FIELD: chemistry of polymers, chemical technology.
SUBSTANCE: invention relates to prepolymer with terminal isocyanate groups and characterizing the NCO-number value in the range 5-30 wt.-%, and representing a reaction product of excessive amount of diphenylmethane diisocyanate comprising at least 80 wt.-% of 4,4'-diphenylmethane diisocyanate and polyoxyethylene polyoxypropylene polyol of the mean molecular mass in the range 2000-10000 Da, average nominal hydroxy-functionality in the range 2-6, the content level of ethylene oxide in the range 21-45 wt.-%, and the presence of structure relating to type -PO-PO/EO-EO wherein PO-block comprises 60-90% of PO, and the ratio of terminal EO : statistically distributed EO is in the range from 3:1 to 1:3. Also, invention relates to polyisocyanate composition used for preparing polyurethanes and characterizing by NCO-number value maximally 52.5 wt.-% comprising 1-99 mass parts of the claimed prepolymer and 1-99 mass parts of other polyisocyanate per 100 mass parts of this polyisocyanate composition. Also, invention relates to a method for preparing elastic foam polyurethane from prepolymer or polyisocyanate composition corresponding to the invention as result of carrying out reaction in press-form at index in the range 70-120. Such elastic foam polyurethanes show improved stability and characterized by improved rigidity and good additional properties, for example, strength, residual compression deformation, indices of creep, elasticity, ability for vibration transferring, relative elongation and pleasant by feel. Foam materials made of such prepolymer or composition are used in furniture and automobile branches of industry in making seats, steering wheels, instrument board, furniture and mattress soft packing, and for sound damping and sound insulation.
EFFECT: improved preparing method, valuable properties of composition and material.
10 cl, 2 tbl, 3 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCING FLEXIBLE POLYURETHANE FOAM | 2012 |
|
RU2604531C2 |
| METHOD OF PRODUCING FLEXIBLE POLYURETHANE FOAM | 2010 |
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RU2507215C2 |
| METHOD OF POLYURETHANE FOAM PRODUCING | 2012 |
|
RU2601412C2 |
| METHOD TO PRODUCE VISCOELASTIC FOAM MATERIALS | 2007 |
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RU2437898C2 |
| FORPOLYMER WITH TERMINAL ISOCYANATE GROUPS, METHOD OF OBTAINING THEREOF AND THEREOF APPLICATION | 2010 |
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RU2547097C2 |
| EMPLOYMENT OF POLYISOCYANATE COMPOSITIONS AS BINDING AGENT FOR COMPOSITE LIGNOCELLULOSE MATERIALS | 2001 |
|
RU2275390C2 |
| EMPLOYMENT OF POLYISOCYANATES COMPOSITIONS AS BINDERS FOR COMPOSITE LIGNOCELLULOSE MATERIALS | 2001 |
|
RU2279447C2 |
| FLEXIBLE POLYURETHANE FOAM PRODUCTION PROCESS | 1998 |
|
RU2198187C2 |
| MATRIX-INCLUDING MATERIALS AND METHOD OF MANUFACTURING THEREOF | 2010 |
|
RU2540581C2 |
| WEAKLY MODIFIED PREPOLYMERS AND USE THEREOF | 2011 |
|
RU2587302C2 |
