Antistatic or semi-conductive polyurethane elastomers
A polyurethane elastomer, semi-conductive technology, applied in the field of polyurethane elastomer, can solve the problem of difficult to ensure the conductive path of the polyurethane elastomer
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Embodiment 1
[0059] Prepolymers were prepared by charging Component A into a stainless steel reactor. The reactor contents were then dehydrated to less than 0.04% water, based on the weight of Component A, by heating under vacuum at a temperature of 120 degrees Celsius (°C) for 120 minutes. Recheck water content, continue dehydration if necessary, otherwise cool reactor contents to 50°C. Component B is then added. The reactor contents were then further cooled to 50°C and component C charged. The reactor contents were reacted at 75°C for 2 hours. Component D was then charged and the reactor contents cooled to 50°C. The result was a prepolymer intermediate, and the proportions of each component are shown in Table 1. Testing with di-n-butylamine by means of potentiometric or wet titration techniques showed an NCO content of 14.0% and a viscosity of 15 poise at 50°C.
[0060] Table 1
[0061] components
weight%
Component A
49.292
Component B
0.005
...
Embodiment 2
[0079] A second formulation was prepared using the procedure of Example 1, but first dispersing Component E in Component A in a stainless steel reactor. The reactor contents were then dehydrated to less than 0.04% water, based on the weight of Component A, by heating under vacuum at a temperature of 120 degrees Celsius (°C) for 120 minutes. Recheck water content, continue dehydration if necessary, otherwise cool reactor contents to 50°C. Component B was then added and the remaining procedure of Example 1 was followed.
Embodiment 3 and comparative example A
[0080] Example 3 and Comparative Examples A and B
[0081] Following the procedure of Example 1, using the same components as in Example 1, but excluding Component L and further including Component M, three comparative polyurethane elastomers were prepared, said Component M being combined with Components F-K To the preparation of polyols. However, the difference is that carbon black (component E) is first introduced in component F in Example 3 and then introduced into the prepolymer together with component F; component E is first introduced in component F in comparative example A and then combined with Component F is introduced partly together into the prepolymer and partly into the non-prepolymer formulated polyol; and in Comparative Example B it is first introduced into component F and then together with component F into only the non-prepolymer In the preparation of polyols. The ratios of formulated polyols are shown in Table 5 and tested and the results are recorded in Ta...
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