High friction performance environmentally friendly brake pads

Abstract

The invention belongs to the field of brake pads, in particular to an environmentally friendly brake pad with high friction performance. Aiming at the problems that the existing automobile brake pads have poor thermal stability and low friction performance, the following scheme is proposed. The brake pad comprises the following raw materials in parts by weight: 30-40 parts of modified short fibers of recycled non-woven fabrics, 10-15 parts of carbon fibers, 20-30 parts of phenolic resins, 5-10 parts of fluororubbers, 10-15 parts of graphite, 5-10 parts of steel fibers, 1-5 parts of aluminum silicate fibers, 10-15 parts of fillers, 5-10 parts of floating beads, 5-10 parts of potassium hexatitanate whiskers, 5-10 parts of calcium sulfate whiskers, 10-15 parts of glass fibers, 1-5 parts of silicone-modified epoxy resins, 2-7 parts of magnesium stearate, 6-12 parts of nano-alumina, 7-15 parts of polyamide fibers and 10-15 parts of wear-resistant carbon black. The brake pad has high friction performance, good thermal stability and a simple preparation method.

Description

Technical Field

[0001] The invention relates to the field of brake pads, and in particular to an environmentally friendly brake pad with high friction performance. Background Art

[0002] Car brake pads, also called car brake leathers, refer to the friction materials fixed on the brake drum or brake disc that rotates with the wheel. The friction lining and friction pads are subjected to external pressure, generating friction to achieve the purpose of decelerating the vehicle.

[0003] In line with the purpose of being an environmentally friendly manufacturer, our company uses non-woven fabric waste as friction materials. However, due to the low heat resistance, low hardness, heat sensitivity and easy creep of polypropylene and polyethylene, single polyethylene material often cannot meet the requirements of special working conditions such as load and high speed. Therefore, it is difficult to recycle resources without reducing the performance of brake pads. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem of resource recycling in the prior art, reduce the material cost of automobile brake pads, and also solve the shortcomings of existing automobile organic fiber brake pads, such as poor thermal stability and low friction performance, and propose a high friction performance environmentally friendly brake pad.

[0005] The high-friction performance environment-friendly brake pad proposed by the present invention comprises the following raw materials in parts by weight: 30-40 parts of modified short fibers from recycled non-woven fabrics, 10-15 parts of carbon fibers, 20-30 parts of phenolic resin, 5-10 parts of fluororubber, 10-15 parts of graphite, 5-10 parts of steel fibers, 1-5 parts of aluminum silicate fibers, 10-15 parts of fillers, 5-10 parts of floating beads, 5-10 parts of potassium hexatitanate whiskers, 5-10 parts of calcium sulfate whiskers, 10-15 parts of glass fibers, 1-5 parts of silicone-modified epoxy resin, 2-7 parts of magnesium stearate, 6-12 parts of nano-alumina, 7-15 parts of polyamide fibers, and 10-15 parts of wear-resistant carbon black; the modified short fibers from recycled non-woven fabrics are 30-40 parts of non-woven fabrics, 10-15 parts of carbon fibers, 10-15 parts of phenolic resin, 5-10 parts of fluororubber, 10-15 parts of graphite, 5-10 parts of steel fibers, 1-5 parts of aluminum silicate fibers, 10-15 parts of fillers, 5-10 parts of floating beads, 5-10 parts of potassium hexatitanate whiskers, 5-10 parts of calcium sulfate whiskers, 10-15 parts of glass fibers, 1-5 parts of organosilicon-modified epoxy resin, 2-7 parts of magnesium stearate, 6-12 parts of nano-alumina, 7-15 parts of polyamide fibers, and 10-15 parts of wear-resistant carbon black; The fiber preparation method is as follows: A. rinse the non-woven product recyclate and dry it; B. send the dried non-woven product recyclate into a crusher and cut it into 30-50 mesh pieces; C. send 20-30 parts of ultra-short glass fiber with a length of 0.15-0.5 mm, 0.5-1 parts of maleic anhydride grafted polypropylene, 0.5-1 parts of polymethylphenylsiloxane, and 0.2-0.5 parts of antioxidant BHT into a high-speed disperser for mixing, and immediately send it into a screw extruder for melting after mixing, and extrude the melt through a spinning box for spinning, quenching, and preparing modified long fibers with a diameter of 0.5-1.0 mm; D. cut the modified long fibers into short fibers to obtain modified short fibers of non-woven product recyclate.

[0006] Preferably, the ultra-short glass fiber has a length of 0.15-0.5 mm.

[0007] Preferably, the glass fiber has a length of 6-10 mm.

[0008] Preferably, the length of the modified short fibers from the recycled non-woven fabric product is 6-10 mm.

[0009] Preferably, the raw materials include the following parts by weight: 32-37 parts of modified short fibers from recycled non-woven products, 11-13 parts of carbon fibers, 21-20 parts of phenolic resin, 6-9 parts of fluororubber, 11-12 parts of graphite, 6-9 parts of steel fibers, 2-3 parts of aluminum silicate fibers, 11-13 parts of fillers, 6-8 parts of floating beads, 6-8 parts of potassium hexatitanate whiskers, 6-8 parts of calcium sulfate whiskers, 11-13 parts of glass fibers, 2-3 parts of silicone-modified epoxy resin, 3-5 parts of magnesium stearate, 9-11 parts of nano-alumina, 8-12 parts of polyamide fibers, and 11-13 parts of wear-resistant carbon black.

[0010] Preferably, the raw materials include the following parts by weight: 35 parts of modified short fibers from recycled non-woven products, 12 parts of carbon fibers, 25 parts of phenolic resin, 7 parts of fluororubber, 12 parts of graphite, 7 parts of steel fibers, 3 parts of aluminum silicate fibers, 12 parts of fillers, 7 parts of floating beads, 7 parts of potassium hexatitanate whiskers, 7 parts of calcium sulfate whiskers, 12 parts of glass fibers, 3 parts of silicone-modified epoxy resin, 4 parts of magnesium stearate, 9 parts of nano-alumina, 10 parts of polyamide fibers, and 12 parts of wear-resistant carbon black.

[0011] The method for preparing a high friction performance environmentally friendly brake pad comprises the following steps:

[0012] S1: Putting modified short fibers of recycled non-woven fabrics, carbon fibers, phenolic resin, fluororubber, graphite, steel fibers, aluminum silicate fibers, and fillers into a mixer and mixing them evenly to obtain a first raw material;

[0013] S2: putting floating beads, potassium hexatitanate whiskers, calcium sulfate whiskers, glass fibers, silicone-modified epoxy resin, magnesium stearate, nano-aluminum oxide, polyamide fibers, and wear-resistant carbon black into a mixer for mixing to obtain a second raw material, and uniformly mixing the second raw material with the first raw material to obtain a third raw material;

[0014] S3: adding the third raw material into the mold, placing it into the forming mold for pressing, and then compounding it with the steel back and placing it into a flat vulcanizer at a high temperature of 350°C and a pressure of 25MPa for 30 minutes to obtain a blank;

[0015] S4: Grinding, heat treating and spraying the blank to produce an environmentally friendly brake pad with high friction performance.

[0016] Preferably, in S1, the modified short fibers of recycled non-woven fabrics, carbon fibers, phenolic resin, fluororubber, graphite, steel fibers, aluminum silicate fibers, and fillers are put into a mixer and mixed evenly at a mixing speed of 300-400 r / min and a mixing time of 20-30 min.

[0017] Preferably, in S2, floating beads, potassium hexatitanate whiskers, calcium sulfate whiskers, glass fibers, silicone-modified epoxy resin, magnesium stearate, nano-alumina, polyamide fibers, and wear-resistant carbon black are placed in a mixer for mixing to obtain a second raw material, and the second raw material is evenly mixed with the first raw material to obtain a third raw material, the mixing speed is 300-400 r / min, and the mixing time is 40-50 min.

[0018] Preferably, in S4, the ground blank is placed in a heat treatment box, the temperature in the treatment box is 120-150° C., and the heat treatment time is 5-7 hours.

[0019] The beneficial effects of the present invention are:

[0020] The main friction material of the present invention is made of recycled non-woven fabrics through reprocessing, and is combined with floating beads, potassium hexatitanate whiskers, and calcium sulfate whiskers as raw materials, and has good thermal stability.

[0021] By using glass fiber, silicone-modified epoxy resin, and magnesium stearate as raw materials, the heat resistance can be improved;

[0022] By using graphite, polyamide fiber, wear-resistant carbon black, steel fiber, and aluminum silicate fiber as raw materials, the wear resistance can be improved and high friction performance can be achieved;

[0023] The present invention reduces plastic and medical waste, reduces the production cost of the product, improves product performance, and has good friction and thermal stability. DETAILED DESCRIPTION

[0024] The present invention will be further explained below in conjunction with specific embodiments.

[0025] Embodiment 1

[0026] The invention provides an environmentally friendly brake pad with high friction performance, which comprises the following raw materials in parts by weight: 30 parts of modified short fibers of recycled non-woven fabrics, 10 parts of carbon fibers, 20 parts of phenolic resin, 5 parts of fluororubber, 10 parts of graphite, 5 parts of steel fibers, 1 part of aluminum silicate fibers, 10 parts of fillers, 5 parts of floating beads, 5 parts of potassium hexatitanate whiskers, 5 parts of calcium sulfate whiskers, 10 parts of glass fibers, 1 part of silicone-modified epoxy resin, 2 parts of magnesium stearate, 6 parts of nano-alumina, 7 parts of polyamide fibers, and 10 parts of wear-resistant carbon black;

[0027] The length of the ultra-short glass fiber is 0.15-0.5 mm, the length of the glass fiber is 6-10 mm, and the length of the modified short fiber of the non-woven product recycled material is 6-10 mm. The preparation method comprises the following steps:

[0028] S1: Put the modified short fibers of recycled non-woven fabrics, carbon fibers, phenolic resin, fluororubber, graphite, steel fibers, aluminum silicate fibers, and fillers into a mixer and mix them evenly at a mixing speed of 300 r / min for 20 min to obtain a first raw material;

[0029] S2: putting floating beads, potassium hexatitanate whiskers, calcium sulfate whiskers, glass fibers, silicone-modified epoxy resin, magnesium stearate, nano-alumina, polyamide fibers, and wear-resistant carbon black into a mixer for mixing to obtain a second raw material, and mixing the second raw material and the first raw material uniformly to obtain a third raw material, with a mixing speed of 300 r / min and a mixing time of 40 min;

[0030] S3: adding the third raw material into the mold, placing it into the forming mold for pressing, and then compounding it with the steel back and placing it into a flat vulcanizer at a high temperature of 350°C and a pressure of 25MPa for 30 minutes to obtain a blank;

[0031] S4: The blank is ground, heat treated, and sprayed to obtain an environmentally friendly brake pad with high friction performance. During the heat treatment, the ground blank is placed in a heat treatment box. The temperature in the treatment box is 120° C. and the heat treatment time is 5 hours.

[0032] Embodiment 2

[0033] The invention provides an environmentally friendly brake pad with high friction performance, which comprises the following raw materials in parts by weight: 35 parts of modified short fibers of recycled non-woven fabrics, 12 parts of carbon fibers, 25 parts of phenolic resin, 7 parts of fluororubber, 12 parts of graphite, 7 parts of steel fibers, 3 parts of aluminum silicate fibers, 12 parts of fillers, 7 parts of floating beads, 7 parts of potassium hexatitanate whiskers, 7 parts of calcium sulfate whiskers, 12 parts of glass fibers, 3 parts of silicone-modified epoxy resin, 5 parts of magnesium stearate, 8 parts of nano-alumina, 12 parts of polyamide fibers, and 12 parts of wear-resistant carbon black;

[0034] The length of the ultra-short glass fiber is 0.15-0.5 mm, the length of the glass fiber is 6-10 mm, and the length of the modified short fiber of the non-woven product recycled material is 6-10 mm. The preparation method comprises the following steps:

[0035] S1: Put the modified short fibers of non-woven product recycling materials, carbon fibers, phenolic resin, fluororubber, graphite, steel fibers, aluminum silicate fibers, and fillers into a mixer and mix them evenly at a mixing speed of 350 r / min for 25 min to obtain a first raw material;

[0036] S2: Put the floating beads, potassium hexatitanate whiskers, calcium sulfate whiskers, glass fibers, silicone-modified epoxy resin, magnesium stearate, nano-alumina, polyamide fibers, and wear-resistant carbon black into a mixer for mixing to obtain a second raw material, and mix the second raw material with the first raw material to obtain a third raw material, with a mixing speed of 350 r / min and a mixing time of 45 min;

[0037] S3: adding the third raw material into the mold, placing it into the forming mold for pressing, and then compounding it with the steel back and placing it into a flat vulcanizer at a high temperature of 350°C and a pressure of 25MPa for 30 minutes to obtain a blank;

[0038] S4: The blank is ground, heat treated, and sprayed to obtain an environmentally friendly brake pad with high friction performance. During the heat treatment, the ground blank is placed in a heat treatment box. The temperature in the treatment box is 130° C. and the heat treatment time is 6 hours.

[0039] Embodiment 3

[0040] The invention provides an environmentally friendly brake pad with high friction performance, which comprises the following raw materials in parts by weight: 40 parts of modified short fibers of recycled non-woven fabrics, 15 parts of carbon fibers, 30 parts of phenolic resin, 10 parts of fluororubber, 15 parts of graphite, 10 parts of steel fibers, 5 parts of aluminum silicate fibers, 15 parts of fillers, 10 parts of floating beads, 10 parts of potassium hexatitanate whiskers, 10 parts of calcium sulfate whiskers, 15 parts of glass fibers, 5 parts of silicone-modified epoxy resin, 7 parts of magnesium stearate, 12 parts of nano-alumina, 15 parts of polyamide fibers, and 15 parts of wear-resistant carbon black;

[0041] The length of the ultra-short glass fiber is 0.15-0.5 mm, the length of the glass fiber is 6-10 mm, and the length of the modified short fiber of the non-woven product recycled material is 6-10 mm. The preparation method comprises the following steps:

[0042] S1: Put modified short fibers from recycled non-woven fabrics, carbon fibers, phenolic resin, fluororubber, graphite, steel fibers, aluminum silicate fibers, and fillers into a mixer and mix them evenly at a mixing speed of 400 r / min for 30 min to obtain a first raw material;

[0043] S2: putting floating beads, potassium hexatitanate whiskers, calcium sulfate whiskers, glass fibers, silicone-modified epoxy resin, magnesium stearate, nano-alumina, polyamide fibers, and wear-resistant carbon black into a mixer for mixing to obtain a second raw material, and mixing the second raw material and the first raw material uniformly to obtain a third raw material, with a mixing speed of 400 r / min and a mixing time of 50 min;

[0044] S3: adding the third raw material into the mold, placing it into the forming mold for pressing, and then compounding it with the steel back and placing it into a flat vulcanizer at a high temperature of 350°C and a pressure of 25MPa for 30 minutes to obtain a blank;

[0045] S4: The blank is ground, heat treated, and sprayed to obtain an environmentally friendly brake pad with high friction performance. During the heat treatment, the ground blank is placed in a heat treatment box. The temperature in the treatment box is 150° C. and the heat treatment time is 7 hours.

[0046] The preparation method of modified short fibers from recycled non-woven products is as follows: A. rinsing and drying the recycled non-woven products; B. feeding the dried recycled non-woven products into a pulverizer and cutting them into 30, 40 or 50 mesh pieces; C. feeding 20, 25 or 30 parts of ultra-short glass fibers with a length of 0.15-0.5 (shorter is better) mm, 0.5-1 part of maleic anhydride grafted polypropylene, 0.5 or 0.7 part of polymethylphenylsiloxane, and 0.2-0.5 part of antioxidant BHT into a high-speed disperser for mixing, and immediately feeding them into a screw extruder for melting after mixing, and extruding the melt through a spinning box for spinning, quenching, and preparing modified long fibers with a diameter of 0.5-1.0 mm; D. cutting the modified long fibers into short fibers to obtain modified short fibers from recycled non-woven products.

[0047] Comparative Example: 10 parts of acrylic pulp, 13.5 parts of mullite ceramic fiber, 3.5 parts of brucite fiber, 5 parts of nano tin powder, 11 parts of zinc sulfide, 5.25 parts of brown corundum, 6.5 parts of antimony sulfide, 8.5 parts of cellulose fiber, 4.6 parts of iron black, 6 parts of calcium carbonate whisker, 9.5 parts of calcium sulfate whisker, 13.3 parts of potassium titanate, 6.5 parts of flake graphite, 7 parts of calcined petroleum coke, 4 parts of flake aluminum powder, 4 parts of nitrile rubber powder, 9 parts of phenolic resin, 1.1 parts of nano manganese hydroxide and 9 parts of molybdenum disulfide were poured into a high-speed disperser by weight, stirred into a uniformly dispersed powder, taken out of the friction material composition, put into a forming mold for compression molding, and then compounded with a steel back and put into a flat vulcanizer at a high temperature of 350° C. and a pressure of 25 MPa for 30 minutes, and then the brake pad was taken out and the burrs were removed to obtain a finished product.

[0048] In order to verify the effect of the present invention, the brake pads prepared in Examples 1 to 3 and the comparative example were subjected to inertia bench tests according to the Chinese national standard GB5763-1998. The results are shown in the following table:

[0049]

[0050] It can be seen from the above table that the high friction performance environmentally friendly brake pad proposed by the present invention has obvious improvements in friction performance and thermal stability in high temperature areas, and implementation 2 is the best implementation example.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. High friction performance environmentally friendly brake pad, characterized by: The invention comprises the following raw materials in parts by weight: 30-40 parts of modified short fibers from recycled non-woven fabrics, 10-15 parts of carbon fibers, 20-30 parts of phenolic resins, 5-10 parts of fluororubbers, 10-15 parts of graphite, 5-10 parts of steel fibers, 1-5 parts of aluminum silicate fibers, 10-15 parts of fillers, 5-10 parts of floating beads, 5-10 parts of potassium hexatitanate whiskers, 5-10 parts of calcium sulfate whiskers, 10-15 parts of glass fibers, 1-5 parts of silicone-modified epoxy resins, 2-7 parts of magnesium stearate, 6-12 parts of nano-alumina, 7-15 parts of polyamide fibers, and 10-15 parts of wear-resistant carbon black. The method for preparing the modified short fibers of non-woven product recyclate is as follows: A. rinsing the non-woven product recyclate clean and drying; B. feeding the dried non-woven product recyclate into a pulverizer and cutting it into 30-50 mesh pieces; C. feeding 20-30 parts of ultra-short glass fibers with a length of 0.15-0.5 mm, 0.5-1 parts of maleic anhydride grafted polypropylene, 0.5-1 parts of polymethylphenylsiloxane, and 0.2-0.5 parts of antioxidant BHT into a high-speed disperser for mixing, and immediately feeding the mixture into a screw extruder for melting, and extruding the melt through a spinning box for spinning, quenching, and preparing modified long fibers with a diameter of 0.5-1.0 mm; D. cutting the modified long fibers into short fibers to obtain modified short fibers of non-woven fabric recyclate; The preparation steps include: S1: Putting modified short fibers of recycled non-woven fabrics, carbon fibers, phenolic resin, fluororubber, graphite, steel fibers, aluminum silicate fibers, and fillers into a mixer and mixing them evenly to obtain a first raw material; S2: putting floating beads, potassium hexatitanate whiskers, calcium sulfate whiskers, glass fibers, silicone-modified epoxy resin, magnesium stearate, nano-aluminum oxide, polyamide fibers, and wear-resistant carbon black into a mixer for mixing to obtain a second raw material, and uniformly mixing the second raw material with the first raw material to obtain a third raw material; S3: adding the third raw material into the mold, placing it into the forming mold for pressing, and then compounding it with the steel back and placing it into a flat vulcanizer at a high temperature of 350°C and a pressure of 25MPa for 30 minutes to obtain a blank; S4: Grinding, heat treating and spraying the blank to produce an environmentally friendly brake pad with high friction performance.

2. The high friction performance environmentally friendly brake pad according to claim 1, characterized in that: The length of the ultra-short glass fiber is 0.15-0.5 mm.

3. The high friction performance environmentally friendly brake pad according to claim 1, characterized in that: The glass fiber has a length of 6-10 mm.

4. The high friction performance environmentally friendly brake pad according to claim 1, characterized in that: The length of the modified short fibers of the non-woven product recycled material is 6-10 mm.

5. The high friction performance environmentally friendly brake pad according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 35 parts of modified short fibers from recycled non-woven fabrics, 12 parts of carbon fibers, 25 parts of phenolic resins, 7 parts of fluororubbers, 12 parts of graphite, 7 parts of steel fibers, 3 parts of aluminum silicate fibers, 12 parts of fillers, 7 parts of floating beads, 7 parts of potassium hexatitanate whiskers, 7 parts of calcium sulfate whiskers, 12 parts of glass fibers, 3 parts of silicone-modified epoxy resins, 4 parts of magnesium stearate, 9 parts of nano-alumina, 10 parts of polyamide fibers, and 12 parts of wear-resistant carbon black.

6. The high friction performance environmentally friendly brake pad according to claim 1, characterized in that: In step S1, modified short fibers of recycled non-woven fabrics, carbon fibers, phenolic resin, fluororubber, graphite, steel fibers, aluminum silicate fibers, and fillers are put into a mixer and mixed evenly at a mixing speed of 300-400 r / min and a mixing time of 20-30 min.

7. The high friction performance environmentally friendly brake pad according to claim 1, characterized in that: In step S2, floating beads, potassium hexatitanate whiskers, calcium sulfate whiskers, glass fibers, silicone-modified epoxy resins, magnesium stearate, nano-alumina, polyamide fibers, and wear-resistant carbon black are put into a mixer for mixing to obtain a second raw material. The second raw material is evenly mixed with the first raw material to obtain a third raw material. The mixing speed is 300-400 r / min and the mixing time is 40-50 min.

8. The high friction performance environmentally friendly brake pad according to claim 1, characterized in that: In step S4, the ground blank is placed in a heat treatment box, the temperature in the treatment box is 120-150°C, and the heat treatment time is 5-7h.

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