CN112795133A - Sheet molding compound for preparing friction material and preparation method thereof - Google Patents
Sheet molding compound for preparing friction material and preparation method thereof Download PDFInfo
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- CN112795133A CN112795133A CN202011637002.3A CN202011637002A CN112795133A CN 112795133 A CN112795133 A CN 112795133A CN 202011637002 A CN202011637002 A CN 202011637002A CN 112795133 A CN112795133 A CN 112795133A
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Abstract
The invention belongs to the technical field of friction braking, and particularly relates to a sheet molding compound for preparing a friction material and a preparation method thereof. The sheet molding compound comprises the following components: 5-10% of prepolymer phenolic resin, 5-15% of powder phenolic resin, 5-15% of nitrile rubber powder, 10-20% of precipitated barium sulfate, 5-10% of compound thickening agent, 5-15% of mineral wool, 1-3% of aluminum oxide, 3-7% of graphite, 3-8% of short carbon fiber, 1-5% of vermiculite, 1-5% of foaming agent, 5-10% of urotropine, 5-15% of modified fibrilia, 5-10% of zinc stearate and 1-5% of surfactant. The Sheet Molding Compound (SMC) can realize the preparation of the environment-friendly, light and low-noise friction material for the automobile.
Description
Technical Field
The invention belongs to the technical field of friction braking, and particularly relates to a sheet molding compound for preparing a friction material and a preparation method thereof.
Background
Because the raw materials of the friction material contain a large amount of fine mineral particles, mineral rock wool, organic fibers and organic powder, a large amount of dust is easily generated in the mixing and transferring processes during the preparation process, so that the ecological environment is influenced, and the body health of field operation workers is adversely affected. Meanwhile, the materials mixed in the material mixing process have loose structures, are easy to raise dust and absorb moisture, and can be agglomerated and deteriorated after being stored for a long time.
The friction material for the automobile prepared by the traditional dry process has poor compactness, is extremely easy to be subjected to thermal expansion in the using process, causes the brake drum to be stuck, and seriously influences the running safety of the automobile. The friction material product prepared by the traditional wet process has high hardness and is easy to break under impact.
Disclosure of Invention
The invention aims to provide a sheet molding compound for preparing a friction material.
The invention also aims to provide a preparation method of the sheet molding compound.
The sheet molding compound for preparing the friction material according to the embodiment of the invention comprises the following components: 5-10 wt% of liquid phenolic resin, 5-15 wt% of powder phenolic resin, 5-15 wt% of nitrile rubber powder, 10-20 wt% of precipitated barium sulfate, 5-10 wt% of compound thickener, 5-15 wt% of mineral wool, 1-3 wt% of aluminum oxide, 3-7 wt% of graphite, 3-8 wt% of short carbon fiber, 1-5 wt% of vermiculite, 1-5 wt% of foaming agent, 5-10 wt% of urotropine, 5-15 wt% of modified fibrilia, 5-10 wt% of zinc stearate and 1-5 wt% of surfactant.
According to the sheet molding compound for preparing the friction material, the built thickener comprises the following components in a weight ratio of 1: 1.5-2 parts of calcium hydroxide: and (3) magnesium oxide.
The calcium hydroxide is an alkaline substance, and can adjust the acidity and alkalinity of the product, so that the acid corrosion and the rust corrosion of the friction mating surface are avoided; the friction coefficient of the product can be adjusted by the magnesium oxide, and the calcium hydroxide and the magnesium oxide are compounded and blended into a proper proportion, so that the optimal performance of the product is ensured.
According to the sheet molding compound for preparing the friction material, the weight ratio of the foaming agent to the urotropine is 1: 2 to 3.
The invention strictly controls the adding proportion of the urotropine and the foaming agent, ensures that foaming and curing are carried out simultaneously, and ensures that the whole molding compound can be uniformly foamed and has proper strength.
According to the sheet molding compound for preparing a friction material according to the embodiment of the present invention, the foaming agent is one of petroleum ether, n-butane or toluene.
According to the sheet molding compound for preparing the friction material, the polymerization degree of the liquid phenolic resin is 5-50.
The liquid phenolic resin with the polymerization degree of 5-50 is matched with the preparation process disclosed by the invention, so that the sheet molding compound disclosed by the invention has excellent processing performance, is moderate in product viscosity, is convenient to mix, is easy to form, and avoids the condition that the sheet molding compound cannot be formed.
According to the sheet molding compound for preparing the friction material, the length of the chopped carbon fiber is 5-8 mm. In the mixing process, the high-speed stirring knife used in the traditional dry mixing method causes the damage to the use length of the carbon fiber, so that the length of the short carbon fiber is generally within 3 mm; the chopped carbon fibers with the length of 5-8 mm are matched with the preparation method disclosed by the invention, and the length of the carbon fibers cannot be damaged in the processing process, so that the product is ensured to have good mechanical strength and integrity.
The preparation method of the sheet molding compound for preparing the friction material according to the embodiment of the invention comprises the following steps:
(1) adding liquid phenolic resin, powdered phenolic resin, nitrile rubber powder, precipitated barium sulfate, alumina, graphite, vermiculite, urotropine, modified fibrilia and zinc stearate into an open mill for curing, wherein the rotating speed of the open mill is 15-25 r/min, and the curing time is 25-35 min to obtain a cured material;
(2) adding a foaming agent, a surfactant, chopped carbon fibers and mineral wool into an open mill, and mixing with the cured material, wherein the roller temperature of the open mill is controlled to be 60-80 ℃, and the mixing time is 50-70 min, so as to obtain a mixed material;
(3) adding the compound thickener into the mixed material, mixing for 30min, and pressing the sheet molding compound;
(4) and foaming the sheet molding compound for 50-70 min at the temperature of 65-75 ℃.
According to the preparation method of the sheet molding compound for preparing the friction material, the upper surface and the lower surface of the sheet molding compound are respectively coated with the plastic films to prepare the coiled material.
According to the preparation method of the sheet molding compound for preparing the friction material, in the step (1), the roller temperature is less than 50 ℃ in the curing process, namely the roller temperature is between room temperature and 50 ℃.
According to the preparation method of the sheet molding compound for preparing the friction material, in the step (1), the rotating speed of the open mill is 20 revolutions per minute, and the curing time is 30 min.
The invention has the beneficial effects that:
the sheet molding compound is added with the liquid phenolic resin, so that the loose structure of the dry mixture is changed, the dust in the mixing process is reduced, and the production process is more environment-friendly;
the liquid phenolic resin is also matched with a foaming agent and a curing agent, so that bubbles in the sheet molding compound are uniformly distributed, the density of the sheet molding compound is reduced, and the 5-8 mm short carbon fibers can effectively inhibit the brittle fracture of the foam. Therefore, the foam structure in the sheet molding compound can better weaken high-frequency noise and improve the braking comfort in the braking process, and the micro-porous structure can absorb small molecular substances released by the friction material in the recession process, so that the recession of the friction material is inhibited.
The sheet molding compound is mixed by an open mill, and the material structure is more compact due to repeated extrusion and cutting, so that the expansion rate of a hot-pressed finished product at a high temperature stage is extremely low, and the use safety of the friction material is greatly improved;
the sheet molding compound is stored for 1 month or more at room temperature, and the storage time of the sheet molding compound is greatly prolonged compared with the storage time of materials prepared by a dry process, so that the productivity is effectively released, and the production efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the sheet molding compound of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1
The sheet molding compound comprises the following components in percentage by weight:
| example 1 | Example 2 | Example 3 | |
| Liquid phenolic resin | 6 | 8 | 9 |
| Powder phenolic resin | 8 | 6 | 6 |
| Mineral wool | 14 | 10 | 8 |
| Nitrile rubber powder | 5 | 7 | 9 |
| Precipitated barium sulfate | 24 | 14 | 13 |
| Compound thickener | 5 | 6 | 9 |
| Graphite | 7 | 11 | 8 |
| Chopped carbon fiber | 4 | 7 | 7 |
| Alumina oxide | 1 | 2 | 2 |
| Vermiculite | 1 | 4 | 2 |
| Urotropine | 9 | 6 | 8 |
| Fibrilia | 6 | 11 | 8 |
| Foaming agent | 3 | 2 | 4 |
| Surface active agent | 2 | 1 | 2 |
| Zinc stearate | 5 | 5 | 5 |
The preparation method comprises the following steps:
(1) adding liquid phenolic resin, powdered phenolic resin, nitrile rubber powder, precipitated barium sulfate, alumina, graphite, vermiculite, urotropine, modified fibrilia and zinc stearate into an open mill for curing, wherein the rotating speed of the open mill is 15-25 r/min, and the curing time is 25-35 min to obtain a cured material;
(2) adding a foaming agent, a surfactant, chopped carbon fibers and mineral wool into an open mill, and mixing with the cured material, wherein the roller temperature of the open mill is controlled to be 60-80 ℃, and the mixing time is 50-70 min, so as to obtain a mixed material;
(3) adding the compound thickener into the mixed material, mixing for 30min, and pressing the sheet molding compound;
(4) and foaming the sheet molding compound for 50-70 min at the temperature of 65-75 ℃.
(5) And (4) coating plastic films on the upper surface and the lower surface of the sheet molding compound after discharging, and preparing the sheet molding compound into a coiled material.
In the preparation method, in the step (1), the rotating speed of the open mill can be 15, 20 or 25 revolutions per minute;
in the step (1), the curing time of the materials in the open mill can be 25, 30 or 30 min;
in the step (2), the roller temperature of the open mill is controlled at 60, 65, 70, 75 or 80 ℃;
in the step (2), the mixing time is 50, 60 or 70 min;
in the step (4), the sheet molding compound is placed at the temperature of 65, 70 or 75 ℃;
in the step (4), the foaming time is 50, 60 or 70 min.
When the sheet molding compound is used, the sheet molding compound is unfolded, the surface coating layer is removed, a proper prepressing material is cut according to the size of a product, and the sheet molding compound can be used in a multi-layer tiled mode.
And putting the pre-pressed material into a press, adjusting the pressure of the press to 15MPa and the temperature to 160 ℃, maintaining the pressure for 10min, and adjusting the exhaust frequency. And after pressing, putting the hot-pressed semi-finished product into an oven, and carrying out heat treatment at 180 ℃ for 8 hours.
EXAMPLE 2 determination of product Properties
The friction plates made of the sheet molding compounds obtained in examples 1 to 3 were compared with commercially available products in terms of friction performance, thermal expansion coefficient, impact strength, and compression strength,
the constant speed test is carried out according to GB 5763-;
thermal expansion coefficient: detecting the size of the sample at 200 ℃, and comparing the size with the size of the sample at normal temperature;
storage stability: placing the sample in the air for one month to observe the appearance of the sample and pressing the sample;
impact strength: GB/T33835-2017 friction material impact strength test method;
compressive strength: measuring the compression performance of GB/T1041-;
commercial sources: comparative example 1 is a finished part of a commercial vehicle produced by Hubei Feilong Friction sealing Material Ltd.
TABLE 1 results of comparison of frictional properties
As can be seen from Table 1, the density of the brake pads made of the sheet molding compounds of examples 1, 2 and 3 of the present invention decreased by 10% to 20% in terms of density.
In terms of thermal expansion rates, the thermal expansion rates of the brake pads made of the sheet molding compounds of examples 1, 2 and 3 of the present invention were 0.12%, 0.17% and 0.11%, respectively, which were much lower than those of the samples prepared in comparative example 1 by the dry blending method. In terms of friction coefficient, the brake pads made of the sheet molding compounds of examples 1, 2 and 3 of the present invention performed better at high temperature stage, and did not change significantly at 300 ℃, while the comparative examples exhibited significant heat fading at 300 ℃.
As can be seen from the table, the impact strength of the examples 1, 2 and 3 is higher than that of the comparative example 1, and according to the common knowledge in the field, the introduction of the foaming agent reduces the compactness of the material, and the impact strength is reduced to some extent, but the carbon fiber with the length of 5-8 mm is adopted in the invention, so that the impact property of the product is improved, the brittle fracture of the material is inhibited, and the effect is remarkable.
Therefore, the friction product prepared by the sheet molding compound has better friction and wear properties; meanwhile, the thermal expansion rate and the density are lower, so that the cost and the brake locking risk can be effectively reduced; the dust generated in the material mixing process can be effectively reduced, and the molding compound can be placed for a long time.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A sheet molding compound for use in preparing a friction material, the sheet molding compound comprising the following ingredients: 5-10 wt% of liquid phenolic resin, 5-15 wt% of powder phenolic resin, 5-15 wt% of nitrile rubber powder, 10-20 wt% of precipitated barium sulfate, 5-10 wt% of compound thickener, 5-15 wt% of mineral wool, 1-3 wt% of aluminum oxide, 3-7 wt% of graphite, 3-8 wt% of short carbon fiber, 1-5 wt% of vermiculite, 1-5 wt% of foaming agent, 5-10 wt% of urotropine, 5-15 wt% of modified fibrilia, 5-10 wt% of zinc stearate and 1-5 wt% of surfactant.
2. The sheet molding compound for preparing a friction material according to claim 1, wherein the built thickener comprises a weight ratio of 1: 1.5-2 parts of calcium hydroxide: and (3) magnesium oxide.
3. The sheet molding compound for preparing a friction material as defined in claim 1, wherein the weight ratio of the foaming agent to urotropin is 1: 2 to 3.
4. The sheet molding compound for manufacturing a friction material as defined in claim 1 or 3, wherein said blowing agent is one of petroleum ether, n-butane or toluene.
5. The sheet molding compound for preparing a friction material as claimed in claim 1, wherein the degree of polymerization of the liquid phenolic resin is 5 to 50.
6. The sheet molding compound for preparing a friction material as claimed in claim 1, wherein the chopped carbon fibers have a length of 5 to 8 mm.
7. The method of preparing a sheet molding compound for use in preparing a friction material according to claim 1, comprising the steps of:
(1) adding liquid phenolic resin, powdered phenolic resin, nitrile rubber powder, precipitated barium sulfate, alumina, graphite, vermiculite, urotropine, modified fibrilia and zinc stearate into an open mill for curing, wherein the rotating speed of the open mill is 15-25 r/min, and the curing time is 25-35 min to obtain a cured material;
(2) adding a foaming agent, a surfactant, chopped carbon fibers and mineral wool into an open mill, and mixing with the cured material, wherein the roller temperature of the open mill is controlled to be 60-80 ℃, and the mixing time is 50-70 min, so as to obtain a mixed material;
(3) adding the compound thickener into the mixed material, mixing for 30min, and pressing the sheet molding compound;
(4) and foaming the sheet molding compound for 50-70 min at the temperature of 65-75 ℃.
8. The method as claimed in claim 7, wherein the sheet molding compound is coated with plastic films on its upper and lower surfaces to form a coil.
9. The method of claim 7, wherein the roller temperature is less than 50 ℃ during the aging step (1).
10. The method of claim 7, wherein in the step (1), the rotation speed of the open mill is 20 rpm, and the aging time is 30 min.
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| CN113912899A (en) * | 2021-11-05 | 2022-01-11 | 江苏赋瑞密封材料有限公司 | Brake pad low-noise friction material and brake pad |
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