A classification of the processing of an aramid cable

Aramid fiber cable has high strength, high modulus and high temperature resistance and other excellent properties, five or six times that of steel wire on its strength, modulus of steel wire or fiber glass of 2-3 times, toughness is 2 times of wire. The high performance of the fanglun cable also causes the difficulty of processing. Because the fanglon cable can't melt, the already industrialized several kinds of fanglon cable product, can not make the injection molding, extrude, can only be processed in solution. And in solution state processing, it can only take spinning, film and so on. The most common way to process a piece of Arlen rope is to spin it into a filament, or to cut short fibers through the pulp and filament. Filament, such as pulp fiber products, field of application is relatively narrow, in order to obtain a wider range of application, better play to the excellent properties of aramid fiber cable and further processing. If the filament is used as the skeleton material in composite materials, but further processing, weaving the cable, spinning, and so on, the application is more extensive; Short fibers can be used for injection molding and composite materials, and the application is more likely to be applied after the paper is copied. In order to better describe the processing of aramid, we grade the processing of the aramid, to facilitate the detailed analysis.

The first level of the aramid rope

The products are processed directly by aramid raw materials, which can be called first-class processed products, such as spinning filament and the pulp of the reaction.

Initially, is the first synthetic resin, synthetic polymer dissolved in concentrated sulfuric acid, again, adjust the appropriate concentration crystal solution, until heated to a definite temperature and extrusion, stretching, solidification, washing, neutralization, drying, winding, aramid filament. This is a two-step spinning process. Later, scientists found that through the experiment in the amide class solvent + cosolvent such as lithium chloride is obtained by polymerization at low temperature in the reaction liquid, this kind of reaction liquid filtration, spinning, solidification, washing, hot stretching aramid filament can be obtained directly, this is a one-step polymerization process. The spinning process can be divided into dry, dry-wet and wet spinning. Dry-wet and wet spinning require a solid bath, so a complex solvent recovery system is required. And dry spinning USES hot air to blow out solvents, reaching the fibre solidification.

Aramid filament in the process of wire surface modification can be done, such as dupont, using magnetron sputtering technology, the metal sputtering form thin film in the surface of aramid fiber, antistatic effect, not only so can high frequency radiation shielding and the signal at the same time.

An arron or parallel monofilament cluster can be made into a non-twist roving, and the single filament diameter of the fibers used in the production of roving fibers varies from 5 to 15 mu m. The number of non-twist roving is from 100-8000 Dan. The non-twist roving can be used directly in the process of forming of certain composite materials, such as special textile, pre-dip, pipe winding, extrusion and so on. It can also be further woven into non-woven roving and special aromas, used in special industries such as aerospace, defense, and military industry.

Solution polymerization at low temperature has certain viscosity of polymer dope, after being reaction system in gel, stop stirring, to join the precipitant, frozen gel was damaged, the original fiber polymer precipitation are gathered. This kind of raw fiber aggregate polymer is formed by crushing, neutralizing and washing to form a certain length ratio, a certain length distribution of pulp short fibers.

The filament is cut, made into short fibers, and then processed on the surface to make its hair feathering and the pulp of the pulp. Pulp short fibers of this approach is through the filament of primary processing products, should belong to the secondary product, but on the product performance and pulp of short fibers of the former method, there is no essential difference, in order to facilitate analysis, the pulp of this method, the short fibers are classified as primary processing.

2, the secondary processing of the fanglun cable

The secondary processing of aramid cables is further processed on the basis of the first order processing products. The aramid filament and pulp staple are first class processed products, which can also be processed in secondary processing.

Aramid filament and other fibers filament, can be used in textile, adopt the method can be knitted, woven, can weave two-dimensional plain, twill, satin weave, rib, lines, and also can weave three-dimensional solid fabric. Aramid filament yarn with wool, cotton and other natural fiber and chemical fiber and blended, both to keep the characteristics of aramid fiber, can also reduce cost, increase the fabric dyeing properties. It is also possible to make weft and cord fabrics with the use of aramid fibers and resins

In addition to weaving cloth, the filament can be woven directly into the products that can be applied. Such as knitting a protective glove, weaving a piece of fanglon cable, or by weaving, surface coated polytetrafluoroethylene and lubricants, as sealing materials.

Pulp short fibers can be used to writing and manufacturing non-woven fabric, beating their specific process is divided into fiber, dispersion, writing paper, drying, hot pressing, etc., are mainly producing the paper between the bit and para aramid paper.

The paper has good strength and excellent thermal performance and insulation. A between aramid can use for a long time without aging at 220 ℃ high temperature, the electrical properties and mechanical properties can keep ten years, and excellent dimensional stability, at about 250 ℃, the heat shrinkage rate is only 1%; A short period of time will not shrink from 300 ℃ high temperature exposure, embrittlement, soften or melt; Under the strong temperature of more than 370 ℃ began to break down; Around 400 ℃ before carbonization. Between aramid dielectric constant is low, the dielectric strength inherent in the high temperature, low temperature and high humidity conditions can maintain excellent insulation, with its preparation of insulating paper resistant to breakdown voltage can be up to 100000 v/mm, is the world recognized the best insulating materials. Aramid limit oxygen index greater than 28%, that is, when the oxygen in the air is more than 28% can burn, and the actual air oxygen content is 20%, so as not to burn in the air, also not combustion, has the self-extinguishing, flame retardancy is very good. The strength and thermal properties of the aramid are better, but they are also more expensive, so they are more often used for higher requirements.

3, three-level processing of aramid rope

The tertiary processing of the Arlen rope is further processed on the basis of the secondary processing product. The secondary processing products of aramid are aramid and aramid paper, similar to the cloth and paper we commonly use, which is helpful for further processing of the available products.

If it is a cloth, it can be processed like cloth, such as making clothes, or other cloth products. Aramid can also be used as a skeleton for composite materials. Aramid heat resistance is very high, and between aramid when encountered some strong 900-1500 ℃ temperature, cloth quickly and thickening of the carbide, formed a unique insulating barrier, fire prevention effect is very outstanding. As a result, the clothing made by aramid was first used as a fire service. At present, a variety of colors and styles of fire fighting clothing made from the domestic aramid fibers have begun to be constructed to equip our country's forest police and fire fighting forces.

In addition, the further processing of aramid paper can be made into paper honeycomb. The properties of aramid are excellent, the structure weight of the honeycomb is light and maintains the mechanical properties and thermal properties of the aramid, and the suction efficiency is high, which can greatly reduce the noise pollution. As a result, the honeycomb is widely used in aerospace, railway and other high-end decoration. Our country is vigorously developing large aircraft and large military transport aircraft, aircraft materials today has entered a high modulus, an era of composite materials, the plane's advanced greatly the above-mentioned now the use of composite materials. The high requirements for safety, economy, comfort and environmental protection have determined the high demand for composite materials. The honeycombed paper honeycomb structure, which is a high performance lightweight aviation material used in foreign aircraft, must be taken seriously. With six big speed, the railway has been into the electrification of China railway high-speed train times, mu trains become the main models of fast passenger rail, high-speed rail has been built. Is very tall to the requirement of high speed train of vehicle lightweighting, aramid fiber honeycomb and other new type of lightweight structural materials because of their excellent comprehensive performance, also will be more widely applied in high-speed trains.

In addition, the aramid paper also can be flexible insulation material is obtained and polyester thin film adhesion, namely flexible with polyester film and excellent dielectric properties, and keep the aramid paper insulation, heat resistance, thermal conductivity, tensile strength, can be used as heat resistant F and H class insulation.

The application of the aramid cable

It has excellent performance, making it more widely available in almost every industry in the national economy. In order to better, summarized the application of aramid fiber, segmentation, using the theory of set up in front of the aramid fiber processing classification, analyzes the application of aramid fiber, is shown in table 1.

Table 1:

Table 1: the processing and application of aramid

Processing and classification

Processing form

Product function type

Application field

Primary processing

filament

Reinforcing material

Fiber optic reinforced core and armor, indoor fiber optic cable and ADSS power cable

Rubber products such as tyre, conveyor belt, rubber pipe and cable

In other composite materials

Fine meal

Reinforcing material

Instead of using fiberglass for injection molding, etc

Friction material

Substitute asbestos for clutch lining, brake lining, etc

The secondary processing

Aramid cloth

Reinforcing material

Body armor, bulletproof armor, etc

It is used for strengthening and repairing Bridges and buildings

High temperature filtration material

It is widely used in the filtration of high temperature flue and hot air in chemical, cement and smelting industries

Aramid paper

Insulation materials

Transformer, motor coil winding, interphase, interturn, line terminal insulation material. Printed circuit board, etc.

Flame retardant materials

Film theater, hotel and other public facilities such as curtain, wall paper, spotlight insulation fire retardant material. Used for insulating fire retardant materials such as aerospace and railway. Thermal insulation materials, spark plugs, heat-resistant hoses and other heat-protective materials, radiation hose flame retardant materials.

Through materials

The aircraft, missile, and satellite wideband permeable materials are applied to the radar antenna cover and the enemy identification device.

Filtering material

It is widely used in chemical, cement, smelting and other industries such as high temperature flue, hot air filtration and other special environment such as high temperature and corrosion.

Other aramid fabrics

Reinforcing material

Aramid gloves etc.

The rubber cord is used for tyre and hose

Aramid fiber cables.

Sealing material

Aramid fiber packing

Level 3 processing

Clothing etc.

Insulating fire retardant material

Fire protection and fire blanket

Paper honeycomb

Structural materials

Structural materials such as wings, cabin doors, fairing, etc.

High speed trains, yachts, boats, and other high performance requirements

Lining board, floor, partition wall and so on high-grade decorate material

Through materials

Aircraft, missiles, and satellite broadband penetration materials

Four, outlook

Since the reform and opening up, China's economy has come a long way, and people's technology and cultural needs are getting higher and higher. Especially with the increasing safety awareness of the Chinese people, the excellent characteristics of aramid are more applied in high performance or safety protection. Fanglon is closely watched because of its excellent performance, which makes its application more extensive. Believe that with the development of new technologies, new techniques, new equipment, aramid fiber, a former used in military industry, aerospace and other high-end industry "Wang Xietang former yan," will be "flying off the shelves," more deeply into our daily life, become the common product, better protect our life and property safety, better serve the people.

Binzhou Hengfeng Chemical Fiber Products Co., Ltd. is located in Lizhuang Town, Binzhou City, 90 km away from Jinan City, Yaoqiang Airport, 300 km from Beijing and Qingdao Port. The location is convenient and the transportation is convenient.

The company registered trademark "Hengfeng", the main products include: high-strength polypropylene filament, polypropylene color silk; ship, maritime sea rope; security, climbing climbing, fire rescue escape rope; aerospace, military equipment rope; , Spreader products. The company has the most advanced domestic polypropylene spinning machine, three stranded rope machine, eight shares and 12 shares of rope machine, knitting machine, rope test equipment. Leading technology, the strength. Product variety, the whole specifications,