Construction method of self-adhesive coiled material in low-temperature environment

Abstract

The invention discloses a construction method of a self-adhesive coiled material in a low-temperature environment, which comprises the following steps: S1, base layer treatment: cleaning the surface of a base layer to ensure that no water, frost and sundries exist; s2, node part treatment: carrying out additional layer treatment on internal and external corners and pipe root parts; s3, adhesive brushing: uniformly brushing the matched adhesive on the surface of the base layer, wherein the coating dosage is 0.4-0.5 kg / m; s4, waiting for curing: standing the base layer coated with the adhesive until the adhesive is cured to a surface dry state, that is, the adhesive touches sticky but no colloid is transferred; the construction method provided by the invention has the beneficial effects that the self-adhesive coiled material can still keep better bonding performance in a low-temperature environment, test data shows that the peel strength of the self-adhesive coiled material and a cement base surface in the environment of-5 DEG C reaches 1.1 N / mm or above, the lasting bonding time exceeds 72 hours, the shear strength of a lap joint of the coiled material in the environment of-10 DEG C reaches 1.6 N / mm, and the self-adhesive coiled material can still keep better bonding performance in the environment of-10 DEG C. The requirement on a base layer is reduced, and the construction quality can still be ensured under the condition that the base layer contains water.

Description

Technical Field

[0001] This invention relates to the field of temperature-controlled construction technology for self-adhesive roll materials, specifically a construction method for self-adhesive roll materials under low-temperature conditions. Background Technology

[0002] Self-adhesive waterproof membrane is a high-quality waterproof material with self-adhesive properties. The matrix is ​​composed of polymers, and currently the main components on the market are asphalt or modified rubber, with additives to form a multi-component solid mixture. Self-adhesive waterproof membrane is widely used in the construction field due to its convenient and quick use. However, its construction effect is significantly affected by the ambient temperature. When the ambient temperature is below 5℃, the fluidity of the self-adhesive layer of the membrane decreases, resulting in a significant decrease in the adhesion to the substrate. In environments below 0℃, the self-adhesive layer of the membrane hardens, loses its initial tack, and cannot achieve effective adhesion.

[0003] In existing technologies, the construction of self-adhesive waterproof membranes typically requires an ambient temperature of no less than 5°C. This limits the construction period in winter and cold regions, affecting project progress. To solve the problem of low-temperature construction, the commonly used method is to use the hot-melt method to assist construction. However, this method has the following problems: the construction process is complex, requiring special heating equipment, resulting in high energy consumption and increased construction costs. In addition, in low-temperature environments, the overlapping joints of the membrane are prone to poor sealing, leading to the risk of water seepage. Test data shows that at temperatures below 0°C, the bonding strength of the overlapping joints decreases by more than 50%, failing to guarantee the integrity of the waterproof layer. Therefore, this application proposes a construction method for self-adhesive membranes in low-temperature environments. Summary of the Invention

[0004] The purpose of this invention is to provide a method for constructing self-adhesive rolls in low-temperature environments, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for constructing self-adhesive roll materials in a low-temperature environment, comprising the following steps: S1. Substrate preparation: Clean the substrate surface to ensure there is no standing water, frost, or debris; S2. Node treatment: Apply an additional layer of treatment to the inside and outside corners and pipe roots; S3. Adhesive application: Apply the matching adhesive evenly to the substrate surface at a dosage of 0.4-0.5 kg / m². S4. Wait for curing: Let the substrate with the adhesive applied stand until the adhesive cures to a surface dry state, that is, it feels sticky to the touch but there is no transfer of adhesive. S5. Roll material laying: Align the roll material with the baseline and lay it flat with a scraper. S6. Overlap joint treatment: Control the overlap width to 80-100mm, use a hot air gun to heat the overlap part, and immediately compact it with a scraper after heating; S7. Sealing and Inspection: Seal the termination area with sealant, then check the tiling quality and repair any defects.

[0006] Preferably, the construction environment temperature of the self-adhesive roll material is not lower than -20℃.

[0007] Preferably, the base layer in S1 includes, but is not limited to, a cement mortar leveling layer, a concrete structural slab, or a metal roof.

[0008] Preferably, the temperature of the overlapping part after being heated by the hot air gun in S6 is 30-45℃.

[0009] Preferably, in step S5, the roll material is laid in sections, and each section is flattened by scraping with a scraper after every 1-2m of width.

[0010] Preferably, the sealant in S7 is a polyurethane sealant or a butyl sealant.

[0011] Preferably, the inspection of the paving quality in S7 includes using a tapping method to check for hollow areas and an observation method to check for the sealing of the overlap joints.

[0012] Preferably, the width of the additional layer in S2 is 300-500mm.

[0013] Compared with the prior art, the beneficial effects of the present invention are: by using the construction method provided in this application, the self-adhesive roll material can still maintain good adhesion performance in low temperature environment. Test data shows that the peel strength between the self-adhesive roll material and the cement base surface reaches more than 1.1 N / mm in -5℃ environment, and the holding time exceeds 72 hours. In -10℃ environment, the shear strength of the roll material overlap joint reaches 1.6 N / mm.

[0014] It reduces the requirements for the base layer and can still ensure construction quality even when the base layer is moist. Test results show that specimens constructed at -5℃ can still maintain high bonding strength after 10 freeze-thaw cycles. Compared with the traditional hot-melt method, it can not only improve the construction speed, but also reduce the energy consumption required for construction. The method improves the reliability and durability of construction. Waterproofing projects constructed using the method of this invention have increased the first-time acceptance rate of waterproof membranes in low-temperature environments. Furthermore, it reduces the leakage rate of waterproofing projects. Moreover, this method is applicable to a variety of substrates and membrane types, and has good versatility. Detailed Implementation

[0015] This invention provides a technical solution: a method for constructing self-adhesive roll materials in low-temperature environments, comprising the following steps: S1. Substrate preparation: Clean the substrate surface to ensure there is no standing water, frost, or debris; S2. Node treatment: Apply an additional layer of treatment to the inside and outside corners and pipe roots; S3. Adhesive application: Apply the matching adhesive evenly to the substrate surface at a dosage of 0.4-0.5 kg / m². S4. Wait for curing: Let the substrate with the adhesive applied stand until the adhesive cures to a surface dry state, that is, it feels sticky to the touch but there is no transfer of adhesive. S5. Roll material laying: Align the roll material with the baseline and lay it flat with a scraper. S6. Overlap joint treatment: Control the overlap width to 80-100mm, use a hot air gun to heat the overlap part, and immediately compact it with a scraper after heating; S7. Sealing and Inspection: Seal the termination area with sealant, then check the tiling quality and repair any defects. Example 1

[0016] The construction environment temperature is -5℃, the relative humidity is 65%, the base layer is a cement mortar leveling layer with a moisture content of 8%, and a self-adhesive polymer modified bitumen waterproof membrane is used. The matching adhesive is the adhesive described in Example 1 of Patent No. CN113717670B. The construction steps are as follows: (1) Substrate preparation: Remove dust and debris from the substrate surface and clean it with a vacuum cleaner; (2) Node treatment: Add a 500mm wide additional layer at the inside and outside corners; (3) Adhesive application: Apply the matching adhesive evenly to the substrate surface, with a coating amount of 0.4 kg / m²; (4) Wait for curing: Let stand at ambient temperature until the adhesive reaches a surface dry state (tacky to the touch but with no transfer of adhesive). (5) Roll material laying: Align the roll material with the baseline and lay it, and immediately use a scraper to scrape and press it flat from the middle to both sides; (6) Overlap treatment: The overlap width is 80mm. Heat the overlap edge with a hot air gun until the temperature rises to 35℃, and then use a scraper to compact it. (7) Seal the end area with polyurethane sealant, check the flatness of the paving, repair local air bubbles, and then apply a 50mm thick fine stone concrete protective layer on the waterproof layer. Example 2

[0017] The construction environment temperature is -10℃, relative humidity is 70%, the base layer is a concrete structural slab with a moisture content of 7%, and a non-asphalt-based polymer self-adhesive waterproof membrane is used. The matching adhesive is the adhesive described in Example 5 of Patent No. CN113717670B. The construction steps are as follows: (1) Substrate treatment: Clean the surface of the substrate with a wire brush to remove loose particles; (2) Node treatment: Make an additional layer 300mm wide around the pipe root; (3) Adhesive application: Apply the matching adhesive evenly to the substrate surface, with a coating amount of 0.5 kg / m²; (4) Wait for curing: Let stand at ambient temperature until the adhesive reaches a surface dry state (tacky to the touch but with no transfer of adhesive). (5) Roll material laying: The segmented laying method is adopted, and the material is flattened with a scraper after every 1m of laying width; (6) Overlap treatment: The overlap width is 100mm. Heat the overlap edge with a hot air gun until the temperature rises to 30℃, and then use a scraper to compact it. (7) Seal with butyl sealant tape, check for hollow areas by tapping, and then apply a 20mm thick cement mortar protective layer on the waterproof layer. Example 3

[0018] The construction environment temperature is -15℃, the relative humidity is 60%, the base layer is a metal roof, TPO self-adhesive roll material is used, and the matching adhesive is the adhesive described in Example 9 of Patent No. CN113717670B. The construction steps are as follows: (1) Substrate treatment: Clean the oil stains on the surface of the metal substrate with solvent; (2) Node treatment: Make an additional layer 400mm wide around the roof protrusions; (3) Adhesive application: Apply the matching adhesive evenly to the substrate surface, with a coating amount of 0.45 kg / m²; (4) Wait for curing: Let stand at ambient temperature until the adhesive reaches a surface dry state (tacky to the touch but with no transfer of adhesive). (5) Roll material laying: Align the roll material with the baseline and lay it flat immediately with a scraper; (6) Overlap treatment: The overlap width is 90mm. Heat the overlap edge with a hot air gun until the temperature rises to 40℃, and then compact it with a scraper. (7) Use metal strips and sealant to seal the composite seal, thoroughly check the bonding quality, and then apply a 30mm thick foamed concrete protective layer on the waterproof layer. Performance testing

[0019] Comparative Example 1 uses the traditional self-adhesive roll material construction method. The self-adhesive roll material is directly laid in an environment of -5℃. The results show that the peel strength between the roll material and the ground is 0.03N / mm. Leakage occurs in the water permeability test. The area of ​​hollow areas between the roll material and the base layer accounts for more than 95% of the total area. Comparative Example 2 was constructed using the hot-melt method at -10℃. The results showed that the peel strength between the roll material and the ground was basically 0, leakage occurred in the water permeability test, and the area of ​​hollow areas between the roll material and the base layer accounted for more than 98% of the total area.

[0020] The average test data for the three embodiments of the present invention are as follows: Peel strength between roll material and ground: 1.6 N / mm at -5℃; 1.4 N / mm at -10℃; 1.1 N / mm at -15℃; Test method description: Refer to GB / T23457-2017 "Pre-laid waterproof membrane" standard, and conduct the test after maintaining a constant temperature for 2 hours in the corresponding low temperature environment; Holding time: all exceed 60 hours; Test method description: Refer to GB / T4851-2014 standard, withstand a 1kg hanging weight in an environment of -5℃; Impermeability: After being kept under a water pressure of 0.3MPa for 30 minutes, all specimens showed no leakage, and the test was passed.

[0021] Overall benefits: The low-temperature construction methods provided in Examples 1-3 significantly improve the initial adhesion and long-term durability of the roll material in cold environments by controlling the curing of the adhesive to a surface-dry state before laying and using low-temperature heating overlap technology. Compared with traditional methods, this method has a simpler construction process, does not require complex preheating, improves construction efficiency by about 30%, and reduces energy consumption by more than 60%. Field applications show that this method can effectively ensure the first-time acceptance rate of waterproofing projects in low-temperature environments and reduce rework and subsequent maintenance costs.

[0022] While embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for constructing self-adhesive roll materials under low-temperature conditions, characterized in that, Includes the following steps: S1. Substrate preparation: Clean the substrate surface to ensure there is no standing water, frost, or debris; S2. Node treatment: Apply an additional layer of treatment to the inside and outside corners and pipe roots; S3. Adhesive application: Apply the matching adhesive evenly to the substrate surface at a dosage of 0.4-0.5 kg / m². S4. Wait for curing: Let the substrate with the adhesive applied stand until the adhesive cures to a surface dry state, that is, it feels sticky to the touch but there is no transfer of adhesive. S5. Roll material laying: Align the roll material with the baseline and lay it flat with a scraper. S6. Overlap joint treatment: Control the overlap width to 80-100mm, use a hot air gun to heat the overlap part, and immediately compact it with a scraper after heating; S7. Sealing and Inspection: Seal the termination area with sealant, then check the tiling quality and repair any defects.

2. The construction method for self-adhesive roll material under low-temperature environment according to claim 1, characterized in that: The construction environment temperature of the self-adhesive roll material shall not be lower than -20℃.

3. The construction method for self-adhesive roll material under low-temperature environment according to claim 1, characterized in that, The base layer in S1 includes, but is not limited to, cement mortar leveling layer, concrete structural slab or metal roof.

4. The construction method for self-adhesive roll material under low-temperature environment according to claim 1, characterized in that, The temperature of the overlapping part after being heated by the hot air gun in S6 is 30-45℃.

5. The construction method for self-adhesive roll material under low-temperature environment according to claim 1, characterized in that, In S5, the roll material is laid in sections, and each section is flattened by scraping with a scraper after every 1-2m of width.

6. The construction method for self-adhesive roll material under low-temperature environment according to claim 1, characterized in that, The sealant in S7 is either polyurethane sealant or butyl sealant.

7. The construction method for self-adhesive roll material under low-temperature environment according to claim 1, characterized in that, The S7 step of checking the tiling quality includes using a tapping method to check for hollow areas and an observation method to check the sealing of the overlap joints.

8. The construction method for self-adhesive roll material under low-temperature environment according to claim 1, characterized in that, The width of the additional layer in S2 is 300-500 mm.