Construction waterproofing web and method for producing a construction waterproofing web

Abstract

The invention relates to a waterproofing web (12, 16) of a single-layer or multi-layer web-like product (10) containing a polymer matrix and at least one stabilizer. The waterproofing web (12, 16) is plasticizer-free, contains thermoplastic polyurethane, and the polymer matrix is or contains vinyl chloride-acrylic ester graft copolymer.

Description

[0001] Description

[0002] Building waterproofing membrane and method for producing a building waterproofing membrane

[0003] The invention relates to a plasticizer-free building waterproofing membrane of a single- or multi-layer web-shaped building waterproofing membrane, containing a polymer matrix which is or contains vinyl chloride-acrylic acid ester graft copolymer, and at least one stabilizer.

[0004] The invention also relates to a method for producing a building waterproofing membrane consisting of a product material of a single-layer or multi-layer web-shaped product, wherein the product material contains a polymer matrix and at least one stabilizer.

[0005] In order to protect building surfaces in particular against weather influences and contact media, waterproofing membranes in the form of single- or multi-layer web-like products are used, which have at least one waterproofing membrane as a layer, which is based on PVC and can additionally contain a plasticizer as well as various stabilizers and fillers.

[0006] Due to the migration of the plasticizer, the sealing membrane becomes brittle, losing its flexibility and dimensional stability. The loss of mass leads to shrinkage, which is accompanied by a strong sensitivity to mechanical stress.

[0007] In order to prevent migration, EP 1 500 493 A1 proposes a multi-layer membrane with a non-metallic barrier layer running between an outer polymer layer and a bitumen layer.

[0008] WO 2019 / 077107 A1 discloses a structural waterproofing membrane comprising a waterproofing membrane located remote from the structure and an adjacent barrier layer located on the structure side, based on blends of homopolyamides and / or copolyamides. The waterproofing membrane is based on PVC-P. EP 1 444 158 A1 discloses a self-adhesive roof waterproofing membrane containing a monomeric plasticizer.

[0009] WO 2011 / 069680 A describes a multilayer film that can be used as a roof covering. One layer is designed as a barrier layer.

[0010] WO 2019 / 120731 A1 describes a multilayer sealing membrane for a building structure. It comprises outer layers, also referred to as sealing membranes, containing a base polymer and a plasticizer. Between the outer layers, there is a reinforcement insert in the form of a combination carrier insert comprising a glass fleece and a glass reinforcement.

[0011] A building waterproofing membrane is known from DE 102017 124619 Al, which has a polymeric plasticizer and an adjacent barrier layer based on polyamide or copolyamide.

[0012] A molded article based on vinyl chloride-acrylic acid ester graft copolymer according to EP 0 224 913 A2 can be processed into films, which are then thermoformed. The products are said to be characterized by the fact that plasticizer migration is largely prevented.

[0013] EP 4 071 213 A1 describes a plasticizer-free, flexible molding compound based on vinyl chloride-acrylic acid ester graft copolymers. Elastollan® can be used as a plasticizer.

[0014] A covering layer system according to EP 3 744519 A1 has a fleece layer to prevent migration of bitumen.

[0015] The present invention is based on the object of developing a structural waterproofing membrane, which is a layer of a waterproofing membrane, such as a roofing membrane, in such a way that it exhibits high aging resistance and does not decrease in flexibility over time, thus preventing hardening and thus not significantly affecting the notch impact sensitivity. To achieve this object, it is essentially proposed that the structural waterproofing membrane contain thermoplastic polyurethane (TPU) with a T content in wt.% between 1 and 20.

[0016] In particular, it is provided that the proportion T of thermoplastic polyurethane in wt. % is 1 ≤ T ≤ 20, in particular 5 ≤ T ≤ 15, preferably 10 ≤ T ≤ 15, particularly preferably 12 ≤ T ≤ 14, particularly particularly preferably T = 13 ± 0.5.

[0017] Surprisingly, it has been shown that the desired flexible properties and sufficient ageing resistance can be achieved with a plasticizer-free structural waterproofing membrane with vinyl chloride-acrylic acid ester graft copolymer as the polymer matrix material or as an essential component of the polymer matrix and the use of thermoplastic polyurethane (TPU).

[0018] The Shore A hardness measured according to DIN ISO 686 is between 60 and 80, especially between 65 and 75.

[0019] The advantages of roofing membranes containing plasticizers are maintained without hardening. Long storage times, even at elevated temperatures and humidity, are possible. The processing characteristics familiar from conventional roofing membranes are ensured, especially during installation and welding at overlapping membranes where surfaces, edges, and corners need to be sealed. Durability and recyclability are assured.

[0020] Migration cannot occur because plasticizers are not included, while the positive properties regarding flexibility, processing, durability and recyclability are maintained.

[0021] It is also unnecessary to use epoxidized soybean oil (ESO), which is used both as a co-stabilizer and co-plasticizer in common PVC-P (soft PVC) formulations. One advantage of this is that short-chain components resulting from the ESO cannot migrate or escape, as they are no longer present. A further advantage is that the elimination of plasticizers and ESO components eliminates the nutrients required for algae or bacterial growth, thus improving the resistance and durability of the waterproofing or roofing membrane, even on surfaces exposed to the elements.

[0022] In particular, it is provided that the proportion A of the polymer matrix consisting of vinyl chloride-acrylic acid ester graft copolymer or containing this in the sealing sheet is 50 wt.% ≤ A ≤ 90 wt.%, in particular 60 wt.% ≤ A ≤ 80 wt.%, preferably 62 wt.% ≤ A ≤ 78 wt.%, particularly preferably 68 wt.% ≤ A ≤ 74 wt.%.

[0023] Roofing membranes of corresponding compositions show the same advantages in terms of shear strength of the joint seam, folding in cold conditions, UV weathering, and perforation values ​​as those found in conventional PVC-based waterproofing membranes with a plasticizer.

[0024] There are also no differences in terms of tightness.

[0025] In particular, it is provided that plasticizer-free polyvinyl chloride is additionally contained with a proportion in wt.% between 1 and 30, preferably between 1 and 15, particularly preferably between 1 and 8.

[0026] Preferably, at least one stabilizer from the group of Ca / Zn stabilizer, organically based stabilizers, such as 6-amino-l,3-dimethyluracil, is provided, in particular Ca / Zn or organically based stabilizer as stabilizer.

[0027] The stabilizers used are usually one-pack stabilizers, meaning they already contain additives:

[0028] Ca / Zn from stearates, octoates, behenates, carboxylates;

[0029] (Ratio Ca:Zn = 2:1 to 1:1, preferably 2:1),

[0030] Hydrotalcites: preferred over zeolites due to lower water absorption and increased stability. In combination with Ca / Zn, they provide weather resistance, lubricants, processing aids for plants, antioxidants, increased thermal stability, flow aids, and incorporation and dispersion aids.

[0031] A carbodiimide or mixtures thereof can also be added as an additional stabilizer.

[0032] Stabilizers used in particular include those that increase thermal stability. Examples include Ba / Zn stabilizers, although Ca / Zn stabilizers or OBS stabilizers (organic-based stabilizers) are preferred. UV stabilizers such as oxalanilides, amides, HALS or NORHALS, titanium dioxide, or carbon black can also be added.

[0033] An organically stabilized stabilizer can also be used on its own or in combination with one or more other stabilizers.

[0034] The invention preferably provides that the proportion B of stabilizer in the sealing sheet is 1.5 wt.% ≤ B ≤ 18 wt.%, in particular 2 wt.% ≤ B ≤ 6 wt.%, particularly preferably 2 wt.% ≤ B ≤ 5 wt.%.

[0035] Proportion B of stabilizer means that the total proportion of stabilizers, be it one stabilizer, several stabilizers, or a one-pack stabilizer, has a corresponding proportion by weight.

[0036] The building waterproofing membrane according to the invention is a layer of a multi-layered web-like product, such as a roofing membrane, wherein the multi-layered web-like product preferably has a reinforcing layer, which can be designed as an insert, i.e. is itself surrounded by layers.

[0037] The reinforcement layer can be a nonwoven layer based on synthetic fibers, a glass fiber nonwoven layer, or a nonwoven layer made of synthetic fibers and glass fibers, as described, for example, in EP 3 744 519 A1. However, reinforcements based on woven fabrics, non-crimp fabrics, and / or raschel fabrics, as well as combination carrier inserts made of nonwoven and woven fabrics, non-crimp fabrics, and raschel fabrics, can also be used. The reinforcement layer can be made of any suitable material or materials used in the waterproofing membrane sector.

[0038] In particular, the layers enclosing a corresponding insert consist of sealing sheets according to the invention, which may have a different composition on the building side than on the non-building side.

[0039] Conventional fillers known from the state of the art can be used for the sealing membrane according to the invention. Examples include chalk, talc, silica, or kaolin.

[0040] Furthermore, one or more processing aids should be used, such as lubricants, e.g. Ca stearate, processing aids, such as those to increase the melt strength, to improve the metal release for improved wall sliding effect in the extruder, which is used as a co-stabilizer as well as co-plasticizer in common PVC-P (soft PVC) formulations, gelling aids, such as copolymers with acid-based groups or biocides.

[0041] It is preferably provided that the sealing sheet contains plasticizer-free polyvinyl chloride with a proportion P in wt.% with P ≤ 30, in particular 3 ≤ P ≤ 30, particularly preferably 1 ≤ P ≤ 15, very particularly preferably 1 ≤ P ≤ 8.

[0042] In particular, it is intended that the product material of the sealing membrane contains in wt.%:

[0043] Vinyl chloride-acrylic acid ester graft copolymer

[0044] 60-80, preferably 62-78, especially 68-74,

[0045] Polyvinyl chloride

[0046] 1-30, in particular 1-15, preferably 1-8,

[0047] Filler such as talc and / or chalk,

[0048] 1-10, especially 3-7,

[0049] Stabilizer, especially Ca / Zn stabilizer,

[0050] 1-6, especially 2-5, epoxidized soybean oil

[0051] 0-10, especially 2.5-10, preferably 0,

[0052] Pigment, such as soot,

[0053] 0-2, especially 0.5-1.5, impact modifiers, such as acrylate

[0054] 0-10, especially 1-5,

[0055] Processing aids (metal release agent), such as polyacrylate

[0056] 0-10, especially 1, 0-6,0, thermoplastic polyurethane

[0057] 1-20, in particular 5-15, preferably 10-15, particularly preferably 12-14, particularly particularly preferably 13±0.5.

[0058] In particular, it is intended that the sealing membrane is free of epoxidized soybean oil.

[0059] The sealing membrane is particularly characterized by the fact that the thermoplastic polyurethane is or contains a polyester-based thermoplastic polyurethane.

[0060] It is preferably provided that the thermoplastic polyurethane has a glass transition temperature TG with -60 °C ≤ TG ≤ -10 °C, in particular -50 °C < TG ≤ -15 °C, determined by dynamic differential calorimetry (DSC) according to DIN ISO DIN EN ISO 11357-1 (from -150 °C to 200 °C with a heating rate of 10 K / min).

[0061] Another advantage is that the TPU has a relatively low melting temperature.

[0062] This improves the miscibility between the vinyl chloride-acrylic acid ester graft copolymer and TPU, as the melting ranges are similar, resulting in good compatibility and processability, especially with regard to extrusion. With a high melting temperature of TPU, a certain amount of temperature or shear energy is required to achieve a meltable and flowable mass.

[0063] The TPUs used, especially polyester-based TPUs, can be aromatic or aliphatic TPUs.

[0064] Aliphatic TPUs do not oxidize under UV radiation, thus offering high color stability under It is characterized by a high impact strength and no yellowing. Aromatic TPUs, on the other hand, are not as resistant but exhibit increased flexibility. A TPU consists primarily of the following components:

[0065] Polyol or a long-chain diol,

[0066] Chain extender or short-chain diol, diisocyanate, or contains these as main components.

[0067] The component for the elastic properties is produced using the polyol and isocyanate and the toughness of the TPU comes from block copolymers consisting of soft and hard blocks.

[0068] There is also the possibility that bio-based TPU is also a biomass balanced (BMB) TPU.

[0069] The sealing sheet itself should preferably have a thickness of at least 1.2 mm, in particular between 1.2 mm and 2.0 mm.

[0070] For cost reasons, it would also be possible to combine vinyl chloride-acrylic acid ester graft copolymer layers with soft PVC layers. Compatibility and adhesion between vinyl chloride-acrylic acid ester graft copolymer and soft PVC are achieved without the need for an additional adhesion promoter.

[0071] It would also be possible to use a vinyl chloride-acrylic acid ester graft copolymer roofing membrane with a coating, such as a lacquer layer. Lacquer layers are known, preferably but not exclusively, to be based on PU and / or acrylate in the field of soft PVC and can also be applied to vinyl chloride-acrylic acid ester graft copolymer membranes without any complications or adverse effects.

[0072] The invention is also characterized by a composition containing vinyl chloride-acrylic acid ester graft copolymer as polymer matrix, optionally polyvinyl chloride, thermoplastic polyurethane, a filler such as CaCCh, processing aids for producing a sealing membrane, wherein the composition is free of epoxidized soybean oil.

[0073] Preferred compositions also arise from both the previous and the following explanations.

[0074] A method for producing a building waterproofing membrane consisting of a product material of a single-layer or multi-layer web-shaped product, wherein the product material contains a polymer matrix and at least one stabilizer, wherein the product material used is one which is plasticizer-free and contains or consists of vinyl chloride-acrylic acid ester graft copolymer as the material of the polymer matrix, is characterized in that the waterproofing membrane contains thermoplastic polyurethane (TPU) with a proportion T in wt.% between 1 ≤ T ≤ 20, in particular 5 ≤ T ≤ 15, preferably 10 ≤ T ≤ 15, particularly preferably 12 ≤ T ≤ 14, particularly particularly preferably T = 13 ± 0.5.

[0075] For production, in particular a dry blend or compounded product material, i.e. the starting composition, is processed into the sealing sheet at a temperature TV with 150 °C ≤ TV < 210 °C, in particular 160 °C ≤ TV ≤ 205 °C, particularly preferably 170 °C ≤ TV ≤ 190 °C, in particular by extrusion.

[0076] In another embodiment, the vinyl chloride-acrylic acid ester graft copolymer can be produced as prefabricated granules or compounds, with small components such as stabilizers and pigments already incorporated. This simplifies handling later on the extrusion line, which simplifies the dosing of powder into granules. Risks such as dust explosions are thus minimized.

[0077] Further details, advantages, and features of the invention emerge not only from the claims and the features derived therefrom—alone and / or in combination—but also from the following description. The single figure shows a section of a building waterproofing membrane 10. The main application of such building waterproofing membranes is the covering of roofs, basements, or pools, such as swimming pools, terraces, or parking areas.

[0078] In the exemplary embodiment, the building waterproofing membrane 10 consists of a waterproofing membrane 12 lying away from the building, a reinforcing insert 14 covered by this, and a second waterproofing membrane 16 covering this on the building side.

[0079] The sealing sheets 12 and 16 can have the same composition or different compositions, whereby the decisive factor is that each of the sealing sheets 12, 16 contains vinyl chloride-acrylic acid ester graft copolymer as the polymer matrix and TPU, but no plasticizer. Furthermore, polyvinyl chloride should also be included.

[0080] The insert 14 can be a nonwoven, a glass fabric, a combination carrier insert which, for example, has a glass nonwoven and a glass reinforcement or can consist of glass, mineral, polyester, polyamide, polyethylene, polypropylene fibers or mixtures thereof which form a nonwoven, a scrim or a fabric or are present in such.

[0081] The building-side sealing membrane 16 can furthermore have a cold-applied self-adhesive layer, allowing it to be applied to any substrate. The building-side surface of the second sealing membrane 16 can also be coated with a pressure-sensitive adhesive, which can be used in particular with acrylate or polyurethane-based adhesives.

[0082] The building-side sealing membrane 16 may also comprise a fleece.

[0083] The following examples illustrate that the use of TPU and without plasticizer results in a sealing membrane that meets the requirements of conventional sealing membranes that contain a plasticizer.

[0084] A total of eight different starting compositions were used to produce samples. The PVC-P BV sample (PVC = polyvinyl chloride; P = plasticized; BV = bitumen compatible) was a sample containing polymeric plasticizer according to the state of the art. Vinyl chloride-acrylic acid ester graft copolymer was not included.

[0085] Sample A did not contain PVC, but did contain vinyl chloride-acrylic acid ester graft copolymer, epoxidized soybean oil, and processing aids commonly used in the manufacture of roofing membranes. In this case, a polyacrylate was used as a processing aid.

[0086] Sample B contained vinyl chloride-acrylic acid ester graft copolymer and suspension PVC without plasticizers or processing aids. It also contained thermoplastic polyurethane (TPU), a blend of copolyester-TPU and polycaprolactone-TPU.

[0087] Compared to sample B, the starting mixture of sample C contained an acrylic-based processing aid.

[0088] Sample D differed from Sample B in that a TPU based on renewable raw materials was used. A similar TPU was also used in Sample E, which otherwise had a composition similar to Sample C.

[0089] All AE samples also contained a filler in the form of CaCCh and a Ca / Zn-based stabilizer.

[0090] Compared to the other samples, samples F and G contained an acrylate in addition to the processing aid. The filler was the same as in sample E, namely CaCO3. The processing aid content was lower than in sample E. A Ca / Zn-based stabilizer was used, although the proportion was higher than in samples B to E.

[0091] Sample F contained the same TPU content as samples B to E. The TPU content in sample G was lower than in the others. Furthermore, the PVC content in samples F and G was lower than in samples B to E. In contrast, samples F and G contained a higher vinyl chloride-acrylic acid ester graft copolymer content than samples B to E. The processing aids used should be acrylate-based. EM A (ethyl methyl acrylate), marketed by SK Functional Polymer under the name LOTRYL® 18MA02, is a possible processing aid.

[0092] Acrylic processing aids offer the following advantages:

[0093] - Increase in the degree of gelation and homogeneity of the melt Increase in melt strength

[0094] Increase in melt elongation / stretchability

[0095] - Increase in melt elasticity.

[0096] High-molecular-weight acrylic processing aids, such as copolymers or terpolymers, should be used. The use of the processing aids and their type depend on how the properties of the extruded roofing membrane are to be influenced; different chain lengths of the acrylic processing aid affect the extrudate differently.

[0097] The compositions of the samples can be found in Table I.

[0098] Table I

[0099] *The K value corresponds to the viscosity number and is a measure of the solution viscosity of different chain lengths

[0100] The raw materials of samples BE were homogenized in a kneader with roller blades from Brabender at 130 °C and a speed of 60 rpm for 2 min. and then further processed on the roller mill at 160 °C, friction 30%-60%, roller gap 0.5-0.6 mm, speed 5-15 rpm, in 4-8 min to form rolled sheets in order to obtain samples representing roofing membranes.

[0101] To produce samples F and G, the raw materials, i.e., starting substances, with the exception of TPU, were processed into granules in a compounder at a melting temperature of 150 °C. The granules were then processed with the TPU on a roller mill, as was the case for samples B to E.

[0102] Table II shows the processing temperatures in the roller mill as well as the properties determined on the samples and the test methods used.

[0103] Table II

[0104] *IRHD - International Rubber Hardness Degree

[0105] Furthermore, density value determinations were carried out according to DIN 1928. It was found that differences between the sealing membrane PVC-R-RV and the sealing membranes A to However, significant differences were observed in storage tests at 90 °C and 93% relative humidity.

[0106] As can be seen from Table III, the roofing membranes according to the invention containing TPU show a far lower weight loss than the other roofing membranes.

[0107] Table III

[0108] Storage at 90 °C 93 % relative humidity

[0109] Relevant differences in the glass transition temperature, determined by differential scanning calorimetry (DSC), were also observed. The lower the glass transition temperature (TG), the more flexible the products are at low temperatures, thus providing decisive advantages for roofing membranes made with the compositions of the invention.

[0110] The glass transition temperature TG, measured by DSC, for the samples: PVC-P-BV: approx. -9 °C

[0111] Sample A: approx. -15 °C

[0112] Sample B: approx. -15 °C

[0113] Sample D: approx. -16 °C

[0114] The tests show that roofing membranes without migrating plasticizers retain the positive properties of PVC-P-BV in terms of flexibility, processing, durability and recyclability.

[0115] Particularly good results can be achieved when TPU is used in addition to the vinyl chloride-acrylic acid ester graft copolymer. Polyester TPUs are preferred, and both aromatic and aliphatic TPUs can be used.

[0116] Tests using extruders to produce samples have shown that, with the exception of Sample A, the same processing temperatures can be used, so it is advantageous not to use epoxidized soybean oil. The non-use of soybean oil therefore has a positive effect, as it can migrate like a plasticizer, causing the surface of the roofing membrane to become sticky and thus more easily soiled.

[0117] It is particularly advantageous if semi-crystalline TPU is used, as was the case with samples D and E.

[0118] Bio-TPU is particularly preferred. PVC should also be included in the composition, as shown in Table II, to achieve good material properties. The TPU used in samples B and C was amorphous and had a glass transition temperature (TG) of approximately -19 °C, determined by the differential scanning calorimetry (DSC) method.

[0119] Samples D and E used semi-crystalline TPU, whose glass transition temperature (TG) determined by DSC was approximately -44 °C. The melting temperature was in the range of 63 °C.

[0120] The TPU for samples B and C is characterized by the following material properties: specific density

[0121] 1.16 g / cm 3 determined according to ISO 2781, Shore hardness

[0122] 70, in unit A, determined according to ISO 868,

[0123] - Melt viscosity

[0124] (160 °C, 2.1 kg) determined ISO 1133:890 Pa x s.

[0125] Melt flow index MFI

[0126] (160 °C / 2.16 kg) determined according to ISO 1133: 11 g / 10 min

[0127] The TPU consisted of a mixture of copolyester TPU and polycaprolactone TPU.

[0128] For samples D and E, a bio-based TPU was used, i.e. one that contained a high proportion of renewable raw materials, in a range between 60 and 70 wt%.

[0129] The TPU’s characteristics were:

[0130] Melt flow index (MFI according to ISO 1133 (170 °C / 2.16 kg)): 30 g - 60 g / 10 min,

[0131] - specific density measured according to ISO 2781: 1.19g / cm 3 .

[0132] Another advantage of the plasticizer-free waterproofing membrane with vinyl chloride-acrylic acid ester graft copolymer is the absence of hydrolysis. This makes it suitable for processing and use in tropical regions.

[0133] Another advantage is its resistance to materials commonly found in the construction industry, such as bitumen and / or expanded polystyrene. Due to the potential interaction of plasticized PVC-P roofing membranes, particularly compatible plasticizers, such as polymeric plasticizers, are typically used, which offer migration stability.

[0134] For short-chain plasticizers, also called monomeric plasticizers, such as phthalates such as DINP, DPHP, separating layers are normally required, e.g. made of polyester fleece of approx. > 200 g / m 2 , for example with EPS (expanded polystyrene), or also bitumen-based underlays or insulation layers or substrates.

[0135] Compared to PVC-P BV seals, the sealing membranes based on vinyl chloride-acrylic acid ester graft copolymer without TPU are somewhat stiffer. This is especially true when epoxidized soybean oil (ESO) is used as a co-stabilizer. However, this is barely noticeable in samples containing TPU. Irrespective of this, the corresponding membranes according to the invention are still more flexible than commercially available TPO sealing membranes. In TPO seals, the matrix is ​​a thermoplastic elastomer based on polyolefins. TPO seals have the major advantage over PVC-P BV seals in that no plasticizer migration can occur, which means that the level of properties remains at a high level over time. However, the fire behavior of the TPO membranes is poor. Only with the addition of large quantities of flame retardants (approximately 30 wt.%) can the fire tests be passed.Here, the waterproofing made of vinyl chloride-acrylic acid ester graft copolymer has the advantage that its fire behavior corresponds to that of waterproofing made of PVC-P BV.

[0136] Particularly good results can be achieved if the initial composition does not contain ESO.

[0137] Tests were also carried out to determine whether the welding properties of roofing membranes manufactured according to the inventive formulations in samples F and G differed from those made of PVC-P-BV. For this purpose, manual welding was carried out at a welding temperature of 450 °C. No differences were observed.

[0138] Therefore, no other welding parameters need to be taken into account for welding roofing membranes according to the invention compared to standard roofing membranes.

[0139] Furthermore, odor tests were conducted on the welds. No differences were observed between the roofing membranes according to the invention and standard PVC-P-BV roofing membranes.

[0140] Visually, there were slight differences. It was observed that, when welded, the seam edges of the PVC-P-BV membranes appeared glossy, whereas the seam edges of the roofing membranes according to the invention appeared rather matte.

[0141] Tests were also conducted regarding the water absorption of the roofing membranes according to the invention, taking into account the UEAtc guideline for PVC. The water absorption of sample G was found to be 1.4%. Water absorption is determined by first storing the sample in water and then drying it until constant weight is reached. According to the UEAtc guideline, water absorption must be < 2%, so the roofing membranes according to the invention comply with this guideline.

Claims

Patent claims Building waterproofing membrane and method for producing a building waterproofing membrane 1. Plasticizer-free structural waterproofing membrane (12, 16) of a single- or multi-layer structural waterproofing membrane (10), containing a polymer matrix which is or contains vinyl chloride-acrylic acid ester graft copolymer, and at least one stabilizer, characterized in that the structural waterproofing membrane contains thermoplastic polyurethane (TPU) with a proportion T in wt.% between 1 and 20.

2. Building waterproofing membrane according to claim 1, characterized in that the proportion T of thermoplastic polyurethane in wt.% is 5 ≤ T < 15, preferably 10 ≤ T ≤ 15, particularly preferably 12 ≤ T ≤ 14, in particular particularly preferably T = 13 ± 0.

5.

3. Building waterproofing membrane according to claim 1 or 2, characterized in that the proportion A of the polymer matrix consisting of vinyl chloride-acrylic acid ester graft copolymer or containing this in the waterproofing membrane is 50 wt.% ≤ A ≤ 90 wt.%, in particular 60 wt.% ≤ A ≤ 80 wt.%, preferably 62 Wt% ≤ A ≤ 78 wt%, particularly preferably 68 wt% ≤ A ≤ 74 wt%.

4. Building waterproofing membrane according to at least one of the preceding claims, characterized in that the waterproofing membrane contains plasticizer-free polyvinyl chloride with a proportion P in wt. % with P ≤ 30, in particular 3 ≤ P ≤ 30, particularly preferably 3 ≤ P ≤ 20, very particularly preferably 1 ≤ P ≤ 15, particularly preferably 1 ≤ P ≤ 8.

5. Building waterproofing membrane according to at least one of the preceding claims, characterized in that in wt.% the proportion B of stabilizer in the waterproofing membrane (12, 16) is 1.5 wt.% ≤ B ≤ 18 wt.%, preferably 2 wt.% ≤ B ≤ 6 wt.%, particularly preferably 2 wt.% ≤ B ≤ 5 wt.%.

6. Building waterproofing membrane according to at least one of the preceding claims, characterized in that the waterproofing membrane (12, 16) contains product material in % by weight: Vinyl chloride-acrylic acid ester graft copolymer 50-90, preferably 60-80, preferably 62-78, especially 68-74, polyvinyl chloride 1-30, preferably 3-20, in particular 1-15, particularly preferably 1-8, filler 1-10, especially 3-7, Stabilizer, in particular Ca / Zn stabilizer, 1.5-5, in particular 2-5, epoxidized soybean oil 0-10, especially 2.5-10, preferably 0, Pigment, such as soot, 0-2, especially 0.5-1.5, Impact modifiers such as acrylate, 0-10, especially 1-5, Processing aids such as polyacrylate, 0-2, especially 1-6, preferably 3-6, Thermoplastic polyurethane, in particular polyester TPU, 1-20, in particular 5-15, preferably 10-15, particularly preferably 12-14, especially particularly preferably 13±0.

5.

7. Building waterproofing membrane according to at least one of the preceding claims, characterized in that the at least one stabilizer is at least one stabilizer from the group Ca / Zn one pack stabilizer or organically based stabilizer.

8. Building waterproofing membrane according to at least one of claims 1 to 6, characterized in that the waterproofing membrane is free from epoxidized soybean oil.

9. Building waterproofing membrane according to at least one of the preceding claims, characterized in that the thermoplastic polyurethane is or contains a polyester-based thermoplastic polyurethane.

10. Building waterproofing membrane according to at least one of the preceding claims, characterized in that the thermoplastic polyurethane has a glass transition temperature TG of -60 °C ≤ TG ≤ -10 °C, in particular -50 °C ≤ TG ≤ -15 °C.

11. Building waterproofing membrane according to at least one of the preceding claims, characterized in that the thermoplastic polyurethane is a biothermoplastic polyurethane.

12. Building waterproofing membrane according to at least one of the preceding claims, characterized in that the waterproofing membrane (12, 16) is at least one layer of the multi-layered, web-shaped product.

13. Building waterproofing membrane according to at least one of the preceding claims, characterized in that the waterproofing membrane (12, 16) is at least one outer layer of the web-shaped product, which has a reinforcing layer, in particular in the form of an insert (14).

14. Building waterproofing membrane according to at least one of the preceding claims, characterized in that the waterproofing membrane (12, 16) has a thickness of at least 1.2 mm, in particular a thickness between 1.2 mm and 2.00 mm.

15. A method for producing a building waterproofing membrane (12, 16) consisting of a product material, a single- or multi-layer web-shaped building waterproofing membrane (10), in particular according to at least claim 1, wherein the product material contains a polymer matrix and at least one stabilizer, wherein the product material used is one which is plasticizer-free and contains vinyl chloride-acrylic acid ester graft copolymer as the material of the polymer matrix, characterized in that the product material used is one which contains thermoplastic polyurethane with a weight fraction T in wt.% with 1 ≤ T ≤ 20, wherein preferably either a dry blend is produced by mixing materials containing the product material at a temperature TD with 100 °C ≤ TD ≤ 130 °C or the product material is compounded at a temperature TC with 160 °C ≤ TC ≤ 180 °C and then the waterproofing membrane, preferably by Extrusion, is produced.

16. A method for producing a building waterproofing membrane according to claim 15, characterized in that the dry blend or the compounded product material is processed into the sealing balm (12, 16) at a temperature TV with 150 °C ≤ TV ≤210 °C, in particular 160 °C ≤ TV ≤ 205 °C, particularly preferably 170 °C ≤ TV ≤190 °C, in particular by extrusion.

17. Composition for producing a building waterproofing membrane containing vinyl chloride-acrylic acid ester graft copolymer as polymer matrix, optionally polyvinyl chloride, thermoplastic polyurethane with a weight fraction T in wt.% with 1 ≤ T ≤ 20, a filler such as CaCCh, processing aids, wherein the composition is free from epoxidized soybean oil.

18. Composition according to claim 17, characterized in that the proportion T of thermoplastic polyurethane in wt. % is 1 ≤ T < 20, in particular 5 ≤ T ≤ 15, preferably 10 ≤ T ≤ 15, particularly preferably 12 ≤ T < 14, especially particularly preferably T = 13 ± 0.

5.

19. Composition in wt.%: Vinyl chloride-acrylic acid ester graft copolymer 50-90, preferably 60-80, in particular 62-78, particularly preferably 68-74, Polyvinyl chloride 1-30, preferably 1-15, especially 1-8, Filler, such as CaCCh, 1-10, especially 2-7, Stabilizer, especially Ca / Zn stabilizer, 1-6, especially 2-5, epoxidized soybean oil 0-10, preferably 0, Pigment, such as soot, 0-2, especially 0.5-1, 5, Impact modifiers such as acrylate, 0-10, especially 1-5, Processing aids (metal release agent), such as polyacrylate 0-10, especially 1-6, Thermoplastic polyurethane, especially polyester TPU, 1-20, in particular 5-15, preferably 10-15, particularly preferably 12- 14, particularly preferably 13±0.5, plasticizers 0.

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