Method of making articles from composite

FIELD: machine building.

SUBSTANCE: proposed method comprises preparing binder directly before impregnation of fibrous filler. Epoxy-novolac binder with number-average molecular weight of 300 a.u. and weight fraction of epoxy groups of 8-11 are produced by loading 10-28 wt % of product into reactor, said product being obtained by epoxidation of hydroxyphenyl oligomer from alkyl resorcinol, 47-80 wt % of diane epoxy resin and 10-25 wt % of modifier, and by boiling at 60-250°C for 30-180 minutes. Article is shaped by drawing fibrous filler impregnated with binder and hardener via replacement die and helical winding on reinforcing bundle core.

EFFECT: higher physical and mechanical properties.

 

The invention relates to the manufacture of moulded articles made of composite polymeric materials, may be used to obtain deformed bars for reinforcing building structures used in civil and road construction. Profiled hollow parts can be used for items such as bearings, bushings, washers, bearings. Details of the profile fiberglass with high temperature resistance rectangular, round, square, trapezoidal cross-sections can be used in electrical machines, electrical equipment.

A known method of manufacturing a lengthy profile of products from composite materials according to the patent of Russian Federation №2336169, VS 55/30, 2008. The method includes directing a continuous reinforcing fibers, heating the obtained harness, impregnation his binder, the molding profile of the product by pulling the harness through a heated die plate, subsequent longitudinal-transverse winding and curing. Binder additionally contains thriftily ester of phosphoric acid. Binding on the harness put in pseudovirions condition. The disadvantage is the low resistance to high temperatures, lack of physical-mechanical parameters.

A known method of manufacturing a lengthy profile of products from polymeric whom ositioned materials on patent RF №2009037, VS 55/30, 1994. The method involves the impregnation of the binder continuous reinforcing fibers, molding profile by pulling the workpiece with spiral wound through major die plate, curing and removal of the spiral winding. Periodic profile of the product obtained by pushing the wound in the body of the workpiece while passing through the die plate. After curing and removal of the winding on the surface of the profile remains the spiral grooves. The disadvantage is the inability to manufacture products with different configuration and low physical and mechanical properties.

As the closest analogue of the claimed technical solution is chosen the invention according to the patent of Russian Federation №2381905, WV 17/04, 2009. A method of manufacturing a rod for the reinforcement of concrete includes heat treatment of the fibrous filler, the impregnation of the polymer binder based on epoxy resin, pulled through the wringer unit, forming transverse profile of the rod and curing the binder. Molding is carried out by combining threads in a single core, and spiral wound upon him, coiled cord made of twisted yarns. Curing is carried out in the mode of stepwise heating of the rough-formed rod through three heat chamber, respectively, at temperature, °C: 145-150, 190-200, 145-150. The speed of drawing is to 0.055-0.67 m/s The disadvantage is the duration of the manufacturing process of the product, lack of strength, inability to obtain products with different cross-sectional shape.

The technical task of the invention is to improve operational properties of the product.

The technical result is to increase the physical-mechanical properties of the product, degree of polymerization of the binder and in expanding the range of possible configurations of products.

The technical result is achieved due to the fact that in the method of manufacture of products made of composite material comprising the heat treatment of the fibrous filler, the impregnation of the polymer binder based on Dianova epoxy resin and hardener, pulled through the wringer unit, forming the shape of a product, curing, according to the invention pre-made epoxy-Novolac binder with srednekamennogo molecular weight of 300 $ and mass fractions of epoxy groups 8-11 loading into a vacuum reactor 10 to 28 wt.% the product, which is the structuring agent (for adhesives)obtained by epoxydecane oligomer of hydroxyproline from alterationsin with the degree of polycondensation n=0-2 at a temperature of 180-250°C, 47-80 wt.% Dianov epoxy resin and 10 to 25 wt.% modifier (alkylpiperidines ether), are mixed is of components and boiling at a temperature of 60-250°C for 30-180 min, as the mixture is injected hardener, the shape of the product to give a rough fibrous filler impregnated with a binder and a hardener, through the removable die plate and a spiral winding formed on the reinforcing rod bundle impregnated with the binder and curing agent, the curing is carried out in the mode of stepwise heating, stretching the molded product through the heat chamber with a speed of 1.5 to 6 m/min at temperatures of 80-100°C, 100-120°C, 120-150°C, then cooled in a natural way.

The technical result is ensured by the fact that in the process of manufacturing products include pre-production of the binder into the vacuum reactor. The composition is loaded into a vacuum reactor, contains from 10 to 28 wt.% the product obtained by epoxydecane oligomer of hydroxyproline from alterationsin with the degree of polycondensation n=0-2 at a temperature of 180-250°C. This product plays the role of a structuring agent (an adhesive system). Its introduction leads to a structuring polymer matrix, binder, giving it high durability, minimal shrinkage, resistance to thermal and chemical influences. The presence of hydroxyl groups in the epoxy binder promotes good adhesion of the matrix with mineral fiberglass or carbon fibers and the supporting rod with a fiber winding, which affects the appreciation is the strength of the final composite product. Thus, durability of the product is provided as increasing strength of polymer matrix binder, and a fibrous filler. In addition, the use Dianova epoxy resin in combination with a modifier (alkylpiperidines ether and the product obtained by epoxydecane oligomer of hydroxyproline from albertorio, allows the melted resin at a temperature of from 60 to 250°C, while under normal conditions Dianova epoxy resin obtained by mixing at 60°C. the temperature in the vacuum reactor allows you to speed up the process of obtaining a binder with 24 hours to 30-180 minutes, which also improves the properties of the product. Expansion of the range of possible configurations of products provided by the stretching of the fibrous filler through interchangeable dies. The cross-sectional shape of the product is determined by the form of removable dies. Durability is ensured through the use of two methods of formation - extending through the die plate and the subsequent spiral winding on the rod reinforcing braid. In addition, the physico-mechanical properties of the product increases due to the separation of the processes of molding and curing. Curing is carried out in the mode of stepwise heating and cooling, stretching the molded product through the heat chamber. Soon the be pulling a 1.5-6 m/min The optimal speed of drawing, in which are provided the best physical and mechanical properties of the product is 4-6 m/min the temperature of the furnace, through which consistently give the product, 80-100°C, 100-120°C, 120-150°C. the Optimum speed of drawing and temperature intervals stepwise heating and cooling for the manufacture of products using specified epoxy-Novolac binder determined experimentally.

A method of manufacturing articles made of composite material is as follows.

In the vacuum reactor load calculated amount of epoxy Dianova resin modifier and a structuring agent (adhesive system) - product of the epoxidation of oligomer of hydroxyproline from alterationsin. As a modifier use alkylpiperidines ether. Boiling components produced at temperatures of 60-250°C for 30-180 minutes and Then the reactor is cooled naturally. Conduct sampling to determine the following parameters: viscosity, mass fraction of solids, the content of epoxy groups. Values are entered in the passport on the batch of resin. Then in the prepared resin enter the estimated amount of the hardener are thoroughly mixed and the dispenser is served in a bath of impregnation of the reinforcing fibers. Next, roving or yarn is C basalt or carbon material or zirconium glass, taken in the estimated number served in the chamber of the annealing. Subjected to heat treatment at a temperature of 100-250°C. to remove the sizing and moisture. Then thread and harnesses come in the impregnating bath, where the wetting of roving or yarn to the optimum ratio, which is 16% to 20% by weight of roving or yarn. Pre-formed into the body of the rod, extending filaments and bundles through the wringer unit. The excess binder presses back in the tub soaking. Further impregnated strands and strands stretch through forming a removable die plate where the product blank is formed with a predetermined shape defined by the shape of the opening of this interchangeable dies. Routing roving and yarns carried out by means of the pulling device. Combine the reinforcing strands and the strands in a single product, holding a corner-tangential spiral winding formed of a rod reinforcing braid. The winding also carry glass, basalt, carbon fibers or filaments of zirconium glass, or a bundle with a diameter of 1-5 mm and a pitch of braid 1-15 mm, twisted of these threads. Then the rod with the resulting final configuration stretch through the heat chamber, where the curing of the workpiece in the mode of stepwise heating at a temperature of 80-100°C, 100-120°C, 120-150°C. the Speed of drawing of 1.5-6 m is in a minute depending on the diameter and configuration of the product. Then cooled in a natural way. Then automatically cuts the finished product. The rod is cut to the required length in the form of products of various cross-section shapes, such as rectangular, trapezoidal, circular, semi-circular, segmental. Appearance is a part of some form of periodic profile due to the angle of the tangential winding with a given step, with smooth shiny surface without cracks and chips.

When using a binding offer of composition made immediately before the impregnation process, with specified thermal conditions and at a specified speed curing occurs more complete polymerization of the binder in the composition is at least 100±0,2%.

The product, obtained as described, have improved physical and mechanical properties. Ultimate tensile stress tensile reinforcement is on the roving of glass "E" not less than 1500 MPa, from roving on basalt glass - at least 1660 MPa, modulus of elasticity, respectively, is at least 75 GPA and at least 90 GPA, the water absorption of 0.3 wt.%, heat 250°C.

Thus, the invention allows to significantly improve the properties of products made of composite polymeric materials and to expand the range of the obtained configurations that EC increases the operating characteristics of products and opens new areas of application.

The method of manufacture of products made of composite material comprising the heat treatment of the fibrous filler, the impregnation of the polymer binder based on Dianova epoxy resin and hardener, is pulled through the wringer unit, forming the shape of a product, curing, wherein the pre-made epoxy-Novolac binder with srednekamennogo molecular weight of 300 $ and mass fractions of epoxy groups 8-11, for this loaded into a vacuum reactor 10 to 28 wt.% the product obtained by epoxydecane oligomer of hydroxyproline from albertorio, 47-80 wt.% Dianov epoxy resin and 10 to 25 wt.% modifier, and spend the components are mixed and cooked at a temperature of 60-250°C for 30-180 min, the resulting mixture is injected hardener, the shape of the product to give a rough fibrous filler impregnated with a binder and a hardener, through the removable die plate with subsequent spiral winding formed on the reinforcing rod bundle impregnated with the binder and curing agent, the curing is carried out in the mode of stepwise heating, stretching the molded product through the heat chamber with a speed of 1.5 to 6 m/min at temperatures of 80-100°C, 100-120°C, 120-150°C.



 

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