A coating for the separating layer of a modified asphalt waterproofing membrane, a preparation method and application thereof, and a composite waterproofing membrane and a preparation method thereof

Abstract

This invention discloses a coating for the isolation layer of modified bitumen waterproof membrane, its preparation method, and its application, as well as a composite waterproof membrane and its preparation method. The raw materials for preparing the coating include: emulsified bitumen, water, emulsion, anti-sticking agent, pH adjuster, defoamer, stabilizer, curing agent, titanium dioxide, and filler. This invention replaces traditional isolation materials by preparing an anti-sticking coating on the surface of the modified bitumen layer. This coating can completely adhere to the modified bitumen coating and can also be used in combination with polymer coatings and polyurethane coatings. Furthermore, the isolation layer coating of this invention also has excellent low-temperature performance.

Description

Technical Field

[0001] This invention belongs to the field of waterproof membrane technology, and more specifically, relates to a coating for the isolation layer of a modified bitumen waterproof membrane, its preparation method and application, as well as a composite waterproof membrane and its preparation method. Background Technology

[0002] To improve the functionality and lifespan of buildings and municipal engineering projects, the Ministry of Housing and Urban-Rural Development issued the mandatory engineering construction standard, "General Standard for Waterproofing of Buildings and Municipal Engineering." This standard sets a bottom-line control requirement to ensure the safety of people's lives and property, engineering safety, and the ecological environment, while promoting energy and resource conservation and meeting economic and social management needs. The general standard imposes stricter requirements on the waterproofing levels of main structures, roofs, and underground structures. Level 1 and 2 waterproofing require multiple layers of waterproofing to protect the building, and at least one layer of waterproof membrane is necessary. This means that the composite system of waterproof coatings and waterproof membranes will become the mainstream in the waterproofing market.

[0003] Modified bitumen waterproof membranes are currently the most commonly used waterproofing materials in the construction industry, and their waterproofing effect is widely recognized. However, the upper and lower surface films or self-adhesive layers of modified bitumen waterproof membranes generally only bond well with bitumen-based coating systems, and have poor bonding with polymer coatings, polyurethane coatings, and other systems, severely limiting their application in waterproof coating-waterproof membrane construction systems. Furthermore, the surface isolation materials of modified bitumen waterproof membranes also have drawbacks such as being prone to cracking at low temperatures. Summary of the Invention

[0004] The purpose of this invention is to provide a coating for the isolation layer of modified bitumen waterproof membrane, its preparation method and application, as well as a composite waterproof membrane and its preparation method. This invention replaces traditional isolation materials by preparing an anti-stick coating on the surface of the modified bitumen layer. The coating can not only completely adhere to the modified bitumen coating, but also can be used in combination with polymer coatings and polyurethane coatings. Furthermore, the isolation layer coating of this invention also has good low-temperature performance.

[0005] To achieve the above objectives, one aspect of the present invention provides a coating for the isolation layer of a modified bitumen waterproof membrane, wherein the raw materials for preparing the coating include: emulsified bitumen, water, emulsion, anti-sticking agent, pH adjuster, defoamer, stabilizer, curing agent, titanium dioxide, and filler.

[0006] According to the present invention, preferably, the raw materials for preparing the coating, by weight, include: 10-20 parts emulsified asphalt, 10-20 parts water, 55-65 parts emulsion, 5-8 parts anti-sticking agent, 1-2 parts pH adjuster, 0.5-1 part defoamer, 0.5-1 part stabilizer, 2-4 parts curing agent, 3-5 parts titanium dioxide, and 10-15 parts filler.

[0007] In this invention, the coating for the isolation layer can wet the modified asphalt surface to avoid coating shrinkage and agglomeration; the surface energy of the coating for the isolation layer of this invention needs to be less than 150 N / m to prevent the surface of the coating from becoming sticky after film formation and losing its anti-sticking and isolation function.

[0008] According to the present invention, preferably, the emulsified asphalt is anionic emulsified asphalt.

[0009] In this invention, the main function of emulsified asphalt is to enhance the bonding performance between the coating and the modified asphalt roll coating material, while also providing the coating with mechanical strength and adhesion to the substrate.

[0010] According to the present invention, preferably, the emulsion is a modified polypropylene wax emulsion.

[0011] In this invention, the modified polypropylene wax emulsion has a small emulsion particle size, can be mixed with various systems, has a good modification effect, and the coating made by adding it has good gloss and wear resistance.

[0012] According to the present invention, preferably, the anti-sticking agent is at least one selected from polytetrafluoroethylene, vinylidene fluoride and FEVE resin;

[0013] The curing agent is preferably an acrylic silicone resin curing agent.

[0014] In this invention, the main function of the anti-sticking agent is to reduce the surface energy of the coating and enhance the anti-sticking effect.

[0015] In this invention, the main function of the curing agent is to accelerate the curing of the coating under ultraviolet light.

[0016] According to the present invention, preferably, the pH adjuster is 2-amino-2-methyl-1-propanol;

[0017] The defoamer is hydroxyethyl cellulose;

[0018] The stabilizer is hydroxyethyl cellulose ether;

[0019] The titanium dioxide is adamantine red type titanium dioxide;

[0020] The filler is at least one of heavy calcium carbonate, light calcium carbonate, talc, and stone powder.

[0021] In this invention, preferably, the titanium dioxide has an average particle size of 50 nm.

[0022] In this invention, preferably, the filler has a mesh size of 500.

[0023] In this invention, in addition to the aforementioned 2-amino-2-methyl-1-propanol, other pH adjusters commonly used in the art can also be used; the main function of the pH adjuster is to regulate the pH and enhance the stability of the emulsified asphalt system. In addition to the aforementioned hydroxyethyl cellulose defoamer, other defoamers commonly used in the art can also be used; the main function of the defoamer is to defoam, preventing uneven coating and voids on the emulsion surface during the coating production stage. In addition to the aforementioned hydroxyethyl cellulose ether, other stabilizers commonly used in the art can also be used; the main function of the stabilizer is to enhance the stability of the system, thereby preventing the emulsion from separating and stratifying in the emulsion pool.

[0024] In this invention, titanium dioxide can play a protective role, enhance the mechanical strength and adhesion of the paint film, prevent cracks, prevent ultraviolet rays and moisture from penetrating, and extend the life of the paint film.

[0025] The coating for the isolation layer of the modified bitumen waterproof membrane of this invention forms a film with extremely fast speed and can be directly applied to the production line of ordinary modified bitumen membranes.

[0026] A second aspect of the present invention provides a method for preparing the above-mentioned coating, the method comprising:

[0027] (1) Mix the emulsion, pH adjuster, water and anti-sticking agent evenly to obtain the first component;

[0028] (2) The filler and titanium dioxide are mixed evenly to obtain the second component;

[0029] (3) The first component, the second component, and the emulsified asphalt are mixed evenly to obtain the third component;

[0030] (4) Mix the third component, the stabilizer and the defoamer evenly to obtain the fourth component;

[0031] (5) Mix the fourth component and the curing agent evenly to obtain the coating for the isolation layer of the modified bitumen waterproof membrane.

[0032] In the present invention, in the above-mentioned method for preparing the coating, preferably, in step (1), the mixing condition is to stir at 500-800 r / min for 15-20 min; in step (3), the mixing condition is to stir at 500-800 r / min for 20-40 min; in step (4), the mixing condition is to stir at 800-1000 r / min for 20-40 min; and in step (5), the mixing condition is to stir at 500-800 r / min for 20-40 min.

[0033] A third aspect of the present invention provides the application of the above-described coating in the preparation of the release layer of modified bitumen waterproof membrane.

[0034] A fourth aspect of the present invention provides a composite waterproof membrane, which comprises, in sequence: a first isolation layer, a first modified bitumen waterproof layer, a reinforcing layer, a second modified bitumen waterproof layer, and a second isolation layer.

[0035] At least one of the first and second isolation layers is made of the aforementioned coating material;

[0036] Preferably, when only one of the first and second isolation layers is made of the aforementioned coating material, the other isolation layer is made of PE film, fine sand, or mineral granules.

[0037] In this invention, preferably, the composite waterproof membrane comprises, from top to bottom: a first isolation layer, a first modified bitumen waterproof layer, a reinforcing layer, a second modified bitumen waterproof layer, and a second isolation layer.

[0038] In this invention, the materials of the first modified bitumen waterproof layer and the second modified bitumen waterproof layer are any commonly used modified bitumen in the field that can meet the performance requirements of modified bitumen waterproof membranes in accordance with national standards. For example, this invention can select hot-melt modified bitumen prepared by adding a certain proportion of SBS and other additives to base bitumen as raw material.

[0039] In this invention, the reinforcing layer only needs to meet national standards, for example, 250 g / cm³ can be selected. 2 Polyester base material.

[0040] A fourth aspect of the present invention provides a method for preparing the above-mentioned composite waterproof membrane, the method comprising:

[0041] (1) The dried and pre-impregnated reinforcing layer is immersed in a hot-melt modified asphalt bath to form a modified asphalt waterproof layer on the upper and lower surfaces of the reinforcing layer, and then the thickness is fixed to obtain a semi-finished product.

[0042] (2) The above coating is sprayed onto at least one side of the modified bitumen waterproof layer of the semi-finished product;

[0043] (3) When the semi-finished product obtained in step (2) is coated on both sides, the semi-finished product obtained in step (2) is subjected to water cooling treatment in sequence, and the coating is subjected to ultraviolet curing treatment and water cooling treatment at the same time as water cooling treatment to obtain the composite waterproof membrane.

[0044] When the semi-finished product obtained in step (2) is coated only on one side of the modified bitumen waterproof layer, the semi-finished product obtained in step (2) is subjected to water-cooling treatment only, UV curing treatment of the sprayed coating at the same time as water-cooling treatment, and water-cooling treatment only; then a film or sand is applied to the modified bitumen waterproof layer on the other side, and finally a cooling treatment is performed to obtain the composite waterproof membrane.

[0045] In the present invention, in the preparation method of the above-mentioned composite waterproof membrane, in step (2), preferably, the surface temperature of the semi-finished product is 170-180℃ during spraying; the coating thickness can be customized according to different product application requirements, and it is recommended to control it within 0.1 mm if there are no special application requirements.

[0046] In step (3), traditional roll material production involves water cooling via a 5-15 meter waterbed or other cooling equipment. This invention adds a UV irradiation device above and below the middle section of the cooling waterbed (where the roll material temperature is generally maintained at 100-130℃, meeting the thermal energy requirements for UV curing) to meet the needs of UV curing. The semi-finished product, coated with the paint, is then passed directly through the cooling waterbed with added UV irradiation equipment according to the normal production process. If both sides are coated, the roll material can be directly passed through the cooling device and then wound up. If only one side is coated, after passing through the cooling device, the other side is coated with a film or sandpaper, then cooled, and finally wound up.

[0047] The technical solution of the present invention has the following beneficial effects:

[0048] (1) The present invention replaces the traditional isolation material by preparing an anti-stick coating on the surface of the modified asphalt layer. The coating can not only be completely bonded to the modified asphalt coating, but also can be used in combination with polymer coatings and polyurethane coatings. Furthermore, the coating of the isolation layer of the present invention also has good low-temperature performance.

[0049] (2) The coating of the isolation layer of the modified bitumen waterproof membrane of the present invention has excellent anti-sticking performance, excellent isolation effect, and ensures that it does not stick under high temperature conditions, is easy to unroll and does not stick to the feet during construction; it has excellent low temperature performance and ensures that it does not crack under low temperature conditions.

[0050] (3) When the composite waterproof membrane and coating of the present invention are used together, they can be directly cold-bonded without the need for open flame hot-melt construction, which is safe, reliable and energy-efficient.

[0051] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0052] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0053] Figure 1 A schematic structural diagram of a composite waterproof membrane according to an embodiment of the present invention is shown.

[0054] Explanation of reference numerals in the attached figures:

[0055] 1. First isolation layer; 2. First modified bitumen waterproof layer; 3. Reinforcing layer; 4. Second modified bitumen waterproof layer; 5. Second isolation layer. Detailed Implementation

[0056] 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.

[0057] The present invention is further illustrated by the following examples:

[0058] In the following embodiments and comparative examples:

[0059] The emulsified asphalt used was anionic emulsified asphalt, purchased from Jingbo Petrochemical Company, grade 70#;

[0060] The emulsion used was a modified polypropylene wax emulsion, purchased from Keim-additec, brand name E-360;

[0061] The polytetrafluoroethylene used was purchased from DuPont, and its grade was PTFE NXT 70.

[0062] The FEVE resin used was HLR-1 from Shandong Huafu Chemical Co., Ltd.

[0063] The curing agent used was an acrylic silicone resin curing agent, purchased from Guangzhou Haoyi New Material Technology Co., Ltd., with the brand name WR-1948.

[0064] The pH adjuster used was 2-amino-2-methyl-1-propanol;

[0065] The defoaming agent used is hydroxyethyl cellulose;

[0066] The stabilizer used is hydroxyethyl cellulose ether;

[0067] The titanium dioxide used is adamantine red titanium dioxide with an average particle size of 50 nm;

[0068] The filler used is heavy calcium carbonate, with a specification of 500 mesh.

[0069] Example 1

[0070] (I) This embodiment provides a coating for the isolation layer of modified bitumen waterproof membrane. The raw materials for preparing the coating, by weight, include: 10 parts emulsified bitumen, 20 parts deionized water, 61 parts emulsion, 5 parts anti-sticking agent, 1 part pH adjuster, 1 part defoamer, 0.5 parts stabilizer, 4 parts curing agent, 3 parts titanium dioxide and 11 parts filler; wherein, the anti-sticking agent is FEVE resin.

[0071] The preparation method of the coating for the release layer of the above-mentioned modified bitumen waterproof membrane is as follows:

[0072] a. The emulsion, pH adjuster, water and anti-sticking agent are stirred at 600 r / min for 18 min to obtain the first component;

[0073] b. Mix the filler and titanium dioxide evenly to obtain the second component;

[0074] c. Mix the first component, the second component, and the emulsified asphalt at 600 r / min for 30 min to obtain the third component;

[0075] d. Add stabilizer and defoamer to the third component and stir at 900 r / min for 30 min to obtain the fourth component;

[0076] e. After adding the curing agent to the fourth component, stir at 600 r / min for 30 min to obtain the coating for the isolation layer of the modified bitumen waterproof membrane.

[0077] (ii) such as Figure 1 As shown, this embodiment provides a composite waterproof membrane, which sequentially includes: a first isolation layer 1, a first modified bitumen waterproof layer 2, a reinforcing layer 3, a second modified bitumen waterproof layer 4, and a second isolation layer 5.

[0078] The material of one of the first and second isolation layers is the coating for the isolation layer of the modified bitumen waterproof membrane prepared in this embodiment, and the material of the other isolation layer is a PE film.

[0079] The specific preparation method of the above-mentioned composite waterproof membrane is as follows:

[0080] (1) The dried and pre-impregnated reinforcing layer is immersed in a hot-melt modified asphalt bath to form a modified asphalt waterproof layer on the upper and lower surfaces of the reinforcing layer, and then the thickness is fixed to obtain a semi-finished product; wherein, the reinforcing layer has a thickness of 250 g / cm³. 2 Polyester base; by weight, the preimpregnated oil consists of 150 parts of 70# asphalt and 50 parts of constant-strength solid asphalt; by weight, the hot-melt modified asphalt consists of 50 parts of 70# asphalt, 10 parts of reduced-strength asphalt, 8 parts of SBS1332, 12 parts of 50-mesh tire rubber powder and 20 parts of 200-mesh talc powder.

[0081] (2) Spray the coating for the isolation layer of the modified bitumen waterproof membrane prepared in this embodiment onto the modified bitumen waterproof layer on one side of the semi-finished product; wherein, the surface temperature of the semi-finished product is 175°C and the coating thickness is 0.1 mm during spraying.

[0082] (3) The semi-finished product obtained in step (2) is subjected to water-cooling treatment only, UV curing treatment of the sprayed coating during water-cooling treatment, and water-cooling treatment only; then a PE film is applied to the modified asphalt waterproof layer on the other side, and finally water-cooling treatment is performed to obtain the composite waterproof membrane. The UV light intensity during UV curing treatment is 300 Mw / cm². 2 Specifically, in this stage of traditional roll material production, a 5-15 meter water bed is used. In this embodiment, an ultraviolet irradiation device is installed above and below the middle section of the cooling water bed (the temperature of the roll material in this section is generally maintained at 100-130℃, which can meet the thermal energy conditions for ultraviolet curing). The semi-finished product obtained in step (2) is directly passed through the cooling water bed with the added ultraviolet irradiation device according to the normal production process. Before the PE film is covered on the modified asphalt waterproof layer, when the semi-finished product obtained in step (2) passes through the cooling water bed, only the ultraviolet irradiation device on the side of the spray coating is turned on.

[0083] Example 2

[0084] (I) This embodiment provides a coating for the isolation layer of modified bitumen waterproof membrane. The raw materials for preparing the coating, by weight, include: 20 parts emulsified bitumen, 10 parts deionized water, 55 parts emulsion, 7 parts anti-sticking agent, 1 part pH adjuster, 0.5 parts defoamer, 1 part stabilizer, 3 parts curing agent, 5 parts titanium dioxide, and 15 parts filler; wherein the anti-sticking agent is FEVE resin.

[0085] The preparation method of the coating for the isolation layer of the modified bitumen waterproof membrane is the same as in Example 1.

[0086] (ii) such as Figure 1 As shown, the only difference between the composite waterproof membrane in this embodiment and that in embodiment 1 is that the material of the isolation layer, which is a coating, is the same as the coating used for the isolation layer of the modified bitumen waterproof membrane prepared in embodiment 2.

[0087] The only difference between the preparation method of the composite waterproof membrane in this embodiment and that in Example 1 is that the coating used for spraying is the same as the coating for the isolation layer of the modified bitumen waterproof membrane prepared in Example 2.

[0088] Example 3

[0089] (I) This embodiment provides a coating for the isolation layer of modified bitumen waterproof membrane. The raw materials for preparing the coating, by weight, include: 15 parts emulsified bitumen, 14 parts deionized water, 65 parts emulsion, 8 parts anti-sticking agent, 2 parts pH adjuster, 0.5 parts defoamer, 1 part stabilizer, 2 parts curing agent, 4 parts titanium dioxide, and 14 parts filler; wherein the anti-sticking agent is polytetrafluoroethylene.

[0090] The preparation method of the coating for the isolation layer of the modified bitumen waterproof membrane is the same as in Example 1.

[0091] (ii) such as Figure 1 As shown, the only difference between the composite waterproof membrane in this embodiment and that in embodiment 1 is that the material of the isolation layer, which is a coating, is the same as the coating used for the isolation layer of the modified bitumen waterproof membrane prepared in embodiment 3.

[0092] The only difference between the preparation method of the composite waterproof membrane in this embodiment and that in Example 1 is that the coating used for spraying is the coating for the isolation layer of the modified bitumen waterproof membrane prepared in Example 3.

[0093] Example 4

[0094] (I) This embodiment provides a coating for the isolation layer of modified bitumen waterproof membrane. The raw materials for preparing the coating, by weight, include: 17 parts emulsified bitumen, 17 parts deionized water, 65 parts emulsion, 6 parts anti-sticking agent, 2 parts pH adjuster, 0.5 parts defoamer, 0.5 parts stabilizer, 2 parts curing agent, 3 parts titanium dioxide, and 10 parts filler; wherein the anti-sticking agent is polytetrafluoroethylene.

[0095] The preparation method of the coating for the isolation layer of the modified bitumen waterproof membrane is the same as in Example 1.

[0096] (ii) such as Figure 1 As shown, the only difference between the composite waterproof membrane in this embodiment and that in embodiment 1 is that the material of the isolation layer, which is a coating, is the same as the coating used for the isolation layer of the modified bitumen waterproof membrane prepared in embodiment 4.

[0097] The only difference between the preparation method of the composite waterproof membrane in this embodiment and that in Example 1 is that the coating used for spraying is the coating for the isolation layer of the modified bitumen waterproof membrane prepared in Example 4.

[0098] Comparative Example 1

[0099] (a) This comparative example provides a coating for the isolation layer of a modified bitumen waterproof membrane. The raw materials for preparing the coating, by weight, include: 10 parts emulsified bitumen, 20 parts deionized water, 5 parts anti-sticking agent, 1 part pH adjuster, 1 part defoamer, 0.5 parts stabilizer, 4 parts curing agent, 3 parts titanium dioxide, and 11 parts filler; wherein the anti-sticking agent is FEVE resin.

[0100] The preparation method of the coating for the isolation layer of the modified bitumen waterproof membrane differs from that in Example 1 only in that no emulsion is added.

[0101] (ii) The only difference between the composite waterproof membrane in this comparative example and Example 1 is that the material of the isolation layer, which is a coating, is the same as the coating used for the isolation layer of the modified bitumen waterproof membrane prepared in Comparative Example 1.

[0102] The only difference between the preparation method of the composite waterproof membrane in this comparative example and that in Example 1 is that the coating used for spraying is the same as the coating used for the isolation layer of the modified bitumen waterproof membrane prepared in Comparative Example 1.

[0103] Comparative Example 2

[0104] (a) This comparative example provides a coating for the isolation layer of a modified bitumen waterproof membrane. The raw materials for preparing the coating, by weight, include: 10 parts emulsified bitumen, 20 parts deionized water, 61 parts emulsion, 5 parts anti-sticking agent, 1 part pH adjuster, 1 part defoamer, 0.5 parts stabilizer, 3 parts titanium dioxide, and 11 parts filler; wherein the anti-sticking agent is FEVE resin.

[0105] The preparation method of the coating for the isolation layer of the modified bitumen waterproof membrane differs from that in Example 1 only in that no curing agent is added.

[0106] (ii) The only difference between the composite waterproof membrane in this comparative example and Example 1 is that the material of the isolation layer, which is a coating, is the same as the coating used for the isolation layer of the modified bitumen waterproof membrane prepared in Comparative Example 2.

[0107] The only difference between the preparation method of the composite waterproof membrane in this comparative example and that in Example 1 is that the coating used for spraying is the same as the coating used for the isolation layer of the modified bitumen waterproof membrane prepared in Comparative Example 2.

[0108] Comparative Example 3

[0109] (a) This comparative example provides a coating for the isolation layer of a modified bitumen waterproof membrane. The raw materials for preparing the coating, by weight, include: 14 parts deionized water, 65 parts emulsion, 8 parts anti-sticking agent, 2 parts pH adjuster, 0.5 parts defoamer, 1 part stabilizer, 2 parts curing agent, 4 parts titanium dioxide, and 14 parts filler; wherein the anti-sticking agent is polytetrafluoroethylene.

[0110] The preparation method of the coating for the isolation layer of the modified bitumen waterproof membrane described above differs from that in Example 3 only in that emulsified bitumen is not added.

[0111] (ii) The only difference between the composite waterproof membrane in this comparative example and Example 3 is that the material of the isolation layer, which is a coating, is the same as the coating used for the isolation layer of the modified bitumen waterproof membrane prepared in Comparative Example 3.

[0112] The only difference between the preparation method of the composite waterproof membrane in this comparative example and that in Example 3 is that the coating used for spraying is the same as the coating used for the isolation layer of the modified bitumen waterproof membrane prepared in Comparative Example 3.

[0113] Comparative Example 4

[0114] (a) This comparative example provides a coating for the isolation layer of a modified bitumen waterproof membrane. The raw materials for preparing the coating, by weight, include: 15 parts emulsified bitumen, 14 parts deionized water, 65 parts emulsion, 2 parts pH adjuster, 0.5 parts defoamer, 1 part stabilizer, 2 parts curing agent, 4 parts titanium dioxide, and 14 parts filler; wherein the anti-sticking agent is polytetrafluoroethylene.

[0115] The preparation method of the coating for the isolation layer of the modified bitumen waterproof membrane is different from that in Example 3 only in that no anti-sticking agent is added.

[0116] (ii) The only difference between the composite waterproof membrane in this comparative example and Example 3 is that the material of the isolation layer, which is a coating, is the same as the coating used for the isolation layer of the modified bitumen waterproof membrane prepared in Comparative Example 4.

[0117] The only difference between the preparation method of the composite waterproof membrane in this comparative example and that in Example 3 is that the coating used for spraying is the same as the coating used for the isolation layer of the modified bitumen waterproof membrane prepared in Comparative Example 4.

[0118] Test case

[0119] To verify the effectiveness of the coating used as the release layer of the modified bitumen waterproof membrane, comparative tests were conducted on Examples 1-4 and Comparative Examples 1-4, and the specific results are shown in the table below. Except for the first two items in the table, all other items were tests conducted on the composite waterproof membrane. Surface energy was tested using the contact angle test method, and low-temperature cracking temperature and peel strength with the three different coatings were tested according to GB / T 18242 standard. Curing time refers to the curing time of the coating used as the release layer of the modified bitumen waterproof membrane sprayed during the preparation of the composite waterproof membrane; wetting effect refers to the wetting effect of the coating used as the release layer of the modified bitumen waterproof membrane on the modified bitumen waterproof layer of the composite waterproof membrane. In the table, the ordinary bitumen coating used in the tests was Oriental Yuhong PBC-328; the polyurethane waterproof coating was Oriental Yuhong SPU-301; and the polymer waterproof coating was Oriental Yuhong DMSC-211.

[0120] Table 1

[0121]

[0122] As shown in Table 1, all performance indicators of Examples 1-4 meet the requirements. The main problems with Comparative Example 1 are: high surface energy, poor anti-sticking effect, poor low-temperature performance, easy cracking, and low peel strength with other waterproof coatings. The main problem with Comparative Example 2 is: slow curing speed, which does not meet the production process requirements, and poor low-temperature toughness due to low strength. The main problem with Comparative Example 3 is: it cannot completely wet the modified asphalt surface to form a smooth coating, and its low-temperature flexibility only meets the requirements of SBS modified asphalt roll material type 1. At the same time, its adhesion performance with various coatings is poor. The main problem with Comparative Example 4 is: high surface energy, poor anti-sticking effect.

[0123] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A coating for the release layer of a modified bitumen waterproof membrane, characterized in that, The raw materials for preparing the coating, by weight, include: 10-20 parts emulsified asphalt, 10-20 parts water, 55-65 parts emulsion, 5-8 parts anti-sticking agent, 1-2 parts pH adjuster, 0.5-1 part defoamer, 0.5-1 part stabilizer, 2-4 parts curing agent, 3-5 parts titanium dioxide, and 10-15 parts filler; The emulsion is a modified polypropylene wax emulsion.

2. The coating according to claim 1, wherein, The emulsified asphalt is anionic emulsified asphalt.

3. The coating according to claim 1, wherein, The anti-sticking agent is at least one of polytetrafluoroethylene, vinylidene fluoride, and FEVE resin.

4. The coating according to claim 1, wherein, The curing agent is an acrylic silicone resin curing agent.

5. The coating according to claim 1, wherein, The pH adjuster is 2-amino-2-methyl-1-propanol; The defoamer is hydroxyethyl cellulose; The stabilizer is hydroxyethyl cellulose ether; The filler is at least one of heavy calcium carbonate, light calcium carbonate, and talc.

6. The method for preparing the coating according to any one of claims 1-5, characterized in that, The preparation method includes: (1) Mix the emulsion, pH adjuster, water and anti-sticking agent evenly to obtain the first component; (2) The filler and titanium dioxide are mixed evenly to obtain the second component; (3) Mix the first component, the second component and the emulsified asphalt evenly to obtain the third component; (4) Mix the third component, the stabilizer and the defoamer evenly to obtain the fourth component; (5) Mix the fourth component and the curing agent evenly to obtain the coating for the isolation layer of the modified bitumen waterproof membrane.

7. The application of the coating according to any one of claims 1-5 in the preparation of the isolation layer of modified bitumen waterproof membrane.

8. A composite waterproof membrane, characterized in that, The composite waterproof membrane comprises, in sequence: a first isolation layer, a first modified bitumen waterproof layer, a reinforcing layer, a second modified bitumen waterproof layer, and a second isolation layer; The material of at least one of the first and second isolation layers is the coating described in any one of claims 1-5.

9. The composite waterproof membrane according to claim 8, wherein, When only one of the first and second isolation layers is made of the coating described in any one of claims 1-5, the other isolation layer is made of PE film, fine sand, or mineral granules.

10. The method for preparing the composite waterproof membrane according to claim 8 or 9, characterized in that, The preparation method includes: (1) The dried and pre-impregnated reinforcing layer is immersed in a hot-melt modified asphalt bath to form a modified asphalt waterproof layer on the upper and lower surfaces of the reinforcing layer, and then the thickness is fixed to obtain a semi-finished product. (2) Spray the coating of any one of claims 1-5 onto at least one side of the modified bitumen waterproof layer of the semi-finished product; (3) When the semi-finished product obtained in step (2) is coated on both sides, the semi-finished product obtained in step (2) is subjected to water cooling treatment in sequence, and the coating is subjected to ultraviolet curing treatment and water cooling treatment at the same time as water cooling treatment to obtain the composite waterproof membrane. When the semi-finished product obtained in step (2) is coated only on one side of the modified bitumen waterproof layer, the semi-finished product obtained in step (2) is subjected to water-cooling treatment only, UV curing treatment of the sprayed coating at the same time as water-cooling treatment, and water-cooling treatment only; then a film or sand is applied to the modified bitumen waterproof layer on the other side, and finally a cooling treatment is performed to obtain the composite waterproof membrane.

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