Method of forming composite coating from silicate polymer material

FIELD: technological processes.

SUBSTANCE: invention pertains to the technology of polymer functional materials and can be used in machine building when forming coatings for component part of machines, mechanisms and transport systems, and mainly pipes for pumping petroleum products. The method of forming composition coating from silicate polymer material involves mixing powder polymer particles and silicate particles. The mixture is then deposited on the surface of the object and heated. Polymer particles are flushed off and monocrystallisation of the coating is carried out. The powder polymer particles are chosen from a group containing polyamide, polyethyleneterphtalate, high pressure polyethylene. Silicate particles are chosen from a group containing montmorillonite, kaolin, tripolite. Heating and flushing off are done in a gas stream with density of 3·106-9·106 W/m2 for a period of 10-4-10-3 s. Depositing and monocrystallisation are done on an object, heated to temperature T=Tm+5÷40°C, where Tm is the melting temperature of the polymer, with pressure of the gas stream of 3-5 atmospheres. The coating is formed by depositing it on one or more ducts of the used device for depositing it, or is deposited by successive passage of the device with the polymer component, and then a device with the silicate component.

EFFECT: increased adhesive strength, hardness and ultimate stress limit, and design of a method which provides for high production effectiveness of the process and lower cost of the coating.

3 cl, 2 tbl

 

The invention relates to the field of technology of functional polymer materials and can be used in mechanical engineering for coating on the details of the units of machines, machinery and transport systems, primarily pipelines for transporting petroleum products.

Polymer coatings of different composition is applied to the details of the units of machines and mechanisms to ensure the specified functions - reduce wear, reduce friction, provide the necessary insulating characteristics, corrosion resistance, etc. (Dovgalo VA, Yurkevich O.R. Composite materials and coatings based on dispersed polymer. - Minsk: Science and technology. - 1992. - s). As the polymer matrix used polyamides, Polyacetals, polyolefins, polyurethanes and other thermoplastic and Thermoelastoplastic matrix. To ensure the specified functional characteristics of the coating to the polymeric matrix is injected fillers and modifiers: powders of oxides, metals, dry lubricants, wood and other components.

Among the most common methods of applying functional polymer coatings, along with the mortar technology, fluidized bed technology, according to which you can apply coatings of different composition on the surfaces of metal parts.

Modifiers and napolnitel the polymer matrix have a decisive influence on the performance characteristics of composite materials based on them. The most common modifiers are polymer matrices of different composition and structure of the mineral components are obtained by processing natural semi-finished products: clays, micas, zeolites, etc. Received mineral powders due to the relatively low cost and availability of raw materials, as well as the active modifier action are currently tonnage used by different component matrices.

Known composition to obtain a sealing coating containing a polymer matrix and dispersed filler, which used the powder natural silicates, crushed to size 50÷100 μm, when the content in the matrix of 0.1÷3.0 wt.% (RF patent for the invention №2275404). A coating of this composition is applied by fluidized bed method. According to this method, cleansed and fat metal surface heated to a temperature of 30-50°exceeding the melting temperature of the matrix polymer, dip into the composite layer of powdered material placed in suspension, can withstand a specified time for the deposition of the layer of material of the required thickness, then remove from the work area setup and stand in the air until complete melting of the polymer material and forming a continuous bestepe the private coverage. This technology is described in the monograph of Dovgalo VA, Yurkevich O.R. Composite materials and coatings based on dispersed polymer. - Minsk: Science and technology. - 1992. - s. She was selected for the prototype of the invention.

Among the disadvantages of this method is the separation of components with different mass due to the different specific gravity with the same geometric dimensions, resulting in an inhomogeneous coatings. In addition, to ensure the required level of adhesion of the coating to the substrate must be processed by a special primer (sublayer), which is an expensive and environmentally unsafe product, or phosphotyrosine. This method does not allow to apply a coating to products of large geometric dimensions, mass and complex configuration.

It is known that low-dimensional fillers and modifiers with a particle size less than 100 nm have significantly higher activity compared to particles of the same composition with a dimension of more than 1 μm (Pomogailo ROAD, Rosenberg, A.S., upland I.E. Nanoparticles of metals in polymers. - M.: Chemistry. - 2000. - 672 C.). Traditionally in polymer science applied fillers with a particle size of from 5 to 200 microns.

A method of obtaining low-dimensional fillers of natural layered minerals for polymeric materials (tent the Russian Federation for invention №2269554). The method consists in the treatment of the particles of the layered silicate type clay minerals and micas in thermal shock, which causes the destruction of the crystal lattice as a result of dehydration. In this way we obtain a low-dimensional particle size of not more than 100 nm, which according to modern classification referred to as nanoparticles.

The disadvantage of this method of obtaining low-dimensional particles is in need of special operations heat treatment, which is repeated several times to ensure particle size distribution of the modifier.

The present invention is to develop a method of forming composite coatings of selectonemenu materials, in which the operation of obtaining low-dimensional particles and the formation of the coating would be combined. This will improve the performance of the method, the coating quality, and create conditions to reduce its cost. In addition, the developed method should ensure that the coating on the details of large geometric dimensions, mass and complex configuration.

The task of the invention is achieved by a method of forming a composite coating of silicacontaining material is that the mixed powder is the crustacean leaves of polymer particles, selected from the group comprising polyamide, polyethylene terephthalate, high density polyethylene, and silicate particles selected from the group comprising montmorillonite, kaolin, Tripoli, precipitated mixture on the surface of the workpiece is heated, upravlyaut polymer particles and are monolithically coating, the heating and melting is carried out in a gas flow with a density of 3·106÷9·106W/m2for 10-4÷10-3with, sedimentation and monolithically conduct on the part heated to a temperature of T=Tp+5÷40°s, where Tpthe melting point of the polymer, when the pressure of the gas stream 3-5 ATM. The coating is formed by applying it in one or more passes of the device to be used for its application. In addition, the coating is formed by applying it by serial passage of the device with the polymer component, and then the device with the silicate component.

When forming selectonemenu coatings used the following components. As the polymer matrix used powders of polyamide 6 (PA6), produced by JSC grodnokhimvolokno, polyamide 11 (Rilsan) manufactured by ELF ATOCHEM (France), polyethylene terephthalate (PET) production of JSC "Mogilevkhimvolokno", high density polyethylene (HDPE) produced by JSC "Polymir" (Novopolotsk). Powders PA6, PET, P is VD received cryogenic grinding of granules, cooled to liquid nitrogen temperature (-198°). The dispersion of the powder was 100-200 μm. As a natural silicate used powders of clay minerals: montmorillonite, kaolin and Tripoli, representing natural mixture of montmorillonite and zeolite content 40÷60:60÷40 wt.%. Powders of minerals was obtained by grinding the dried semi-finished product in the mill percussion. The dispersion of particles of minerals does not exceed 1-5 microns.

Composite selectonemenu material was obtained by mixing powder components in a high-speed mixer type MOD-22 (the so-called "drunken barrel") to obtain a homogeneous composition. As technological equipment for coating according to the claimed method used to install TENA-P. the Working gases was propanebutane mixture and oxygen. The temperature of the gas stream (heat flux density) was regulated by changing the ratio and the feed rate of a mixture of propane-butane-oxygen". The substrate was heated gas stream to the optimal temperature of formation of the coating. The temperature of the substrate was controlled by pyrometer DH-39650-02 (USA). The coating is formed of a heat flux of a certain density, which gave a mixture of polymer and silicate components. The residence time of the material components in heat is the base flow was regulated, changing the oxygen pressure and propanebutane mixture. The density of the heat flow was calculated by the heat balance equation:

where m is the mass of particle, kg; m=4πR3ρ/3; R is the particle radius, m; ρ - density of material, kg/m3; Tabout- the initial temperature of the particle, K; TPLthe melting point of the material particles, To; Tmaxthe maximum temperature of the particle, K; Tmax=1,3 Tp; C1(T1) is the specific heat capacity of the material particles when heated from Taboutto Tp, J/(kg·K),2(T2) is the specific heat capacity of the material particles when heated from Tpto Tmax, J/(kg·); λ - specific heat melting particles, j/kg; F is the particle surface area, m2; ν is the particle velocity, m/s; Ix- distance to the sprayed surface; α(x) - heat transfer coefficient, W/(m2·K); Tp(x) is the temperature of the gas stream, TC(x) is the temperature on the surface of the particle, K.

The floor of the prototype was formed from powder mixtures, which were placed in the installation with the possibility of creating a fluidized bed by passing a stream of air through the layer of composite material on a porous diaphragm. The metal piece was degreased and treated with primer Rilprim by dipping on the hoist in alcohol solution. The thickness of the sublayer of 3-5 µm. After drying, the substrate part was heated in a heating Cabinet type SNOL to a temperature of 270-320°to activate the substrate and immersed in a boiling layer of composite material at a given time. The exposure time was determined by the thickness of the coating. After deposition of the particles of the powder composition, the item was removed from the working volume of installation and maintained in the air until complete melting of the polymer particles and monolithically coating, after which the product was cooled in air to room temperature. Features formed in different ways coatings was evaluated by the adhesion strength with the substrate by the method of normal separation, Brinell hardness and tensile strength. The compositions of composite materials in both methods were identical.

Technological modes of formation of coatings from selectonemenu compositions according to the proposed method and the prototype are listed in table 1.

Characteristics of coatings from selectonemenu composite material according to the developed method and the prototype are presented in table 2.

As follows from the data of table 1 and 2, a method of forming selectonemenu coatings exceeds the prototype performance, has a lower energy intensity and includes a smaller number of technological operations, since the heating process, t is tiravanija, application and monolithically coating proceeds at the same time.

The essence of the claimed technical solution is the following. During the mechanical mixing of the powder component particles of silica filler having a size of 1-5 microns, are distributed on the surface of the polymer particles with a size of 100-200 μm. When making composite particles in high temperature gas stream is the activation of the surface layer of the polymer particles resulting from the removal of low-molecular adsorbed substances and partial oxidation of the surface layer. At the same time is heated, melting the polymer particles and degradation of silicate particles in the processes of dehydration and dehydroxylation with the formation of low-dimensional particles.

The flow of the gas jet of the molten particles of polymer with low-dimensional fragments fracture of layered silicates on the surface are transported to the solid substrate. The time of transportation and heating is 10-4÷10-3with, resulting in a certain capacity of the heat flow in the claimed range does not occur deep thermal-oxidative and thermal destruction processes, which could cause the destruction of the polymer matrix. When kontaktierung the solid substrate isolated fragments of the composite material are deformed and become lamellar form, strongly associated with the surface. Each subsequent particle under the pressure of the gas jet interacts with a previously fixed by the particle on the surface, leading to the formation of the coating and its homogenization. Preheating the metal substrate prior to the stated temperature range helps to slow crystallization processes in polymeric matrix and increases the adhesion interaction of the boundary layer of the coating and the metal substrate. Moving the process plant area of the working surface allows to form a coating on the details of a large area, and through the implementation of several serial passages may be formed of a coating of the desired thickness, including a local area of the treated surface. Significant difference between the claimed process from the prototype is the reduction of defects in the coating. When the method of applying a coating of fluidized bed (prototype) consolidation of the coating is in the spreading of individual fragments (drops) of the polymer on the substrate surface under the action of surface tension forces. This captures a significant amount of adsorbed air, which focuses mainly in the interparticle space and forms a coating defects in the cross section. Heat treatment is formed by coating significantly reduces the defect due to the low rate of removal of air bubbles from the melt. The introduction of solid-phase particles in the coating composition increases the number of defective parts due to the increased number of interfaces "polymer matrix, the solid particle".

According to the developed method, the formation of coatings defects is significantly reduced due to the mechanical action of the gas stream to form a coating. Mechanical contact of single fragments displaces from the interparticle region of the gas component, reducing the defect coverage. This mechanical action activates the effect of surface tension forces acting between the individual particles.

Another significant difference between the claimed process from the prototype is the formation of low-dimensional particles directly in the process of forming the coating as a result of thermal degradation of the initial particles of the layered silicate. The generated particles are introduced into the boundary layer of the polymer particles and cause its regulation. In the process of applying is formed spatial framework of an ordered quasi-crystalline regions, reinforced with nanoparticles, which causes an increase in strength, hardness and adhesive strength of the coating on the metal substrate. Therefore, when the same ratio of components of the polymer matrix silicate filler cover, set up shop data is private technology fluidized bed, superior physical-mechanical characteristics of the prototype.

Thus, significant technical differences between the claimed method of forming selectonemenu coatings from the prototype, are the subject of the invention, are:

- the combination in a single manufacturing operation processes the activation of components of the heating and forming of the coating when combined thermal and mechanical action of the gas stream;

- preventing thermal oxidative degradation of the polymer matrix due to the short time of exposure to heat and the absence of gas flow active oxygen or its compounds with a strong oxidative effect;

- the formation of low-dimensional silicate particles due to thermal degradation of the initial particles under the action of heat the gas stream directly in the process of forming coatings;

- reducing coating defects due to mechanical action of the high temperature gas stream into fragments coatings and their deformation upon contact with the surface;

- the possibility of formation of gradient coatings on the large geometrical dimensions, mass and complex configuration.

The coating formed on the metal parts on the stated technological regimes. When increasing the heat on the eye in excess of the declared value (option III b) or decrease (option IIIand), the decrease of the substrate temperature (option IIIandor increased beyond the stated ranges (option IIIb) decrease the indicators of the performance characteristics selectonemenu coatings. The floor is formed by the claimed method for one or more passes depending on the dimensions and requirements of technical documentation. Option complete method is the use of two processing plants - spray heads, one of which is applied to the polymer binder, and the other silicate filler. This variant of the method allows to achieve a more complete degradation of the particles of the layered silicate under the action of high temperature gas stream and provides the possibility of forming a gradient of the single-layer and multilayer coatings with a strong bond at the interface between the layers.

Selectonemenu coating formed by the claimed method were used for the manufacture of parts of motor units at JSC "BelCard", for processing metal supports networks on the Belarusian railway and showed its effectiveness when used in accordance with the technical specifications.

1. Method of forming a composite coating of silicacontaining material, which consists in the fact that cm who're asked powdered polymer particles, selected from the group comprising polyamide, polyethylene terephthalate, high density polyethylene, and silicate particles selected from the group comprising montmorillonite, kaolin, Tripoli, precipitated mixture on the surface of the workpiece is heated, upravlyaut polymer particles and are monolithically coating, the heating and melting is carried out in a gas flow with a density of 3·106·9·106W/m2for 10-4-10-3with, sedimentation and monolithically conduct on the part heated to a temperature of T=Tp+5÷40°s, where Tpthe melting point of the polymer, when the pressure of the gas stream 3-5 ATM.

2. The method according to claim 1, characterized in that the coating is formed by applying it in one or more passes of the device to be used for its application.

3. The method according to claim 2, characterized in that the coating is formed by applying it by serial passage of the device with the polymer component, and then the device with the silicate component.



 

Same patents:

FIELD: metal processing.

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3 cl, 5 ex, 2 tbl

FIELD: chemistry.

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1 tbl, 3 ex

FIELD: chemistry.

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1 tbl

FIELD: inorganic chemistry.

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2 tbl, 3 ex

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3 cl, 2 tbl

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2 cl, 3 tbl, 5 ex

FIELD: polymeric materials.

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EFFECT: improved and valuable properties of composition.

2 tbl, 10 ex

FIELD: protective materials.

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EFFECT: improved and valuable properties of material.

1 tbl

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5 cl, 1 tbl

FIELD: corrosion protection.

SUBSTANCE: invention describes using fine amorphous silica as collector for substances forming coating protecting a structural material against corrosion.

EFFECT: reduced consumption of expensive reagents in a protective pigment preparation process, reduced toxicity of materials based thereon, simplified pigment preparation technology, and increased adhesion of resulting materials for a structure surface.

7 dwg

FIELD: chemistry.

SUBSTANCE: powdered coating agent contains solid particles of a resin-polyurathane binding substance with equivalent mass of olefinic double bonds ranging from 200 to 2000 and content of silicon bonded in alkoxy silane groups ranging from 1 to 10 mass % and a photoinitiator. In the method of obtaining a single layered or multilayered coating on substrates, in particular when obtaining multilayered coating for transportation equipment and their components (car body or car body components coating), at least one layer of this coating is deposited from a powdered coating agent. In that case, solidification of at least one layer of the above mentioned powdered coating is achieved through free-radical polymerisation of olefinic double bonds when irradiated with high energy radiation and through formation of siloxane atomic bridges under the effect of moisture.

EFFECT: obtaining a powdered coating, which is hard, has scratch resistance and good resistance to chemical effects.

8 cl, 1 tbl

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