WO2017001232A1 - Use of a thermoplastic as a sliding material, method for producing a sliding element, and structural bearing with a sliding element made of thermoplastic - Google Patents

Abstract

The invention relates to a method for producing a thermoplastic and to a use thereof as a sliding material for a sliding element (6) in a structural bearing (1). The sliding material is modified with respect to its strength by means of crosslinking such that at a temperature which is elevated by at least 5k compared to a comparison temperature, the value of the characteristic compressive strength of the sliding material corresponds to the value which is reached at the comparison temperature with a corresponding sliding material that is not crosslinked. The invention also relates to structural bearings produced using the sliding material.

Description

 Use of a thermoplastic material as a sliding material, method for producing a sliding element and structural bearing with a sliding element made of thermoplastic material

The present invention relates to the use of a thermoplastic material as a sliding material for a sliding element in a structural bearing, a method for producing a sliding element of a structural bearing using a thermoplastic material as a sliding material, and a structural bearing with a sliding element, which has been prepared by such a method.

Under a building warehouse to be understood here are those camps that are quite generally provided in buildings for the storage thereof or parts thereof. These are in particular bearings which fall under the scope of the European standard EN 1337. It may therefore be components that allow twists between two parts of the building and transferred according to requirements defined loads and prevent shifts (fixed bearings) or in one direction (guided bearings) or in all directions of a plane (all sides movable bearings) allow. The most common structural bearings are listed in Table 1 of EN 1337 in its current version of 2004 and in Part 1 (EN 1337-1: 2004 for short). However, other designs or modifications can also be found in other standards, such as the bearings for earthquake insulation, which are specially standardized in EN 15129. The present invention relates in particular to sliding bearings of various types, such as spherical plain bearings, or the sliding pendulum bearings mentioned in EN 15129 and used for earthquake isolation, etc.

Under a sliding element are those parts of a building warehouse to understand that ensure a sliding movement between the parts of the building warehouse. These are, for example, those parts made of a thermoplastic material, which fall under the scope of Part 2 of EN 1337 in the version of 2004 (short EN 1337-2: 2004).

However, unlike EN 1337-2: 2004, the invention not only relates to the use of PTFE (trade name Teflon) but also quite generally to other thermoplastics such as UHMWPE (ultra-high molecular weight polyethylene), PA (polyamide) and mixtures thereof.

The requirements for thermoplastic sliding materials used in this way are known in principle. On the one hand, they should enable a uniform distribution and removal of the load acting on the structural bearing. On the other hand, they must absorb the recording of sliding movements in the structural warehouse (translational, as well as possibly rotational movements) so that it - at least in use - does not damage the building. In this respect, the Sliding movements with application-specific requirements for the coefficient of friction. EN 1337-2: 2004 defines such requirements for the coefficient of friction, but only for sliding parts made of PTFE. EN 15129 defines, in particular in section 8.3, general test requirements for determining the friction to dissipate during an earthquake. Furthermore, such a sliding material course also against environmental influences such as temperature, humidity, but also aggressive media such as acid rain or air pollution resistant and have the greatest possible resistance to wear.

Experience has shown that thermoplastics have different characteristics, so that their selection with regard to use in such a structural warehouse can only be made by making various compromises between the corresponding requirement profiles.

A particularly good compromise of a particularly viable, wear-resistant and resistant to environmental influences sliding material is the applicant with her under the trade name MSM ^{® sold} sliding material succeeded. This is used in the form of sliding elements, which are designed both as flat and / or curved sliding disks but also as guides. Particularly successful is the application in the field of plain bearings, for example in so-called spherical plain bearings or for earthquake isolation in Gleitpendellagern. The MSM sliding material has virtually led to a revolution in building construction because it has led to a significantly higher durability of the bearings at lower production costs.

Despite these outstanding properties, however, it has been found that these structural bearings, which are already very widespread, are reaching their performance limits in certain fields of application, especially in hot regions. This is because in the case of thermoplastics (such as PTFE, UHMWPE), which have hitherto been widely used in structural bearing construction, it is precisely the pressure stability at a higher temperature which decreases and the energy dissipation is not satisfactory in the case of unlubricated use.

It is therefore an object of the present invention to show a use of thermoplastic sliding materials in structural bearings, which allow the use even at higher temperatures and / or pressures and / or to influence the sliding resistance in such pressures.

The solution of this object is achieved with the use of a thermoplastic material as a sliding material for a sliding element in a structural bearing according to claim 1, wherein the sliding material is modified in terms of its strength by crosslinking so that the value of its characteristic compressive strength at a compared to a reference temperature by at least 5K increased temperature corresponds to that which is achieved with a corresponding but not cross-linked sliding material at the comparative temperature.

The plastic to be used according to the invention is thus modified in terms of its properties by crosslinking so that its pressing behavior is a specific one. This is based on the knowledge that with the help of cross-linking it is possible to deliberately change the strength of thermoplastics so that the sliding material flows only to a limited extent under high pressure even at high temperatures and the flow practically comes to a standstill after a certain time. It has recognized on the applicant side that you can make these properties especially in the construction industry in a particularly amazing way to use. For attempts by the Applicant have shown that designed specifically to increase the strength networking surprisingly little influence on the coefficient of friction even of most different thermoplastics and if, then for certain applications even in some cases particularly advantageous manner. In this respect, the use according to the invention of such selectively crosslinked thermoplastics with a view to increasing the strength clearly expands the field of application of such structural bearings.

The usual way is to determine the value of the characteristic compressive strength in a compression test on a specimen corresponding to a specific dimensional specification and consisting of the sliding material. Characteristic pressure resistance is to be understood here as the one used in EN 1337-2: 2004. The reference temperature may be a common temperature, about 35 ° C.

A suitable compression test with specified dimensions and the conditions under which it is to be carried out is specified, for example, in the European Technical Approval ETA 06/0131 and its approval guideline. Accordingly, a compression test is an experiment in which a partially chambered sample (specific information on shaping, chambering and loading of the test specimen, as stated in ETA 06/0131 and its approval guideline) is in the form of a flat circular disk with the desired temperature and surface pressure is applied. The settling process must come to a standstill after a predetermined time (usually 48 hours). The sample is inspected for damage (e.g., cracks) after relieving. Characteristic compressive strength is defined as the maximum pressure at which settlement ceases, as described, and no damage is occurring at the moment. In general, therefore, the maximum absorbable pressure and thus the characteristic compressive strength iteratively determined by several such tests.

Preferably, a thermoplastic material is used which has a lower modulus of elasticity than polyamide (PA) or polyethylene terephthalate (PET). Experiments have shown that it is the particularly rigid thermoplastics (such as PA, PET) that cause problems and that Their positive pressing properties can also be achieved by networking previously classified as weaker thermoplastics such as UHMWPE. In particular, the thermoplastics which have hitherto been used for use at elevated temperatures show an inhomogeneous load transfer behavior. In addition, they show in friction pairing significant stick-slip effect, which can have a segregation of the camp and thus catastrophic consequences especially in earthquake storage in case of disaster. All this is not in the inventive use less rigid but correspondingly crosslinked thermoplastics not. Appropriately, the modulus of elasticity is determined in the tensile test according to DIN ISO 527-2. However, other types of determination are also conceivable, such as a bending test.

Further, a thermoplastic material is used as a sliding material in which the value of the characteristic compressive strength to at least to a temperature of 40 ° C, preferably 48 ° C, corresponds to that which is achieved with a corresponding but not cross-linked sliding material at 35 ° C. Since structural bearings are rarely exposed to direct sunlight, such an extension of the temperature application range is sufficient to achieve the range of application of such bearings noticeably in comparison to known bearings with corresponding but uncrosslinked sliding materials.

Preferably, the value of the characteristic compressive strength corresponds to at least to a temperature of 60 ° C, that which is achieved at a corresponding but not cross-linked sliding material at 48 ° C. It is even more advantageous if the value of the characteristic pressure resistance to at least to a temperature of 60 ° C, that corresponds to that which is achieved with a corresponding but not cross-linked sliding material at 70 ° C. This significantly expands the range of application compared with corresponding but untreated sliding materials. In addition, the Applicant's experiments show that a compromise between the sliding properties and the setting properties, which is desirable especially in structural bearing construction, is achieved precisely when using sliding materials modified in this way.

Further development, the use of a thermoplastic material as a sliding material in which the value of the characteristic compressive strength at comparative temperature by at least 5%, preferably at least 10%, is higher than in a corresponding but not cross-linked sliding material. First, this leads to the fact that due to the increased strength of the bearings can be made smaller and thus more cost-effective with the same temperature load. In addition, based on this criterion, a selection of the plastic to be used can be carried out in such a way that it is ensured that strength values are still reached at elevated temperatures which approximately correspond to those which occur at a conventional reference temperature of, for example, 35 ° Celsius for untreated or not crosslinked corresponding sliding material can be achieved. It is preferred that a thermoplastic material is used as a sliding material, in which the maximum allowable pressure is at least 225 N / mm ² at temperatures between -50 ° C and 35 ° C. Here is the previously already executed to an even greater extent.

Preferably corresponds to the maximum coefficient of friction in a long-term sliding friction test according to Annex D of EN 1337-2: 2004 up to at least 40 ° C, preferably up to 50 ° C and / or up to 70 ° C constant pressure (contact pressure σ _ρ ), that of a corresponding but not cross-linked sliding material with from 35 ° C the compressive strength correspondingly reduced pressure. Because if such strengths are achieved even at higher temperatures, the long-term tests no longer have to be run at one third of the compressive strength as required in Annex D of EN 1337-2: 2004. Further details on a suitable long-term sliding friction test and how this is to be carried out are given eg in ETA 06/0131 and its approval guideline. This clearly facilitates the use of the corresponding sliding material in industrial use in the construction industry, since approvals in the best case omitted or at least easier and faster to obtain.

Developing, it is advantageous if the sliding material at least 40 ° C, preferably at 50 ° C and / or at 70 ° C, an increased wear resistance compared to a corresponding but not cross-linked sliding material at 35 ° Celsius. This ensures that the wear is kept constant while the pressing properties are kept constant. If this is the case, it can be assumed with great certainty according to the invention that the corresponding frictional properties can also be maintained or even improved compared to untreated material.

In a further development or alternatively, the sliding material has a higher coefficient of friction due to the cross-linking in comparison to that of a corresponding but not cross-linked sliding material. It has been shown that it is also possible to influence the coefficient of friction of the sliding material by means of a specific adjustment of the cross-linking so that increased coefficients of friction are established. This is particularly advantageous if the sliding material is to be used in sliding parts for bearings for energy dissipation. In particular, in the case of energy-dissipating bearings for earthquake insulation, it is in fact desirable that friction in the structural bearing also reduces some of the energy of the earthquake shocks. In this respect, it is also advantageous that due to the better temperature resistance, an overall higher energy absorption capacity is achieved in the sliding material to be used. In this respect, therefore, a higher coefficient of friction in the sliding material can be accepted, as with corresponding sliding materials that are not cross-linked. Further, the sliding material has at least one polymer, in particular PTFE, UHMWPE and / or polyamide as a constituent. In this case, mixtures of the different polymers may well be used together.

Furthermore, it is advantageous if at least one surface of the sliding element has been completely cross-linked and / or partially crosslinked. The full-surface crosslinking of at least one surface of the sliding element is expediently carried out on the side at which the sliding element is exposed to friction. This is usually the area that comes into contact with the counter sliding surface in the bearing. It may be advantageous if the surface is not completely cross-linked, but only partially. For example, only the edge region of a sliding element designed as a sliding disk can be crosslinked, since it is exposed to increased edge stresses or compressions. Thus, one obtains a one-piece sliding element with sometimes quite different pressing and friction properties, without the disadvantages otherwise arising in the case of multi-part sliding parts due to joints, etc.

Preferably, however, a sliding material is used which is crosslinked over at least part of the thickness, preferably over the entire thickness, of the sliding element or a part thereof. This ensures that even after prolonged operation of the bearing, the desired properties of the sliding material are still present and do not change with increasing abrasion or wear in an undesired manner.

Conveniently, the sliding material comes lubricated in a designed as a plain bearing structural warehouse for use. Alternatively, the sliding material is also used unlubricated in an energy-dissipating building warehouse to earthquake isolation.

The object of the invention is also achieved by a method for producing a sliding element of a building bearing using a thermoplastic material as a sliding material according to claim 16, wherein at least one surface of the sliding element is fully and / or partially crosslinked. Advantageous developments of this method are included in the claims 17-25.

Advantage of the manufacturing method according to the invention is that it is possible in a relatively simple manner, properties of the sliding element or of the sliding material of which this is to modify or influence by means of the crosslinking process. This has the advantage that a relatively inexpensive adaptation of the properties of the sliding material can take place.

As already explained above, however, the crosslinking preferably takes place over the entire thickness of the sliding element or a part thereof. This ensures that even after prolonged operation of the Bearing still the desired properties of the sliding material are present and do not change with increasing abrasion or wear in an undesirable manner.

Advantageously, the cross-linking of the sliding material takes place by bombardment with high-energy particles (for example by alpha and / or beta radiation) and / or by irradiation with electromagnetic radiation (for example gamma and / or synchronous radiation). This type of crosslinking has crystallized out as a particularly suitable form compared to chemical crosslinking. In particular, it can be adapted in a relatively simple and unproblematic way to the different needs in the construction of building structures.

Further, the bombardment takes place during the crosslinking by means of high-energy particles and / or electromagnetic radiation with a particle or photon energy of at least two MeV and / or a maximum of 20 MeV. In these areas, according to the invention, the best increase values have been shown in the permissible pressure in the case of the different thermoplastic sliding materials.

It is advantageous if the cross-linking of the sliding material takes place at least in regions with different intensity. Thus, the crosslinking can be adapted to the corresponding requirements in the respective structural bearing to the corresponding sliding element or the sliding material. Especially with sliding elements designed as sliding disks, it is advantageous if the edges of the sliding disk can absorb higher pressures than the central inner area of the sliding disk. Since the permissible pressure of the sliding disk is largely determined by the stability of the edge bead formed, an increased strength is particularly advantageous here. Thus, a crosslinking which is only more intensive in some regions in order to increase the pressure in the edge region results in an overall very good compromise between increased pressure values, sliding properties and also costs in the production. It may also be advantageous if, by selective cross-linking, partially increased coefficients of friction are achieved, for example in order to achieve higher damping in the edge region of an energy-dissipating bearing.

It has been found that the intensity of the crosslinking is expediently set by means of a control of an irradiation apparatus, wherein preferably a radiation dose of 20 kGy to 500 kGy is used. This allows a particularly simple adjustment of the intensity of the crosslinking. In addition or alternatively, the intensity of the crosslinking can also be adjusted by using a mask placed on the sliding material. This can further consist of a radiation-absorbing material and have a hole pattern. However, it is also conceivable that a mask is used, which has a first radiation only partially absorbing material and at least a second radiation also only partially absorbing material. So can masks with different radiation transmission be inexpensively manufactured by superimposing different mask materials in a relatively simple manner.

Additionally or alternatively, a mask may be used, which consists of a radiation-absorbing material and has a variable, preferably from the edge towards the center increasing, thickness profile. This makes it easy to produce a varying cross-linking.

Furthermore, the solution of the problem is achieved with a structural bearing with a sliding element, which has been prepared according to one of the previously described production method. According to the invention, such a structural bearing has the particularly positive pressing properties of the sliding material already described above, which in particular means that the entire structural bearing can be used or marketed in a broader field of application.

The invention will be explained in more detail with reference to various embodiments. In it show schematically:

1 shows a partial section through an inventive building bearing with a disc-shaped sliding element of a sliding material used in the invention;

Fig. 2 is a graph showing the characteristic compressive strengths of a first sliding material used in the present invention as compared with conventional PTFE and compared to conventional UHMWPE;

Fig. 3 is a graph showing the characteristic compressive strengths of a second sliding material used in the present invention as compared with conventional PTFE and compared to conventional UHMWPE;

4 shows a disc-shaped sliding element with a mask applied thereto, which absorbs radiation;

FIG. 5 shows a disc-shaped sliding element with an applied radiation-absorbing mask which is perforated; FIG.

FIG. 6 shows a disc-shaped sliding element with a contour-masking radiation-absorbing mask; FIG.

7 shows a mask with a conical thickness profile; 8 shows a mask consisting of several layers of radiation-absorbing material; and

9 shows a mask of different strong radiation absorbing materials.

In the illustrated in Fig. 1 in partially cutaway view (left part of the illustration) structural warehouse 1 is a designed as a so-called Kalottengleitlager plain bearing basically known type. This is shown here only to illustrate what is to be understood in principle as a structural warehouse. However, with respect to the present invention, the type of bearing does not matter. It could therefore also be an arbitrarily differently configured structural bearing with a sliding element 6 according to the invention.

1 has a top plate 2, a cap 3, a bottom plate 4, a sliding plate 5 and a sliding element 6 in sliding contact with the sliding plate 5 in the form of a sliding disk of a thermoplastic material.

However, the bearing 1 shown here is a structural bearing in which, according to the invention, a specifically crosslinked thermoplastic material is used as the sliding material for the sliding element 6. This sliding material is modified in terms of its strength by crosslinking so that a maximum characteristic compressive strength of 180 N / mm ^{2 is maintained} up to at least a temperature of 40 ° C.

This is particularly evident in the course of the characteristic compressive strengths in FIG. 2 designated K1 as a function of the temperature of a first exemplary embodiment of a sliding material modified in this way. Specifically, this is a cross-linked UHMWPE, which has a largely stable characteristic compressive strength of about 180 N / mm ² up to the temperature of 50 ° C according to curve K1. From then on, the characteristic compressive strength drops relatively steadily to a value of about 135 N / mm ² at 70 ° C. This corresponds to the characteristic compressive strength of known sliding materials made of UHMWPE, see curve K2, but at about 50 ° C and shows the significant increase in the range of application of the so modified UHMWPE.

The particularly outstanding suitability of the modified sliding material according to the invention is particularly evident in comparison with the course of the characteristic compressive strength of PTFE shown in dashed lines in FIG. PTFE is still the most widely used thermoplastic sliding material in structural bearing construction. This has at 30 ° C only a characteristic compressive strength of about 90 N / mm ² , see curve K4. The strength then drops with increasing temperature up to a value of about 50 N / mm ² at about 48 ° C from. By using specifically crosslinked thermoplastics according to the invention, however, the characteristic compressive strength can also be raised to above 220 N / mm ² in comparison to the values known for UHMWPE of approximately 180 N / mm ² . The course of the characteristic compressive strengths as a function of the temperature of a second embodiment of the invention is shown in FIG. 3 and there with the curve K3. Also in this embodiment, values of characteristic compressive strength of 90 N / mm ² at 80 ° C are obtained, see also curve K3.

FIGS. 4 to 8 show different forms of irradiation for the targeted cross-linking of the sliding material using differently shaped masks 7. In all embodiments, the irradiation takes place from above onto the underlying sliding element 6, as indicated by the arrows 9 in FIG. 4 and FIG. 8.

FIG. 4 shows a very simple form of such a mask 7. In the present case it is a circular shape. Since, in this exemplary embodiment, the mask 7 has a smaller diameter than the likewise circular sliding element 6, in the case of the centered laying shown here, the mask 7 leads to an annular crosslinking region 11 having a constant width and correspondingly modified material properties at the edge of the sliding element 6.

In Fig. 5, the mask 7 also has a circular outer contour but also also various holes 8. In this respect, the jets 9 can meet the underlying sliding element 6 only through the holes 8 and in the edge region, so that only in the regions 10 at the edge and under the holes 8 of the mask 7, a radiation 10 in regions occurs. These areas 10 are thus networked.

The same applies to the embodiment of the mask 7 in Fig. 6. This has a wavy outer contour, so that a different width edge-side ring in the sliding element 6 as the irradiation area 10 results. Here, therefore, an annular irradiated region 10 with a different thickness is established.

Finally, the exemplary embodiment shown in FIG. 7 is a mask 7 with a thickness which increases in the form of a cone towards the center and made of a partially radiation-permeable material. In this respect, a graded dose of radiation arises in the sliding material of the sliding element 6. As the thickness of the mask 7 increases, less radiation reaches the sliding element 6. Overall, this results in a graded cross-linking and corresponding adjustment of the strength of the sliding element 6 or of the sliding material in the radial direction.

A simpler variant for generating different intensity crosslinking is shown in FIG. Here, a first mask 7a and then a second mask 7b are arranged on a sliding element 6. Alone by the superposition resulting different thicknesses results in a different intensive irradiation. Since, in this example too, the first mask 7a has a smaller disk diameter than the sliding element 6, a fully irradiated, annular first irradiation area 10a adjoins the edge of the sliding element 6. In the region of the sliding element 6, which is covered only by the first mask 7a, a likewise annular second irradiation area 10b is established, which is exposed to a less intensive irradiation. Here is the cross-linking of the sliding material therefore less intense.

Another variant for producing different intensive crosslinking areas is shown in FIG. 9. Here, a first annular mask 7a and in this a second disc-shaped mask 7b is arranged on the sliding element 6, the masks 7a and 7b thus together form the mask 7. In the present example, the first mask 7a is made of a material which transmits more radiation, as the material constituting the second mask 7b. In this respect, a fully irradiated first irradiation area 10a also arises here. In the region of the sliding element 6, which is covered by the first mask 7a, a likewise annular second irradiation area 10b, which is exposed to a less intensive irradiation, and in the middle below the second mask 7b remains over a region which is least ( in the present case unirradiated) is irradiated.

LIST OF REFERENCE NUMBERS

Structural bearings

 top plate

 dome

 lower plate

 sliding

 Slide

 mask

a first mask

b second mask

 hole

 radiation

0 irradiation area

0a first irradiation area

0b second irradiation area

Claims

claims Use of a thermoplastic material as a sliding material for a sliding element (6) in a structural bearing (1), characterized in that the sliding material is modified in terms of its strength by crosslinking so that the value of its characteristic compressive strength at one compared to a Comparison temperature by at least 5K increased temperature corresponds to that which is achieved with a corresponding but not cross-linked sliding material at the reference temperature. Use of a thermoplastic material as a sliding material according to claim 1, characterized in that the thermoplastic material has a lower modulus of elasticity than polyamide or Polyethylene terephthalate has. Use of a thermoplastic material as a sliding material according to one of the preceding claims, characterized in that the value of the characteristic compressive strength to at least to a temperature of 40 ° C, preferably 48 ° C, corresponds to that which is achieved with a corresponding but not cross-linked sliding material at 35 ° C. Use of a thermoplastic material as a sliding material according to one of the preceding claims, characterized in that the value of the characteristic compressive strength to at least to a temperature of 60 ° C, which corresponds to that which is achieved with a corresponding but not cross-linked sliding material at 48 ° C. Use of a thermoplastic material as a sliding material according to one of the preceding claims, characterized in that the value of the characteristic compressive strength to at least to a temperature of 60 ° C, which corresponds to that which is achieved at a corresponding but not cross-linked sliding material at 70 ° C. 6. Use of a thermoplastic material as a sliding material according to one of the preceding claims,  characterized in that  the value of the characteristic compressive strength at reference temperature is at least 5%, preferably at least 10%, higher than with a corresponding but not cross-linked sliding material. 7. Use of a thermoplastic material as a sliding material according to one of  previous claims,  characterized in that the value of the characteristic compressive strength is at least 225 N / mm ² at temperatures between -50 ° C and 35 ° C. 8. Use of a thermoplastic material as a sliding material according to one of  previous claims,  characterized in that the maximum friction coefficient in a long-term sliding friction test according to Annex D of EN 1337-2: 2004 up to at least 40 ° C, preferably up to 50 ° C and / or up to 70 ° C constant pressure (contact pressure σ _ρ ), which corresponds to a corresponding but not cross-linked sliding material with from 35 ° C the compressive strength correspondingly reduced pressure. 9. Use of a thermoplastic material as a sliding material according to one of  previous claims,  characterized in that  the sliding material at at least 35 ° C, preferably at 50 ° C and / or at 70 ° C, an increased wear resistance compared to that of a corresponding but not cross-linked sliding material at 35 ° C. 10. Use of a thermoplastic material as a sliding material according to one of  previous claims,  characterized in that  the sliding material has an increased friction due to the cross-linking in comparison to that of a corresponding but not cross-linked sliding material. 1. Use of a thermoplastic material as a sliding material according to one of previous claims, characterized in that  the sliding material comprises at least one polymer, in particular PTFE, UHMWPE and / or PA, as constituent. 12. Use of a thermoplastic material as a sliding material according to one of  previous claims,  characterized in that  at least one surface of the sliding element has been completely cross-linked and / or partially crosslinked. 13. Use of a thermoplastic material as a sliding material according to one of  previous claims,  characterized in that  the sliding material has been crosslinked over at least part of the thickness, preferably over the entire thickness, of the sliding element or a part thereof. 14. Use of a thermoplastic material as a sliding material according to one of  previous claims,  characterized in that  the sliding material lubricated in a designed as a sliding bearing bearing (1) is used. 15. Use of a thermoplastic material as a sliding material according to one of  previous claims,  characterized in that  the sliding material unlubricated in a renergiedissipierenden building warehouse for  Earthquake isolation is used. 16. A method for producing a sliding element of a structural bearing using a thermoplastic material as a sliding material,  characterized in that  at least one surface of the sliding element (6) is completely cross-linked and / or partially cross-linked. 17. Method for producing a sliding element according to  Claim 18,  characterized in that the sliding material over at least a portion of the thickness, preferably over the entire Thickness, the sliding element or a part thereof is crosslinked. 18. A method for producing a sliding element according to one of the preceding claims, characterized in that  the crosslinking of the sliding material takes place by bombardment with high-energy particles and / or by irradiation with electromagnetic radiation (9). 19. A method for producing a sliding element according to one of the preceding claims, characterized in that  the bombardment is carried out by means of high-energy particles and / or electromagnetic radiation with a particle or photon energy of at least 2 MeV and / or a maximum of 20 MeV. 20. A method for producing a sliding element according to one of the preceding claims, characterized in that  the cross-linking of the sliding material takes place at least in regions with different intensity. 21. A method for producing a sliding element according to one of the preceding claims, characterized in that  the intensity of crosslinking is adjusted via control of an irradiation device, preferably using a radiation dose of 20 kGy to 500 kGy. 22. A method for producing a sliding element according to one of the preceding claims, characterized in that  the intensity of the crosslinking is adjusted by using a mask (7) placed on the sliding material. 23. Method for producing a sliding element according to  Claim 24,  characterized in that  a mask (7) is used, which consists of a radiation-absorbing material and has a hole pattern. 24. Method for producing a sliding element according to  Claim 24, characterized in that a mask (7) is used, which consists of a radiation-absorbing material and having a variable, preferably increasing from the edge towards the center, thickness profile. 25. A method for producing a sliding element according to  Claim 24,  characterized in that  a mask (7) is used which comprises a first radiation partially absorbing material and at least one second radiation partially absorbing material. 26. Structural bearing (1) with a sliding element (6) according to one of the preceding  Claims 18 to 27 has been produced.