Layered sealing material for gaskets

 

(57) Abstract:

The invention relates to materials (paronite) and various gaskets of them, intended for use in sealing the knots with flat sealing surfaces during operation of which the material is subjected to alternating thermal and mechanical loads - periodic compressions, heating, etc. Layered sealing material includes several flat composite layers with a matrix of a vulcanizate of the rubber, with the surface layer material has a high recoverability. The material has a high sealing ability.

The present invention relates to a flat layered sealing materials (paronite) and various gaskets of them, intended for use in sealing the knots with flat sealing surfaces during operation of which the material is subjected to alternating thermal and mechanical loads (periodic compressions, heating and others).

Analogous to the claimed invention is a layered sealing material containing several flat parallel layers of polymer composite, comprising the Mat is the production of asbestos technical products. L., Chemistry, 1983, cc. 185-194). The essential features of similar “more planar parallel layers of polymer composite comprising a matrix made of a vulcanizate of the rubber inside of the particles (fibers) fillers” match the essential features of the claimed invention.

The disadvantage of analog is the reduction in sealing properties of the material as a result of insufficient fixtures strip, especially the surface layer to the surfaces of the flanges, causing an increased possibility of leakage of the sealed environment and, consequently, reduced flange sealing gasket.

The prototype of the claimed invention is a layered sealing material containing several flat parallel layers of polymer composite comprising a matrix made of a vulcanizate of the rubber inside of the particles (fibers) fillers. For each line orthogonal cross section of the layered material in maximum performance compression material the sum of the lengths of the sections of this line of solid particles dispersed filler is less than the thickness of the layered material, and the sum of the lengths of the sections of this line of solid particles dispersed filler for each Spa “more planar parallel layers of polymer composite, include a matrix of a vulcanizate of the rubber inside of the particles (fibers) fillers” match the essential features of the claimed invention.

The disadvantage of the prototype is also a decrease in sealing properties of the material as a result of insufficient adaptation of the surface layer of the strip to the surfaces of the flanges, causing the increasing possibility of leakage of the sealed environment and, consequently, reduced flange sealing gasket.

The challenge which seeks the invention is to increase the sealing ability of the material (strip) by increasing the possibilities for adaptation of the surface layer of the strip to the sealing surfaces.

To achieve the technical result in layered sealing material (and the strip), containing several flat parallel layers of polymer composite comprising a matrix made of a vulcanizate of the rubber inside of the particles (fibers) fillers, at least one of the surface layers of the material made with the recoverability of after compression is greater than that of the other layers.

Significant is newlinemode after compression is greater than the rest of the layers are different from the characteristics of the prototype.

Layered material includes multiple layers of polymer composite comprising a matrix made of a vulcanizate of the rubber inside of the particles of the powdery filler (or only represent a mixture of various powdered fillers and fibrous filler (or more fibrous fillers). As a powder filler can be used in a variety of solid particles, for example, alumina, kaolin, etc. or mixtures thereof. As the fibrous filler can be used asbestos, polyaramid threads and other fibers or mixtures thereof. In this case, both the surface layer or the surface layer of material in contact with a hot roller paronit rolls (shirt layer) made with recoverability after compression is greater than the other layers.

Be made of the inventive material may known methods, for example, paronit technology selection formulation shirt layer, providing the necessary resilience, by, for example, exceptions to the original recipe mix a vulcanization activator or other

matrix-based rubbers 20-40

disperse fillers 20-40

fibrous filler 20-40

Shirt of nastoyka can have the matrix on the basis of the same or other rubber and contain the same or other fillers, however, the composition of the initial mixture for this nasoni or does not turn on a vulcanization activator (e.g., zinc oxide), or its amount is substantially reduced in comparison with required. The compressibility of all nasioc specific example is ~5-18% (at a pressure of 35 MPa), the recoverability of the main nasioc 33-38% (after removing pressure 35 MPa), vosstanavlivaemoi shirt nasoni not less than 40%.

The material is produced in paronit rollers on paronit technologies shirt layer.

Example 1

The composition of the initial mixture for the core layers, %:

A mixture of rubbers NC and SKI-3 13,5

Curing group 2,5

Fillers (minium, barite) 24

Asbestos 60

The composition of the initial mixture for the shirt layer, %:

The mixture of rubber SKI-3 and SMS-ARC 17

Curing group 2,5

Fillers the x layers, %:

Rubber SKS-AC 11

Curing group 1,5

Kaolin 10

Graphite 12

Asbestos 65,5

The composition of the initial mixture for the shirt layer, %:

A mixture of rubbers NC and SKB 15

Curing group 1,5

Carbon technical 8,5

Asbestos 75

The production of layered material with the shirt layer with high recoverability, allows to improve the sealing properties due to better adaptation to the surfaces of the flanges of shirting surface layer of the strip, which in the manufacture of the material paronit technology is subjected to the greatest heat, which reduces the characteristics of this layer, in particular, the recoverability after removing the load. As a result, in conditions of variable loading less likelihood of irreversible deformations of the surface of the strip, which can cause leakage of the sealed environment. Manufacturer of all layers of material without a vulcanization activator (or with a low content) can affect its strength and processability. It is possible to manufacture with high recoverability of both the surface is a mini-impact it is not always justified from the point of view of economic indicators.

Layered sealing material for the strip, containing several flat parallel layers of polymer composite comprising a matrix made of a vulcanizate of the rubber inside of the particle and / or fiber fillers, characterized in that at least one of the surface layers of the material made with the recoverability of after compression is greater than that of the other layers.