Method and composition for filling elongated channels with expanding foam insulation
View Patent ↗The invention described herein generally pertains to the use of low boiling point, low vapor pressure blowing agents with froth polyurethane or polyisocyanurate foams to fill hollow cavities (particularly window lineals) and which have lowered exotherms, which prevent deformation of the hollow cavity (e.g., window lineal) and additional achieve filling of longer lengths of window lineals by increasing the foaming and gel times of the reaction.
1. A process for filling a window lineal cavity with a frothable polyurethane or a polyisocyanurate foam system without deforming a polymeric window lineal profile, said process comprising the step of:
adding a two-component polyurethane or polyisocyanurate foam precursor to said cavity, said foam precursor comprising an effective amount of at least one blowing agent, including miscible blends and azeotropes thereof, said blowing agent comprising formula (I):
[CV a ] m -A-[CX b ] n —B—[CY c ] o -D-[CZ d ] p
wherein
C is a carbon atom;
V, X, Y and Z are independently selected from the group consisting of H, F and CI;
a & d are independently selected from the integral values ranging from 0 to 3 inclusive;
b & c are independently selected from the integral values ranging from 0 to 2 inclusive;
o, p & n are equal to 1;
m is selected from the integral values ranging from 0 to 1 inclusive;
A, B and D are covalent bonds sufficient to satisfy the available bonding sites of adjacent carbon atoms, if such carbon atoms are present;
said at least one blowing agent having a boiling point between approximately 5-50° C., and an ozone depletion potential of not greater than 0.05;
said foam system having a reaction profile gel and tack time which is approximately between 2-6 minutes and said foam system having a peak exotherm below a temperature at which the polymeric window lineal profile deforms, said times and temperature attributable at least in part to a “B-side” composition which comprises:
approximately between 0.4-2 weight % of at least one amine catalyst;
approximately between 3-20 weight % of a polyol blend;
approximately between 25-50 weight % of at least one phosphate flame retardant;
approximately between 30-58 weight % of at least one non-ionic surfactant;
a balance of water, said balance being no less than about 10-20 weight %;
components within said “B-side” composition adjusted to total 100%.
2. The process of claim 1 wherein
said amine catalyst is added at approximately between 0.5-1.5 weight % of said “B-side”.
3. The process of claim 1 wherein formula (I) is selected from the group consisting of
CHF 3 CH 2 CHF 3 , CH 3 CF 2 CH 2 CF 3 , trans-CF 3 CH═CHCl, cis-CF 3 CH═CHCF 3 , CF 3 CH═CHCl (E), miscible blends and azeotropes thereof and further wherein formula (I) is a major amount of said blowing agent.
4. The process of claim 3 wherein said blowing agent has
a boiling point between approximately 10-40° C.
5. The process of claim 4 wherein
a peak reaction exotherm is no higher than about 180° F. (82° C.).
6. The process of claim 5 wherein
said reaction profile gel and tack time is approximately between 2-4 minutes.
7. The process of claim 6 wherein said “B-side” catalyst further comprises:
at least three different catalysts.
8. The process of claim 1 said process further comprises the step of:
adding said frothable polyurethane or said polyisocyanurate foam precursor into a proximal side of said window lineal and allowing said polymerization to proceed toward a distal side of said window lineal, both said proximal and distal sides being open.
9. The process of claim 8 wherein
said step of adding to said window lineal has said window lineal in a horizontal position.
10. A process for filling a window lineal cavity with a frothable polyurethane or a polyisocyanurate foam system without deforming a polymeric window lineal profile, said process comprising the step of:
adding a two-component polyurethane or polyisocyanurate foam precursor to said cavity, said foam precursor comprising an effective amount of at least one blowing agent, including miscible blends and azeotropes thereof, said blowing agent comprising formula (II):
[CU e ] q -E-[CW f ] r —F—[CV a ] m -A-[CX b ] n —B—[CY c ] o -D-[CZ d ] p
wherein
C is a carbon atom;
U, W, V, X, Y and Z are independently selected from the group consisting of H, F and Cl;
d & e are independently selected from the integral values ranging from 0 to 3 inclusive;
a, b, c & f are independently selected from the integral values ranging from 0 to 2 inclusive;
o, p & n are equal to 1;
m, q & r are independently selected from the integral values ranging from 0 to 1 inclusive;
A, B, D, E and F are covalent bonds sufficient to satisfy the available bonding sites of adjacent carbon atoms, if such carbon atoms are present;
said at least one blowing agent having a boiling point between approximately 5-50° C., and an ozone depletion potential of not greater than 0.05;
said foam system having a reaction profile gel and tack time which is approximately between 2-6 minutes and said foam system having a peak exotherm below a temperature at which the polymeric window lineal profile deforms, said times and temperature attributable at least in part to a “B-side” composition which comprises:
approximately between 0.4-2 weight % of at least one amine catalyst;
approximately between 3-20 weight % of a polyol blend;
approximately between 25-50 weight % of at least one phosphate flame retardant;
approximately between 30-58 weight % of at least one non-ionic surfactant;
a balance of water, said balance being no less than about 10-20 weight %;
components within said “B-side” composition adjusted to total 100%.
11. The process of claim 10 wherein
said amine catalyst is added at approximately between 0.5-1.5 weight % of said “B-side”.
12. The process of claim 10 wherein formula (II) is selected from the group consisting of
CH 2 CH 2 CF 3 , CH 3 CF 2 CH 2 CF 3 , trans-CF 3 CH═CHCl, cis-CF 3 CH═CHCF 3 , CF 3 CH═CHCl (E), miscible blends and azeotropes thereof and further wherein formula (II) is a major amount of said blowing agent.
13. The process of claim 12 wherein said blowing agent has
a boiling point between approximately 10-40° C.
14. The process of claim 13 wherein
a peak reaction exotherm is no higher than about 180° F. (82° C.).
15. The process of claim 14 wherein
said reaction profile gel and tack time is approximately between 2-4 minutes.
16. The process of claim 15 wherein said “B-side” catalyst further comprises:
at least three different catalysts.
17. The process of claim 10 said process further comprises the step of:
adding said frothable polyurethane or said polyisocyanurate foam systcm precursor into a proximal side of said window lineal and allowing said polymerization proceed toward a distal side of said window lineal, both said proximal and distal sides being open.
18. The process of claim 17 wherein
said step of adding to said window lineal has said window lineal in a horizontal position.