High-strength nylon resin and preparation method thereof

Abstract

The present application relates to the technical field of polymer coatings, and specifically discloses a high-strength nylon resin and a preparation method thereof. The high-strength nylon resin comprises a nylon main material, an epoxy resin, a reinforcing filler, a vinyl silicone oil, a curing agent, an antioxidant, and an ultraviolet stabilizer; the preparation method of the high-strength nylon resin comprises grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pre-treated filler; the pre-treated filler, the nylon main material, the epoxy resin, the curing agent, the antioxidant, and the ultraviolet stabilizer are added into a high-speed mixer, and after being stirred and mixed evenly, the mixture is extruded and granulated to obtain the desired high-strength nylon resin; the present application has a simple formula, and by adding the epoxy resin into the nylon main material, the hygroscopicity of the nylon main material can be improved while improving the adhesion between the final nylon resin and the substrate; the above-mentioned preparation method is simple, the preparation conditions are mild, and it is suitable for industrial production, and the obtained high-strength nylon resin has excellent strength, toughness, fluidity, processability and adhesion effect, etc.

Description

Technical Field

[0001] The present application relates to the technical field of polymer coatings, and more specifically, to a high-strength nylon resin and a preparation method thereof. Background Art

[0002] Polyamide is commonly known as nylon, or PA for short. Polyamide resin is a type of polymer containing an amide group (-NHCO-) ​​on the main chain. It is the earliest developed, largest-volume, and most widely used variety among the five general-purpose engineering plastics. Polyamide resin is widely used in electronics, automobiles, mechanical equipment, daily necessities, and other fields due to its excellent mechanical properties, self-lubrication, heat resistance, wear resistance, fatigue resistance, and solvent resistance. Among them, in the automotive industry, in order to obtain the best color match between different parts, the usual practice is to spray the surfaces of different parts with the same color paint. Due to its excellent performance, nylon has become one of the main materials for spraying automotive parts.

[0003] There is a strong interaction force between nylon molecular chains, which is easy to form hydrogen bonds, so that the molecular chains are arranged neatly and have good crystallization performance. It has high crystallinity, large cohesive energy, low surface tension, and low surface polarity. It has the problem of poor adhesion to metal substrates when used for spraying automotive parts. In the related art, in order to improve the adhesion effect of nylon coating and metal substrate, a primer with good bonding strength is usually selected to first perform a primer treatment on the surface of the substrate, and the bonding strength of the nylon coating and the metal substrate is increased by the primer. The above method has complicated procedures, high costs, and high scrap rate. In addition, in order to improve the mechanical properties, dimensional stability, heat resistance, aging resistance, etc. of nylon, 30% of glass fiber is usually added to nylon resin. While glass fiber reinforces nylon, it also causes the fluidity of nylon to deteriorate, resulting in poor powder coating of nylon coating and low efficiency, which limits the application of nylon coating, especially in the field of automobile industry. Based on the above statement, the present application provides a high-strength nylon resin and a preparation method thereof, which aims to improve the fluidity and adhesion of nylon resin while strengthening nylon resin. Summary of the invention

[0004] In order to solve the problems of poor fluidity and poor adhesion of current reinforced nylon resins, the present application provides a high-strength nylon resin and a preparation method thereof.

[0005] In the first aspect, the present application provides a high-strength nylon resin, which adopts the following technical solution:

[0006] A high-strength nylon resin comprises the following raw materials in parts by weight: 100 parts of nylon main material, 8-12 parts of epoxy resin, 14-18 parts of reinforcing filler, 3-5 parts of vinyl silicone oil, 4-8 parts of curing agent, 0.1-0.5 parts of antioxidant and 0.1-0.3 parts of ultraviolet stabilizer.

[0007] Preferably, the high-strength nylon resin comprises the following raw materials in parts by weight: 100 parts of nylon main material, 10 parts of epoxy resin, 16 parts of reinforcing filler, 4 parts of vinyl silicone oil, 6 parts of curing agent, 0.3 parts of antioxidant, and 0.2 parts of ultraviolet stabilizer.

[0008] Preferably, the nylon main material includes PA66 and PA612; the mass ratio of PA66 to PA612 is 3-4:1-2.

[0009] By adopting the above technical scheme, PA66 and PA612 are selected as the main nylon material, and the mixing ratio is controlled, so that the obtained nylon main material can have excellent strength, toughness, resilience and wear resistance at the same time; by adding epoxy resin which has good compatibility with the nylon main material and low hygroscopicity, the hygroscopicity of the nylon main material can be improved while the surface bonding force between the nylon main material and the reinforcing filler is improved, and the adhesion between the nylon resin and the metal substrate is improved; the addition of vinyl silicone oil can fully disperse the raw materials, improve the dispersion stability of the reinforcing filler in the system, and further enhance the strength, fluidity, processability and adhesion effect of the finally obtained nylon resin.

[0010] Preferably, the epoxy resin comprises bisphenol A epoxy resin and dicyclopentadiene epoxy resin, and the mass ratio of the bisphenol A epoxy resin to the dicyclopentadiene epoxy resin is 2-3:1.

[0011] Preferably, the bisphenol A epoxy resin is bisphenol A epoxy resin CYD-115; the dicyclopentadiene epoxy resin is dicyclopentadiene epoxy resin TT100.

[0012] By adopting the above technical scheme, the epoxy resin is selected as a mixture of bisphenol A epoxy resin and dicyclopentadiene epoxy resin, and the mass ratio and specific selection of bisphenol A epoxy resin and dicyclopentadiene epoxy resin are controlled. On the one hand, the compatibility between the epoxy resin mixture and the nylon main material and reinforcing filler can be improved, the high regularity of the nylon molecular chain can be reduced, and the cross-linking density of the final nylon resin can be improved, thereby improving the adhesion between the final nylon resin and the substrate; on the other hand, the composite use of the two can further reduce the hygroscopicity of the final nylon resin, thereby improving the mixing uniformity and fluidity of the nylon resin.

[0013] Preferably, the reinforcing filler comprises carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of the carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2-0.3.

[0014] Preferably, the carbon fiber has a diameter of 12-15 μm and a length of 200-220 μm; the boron nitride fiber has a diameter of 6-8 μm and a length of 170-180 μm; and the aramid pulp has a diameter of 1-3 μm and a length of 100-120 μm.

[0015] By adopting the above technical scheme, the aramid pulp is non-brittle and has a large specific surface area. It can be well combined with carbon fiber and boron nitride fiber, improving the problem that carbon fiber is easy to break and has weak impact resistance, and at the same time fills the surface defects of boron nitride fiber. By controlling the mixing mass ratio and specifications of carbon fiber, boron nitride fiber and aramid pulp, the aramid pulp can be better combined with carbon fiber and boron nitride fiber. The obtained reinforcing filler has high strength, high hardness, high temperature resistance and corrosion resistance. It is used for nylon resin reinforcement with a small dosage and good reinforcement effect, and will not cause the performance of nylon resin to decline.

[0016] Preferably, the vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0017] By adopting the above technical scheme, a small amount of low-viscosity vinyl silicone oil is added to the formula. On the one hand, it can significantly improve the lubricity and wear resistance of the nylon resin and reduce the friction coefficient and wear rate while ensuring appropriate adhesion between the final nylon resin and the substrate; on the other hand, the low-viscosity vinyl silicone oil can form a continuous and stable three-dimensional network structure on the surface of the reinforcing filler, effectively improve the agglomeration problem of the reinforcing filler in the nylon resin, improve the dispersion stability of the reinforcing filler, and then improve the strength and wear resistance of the nylon resin.

[0018] In a second aspect, the present application provides a method for preparing a high-strength nylon resin, using the following technical solution:

[0019] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0020] S1. Weigh the nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant and ultraviolet stabilizer according to weight for later use;

[0021] S2, grinding and mixing the reinforcing filler and vinyl silicone oil to obtain a pretreated filler;

[0022] S3, adding the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and ultraviolet stabilizer into a high-speed mixer, stirring and mixing evenly, and then extruding and granulating to obtain the desired high-strength nylon resin.

[0023] Preferably, in step S2, the grinding pressure is 0.25-0.35 MPa, the grinding speed is 800-1000 r / min, and the grinding time is 1-2 h.

[0024] Preferably, the extrusion granulation in step S3 refers to: using a twin-screw extruder, controlling the aspect ratio of the twin-screw extruder to be 32-38:1, the barrel temperature to be 210-250° C., and the screw speed to be 260-280 r / min.

[0025] Preferably, the high-strength nylon resin obtained in step S3 can be used for coating spraying after freeze grinding.

[0026] By adopting the above technical solution, the reinforcing filler is ground and mixed with vinyl silicone oil for modification, and the mixing uniformity of the reinforcing filler and the remaining raw materials is improved. The addition of vinyl silicone oil can also improve the lubricity and fluidity of the nylon resin. The preparation method of the present application is simple, the preparation conditions are mild, and it is suitable for industrial production. The obtained high-strength nylon resin has good processability and can be used for metal substrate spraying after frozen grinding. The spraying effect is good, the efficiency is high, and the adhesion to the metal substrate is strong. It can be widely used in the automotive industry.

[0027] In summary, this application has the following beneficial effects:

[0028] The present application adopts a mixture of carbon fiber, boron nitride fiber and aramid pulp for nylon reinforcement, with a small dosage, good reinforcement effect, and will not cause the performance of nylon resin to decrease. The obtained nylon resin has high strength, good fluidity and good processability.

[0029] The present application adds an epoxy resin that has good compatibility with the nylon main material and low hygroscopicity, thereby improving the hygroscopicity of the nylon main material and improving the surface bonding force between the nylon main material and the reinforcing filler, thereby improving the adhesion between the final nylon resin and the substrate; the epoxy resin is selected from a mixture of bisphenol A epoxy resin and dicyclopentadiene epoxy resin, and the mass ratio and epoxy equivalent of the bisphenol A epoxy resin and the dicyclopentadiene epoxy resin are controlled within the above range. On the one hand, the compatibility between the epoxy resin mixture and the nylon main material and the reinforcing filler can be improved, the high regularity of the nylon molecular chain can be reduced, the cross-linking density of the final nylon resin can be improved, and then the adhesion between the final nylon resin and the substrate can be improved; on the other hand, the composite use of the two can further reduce the moisture absorption rate of the final nylon resin, thereby improving the mixing uniformity and fluidity of the nylon resin.

[0030] The present application adds a small amount of low-viscosity vinyl silicone oil to the formula. On the one hand, it can significantly improve the lubricity and wear resistance of the nylon resin and reduce the friction coefficient and wear rate while ensuring appropriate adhesion between the final nylon resin and the substrate; on the other hand, the low-viscosity vinyl silicone oil can form a continuous and stable three-dimensional network structure on the surface of the reinforcing filler, and effectively improve the agglomeration problem of the reinforcing filler in the nylon resin, improve the dispersion stability of the reinforcing filler, and thereby improve the strength and wear resistance of the nylon resin. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the examples. In the examples, the curing agent is polyamide curing agent 650, the antioxidant is a compound of antioxidant 1076 and antioxidant 168 in a mass ratio of 2:1; and the ultraviolet stabilizer is 2,4-dihydroxybenzophenone.

[0032] Embodiment 1-8 provides a high-strength nylon resin and a preparation method thereof.

[0033] Example 1

[0034] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0035] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0036] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0037] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0038] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0039] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0040] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0041] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0042] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0043] Example 2

[0044] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 10Kg of epoxy resin, 16Kg of reinforcing filler, 4Kg of vinyl silicone oil, 6Kg of curing agent, 0.3Kg of antioxidant, and 0.2Kg of ultraviolet stabilizer;

[0045] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0046] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0047] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0048] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0049] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0050] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0051] S2, controlling the grinding pressure to 0.3 MPa, the grinding speed to 900 r / min, and the grinding time to 1.5 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0052] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 35:1, the barrel temperature to 230°C, the screw speed to 270r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0053] Example 3

[0054] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 12Kg of epoxy resin, 18Kg of reinforcing filler, 5Kg of vinyl silicone oil, 8Kg of curing agent, 0.5Kg of antioxidant, and 0.3Kg of ultraviolet stabilizer;

[0055] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0056] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0057] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0058] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0059] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0060] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0061] S2, controlling the grinding pressure to 0.35 MPa, the grinding speed to 1000 r / min, and the grinding time to 1 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0062] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 38:1, the barrel temperature to 250°C, the screw speed to 280r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0063] Example 4

[0064] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 10Kg of epoxy resin, 16Kg of reinforcing filler, 4Kg of vinyl silicone oil, 6Kg of curing agent, 0.3Kg of antioxidant, and 0.2Kg of ultraviolet stabilizer;

[0065] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:2;

[0066] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0067] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0068] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0069] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0070] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0071] S2, controlling the grinding pressure to 0.3 MPa, the grinding speed to 900 r / min, and the grinding time to 1.5 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0072] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 35:1, the barrel temperature to 230°C, the screw speed to 270r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0073] Example 5

[0074] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 10Kg of epoxy resin, 16Kg of reinforcing filler, 4Kg of vinyl silicone oil, 6Kg of curing agent, 0.3Kg of antioxidant, and 0.2Kg of ultraviolet stabilizer;

[0075] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 4:2;

[0076] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0077] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0078] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0079] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0080] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0081] S2, controlling the grinding pressure to 0.3 MPa, the grinding speed to 900 r / min, and the grinding time to 1.5 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0082] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 35:1, the barrel temperature to 230°C, the screw speed to 270r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0083] Example 6

[0084] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 10Kg of epoxy resin, 16Kg of reinforcing filler, 4Kg of vinyl silicone oil, 6Kg of curing agent, 0.3Kg of antioxidant, and 0.2Kg of ultraviolet stabilizer;

[0085] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 2:1;

[0086] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0087] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0088] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0089] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0090] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0091] S2, controlling the grinding pressure to 0.3 MPa, the grinding speed to 900 r / min, and the grinding time to 1.5 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0092] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 35:1, the barrel temperature to 230°C, the screw speed to 270r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0093] Example 7

[0094] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 10Kg of epoxy resin, 16Kg of reinforcing filler, 4Kg of vinyl silicone oil, 6Kg of curing agent, 0.3Kg of antioxidant, and 0.2Kg of ultraviolet stabilizer;

[0095] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0096] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 3:1;

[0097] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0098] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0099] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0100] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0101] S2, controlling the grinding pressure to 0.3 MPa, the grinding speed to 900 r / min, and the grinding time to 1.5 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0102] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 35:1, the barrel temperature to 230°C, the screw speed to 270r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0103] Example 8

[0104] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 10Kg of epoxy resin, 16Kg of reinforcing filler, 4Kg of vinyl silicone oil, 6Kg of curing agent, 0.3Kg of antioxidant, and 0.2Kg of ultraviolet stabilizer;

[0105] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0106] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0107] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.3; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0108] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0109] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0110] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0111] S2, controlling the grinding pressure to 0.3 MPa, the grinding speed to 900 r / min, and the grinding time to 1.5 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0112] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 35:1, the barrel temperature to 230°C, the screw speed to 270r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0113] In order to verify the comprehensive performance of the high-strength nylon resin prepared in Examples 1-8 of the present application, the applicant set up Comparative Examples 1-14, which are as follows:

[0114] Comparative Example 1

[0115] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0116] Among them, the main material of nylon is PA66;

[0117] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0118] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0119] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0120] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0121] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0122] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0123] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0124] Comparative Example 2

[0125] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0126] Among them, the main material of nylon is PA612;

[0127] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0128] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0129] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0130] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0131] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0132] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0133] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0134] Comparative Example 3

[0135] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0136] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0137] The epoxy resin includes epoxy resin 0161 (E-54) with an epoxy equivalent of 175-185 g / eq; dicyclopentadiene epoxy resin TT100 with an epoxy equivalent of 250-270 g / eq; and the mass ratio of epoxy resin 0161 (E-54) to dicyclopentadiene epoxy resin TT100 is 2:1;

[0138] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0139] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0140] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0141] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0142] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0143] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0144] Comparative Example 4

[0145] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0146] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0147] The epoxy resin is bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194g / eq;

[0148] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0149] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0150] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0151] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0152] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0153] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0154] Comparative Example 5

[0155] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0156] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0157] The epoxy resin is dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270g / eq;

[0158] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0159] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0160] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0161] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0162] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0163] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0164] Comparative Example 6

[0165] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0166] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0167] The epoxy resin used is epoxy resin 0161 (E-54), and the epoxy equivalent is 175-185g / eq;

[0168] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0169] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0170] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0171] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0172] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0173] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0174] Comparative Example 7

[0175] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0176] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0177] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0178] The reinforcing filler includes carbon fiber and boron nitride fiber, and the mass ratio of carbon fiber to boron nitride fiber is 1:1; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm;

[0179] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0180] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0181] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0182] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0183] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0184] Comparative Example 8

[0185] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0186] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0187] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0188] The reinforcing filler includes carbon fiber and aramid pulp, and the mass ratio of carbon fiber to aramid pulp is 2:0.2; the carbon fiber includes carbon fiber with a diameter of 12-15 μm and a length of 200-220 μm and carbon fiber with a diameter of 6-8 μm and a length of 170-180 μm in a mass ratio of 1:1; the aramid pulp has a diameter of 1-3 μm and a length of 100-120 μm;

[0189] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0190] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0191] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0192] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0193] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0194] Comparative Example 9

[0195] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0196] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0197] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0198] The reinforcing filler includes boron nitride fiber and aramid pulp, and the mass ratio of the boron nitride fiber to the aramid pulp is 2:0.2; the boron nitride fiber includes boron nitride fiber with a diameter of 12-15 μm and a length of 200-220 μm and boron nitride fiber with a diameter of 6-8 μm and a length of 170-180 μm in a mass ratio of 1:1; the aramid pulp has a diameter of 1-3 μm and a length of 100-120 μm;

[0199] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0200] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0201] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0202] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0203] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0204] Comparative Example 10

[0205] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0206] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0207] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0208] The reinforcing filler includes glass fiber and aramid pulp, and the mass ratio of the glass fiber to the aramid pulp is 2:0.2; the glass fiber includes glass fiber with a diameter of 12-15 μm and a length of 200-220 μm and glass fiber with a diameter of 6-8 μm and a length of 170-180 μm in a mass ratio of 1:1; the aramid pulp has a diameter of 1-3 μm and a length of 100-120 μm;

[0209] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0210] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0211] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0212] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0213] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0214] Comparative Example 11

[0215] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 8Kg of epoxy resin, 14Kg of reinforcing filler, 3Kg of vinyl silicone oil, 4Kg of curing agent, 0.1Kg of antioxidant, and 0.1Kg of ultraviolet stabilizer;

[0216] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0217] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0218] The reinforcing filler includes glass fibers with a diameter of 12-15 μm and a length of 200-220 μm and glass fibers with a diameter of 6-8 μm and a length of 170-180 μm in a mass ratio of 1:1;

[0219] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0220] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0221] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0222] S2, controlling the grinding pressure to 0.25 MPa, the grinding speed to 800 r / min, and the grinding time to 2 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0223] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 32:1, the barrel temperature to 210°C, the screw speed to 260r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0224] Comparative Example 12

[0225] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 10Kg of epoxy resin, 16Kg of reinforcing filler, 4Kg of vinyl silicone oil, 6Kg of curing agent, 0.3Kg of antioxidant, and 0.2Kg of ultraviolet stabilizer;

[0226] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0227] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0228] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameters of carbon fiber and boron nitride fiber are both 6-8 μm and the lengths are both 170-180 μm; the diameter of aramid pulp is 1-3 μm and the length is 100-120 μm;

[0229] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0230] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0231] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0232] S2, controlling the grinding pressure to 0.3 MPa, the grinding speed to 900 r / min, and the grinding time to 1.5 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0233] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 35:1, the barrel temperature to 230°C, the screw speed to 270r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0234] Comparative Example 13

[0235] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 10Kg of epoxy resin, 16Kg of reinforcing filler, 4Kg of vinyl silicone oil, 6Kg of curing agent, 0.3Kg of antioxidant, and 0.2Kg of ultraviolet stabilizer;

[0236] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0237] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0238] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0239] The vinyl silicone oil is vinyl silicone oil RH-Vi325.

[0240] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0241] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0242] S2, controlling the grinding pressure to 0.3 MPa, the grinding speed to 900 r / min, and the grinding time to 1.5 h, grinding and mixing the reinforcing filler and the vinyl silicone oil to obtain a pretreated filler;

[0243] S3. Add the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 35:1, the barrel temperature to 230°C, the screw speed to 270r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0244] Comparative Example 14

[0245] A high-strength nylon resin, including raw materials: 100Kg of nylon main material, 10Kg of epoxy resin, 16Kg of reinforcing filler, 4Kg of vinyl silicone oil, 6Kg of curing agent, 0.3Kg of antioxidant, and 0.2Kg of ultraviolet stabilizer;

[0246] Wherein, the main nylon material includes PA66 and PA612, and the mass ratio of PA66 to PA612 is 3:1;

[0247] The epoxy resin includes bisphenol A epoxy resin CYD-115, with an epoxy equivalent of 180-194 g / eq; dicyclopentadiene epoxy resin TT100, with an epoxy equivalent of 250-270 g / eq; and the mass ratio of bisphenol A epoxy resin CYD-115 to dicyclopentadiene epoxy resin TT100 is 2:1;

[0248] The reinforcing filler includes carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2; the diameter of carbon fiber is 12-15 μm, and the length is 200-220 μm; the diameter of boron nitride fiber is 6-8 μm, and the length is 170-180 μm; the diameter of aramid pulp is 1-3 μm, and the length is 100-120 μm;

[0249] The vinyl silicone oil is vinyl silicone oil RH-Vi395.

[0250] A method for preparing a high-strength nylon resin comprises the following preparation steps:

[0251] S1. Weigh nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant, and ultraviolet stabilizer for later use;

[0252] S2, controlling the grinding pressure to 0.3 MPa, the grinding speed to 900 r / min, and the grinding time to 1.5 h, and grinding the reinforcing filler to obtain the pretreated filler;

[0253] S3. Add the pretreated filler, nylon main material, epoxy resin, vinyl silicone oil, curing agent, antioxidant and UV stabilizer into a high-speed mixer, stir and mix at a speed of 1200r / min for 30 minutes. After stirring and mixing evenly, use a twin-screw extruder, control the aspect ratio of the twin-screw extruder to 35:1, the barrel temperature to 230°C, the screw speed to 270r / min, extrude and granulate to obtain the required high-strength nylon resin.

[0254] Performance Testing

[0255] The high-strength nylon resins prepared in Examples 1-8 and Comparative Examples 1-14 of the present application were respectively frozen to -100°C by liquid nitrogen, kept frozen for 30 minutes, and then titanium dioxide R-706 (the mass ratio of high-strength nylon resin to titanium dioxide R-706 was 150:1) was added, ground and sieved by a cryogenic grinding machine, and dried to a moisture content of ≤0.1% to obtain D 50 Nylon powder coating with a particle size of 30 μm;

[0256] The nylon powder coating was evenly sprayed on a steel plate with a thickness of 0.5 mm by an electrostatic spraying method, and heated and cured at 200° C. for 15 minutes to obtain a coating with a thickness of 80 μm.

[0257] Test the fluidity of nylon powder coating according to standard GB / T1482-2010;

[0258] Calculate the moisture absorption rate of nylon powder coating after storage for 24 hours at a temperature of 23°C and a relative humidity of 50% (the calculation method is: Wherein, m1 is the weight of the product when dry, and m2 is the weight of the product after storage for 24 hours);

[0259] Test the impact resistance of the coating according to standard GB / T 1732-2020;

[0260] Test the pencil hardness of the coating according to standard ISO 15184-2020;

[0261] Test the bendability of the coating according to standard GB / T 6742-2007;

[0262] Test the adhesion of the coating according to standard GB / T 9286-2021;

[0263] The test results of various performances are shown in Table 1.

[0264] Table 1:

[0265]

[0266]

[0267] It can be seen from the data shown in Table 1 above that the comprehensive performance of the high-strength nylon resin prepared in Examples 1-8 of the present application is significantly improved compared with that in Comparative Examples 1-14, indicating that under the preferred raw material ratio and process limitations of the present application, the raw materials in the formula can interact with each other and synergize to improve the comprehensive performance of the final nylon resin.

[0268] By comparing Example 1 and Comparative Examples 1-2, it can be seen that the nylon main material is a mixture of PA66 and PA612, and the mixing mass ratio is limited. Compared with the use of PA66 or PA612 as the main material alone, it can significantly interact with other raw materials, thereby significantly improving the comprehensive performance of the final nylon resin.

[0269] By comparing Example 1 with Comparative Examples 3-6, it can be seen that: the epoxy resin is selected from bisphenol A epoxy resin CYD-115 and dicyclopentadiene epoxy resin TT100, and controlling the compounding ratio of the two can significantly improve the comprehensive performance of the final nylon resin compared with selecting bisphenol A epoxy resin CYD-115 or dicyclopentadiene epoxy resin TT100 alone.

[0270] By comparing Example 1 with Comparative Examples 7-12, it can be seen that the reinforcing fillers are carbon fiber, boron nitride fiber and aramid pulp. By controlling the mixing mass ratio and specifications of carbon fiber, boron nitride fiber and aramid pulp, a small amount of addition and a significant reinforcing effect can be achieved.

[0271] By comparing Example 1 and Comparative Example 13, it can be seen that the use of low-viscosity vinyl silicone oil RH-Vi395 as the vinyl silicone oil can further enhance the comprehensive properties of the final nylon resin compared to the use of conventional vinyl silicone oil RH-Vi325.

[0272] By comparing Example 1 and Comparative Example 14, it can be seen that the reinforcing filler is ground and mixed with vinyl silicone oil in advance to form a continuous and stable three-dimensional network structure on the surface of the reinforcing filler, which effectively improves the agglomeration problem of the reinforcing filler in the nylon resin, improves the dispersion stability of the reinforcing filler, and thus significantly improves the comprehensive performance of the final nylon resin.

[0273] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A high-strength nylon resin, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of nylon main material, 8-12 parts of epoxy resin, 14-18 parts of reinforcing filler, 3-5 parts of vinyl silicone oil, 4-8 parts of curing agent, 0.1-0.5 parts of antioxidant, and 0.1-0.3 parts of ultraviolet stabilizer; The main nylon material includes PA66 and PA612; the mass ratio of PA66 to PA612 is 3-4:1-2; The epoxy resin comprises bisphenol A epoxy resin and dicyclopentadiene epoxy resin, and the mass ratio of the bisphenol A epoxy resin to the dicyclopentadiene epoxy resin is 2-3:1; The bisphenol A epoxy resin is bisphenol A epoxy resin CYD-115; the dicyclopentadiene epoxy resin is dicyclopentadiene epoxy resin TT100; The reinforcing filler comprises carbon fiber, boron nitride fiber and aramid pulp, and the mass ratio of the carbon fiber, boron nitride fiber and aramid pulp is 1:1:0.2-0.

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2. The high-strength nylon resin according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of nylon main material, 10 parts of epoxy resin, 16 parts of reinforcing filler, 4 parts of vinyl silicone oil, 6 parts of curing agent, 0.3 parts of antioxidant and 0.2 parts of ultraviolet stabilizer.

3. The high-strength nylon resin according to claim 1, characterized in that: The carbon fiber has a diameter of 12-15 μm and a length of 200-220 μm; the boron nitride fiber has a diameter of 6-8 μm and a length of 170-180 μm; and the aramid pulp has a diameter of 1-3 μm and a length of 100-120 μm.

4. The high-strength nylon resin according to claim 1, characterized in that: The vinyl silicone oil is vinyl silicone oil RH-Vi395.

5. A method for preparing the high-strength nylon resin according to any one of claims 1 to 4, characterized in that: The method comprises the following preparation steps: S1. Weigh the nylon main material, epoxy resin, reinforcing filler, vinyl silicone oil, curing agent, antioxidant and ultraviolet stabilizer according to weight for later use; S2, grinding and mixing the reinforcing filler and vinyl silicone oil to obtain a pretreated filler; S3, adding the pretreated filler, nylon main material, epoxy resin, curing agent, antioxidant and ultraviolet stabilizer into a high-speed mixer, stirring and mixing evenly, and then extruding and granulating to obtain the desired high-strength nylon resin.

6. The method for preparing the high-strength nylon resin according to claim 5, characterized in that: The high-strength nylon resin obtained in step S3 can be used for coating spraying after being frozen and ground.

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