Preparation method for para aminobenzoic acid lossless modified carbon fiber enhanced paper base wet-type friction material

A technology of p-aminobenzoic acid and wet friction materials, which is applied in the treatment of carbon fiber, synthetic cellulose/non-cellulose material pulp/paper, and fiber raw materials. There are no problems such as practical application, to achieve the effect of improving the bonding effect, improving the friction and wear performance, and enhancing the bonding strength

Active Publication Date: 2017-04-05
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

However, the experimental steps are cumbersome, the operation process is complicated, and the requirements for experimental conditions and equipment are high, so it has not been practically applied.
Chinese patent application number 200310460902.6.7 "A Method for Chemical Grafting and Modification of Carbon Fiber Surface" uses acetone-cleaned carbon fiber to be placed in a supercritical acetone-water system with a temperature of 350°C-370°C and a pressure of 8MPa-14MPa Soak in medium for 20-30 minutes to remove the epoxy coating of the fiber. Although this method removes the epoxy coating very well, it does not improve the surface activity of the fiber and improve the interface between the fiber and the matrix. During the experiment, the temperature and pressure High, high requirements for equipment
The Chinese patent of CN103541212A "Carbon fiber surface modification method and equipment, carbon fiber and its composite material and its application" invented a method of electrochemically modifying carbon fiber, which effectively improved the bonding strength of carbon fiber composite material, but electrochemical treatment is harmful to Carbon fiber does some damage

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  • Preparation method for para aminobenzoic acid lossless modified carbon fiber enhanced paper base wet-type friction material

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preparation example Construction

[0021] A method for preparing a nondestructively modified carbon fiber reinforced paper-based wet friction material with p-aminobenzoic acid, comprising the following steps:

[0022] Step 1: Soak the carbon fiber with acetone to remove the sizing agent and pollutants on the surface of the fiber. After repeated cleaning with deionized water, place it in an oven at 100°C and dry it for later use. The mass ratio of carbon fiber after drying: p-aminobenzoic acid is (1-5): (1-4) Mix carbon fiber and p-aminobenzoic acid, then add excess hydrochloric acid, heat to 60-100°C in an oil bath, then add sodium nitrite for diazotization reaction for 15-20min , wherein the molar ratio of p-aminobenzoic acid, hydrochloric acid and sodium nitrite is 2:4:1, after the reaction is completed, the carbon fiber sample is taken out, cleaned and dried to obtain the modified carbon fiber, and the carbon fiber is polyacrylonitrile carbon fiber or pitch-based carbon fiber;

[0023] Step 2: Use the wet p...

Embodiment 1

[0027] Step 1: Mix 0.5g of polyacrylonitrile-based carbon fiber with 0.4g of p-aminobenzoic acid and 0.213g of hydrochloric acid, add it into a three-necked flask, and react under the condition of an oil bath with magnetic stirring. When the reaction temperature reaches 60°C, add 0.124g Sodium nitrite was reacted for 15 minutes. After the reaction was completed, the carbon fiber was taken out and washed with deionized water and DMF repeatedly for 3 times, and then dried in an oven at 60°C to obtain the modified carbon fiber;

[0028] Step 2: Weigh 6.0 g of modified carbon fiber, 2.0 g of aramid fiber, 2.0 g of paper fiber, and 2.0 g of filler (including 1.5 g of kaolin and 0.5 g of diatomaceous earth) respectively. Then the fibers and fillers are mixed evenly by wet beating, and the friction material preform is obtained through a special suction filtration molding process, and the mass of the friction material preform after weighing and drying is recorded as W1;

[0029] Step ...

Embodiment 2

[0031] Step 1: Mix 0.4g of polyacrylonitrile-based carbon fiber with 0.3g of p-aminobenzoic acid and 0.160g of hydrochloric acid, add it into a three-necked flask, and react under the condition of an oil bath with magnetic stirring. When the reaction temperature reaches 100°C, add 0.09g Sodium nitrite was reacted for 10 minutes. After the reaction was completed, the carbon fiber was taken out and washed with deionized water and DMF repeatedly for 5 times, and then dried in an oven at 60°C to obtain the modified carbon fiber.

[0032] Step 2: Weigh 10.0 g of pretreated carbon fiber, 1.6 g of aramid fiber, 1.6 g of paper fiber, and 2.0 g of filler (including 0.8 g of quartz powder and 1.2 g of diatomaceous earth). Then, the reinforcing fiber and the filler are mixed evenly by wet beating, and then the friction material prefabricated body is obtained through a special suction filtration molding process. Weigh and dry the mass of the friction material prefabricated body and record i...

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Abstract

The invention discloses a preparation method for a para aminobenzoic acid lossless modified carbon fiber enhanced paper base wet-type friction material. Carbon fibers, para aminobenzoic acid and excessive hydrochloric acid are added to a three-neck flask, a certain quantity of sodium nitrite is slowly added after a reaction reaches certain temperature, a short-time diazo-reaction is conducted under the condition of a magnetic stirring oil bath, and carbon fibers with the surfaces grafted by benzoic acid are obtained. Then, the modified carbon fibers, aramid fibers, paper fibers, padding and resin are mixed to prepare friction material base paper, the friction material base paper is then hot-pressed and solidified, and the para aminobenzoic acid modified paper base wet-type friction material is obtained. A friction material sample is subjected to a frictional wear performance test, the dynamic friction coefficient of the sample reaches 0.12 to 0.15, the wear rate is 0.9*10<8>cm<3>/J to 1.2*10<8>cm<3>/J, the excellent frictional wear performance is shown, the technological process is simple, cost is low, and the preparation method is an efficient and environment-friendly graft modification treatment method and has the wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of a paper-based wet friction material, in particular to a preparation method of p-aminobenzoic acid nondestructively modified carbon fiber reinforced paper-based wet friction material. Background technique [0002] Paper-based wet friction material is one of the most widely used friction materials. It is a key material for wet clutches in automotive hydraulic torsion transmissions, and an important material to ensure the stability and safety of vehicles. It has the advantages of high friction coefficient, smooth and soft joint, low noise, less damage to the pair disc, and low cost, and has been widely used in various vehicles. The wet friction material prepared with carbon fiber as reinforcing fiber has excellent performance and can meet the special requirements of wet friction conditions, but carbon fiber has a significant defect, its surface activity is low, its surface is inert, lacks active functional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/50D21H15/12D21H19/24D21H23/32D21J5/00D06M13/342D06M11/65D06M101/40
CPCD06M11/65D06M13/342D06M2101/40D21H13/50D21H15/12D21H19/24D21H23/32D21J5/00
Inventor 费杰段笑黄剑锋曹丽云张超罗丹罗兰齐樱
Owner SHAANXI UNIV OF SCI & TECH
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