Roofing membranes and methods for constructing
Embodiments of the invention provide improved roofing membranes and methods and systems involving the same. According to one embodiment, a roofing membrane laminate is provided. The roofing membrane laminate includes a first membrane layer that includes a thermoplastic polyolefin material and a second membrane layer positioned atop the first membrane layer and bonded thereto. The second membrane layer includes a thermoplastic polyolefin material and an acrylate additive blended with the thermoplastic polyolefin material. The acrylate additive is blended with the thermoplastic polyolefin material while both materials are resins and is added so as to comprise 10% by weight or less of the blended resins. The acrylate additive includes an ethylene backbone chain and an acrylate bonded with the ethylene backbone chain.
1. A roofing membrane laminate having improved heat reflective properties, the roofing membrane laminate comprising:
a first membrane layer, the first membrane layer comprising thermoplastic polyolefin; and
a second membrane layer positioned atop the first membrane layer and bonded thereto, wherein the second membrane layer comprises:
thermoplastic polyolefin; and
a copolymer additive blended with the thermoplastic polyolefin, the copolymer additive being blended with the thermoplastic polyolefin while both materials are a resin so as to comprise 10% by weight or less of the blended resin, wherein the copolymer additive includes:
an ethylene backbone chain bonded with the thermoplastic polyolefin; and
an acrylate bonded with the ethylene backbone chain.
2. The roofing membrane laminate of claim 1 , wherein the acrylate is included or incorporated within the ethylene backbone chain.
3. The roofing membrane laminate of claim 2 , wherein the acrylate is further bonded or grafted with the ethylene backbone chain as a pendant group.
4. The roofing membrane laminate of claim 1 , wherein the acrylate is bonded or grafted with the ethylene backbone chain as a pendant group.
5. The roofing membrane laminate of claim 1 , wherein the copolymer additive is blended with the thermoplastic polyolefin so as to comprise 5% by weight or less of the blended resin.
6. The roofing membrane laminate of claim 1 , wherein the copolymer additive is blended with the thermoplastic polyolefin so as to comprise 3% by weight or less of the blended resin.
7. The roofing membrane laminate of claim 1 , wherein the copolymer additive further comprises maleic anhydride bonded with the ethylene backbone chain.
8. The roofing membrane laminate of claim 7 , wherein a fire retardant is bonded with the maleic anhydride pendant group.
9. The roofing membrane laminate of claim 1 , further comprising a third membrane layer, wherein the third membrane layer comprises thermoplastic polyolefin, and wherein the first and second membrane layers are positioned atop and bonded with the third membrane layer.
10. A roofing membrane comprising:
a thermoplastic polyolefin material; and
an acrylate additive blended with the thermoplastic polyolefin material, the acrylate additive being blended with the thermoplastic polyolefin material while both materials are in a resin form such that the acrylate additive comprises 10% by weight or less of the blended resins.
11. The roofing membrane of claim 10 , wherein the thermoplastic polyolefin material comprises polyethylene or polypropylene or a combination thereof.
12. The roofing membrane of claim 10 , wherein the acrylate additive comprises:
an ethylene chain; and
an acrylate bonded with the ethylene chain.
13. The roofing membrane of claim 10 , wherein the acrylate additive is blended with the thermoplastic polyolefin material so as to comprise 5% by weight or less of the blended resins.
14. The roofing membrane of claim 12 , wherein the acrylate additive further comprises a maleic anhydride bonded with the ethylene chain.
15. The roofing membrane of claim 14 , wherein the maleic anhydride is bonded with the ethylene chain so as to comprise between about 2-5% by weight of the compound chain.
16. The roofing membrane of claim 14 , wherein a fire retardant is bonded with the maleic anhydride.
17. The roofing membrane of claim 16 , wherein the fire retardant comprises magnesium hydroxide.
18. The roofing membrane of claim 10 , wherein the acrylate additive is disposed toward a surface of the roofing membrane so as to form a polyacrylate coating, layer, or finish on the surface of the roofing membrane.
19. A method of making a roofing membrane comprising:
providing a thermoplastic polyolefin material;
blending an acrylate additive with the thermoplastic polyolefin material so that the acrylate additive comprises 10% by weight or less of the blended material, the acrylate additive comprising:
an ethylene chain; and
an acrylate group bonded with the ethylene chain; and
forming the blended material into a substantially flat sheet.
20. The method of claim 19 , wherein the method further comprises blending the acrylate additive with the thermoplastic polyolefin material so that the acrylate additive comprise 5% by weight or less of the blended material.
21. The method of claim 19 , wherein the acrylate additive further comprises a maleic anhydride bonded with the ethylene chain, and wherein the method further comprises: blending a fire retardant with the thermoplastic material, wherein the fire retardant bonds with the maleic anhydride.
22. The method of claim 19 , wherein forming the blended material into a substantially flat sheet comprises extruding the blended material through a die, wherein the acrylate additive migrates toward a surface of the blended material so that the roofing membrane comprises a polyacrylate coating, layer, or finish on the surface.
23. The method of claim 19 , wherein the method further comprises coupling the roofing membrane with a roof surface.
24. The method of claim 23 , wherein the method further comprises overlaying a portion of the roofing membrane with an additional roofing membrane and heat welding the two roofing membranes together.