An intercooler pipe with excellent processability and a preparation method thereof

Abstract

The application relates to the technical field of intercooling pipelines, in particular to an intercooling pipeline with excellent processing performance and a preparation method thereof. The intercooling pipeline is composed of an NBR inner layer, an aramid wire reinforcing layer and a CR outer layer. The CR outer layer is composed of the following components in weight: CR 80-95 parts, NBR 5-20 parts, carbon black 40-70 parts, light calcium carbonate 30-60 parts, plasticizer 10-30 parts, stearic acid 1-5 parts, anti-aging agent 4010NA 0.5-3 parts, anti-aging agent RD 0.5-3 parts, paraffin 0.5-3 parts, active magnesium oxide 3-6 parts, processing aid 1-5 parts, zinc oxide 3-6 parts, special anti-scorching agent 0.5-3 parts, accelerator MBTS-75 0.5-3 parts and accelerator TMTD-80 0.5-2 parts.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intercooler pipelines, in particular to an intercooler pipeline with excellent processing performance and a preparation method thereof. BACKGROUND

[0002] The main function of the intercooler is to reduce the intake air temperature of the engine, which is particularly important for turbocharged engines. The turbocharger compresses the air, which increases its temperature and reduces its density. If not cooled, the high-temperature air directly entering the engine will cause performance degradation or even stall. The intercooler can improve power output and reduce the risk of engine knock by reducing the intake air temperature.

[0003] The rubber pipeline connected to the cold end of the intercooler is usually an NBR (nitrile rubber) / CR (chloroprene rubber), CR / CR structure product. The inner diameter of the intercooler pipeline product is relatively large, usually between 30~60mm. Domestic chloroprene rubber is comparable to imported products in terms of product performance, but its processability is poor. Therefore, when using low-cost domestic chloroprene rubber to manufacture intercooler pipelines, there are problems such as poor mixing process, poor extrusion flowability, and easy scorching. Solving the above problems can achieve low-cost products and has practical significance.

[0004] Therefore, we propose an intercooler pipeline with excellent processing performance and a preparation method thereof. SUMMARY

[0005] The present application aims to provide an intercooler pipeline with excellent processing performance and a preparation method thereof to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] An intercooler pipeline with excellent processing performance is composed of an NBR inner layer, an aramid fiber reinforced layer, and a CR outer layer. The CR outer layer is composed of the following weight components: CR 80~95 parts, NBR 5~20 parts, carbon black 40~70 parts, light calcium carbonate 30~60 parts, plasticizer 10~30 parts, stearic acid 1~5 parts, antioxidant 4010NA 0.5~3 parts, antioxidant RD 0.5~3 parts, paraffin 0.5~3 parts, active magnesium oxide 3~6 parts, processing aid 1~5 parts, zinc oxide 3~6 parts, special anti-scorching agent 0.5~3 parts, accelerator MBTS-75 0.5~3 parts, and accelerator TMTD-80 0.5~2 parts.

[0008] More preferably, the special anti-scorching agent is CR-X.

[0009] More preferably, the preparation method of the CR outer layer is as follows:

[0010] Step one: put CR and NBR into the internal mixer for premixing, heat to 70-80℃, add carbon black, light calcium carbonate, plasticizer, stearic acid, antioxidant 4010NA, antioxidant RD, paraffin wax, active magnesium oxide, processing aid, mix evenly, 90-110℃ plug, 120-130℃ discharge, cutter 2-4 times, glue 2-3min, stop for 8-24h, get masterbatch;

[0011] Step two: put the masterbatch into the internal mixer, add zinc oxide, special anti-scorching agent, accelerator MBTS-75, accelerator TMTD-80, mix evenly, 60-70℃ plug, 80-100℃ discharge, cutter 2-4 times, glue 2-3min, get CR outer layer.

[0012] More preferably, in step one, the speed of the internal mixer is 20-30r / min.

[0013] More preferably, in step one, the speed of the internal mixer is 15-25r / min

[0014] More preferably, the thickness of the NBR inner layer is 2-3mm, and the thickness of the CR outer layer is 1.5-2.5mm.

[0015] More preferably, the light calcium carbonate is modified, and the specific process is as follows:

[0016] Step A: mix light calcium carbonate, anhydrous ethanol, deionized water, and 3-(2,3-epoxypropoxy) propyl trimethoxysilane evenly, react at 50-70℃ for 6-12h, filter, wash, and dry to get epoxidized light calcium carbonate;

[0017] Step B: mix epoxidized light calcium carbonate, amino-containing modifier, and N,N-dimethylformamide evenly, react at 50-60℃ for 10-12h, introduce nitrogen, mix isocyanate-terminated polybutadiene and dibutyltin dilaurate evenly, react at 70-80℃ for 3-5h, cool to room temperature, filter, wash, and dry to get modified light calcium carbonate.

[0018] More preferably, in step A, the mass ratio of light calcium carbonate, anhydrous ethanol, deionized water, and 3-(2,3-epoxypropoxy) propyl trimethoxysilane is 1: (10-12): (2-4): (0.3-0.5).

[0019] More preferably, in step B, the mass ratio of epoxidized light calcium carbonate, amino-containing modifier, and N,N-dimethylformamide is 1: (0.5-2.0): (4-6).

[0020] More preferably, in step B, the amount of said terminal isocyanate group polybutadiene is 50-150% of the mass of the epoxidized light calcium carbonate.

[0021] More preferably, in step B, the amount of said dibutyltin dilaurate is 0.1-0.3% of the mass of the epoxidized light calcium carbonate.

[0022] More preferably, in step B, the preparation step of said amino-containing modifier is as follows:

[0023] Maleic anhydride, polyethylene glycol monomethyl ether, p-toluenesulfonic acid and hydroquinone and toluene are mixed uniformly, and reacted at 110-120℃ for 5-7h, and then distilled under reduced pressure to obtain polyethylene glycol monomethyl ether monomaleate; polyethylene glycol monomethyl ether monomaleate, 2-amino-5-mercapto-1,3,4-thiadiazole and N,N-dimethylformamide are mixed uniformly, and a photoinitiator is added, and then irradiated with ultraviolet light for 20-40min to obtain an amino-containing modifier.

[0024] In the above technical solution, polyethylene glycol monomethyl ether monomaleate is generated by reacting maleic anhydride with polyethylene glycol monomethyl ether; 2-amino-5-mercapto-1,3,4-thiadiazole is grafted onto polyethylene glycol monomethyl ether monomaleate by using a mercapto-ene click reaction to prepare an amino-containing modifier; by introducing a thiazole structure, the vulcanization rate is accelerated; 2-amino-5-mercapto-1,3,4-thiadiazole has a similar mercaptothiazole structure to the accelerator MBTS-75, and thus plays the role of a vulcanization accelerator.

[0025] More preferably, the mass ratio of said maleic anhydride, polyethylene glycol monomethyl ether, p-toluenesulfonic acid, hydroquinone and toluene is 1: (8-10): (0.03-0.05): (0.02-0.04): (5-10).

[0026] More preferably, the mass ratio of said polyethylene glycol monomethyl ether monomaleate, 2-amino-5-mercapto-1,3,4-thiadiazole and N,N-dimethylformamide is 1: (0.2-0.5): (4-6).

[0027] More preferably, said photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone, and the amount thereof is 1-3% of the mass of the polyethylene glycol monomethyl ether monomaleate.

[0028] More preferably, the wavelength of said ultraviolet light irradiation is 360-380nm, and the irradiation intensity is 25-35mW / cm 2 .

[0029] A method for preparing a middle cooling pipeline with excellent processability, comprising the following steps:

[0030] Step S1: heating and mixing butyl nitrile rubber, and then extruding to form an NBR inner layer;

[0031] Step S2: weaving aramid fibers on the outer surface of the NBR inner layer to form an aramid fiber reinforced layer, and obtaining a woven inner layer;

[0032] Step S3: introducing the woven inner layer into a CR outer layer extruder, and then extruding to obtain a charge air cooling pipeline.

[0033] More preferably, in step S3, the temperature of the head of the extruder is 60-80 DEG C, the temperature of the extrusion section is 50-70 DEG C, the temperature of the plasticizing section is 50-70 DEG C, and the temperature of the screw section is 30-60 DEG C.

[0034] Compared with the prior art, the application has the following beneficial effects:

[0035] 1. The application discloses a charge air cooling pipeline with excellent processing performance and a preparation method thereof. By adding butyl nitrile rubber to the chlorobutyl rubber formula, adjusting the formula components, and combining the effects of plasticizers and special anti-scorching agents and other additives, the problem of chlorobutyl rubber extrusion process is successfully solved, and the fuel oil resistance and the bonding performance with other rubber types are significantly improved. The butyl nitrile rubber adopts a 3350 series with a Mooney value of about 50, which is similar to the Mooney value of chlorobutyl rubber, and is more conducive to dispersion and blending. When the amount of butyl nitrile rubber is less than 20 parts, the butyl nitrile rubber and chlorobutyl rubber have a special synergistic effect with the special anti-scorching agent CR-X, which can effectively improve the anti-scorching performance of chlorobutyl rubber without reducing the ozone resistance of chlorobutyl rubber (the greater the amount of butyl nitrile rubber, the worse the ozone resistance), thereby greatly improving the processing safety. The special anti-scorching agent CR-X is a special anti-scorching agent for chlorobutyl rubber, and does not inhibit the vulcanization of the butyl nitrile rubber part in the butyl nitrile rubber and chlorobutyl rubber blending system. The magnesium oxide is active magnesium oxide, which can improve the anti-scorching performance of the rubber compound. The accelerator MBTS-75 and the accelerator TMTD-80 are accelerators for chlorobutyl rubber and vulcanizing agents for butyl nitrile rubber, which can ensure sufficient crosslinking. Compared with the traditional sulfur vulcanization system, the formula of the application has more excellent product properties.

[0036] 2. The application discloses a middle cooling pipeline with excellent processability and a preparation method thereof, wherein light calcium carbonate is surface-modified by 3-(2,3-epoxypropoxy) propyl trimethoxysilane to obtain epoxidized light calcium carbonate, so as to improve the dispersion uniformity of the light calcium carbonate in a rubber matrix; then, the epoxidized light calcium carbonate is reacted with an amino-containing modifier to introduce a PEG long chain and a thiazole structure, the long chain structure forms steric hindrance in the rubber matrix, the compatibility of the light calcium carbonate with the rubber is improved, local stress concentration is reduced, the mechanical properties and chemical stability of the material are significantly improved, and the service life of the product is prolonged; meanwhile, hydroxyl groups are generated in the amino and epoxy ring-opening reaction process, and the hydroxyl groups continue to react with isocyanate-terminated polybutadiene to introduce a polybutadiene structure, the polybutadiene can interact with the rubber, the compatibility with the rubber matrix is further improved, and the overall performance of the material is improved. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0038] The following parts are mass parts, unless otherwise specified. It should be noted that there is no special restriction on the purchase manufacturers of all raw materials involved in the application, which exemplarily includes (in the embodiment) CR: chloroprene rubber, with a brand of 322-2; NBR: nitrile rubber, with a brand of E3350; carbon black: with a brand of Cabot N550; light calcium carbonate: with a particle size of 1250 mesh; plasticizer: with a brand of TP-95; paraffin wax: No. 58 semi-refined paraffin wax; active magnesium oxide: with a brand of KYOWA MAG 150; processing aid: with a brand of Struktol WB16; zinc oxide: with a brand of META-Z L40, from Shanghai Jodie Chemical Co., Ltd.; polyethylene glycol monomethyl ether: with a model of M813521, from Shanghai Maikelin Biochemical Technology Co., Ltd.

[0039] Embodiment 1: A preparation method of a middle cooling pipeline with excellent processability, comprising the following processes.

[0040] Step S1: after heating and mixing the nitrile rubber, the nitrile rubber is extruded to form an NBR inner layer;

[0041] Step S2: aramid fibers are woven on the outer surface of the NBR inner layer to form an aramid fiber reinforced layer, so as to obtain a woven inner layer;

[0042] Step S3: introducing the woven inner layer into the CR outer layer extruder, after extrusion, a medium cooling pipeline is obtained; the head temperature of the extruder is 60℃, the extrusion section temperature is 50℃, the plasticizing section temperature is 50℃, and the screw section temperature is 30℃;

[0043] The preparation method of the CR outer layer is as follows:

[0044] Step one: 80 parts of CR and 20 parts of NBR are put into a mixer to be premixed, the rotating speed of the mixer is 20 r / min, the temperature is raised to 80℃, 40 parts of carbon black, 30 parts of light calcium carbonate, 10 parts of plasticizer, 1 part of stearic acid, 0.5 parts of antioxidant 4010NA, 0.5 parts of antioxidant RD, 0.5 parts of paraffin, 3 parts of active magnesium oxide, and 1 part of processing aid are uniformly mixed, the temperature is raised to 90℃, the glue is discharged at 120℃, the cutter is used twice, the glue is poured for 2 minutes, and then the mixture is left to stand for 8 hours to obtain a masterbatch;

[0045] Step two: the masterbatch is put into a mixer, the rotating speed of the mixer is 15 r / min, 3 parts of zinc oxide, 0.5 parts of special anti-scorching agent, 0.5 parts of accelerator MBTS-75, and 0.5 parts of accelerator TMTD-80 are uniformly mixed, the temperature is raised to 60℃, the glue is discharged at 80℃, the cutter is used twice, and the glue is poured for 2 minutes to obtain the CR outer layer.

[0046] Example 2: a preparation method of a medium cooling pipeline with excellent processability, comprising the following processes:

[0047] Step S1: heating and mixing nitrile rubber and then extruding to form an NBR inner layer;

[0048] Step S2: weaving aramid fibers on the outer surface of the NBR inner layer to form an aramid fiber reinforced layer, thereby obtaining a woven inner layer;

[0049] Step S3: introducing the woven inner layer into a CR outer layer extruder, after extrusion, a medium cooling pipeline is obtained; the head temperature of the extruder is 70℃, the extrusion section temperature is 60℃, the plasticizing section temperature is 60℃, and the screw section temperature is 50℃;

[0050] The preparation method of the CR outer layer is as follows:

[0051] Step one: 90 parts of CR and 10 parts of NBR are put into a mixer to be premixed, the rotating speed of the mixer is 25 r / min, the temperature is raised to 75℃, 50 parts of carbon black, 40 parts of light calcium carbonate, 20 parts of plasticizer, 3 parts of stearic acid, 1 part of antioxidant 4010NA, 1 part of antioxidant RD, 1 part of paraffin, 4 parts of active magnesium oxide, and 3 parts of processing aid are uniformly mixed, the temperature is raised to 100℃, the glue is discharged at 125℃, the cutter is used three times, the glue is poured for 2.5 minutes, and then the mixture is left to stand for 10 hours to obtain a masterbatch;

[0052] Step two: put the masterbatch into the internal mixer, the rotating speed of the internal mixer is 20r / min, add 5 parts of zinc oxide, 2 parts of special anti-scorching agent, 2 parts of accelerator MBTS-75, 1 part of accelerator TMTD-80, mix uniformly, 65℃ plug, 90℃ discharge, cutter 3 times, glue pouring 2.5min, get CR outer layer.

[0053] Example 3: a preparation method of a middle cold pipeline with excellent processability, comprising the following processes:

[0054] Step S1: heat and mix the nitrile rubber, then extrude to form an NBR inner layer;

[0055] Step S2: weave aramid fibers on the outer surface of the NBR inner layer to form an aramid fiber reinforced layer, to obtain a woven inner layer;

[0056] Step S3: introduce the woven inner layer into a CR outer layer extruder, after extrusion, obtain a middle cold pipeline; the head temperature of the extruder is 80℃, the extrusion section temperature is 70℃, the plasticizing section temperature is 70℃, and the screw section temperature is 60℃;

[0057] The preparation method of the CR outer layer is as follows:

[0058] Step one: put 95 parts of CR and 5 parts of NBR into the internal mixer for premixing, the rotating speed of the internal mixer is 30r / min, heat to 80℃, add 70 parts of carbon black, 60 parts of light calcium carbonate, 30 parts of plasticizer, 5 parts of stearic acid, 3 parts of antioxidant 4010NA, 3 parts of antioxidant RD, 3 parts of paraffin, 6 parts of active magnesium oxide, 5 parts of processing aid, mix uniformly, 110℃ plug, 130℃ discharge, cutter 4 times, glue pouring 3min, stop for 24h, to obtain a masterbatch;

[0059] Step two: put the masterbatch into the internal mixer, the rotating speed of the internal mixer is 25r / min, add 6 parts of zinc oxide, 3 parts of special anti-scorching agent, 3 parts of accelerator MBTS-75, 2 parts of accelerator TMTD-80, mix uniformly, 70℃ plug, 100℃ discharge, cutter 4 times, glue pouring 3min, to obtain a CR outer layer.

[0060] Example 4: a preparation method of a middle cold pipeline with excellent processability, comprising the following processes:

[0061] Based on example 2, the light calcium carbonate in example 4 is modified, and the remaining process steps and reaction parameters are consistent with example 2; the specific process is as follows:

[0062] Step A: mix 40 parts of light calcium carbonate, 400 parts of anhydrous ethanol, 80 parts of deionized water and 12 parts of 3-(2,3-epoxypropoxy) propyl trimethoxysilane uniformly, react at 50℃ for 6h, filter, wash and dry, to obtain an epoxidized light calcium carbonate;

[0063] Step B: 5 parts of maleic anhydride, 40 parts of polyethylene glycol monomethyl ether, 0.15 parts of p-toluenesulfonic acid and 0.1 parts of hydroquinone and 25 parts of toluene were mixed uniformly, reacted at 110°C for 5h, distilled under reduced pressure to obtain polyethylene glycol monomethyl ether monomaleate; 40 parts of polyethylene glycol monomethyl ether monomaleate, 8 parts of 2-amino-5-mercapto-1, 3, 4-thiadiazole and 160 parts of N, N-dimethylformamide were mixed uniformly, 0.4 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone was added, and it was irradiated by 360nm ultraviolet light for 20min, the irradiation intensity was 25mW / cm 2 , to obtain an amino-containing modifier;

[0064] 40 parts of epoxidized light calcium carbonate, 20 parts of amino-containing modifier and 160 parts of N, N-dimethylformamide were mixed uniformly, reacted at 50°C for 10h, nitrogen was introduced, 20 parts of terminal isocyanate group polybutadiene and 0.04 parts of dibutyltin dilaurate were mixed uniformly, reacted at 70°C for 3h, cooled to room temperature, filtered, washed and dried to obtain modified light calcium carbonate.

[0065] Example 5: a preparation method of a middle cooling pipeline with excellent processability, comprising the following processes:

[0066] Based on example 2, the light calcium carbonate in example 5 was modified, and the remaining process steps and reaction parameters were consistent with example 2; the specific process is as follows:

[0067] Step A: 40 parts of light calcium carbonate and 440 parts of anhydrous ethanol, 120 parts of deionized water, 1.6 parts of 3-(2, 3-epoxypropoxy) propyl trimethoxysilane were mixed uniformly, reacted at 60°C for 10h, filtered, washed and dried to obtain epoxidized light calcium carbonate;

[0068] Step B: 5 parts of maleic anhydride, 45 parts of polyethylene glycol monomethyl ether, 0.2 parts of p-toluenesulfonic acid and 0.15 parts of hydroquinone and 40 parts of toluene were mixed uniformly, reacted at 115°C for 6h, distilled under reduced pressure to obtain polyethylene glycol monomethyl ether monomaleate; 40 parts of polyethylene glycol monomethyl ether monomaleate, 1.2 parts of 2-amino-5-mercapto-1, 3, 4-thiadiazole and 200 parts of N, N-dimethylformamide were mixed uniformly, 0.8 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone was added, and it was irradiated by 370nm ultraviolet light for 30min, the irradiation intensity was 30mW / cm 2 , to obtain an amino-containing modifier;

[0069] Mix 40 parts of the epoxidized light calcium carbonate, 40 parts of the amino-containing modifier and 200 parts of N,N-dimethylformamide uniformly, and react at 55°C for 11 h. Introduce nitrogen, and mix 40 parts of the terminal isocyanate group-containing polybutadiene and 0.08 parts of dibutyltin dilaurate uniformly, and react at 75°C for 4 h. Cool to room temperature, filter, wash and dry to obtain the modified light calcium carbonate.

[0070] Example 6: A preparation method of a middle cooling pipeline with excellent processability, comprising the following processes:

[0071] On the basis of Example 2, the light calcium carbonate in Example 6 is modified, and the remaining process steps and reaction parameters are consistent with those in Example 2. The specific process is as follows:

[0072] Step A: Mix 40 parts of light calcium carbonate, 480 parts of anhydrous ethanol, 160 parts of deionized water and 20 parts of 3-(2,3-epoxypropoxy) propyl trimethoxysilane uniformly, and react at 70°C for 12 h. Filter, wash and dry to obtain the epoxidized light calcium carbonate;

[0073] Step B: Mix 8 parts of maleic anhydride, 80 parts of polyethylene glycol monomethyl ether, 0.4 parts of p-toluenesulfonic acid, 0.32 parts of hydroquinone and 80 parts of toluene uniformly, and react at 120°C for 7 h. Distill under reduced pressure to obtain the polyethylene glycol monomethyl ether monomaleate. Mix 80 parts of the polyethylene glycol monomethyl ether monomaleate, 40 parts of 2-amino-5-mercapto-1,3,4-thiadiazole and 480 parts of N,N-dimethylformamide uniformly, and add 2.4 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone. Irradiate under 380 nm ultraviolet light for 40 min, and the irradiation intensity is 35 mW / cm 2 to obtain the amino-containing modifier;

[0074] Mix 40 parts of the epoxidized light calcium carbonate, 80 parts of the amino-containing modifier and 240 parts of N,N-dimethylformamide uniformly, and react at 60°C for 12 h. Introduce nitrogen, and mix 60 parts of the terminal isocyanate group-containing polybutadiene and 0.12 parts of dibutyltin dilaurate uniformly, and react at 80°C for 5 h. Cool to room temperature, filter, wash and dry to obtain the modified light calcium carbonate.

[0075] Comparative Example 1: Based on Example 2, the mass ratio of CR to NBR in Comparative Example 1 is 7:3, and the remaining process steps and reaction parameters are consistent with Example 2; the outer layer of CR in Comparative Example 2 is composed of the following weight components: CR 70 parts, NBR 30 parts, carbon black 50 parts, light calcium carbonate 40 parts, plasticizer 20 parts, stearic acid 3 parts, antioxidant 4010NA 1 part, antioxidant RD 1 part, paraffin 1 part, active magnesium oxide 4 parts, processing aid 3 parts, zinc oxide 5 parts, special anti-scorching agent 2 parts, accelerator MBTS-75 2 parts, accelerator TMTD-80 1 part.

[0076] Comparative Example 2: Based on Example 2, the mass ratio of CR to NBR in Comparative Example 2 is 6:4, and the remaining process steps and reaction parameters are consistent with Example 2; the outer layer of CR in Comparative Example 2 is composed of the following weight components: CR 60 parts, NBR 40 parts, carbon black 50 parts, light calcium carbonate 40 parts, plasticizer 20 parts, stearic acid 3 parts, antioxidant 4010NA 1 part, antioxidant RD 1 part, paraffin 1 part, active magnesium oxide 4 parts, processing aid 3 parts, zinc oxide 5 parts, special anti-scorching agent 2 parts, accelerator MBTS-75 2 parts, accelerator TMTD-80 1 part.

[0077] Comparative Example 3: Based on Example 2, no special anti-scorching agent is added in Comparative Example 3, and the remaining process steps and reaction parameters are consistent with Example 2; the outer layer of CR in Comparative Example 3 is composed of the following weight components: CR 90 parts, NBR 10 parts, carbon black 50 parts, light calcium carbonate 40 parts, plasticizer 20 parts, stearic acid 3 parts, antioxidant 4010NA 1 part, antioxidant RD 1 part, paraffin 1 part, active magnesium oxide 4 parts, processing aid 3 parts, zinc oxide 5 parts, special anti-scorching agent 2 parts, accelerator MBTS-75 2 parts, accelerator TMTD-80 1 part.

[0078] Comparative Example 4: Based on Example 5, the modified light calcium carbonate in Comparative Example 4 is replaced by the same mass of epoxidized light calcium carbonate, and the remaining process steps and reaction parameters are consistent with Example 5.

[0079] The preparation method of the epoxidized light calcium carbonate is as follows: 40 parts of light calcium carbonate, 480 parts of anhydrous ethanol, 160 parts of deionized water, and 20 parts of 3-(2,3-epoxypropoxy) propyl trimethoxysilane are uniformly mixed and reacted at 70°C for 12h, filtered, washed, and dried to obtain the epoxidized light calcium carbonate.

[0080] Experiment: The outer layer of CR obtained in Examples 1-6 and Comparative Examples 1-4 is taken to prepare samples, and the performance of each sample is detected and the detection results are recorded:

[0081] Hardness was tested according to GB / T 531.1-2008; tensile properties were tested according to GB / T 528-2009, the tensile speed was 500mm / min; Mooney scorch was tested according to GB / T 1233-2008, the testing temperature was 125℃; Mooney viscosity was tested according to GB / T 1232.1-2016; dynamic ozone resistance test: the test was carried out at 20% elongation, 500pphm ozone concentration, 40℃ temperature and 0.5Hz frequency, and the product was placed for 70 hours, and whether cracking phenomenon appeared was observed.

[0082] The test results are shown in Table 1.

[0083] Table 1. CR outer layer related performance test results

[0084]

[0085] It can be seen from Examples 1-6 and Comparative Examples 1-4 that the CR outer layer prepared by the present application has excellent mechanical properties, long scorch time, qualified dynamic ozone resistance, high processing safety, and excellent overall performance. The dynamic ozone resistance of the product obtained in Comparative Example 1 and Comparative Example 2 decreased due to the change of the component ratio of the CR outer layer; the Mooney scorch time of the product obtained in Comparative Example 3 was shortened because no special scorch inhibitor was added; compared with Example 5, the product obtained in Comparative Example 4 did not introduce amino-containing modifier and isocyanate-terminated polybutadiene, resulting in a decrease in the compatibility between light calcium carbonate and each component, thereby causing the performance of the product to decrease.

[0086] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the present application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalents of the claims are therefore intended to be embraced therein.

Claims

1. A type of intercooling pipeline with excellent processing performance, characterized in that: It is composed of NBR inner layer, aramid fiber reinforced layer and CR outer layer; the CR outer layer is composed of the following components by weight: CR 80-95 parts, NBR 5-20 parts, carbon black 40-70 parts, light calcium carbonate 30-60 parts, plasticizer 10-30 parts, stearic acid 1-5 parts, antioxidant 4010NA 0.5-3 parts, antioxidant RD 0.5-3 parts, paraffin 0.5-3 parts, active magnesium oxide 3-6 parts, processing aid 1-5 parts, zinc oxide 3-6 parts, special anti-scorching agent 0.5-3 parts, accelerator MBTS-75 0.5-3 parts, accelerator TMTD-80 0.5-2 parts; The light calcium carbonate is subjected to modification treatment, and the specific process is as follows: Step A: the light calcium carbonate, anhydrous ethanol, deionized water and 3-(2,3-epoxypropoxy) propyl trimethoxysilane are uniformly mixed, and then reacted at 50-70℃ for 6-12h, filtered, washed and dried to obtain the epoxidized light calcium carbonate; Step B: the epoxidized light calcium carbonate, the amino-containing modifier and N,N-dimethylformamide are uniformly mixed, and then reacted at 50-60℃ for 10-12h, nitrogen is introduced, the terminal isocyanate group-containing polybutadiene and dibutyltin dilaurate are uniformly mixed, and then reacted at 70-80℃ for 3-5h, cooled to room temperature, filtered, washed and dried to obtain the modified light calcium carbonate.

2. The intercooler line having excellent processability according to claim 1, characterized by: The thickness of the NBR inner layer is 2-3mm, and the thickness of the CR outer layer is 1.5-2.5mm.

3. The intermediate cooling line having excellent processability according to claim 2, characterized in that: The preparation method of the CR outer layer is as follows: Step one: the CR and NBR are put into a mixing mill for premixing, heated to 70-80℃, and then the carbon black, light calcium carbonate, plasticizer, stearic acid, antioxidant 4010NA, antioxidant RD, paraffin, active magnesium oxide and processing aid are uniformly mixed, the temperature is increased to 90-110℃, the glue is discharged at 120-130℃, the cutter is used for 2-4 times, the glue is poured for 2-3min, and then the mixture is placed for 8-24h to obtain the masterbatch; Step two: the masterbatch is put into a mixing mill, the zinc oxide, special anti-scorching agent, accelerator MBTS-75 and accelerator TMTD-80 are uniformly mixed, the temperature is increased to 60-70℃, the glue is discharged at 80-100℃, the cutter is used for 2-4 times, and the glue is poured for 2-3min to obtain the CR outer layer.

4. The intercooler line according to claim 1, wherein: In step A, the mass ratio of the light calcium carbonate, anhydrous ethanol, deionized water and 3-(2,3-epoxypropoxy) propyl trimethoxysilane is 1: (10-12): (2-4): (0.3-0.5).

5. The intercooler line according to claim 1, wherein: In step B, the mass ratio of the epoxidized light calcium carbonate, amino-containing modifier and N,N-dimethylformamide is 1: (0.5-2.0): (4-6).

6. The intercooler line according to claim 5, wherein: The preparation steps of the amino-containing modifier are as follows: Maleic anhydride, polyethylene glycol monomethyl ether, p-toluenesulfonic acid and hydroquinone and toluene are mixed uniformly, and reacted at 110-120℃ for 5-7h, distilled under reduced pressure to obtain polyethylene glycol monomethyl ether monomaleate; polyethylene glycol monomethyl ether monomaleate, 2-amino-5-mercapto-1,3,4-thiadiazole and N,N-dimethylformamide are mixed uniformly, and a photoinitiator is added, and irradiated by ultraviolet light for 20-40min to obtain an amino-containing modifier.

7. The intercooler line having excellent processability according to claim 6, characterized by: The mass ratio of the polyethylene glycol monomethyl ether monomaleate, 2-amino-5-mercapto-1,3,4-thiadiazole and N,N-dimethylformamide is 1:(0.2-0.5):(4-6).

8. The method of claim 1-7, wherein the method is characterized by: The method comprises the following steps: Step S1: heating and mixing butadiene-acrylonitrile rubber, and then extruding to form an NBR inner layer; Step S2: weaving aramid fibers on the outer surface of the NBR inner layer to form an aramid fiber reinforced layer, and obtaining a woven inner layer; Step S3: introducing the woven inner layer into a CR outer layer extruder, and then extruding to obtain a medium cooling pipeline.

9. The method of producing an intercooler line having excellent processability according to claim 8, characterized by: In step S3, the head temperature of the extruder is 60-80℃, the extrusion section temperature is 50-70℃, the plasticizing section temperature is 50-70℃, and the screw section temperature is 30-60℃.

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