Pvc membrane with reduced plasticizer migration
A technology of sealing layer and barrier layer, which is applied to roofs using flexible materials, devices for coating liquid on the surface, coatings, etc., can solve the basic properties of PVC web materials such as water impermeability, loss of elasticity and aging resistance, elasticity Reduce, crack and other problems, to achieve the effect of improving aging resistance and water impermeability, low plasticizer migration
Inactive Publication Date: 2014-12-17
SIKA TECH AG
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] Furthermore, migration causes a reduction of plasticizer in the PVC web, whereby its elasticity decreases drastically over time, making the web brittle, which sooner or later leads to cracking
Therefore, the migration of plasticizers results in the loss of the basic properties of PVC webs (i.e. water impermeability, elasticity and aging resistance)
Method used
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Experimental program
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Embodiment
[0096] Preparation of compositions Za and Zb
[0097] As the copolymer PA component of compositions Za and Zb was Soarnol D2908 or Soarnol D3808 commercially available from Nippon Gohsei Co., Japan. As solvent components are water and n-propanol. The two components were mixed with each other in the amounts given in Table 1 to form compositions Za and Zb in the parts by weight given in Table 1 .
[0098]
Za
Zb
Soarnol D2908
20
-
Soarnol D3808
-
20
water
16
16
n-propanol
64
64
sum of parts by weight
100
100
[0099] Table 1, Compositions Za and Zb.
[0100] Preparation of Polyurethane Dispersion Composition (PD)
[0101] The compounds shown in Table 2 were mixed with each other in parts by weight given in Table 2 to form polyurethane dispersion compositions PD1 and PD2. use W2400 (both from INCOREZ LTD, UK) and UH 2606 (Bayer Material Science, Germany) as polyurethan...
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Abstract
The present invention relates to a membrane comprising a bulkhead layer and a barrier layer. More than 50% by weight of the bulkhead layer is composed of PVC. The barrier layer can, on the one hand, be a barrier layer S1, wherein the barrier layer S1 has a polyvinyl alcohol layer comprising more than 50% by weight of copolymer PA, the polyvinyl alcohol layer is connected to the bulkhead layer by a polyurethane layer, and more than 10% by weight of the polyurethane layer is composed of polyurethane PUR. The barrier layer can, on the other hand, be a barrier layer S2, wherein the barrier layer S2 has a composition comprising 5-50% by weight of polyurethane PUR and 50-95% by weight of copolymer PA. The membranes according to the invention have significantly lower plasticizer migration compared to the membranes of the prior art and are characterized by improved resistance to aging, particularly as regards the adherence of the barrier layer on the bulkhead layer, and imperviousness to damp.
Description
technical field [0001] The invention relates to the field of sealing in the construction sector, in particular roof coverings. Background technique [0002] For sealing in the construction sector, especially roof coverings, PVC is an important component as a component of the sealing web. To control the processability of PVC, plasticizers have long been used. Plasticizers however have the great disadvantage of migration. That is, the plasticizer migrates over time to the surface on the one hand and causes surface tack on the surface, or migrates into the carrier that binds it to the substrate. Empirically, migration is further enhanced by high temperatures, for example by solar radiation. [0003] Furthermore, migration causes a reduction of plasticizer in the PVC web, whereby its elasticity decreases drastically over time, making the web brittle, which sooner or later leads to cracking. Thus, the migration of the plasticizer results in a loss of the basic properties of t...
Claims
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IPC IPC(8): C08J7/04E04D5/06E04D5/10C08J7/043
CPCC08J7/042E04D5/10C08J2327/06C08J2429/04C08J2475/04Y10T428/3158C08J7/0427C08J7/043B05D3/0406B05D3/0413B05D3/0473B05D3/065B05D3/066B05D7/544B05D7/546B05D3/0254B05D2503/00B05D2425/01B05D2520/10B05D2425/02
Inventor E·延都比C·凯尔贝
Owner SIKA TECH AG