Welcome to webiste of Qixia Singbon New Material Technology Co., Ltd.

NEWS

Check category
/
/
Thermoplastic polyurethane elastomer, used in seal industry

Thermoplastic polyurethane elastomer, used in seal industry
Top

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2021-10-11 14:13
  • Views:

(Summary description)

Thermoplastic polyurethane elastomer, used in seal industry
Top

(Summary description)

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2021-10-11 14:13
  • Views:
Information

 

 

The performance of seals depends on the following aspects

 

The intensity of

The strength of the material determines the pressure of the seal. Thermoplastic polyurethanes have higher tensile strength, and thermoplastic polyurethane seals can withstand greater pressure than rubber seals. We believe that the greater the 100% modulus of the material, the greater the pressure on the seal under small deformation.

 

resilience

Seals must have excellent resilience and small tensile deformation.

 

Dielectric resistance

First of all, there is a trace of water in the hydraulic oil. If the hydrolysis resistance of the thermoplastic polyurethane is not up to the requirements, with the increase of use time, the sealing parts will crack, strength loss, wear, stickiness and other phenomena due to material hydrolysis, thus losing the sealing effect. Secondly, thermoplastic polyurethane should be able to resist the erosion of hydraulic oil, that is, the swelling rate is as low as possible, otherwise there will be sealing swelling and obesity, resulting in tensile strength, especially the decrease of 100% modulus. We found that the swelling effect of old hydraulic oil on seals is much greater than that of new hydraulic oil, and the swelling rate is about 3~5 times higher, so it is possible to use new oil; There are also some special occasions where emulsion is used instead of hydraulic oil, in which case the medium resistance of sealing material must be considered first.

 

Heat resistance

Frequent reciprocating motion and friction will generate heat, so it is required that the seal in a long time in high temperature hydraulic oil, hardness, 100% modulus, especially compression permanent deformation performance can not have too much loss.                                                                                     

The fatigue resistance

That is, good dynamic performance, thermoplastic polyurethane sealing ring application in some high frequency occasions must consider its fatigue resistance, otherwise it will cause stress relaxation sealing ring deformation, thereby reducing the sealing performance, such as nitrogen spring, crushing hammer, etc.

 

The wear resistance

Although there is hydraulic oil as a lubricating medium, but in the process of relative movement will still produce friction, especially high pressure forced lip close to the piston rod or wall, resulting in lip wear; At the same time, the impurities in the hydraulic oil are also one of the factors of lip wear, so the thermoplastic polyurethane must have excellent wear resistance and low friction coefficient. The use of special lubricants can reduce the friction coefficient of thermoplastic polyurethanes and reduce the heat of friction, especially in cylinder applications.

 

Low temperature resistance

Seals may be sent to cold regions at home and abroad with supporting equipment, at this time the low temperature resistance of the material is very important. The low temperature resistance range of ordinary thermoplastic polyurethane material is -20~-35℃, but it needs to withstand the low temperature of -40 or even -50℃ in the cold area, so the low temperature resistance is a very important indicator.

 

 

 

 

Scan the QR code to read on your phone

Add.:East Head of Xinbang Road, Qixia Cuiping Industrial Park, Yantai
Tel:
+86-535-6209089
Fax:+86-535-6206189

© 2019 Qixia Singbon New Material Technology Co., Ltd.  鲁ICP备19022936号   Powered by:www.300.cn