阅读说明：本技术 一种纤维增强的dct湿式离合器摩擦纸及其制备方法 (Fiber-reinforced DCT (discrete cosine transformation) wet clutch friction paper and preparation method thereof ) 是由 张明远 杨天博 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种纤维增强的DCT湿式离合器摩擦纸及其制备方法,由增强纤维、摩擦性能调节剂、填料、原纸材料分散剂及粘接剂组成,其质量百分比组成如下：增强纤维15－55％、摩擦性能调节剂15－40％、填料10－30％、分散剂1－5％、粘接剂15－50％。本发明通过使用玄武岩纤维或FKF纤维作为用于湿式运行摩擦内衬的非金属纤维材料,可以获得碳基材料摩擦内衬的良好性能,相比于单纯碳纤维增强,上述两种纤维制备方便、性能良好又降低了成本。FKF纤维是将多种天然矿物纤维和人造矿物纤维组合在一起制成,耐热性高于石棉,价格低于大部分非石棉纤维。(The invention discloses fiber-reinforced DCT wet clutch friction paper and a preparation method thereof, wherein the fiber-reinforced DCT wet clutch friction paper comprises reinforced fibers, a friction performance regulator, a filler, a base paper material dispersant and an adhesive, and the fiber-reinforced DCT wet clutch friction paper comprises the following components in percentage by mass: 15-55% of reinforcing fiber, 15-40% of friction performance regulator, 10-30% of filler, 1-5% of dispersant and 15-50% of adhesive. According to the invention, the basalt fiber or FKF fiber is used as the non-metallic fiber material for the wet-type running friction lining, so that the carbon-based friction lining can have good performance, and compared with the single carbon fiber reinforcement, the two fibers are convenient to prepare, have good performance and reduce the cost. FKF fibers are made by combining a plurality of natural mineral fibers and artificial mineral fibers, have higher heat resistance than asbestos and are less expensive than most non-asbestos fibers.)

1. The fiber-reinforced DCT wet clutch friction paper is characterized by comprising reinforced fibers, a friction performance regulator, a filler, a base paper material dispersant and an adhesive, wherein the fiber-reinforced DCT wet clutch friction paper comprises the following components in percentage by mass: 15-55% of reinforcing fiber, 15-40% of friction performance regulator, 10-30% of filler, 1-5% of dispersant and 15-50% of adhesive.

2. The fiber reinforced DCT wet clutch friction paper as claimed in claim 1, wherein said reinforcing fiber is one or more of basalt fiber, aramid fiber, polyacrylonitrile-based carbon fiber, pitch-based carbon fiber, natural mineral fiber, FKF fiber, polyvinyl alcohol fiber.

3. The fiber-reinforced DCT wet clutch friction paper as set forth in claim 1, wherein the friction property modifier is one or more of cashew nut oil friction powder, precipitated barium sulfate, artificial graphite, chromite powder, alumina, antimony sulfide, molybdenum disulfide, mica.

4. The fiber reinforced DCT wet clutch friction paper of claim 1, wherein the filler is one or more of barite, bauxite, kaolin, talc.

5. A fiber reinforced DCT wet clutch friction paper as defined in claim 1, wherein said dispersant is one or both of barium hyaluronate, calcium stearate, polyethylene glycol.

6. The fiber-reinforced DCT wet clutch friction paper of claim 1, wherein the binder is one or more of phenolic resin, cashew nut shell oil modified resin, melamine modified resin, boron modified resin.

7. The fiber reinforced DCT wet clutch friction paper as in claim 1, wherein said binder is cashew nut shell oil modified phenolic resin or melamine modified phenolic resin.

8. The method for preparing fiber-reinforced DCT wet clutch friction paper according to claim 1, comprising the following steps:

(1) adding the reinforced fiber and the dispersing agent into distilled water, stirring for 30 minutes at the water temperature of 50 +/-5 ℃ to uniformly mix the reinforced fiber and the dispersing agent;

(2) starting a beater to further uniformly mix the components, wherein the beating concentration is 3-9%, and the beating degree is 40-60 DEG SR, so as to prepare a fiber reinforced mixed solution;

(3) adding a friction performance regulator, a filler and an adhesive into the mixed solution, and uniformly distributing the mixture in the mixed solution, wherein the used solvent is a mixed solution of polyethylene oxide and polyethylene oxide;

(4) extracting the vacuum degree to be 0.05 MPa-0.1 MPa, and removing a large amount of water to obtain a prefabricated body containing fibers;

(5) drying the mixture by using papermaking drying equipment at the temperature of 80-110 ℃ for 1-2 h, and completely removing residual moisture to obtain a dry friction paper mixture blank;

(6) dipping the blank in glue, wherein the mass concentration of a binder adopted in the glue dipping is 40% -60%, so that the blank of the friction paper containing the glue is obtained, and the glue content of the dipped mixture is 25% -40%;

(7) and carrying out hot-pressing curing at the curing pressure of 0.5-5 MPa and the temperature of 140-200 ℃ for 5-15 minutes to finally obtain the fiber-reinforced DCT wet clutch friction paper.

9. The method of preparing fiber-reinforced DCT wet clutch friction paper according to claim 8, wherein the mass ratio of the reinforcing fiber and the dispersant in step (1) is 10: 1.

Technical Field

The invention relates to a friction material, in particular to fiber-reinforced DCT wet clutch friction paper and a preparation method thereof.

Background

The wet clutch facing is a vital component of a DCT (double clutch transmission), and the performance of the wet clutch facing directly influences the performance of a clutch assembly. The overseas major companies adopting the wet clutch facing have American Bogefara, Japan Danai time and American Rabestow, the products of the companies almost cover the whole world, the market share reaches more than 80 percent, the technology locks China all the time abroad, and the technology creates a technical barrier, so that the development of the domestic wet clutch facing technology is late.

The composition of the paper-based friction material is a main factor influencing the material performance, the reinforcing fiber used by the early paper-based friction material is mainly cellulose fiber or asbestos fiber, and the mechanical performance of the cellulose fiber is limited; asbestos fibers are harmful to health and cause environmental pollution; wood fibers or bamboo fibers developed by scholars in recent years have poor heat resistance; the carbon fiber has excellent performance but high cost, so that a fiber reinforced material which has stable performance, low price and no pollution to environment is required to be found.

Disclosure of Invention

In order to solve the above problems in the prior art, the present invention provides a fiber-reinforced DCT wet clutch friction paper, which can obtain good performance of a carbon-based material friction lining by using basalt fiber or FKF fiber as a non-metallic fiber material for a wet running friction lining, and the two fibers are conveniently prepared, have good performance and reduce cost compared to simple carbon fiber reinforcement. FKF fibers are made by combining a plurality of natural mineral fibers and artificial mineral fibers, have higher heat resistance than asbestos and are less expensive than most non-asbestos fibers.

The invention is realized by the following technical scheme:

the fiber-reinforced DCT wet clutch friction paper consists of reinforced fibers, a friction performance regulator, a filler, a base paper material dispersant and an adhesive, and comprises the following components in percentage by mass: 15-55% of reinforcing fiber, 15-40% of friction performance regulator, 10-30% of filler, 1-5% of dispersant and 15-50% of adhesive.

Further, the reinforced fiber is one or more of basalt fiber, aramid fiber, polyacrylonitrile-based carbon fiber, asphalt-based carbon fiber, natural mineral fiber, FKF fiber and polyvinyl alcohol fiber.

Further, the friction performance regulator is one or more of cashew nut oil friction powder, precipitated barium sulfate, artificial graphite, chromite powder, aluminum oxide, antimony sulfide, molybdenum disulfide and mica.

Further, the filler is one or more of barite, bauxite, kaolin and talcum powder.

Further, the dispersing agent is one or two of barium hyaluronate, calcium stearate and polyethylene glycol.

Further, the adhesive is one or more of phenolic resin, cashew nut shell oil modified resin, melamine modified resin and boron modified resin.

Further, the adhesive is cashew nut shell oil modified phenolic resin or melamine modified phenolic resin.

A preparation method of fiber-reinforced DCT wet clutch friction paper comprises the following specific steps:

(1) adding the reinforced fiber and the dispersing agent into distilled water, stirring for 30 minutes at the water temperature of 50 +/-5 ℃ to uniformly mix the reinforced fiber and the dispersing agent;

(2) starting a beater to further uniformly mix the components, wherein the beating concentration is 3-9%, and the beating degree is 40-60 DEG SR, so as to prepare a fiber reinforced mixed solution;

(3) adding a friction performance regulator, a filler and an adhesive into the mixed solution, and uniformly distributing the mixture in the mixed solution, wherein the used solvent is a mixed solution of polyethylene oxide and polyethylene oxide;

(4) extracting the vacuum degree to be 0.05 MPa-0.1 MPa, and removing a large amount of water to obtain a prefabricated body containing fibers;

(5) drying the mixture by using papermaking drying equipment at the temperature of 80-110 ℃ for 1-2 h, and completely removing residual moisture to obtain a dry friction paper mixture blank;

(6) dipping the blank in glue, wherein the mass concentration of a binder adopted in the glue dipping is 40% -60%, so that the blank of the friction paper containing the glue is obtained, and the glue content of the dipped mixture is 25% -40%;

(7) and carrying out hot-pressing curing at the curing pressure of 0.5-5 MPa and the temperature of 140-200 ℃ for 5-15 minutes to finally obtain the fiber-reinforced DCT wet clutch friction paper.

Further, the mass ratio of the reinforcing fibers and the dispersing agent in the step (1) is 10: 1.

Compared with the prior art, the invention has the following advantages:

the production process of the fiber-reinforced DCT wet clutch friction paper is scientific and reasonable, has high production efficiency and low cost, breaks through blockade in foreign technologies, replaces foreign products, and has good comprehensive benefits. The main reinforced fiber is basalt fiber or FKF fiber, is used on a DCT wet clutch facing, can meet the use requirement of a DCT clutch assembly, and has good heat fading resistance and long service life.

Drawings

FIG. 1 is a graph of durability and reliability of fiber-reinforced DCT wet clutch friction paper prepared in example 2 of the present invention at different rotational speeds;

wherein, (a)1500r/min, (b)3500r/min, (c)5000r/min and (d)6000 r/min.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.