Coated glass thread for reinforcing polymer materials

FIELD: chemistry.

SUBSTANCE: present invention relates to glass threads for reinforcing polymer materials. The glass threads are coated with an aqueous sizing composition containing adhesive film-forming components in form of a mixture of at least one polyvinyl acetate and at least one polyvinyl pyrrolidone, wherein the at least one polyvinyl acetate makes up 70-90% of the weight of solid substance of the mixture. Also, the aqueous sizing composition contains (in wt % in terms of weight of solid substance) 0.1-5 polyvinyl pyrrolidone, 6-20 plasticiser, 3-9 sizing agent, 2-7 combination agent and 0-5 antistatic agent. The obtained glass threads are used as reinforcement when making moulded articles containing a thermosetting matrix, obtained by moulding with spraying of said threads and resins, especially moulding long threads using an injection technique.

EFFECT: prevention of kinking of the thread after unwinding and ensuring integrity of the thread (preventing separation into fibres) after cutting.

15 cl, 1 ex, 1 tbl

 

This invention relates to glass fibers, which are coated on the basis of the sizing composition and which are intended for reinforcement of organic materials polymer type, sizing compositions used to produce coatings on these threads, and to the thus obtained composite materials, especially made by molding.

Glass yarn, used for reinforcement, usually obtained on an industrial scale from a stream of molten glass, leaving many holes in filiere. Such jets mechanical stretch in the form of continuous filaments, then they gather together in the main thread, which are then collected, for example, by winding onto a rotating reel. Before the fibers are gathered together, they cover the dressing material for composition by passing them over a suitable device such as rollers for coating.

Dressing material for composition is very important for several reasons.

During the manufacture of the reinforcing threads dressing material for the composition protects the glass fibers from abrasion, which occurs when they are rubbing with a high speed about the different parts are used for their direction and collection. It also provides communication between the fibers, leading to cohesion of the filaments. Since the thread compound is obtained, with nalegke contact, especially during weaving, thus it is possible to avoid breaking the thread.

During the manufacture of composite materials dressing material for the composition promotes wetting and impregnation of glass fibers reinforcing a matrix, this matrix is usually applied in the form of a fairly liquid resin. While the mechanical properties of the final composite material is significantly improved.

Materials that need to be reinforced may include glass yarn in various forms: continuous or chopped strands, continuous or chopped mats, fabrics, etc.

Composite materials that contain chopped glass strands, can be obtained, among other ways, by a method of forming a spray, which is sprayed resin, the reinforcement of which is produced, and glass fibers of different lengths in the form. Filament and resin are sprayed together on the inner wall of the form using the "spray", which includes chopper, capable to cut threads, extruded from one or more packages, and a device for spraying resin. This method, which is simple and scalable, especially suitable for the manufacture of single and small scale products based on thermosetting polymers belonging to the class of polyesters and epoxy resins.

A specific method of manufacturing a composite method is ω molding spray known as the "technology of long fibers" (LFI). He is simultaneously sprayed in the form of chopped strands with high speed (about 300-1200 m/min) cycles lasting tenths of a second, and reactive monomers capable of forming the resin during curing and then use the response section of the form. This technology is particularly suitable for the manufacture of products made of polyurethane, especially for vehicles, for example, inner door panels, shelves, racks, instrument panels and roofs.

The quality of the composites obtained by these methods largely depends on the properties that provide the glass filaments, and therefore, from the dressing, which is contained in them, and machining conditions. In particular, the right dressing material for compositions that provide a filament which can be extracted from the package, such as a cake or roving, in the formation of a minimum number of possible loops, and which maintains its integrity after cutting. The loops are undesirable for the following reasons:

firstly, loops prevent the passage of the thread inside the flexible arm, which is used for cutting threads and for spraying the specified thread in the form. The operation of the chopper becomes unsatisfactory, does not deliver a constant quantity of chopped glass in the form;

in addition, high voltage, at which the away thread at the beginning of each cutting cycle, calls "filamentation" thread in the loops, i.e. rupture of the fibers forming the yarn, together with the advent of "crushed"that accumulates on the different phases of the process. Separated from the chopper, crushed form in the resin bundles, which degrade the quality of the molded product.

In any case, the performance decreases due to downtime required for cleaning contaminated items.

It is also desirable that the integrity of the thread was kept in a high degree that it "was not disclosed when the separation of the fibers which compose it, in the beginning of each cutting cycle, when the yarn tension is high. But it is also necessary that the fibers remained United together after cutting, to cut thread can perform its role as a reinforcement of the matrix in the finished product.

Improvement of these properties should not be at the expense of other properties. In particular, it is important that the thread had a "slip" so that it can easily unwind or uncoil from the package without the high voltage associated with the risk of damaging the threads, but at the same time was hard enough, so it can be cut in suitable conditions.

It is also necessary that chopped the thread would quickly be impregnated with the initial monomers forming the resin, and to the resulting mixture was homogeneous and evenly the distribution is authorized in the form, without the "destruction" under the influence of gravity.

Litvanya glass yarn, suitable for the implementation of these methods of forming the spray, is already known.

In the application EP-A-0869927 described glass yarn which has a floor-based dressing material for composition, comprising as an adhesive film-forming agents, a combination of at least one polyvinyl acetate And low molecular weight and at least one samoszhimayuschihsya by heating a copolymer of vinyl acetate In the weight ratio a/b greater than or equal to 1. These threads are characterized by a high rate of impregnation of resin.

In the application WO-A-02/059055 glass filaments are coated water-based dressing material for the composition, which contains at least one bis-silane and at least one unsaturated monosilane, selected from vinylsilanes and methyl(acrylicana). Dressing can increase the service life of the blades of the chopper, the Rate of impregnation of the filaments is also high.

In the application FR-A-2279688 glass filaments contain floor-based dressing, which is an aqueous mixture on the basis of polyvinyl acetate, sizing based on fatty acids, methacrylamide and γ-(Ethylenediamine)propyl-trimethoxysilane.

Although the characteristics of these threads in General are satisfactory, the number of loops per unit length of the bat is still large and integrity is poor.

The purpose of this invention is to obtain a reinforcing glass filaments, designed especially for molding by sputtering, in particular, the method LFI, which forms few loops when removing this thread from the package and which has greater integrity than the known yarn used for this type of molding.

This invention relates to glass strands coated with water-based dressing material for composition as an adhesive film-forming agent comprises a mixture of: at least one polyvinyl acetate and at least one polyvinylpyrrolidone.

According to this invention, the term "glass yarn coated-based dressing material for the composition, which contains..." means not only the glass filaments with a coating based on a specified composition, such as obtained immediately upon exit from the device or devices for smoothing, but also the same thread after they have been subjected to one or more types of processing. For example, we can mention the drying operation designed to remove the liquid phase from the composition, and processing, resulting in solidification/merging some of the components of the dressing material for composition.

Still in the context of this invention, the term "fiber" should be understood as meaning the main thread, the resulting set together is noreste fibers under villeroi, and the products derived from these threads, especially the set of these major strands in the form of rovings. Such kits (Assembly) can be obtained by simultaneous reeling from several packages of basic wound threads and then they are assembled together in the rovings are wound on a rotating holder. Such assemblies can also be a direct rovings which have a linear density (or mass per unit length), the equivalent density of the assembled rovings obtained by a joint Assembly of fibers directly under Villeroy and winding them on a rotating holder.

In accordance with the invention, the term "water-dressing material for composition" means dressing material for the composition in the form of a solution in which the liquid phase consists of 97%, preferably 99%, and even more preferably from 100% by weight of water, the rest is (if the water is less than 100%) one or more organic solvents, which may contribute to the dissolution of some components of dressing material for composition.

In General, dressing material for the composition contains from 85 to 95%, preferably from 89 to 94% by weight of water.

According to this invention dressing material for the composition contains as an adhesive film-forming agent mixture, at least one of polyvinyl acetate and at least one polyvinylpyrrolidone.

Polivi ylacetic is important for to quickly achieve a high degree of impregnation of the fibres with resin and to provide a good mixture according filament/resin form. The polyvinyl acetate is also attached filament stiffness.

Molecular weight polyvinyl acetate is usually less than or equal to 80000 g/mol., preferably less than or equal to 70000 g/mol. and preferably is in the range between 29000 and 65000 g/mol. The amount of polyvinyl acetate is usually from 70 to 90%, preferably from 75 to 85% by weight per the solid dressing applied to the thread.

Polyvinylpyrrolidone is involved in the formation of links between the glass fibers, thereby enabling to increase the integrity of the threads after cutting, and in addition, helps to regulate the sticky threads and reduce the ability of the thread to form a loop.

The molecular weight of the polyvinylpyrrolidone is usually less than or equal to 4000 g/mol., preferably, less than or equal to 3000 g/mol. and, mainly is in the range from 1000 to 2000 g/mol.

In dressing the amount of polyvinylpyrrolidone is such that the weight ratio of polyvinyl acetate to the polyvinylpyrrolidone varies from 14 to 900, preferably from 18,75 to 106,25.

In addition to the above components, which essentially make up the structure of the dressing, the dressing material for the composition may contain one or more other components of the Sabbath. Ltd (hereafter referred to as "additives").

Dressing material for the composition may thus contain at least one plasticizer, which contributes to a more flexible polymer chains adhesive film-forming agents. Contributing to the lowering of the glass transition temperature of the binding agent, plasticizer creates the opportunity for the best "prelevement a mixture of chopped strand/resin in the mold of a complex configuration. Typically, the plasticizer is selected from derivatives of glycol, such as dibenzoate of alkalophilus, preferably of dibenzoates ethylene and/or propylene glycol.

The amount of plasticizer in the dressing depends on the degree of flexibility, which is desirable to give the thread, knowing that the thread should be sufficiently rigid in order to be properly distributed in the resin. Typically, the plasticizer comprises from 6 to 20% by weight of solids dressing.

The composition may also contain at least one lubricant in an amount of from 3 to 9% by weight solids dressing material for composition. In addition, performing the role of protecting the fibers from mechanical abrasion, sizing helps to limit the formation crushed and prevents bonding of the turns of the threads in the packages.

Typically, such agents are selected from cationic compounds of the type of polyalkylimide and ionic compounds, fatty acid type polyaxial novogo complex ester polyalkyleneglycol, such as monolaurate of polyethylene glycol or fatty acids and polyoxyalkylene, such as gidrirovannoe tall oil and polyethylenimine.

Dressing material for the composition can also contain at least one agent combinations, which allows the dressing to be associated with the surface of the fibers. Agent combination is usually selected from silanes, such as γ-glycidoxypropyltrimethoxysilane, γ-acrylonitrilebutadiene, γ-methacryloxypropyltrimethoxysilane, poly(oksietilenom/oxypropylene)trimethoxysilane, γ-aminopropyltriethoxysilane, VINYLTRIMETHOXYSILANE, phenylaminopyrimidine or stearamidopropylammonium, siloxanes, titanates, zirconate and mixtures of these compounds.

Preferably choose silanes.

The number of agent combination is usually less than 7%, preferably higher than 2% and most often is about 5% by weight solids dressing material for composition.

Dressing material for the composition can also contain at least one antistatic agent, which enhances the ability of glass yarns for cutting. The antistatic agent is selected from salts of metals, such as lithium chloride. The amount of antistatic agent is usually the largest 5% by weight solids dressing.

All such supplements help to get the reinforcing threads, which can easily p is otvoditsya, without difficulty be removed from the packages of yarn with a reduced number of loops that can be without any problems slashed and sprayed into the mold, at the same time maintaining good integrity.

In accordance with the present invention, the thread may be subjected to a further processing stage to inflict additional dressing ("thread re-layer dressing") to give the thread the best sliding properties and reduce the level of electrostatic charge, which creates better conditions to obtain chopped strands. The use of threads with the re layer of the dressing is advantageous in the case when dressing material for the composition does not contain any antistatic agent. Then the thread with the re layer of the dressing contains as an antistatic agent, at least one Quaternary ammonium salt. As a General rule, the amount of second layer is from 0.02 to 0.2%, preferably from 0.05 to 0.10% by weight of thread.

Thread made of fiberglass, covered with a dressing material for the composition, in accordance with the present invention has reduced by 3% loss when ignited, preferably less than or equal to 2%, preferably to a decrease in the loss on ignition was more than 1.25% and better still would be in the range of 1.3 to 1.7%.

Most often strands of fiberglass in accordance with the present invention náchod is conducted in the form of packages of the main thread, which are subject to heat treatment. Essentially, this treatment is intended to remove the water that was in the dressing material for composition and, when necessary, it accelerates the cross-linking adhesive film-forming agents. The processing conditions may vary depending on weight of package. In General, drying is carried out at a temperature of from about 110 to 140°C for several hours, preferably for 12 to 18 hours

Yarn, coated with dressing material for the composition in accordance with the present invention, can be obtained from the glass of any type, provided that it is capable of fiberizing, for example, from E-glass, S-glass, AR-glass (resistant to alkalis) or glass with low boron content (less than 5%).

The same threads are obtained from fibers whose diameter may be within wide limits, for example, from 10 to 20 μm, preferably from 11 to 16 μm. Preferably such yarns have a linear density of between 30 and 200 Tex., more preferably between 50 and 160 Tex.

Another object of the present invention relates to water-dressing material for the composition, which can form a coating on the above filaments of glass, which is characterized by the fact that it includes the following components, expressed in the following amounts in weight percent of solids:

from 70 to 90%, preferably from 75 to 85%, of at least one of polyvinyl acetate;

from 0.1 to 5%, preferably from 0.8 to 4%of at least one polyvinylpyrrolidone;

- from 6%to 20%, preferably from 7 to 15%, of at least one plasticizer;

- from 3 to 9%, preferably from 3.5 to 6.5%of at least one lubricant;

- from 2 to 7%, preferably from 3.5 to 6 %of at least one agent combinations;

- from 0 to 5%of at least one antistatic agent.

Preferably dressing material for the composition contains a solid substance in amounts of between 5 and 15%, preferably from 6 to 14% and even more preferably from 8 to 12% of its weight.

Dressing material for the composition is obtained by simple mixing of the above components and water. When agent combination is silane, the silane first passes through a stage of hydrolysis in the presence of acid.

Another object of the present invention relates to composites containing filaments of glass, covered with a dressing material for composition. These composites contain at least one thermosetting material, preferably a complex polyester, vinyl ester, acrylic polymer, polyurethane, phenolic resin or epoxy resin and glass strands obtained wholly or partly, of yarns of glass in accordance with the present invention.

The content is of glass in the composite is typically between 20 and 45%, preferably between 25 and 35% by weight.

Another object of the present invention is the use of filaments of glass, covered with a dressing material for the composition, for production of a composite material by applying molding technology with spray, especially technology LFI.

The following examples illustrate the present invention without any limitation.

Properties related to the filaments of glass, covered with a dressing material for the composition was measured as follows:

- loss when ignited slikovnih of filaments of glass, in percent, measured in accordance with ISO 1887;

the number of loops was measured by twisting strands of the roving in a length of 500 m and passing it between two optical sensors that detect the defects. The number of hinges indicated at 1 kg yarn;

- crushed was measured by passing through a rotary swath 0.5 kg of yarn, wound from the roving at a speed of 80 m/min and determine the mass of fibrils obtained during the passage. Crushed indicated in mg/kg yarn;

the half - decay time (decay) of the charge (in seconds) was calculated based on measurements of the electric field, obtained by applying a static voltage to the filament, placed in a static chamber at a temperature of 20°C and a relative humidity of 20%;

- the integrity of the filaments was measured by the amatively thread in chopper WOLFANGEL, at a speed of 1200 m/min, without splitting, and by monitoring external form of a filament in accordance with the scale of values, in the range of 1, which means bad, the integrity of the filament is broken, the main individual threads, to 5, which means very good, the whole thread;

- the integrity of the threads after cutting was measured in the following way: the thread extending from the roving, was introduced in chopper WOLFANGEL 500 to be cut, and sprayed it mostly horizontally on a vertical wall (speed cutting of 1200 m/ min; length 12 mm). The integrity of the chopped strands was determined visually according to the following scale values: 1 - bad, the appearance of pellets; 3 - medium, the appearance of hairs; 5 - very good, no crushed by a thread.

Example

Dressing material for composition was obtained in the form of an aqueous solution containing (in weight percent) on the solid is:

- adhesive film-forming agents:

polyvinyl acetate with a molecular weight of 50000(1)80

- polyvinylpyrrolidone, molecular weight 1200-2000(2)3,75

agent combinations:

- γ-methacryloxypropyltrimethoxysilane(3)1

- aminosilane(4)4

- plasticizers: a mixture of dibenzoate diethylene glycol and dibenzoate dipropyleneglycol (weight ratio 50/50)(5)7,45

- sizing:

- polietilene with free amide functional g is uppy (6)3,8

- water: sufficient quantity to obtain 100 ml of a dressing material for composition.

Dressing material for the composition obtained in the following way.

Metoxygroup silanes(3)(4)were hydrolyzed by adding acid to constantly stir the aqueous solution of silane. Other components were then introduced, still under stirring, and the pH, if necessary, regulated to a value of 4±0,2.

The weight content of solid substances in a dressing material for the composition was equal to 9.9%.

Dressing material for the composition used for coating in a known manner single fibers of E-glass with a diameter of 12 μm, which were pulled from glass filaments coming out of the holes in filiere; individual fibers were then collected together in the form of packages of basic yarns having a linear density of 57 Tex.

The package was then dried at a temperature of 130°C for 12 hours.

The main strands extruded from the 6 packs were assembled together to form a roving.

The decrease in losses during the ignition of the thus obtained filaments amounted to 1.4%.

The Table below lists the results of measurements made on the threads in accordance with the present invention, and shown as examples, and on a thread that is acceptable to technology LFI moulding (sold under the brand ME 1020, manufactured by the firm of Owens Corning), which was covered with what dressing on the basis of polyvinyl acetate, used as a reference.

Table
ExampleStandard
The number of loops / kg thread4060
Crushed (mg/kg thread)1112
The half-decay time of the charge (s)12
The integrity of the thread3,52,5
The integrity of the chopped strands4,43

The Table shows that the thread on the example according to the present invention has better properties than the reference thread with an equivalent amount of crushed and is equivalent to half-decay time of the charge, and it has fewer loops and great integrity before and after logging.

(1) sold under the name RHODOPAS® 1865, manufactured by Rhodia;

the solids content is 54%;

(2) sold under the trademark LUVISKOL® K90, produced by BASF, the solids content is 20%;

(3) the sale is conducted under the name SILQUEST® A174, manufactured by GESM, the dry matter content of 70%;

(4) sold under the trade name SILQUEST® A1128, manufactured by GESM, the dry matter content of 50%;

(5) sold under the trademark of K-FLEX® 500, manufactured by a Noveon, a solids content of 100%;

(6) sold under the brand name EMERY® 6717 produced by the company Cognis, the solids content is 100%.

1. Glass yarn for the manufacture of composites by the method of forming spray, covered with water dressing material for a composition comprising the adhesive film-forming agent, which contains a mixture of at least one of polyvinyl acetate and at least one polyvinylpyrrolidone, at least one polyvinyl acetate is from 70 to 90% by weight solids dressing.

2. Glass yarn according to claim 1, characterized in that the weight ratio of the polyvinyl acetate/polyvinylpyrrolidone is from 14 to 900, preferably from 18,75 to 106,25.

3. Glass yarn according to claim 1, characterized in that the polyvinyl acetate has a molecular weight of less than 80,000 g/mol., preferably less than 70000 g/mol., between 29000 and 65000 g/mol.

4. Glass yarn according to claim 1, wherein the polyvinylpyrrolidone has a molecular weight of less than or equal to 4000 g/mol., preferably less than or equal to 3000 g/mol., between 1000 and 2000 g/mol.

5. Glass yarn according to claim 1, the tives such as those what is the loss when the ignition is less than 3%, preferably less than or equal to 2%.

6. Glass yarn according to claim 5, characterized in that it has a loss when ignited more of 1.25%, preferably between 1.3 and 1.7%.

7. Glass yarn according to claim 1, characterized in that the dressing material for the composition further comprises at least one plasticizer selected from derivatives of glycols, such as dibenzoate of alkalophile.

8. Glass yarn according to claim 1, characterized in that the dressing material for the composition further comprises at least one lubricant selected from cationic compounds of the type of polyalkylimide and ionic compounds of the type polyaminopolycarboxylate esters of fatty acids or type of fatty acid and polyoxyalkylene.

9. Glass yarn according to claim 1, characterized in that the dressing material for the composition further comprises at least one agent combinations selected from silanes, siloxanes, titanates, zirconates and mixtures of these compounds.

10. Water dressing material for the composition used for coating the glass strand according to one of claims 1 to 9, characterized in that it contains the following components in the following weight quantity per weight solids:
70-90%, preferably 75-85% of at least one polyvinyl acetate;
0.1 to 5%, preferably 0.8 to 4% less than the least one polyvinylpyrrolidone;
6-20%, preferably 7-15% of at least one plasticizer;
3-9%, preferably 3.5 to 6.5% of at least one lubricant;
2-7%, preferably 3.5 to 6% of at least one agent combination; and
0-5% of at least one antistatic agent.

11. Dressing material for the composition of claim 10, characterized in that it contains from 5 to 15%, preferably 6-14%, most preferably 8-12% by weight of solids.

12. Composite material containing at least one thermosetting polymeric material and a reinforcing glass filaments, characterized in that some or all of the glass threads are threads in one of claims 1 to 9, and thermosetting material is a complex polyester, vinyl ester, acrylic polymer, polyurethane, phenolic resin or epoxy resin.

13. Composite material according to item 12, characterized in that the content of the glass is from 20 to 45%, preferably from 25 to 35% by weight.

14. The use of glass fibers according to one of claims 1 to 9 for the manufacture of composite materials.

15. The application 14, the method according to the technology of injection of long fibers.



 

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20 cl, 5 ex, 14 dwg

The invention relates to the manufacture of lightweight products used as blocks buoyancy in deep technical means

The invention relates to a thread made, filled with filler profiles obtained by the manufacturing process vodnoozdorovitelnogo composite material, and device for manufacturing such profiles

FIELD: modified polymeric material with particles of boehmite, boehmite material and method for formation of extruded product.

SUBSTANCE: the modified polymeric material contains a polymeric substructure and particles of boehmite. The particles of boehmite represent needle-shaped particles having a shape factor making up at least about 3:1, where the shape factor represents a ratio of the largest length of the particle and its largest width, the largest size of the boehmite particles is within 50 to 2000 nm. The method of formation of the extruded product consists in the fact that first is prepared the modified polymeric material from a polymeric substructure and particles of boehmite. Then the material is extruded, the boehmite particles being dispersed in the extruded product.

EFFECT: improved modulus of elasticity, flexural modulus, safekeeping modulus, tensile strength, deformation temperature of extruded product.

20 cl, 5 ex, 14 dwg

FIELD: construction, particularly structural elongated elements designed for load-supporting and built-up from parts of different materials.

SUBSTANCE: constructional member comprises reinforcing frame 1 defined by profile walls 5, 6. Profile walls 5, 6 are connected with each other by bridges 7, 8 so that at least one longitudinal cavity 9 and four interconnecting elements are created. The interconnecting elements are adapted for profile walls assemblage in different planes. The first interconnecting elements have female contact surfaces 12, 13, the second ones have male contact surfaces 16, 17. The male contact surface dimensions are equal to that of the contact surfaces 12, 13. The contact surfaces are provided with longitudinally directed fixing parts 19, 20 and 21, 22 having profiles formed so that profile outlines mate each other in pairs. Fixing parts 19, 20 and 21, 22 are integrally made with corresponding male 16, 17 and female 12, 13 contact surfaces of material having structure equivalent to that of profile wall 5, 6 material. Female contact surfaces 12, 13 including fixing parts 19, 20 are spaced apart equal distances α=0.1-3 mm from male contact surfaces 16, 17 having fixing parts 21, 22. In accordance with one embodiment one profile wall has through longitudinal slot. In another embodiment reinforcing longitudinal bridge is formed inside longitudinal cavity. The bridge has arbitrary profile and is supported by bridges or by one bridge and one profile wall or by one profile wall made of reinforcing material with volume content equal to reinforcing material of profile wall.

EFFECT: provision of stable physical and mechanical properties of constructional panels composed of above constructional members and improved construction panel assemblage and fastening.

68 cl, 44 dwg

FIELD: chemical industry; other industries; method of manufacture of the fiber reinforced articles on the basis of the epoxy resin.

SUBSTANCE: the invention is pertaining to the method of manufacture of the fiber reinforced articles on the basis of the epoxy resin. The technical result of the invention is development of the method of manufacture according to the cast pressing resin technology of the articles with the exclusively high impact elasticity and at that without any effect on their others mechanical or thermal characteristics. The technical result is attained in the method of manufacture of the fibers reinforced article on the basis of epoxy resin. At that previously form the fibrous material and place it in the mold coated with the separation layer with its subsequent closing, that is accompanied by giving to the placed in it fibrous material of the determined shape. In the mold under the routine pressure they inject the mixture, which in translation into 100 mass shares contains: (I) epoxy resin in amount from 50 up to 70 mass shares, (II) aromatic diamine in amount from 25 up to 50 mass shares and (III) the cross-linkable elastomeric particles on the basis of the polyorganosiloxanes in the amount from 2 up to 25 mass shares. At that the effective diameter of the particles is from 1·10-8 up to 5·10-6 m, and the mean molecular mass is from 1000 up to 100000. At that by the reaction-capable groups, which may enter the chemical reaction with the epoxy resin, mainly just the surface of the elastomeric particles is modified. Other routine additives make from 0.05 up to 2 mass shares. Further the mixture is exposed to the cross-linkage, and if necessary, with heating of the mold, and the finished article is extracted from the mold.

EFFECT: the invention ensures development of the method of manufacture of the articles with the exclusively high impact elasticity without any effect on their others mechanical or thermal characteristics.

10 cl, 1 dwg, 3 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to the method of forming structural element from composite material and to structural element from composite material. Forming of laminar prepreg comprises preparatory stage whereat set of prepregs with various fibre orientation is subjected to lamination to produce flat plate-like form. Note here that during preparatory stage, selected prepreg with fibre orientation aligned with fold formation direction or approximating thereto is split in either zone fold formation or nearby it, or in direction that efficiently restraints fold formation. Now, split product is used to produce laminar prepreg.

EFFECT: preventing fold formation in fibres, producing structural element from composite material.

7 cl, 9 dwg

FIELD: machine building.

SUBSTANCE: group of inventions refers to procedure and device for manufacture of formed item with reinforcing fibre produced by means of forming strip-like laminar material and consisting of arranged in layers large amount of sheets with reinforcing fibre and of material for maintaining laminar material to keep laminar state. Also, the formed item has at least two bent parts in its cross section shape perpendicular to lengthwise direction of strip-like laminar material and a bridge formed between ends of adjacent bent parts. The formed item has at least two flange parts projecting from the bridge through the bent parts. The procedure consists in a stage of supply of strip-like laminar material, in stage of fabrication of bent parts for making at least two bent parts, and a stage of transfer for periodic transfer of strip-like laminar material continuously located in a zone form the stage of supply to the stage of fabrication of bent parts. Also, the stage of bent parts fabrication includes at least two stages facilitated in two places in the direction of strip-like laminar material transfer. At least two stages of bent parts forming consist in the first stage of bent part forming at the nearest side downstream and the second stage of bent part forming positioned further from the first stage of forming. The first stage of bent part forming makes at least one bent part from at least two bent parts; while the second stage of bent part forming makes at least one bent part from at least two bent parts different from the bent part, formed during the first stage. At least two stages of bent parts forming can include the first stage of bent part forming positioned on one end side in the direction of width of strip-like laminar material and the second stage of bent part forming positioned on another end side in the direction of width of strip-like laminar material. The first and/or the second stage of bent part forming includes the stage of changing distance between bent parts. The device consists of a supplying unit for supply of strip-like laminar material, of a unit for fabrication of bent parts and of a carrying unit for periodic transfer of strip-like laminar material. The unit of bent parts fabrication includes at least two appliances for bent parts forming facilitated in two places in the direction of strip-like laminar material transfer. At least, two units for bent parts forming include the first unit on the nearest side downstream, and the second unit located further downstream from the first unit. The first and the second units for bent part forming have correspondingly the first and the second forms each containing two parts facing one another, opening and closing for maintaining strip-like laminar material and for exerting pressure on it to form a bent part, the first and second appliances for opening/closing to open an close the first form, and the first and second heating facilities for heating correspondingly the first and the second forms. The device can also include a mechanism for form position change for varying relative distance between the first form and the second form in the direction perpendicular to the direction of strip-like laminar material transfer.

EFFECT: raised efficiency of manufacture of item with reinforcing fibre; reduced expenditures and time for manufacture of said item.

20 cl, 30 dwg

FIELD: chemistry.

SUBSTANCE: present invention relates to glass threads for reinforcing polymer materials. The glass threads are coated with an aqueous sizing composition containing adhesive film-forming components in form of a mixture of at least one polyvinyl acetate and at least one polyvinyl pyrrolidone, wherein the at least one polyvinyl acetate makes up 70-90% of the weight of solid substance of the mixture. Also, the aqueous sizing composition contains (in wt % in terms of weight of solid substance) 0.1-5 polyvinyl pyrrolidone, 6-20 plasticiser, 3-9 sizing agent, 2-7 combination agent and 0-5 antistatic agent. The obtained glass threads are used as reinforcement when making moulded articles containing a thermosetting matrix, obtained by moulding with spraying of said threads and resins, especially moulding long threads using an injection technique.

EFFECT: prevention of kinking of the thread after unwinding and ensuring integrity of the thread (preventing separation into fibres) after cutting.

15 cl, 1 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to technological processes and can be used in producing moulded articles for structural and electrical purposes. The method involves producing binding material by mixing phenol-formaldehyde resin and polyvinyl acetate emulsion, mixing the binding material with reinforcing material in form of pieces of glass fibre and drying the obtained mixture. Calcium stearate is used when producing the binding material. The reinforcing material used is 4-6 cm pieces of glass fibre. The binding material is produced using 14-20 wt % polyvinyl acetate emulsion, 71-77 wt % phenol-formaldehyde resin and 3-9 wt % calcium stearate. The binding material and the reinforcing material are mixed in equal ratio with respect to dry residue. Before mixing the binding and reinforcing materials, the binding material is turned into a foamed state. The volume of air bubbles ranges from 40% to 50% of the total volume of the dispersion system.

EFFECT: improved physical and mechanical properties of the obtained moulding material.

1 ex

FIELD: chemistry.

SUBSTANCE: suction hole is formed in the film of an elastic bag (3) for sealing space for fibre meant for saturation with a polymer resin after the beginning of saturation. The suction hole is covered with a plate (56) with holes (57). The polymer resin is sucked from space through the plate (56). In the method of making composite material, a defect formed during saturation of fibre with the polymer resin can be repaired before the polymer resin is hardened without disrupting the order and damaging the fibre. In the composite material formed from material repaired using the method described above, the repaired area is strong and there is particularly no deterioration in strength as a result of repairs after hardening. Thus, the material made using the method and the apparatus disclosed herein is preferable compared to composite material which was repaired after hardening of the polymer resin.

EFFECT: reduced deterioration of strength of the composite material owing to repair before hardening.

15 cl, 10 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of structural element of composite, aircraft wing and fuselage and pre-impregnated flat-sheet laminate. Proposed method comprises forming the laminate including pre-impregnated laminate sheets in the mould. Laminate includes first layer wherein fibers are directed in one direction. First layer first surface crossing aforesaid one direction and second surface crossing said one direction are opposed.

EFFECT: ease of forming, smaller chances of wrinkling.

7 cl, 23 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to disc filter sector used for separation of solids from fluid. Disc filter sector incorporates polymer material reinforced with natural fibres. Disc filter sector material represents a polymer composite wherein polymer binder 34 is reinforced with natural fibres 35.

EFFECT: possibility of crushing and combustion of sectors and sector components in normal boiler with no harm to environments.

10 cl, 6 dwg

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