Bonding adhesive and adhered roofing systems prepared using the same
A method is provided for forming an adhered membrane roof system that meets Factory Mutual (FM) 4470/4474 standards for wind uplift. The method comprises applying a bond adhesive to a substrate on a roof to form an adhesive layer and applying a membrane directly to the adhesive layer. The bond adhesive includes a moisture-curable polymer.
1 . A method for forming an adhered membrane roof system that meets FM 4474 standards for wind uplift, the method comprising:
(i) applying a bond adhesive to an asphalt-based substrate on a roof to form an adhesive layer, where the bond adhesive includes a silyl-terminated polymer and a hydrocarbon tackifier resin, and where the bond adhesive is devoid of phenolic resin; and
(ii) applying a roofing membrane directly to the adhesive layer, whereby a bond is formed between the substrate and the membrane that exceeds 1 pli, when measured according to ASTM D1876, where the roofing membrane is a thermoplastic olefin or EPDM membrane.
2 . The method of claim 1 , where the thickness of the adhesive layer is at least 5 mils and less than 30 mils.
3 . The method of claim 1 , where the step of applying the bond adhesive includes atomizing the adhesive and spraying the atomized adhesive onto the substrate, pumping the adhesive through a power roller onto the substrate, gravity feeding the adhesive through a drop spreader onto the substrate, or squeezing the adhesive onto the substrate.
4 . The method of claim 1 , where the bond adhesive has a dynamic viscosity of less than 13,000 cPs by using a Brookfield viscometer equipped with a #6 spindle operating at room temperature and 10 rpm and a static viscosity of from about 3600 to about 24,000 cPs by using a Brookfield viscometer equipped with a #6 spindle operating at room temperature and 2 rpm, and the bond adhesive is applied to the substrate at an application rate of at least 50 square feet per gallon of bond adhesive.
5 . A method for forming an adhered membrane roof system that meets FM 4474 standards for wind uplift, the method comprising:
(i) applying a bond adhesive to an asphalt-based substrate on a roof to form an adhesive layer, where the bond adhesive includes a silyl-terminated polymer and a low VOC-generating moisture scavenger, where the low VOC-generating moisture scavenger is a silane including at least one organo functional group and at least one hydrolysable group that, upon hydrolysis, does not generate methanol; and
(ii) applying a roofing membrane directly to the adhesive layer, whereby a bond is formed between the substrate and the membrane that exceeds 1 pli, when measured according to ASTM D1876, where the roofing membrane is a thermoplastic olefin or EPDM membrane.
6 . The method of claim 5 , where the bond adhesive is devoid of solvent.
7 . The method of claim 5 , where the step of applying a bond adhesive to an asphalt-based substrate is conducted at an application rate of at least 50 square feet per gallon of bond adhesive.
8 . A method for forming an adhered membrane roof system that meets FM 4474 standards for wind uplift, the method comprising:
(i) applying a bond adhesive to an asphalt-based substrate on a roof, where the bond adhesive includes a silyl-terminated polymer and a non-phthalate plasticizer; and
(ii) applying a roofing membrane directly to the adhesive layer, whereby a bond is formed between the substrate and the membrane that exceeds 1 pli, when measured according to ASTM D1876, where the roofing membrane is a thermoplastic olefin or EPDM membrane.
9 . The method of claim 8 , where the non-phthalate plasticizer is selected from glycol ethers and glycol ether esters.
10 . The method of claim 8 , where the bond adhesive has a dynamic viscosity of less than 13,000 cPs by using a Brookfield viscometer equipped with a #6 spindle operating at room temperature and 10 rpm and a static viscosity of from about 3600 to about 24,000 cPs by using a Brookfield viscometer equipped with a #6 spindle operating at room temperature and 2 rpm.
11 . The method of claim 8 , where applying the bond adhesive includes atomizing the adhesive and spraying the atomized adhesive onto the substrate, pumping the adhesive through a power roller onto the substrate, gravity feeding the adhesive through a drop spreader onto the substrate, or squeezing the adhesive onto the substrate.
12 . The method of claim 1 , where the bond adhesive comprises at least 1 wt. % of the hydrocarbon tackifier, based upon the entire weight of the adhesive composition.
13 . The method of claim 1 , where the roofing membrane is an EPDM membrane having a thickness of at least 45 mil±10%.
14 . The method of claim 5 , where the roofing membrane is an EPDM membrane having a thickness of at least 45 mil±10%.
15 . The method of claim 8 , where the roofing membrane is an EPDM membrane having a thickness of at least 45 mil±10%.
16 . The method of claim 1 , where the application of the bond adhesive is sufficient to form a dried layer having a dry-film thickness of from about 3 to about 35 mils.
17 . The method of claim 5 , where the application of the bond adhesive is sufficient to form a dried layer having a dry-film thickness of from about 3 to about 35 mils.
18 . The method of claim 8 , where the application of the bond adhesive is sufficient to form a dried layer having a dry-film thickness of from about 3 to about 35 mils.