A self-adhesive vapor barrier film

Abstract

The application discloses a self-adhesive vapor barrier film, comprising a first vapor barrier layer and a second vapor barrier layer, wherein the first vapor barrier layer is a multilayer composite film for preventing self tearing and breaking; the second vapor barrier layer is a glue layer coated on the first vapor barrier layer for forming a wrapping seal for a penetrating object, and the other side of the second vapor barrier layer is provided with an anti-adhesion layer; the multilayer composite film comprises one or more resin layers, and further comprises one or both of a metal layer and a mesh cloth layer; the vapor barrier film has good vapor barrier performance, stability and mechanical properties, is convenient to construct, provides a better vapor barrier material for a profiled steel sheet roof, and can improve the effect and service life of a roof maintenance system.

Description

Technical Field

[0001] This invention relates to the field of vapor barrier technology, and more particularly to a self-adhesive vapor barrier. Background Technology

[0002] A vapor barrier is a structural layer that prevents indoor water vapor from penetrating into the insulation layer. JGJ / T 316-2013, "Technical Specification for Single-Layer Waterproof Roofing Engineering," stipulates that a vapor barrier should be installed when the actual vapor permeation resistance on the inner side of the condensation interface of the roof structure in severely cold and cold regions is less than the required value, or when indoor moisture in other regions may penetrate the roof structure layer into the insulation layer.

[0003] Corrugated steel sheets are lightweight, high-strength, easy to install, and quick to install, making them widely used in industrial and civil buildings. Common vapor barrier materials for corrugated steel sheets include polyethylene film, composite aluminum foil, and coatings. When using polyethylene film as a vapor barrier, the film is loosely laid on the corrugated steel sheet. This loose laying allows water vapor to move freely throughout the roof. If any part of the polyethylene film is damaged, water vapor will condense throughout the entire roof. Furthermore, although PE vapor barriers consider overlap, the difficulty in handling detailed joints, coupled with varying skill levels among on-site workers, makes it almost impossible to guarantee the continuity of the vapor barrier. Therefore, indoor hot steam can penetrate into the insulation layer through the gaps in the PE vapor barrier, reducing the insulation performance of the insulation cotton and affecting the roof maintenance system. When using composite aluminum foil as a vapor barrier, its negative impact on the roof maintenance system is similar to that of polyethylene film. When using coatings as a vapor barrier for corrugated steel sheets, the quality of the coating application has a significant impact on the vapor barrier effect, especially at the steel sheet joints where the coating is difficult to apply evenly, failing to form an effective seal.

[0004] Chinese Patent CN 112440541 A (Zhuobao) discloses a method for preparing and applying a vapor barrier membrane. The vapor barrier membrane includes a resin layer, a metal layer, a chemically treated layer, and a vapor barrier layer arranged sequentially. The material of the vapor barrier layer includes butyl rubber modified asphalt. Choosing butyl rubber modified asphalt as the vapor barrier layer of the vapor barrier membrane gives the membrane excellent air tightness and water tightness due to butyl rubber, as well as excellent aging resistance and tensile strength due to the combination of butyl rubber and asphalt.

[0005] Chinese patent CN 109914714A discloses a modified asphalt self-adhesive waterproof vapor barrier membrane based on molecular discrete polymerization, comprising a roll and an asphalt layer. An aluminum foil layer is bonded to the bottom of the asphalt layer, and a polymer layer is bonded to the bottom of the aluminum foil layer. The polymer layer has grooves formed in a 3:5-4:5 ratio. The grooves are square, and the four sides of the grooves are chamfered at 30-50 degrees. This invention has a scientifically sound structure, is safe and convenient to use. The aluminum foil layer facilitates improved fire resistance and waterproofing. The polymer layer controls the types and arrangements of atoms in the chain, the types of substituents and end groups, the arrangement order of monomer units, and the type and length of branches, thereby improving its flexibility. Furthermore, the floating and sinking weaving of the braided layer improves the overall toughness and tensile strength of the vapor barrier membrane, extending its service life. The sponge layer improves the contact between the vapor barrier membrane and the installation location during installation, thus expanding its application range. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by providing a self-adhesive vapor barrier membrane.

[0007] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0008] A self-adhesive vapor barrier membrane includes a first vapor barrier layer and a second vapor barrier layer. The first vapor barrier layer is a multilayer composite membrane used to prevent itself from tearing and breaking. The second vapor barrier layer is an adhesive layer coated on the first vapor barrier layer to form a seal around the penetrating object and prevent water vapor from passing through.

[0009] Furthermore, the multilayer composite film includes one or more resin layers, wherein the resin layer is a thermoplastic resin, including but not limited to one of polyolefin, polyester, polyamide, EVOH, and PVDC.

[0010] Furthermore, the multilayer composite film also includes one or both of a metal layer and a mesh fabric layer;

[0011] The metal layer is either aluminum foil or copper foil; it includes, but is not limited to, aluminum foil or copper foil, and other metal materials may also be selected to make the metal layer.

[0012] The mesh fabric layer is either polyester mesh fabric or glass fiber mesh fabric.

[0013] Furthermore, the fabric weight of the mesh is 30–200 g / m². 2 The mesh size is 2mm*2mm to 8mm*8mm.

[0014] Furthermore, the multilayer composite film has 2-11 layers and is prepared by adhesive bonding or co-extrusion bonding.

[0015] Preferably, the multilayer composite film has two or three layers;

[0016] The two-layer composite film consists of a first resin layer and a second resin layer, wherein the first resin layer and the second resin layer are preferably polypropylene.

[0017] The three-layer composite membrane consists of a first resin layer, a metal layer, and a mesh layer, in sequence. The first resin layer is preferably polyethylene terephthalate, with a thickness of 0.001 mm to 0.004 mm. The mesh layer is preferably polyester mesh, with a basis weight of 60 to 120 g / m². 2 The mesh size of the mesh fabric is 3mm*3mm.

[0018] Furthermore, the thickness of the self-adhesive vapor barrier is 0.3 mm to 2.0 mm. Preferably, the thickness of the self-adhesive vapor barrier is 0.5 mm or 0.6 mm.

[0019] Furthermore, the thickness of the first vapor barrier is 0.1 mm to 0.3 mm; the thickness of the metal layer is 0.007 mm to 0.15 mm.

[0020] Furthermore, an anti-sticking layer is provided on the other side of the second vapor barrier layer. The anti-sticking layer is a release film or release paper used to prevent itself from sticking together.

[0021] Furthermore, the adhesive layer is one of self-adhesive modified asphalt, butyl rubber, and pressure-sensitive adhesive.

[0022] Furthermore, the self-adhesive modified asphalt comprises the following components: asphalt, wetting and tackifying agent, first crosslinking agent and second crosslinking agent; the first crosslinking agent is an inorganic layered compound modified with an aminosilane coupling agent, and the second crosslinking agent is SEBS-g-MAH.

[0023] Furthermore, the self-adhesive modified asphalt comprises the following components by weight: 50-65 parts asphalt, 2-10 parts SIS, 5-15 parts SBS, 2-6 parts tackifying resin, 1-10 parts compatibilizer, 4-15 parts softener, 1-6 parts wetting and tackifying agent, 4-10 parts first crosslinking agent, 2-8 parts second crosslinking agent, and 5-20 parts filler.

[0024] Furthermore, the asphalt is one or both of No. 90 asphalt and No. 70 asphalt.

[0025] The SIS is one or both of star-shaped SIS and linear SIS; preferably, the SIS is linear SIS with a St content ≤15%.

[0026] The SBS is one or both of star-shaped SBS and linear SBS; preferably, the SBS is a blend of star-shaped SBS and linear SBS, with a blending ratio of star-shaped SBS:linear SBS = 1:1.5 to 3.4 by weight; preferably, the ratio of star-shaped SBS:linear SBS = 1:2.3 is optimal; the St of star-shaped SBS is optimally 30%.

[0027] The tackifying resin is one or more of petroleum resin, rosin resin, terpene resin, and coumarone resin; preferably, the tackifying resin is C5 petroleum resin.

[0028] The compatibilizer is an aromatic oil with an aromatic content of ≥85% and a flash point of not less than 220℃. Aromatics can increase the compatibility of SBS, SIS and asphalt, improve the solubility of SBS and SIS, and allow the SBS and SIS macromolecular chains to fully unfold.

[0029] The softener is one or both of the following: reduced-pressure oil and reduced-pressure oil; preferably, the softener is reduced-pressure oil.

[0030] The wetting and tackifying agent is pentaerythritol polyisobutylene succinate; preferably, the molecular weight of pentaerythritol polyisobutylene succinate is 1300-2600.

[0031] The filler is one or more of the following: 400-600 mesh light calcium carbonate, heavy calcium carbonate, talc, and kaolin, to ensure the airtightness of the product.

[0032] Furthermore, the first crosslinking agent is an inorganic layered compound modified with an aminosilane coupling agent, wherein the aminosilane coupling agent modified inorganic layered compound is one or more of talc, mica, graphite, montmorillonite, and hydrotalcite; preferably, hydrotalcite modified with an aminosilane coupling agent is the best.

[0033] Furthermore, the second crosslinking agent is SEBS-g-MAH (maleic anhydride-grafted styrene-ethylene-butadiene-styrene copolymer), with a maleic anhydride grafting rate of 1.2% to 1.6%.

[0034] Furthermore, the method for preparing the self-adhesive modified asphalt includes the following steps:

[0035] (1) The second crosslinking agent SEBS-g-MAH was added to 2 / 3 of the softener for pre-swelling for 8 hours to improve the dissolution effect of SEBS-g-MAH and obtain a pre-swelling solution;

[0036] (2) Heat the asphalt to 160°C, add compatibilizer and 1 / 3 softener, then raise the temperature to 180°C and stir evenly to obtain a mixed solution.

[0037] (3) Control the temperature of the mixed solution to 180-190℃, add SBS and SIS in sequence, stir evenly, and after SBS and SIS have completely swollen and dissolved, add the pre-swollen solution and stir evenly.

[0038] (4) Control the temperature of the mixed solution to 150-160℃, continue to add the first crosslinking agent, stir evenly, then add the wetting and tackifying agent and tackifying resin, stir evenly, and finally add the filler and stir evenly to obtain self-adhesive modified asphalt.

[0039] Furthermore, the method for preparing the self-adhesive vapor barrier membrane includes the following steps:

[0040] (1) Prepare self-adhesive modified asphalt according to the above scheme;

[0041] (2) The temperature of the self-adhesive modified asphalt is controlled at 150℃~160℃. The self-adhesive modified asphalt is coated on the first vapor barrier layer and then covered with an anti-adhesive layer to obtain the self-adhesive vapor barrier film.

[0042] The beneficial effects of adopting the above technical solution are as follows:

[0043] The self-adhesive vapor barrier membrane of this invention has a multi-layer structure, which gives it excellent mechanical properties, high nail tear strength, strong peel strength, tensile strength and deformation resistance. It can resist the upper construction load, ensure the continuity of the vapor barrier layer, and support the upper insulation material to prevent the insulation material from breaking and deforming at the trough after being stepped on.

[0044] In this invention, the first vapor barrier layer of the self-adhesive vapor barrier is composed of multiple materials, which has excellent tear resistance and breakage resistance, and can reduce the damage rate of the self-adhesive vapor barrier. The second vapor barrier layer is an adhesive layer with strong self-adhesion and strong wrapping force for penetrating screws, forming a wrapping seal to block the entry of water vapor and improve the vapor barrier effect.

[0045] The design of the adhesive and anti-adhesive layers in the self-adhesive vapor barrier membrane of this invention ensures effective vapor barrier properties and ease of construction at joints and overlaps. This invention provides a better vapor barrier material for profiled steel roofing, which can improve the effectiveness and lifespan of the roof maintenance system.

[0046] In this invention, the amino groups in the aminosilane-modified inorganic layered compounds in the self-adhesive modified asphalt formulation can chemically adsorb onto the carboxyl groups on the fused-ring aromatic flakes in the asphalt, forming a stable dispersion system in the asphalt. This allows for nanoscale dispersion and layered arrangement in the modified asphalt, increasing the density between molecules and giving the self-adhesive modified asphalt excellent vapor barrier properties.

[0047] In this invention, a low molecular weight polyisobutylene succinate pentaerythritol is added to the self-adhesive modified asphalt formulation to improve the adhesion and wetting ability of the modified asphalt to the substrate. At the same time, it can reduce the viscosity of the system and increase the fluidity of the modified asphalt, making it easier to produce ultra-thin vapor barrier membranes with a thickness of less than 0.6 mm.

[0048] This invention provides a method for preparing self-adhesive modified asphalt. An inorganic layered compound modified with an aminosilane coupling agent is used as the first crosslinking agent. The amino functional groups on the crosslinking agent serve as reactive sites. On the one hand, it can react with the carboxylic acid in the asphalt, and on the other hand, it can react with the acid anhydride in the macromolecular polymer SEBS-g-MAH. Through chemical bonding, a stable three-dimensional network structure can be formed, thereby improving the high-temperature stability of the modified asphalt.

[0049] During the preparation of self-adhesive modified asphalt, the PS hard segments on both the SEBS-g-MAH macromolecular chain and the SBS macromolecular chain dissolve, and the crystalline regions of the PS segments on the two macromolecular chains aggregate together to form physical cross-linking regions, thereby improving the dispersion of SBS in asphalt and further enhancing the stability of the modified asphalt. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the vapor barrier membrane structure in this invention;

[0051] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0052] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0053] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0054] Figure 5 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0055] Figure 6 This is a structural schematic diagram of Embodiment 5 of the present invention.

[0056] In the diagram: 1. First vapor barrier layer; 11. Polypropylene film; 12. Metallic aluminum layer; 13. Polyethylene terephthalate; 14. Fiberglass mesh; 2. Second vapor barrier layer; 3. Anti-stick layer. Detailed Implementation

[0057] The embodiments of the present invention will be described in further detail below with reference to examples. These examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0058] 1. Preparation of self-adhesive modified asphalt

[0059] Using the self-adhesive modified asphalt preparation method, five groups of self-adhesive modified asphalt were prepared according to the components given in Table 1, as a backup for the preparation of vapor barrier membranes;

[0060] Table 1 Examples of self-adhesive modified asphalt preparation

[0061]

[0062]

[0063] 2. Preparation of vapor barrier membrane

[0064] Example 1: A self-adhesive vapor barrier membrane, wherein the first vapor barrier layer comprises a matte polypropylene film with a thickness of 0.02 mm, a metallic aluminum layer with a thickness of 0.007 mm, a polyethylene terephthalate layer with a thickness of 0.012 mm, and a fiberglass mesh fabric with a basis weight of 80 g / m². 2 The second vapor barrier is the self-adhesive modified asphalt prepared in Preparation Example 1; the anti-adhesive layer is a PE release film. After the layers of the first vapor barrier are prepared by adhesive bonding process, the second vapor barrier is hot-coated onto the first vapor barrier, and then the anti-adhesive layer is covered to obtain the self-adhesive modified vapor barrier film.

[0065] Example 2: A self-adhesive vapor barrier membrane, wherein the first vapor barrier layer comprises a matte polypropylene film with a thickness of 0.02 mm, a metallic aluminum layer with a thickness of 0.007 mm, a polyethylene terephthalate layer with a thickness of 0.012 mm, and a fiberglass mesh fabric with a basis weight of 80 g / m². 2 The second vapor barrier is the self-adhesive modified asphalt prepared in Preparation Example 2; the anti-adhesive layer is a PE release film. After the layers of the first vapor barrier are prepared by adhesive bonding process, the second vapor barrier is hot-coated onto the first vapor barrier, and then the anti-adhesive layer is covered to obtain the self-adhesive modified vapor barrier film.

[0066] Example 3: A self-adhesive vapor barrier membrane, wherein the first vapor barrier layer comprises a matte polypropylene film with a thickness of 0.02 mm, a metallic aluminum layer with a thickness of 0.007 mm, a polyethylene terephthalate layer with a thickness of 0.012 mm, and a fiberglass mesh fabric with a basis weight of 80 g / m². 2 The second vapor barrier is the self-adhesive modified asphalt prepared in Preparation Example 3; the anti-adhesive layer is a PE release film. After the layers of the first vapor barrier are prepared by adhesive bonding process, the second vapor barrier is hot-coated onto the first vapor barrier, and then the anti-adhesive layer is covered to obtain the self-adhesive modified vapor barrier film.

[0067] Example 4: A self-adhesive vapor barrier membrane, wherein the first vapor barrier layer comprises four layers of laminated polypropylene film with a thickness of 0.25 mm and fiberglass mesh with a basis weight of 100 g / m². 2The second vapor barrier is the self-adhesive modified asphalt prepared in Preparation Example 4; the anti-adhesive layer is a PE release film. After the layers of the first vapor barrier are prepared by adhesive bonding process, the second vapor barrier is hot-coated onto the first vapor barrier, and then the anti-adhesive layer is covered to obtain the self-adhesive modified vapor barrier film.

[0068] Example 5: A self-adhesive vapor barrier membrane, wherein the first vapor barrier layer comprises four layers of laminated polypropylene film with a thickness of 0.25 mm and fiberglass mesh with a basis weight of 100 g / m². 2 The second vapor barrier is the self-adhesive modified asphalt prepared in Preparation Example 5; the anti-adhesive layer is a PE release film. After the layers of the first vapor barrier are prepared by adhesive bonding process, the second vapor barrier is hot-coated onto the first vapor barrier, and then the anti-adhesive layer is covered to obtain the self-adhesive modified vapor barrier film.

[0069] Comparative Example 1: A vapor barrier membrane comprising a polyethylene film with a thickness of 0.3 mm.

[0070] Performance testing:

[0071] (1) The water vapor transmission rate was determined in accordance with GB / T 17146-2015 "Test Method for Water Vapor Transmission Performance of Building Materials and Their Products".

[0072] (2) Peel strength and nail tear strength were determined in accordance with GB 23441-2009 "Self-adhesive polymer modified bitumen waterproof membrane".

[0073] (3) Tensile strength was determined in accordance with GB 23441-2009 "Self-adhesive polymer modified bitumen waterproof membrane".

[0074] (4) The softening point shall be determined in accordance with GB / T 4507-2014 Asphalt Softening Point Test Method (Ring and Ball Method).

[0075] Table 2 Examples of self-adhesive modified vapor barrier membranes

[0076]

[0077] Comparison of the test data from Examples 1-5 and Comparative Example 1 shows that the vapor barrier membrane prepared by the present invention has low water vapor permeability and good vapor barrier performance. Furthermore, the vapor barrier membrane of the present invention has a self-adhesive modified asphalt layer, which adheres firmly to the base layer, has high peel strength, is not easy to fall off, and has high temperature resistance. At the same time, its tested nail tear strength and tensile strength are high, and the vapor barrier membrane has strong tensile strength and deformation resistance, which can resist the upper construction load and ensure the continuity of the vapor barrier layer. It can also support the upper insulation material and prevent the insulation material from breaking and deforming at the trough after being stepped on.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-adhesive vapor barrier membrane, characterized in that, It includes a first vapor barrier layer and a second vapor barrier layer. The first vapor barrier layer is a multi-layer composite film used to prevent itself from tearing and breaking. The second vapor barrier layer is an adhesive layer coated on the first vapor barrier layer to form a wrapping and sealing effect on the penetrating object. The multilayer composite film includes one or more resin layers; the adhesive layer is made of self-adhesive modified asphalt; An anti-sticking layer is provided on the other side of the second vapor barrier layer. The anti-sticking layer is a release film or release paper. The self-adhesive modified asphalt comprises the following components by weight: 50-65 parts asphalt, 2-10 parts SIS, 5-15 parts SBS, 2-6 parts tackifying resin, 1-10 parts compatibilizer, 4-15 parts softener, 1-6 parts wetting and tackifying agent, 4-10 parts first crosslinking agent, 2-8 parts second crosslinking agent, and 5-20 parts filler. The first crosslinking agent is an inorganic layered compound modified with an aminosilane coupling agent. The second crosslinking agent is SEBS-g-MAH. The method for preparing the self-adhesive modified asphalt includes the following steps: (1) The second crosslinking agent SEBS-g-MAH was added to 2 / 3 of the softener for pre-swelling for 8 hours to obtain a pre-swelling solution; (2) Heat the asphalt to 160°C, add compatibilizer and 1 / 3 softener, then raise the temperature to 180°C and stir evenly to obtain a mixed solution. (3) Control the temperature of the mixed solution to 180-190℃, add SBS and SIS in sequence, stir evenly, and after SBS and SIS have completely swollen and dissolved, add the pre-swollen solution and stir evenly. (4) Control the temperature of the mixed solution obtained in step (3) to 150-160℃, continue to add the first crosslinking agent, stir evenly, then add the wetting and tackifying agent and tackifying resin, stir evenly, and finally add the filler and stir evenly to obtain self-adhesive modified asphalt.

2. The self-adhesive vapor barrier membrane according to claim 1, characterized in that, The resin layer is a thermoplastic resin, including one of polyolefin, polyester, polyamide, EVOH, and PVDC.

3. The self-adhesive vapor barrier membrane according to claim 2, characterized in that, The multilayer composite membrane further includes one or both of a metal layer and a mesh fabric layer; The metal layer is either aluminum foil or copper foil; The mesh fabric layer is either polyester mesh fabric or glass fiber mesh fabric.

4. The self-adhesive vapor barrier membrane according to claim 3, characterized in that, The mesh fabric has a basis weight of 30-200 g / m². 2 The mesh size is 2mm*2mm to 8mm*8mm.

5. The self-adhesive vapor barrier membrane according to claim 1, characterized in that, The asphalt is one or both of No. 90 asphalt and No. 70 asphalt; The SIS is one or both of star SIS and linear SIS; The SBS is one or both of star SBS and linear SBS; The tackifying resin is one or more of petroleum resin, rosin resin, terpene resin, and coumarone resin; The compatibilizer is an aromatic oil; The softener is one or both of the following: reduced-pressure three-line oil and reduced-pressure two-line oil; The wetting and tackifying agent is pentaerythritol polyisobutylene succinate; The filler is one or more of the following: light calcium carbonate, heavy calcium carbonate, talc, and kaolin. The inorganic layered compound modified by the aminosilane coupling agent is one or more of talc, mica, montmorillonite, and hydrotalcite.

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