Environment-friendly self-adhesive waterproof coiled material and preparation method thereof

Abstract

The application provides an environment-friendly self-adhesive waterproof coiled material and a preparation method thereof. The environment-friendly self-adhesive waterproof coiled material is provided with a PET film, an activated environment-friendly self-adhesive glue layer, an environment-friendly self-adhesive glue layer and a release film from top to bottom, so that a chemical bond (a C-C bond, a C-O bond and the like) is formed between the self-adhesive glue and the PET film, thereby avoiding the separation of the self-adhesive glue and the PET film in a low-temperature environment.

Description

Technical Field

[0001] This invention relates to the technical field of self-adhesive waterproof membranes, specifically to an environmentally friendly self-adhesive waterproof membrane and its preparation method. Background Technology

[0002] Since the 1990s, self-adhesive waterproof membranes, as a new type of building waterproofing material, have been rapidly promoted and applied in my country's civil and industrial buildings, subway tunnels, bridge deck waterproofing and other fields due to their outstanding advantages such as pressure sensitivity, self-healing, waterproofing, convenient construction, and environmental safety.

[0003] Typically, self-adhesive waterproof membranes include bituminous self-adhesive waterproof membranes and non-bituminous polymer self-adhesive waterproof membranes.

[0004] Asphalt-based self-adhesive waterproof membranes are a type of high-strength self-adhesive waterproof membrane made by using self-adhesive modified asphalt as the adhesive layer, PET film as the reinforcing material (located on the surface or in the middle of the membrane), and a release liner. However, a problem exists: the asphalt content in the adhesive layer makes the production and application processes environmentally unfriendly. With increasingly stringent environmental requirements, many local housing and construction departments have issued documents requiring the use of environmentally friendly materials such as water-based building coatings and polymer waterproofing materials. Furthermore, ordinary PET film has poor adhesion to modified asphalt, and in low-temperature environments (below 0°C), the PET film easily separates from the modified asphalt.

[0005] Non-bitumen-based polymer self-adhesive waterproof membrane is a type of waterproof membrane that can be pre-laid onto post-cast concrete structures to form a strong reverse bond. This membrane uses resin-based polymer sheets (EVA, LDPE, HDPE, ECB, etc.) as a base material, with a non-bitumen-based polymer self-adhesive coating applied to the polymer waterproof substrate. After the self-adhesive layer of the membrane reacts and solidifies with the liquid concrete slurry, it forms a seamless bond between the waterproof layer and the concrete structure, eliminating the risk of water seepage between layers and effectively improving the reliability of the waterproofing system.

[0006] Non-asphalt-based polymer self-adhesive waterproof membranes do not contain asphalt, rubber oil, or other polymer self-adhesive materials with irritating odors. The manufacturing temperature does not exceed 150℃, resulting in low energy consumption and no generation of irritating gases. This makes the production and application more environmentally friendly, thus giving the product greater market competitiveness.

[0007] CN105295829A discloses an environmentally friendly high-strength waterproof membrane self-adhesive, which, by weight, comprises 10-30 parts of styrene-butadiene-styrene thermoplastic elastomer, 30-50 parts of chlorinated paraffin, 30-50 parts of tackifying resin, and 0.1-1 parts of antioxidant; the tackifying resin includes C5 resin, terpene resin, and rosin resin, and by weight percentage, rosin resin is 10-30%, terpene resin is 30-60%, and C5 resin is 30-60%, totaling 100%; the mass ratio of styrene to butadiene in the styrene-butadiene-styrene thermoplastic elastomer is 30 / 70. The adhesion between the self-adhesive and the PET film in this technology mainly relies on the hydrogen bonding or dipole moment forces formed between the polar groups in the polymer self-adhesive material, such as carboxyl and hydroxyl groups, and the interface of the resin polymer film in the vertical direction. It is not easy to stabilize and has low strength in low temperature environment, which makes the self-adhesive layer of the self-adhesive waterproof membrane easy to separate from the PET film in low temperature environment (-5℃).

[0008] To improve the stability and durability of non-asphalt polymer self-adhesive waterproof membranes, developing a high-strength, environmentally friendly self-adhesive waterproof membrane is an urgent problem to be solved. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides an environmentally friendly self-adhesive waterproof membrane. This environmentally friendly self-adhesive waterproof membrane, by setting an environmentally friendly self-adhesive layer, activating the environmentally friendly self-adhesive layer, and activating the PET film, forms chemical bonds (CC bonds, CO bonds, etc.) between the self-adhesive material and the PET film, thereby preventing the self-adhesive material from separating from the PET film in low-temperature environments.

[0010] The technical solution of the present invention is as follows:

[0011] This invention provides an environmentally friendly self-adhesive waterproof membrane, which consists of a PET film, an activated environmentally friendly self-adhesive layer, an environmentally friendly self-adhesive layer, and a release film, arranged from top to bottom.

[0012] Furthermore, the environmentally friendly self-adhesive waterproof membrane is provided from top to bottom with a release film, an environmentally friendly self-adhesive layer, an activated environmentally friendly self-adhesive layer, a PET film, an activated environmentally friendly self-adhesive layer, an environmentally friendly self-adhesive layer, and a release film.

[0013] Furthermore, the environmentally friendly self-adhesive layer comprises the following raw materials by weight percentage:

[0014] Low-temperature plasticizer 10wt%-20wt%;

[0015] Thermoplastic elastic modifier 5wt%-20wt%;

[0016] Softener 20wt%-40wt%;

[0017] Tackifier 15wt%-30wt%;

[0018] Pigment 0.1wt%-1wt%;

[0019] Heat-resistant additives 1wt%-3wt%; and

[0020] Filler 10wt%-25wt%.

[0021] Furthermore, the low-temperature plasticizer is composed of 50% to 60% by weight of rosin acid and 30% to 40% by weight of fatty acid.

[0022] Furthermore, the thermoplastic elastomer modifier is at least one of SBS, SBR, SSBR, SIS, etc.

[0023] Furthermore, the softener is at least one of naphthenic oil, aromatic oil, anti-corrosion oil, and environmentally friendly rubber oil with a pour point of -20 to -40°C.

[0024] Furthermore, the tackifier is at least one of petroleum C5 resin, petroleum C9 resin, terpene resin, and phenolic resin, which has no irritating odor.

[0025] Furthermore, the pigment is one of the following: color powder, color paste, etc.

[0026] Furthermore, the heat-resistant additive is at least one of polyethylene wax, polypropylene wax, and polypropylene.

[0027] Furthermore, the filler is at least one selected from calcium carbonate, talc, heavy calcium carbonate, light calcium carbonate, fumed silica, and black carbon black.

[0028] This invention provides a method for preparing the aforementioned environmentally friendly self-adhesive waterproof membrane, the method comprising the following steps:

[0029] Step 1: Prepare environmentally friendly self-adhesive material;

[0030] Step 2: Activate the environmentally friendly self-adhesive material;

[0031] Step 3: Irradiate the PET film with ultraviolet light to activate the surface of the PET film. At the same time, apply the activated environmentally friendly self-adhesive material to one or both sides of the activated PET film to form an activated environmentally friendly self-adhesive layer. Then, apply the unactivated environmentally friendly self-adhesive material to the other side of the PET film that is not coated with the activated environmentally friendly self-adhesive material to form an environmentally friendly self-adhesive layer.

[0032] Step 4: A release film is applied to the other side of the environmentally friendly self-adhesive layer that is not coated with the activated environmentally friendly self-adhesive layer. After cooling, it is rolled into an environmentally friendly self-adhesive waterproof membrane.

[0033] Furthermore, the preparation method of the environmentally friendly self-adhesive material includes the following steps:

[0034] Step T1-1: Add softener and thickener to the first reaction vessel, heat to 120-130℃, and stir until the thickener is completely dissolved;

[0035] Step T1-2: Add low-temperature plasticizer to the second reactor and control the temperature of the second reactor at 110-120℃. Then add thermoplastic elastic modifier and stir at 110-120℃ until the thermoplastic elastic modifier is completely swollen and free of particles.

[0036] Step T1-3: Pour the mixture in the first reactor into the second reactor, and slowly add the pigment and heat-resistant additive in sequence, stirring until evenly dispersed;

[0037] Step T1-4: Slowly add the packing material to the first reaction vessel, stir and disperse it evenly, and control the temperature at 140-150℃. The batching is complete.

[0038] Furthermore, in step 2, the free radical initiator is added to the rapidly stirred environmentally friendly self-adhesive material in one go, the temperature is controlled at 140-150℃, and the activated environmentally friendly self-adhesive material is obtained after rapid stirring for 20 minutes.

[0039] Furthermore, in step 2, the free radical initiator is one of the following: an organic peroxide initiator or an azo initiator.

[0040] Further, in step 2, the amount of the free radical initiator is 0.1% wt% to 0.5% wt% of the environmentally friendly self-adhesive material.

[0041] Furthermore, in step 3, the PET film surface is irradiated with ultraviolet light for 5 to 10 seconds to induce the generation of activated free radicals on the PET film surface.

[0042] The beneficial effects of this invention are as follows:

[0043] 1. The high-strength, environmentally friendly self-adhesive waterproof membrane of this invention uses environmentally friendly self-adhesive as the adhesive layer and PET film as the reinforcing material (located on the surface or in the middle of the membrane), with a release film covering the surface. This invention employs a chemical method to activate the self-adhesive material, giving its surface active free radicals, and a physical method to activate the PET film surface, generating active free radicals on its surface. The active free radicals on the activated self-adhesive material surface react with the active free radicals on the PET film surface, forming chemical bonds (CC bonds, CO bonds, etc.) at the interface between the self-adhesive layer and the PET film. These bonds are more stable and stronger than hydrogen bonding and dipole moment forces, ensuring that the self-adhesive layer does not separate from the PET film in low-temperature environments (-5℃).

[0044] 2. This invention solves the problem of separation between the membrane and the self-adhesive layer in conventional high-strength self-adhesive modified bitumen waterproof membranes under low-temperature conditions, and has better and more durable waterproof performance.

[0045] 3. The environmentally friendly self-adhesive waterproof membrane of the present invention meets the requirements of environmental protection policies, and the membrane will have a greater market potential in the future. Attached Figure Description

[0046] Figure 1 This is a structural schematic diagram of the environmentally friendly self-adhesive waterproof membrane of Example 1.

[0047] Figure 2 The diagram shows the structure of the environmentally friendly self-adhesive waterproof membrane in Examples 2 and 3.

[0048] The annotations in the attached figures are explained as follows:

[0049] 1-PET film;

[0050] 2-Activated environmentally friendly self-adhesive layer;

[0051] 3-Environmentally friendly self-adhesive layer;

[0052] 4-Separation membrane. Detailed Implementation

[0053] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0054] Example 1

[0055] like Figure 1 As shown, an environmentally friendly self-adhesive waterproof membrane is provided from top to bottom as follows: PET film 1, activated environmentally friendly self-adhesive layer 2, environmentally friendly self-adhesive layer 3, and release film 4.

[0056] The environmentally friendly self-adhesive layer 3 comprises the following raw materials by weight percentage: low-temperature plasticizer (composed of 50% rosin acid and 30% fatty acid): 15wt%, thermoplastic elastic modifier SBS: 6wt%, softener naphthenic oil (pour point -25℃): 20wt%, tackifier C5 petroleum resin: 15wt%, pigment paste: 0.1wt%, heat-resistant additive polyethylene wax: 1wt%, and filler (200-mesh stone powder): 15wt%.

[0057] Preparation method of environmentally friendly self-adhesive waterproof membrane:

[0058] Step 1: Prepare environmentally friendly self-adhesive material;

[0059] Step 2: Activate the environmentally friendly self-adhesive material. Use benzoyl peroxide to activate the self-adhesive material at a dosage of 0.1 wt% and a temperature of 140℃.

[0060] Step 3: Irradiate the PET film with ultraviolet light for 5 seconds to activate the surface of the PET film 1. At the same time, apply the activated environmentally friendly self-adhesive material to one side of the activated PET film 1 to form the activated environmentally friendly self-adhesive layer 2. Then, apply the unactivated environmentally friendly self-adhesive material to the other side of the activated environmentally friendly self-adhesive PET film 1 to form the environmentally friendly self-adhesive layer 3.

[0061] Step 4: On the other side of the environmentally friendly self-adhesive layer 3, which is not coated with the activated environmentally friendly self-adhesive layer 2, a release film 4 is applied. After cooling, it is rolled into an environmentally friendly self-adhesive waterproof membrane.

[0062] Example 2

[0063] like Figure 2 As shown, an environmentally friendly self-adhesive waterproof membrane is provided from top to bottom as follows: release film 4, environmentally friendly self-adhesive layer 3, activated environmentally friendly self-adhesive layer 2, PET film 1, activated environmentally friendly self-adhesive layer 2, environmentally friendly self-adhesive layer 3, and release film 4.

[0064] The environmentally friendly self-adhesive layer 3 comprises the following raw materials by weight percentage: low-temperature plasticizer (composed of 50% rosin acid and 30% fatty acid): 15wt%, thermoplastic elastic modifier SBS: 10wt%, softener naphthenic oil (pour point -20℃): 25wt%, tackifier C5 petroleum resin: 20wt%, pigment paste: 0.2wt%, heat-resistant additive polyethylene wax: 1.5wt%, and filler (200-mesh heavy calcium carbonate): 20wt%.

[0065] Preparation method of environmentally friendly self-adhesive waterproof membrane:

[0066] Step 1: Prepare environmentally friendly self-adhesive material;

[0067] Step 2: Activate the environmentally friendly self-adhesive material. Use benzoyl peroxide to activate the self-adhesive material at a dosage of 0.15 wt% and a temperature of 145℃.

[0068] Step 3: Irradiate the PET film with ultraviolet light for 8 seconds to activate the surface of the PET film 1. At the same time, apply the activated environmentally friendly self-adhesive material to one and both sides of the activated PET film 1 to form an activated environmentally friendly self-adhesive layer 2. Then, apply the unactivated environmentally friendly self-adhesive material to the other side of the activated environmentally friendly self-adhesive PET film 1 to form an environmentally friendly self-adhesive layer 3.

[0069] Step 4: On the other side of the environmentally friendly self-adhesive layer 3, which is not coated with the activated environmentally friendly self-adhesive layer 2, a release film 4 is applied. After cooling, it is rolled into an environmentally friendly self-adhesive waterproof membrane.

[0070] Example 3

[0071] like Figure 2 As shown, an environmentally friendly self-adhesive waterproof membrane is provided from top to bottom as follows: release film 4, environmentally friendly self-adhesive layer 3, activated environmentally friendly self-adhesive layer 2, PET film 1, activated environmentally friendly self-adhesive layer 2, environmentally friendly self-adhesive layer 3, and release film 4.

[0072] The environmentally friendly self-adhesive layer 3 comprises the following raw materials by weight percentage: low-temperature plasticizer (composed of 50% rosin acid and 30% fatty acid): 20wt%, thermoplastic elastic modifier SBS: 15wt%, softener naphthenic oil (pour point -30℃): 30wt%, tackifier C5 petroleum resin: 30wt%, pigment paste: 0.5wt%, heat-resistant additive polyethylene wax: 2wt%, and filler (200-mesh stone powder): 25wt%.

[0073] Preparation method of environmentally friendly self-adhesive waterproof membrane:

[0074] Step 1: Prepare environmentally friendly self-adhesive material;

[0075] Step 2: Activate the environmentally friendly self-adhesive material. Use benzoyl peroxide to activate the self-adhesive material at a dosage of 0.3 wt% and a temperature of 150℃.

[0076] Step 3: Irradiate the PET film with ultraviolet light for 10 seconds to activate the surface of the PET film 1. At the same time, apply the activated environmentally friendly self-adhesive material to one and both sides of the activated PET film 1 to form an activated environmentally friendly self-adhesive layer 2. Then, apply the unactivated environmentally friendly self-adhesive material to the other side of the activated environmentally friendly self-adhesive PET film 1 to form an environmentally friendly self-adhesive layer 3.

[0077] Step 4: On the other side of the environmentally friendly self-adhesive layer 3, which is not coated with the activated environmentally friendly self-adhesive layer 2, a release film 4 is applied. After cooling, it is rolled into an environmentally friendly self-adhesive waterproof membrane.

[0078] Comparative Example

[0079] The standard high-strength self-adhesive modified bitumen waterproof membrane uses self-adhesive modified bitumen as the self-adhesive material and a standard unactivated PET reinforcing film.

[0080] The adhesion between the self-adhesive and the PET film of the waterproof membranes of Examples 1-3 and the comparative examples of the present invention was observed under low temperature and high temperature conditions. The experimental results are summarized in Table 1.

[0081] Table 1. Test results at low and high temperatures for Examples 1-3 and the comparative examples.

[0082]

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. An environmentally friendly self-adhesive waterproof membrane, characterized in that, The environmentally friendly self-adhesive waterproof membrane is configured from top to bottom as follows: PET film, activated environmentally friendly self-adhesive layer, environmentally friendly self-adhesive layer, and release film; or, the environmentally friendly self-adhesive waterproof membrane is configured from top to bottom as follows: release film, environmentally friendly self-adhesive layer, activated environmentally friendly self-adhesive layer, PET film, activated environmentally friendly self-adhesive layer, environmentally friendly self-adhesive layer, and release film. The environmentally friendly self-adhesive layer comprises the following raw materials by weight percentage: Low-temperature plasticizer 10wt%-20wt%; Thermoplastic elastic modifier 5wt%-20wt%; Softener 20wt%-40wt%; Tackifier 15wt%-30wt%; Pigment 0.1wt%-1wt%; Heat-resistant additives 1wt%-3wt%; and Filler 10wt%-25wt%; The thermoplastic elastic modifier is at least one of SBS, SBR, SSBR, and SIS; The preparation method of the environmentally friendly self-adhesive waterproof membrane includes the following steps: Step 1: Prepare environmentally friendly self-adhesive material; Step 2: Activate the environmentally friendly self-adhesive material; The activated environmentally friendly self-adhesive compound is obtained by adding a free radical initiator to rapidly stirred environmentally friendly self-adhesive compound at a temperature controlled at 140~150℃ for 20 minutes; the amount of the free radical initiator is 0.1%wt%~0.5%wt% of the environmentally friendly self-adhesive compound. Step 3: Irradiate the PET film with ultraviolet light to activate the surface of the PET film. At the same time, apply the activated environmentally friendly self-adhesive material to one or both sides of the activated PET film to form an activated environmentally friendly self-adhesive layer. Then, apply the unactivated environmentally friendly self-adhesive material to one side of the activated environmentally friendly self-adhesive layer. The side of the activated environmentally friendly self-adhesive layer is the other side of the uncoated PET film, forming an environmentally friendly self-adhesive layer. Step 4: A release film is applied to the other side of the environmentally friendly self-adhesive layer that is not coated with the activated environmentally friendly self-adhesive layer. After cooling, it is rolled into an environmentally friendly self-adhesive waterproof membrane.

2. The environmentally friendly self-adhesive waterproof membrane according to claim 1, characterized in that, The low-temperature plasticizer consists of 50% to 60% by weight of rosin acid and 30% to 40% by weight of fatty acids.

3. The environmentally friendly self-adhesive waterproof membrane according to claim 2, characterized in that, The softener is at least one of naphthenic oil, aromatic oil, anti-corrosion oil, and environmentally friendly rubber oil with a pour point of -20 to -40°C.

4. The environmentally friendly self-adhesive waterproof membrane according to claim 2, characterized in that, The tackifier is at least one of petroleum C5 resin, petroleum C9 resin, terpene resin, and phenolic resin, which are free of irritating odor.

5. The environmentally friendly self-adhesive waterproof membrane according to claim 2, characterized in that, The pigment is either a color powder or a color paste.

6. The environmentally friendly self-adhesive waterproof membrane according to claim 2, characterized in that, The heat-resistant additive is at least one of polyethylene wax, polypropylene wax, and polypropylene.

7. The environmentally friendly self-adhesive waterproof membrane according to claim 2, characterized in that, The filler is at least one of calcium carbonate, talc, silica, and black carbon.

8. The environmentally friendly self-adhesive waterproof membrane according to claim 7, characterized in that, The calcium carbonate is at least one of heavy calcium carbonate and light calcium carbonate.

9. A method for preparing an environmentally friendly self-adhesive waterproof membrane according to any one of claims 1-8, characterized in that, The preparation method includes the following steps: Step 1: Prepare environmentally friendly self-adhesive material; Step 2: Activate the environmentally friendly self-adhesive material; The activated environmentally friendly self-adhesive compound is obtained by adding a free radical initiator to rapidly stirred environmentally friendly self-adhesive compound at a temperature controlled at 140~150℃ for 20 minutes; the amount of the free radical initiator is 0.1%wt%~0.5%wt% of the environmentally friendly self-adhesive compound. Step 3: Irradiate the PET film with ultraviolet light to activate the surface of the PET film. At the same time, apply the activated environmentally friendly self-adhesive material to one or both sides of the activated PET film to form an activated environmentally friendly self-adhesive layer. Then, apply the unactivated environmentally friendly self-adhesive material to one side of the activated environmentally friendly self-adhesive layer. The side of the activated environmentally friendly self-adhesive layer is the other side of the uncoated PET film, forming an environmentally friendly self-adhesive layer. Step 4: A release film is applied to the other side of the environmentally friendly self-adhesive layer that is not coated with the activated environmentally friendly self-adhesive layer. After cooling, it is rolled into an environmentally friendly self-adhesive waterproof membrane.

10. The preparation method according to claim 9, characterized in that, The preparation method of the environmentally friendly self-adhesive material includes the following steps: Step T1-1: Add softener and thickener to the first reaction vessel, heat to 120~130℃, and stir until the thickener is completely dissolved; Step T1-2: Add low-temperature plasticizer to the second reactor and control the temperature of the second reactor at 110~120℃. Then add thermoplastic elastic modifier and stir at 110~120℃ until the thermoplastic elastic modifier is completely swollen and free of particles. Step T1-3: Pour the mixture in the first reactor into the second reactor, and slowly add the pigment and heat-resistant additive in sequence, stirring until evenly dispersed; Step T1-4: Slowly add the packing material to the first reaction vessel, stir and disperse it evenly, and control the temperature at 140~150℃. The batching is complete.

11. The preparation method according to claim 10, characterized in that, In step 2, the free radical initiator is one of the following: an organic peroxide initiator or an azo initiator.

12. The preparation method according to claim 11, characterized in that, In step 3, the PET film surface is irradiated with ultraviolet light for 5 to 10 seconds to induce the generation of activated free radicals on the PET film surface.

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