium stearate.

[0017] Furthermore, an oil-resistant and high-temperature-resistant nylon material based on a pipe clamp is prepared by the above method.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] In order to improve the high-temperature resistance and oil resistance of plastic pipe clamps, the present invention prepares a nylon material with oil and high-temperature resistance. First, the present invention uses diphenylmethane diisocyanate as a raw material, mixes it with 1,1,3,3-tetramethyldisiloxane containing a silicon-hydrogen bond, and reacts them to prepare a silane-modified diisocyanate containing an aromatic benzene ring structure and a silicon-oxygen bond structure. The conjugated structure of the benzene ring has high stability, which can enhance the structural stability of polyamide in a high-temperature environment. Moreover, the presence of the benzene ring also restricts the movement of polyamide molecular chains, limits the twisting and rotation of molecular chains, and inhibits the movement of the chain at high temperatures, so that the pipe clamp still has a relatively high strength working performance at high temperatures. In addition, the silicon-oxygen bond has a higher bond energy than the carbon-carbon bond, and the silicon element has strong electronegativity, which can attract the aggregation of molecular chains and enhance the resistance to external erosion at the same time, realizing the resistance of polyamide to external oil agents.

[0020] On this basis, the present invention further reacts bis(4-aminophenoxy)dimethylsilane with the silane-modified diisocyanate, thereby increasing the content of silicon-oxygen bonds and benzene rings in the reaction product again. At the same time, the present invention also limits the dibasic acid, uses dodecanedioic acid as the dibasic acid. Compared with conventional short-chain dibasic acids, dodecanedioic acid has a longer carbon chain, which can effectively avoid the problem of excessive rigidity caused by too many aromatic benzene rings in the silane-modified diamine, improve the compatibility between the synthesized oil- and high-temperature-resistant modified polyamide and polyamide 66, and avoid the incompatibility phenomenon caused by too large a difference between the two. Specific Embodiments

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] In this application, the diameter of the glass fiber used is 13 μm and the length is 3 - 4.5 mm; the polyamide 66 used is polyamide 66 of type 101L from DuPont in the United States.

[0023] Example 1. A preparation method of an oil- and high-temperature-resistant nylon material based on a pipe clamp, comprising the following steps:

[0024] S1. Prepare an oil- and high-temperature-resistant modified polyamide;

[0025] S11. By weight, in a nitrogen atmosphere, disperse 10 parts of diphenylmethane diisocyanate into toluene, heat up to 105 °C, keep warm for 5 min, then cool to 10 °C, and dropwise add 2 parts of 1,1,3,3 - tetramethyldisiloxane thereto at a uniform speed within 2 h. During the dropping process, continuously stir. After the dropping is completed, heat up to 68 °C, reflux and stir for 0.5 h, then rotary evaporate to remove the excess solvent to obtain silane - modified diisocyanate;

[0026] S12. By weight, disperse 10 parts of silane - modified diisocyanate into pure xylene, and ultrasonically oscillate and mix for 40 min to obtain a silane - modified diisocyanate dispersion;

[0027] Disperse 7 parts of bis(4 - aminophenoxy)dimethylsilane into xylene, ultrasonically oscillate and disperse for 3 min, then add 0.08 part of dibutylbis(2 - ethylhexanoate)tin, continue to mix for 15 min, and then dropwise add the silane - modified diisocyanate dispersion thereto at a uniform speed within 2 h. After the dropping is completed, heat up to 90 °C, stir and react for 2 h, then rotary evaporate to remove the excess solvent,

[0028] to obtain silane - modified diamine;

[0029] S13. By weight, disperse 10 parts of silane - modified diamine, 2 parts of dodecanedioic acid, and 0.1 part of phosphorous acid into N,N - dimethylformamide, stir and mix for 15 min, then under nitrogen atmosphere protection, set the air pressure to 40 kPa, heat up to 140 °C, keep warm for 3 h, use pure nitrogen to displace the gas atmosphere, readjust the air pressure to 40 kPa again, heat up to 290 °C, keep warm for 2 h, then restore the air pressure, cool and discharge to obtain oil - resistant and high - temperature - resistant modified polyamide;

[0030] S2. By weight, mix 60 parts of polyamide 66, 20 parts of oil - resistant and high - temperature - resistant modified polyamide, and 1 part of polyoxyethylene alkylolamide compatibilizer, heat up to 270 °C, blend for 3 min, then add 23 parts of glass fiber, 5 parts of antimony trioxide inorganic filler, 1 part of bis(2,4 - di - p - isopropylphenyl)pentaerythritol bisphosphite antioxidant, and 0.5 part of calcium stearate dispersant, continue to blend for 8 min, then extrude and pelletize to obtain an oil - resistant and high - temperature - resistant nylon material.

[0031] Example 2. A preparation method of an oil - resistant and high - temperature - resistant nylon material based on a pipe clamp, comprising the following steps:

[0032] Compared with Example 1, this example increases the addition amount of the oil - resistant and high - temperature - resistant modified polyamide in step S2;

[0033] S1. Prepare the oil - resistant and high - temperature - resistant modified polyamide;

[0034] S11. By weight, 10 parts of diphenylmethane diisocyanate are dispersed in toluene under a nitrogen atmosphere. The temperature is raised to 105 °C and kept warm for 5 min, then cooled to 10 °C. 2 parts of 1,1,3,3-tetramethyldisiloxane are added dropwise thereto at a constant rate within 2 h while stirring continuously during the dropping process. After the dropping is completed, the temperature is raised to 68 °C, and the mixture is refluxed and stirred for 0.5 h. Then, the excess solvent is removed by rotary evaporation to obtain a silane-modified diisocyanate;

[0035] S12. By weight, 10 parts of the silane-modified diisocyanate are dispersed in pure xylene. After ultrasonic oscillation and mixing for 40 min, a silane-modified diisocyanate dispersion is obtained;

[0036] 7 parts of bis(4-aminophenoxy)dimethylsilane are dispersed in xylene. After ultrasonic oscillation and dispersion for 3 min, 0.08 part of dibutylbis(2-ethylhexanoate)tin is added, and the mixture is continuously mixed for 15 min. Then, the silane-modified diisocyanate dispersion is added dropwise thereto at a constant rate within 2 h. After the dropping is completed, the temperature is raised to 90 °C, and the mixture is stirred and reacted for 2 h. Then, the excess solvent is removed by rotary evaporation,

[0037] to obtain a silane-modified diamine;

[0038] S13. By weight, 10 parts of the silane-modified diamine, 2 parts of dodecanedioic acid, and 0.1 part of phosphorous acid are dispersed in N,N-dimethylformamide. After stirring and mixing for 15 min, under the protection of a nitrogen atmosphere, the air pressure is set to 40 kPa, and the temperature is raised to 140 °C and kept warm for 3 h. Then, the gas atmosphere is replaced with pure nitrogen, the air pressure is adjusted to 40 kPa again, the temperature is raised to 290 °C, and the mixture is kept warm for 2 h. Then, the air pressure is restored, and the product is cooled and discharged to obtain an oil-resistant and high-temperature-resistant modified polyamide;

[0039] S2. By weight, 60 parts of polyamide 66, 25 parts of the oil-resistant and high-temperature-resistant modified polyamide, and 1 part of a polyoxyethylene alkyl alcohol amide compatibilizer are mixed. The temperature is raised to 270 °C, and after melt blending for 3 min, 23 parts of glass fiber, 5 parts of antimony trioxide inorganic filler, 1 part of bis(2,4-di-p-isopropylphenyl)pentaerythritol bisphosphite antioxidant, and 0.5 part of calcium stearate dispersant are added. After continuous melt blending for 8 min, the mixture is extruded and pelletized to obtain an oil-resistant and high-temperature-resistant nylon material.

[0040] Example 3. A preparation method of an oil-resistant and high-temperature-resistant nylon material based on a pipe clamp, comprising the following steps:

[0041] Compared with Example 1, the addition amount of 1,1,3,3-tetramethyldisiloxane in step S11 is increased in this example;

[0042] S1. Prepare an oil-resistant and high-temperature-resistant modified polyamide;

[0043] S11. By weight, in a nitrogen atmosphere, disperse 10 parts of diphenylmethane diisocyanate in toluene, heat up to 105 °C, keep the temperature for 5 min, then cool to 10 °C, and uniformly dropwise add 2.7 parts of 1,1,3,3 - tetramethyldisiloxane thereto within 2 h. Keep stirring during the dropping process. After the dropping is completed, heat up to 68 °C, reflux and stir for 0.5 h, then rotary evaporate to remove the excess solvent to obtain silane - modified diisocyanate;

[0044] S12. By weight, disperse 10 parts of silane - modified diisocyanate in pure xylene, and ultrasonically oscillate and mix for 40 min to obtain a silane - modified diisocyanate dispersion;

[0045] Disperse 7 parts of bis(4 - aminophenoxy)dimethylsilane in xylene, ultrasonically oscillate and disperse for 3 min, then add 0.08 part of dibutylbis(2 - ethylhexanoate)tin, continue to mix for 15 min, and uniformly dropwise add the silane - modified diisocyanate dispersion thereto within 2 h. After the dropping is completed, heat up to 90 °C, stir and react for 2 h, then rotary evaporate to remove the excess solvent to obtain silane - modified diamine;

[0046] S13. By weight, disperse 10 parts of silane - modified diamine, 2 parts of dodecanedioic acid, and 0.1 part of phosphorous acid in N,N - dimethylformamide, stir and mix for 15 min, protect under a nitrogen atmosphere, set the air pressure to 40 kPa, heat up to 140 °C, keep the temperature for 3 h, then use pure nitrogen to displace the gas atmosphere, adjust the air pressure to 40 kPa again, heat up to 290 °C, keep the temperature for 2 h, then restore the air pressure, cool and discharge to obtain oil - and high - temperature - resistant modified polyamide;

[0047] S2. By weight, mix 60 parts of polyamide 66, 20 parts of oil - and high - temperature - resistant modified polyamide, and 1 part of polyoxyethylene alkylolamide compatibilizer, heat up to 270 °C, blend for 3 min, then add 23 parts of glass fiber, 5 parts of antimony trioxide inorganic filler, 1 part of bis(2,4 - di - p - isopropylphenyl)pentaerythritol bisphosphite antioxidant, and 0.5 part of calcium stearate dispersant, continue to blend for 8 min, then extrude and pelletize to obtain an oil - and high - temperature - resistant nylon material.

[0048] Example 4. A preparation method of an oil - and high - temperature - resistant nylon material based on a pipe clamp, comprising the following steps:

[0049] Compared with Example 1, the addition amount of bis(4 - aminophenoxy)dimethylsilane in step S12 is increased in this example;

[0050] S1. Prepare oil - and high - temperature - resistant modified polyamide;

[0051] S11. By weight, in a nitrogen atmosphere, disperse 10 parts of diphenylmethane diisocyanate in toluene, heat up to 105 °C, keep warm for 5 min, then cool to 10 °C. Dropwise add 2 parts of 1,1,3,3 - tetramethyldisiloxane into it at a constant speed within 2 h. Stir continuously during the dropping process. After the dropping is completed, heat up to 68 °C, reflux and stir for 0.5 h, then rotary evaporate to remove the excess solvent to obtain silane - modified diisocyanate;

[0052] S12. By weight, disperse 10 parts of silane - modified diisocyanate in pure xylene, ultrasonically oscillate and mix for 40 min to obtain a silane - modified diisocyanate dispersion;

[0053] Disperse 8.7 parts of bis(4 - aminophenoxy)dimethylsilane in xylene, ultrasonically oscillate and disperse for 3 min, then add 0.08 part of dibutylbis(2 - ethylhexanoate)tin, continue to mix for 15 min. Dropwise add the silane - modified diisocyanate dispersion into it at a constant speed within 2 h. After the dropping is completed, heat up to 90 °C, stir and react for 2 h, then rotary evaporate to remove the excess solvent to obtain silane - modified diamine;

[0054] S13. By weight, disperse 10 parts of silane - modified diamine, 2 parts of dodecanedioic acid, and 0.1 part of phosphorous acid in N,N - dimethylformamide, stir and mix for 15 min. Under the protection of nitrogen atmosphere, set the air pressure to 40 kPa, heat up to 140 °C, keep warm for 3 h, then use pure nitrogen to displace the gas atmosphere, adjust the air pressure to 40 kPa again, heat up to 290 °C, keep warm for 2 h, then restore the air pressure, cool and discharge to obtain oil - resistant and high - temperature - resistant modified polyamide;

[0055] S2. By weight, mix 60 parts of polyamide 66, 20 parts of oil - resistant and high - temperature - resistant modified polyamide, and 1 part of polyoxyethylene alkyl alcohol amide compatibilizer, heat up to 270 °C, blend for 3 min, then add 23 parts of glass fiber, 5 parts of antimony trioxide inorganic filler, 1 part of bis(2,4 - di - p - isopropylphenyl)pentaerythritol bisphosphite antioxidant, and 0.5 part of calcium stearate dispersant, continue to blend for 8 min, then extrude and pelletize to obtain an oil - resistant and high - temperature - resistant nylon material.

[0056] Example 5. A preparation method of an oil - resistant and high - temperature - resistant nylon material based on a pipe clamp, comprising the following steps:

[0057] S1. Prepare oil - resistant and high - temperature - resistant modified polyamide;

[0058] S11. By weight, in a nitrogen atmosphere, disperse 10 parts of diphenylmethane diisocyanate in toluene, heat up to 105 °C, keep the temperature for 5 min, then cool to 10 °C, and dropwise add 2.7 parts of 1,1,3,3 - tetramethyldisiloxane to it at a constant speed within 2 h. Stir continuously during the dropping process. After the dropping is completed, heat up to 68 °C, reflux and stir for 0.5 h, then rotary evaporate to remove the excess solvent to obtain silane - modified diisocyanate;

[0059] S12. By weight, disperse 10 parts of silane - modified diisocyanate in pure xylene, and ultrasonically oscillate and mix for 40 min to obtain a silane - modified diisocyanate dispersion;

[0060] Disperse 8.7 parts of bis(4 - aminophenoxy)dimethylsilane in xylene, ultrasonically oscillate and disperse for 3 min, then add 0.08 part of dibutylbis(2 - ethylhexanoate)tin, continue to mix for 15 min, and then dropwise add the silane - modified diisocyanate dispersion to it at a constant speed within 2 h. After the dropping is completed, heat up to 90 °C, stir and react for 2 h, then rotary evaporate to remove the excess solvent to obtain silane - modified diamine;

[0061] S13. By weight, disperse 10 parts of silane - modified diamine, 2 parts of dodecanedioic acid, and 0.1 part of phosphorous acid in N,N - dimethylformamide, stir and mix for 15 min, protect under a nitrogen atmosphere, set the air pressure to 40 kPa, heat up to 140 °C, keep the temperature for 3 h, then use pure nitrogen to displace the gas atmosphere, adjust the air pressure to 40 kPa again, heat up to 290 °C, keep the temperature for 2 h, then restore the air pressure, cool and discharge to obtain oil - resistant and high - temperature - resistant modified polyamide;

[0062] S2. By weight, mix 60 parts of polyamide 66, 20 parts of oil - resistant and high - temperature - resistant modified polyamide, and 1 part of polyoxyethylene alkylolamide compatibilizer, heat up to 270 °C, blend for 3 min, then add 23 parts of glass fiber, 5 parts of antimony trioxide inorganic filler, 1 part of bis(2,4 - di - p - isopropylphenyl)pentaerythritol bisphosphite antioxidant, and 0.5 part of calcium stearate dispersant, continue to blend for 8 min, then extrude and pelletize to obtain an oil - resistant and high - temperature - resistant nylon material.

[0063] Comparative Example 1. A preparation method of an oil - resistant and high - temperature - resistant nylon material based on a pipe clamp, comprising the following steps:

[0064] Compared with Example 1, this comparative example did not prepare and add oil - resistant and high - temperature - resistant modified polyamide;

[0065] S1. Mix 60 parts by weight of polyamide 66, 23 parts of glass fiber, 5 parts of inorganic filler of antimony trioxide, 1 part of antioxidant of bis(2,4-di-p-cumenyl)pentaerythritol diphosphite, and 0.5 part of dispersant of calcium stearate. Heat up to 270 °C, continue to blend for 8 min, then extrude and pelletize to obtain an oil-resistant and high-temperature-resistant nylon material.

[0066] Comparative Example 2. A preparation method of an oil-resistant and high-temperature-resistant nylon material based on a pipe clamp, comprising the following steps:

[0067] Compared with Example 1, the addition amount of the oil-resistant and high-temperature-resistant modified polyamide in step S2 is increased in this comparative example;

[0068] S1. Prepare an oil-resistant and high-temperature-resistant modified polyamide;

[0069] S11. Under a nitrogen atmosphere, disperse 10 parts by weight of diphenylmethane diisocyanate in toluene, heat up to 105 °C, keep warm for 5 min, then cool to 10 °C, and uniformly dropwise add 2 parts of 1,1,3,3-tetramethyldisiloxane thereto within 2 h. Stir continuously during the dropping process. After the dropping is completed, heat up to 68 °C, reflux and stir for 0.5 h, then rotary evaporate to remove the excess solvent to obtain a silane-modified diisocyanate;

[0070] S12. Disperse 10 parts by weight of the silane-modified diisocyanate in pure xylene, and ultrasonically oscillate and mix for 40 min to obtain a silane-modified diisocyanate dispersion;

[0071] Disperse 7 parts of bis(4-aminophenoxy)dimethylsilane in xylene, ultrasonically oscillate and disperse for 3 min, then add 0.08 part of dibutylbis(2-ethylhexanoate)tin, continue to mix for 15 min, and then uniformly dropwise add the silane-modified diisocyanate dispersion thereto within 2 h. After the dropping is completed, heat up to 90 °C, stir and react for 2 h, then rotary evaporate to remove the excess solvent,

[0072] to obtain a silane-modified diamine;

[0073] S13. Disperse 10 parts by weight of the silane-modified diamine, 2 parts of dodecanedioic acid, and 0.1 part of phosphorous acid in N,N-dimethylformamide, stir and mix for 15 min, protect under a nitrogen atmosphere, set the air pressure to 40 kPa, heat up to 140 °C, keep warm for 3 h, then use pure nitrogen to displace the gas atmosphere, adjust the air pressure to 40 kPa again, heat up to 290 °C, keep warm for 2 h, then restore the air pressure, cool and discharge to obtain an oil-resistant and high-temperature-resistant modified polyamide;

[0074] S2. By weight, 60 parts of polyamide 66, 60 parts of oil-resistant and high-temperature-resistant modified polyamide, and 1 part of polyoxyethylene alkylolamide compatibilizer are mixed, heated to 270 °C, and after blending for 3 min, 23 parts of glass fiber, 5 parts of antimony trioxide inorganic filler, 1 part of bis(2,4-di-p-cumylphenyl)pentaerythritol diphosphite antioxidant, and 0.5 part of calcium stearate dispersant are added. After continuing to blend for 8 min, it is extruded and pelletized to obtain an oil-resistant and high-temperature-resistant nylon material.

[0075] Detection: The oil-resistant and high-temperature-resistant nylon materials prepared in Examples 1-5 and Comparative Examples 1-2 are injection-molded into test specimens, and the tensile strength of the specimens prepared in Examples 1-5 and Comparative Examples 1-2 is tested according to ISO527-2; the flexural strength of the specimens prepared in Examples 1-5 and Comparative Examples 1-2 is tested according to ISO178;

[0076] The specimens prepared in Examples 1-5 and Comparative Examples 1-2 are placed in an oven at 140 °C for 1000 h, and then their tensile strength and flexural strength are tested again;

[0077] The specimens prepared in Examples 1-5 and Comparative Examples 1-2 are immersed in 98# gasoline at 25 °C for 5 days and then taken out, and their weight changes are tested; the test results are shown in the following table;

[0078]

[0079] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation method of an oil-resistant and high-temperature-resistant nylon material based on a pipe clamp, characterized in that, It includes the following steps: S1. Prepare oil-resistant and high-temperature-resistant modified polyamide; S11. Under a nitrogen atmosphere, disperse diphenylmethane diisocyanate in toluene, heat up to 105 ± 5 °C, keep warm for 5 - 10 min, then cool to 10 ± 5 °C, and uniformly dropwise add 1,1,3,3 - tetramethyldisiloxane into it within 1 - 2 h. During the dropping process, continuously stir. After the dropping is completed, heat up to 68 ± 2 °C, reflux and stir for 0.5 - 2 h, then rotary evaporate to remove the excess solvent to obtain silane-modified diisocyanate; Among them, the mass ratio of the diphenylmethane diisocyanate to 1,1,3,3 - tetramethyldisiloxane is 10:(2 - 2.7); S12. Disperse the silane-modified diisocyanate in pure xylene, and ultrasonically oscillate and mix for 40 - 80 min to obtain a silane-modified diisocyanate dispersion; Disperse bis(4 - aminophenoxy)dimethylsilane in xylene, ultrasonically oscillate and disperse for 3 - 5 min, then add dibutylbis(2 - ethylhexanoate)tin, continue to mix for 15 - 20 min, and uniformly dropwise add the silane-modified diisocyanate dispersion into it within 2 - 4 h. After the dropping is completed, heat up to 95 ± 10 °C, stir and react for 2 - 5 h, then rotary evaporate to remove the excess solvent to obtain silane-modified diamine; Among them, the mass ratio of the silane-modified diisocyanate, bis(4 - aminophenoxy)dimethylsilane, and dibutylbis(2 - ethylhexanoate)tin is 10:(7 - 8.7):(0.05 - 0.12); S13 Disperse the silane-modified diamine, dodecanedioic acid, and phosphorous acid in N,N - dimethylformamide, stir and mix for 15 - 40 min, protect under a nitrogen atmosphere, set the air pressure to 10 - 50 kPa, heat up to 130 - 150 °C, keep warm for 2 - 4 h, then use pure nitrogen to displace the gas atmosphere, adjust the air pressure to 10 - 50 kPa again, heat up to 280 - 300 °C, keep warm for 2 - 3 h, then restore the air pressure, cool and discharge to obtain oil-resistant and high-temperature-resistant modified polyamide; Among them, the mass ratio of the silane-modified diamine, dodecanedioic acid, and phosphorous acid is 10:(2 - 2.2):(0.08 - 0.15); S2. Mix polyamide 66 with the oil-resistant and high-temperature-resistant modified polyamide and a compatibilizer, heat up to 270 °C, blend for 3 - 5 min, then add glass fiber, inorganic filler, antioxidant, and dispersant, continue to blend for 5 - 8 min, and then extrude and pelletize to obtain an oil-resistant and high-temperature-resistant nylon material; Among them, by weight, the oil-resistant and high-temperature-resistant nylon material consists of 50 - 65 parts of polyamide 66, 20 - 25 parts of modified polyamide, 18 - 35 parts of glass fiber, 5 - 8 parts of inorganic filler, 0.5 - 1 part of compatibilizer, 0.5 - 1.5 parts of antioxidant, and 0.3 - 0.8 part of dispersant; The inorganic filler is antimony trioxide; the compatibilizer is any one of polyoxyethylene alkylolamide and polyoxyethylene alkylamine.

2. The preparation method of an oil-resistant and high-temperature-resistant nylon material based on a pipe clamp according to claim 1, characterized in that: The antioxidant is bis(2,4 - di - p - isopropylphenyl)pentaerythritol bisphosphite; the dispersant is any one of silicone and calcium stearate.

3. A oil-resistant and high-temperature-resistant nylon material based on pipe clamps prepared by the preparation method according to any one of claims 1-2.

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