Composition and foamed polyurethane article formed therewith
A composition for preparing a foamed polyurethane article is disclosed. The composition comprises (1) an isocyanate-reactive component and (2) an isocyanate component. The (1) isocyanate-reactive component comprises (A) an organopolysiloxane having an average of at least two carbinol functional groups per molecule and (B) a polyol. The (A) organopolysiloxane is present in an amount of from >10 to <99 wt. % based on the combined weight of the (A) organopolysiloxane and the (B) polyol. The (2) isocyanate component comprises (C) a polyisocyanate. The composition further comprises (D) a blowing agent, and (E) a catalyst. A foamed polyurethane article comprising the reaction product of the composition is also disclosed, along with use of the foamed polyurethane article.
1 . A composition for preparing a foamed polyurethane article, said composition comprising:
(1) an isocyanate-reactive component, the isocyanate-reactive component, comprising:
(A) an organopolysiloxane having an average of at least two carbinol functional groups per molecule; and
(B) a polyol;
wherein the (A) organopolysiloxane is present in the isocyanate-reactive component in an amount of from >10 to <99 wt. % based on the combined weight of the (A) organopolysiloxane and the (B) polyol; and
wherein the (A) organopolysiloxane includes up to 5 mol % T and/or Q siloxy units based on all siloxy units present in the (A) organopolysiloxane;
(2) an isocyanate component comprising (C) a polyisocyanate;
(D) a blowing agent; and
(E) a catalyst.
2 . The composition of claim 1 , wherein: (i) the carbinol functional groups are the same as one another; (ii) the carbinol functional groups have the general formula -D-O a —(C b H 2b O) c —H, where D is a covalent bond or a divalent hydrocarbon linking group having from 2 to 18 carbon atoms, subscript a is 0 or 1, subscript b is independently selected from 2 to 4 in each moiety indicated by subscript c, and subscript c is from 0 to 500, with the proviso that subscripts a and c are not simultaneously 0; or (iii) both (i) and (ii).
3 . The composition of claim 2 , wherein, in at least one of the carbinol functional groups: (i) subscript D is a divalent hydrocarbon linking group having from 2 to 18 carbon atoms, subscript a is 1, and subscript c is 0 such that the carbinol functional group has the general formula -D-OH; (ii) the carbinol functional groups are terminal; or (iii) both (i) and (ii).
4 . The composition of claim 1 , wherein: (i) at least one of the carbinol functional groups has the general formula:
where D is a covalent bond or a divalent hydrocarbon linking group having from 2 to 18 carbon atoms, subscript a is 0 or 1, 0≤x≤500, 0≤y≤500, and 0≤z≤500, with the proviso that 1≤x+y+z≤500; (ii) the carbinol functional groups are pendent; or (iii) both (i) and (ii).
5 . The composition of claim 1 , wherein: (i) component (A) has an OH equivalent weight of from 400 to 1,200 g/mol; (ii) component (A) has a viscosity at 25° C. of from 1 to 1,000 mPa·s; (iii) component (A) is substantially linear; (iv) at least one of the carbinol functional groups is pendent; (v) at least one of the carbinol functional groups is terminal; (vi) component (A) is present in the composition in an amount of from 15 to 80 wt. % based on the total weight of the composition; (vii) component (A) has the general formula:
where each R is an independently selected hydrocarbyl group or comprises a carbinol functional group, with the proviso that at least two of R independently comprise a carbinol functional group, and subscript n is from 0 to 100; of (viii) any combination of (i) to (vii).
6 . The composition of claim 1 , wherein component (B): (i) has a number-average functionality of from 2 to 8; (ii) has an average OH equivalent weight of from greater than 0 to 2,000; (iii) is a polyether polyol; or (iv) any combination of (i) to (iii).
7 . The composition of claim 1 , wherein: (i) component (C) comprises polymeric MDI (pMDI); (ii) the isocyanate-reactive component has a viscosity at 25° C. of less than 1,000 mPa·s; or (iii) both (i) and (ii).
8 . A foamed polyurethane article comprising the reaction product of the composition of claim 1 .
9 . The foamed polyurethane article of claim 8 , having: (i) a closed-cell structure; (ii) a glass transition temperature (T g ) of greater than 20° C.; (iii) a density of from 0.1 to 0.6 g/cm 3 ; or (iv) any combination of (i) to (iii).
10 . The foamed polyurethane article of claim 8 , further defined as an encapsulant, a pottant, a thermal barrier, and/or an article suitable for automotive applications.
11 . A method of preparing a composite article, said method comprising:
disposing a composition on a substrate, and
curing the composition to give a foamed polyurethane article on the substrate and prepare the composite article,
wherein the composition is the composition of claim 1 .
12 . The method of claim 11 , wherein the substrate defines at least one gap and disposing the composition comprises disposing the composition in the at least one gap such that the foamed polyurethane article is present within the gap in the composite article.
13 . The method of claim 12 , wherein the substrate comprises a battery cell and the composite article comprises a battery pack.
14 . The composite article formed in accordance with the method of claim 11 .