Piston material for new energy vehicle brake caliper and preparation method thereof

Abstract

The present invention discloses a piston material for a new energy vehicle brake caliper and a preparation method thereof, which belongs to the field of piston material technology, including the following raw materials in parts by weight: 10-20 parts of phenolic resin, 3-8 parts of modified reinforcing filler, 30-50 parts of filler, and 1-2.5 parts of auxiliary agent; each raw material is added to a mixer, mixed evenly to obtain a mixture, which is then sent to a twin-screw extruder for mixing, extruded and granulated to obtain a piston material for a new energy vehicle brake caliper. When the modified reinforcing filler is added to the matrix, the toughening effect of glass fiber can be exerted on the one hand, and the maleimide and residual amino groups introduced on the other hand can also participate in the curing of the phenolic resin, and the heat-resistant structure introduced can also ensure that the system is cured at high temperatures.

Description

Technical Field

[0001] The present invention relates to the technical field of piston materials, and in particular to a piston material for a new energy vehicle brake caliper and a preparation method thereof. Background Art

[0002] Caliper pistons, automotive components, are molded from phenolic molding compounds. The basic requirements for these phenolic molding compounds are high mechanical strength, heat resistance, chemical resistance, and dimensional stability. Caliper pistons are primarily used for braking and are an integral part of the vehicle's braking system.

[0003] To achieve these performance requirements, the typical approach is to use linear phenolic resin as a binder, glass fiber as a reinforcement, and silicone rubber as a toughening agent. The phenolic resin accounts for approximately 35%, the glass fiber for approximately 40%, the mineral filler for approximately 30%, and other additives and curing agents for approximately 10%. Traditional compounding makes material production and processing difficult, with the glass fiber in the molding compound particles easily exposed and pilling, complicating subsequent processing and resulting in poor performance.

[0004] Due to the increasingly stringent requirements for high mechanical strength, heat resistance and dimensional stability of materials, inorganic fibers are becoming more and more common as reinforcing and heat-resistant materials. Although inorganic fiber materials have been found, the amount added still cannot meet these performance requirements. Secondly, the domestic production process basically uses the most traditional mixing process, which cannot completely melt and knead the fibers.

[0005] Therefore, there is an urgent need for a phenolic molding compound for molding automobile caliper pistons and a preparation method thereof, the performance of which has been greatly improved, and which can be processed by melt kneading while meeting environmental friendliness. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a piston material for a new energy vehicle brake caliper and a preparation method thereof.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A piston material for a new energy vehicle brake caliper comprises the following raw materials in parts by weight: 10-20 parts of phenolic resin, 3-8 parts of modified reinforcing filler, 30-50 parts of filler, and 1-2.5 parts of additive;

[0009] The modified reinforcing filler is prepared by the following steps:

[0010] Step S1, adding N-p-hydroxyphenylmaleamic acid to toluene, adding p-toluenesulfonic acid and N,N-dimethylformamide, heating to 100-110°C, keeping the temperature to react for 2-4 hours, pouring into deionized water after the reaction, cooling and crystallizing, filtering, and vacuum drying at 65-75°C to obtain an intermediate;

[0011] In step S1, p-toluenesulfonic acid is used as a catalyst to dehydrate and ring-close N-p-hydroxyphenylmaleamic acid to prepare an intermediate;

[0012] Step S2, adding 4,4'-diphenyl dimethyl ether and the intermediate into a three-necked flask, adding p-toluenesulfonic acid, heating to 100-110°C, keeping warm and reacting for 4-6 hours, cooling to room temperature after the reaction, washing with hot ethanol five times, and then vacuum drying at 50-65°C for 6-8 hours to obtain a modifier;

[0013] In step S2, p-toluenesulfonic acid is used as a catalyst to react 4,4'-diphenyl dimethyl ether with the intermediate to prepare a modifier having both a biphenyl structure and a maleimide structure, both of which are heat-resistant structures.

[0014] Step S3: adding the modified glass fiber and the modifier into N,N-dimethylformamide, heating to 60-65° C., stirring at a constant speed and reacting for 4-6 hours, and obtaining a modified reinforced filler after the reaction is completed.

[0015] In step S3, the maleic anhydride on the modifier reacts with the amino group on the modified glass fiber, and the modifier structure is connected to the surface of the glass fiber. When the modified reinforcing filler is added to the matrix, on the one hand, it can exert the toughening effect of the glass fiber. On the other hand, the introduced maleimide and the remaining amino group can also participate in the curing of the phenolic resin. The introduced heat-resistant structure can also ensure the curing effect of the system at high temperature.

[0016] Furthermore, the filler is wollastonite.

[0017] Furthermore, the auxiliary agent is a mixture of a release agent, a colorant and an active agent in a weight ratio of 1:5:1.

[0018] Furthermore, the release agent is zinc stearate, the colorant is carbon black, and the active agent is silane.

[0019] Furthermore, in step S1, the dosage ratio of N-p-hydroxyphenylmaleamic acid, p-toluenesulfonic acid, N,N-dimethylformamide and deionized water is controlled to be 7.5-8.0 g: 0.8-1.2 g: 3-4 mL: 15-20 mL.

[0020] Furthermore, in step S2, the usage ratio of 4,4'-diphenyl dimethyl ether, the intermediate and p-toluenesulfonic acid is controlled to be 2-4 g: 5-6 g: 0.03-0.05 g.

[0021] Furthermore, in step S3, the dosage ratio of the modified glass fiber, the modifier and N,N-dimethylformamide is controlled to be 10-12 g: 3-5 g: 20-25 mL.

[0022] A method for preparing a piston material for a new energy vehicle brake caliper comprises the following steps:

[0023] The raw materials are added into a mixer and mixed evenly to obtain a mixture, which is then sent into a twin-screw extruder for mixing and extrusion granulation to obtain a piston material for a new energy vehicle brake caliper.

[0024] Beneficial effects of the present invention:

[0025] The present invention prepares a piston material for a new energy vehicle brake caliper, using a phenolic resin as a matrix and a modified reinforcing filler as the reinforcing filler. During the preparation process of the reinforcing filler, p-toluenesulfonic acid is first used as a catalyst to dehydrate and ring-close N-p-hydroxyphenylmaleamic acid to prepare an intermediate. Then, 4,4'-biphenyl dimethyl ether reacts with the intermediate to prepare a modifier. The modifier has both a biphenyl structure and a maleimide structure, both of which are heat-resistant structures. Finally, the maleic anhydride on the modifier reacts with the amino group on the modified glass fiber to connect the modifier structure to the surface of the glass fiber. When the modified reinforcing filler is added to the matrix, on the one hand, it can exert a toughening effect on the glass fiber. On the other hand, the introduced maleimide and the remaining amino group can also participate in the curing of the phenolic resin. The introduced heat-resistant structure can also ensure the curing effect of the system at high temperature. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0027] Example 1: A piston material for a new energy vehicle brake caliper comprises the following raw materials in parts by weight: 10 parts of phenolic resin (S604A-1-2 / S604A-1-3), 3 parts of modified reinforcing filler, 30 parts of filler, and 1 part of auxiliary agent;

[0028] A method for preparing a piston material for a new energy vehicle brake caliper comprises the following steps:

[0029] The raw materials are added into a mixer and mixed evenly to obtain a mixture, which is then sent into a twin-screw extruder for mixing and extrusion granulation to obtain a piston material for a new energy vehicle brake caliper.

[0030] The modified reinforcing filler is prepared by the following steps:

[0031] Step S1, adding N-p-hydroxyphenylmaleamic acid to toluene, adding p-toluenesulfonic acid and N,N-dimethylformamide, heating to 100°C, keeping the temperature for reaction for 2 hours, pouring into deionized water after the reaction is completed, cooling and crystallizing, filtering, and vacuum drying at 65°C to obtain an intermediate, wherein the amount ratio of N-p-hydroxyphenylmaleamic acid, p-toluenesulfonic acid, N,N-dimethylformamide and deionized water is controlled to be 7.5g:0.8g:3mL:15mL;

[0032] Step S2, adding 4,4'-biphenyl dimethyl ether and the intermediate into a three-necked flask, adding p-toluenesulfonic acid, heating to 100°C, keeping warm and reacting for 4 hours, cooling to room temperature after the reaction, washing five times with hot ethanol, and then vacuum drying at 50°C for 6 hours to prepare a modifier, and controlling the amount ratio of 4,4'-biphenyl dimethyl ether, the intermediate and p-toluenesulfonic acid to be 2g: in step S3, controlling the amount ratio of the modified glass fiber, the modifier and N,N-dimethylformamide to be 10g:3g:20mL;

[0033] Step S3, adding the modified glass fiber and the modifier to N,N-dimethylformamide, heating to 60°C, stirring at a uniform speed and reacting for 4 hours, and obtaining a modified reinforcing filler after the reaction is completed. The amount ratio of the modified glass fiber, the modifier and the N,N-dimethylformamide is controlled to be 10g:3g:20mL.

[0034] The filler is wollastonite.

[0035] The auxiliary agent is a mixture of a release agent, a colorant and an active agent in a weight ratio of 1:5:1.

[0036] The release agent is zinc stearate, the colorant is carbon black, and the active agent is silane (model SCA1113).

[0037] The modified glass fiber is a glass fiber modified with silane coupling agent KH550.

[0038] Example 2: A piston material for a new energy vehicle brake caliper, comprising the following raw materials in parts by weight: 15 parts of phenolic resin (S604A-1-2 / S604A-1-3), 5 parts of modified reinforcing filler, 40 parts of filler, and 1.5 parts of additive;

[0039] A method for preparing a piston material for a new energy vehicle brake caliper comprises the following steps:

[0040] The raw materials are added into a mixer and mixed evenly to obtain a mixture, which is then sent into a twin-screw extruder for mixing and extrusion granulation to obtain a piston material for a new energy vehicle brake caliper.

[0041] The modified reinforcing filler is prepared by the following steps:

[0042] Step S1, adding N-p-hydroxyphenylmaleamic acid to toluene, adding p-toluenesulfonic acid and N,N-dimethylformamide, heating to 100°C, keeping the temperature for reaction for 3 hours, pouring into deionized water after the reaction is completed, cooling and crystallizing, filtering, and vacuum drying at 70°C to obtain an intermediate, wherein the amount ratio of N-p-hydroxyphenylmaleamic acid, p-toluenesulfonic acid, N,N-dimethylformamide and deionized water is controlled to be 7.8g:1g:3mL:20mL;

[0043] Step S2, adding 4,4'-biphenyl dimethyl ether and the intermediate into a three-necked flask, adding p-toluenesulfonic acid, heating to 110°C, keeping warm and reacting for 5 hours, cooling to room temperature after the reaction, washing five times with hot ethanol, and then vacuum drying at 60°C for 8 hours to prepare a modifier, and controlling the amount ratio of 4,4'-biphenyl dimethyl ether, the intermediate and p-toluenesulfonic acid to be 2.5 g: in step S3, controlling the amount ratio of the modified glass fiber, the modifier and N,N-dimethylformamide to be 11 g:4 g:20 mL;

[0044] Step S3: Add the modified glass fiber and the modifier to N,N-dimethylformamide, raise the temperature to 60°C, stir at a constant speed and react for 4-6 hours. After the reaction is completed, a modified reinforcing filler is obtained. The amount ratio of the modified glass fiber, the modifier and the N,N-dimethylformamide is controlled to be 12g:4g:24mL.

[0045] The filler is wollastonite.

[0046] The auxiliary agent is a mixture of a release agent, a colorant and an active agent in a weight ratio of 1:5:1.

[0047] The release agent is zinc stearate, the colorant is carbon black, and the active agent is silane (model SCA1113).

[0048] The modified glass fiber is a glass fiber modified with silane coupling agent KH550.

[0049] Example 3: A piston material for a new energy vehicle brake caliper, comprising the following raw materials in parts by weight: 20 parts of phenolic resin (S604A-1-2 / S604A-1-3), 8 parts of modified reinforcing filler, 50 parts of filler, and 2.5 parts of additives;

[0050] A method for preparing a piston material for a new energy vehicle brake caliper comprises the following steps:

[0051] The raw materials are added into a mixer and mixed evenly to obtain a mixture, which is then sent into a twin-screw extruder for mixing and extrusion granulation to obtain a piston material for a new energy vehicle brake caliper.

[0052] The modified reinforcing filler is prepared by the following steps:

[0053] Step S1, adding N-p-hydroxyphenylmaleamic acid to toluene, adding p-toluenesulfonic acid and N,N-dimethylformamide, heating to 110°C, keeping the temperature for reaction for 4 hours, pouring into deionized water after the reaction, cooling and crystallizing, filtering, and vacuum drying at 75°C to obtain an intermediate, wherein the amount ratio of N-p-hydroxyphenylmaleamic acid, p-toluenesulfonic acid, N,N-dimethylformamide and deionized water is controlled to be 8.0g:1.2g:4mL:20mL;

[0054] Step S2, adding 4,4'-biphenyl dimethyl ether and the intermediate into a three-necked flask, adding p-toluenesulfonic acid, heating to 110°C, keeping warm and reacting for 6 hours, cooling to room temperature after the reaction, washing five times with hot ethanol, and then vacuum drying at 65°C for 8 hours to prepare a modifier, and controlling the amount ratio of 4,4'-biphenyl dimethyl ether, the intermediate and p-toluenesulfonic acid to be 4g: in step S3, controlling the amount ratio of the modified glass fiber, the modifier and N,N-dimethylformamide to be 12g:5g:25mL;

[0055] Step S3: Add the modified glass fiber and the modifier to N,N-dimethylformamide, raise the temperature to 65°C, stir at a constant speed and react for 6 hours. After the reaction is completed, a modified reinforcing filler is obtained. The amount ratio of the modified glass fiber, the modifier and the N,N-dimethylformamide is controlled to be 12g:5g:25mL.

[0056] The filler is wollastonite.

[0057] The auxiliary agent is a mixture of a release agent, a colorant and an active agent in a weight ratio of 1:5:1.

[0058] The release agent is zinc stearate, the colorant is carbon black, and the active agent is silane (model SCA1113).

[0059] The modified glass fiber is a glass fiber modified with silane coupling agent KH550.

[0060] Comparative Example 1: Compared with Example 1, this comparative example uses commercially available glass fiber instead of the modified reinforcing filler of the present invention, and the rest is the same as Example 1.

[0061] The properties of the piston materials prepared in Examples 1 to 3 and Comparative Example 1 were tested, and the results are shown in Table 1 below:

[0062] Tensile strength: in accordance with GB / T1040.2-2006 standard;

[0063] Elongation at break: in accordance with GB / T1040.2-2006 standard;

[0064] Friction coefficient: in accordance with GB / T 3960-2016 standard;

[0065] Volume wear rate: carried out in accordance with GB / T 3960-2016 standard.

[0066] Table 1

[0067] Tensile strength MPa Friction coefficient <![CDATA[Volume wear rate X 10 -7 mm 3 / N•m]]> Example 1 75 0.12 1.2 Example 2 78 0.14 1.4 Example 3 78 0.15 1.3 Comparative Example 1 62 0.22 2.5

[0068] It can be seen from Table 1 above that the piston materials prepared in Examples 1-3 of the present invention have excellent performance.

[0069] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A piston material for a new energy vehicle brake caliper, characterized in that: The invention comprises the following raw materials in parts by weight: 10-20 parts of phenolic resin, 3-8 parts of modified reinforcing filler, 30-50 parts of filler, and 1-2.5 parts of auxiliary agent; The modified reinforcing filler is prepared by the following steps: Step S1, adding N-p-hydroxyphenylmaleamic acid to toluene, adding p-toluenesulfonic acid and N,N-dimethylformamide, heating to 100-110° C., keeping warm for 2-4 hours, pouring into deionized water after the reaction, cooling and crystallizing, filtering, and vacuum drying to obtain an intermediate; Step S2, adding 4,4'-diphenyl dimethyl ether and the intermediate into a three-necked flask, adding p-toluenesulfonic acid, heating to 100-110°C, keeping warm and reacting for 4-6 hours, cooling to room temperature after the reaction, washing with hot ethanol five times, and then vacuum drying for 6-8 hours to obtain a modifier; Step S3: adding the modified glass fiber and the modifier into N,N-dimethylformamide, heating to 60-65° C., stirring at a constant speed and reacting for 4-6 hours, and obtaining a modified reinforced filler after the reaction is completed.

2. The piston material for a new energy vehicle brake caliper according to claim 1, characterized in that: The filler is wollastonite.

3. The piston material for a new energy vehicle brake caliper according to claim 1, characterized in that: The auxiliary agent is a mixture of a release agent, a colorant and an active agent in a weight ratio of 1:5:

1.

4. The piston material for a new energy vehicle brake caliper according to claim 3, characterized in that: The release agent is zinc stearate, the colorant is carbon black, and the active agent is silane.

5. The piston material for a new energy vehicle brake caliper according to claim 1, characterized in that: In step S1, the dosage ratio of N-p-hydroxyphenylmaleamic acid, p-toluenesulfonic acid, N,N-dimethylformamide and deionized water is controlled to be 7.5-8.0 g: 0.8-1.2 g: 3-4 mL: 15-20 mL.

6. The piston material for a new energy vehicle brake caliper according to claim 1, characterized in that: The vacuum drying temperature in step S1 is 65-75°C.

7. The piston material for a new energy vehicle brake caliper according to claim 1, characterized in that: In step S2, the usage ratio of 4,4'-diphenyl dimethyl ether, the intermediate and p-toluenesulfonic acid is controlled to be 2-4 g: 5-6 g: 0.03-0.05 g.

8. The piston material for a new energy vehicle brake caliper according to claim 1, characterized in that: The vacuum drying temperature in step S2 is 50-65°C.

9. The piston material for a new energy vehicle brake caliper according to claim 1, characterized in that: In step S3, the dosage ratio of the modified glass fiber, the modifier and N,N-dimethylformamide is controlled to be 10-12 g: 3-5 g: 20-25 mL.

10. The method for preparing a piston material for a new energy vehicle brake caliper according to claim 1, characterized in that: The steps include: The raw materials are added into a mixer and mixed evenly to obtain a mixture, which is then sent into a twin-screw extruder for mixing and extrusion granulation to obtain a piston material for a new energy vehicle brake caliper.