CN112240364A - Friction material regulator for enhancing toughness and tensile strength - Google Patents

Abstract

The invention belongs to the technical field of high-strength friction materials, and particularly relates to a friction material regulator for enhancing toughness and tensile strength, which comprises mineral composite fibers, ceramic fibers, polyvinyl alcohol fibers, flexible graphite and elastic friction particles which are matched according to a specific proportion of a formula, when the brake pad is used in the braking process of train operation, the physical and chemical properties of the product can be effectively ensured while the friction and abrasion performance is stabilized, the safety of the train operation is ensured, the brake pad is reasonable in structure, mainly made of high polymer materials, and has the advantages of light specific gravity, high toughness, high tensile strength and moderate hardness while meeting the braking requirement, the friction material reinforcing regulator is mixed with the friction regulator and the adhesive by banburying equipment, so that the friction material achieves the effects of reinforcing the toughness and tensile strength of products.

Description

Friction material regulator for enhancing toughness and tensile strength

Technical Field

The invention relates to the technical field of high-strength friction materials, in particular to a friction material regulator for enhancing toughness and tensile strength.

Background

The friction material is a high molecular ternary composite material and is a physical and chemical complex. It is made up by using three kinds of components of high-molecular adhesive (resin and rubber), reinforcing fibre and friction property regulator and other compounding agent through a series of processes. Meanwhile, the brake pad has certain requirements on the toughness and tensile strength, and can meet the performance requirements of transmission and braking of vehicles or machinery. Is widely applied to the aspects of power transmission or braking deceleration.

The railway laying length in China has become the first in the world, high-speed trains are widely used, and the strength of a friction material must be ensured in the braking process of the high-speed trains, so that effective and stable braking performance is provided for the trains.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.

Therefore, the invention aims to provide a strengthening regulator for friction materials, which has the advantages of simple production process, low cost, energy conservation and environmental protection, and can meet the requirements of strengthening the toughness and tensile strength of the train braking performance.

To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:

a friction material regulator for enhancing toughness and tensile strength comprises mineral composite fibers, ceramic fibers, polyvinyl alcohol fibers, flexible graphite and elastic friction particles, wherein the mineral composite fibers, the ceramic fibers, the polyvinyl alcohol fibers, the flexible graphite and the elastic friction particles are matched according to a specific formula proportion, and are used in the train running and braking process, so that the friction and wear performance is stabilized, and the physical and chemical properties of a product are effectively guaranteed, and the running safety of a vehicle is ensured;

wherein the content of the first and second substances,

40-45% of mineral composite fiber, 12-15% of ceramic fiber, 8-12% of polyvinyl alcohol fiber, 5-10% of flexible graphite and 15-18% of elastic friction particles.

As a preferable aspect of the friction material modifier for enhancing toughness and tensile strength according to the present invention, wherein: the preparation method comprises the following steps:

and (3) putting the raw materials weighed according to the proportion into a high-speed mixer, and starting the high-speed mixer to stir for 30 minutes.

As a preferable aspect of the friction material modifier for enhancing toughness and tensile strength according to the present invention, wherein: the storage condition requires: temperature: 10-30 ℃; humidity: 35% -75%; storing in dark place; the shelf life is 180 days.

Compared with the prior art, the invention has the beneficial effects that: compared with the prior art, the invention has the beneficial effects that:

1. the friction material for enhancing the toughness and the tensile strength does not contain asbestos, lead and other substances which are possibly harmful to human health, and belongs to an environment-friendly product;

2. the brake pad mainly comprises a high polymer material, and has the characteristics of light specific gravity, high toughness, high tensile strength, moderate hardness, no thermal damage to a brake dual surface, stable and comfortable braking, long service life and the like while meeting the braking requirement;

3, the friction material reinforcing regulator is mixed with the friction regulator and the adhesive for use through banburying equipment, so that the friction material achieves the effect of enhancing the toughness and tensile strength of a product; the product can better adapt to different actual operation conditions such as large difference of environmental conditions and the like, and the running of the train is met.

Detailed Description

The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and it will be apparent to those of ordinary skill in the art that the present invention may be practiced without departing from the spirit and scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.

The first embodiment is as follows:

the technical scheme adopted by the invention is as follows: the composite brake shoe for the locomotive comprises a friction body and a steel back, wherein the friction body is made of nitrile rubber, a rubber accelerator, a rubber vulcanizing agent, an anti-aging agent, boron modified phenolic resin, nitrile rubber powder, foamed iron powder, diatomite, silicon carbide, alumina, artificial graphite, vermiculite, carbon black, pottery clay, barium sulfate, cotton fiber, a reinforcing regulator, steel fiber and glass fiber; the weight percentage of each component is as follows: 9% of nitrile rubber, 0.75% of rubber accelerator, 0.8% of rubber vulcanizing agent, 0.5% of anti-aging agent, 9.5% of boron modified phenolic resin, 4% of nitrile rubber powder, 6% of foamed iron powder, 3% of diatomite, 2% of silicon carbide, 2% of aluminum oxide, 6% of artificial graphite, 2% of vermiculite, 5% of carbon black, 5% of clay, 8% of barium sulfate, 10% of cotton fiber, 20% of reinforcing regulator, 5% of steel fiber and 5% of glass fiber;

the preparation method of the locomotive composite brake shoe comprises the following steps:

1) the nitrile rubber is open-milled in two sections, the roll temperature of the first section is 40-45 ℃, the roll gap is 2-3 mm, the raw rubber is firstly added, the anti-aging agent and the carbon black are added, and the nitrile rubber is taken out and placed; the second section of roller temperature is 35-40 ℃, the roller spacing is 3-4 mm, first section of rubber is added, the rubber vulcanizing agent is added after the rubber is uniformly mixed with the cutting knife, and the cutting knife is thin and through after the rubber is completely mixed with the rubber vulcanizing agent;

2) adding the glue obtained in the step 1) and the rest components of the friction body into an internal mixer for pressure mixing, controlling the temperature to be less than or equal to 90 ℃, strongly mixing, standing and cooling to room temperature to obtain the friction material meeting the requirements of enhancing toughness and tensile strength;

3) pressing the friction material prepared in the step 2) on a specific steel back by using a mold, heating to 140 ℃ and 160 ℃ for hot press forming under the pressure of a press machine of 20-24 MPa to obtain a formed semi-finished product;

4) and (3) heating the treated brake shoe in an oven by adopting hot air circulation electric heating for 36H, gradually raising the temperature of the first 22H until the highest heat treatment temperature reaches 250 ℃, keeping the heat treatment temperature at 250 ℃ for the second 14H, fully reacting all the raw materials, and ensuring complete maturity to obtain the composite brake shoe. The heat treatment adopts a sectional heat treatment mode, the temperature is gradually increased, the surface of the brake shoe is ensured to be consistent with the internal temperature thereof, the maturation degree of the composite material is ensured to be consistent, and the effective heat treatment can be ensured by adopting hot air circulation electric heating.

TABLE 1 temperature and time during Heat treatment

Wherein: the heating process is accumulated to 22H, and then the constant temperature of 250 ℃ is kept for 14 hours, and the whole heat treatment process is 36H.

Table 2 comparison of product test data

Through test data, the toughness and tensile strength of the improved product are obviously improved. While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (3)

1. A friction material modifier for enhancing toughness and tensile strength is characterized in that: the friction material comprises mineral composite fibers, ceramic fibers, polyvinyl alcohol fibers, flexible graphite and elastic friction particles, is matched according to a specific formula proportion, is used in the train running and braking process, effectively guarantees the physical and chemical properties of the product while stabilizing the friction and abrasion properties, and ensures the running safety of a vehicle

Wherein the content of the first and second substances,

40-45% of mineral composite fiber, 12-15% of ceramic fiber, 8-12% of polyvinyl alcohol fiber, 5-10% of flexible graphite and 15-18% of elastic friction particles.

2. A method of preparing a friction material modifier with enhanced toughness and tensile strength as defined in claim 1, wherein: the preparation method comprises the following steps:

and (3) putting the raw materials weighed according to the proportion into a high-speed mixer, and starting the high-speed mixer to stir for 30 minutes.

3. The friction material modifier of claim 1, wherein: the storage condition requires: temperature: 10-30 ℃; humidity: 35% -75%; storing in dark place; the shelf life is 180 days.