Non-cured rubber asphalt-polyurethane waterproof coating composite construction method

Abstract

The invention discloses a non-cured rubber asphalt-polyurethane waterproof coating composite construction method, and belongs to the technical field of waterproofing. The construction method comprises the following steps: firstly, coating a conventional commercially available non-cured rubber asphalt waterproof coating on a concrete layer in a hot melting manner at an interval of 1 minute, and then blade-coating a polyurethane waterproof coating on the surface of the non-cured rubber asphalt waterproof coating by 1.0-1.5 mm once. In the invention, the polyurethane waterproof coating is de-blocked on a high-temperature surface generated when the non-cured rubber asphalt is melted, releases a high-activity NCO group, and quickly generates chemical reaction with phenolic hydroxyl groups in the non-cured rubber asphalt in the presence of a high-efficiency catalyst to form a composite waterproof coating which is combined through the chemical reaction; the problems that the bonding force between non-cured rubber asphalt-polyurethane waterproof coating composite waterproof layers is poor, and the bonding force is prone to attenuation are solved.

Description

Technical Field

[0001] The invention discloses a composite construction method of a non-curing rubber asphalt-polyurethane waterproof coating, belonging to the technical field of waterproofing. Background Art

[0002] Waterproof materials are a very important type of building materials, and the quality of waterproof materials directly affects the performance of buildings. Waterproof materials are mainly composed of asphalt-based waterproof membranes, polymer membranes and waterproof coatings. Among them, asphalt-based waterproof membranes are used in the largest amount and are the most widely used. Waterproof membranes can be laid after heating and hot melting or laid directly without hot melting to form a waterproof layer. It is very convenient and quick to construct on a large and flat waterproof base surface; waterproof coatings can only form a waterproof layer after curing and curing after application. It can be applied to flat base surfaces and irregular or complex waterproof parts. The design styles of modern buildings are becoming more and more diverse and complex. Irregular parts and diversified waterproof designs have expanded the use of waterproof coatings to a certain extent. On the other hand, with the development of my country's construction industry, building repair has become an increasingly important development direction of the industry. In repair projects, more waterproof parts and base surfaces are irregular cracks or complex base surface parts. Waterproof coatings are a better choice, and the market share of waterproof coatings will also show an increasing trend.

[0003] Non-curing rubber asphalt waterproof coating is a waterproof coating that maintains a viscous paste during its service life, with rubber, asphalt, and softening oil as the main components, and is mixed with temperature control agents and fillers. This coating can seal the cracks and pores of the base layer and can adapt to irregular and complex construction work surfaces; it does not solidify for a long time after contact with the air, and always maintains the characteristics of viscous colloid, has strong self-healing ability, sticks to touch, is difficult to peel, and still has good bonding properties at -20°C. It can solve the problems of waterproof layer fracture, flexural fatigue, or premature aging under high stress due to the stress of base cracking transferred to the waterproof layer; at the same time, the viscosity of the creep material enables it to well seal the pores and cracks of the base layer, solving the problem of water leakage in the waterproof layer. Non-curing rubber asphalt waterproof coating is very suitable for irregular and complex waterproof base surfaces and repair waterproofing projects. However, since the material is not cured and lacks high mechanical strength, it usually needs to be composited with waterproof membranes to form a durable and reliable waterproof layer. Therefore, this construction scheme is limited in use on complex and irregular working surfaces. A better solution is the composite construction of non-curing rubber asphalt waterproof coating and polyurethane waterproof coating.

[0004] Theoretically, the asphalt component in the non-curing rubber asphalt waterproof coating component contains phenolic hydroxyl groups, which can react chemically with the isocyanate group (NCO) in the polyurethane waterproof coating component to form a combination of the two waterproof coatings. In fact, there are still several problems that are difficult to solve in the composite of non-curing rubber asphalt waterproof coating and polyurethane waterproof coating: ① The non-curing rubber asphalt waterproof coating contains softening oil with low density, which will migrate upward with time and conditions, reducing the bonding force between the coatings. ② Non-curing asphalt waterproof coatings are easily swollen by aromatic solvents, which reduces their bonding properties. ③ The phenolic hydroxyl groups in the non-curing rubber asphalt waterproof coating component and the residual NCO groups in the common polyurethane waterproof coating component have low reaction activity under normal temperature conditions. ④ Common polyurethane waterproof coatings mostly contain aromatic solvents, which contain low catalyst content and low activity. This design is mainly to ensure the good storage stability of polyurethane waterproof coatings, that is, to reduce the amount of catalyst and its activity as much as possible under the condition of meeting the surface drying speed. Based on the above reasons, the research progress on the composite construction method of non-curing rubber asphalt-polyurethane waterproof coating is relatively slow. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of poor adhesion and easy attenuation of adhesion between non-curing rubber asphalt waterproof coating and polyurethane waterproof coating. In order to achieve the technical effect of the present invention, the following technical scheme is adopted:

[0006] A composite construction method for a non-curing rubber asphalt-polyurethane waterproof coating, wherein the non-curing rubber asphalt waterproof coating in the construction method is a hot-melt non-curing rubber asphalt waterproof coating commercially available in the field of building waterproofing, and its performance meets the requirements of standard JC / T 2428-2017; the construction method is to firstly apply the non-curing rubber asphalt waterproof coating to a concrete layer by hot-melt, within an interval of less than 1 minute, and then scrape the polyurethane waterproof coating on the surface of the non-curing rubber asphalt waterproof coating, and scrape the polyurethane coating 1.0 to 1.5 mm at a time.

[0007] A non-curing rubber asphalt-polyurethane waterproof coating composite construction method, the preparation method of the polyurethane waterproof coating comprises the following steps:

[0008] Step 1: 120.00-200.00 parts by mass of polyether diol, 40.00-75.00 parts by mass of polyether triol, 30.00-100.00 parts by mass of polytetramethylene ether glycol (PTMEG), 3.00-3.50 parts by mass of dispersant, 40.00-120.00 parts by mass of liquid filler and 110.00-150.00 parts by mass of plasticizer are added to the reactor, stirred and heated to above 90°C, and then 500.00-620.00 parts by mass of powder filler, 1.20-2.50 parts by mass of pigment and 0.80-1.00 parts by mass of anti-settling agent are slowly added in 4-5 batches, the material temperature in the reactor is not lower than 90°C during the feeding process, the feeding time is not less than 1 hour, and after the addition, the dispersion is stirred for 0.5-1.0 hours, and the temperature is raised to 110°C-120°C;

[0009] Step 2: vacuum dehydration for 2 hours at 110°C to 120°C and vacuum -0.08MPa to -0.09MPa, and detect that the moisture content of the material is below 0.05%. Turn off the vacuum pump, introduce nitrogen protection, and cool to 75-80°C;

[0010] Step 3: In a nitrogen atmosphere, slowly add 80.00-102.00 parts by mass of aliphatic diisocyanate at 75-80°C, the addition time is not less than 1 hour, the material temperature during the process shall not exceed 85°C, and after the addition is completed, keep the reaction at 80°C-90°C for 3-4 hours;

[0011] Step 4: cooling to 75-80° C., adding 50.00-100.00 parts by mass of a capping agent and 0.50-0.75 parts by mass of a first catalyst within 0.5-1.0 hour, and then keeping the temperature at 80-90° C. for 2-3 hours, and determining the NCO content in the material by the di-n-butylamine method (HGT 2409-1992). When the NCO content is less than 0.1%, the reaction is considered to be complete; cooling to 75-80° C., adding 11.00-16.00 parts by mass of a latent curing agent, and keeping the temperature at 75-80° C. for 1 hour;

[0012] Step 5: Add 3.50-6.00 parts by mass of light stabilizer, 4.00-6.30 parts by mass of antioxidant and 4.00-6.00 parts by mass of ultraviolet absorber, start cooling, add 0.50-0.75 parts by mass of the first catalyst, 0.50-1.00 parts by mass of the second catalyst and 1.50-2.10 parts by mass of the defoaming agent at 50-60°C, continue to keep warm and stir at 50-60°C for 0.5-1.0 hour to obtain the polyurethane waterproof coating.

[0013] The polyether diol is one of polyether N210 and polyether N220 or a mixture of two thereof; the polytetramethylene ether diol (PTMEG) is one of PTMEG-1000 and PTMEG-2000 or a mixture of two thereof; the polyether triol is one of polyether 330N and polyether 3050; the aliphatic diisocyanate is one of hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI); the liquid filler The invention relates to 52# chlorinated paraffin; the plasticizer is one of dioctyl phthalate (DOP), di-n-butyl phthalate (DBP), and diisononyl phthalate (DINP); the powder filler is a mixture of 800-mesh heavy calcium carbonate and 1250-mesh talc or a mixture of 800-mesh heavy calcium carbonate and 1250-mesh kaolin; the pigment is Japanese Mitsubishi carbon black MA100; the anti-settling agent is CLAYMINTON, a product of Zhejiang Yanheng Technology Co., Ltd. 48; the dispersant is DISPERSER BYK 108, a product of German BYK; the defoamer is DEFOAMERBYK 065, a product of German BYK; the latent curing agent is one of ALT-403 and ALT-402, products of Elite Chemical; the first catalyst is one of stannous octoate (T-9) and dibutyltin dilaurate (T-12); the second catalyst is one of triethylenediamine and tetramethylhexanediamine; the ultraviolet absorber is one of UV-531 and UV-329; the antioxidant is one of antioxidant 1010 and antioxidant 264; the light stabilizer is one of Tinuvin 770DF and Tinuvin 292, products of BASF.

[0014] The present invention has the following beneficial effects:

[0015] (1) The polymer in the polyurethane waterproof coating of the present invention is designed to be a blocked polyurethane with a relatively high content of reactive isocyanate groups, that is, the isocyanate groups are protected at room temperature and under storage conditions, and deblocking reactions occur under high temperature conditions to release active isocyanate groups. This design effectively avoids the consumption and loss of isocyanate groups in the polyurethane waterproof coating during long-term storage and transportation, increases the reaction points between the polyurethane and the non-cured rubber asphalt, ensures a relatively high concentration of active reactants between the two phases, and is beneficial to improving the reaction rate between the two phases and the bonding performance between the composite coatings.

[0016] (2) The construction method of the present invention is conducive to shortening the construction period: applying the polyurethane waterproof coating on the surface of the high-temperature coating after the non-curing rubber asphalt is melted provides favorable conditions for the deblocking reaction of the polyurethane and the combination curing reaction between the two phases (active NCO and phenolic hydroxyl groups), which not only accelerates the chemical reaction within the polyurethane coating and between the two phases of the coating, but also shortens the curing time.

[0017] (3) The adhesion between the two-phase coatings in the present invention is strong and not easy to decay: Based on the coating formula design and construction method of (1) and (2), the two-phase coating begins to undergo a very rapid cross-linking and curing reaction during the construction process, that is, the two-phase coating can achieve strong adhesion in a relatively short period of time and can prevent the oil in the non-cured rubber asphalt from seeping out to a certain extent; while in the conventional non-cured rubber asphalt-polyurethane composite method, due to the slow curing reaction rate, the oil in the non-cured rubber asphalt will gradually penetrate between the two-phase coating to form a certain isolation layer, weakening the cross-linking and curing reaction between the two phases and causing their bonding strength to gradually decay. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 Schematic diagram of non-curing rubber asphalt-polyurethane waterproof coating composite waterproof coating DETAILED DESCRIPTION

[0018] The present invention is described in detail below through examples. It is necessary to point out that the examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by technicians in this field based on the content of the present invention also fall within the scope of protection of the present invention.

[0019] Example 1

[0020] Preparation method of polyurethane waterproof coating:

[0021] Step 1: 20.00 parts by mass of polyether 210, 150.00 parts by mass of polyether 220, 68 parts by mass of polyether 330N, 50.00 parts by mass of PTMEG-2000, 3.00 parts by mass of DISPERSERBYK108, 120.00 parts by mass of chlorinated paraffin and 150.00 parts by mass of DBP are added into a reactor, stirred and heated to above 90°C, and then 150.00 parts by mass of 1250 mesh talc, 350.00 parts by mass of 800 mesh heavy calcium carbonate, 1.20 parts by mass of carbon black MA100 and 0.80 parts by mass of CLAYMINTON 48 are slowly added in 4-5 batches, during which the material temperature in the reactor is not lower than 90°C, the feeding time is not less than 1 hour, and after the addition is completed, the mixture is dispersed and stirred for 0.5-1.0 hours, and the temperature is raised to 110°C to 120°C;

[0022] Step 2: vacuum dehydration for 2 hours at 110°C to 120°C and vacuum -0.08MPa to -0.09MPa, and detect that the moisture content of the material is below 0.05%. Turn off the vacuum pump, introduce nitrogen protection, and cool to 75-80°C;

[0023] Step 3: In a nitrogen atmosphere, slowly add 100.00 parts by mass of IPDI at 75-80°C for no less than 1 hour. During the process, the material temperature must not exceed 85°C. After the addition, keep the reaction at 80-90°C for 3-4 hours;

[0024] Step 4: Cooling to 75-80°C, adding 50.00 parts by mass of acetone oxime and 0.50 parts by mass of stannous octoate (T-9) within 1.0 hour, and then keeping warm at 80-90°C for 3 hours, and determining the NCO content in the material by the di-n-butylamine method. When the NCO content is less than 0.1%, the reaction is considered complete; cooling to 75-80°C, adding 13.00 parts by mass of ALT-403, and keeping warm at 75-80°C for 1 hour;

[0025] Step 5: Add 3.50 parts by mass of Tinuvin 770DF, 6.30 parts by mass of antioxidant 1010 and 4.00 parts by mass of ultraviolet absorber UV-531, start cooling, add 0.50 parts by mass of T-9, 0.8 parts by mass of triethylenediamine and 1.50 parts by mass of DEFOAMERBYK065 at 50-60°C, continue to keep warm and stir at 50-60°C for 0.5 hour, filter, and discharge to obtain the polyurethane waterproof coating of Example 1.

[0026] Preparation method of non-curing rubber asphalt-polyurethane waterproof coating composite waterproof coating:

[0027] like Figure 1 As shown, first, a piece of 1-2 mm thick cotton cloth is laid on half of the area of ​​the thin cement board, which can be fixed with tape, and a 1-2 mm non-cured rubber asphalt waterproof coating is hot-melt applied on the other half of the area close to the cotton cloth (leaving a gap), and the polyurethane waterproof coating prepared in Example 1 is scraped for 1 minute, with a thickness of 1-2 mm, and the area is sufficient to cover the non-cured rubber asphalt waterproof coating and the thick cotton cloth. (The surface of the cotton cloth fiber contains a relatively rich amount of active hydroxyl groups that can react with isocyanate groups.) The cotton cloth area is appropriately heated with a liquefied gas flame torch from one side of the thin cement board to fully cure the polyurethane waterproof coating on the surface of the thick cotton cloth.

[0030] Embodiment 2-5

[0031] The preparation method of the polyurethane waterproof coating in Examples 2-5 is prepared according to the method and steps of Example 1, and the raw material ratio is added according to Table 1. The specific preparation process is not repeated here.

[0032] The preparation method of the non-cured rubber asphalt-polyurethane waterproof coating composite waterproof coating in Examples 2-5 is exactly the same as the method in Example 1, and will not be repeated here.

[0033] Table 1 Polyurethane waterproof coating formulations in various embodiments and comparative examples

[0034]

[0035]

[0036] Comparative Example 1

[0037] Conventional one-component polyurethane waterproof coating preparation method:

[0038] Step 1: 200.00 parts by mass of polyether 220, 75.00 parts by mass of polyether 330N, 30.00 parts by mass of PTMEG-2000, 3.00 parts by mass of DISPERSERBYK108, 150.00 parts by mass of chlorinated paraffin and 120.00 parts by mass of DBP are added into a reactor, stirred and heated to above 90°C, and then 250.00 parts by mass of 1250 mesh talc, 300.00 parts by mass of 800 mesh heavy calcium carbonate, 1.20 parts by mass of carbon black MA100 and 0.80 parts by mass of CLAYMINTON 48 are slowly added in 4 to 5 batches. During the addition process, the material temperature in the reactor is not lower than 90°C, and the addition time is not less than 1 hour. After the addition is completed, the mixture is dispersed and stirred for 0.5 to 1.0 hours, and the temperature is raised to 110°C to 120°C;

[0039] Step 2: vacuum dehydration for 2 hours at 110°C to 120°C and vacuum -0.08MPa to -0.09MPa, and detect that the moisture content of the material is below 0.05%. Turn off the vacuum pump, introduce nitrogen protection, and cool to 75-80°C;

[0040] Step 3: In a nitrogen atmosphere, slowly add 48.00 parts by mass of TDI at 75-80°C for no less than 1 hour. During the process, the material temperature must not exceed 85°C. After the addition, keep the reaction at 80-90°C for 3-4 hours;

[0041] Step 4: Cool down to 75-80°C, add 14.00 parts by mass of ALT-402, and keep warm at 75-80°C for 1 hour;

[0042] Step 5: Add 4.00 parts by mass of Tinuvin 770DF, 6.20 parts by mass of antioxidant 1010 and 4.20 parts by mass of ultraviolet absorber UV-329, start cooling, add 1.00 parts by mass of T-9, 1.50 parts by mass of DEFOAMERBYK065 and 110.00 parts by mass of S-1000 at 50-60°C, continue to keep warm and stir at 50-60°C for 0.5 hour, filter, and discharge to obtain the conventional one-component polyurethane waterproof coating of Comparative Example 1.

[0043] Comparative Example 2

[0044] The proportions of each component of the conventional polyurethane waterproof coating of Comparative Example 2 are detailed in Table 1. The preparation method and steps are exactly the same as those in Comparative Example 1 and will not be repeated here.

[0045] Preparation method of non-cured rubber asphalt-polyurethane composite waterproof layer in comparative example:

[0046] The polyurethane waterproof coating used in Comparative Examples 1-2 is a conventional one-component polyurethane waterproof coating. When preparing the composite waterproof layer, the one-component polyurethane waterproof coating prepared in the comparative example can be applied only after the temperature of the non-curing rubber asphalt waterproof coating coating drops to room temperature, and one end of the cotton cloth does not need to be heated. (Conventional polyurethane waterproof coatings are reactive at room temperature and contain volatile solvents. High-temperature application will cause more pores in the coating, greatly affecting the coating performance.) The remaining steps are consistent with those described in Examples 1-5.

[0047] Method for measuring the adhesion between composite waterproof coatings: Hold the cotton cloth and the polyurethane layer, apply uniform force perpendicular to the direction of the thin cement board until the coating is completely broken, and determine the strength of the adhesion between the non-curing rubber asphalt and the polyurethane coating based on the cross-section.

[0048] The results of the composite waterproof layer performance test in the embodiments and comparative examples are shown in Table 2:

[0049] Table 2 Performance measurement results of composite waterproof layer in examples and comparative examples

[0050]

[0051]

[0052] Note: ① The reactive NCO content in the finished polyurethanes of Examples 1-5 of the present invention in Table 2 is the active NCO content generated after the theoretical deblocking reaction. Based on the formula design of the present invention, the products do not contain active NCO groups at room temperature, that is, the NCO groups are blocked and cannot be measured according to HGT 2409-1992. ② Conventional one-component polyurethane 1 and conventional one-component polyurethane 2 in Comparative Examples 1-2 are both non-blocked, that is, the products contain reactive NCO groups at room temperature, and their contents are measured according to HGT2409-1992.

[0053] The polyurethane waterproof coating prepared by the present invention undergoes a deblocking reaction under high temperature conditions, releasing a high content of active NCO groups, which rapidly undergo a crosslinking and curing reaction with phenolic hydroxyl groups under high temperature and high-efficiency catalytic conditions, so that the two-phase coating can achieve very strong adhesion in a short time, and also avoids the problem of oil seepage in the non-curing rubber asphalt coating affecting the crosslinking and bonding between the solid layers during the long curing process. It can be seen from the data in Table 2 that the bonding effect between the composite coatings prepared by the present invention is better, and the fracture mode between the coatings is 100% cohesive failure of the non-curing part, and it does not decay for a long time. From Example 1 to Example 5, the higher the design value of the NCO content in the polyurethane waterproof coating formula, the higher the hardness of the coating, but too high an NCO content will also cause a small amount of bulging on the coating surface.

[0054] The conventional polyurethane waterproof coating in Comparative Example 1-2 is a non-enclosed polyurethane, which has the following main differences from the polyurethane in the present invention: ① The reactive NCO content in the finished product is low, and the reactive groups are few, see Table 2 for details; ② In order to ensure the storage period, the catalytic content is low, the reaction activity is low, and the reaction activity of NCO with the phenolic hydroxyl group in the non-curing rubber asphalt waterproof coating is lower than that of moisture and alcohol hydroxyl group; ③ It can only be constructed under normal temperature conditions, under which the reaction rate of NCO with phenolic hydroxyl group is slow. The above three characteristics of conventional polyurethane waterproof coatings are well known to those skilled in the art and are the current status of the characteristics of this type of product.

[0055] From the data in Table 2, it can be seen that the composite coatings in Comparative Examples 1 and 2 need to be cured for a longer time to achieve a strong bonding force between the coatings, and their optimal bonding effect is also significantly worse than that of Examples 1-5, and as time goes on, the bonding force between the composite coatings in Comparative Examples 1 and 2 has a significant attenuation. The polyurethane waterproof coatings in Comparative Examples 1-2 are conventional non-enclosed single-component polyurethanes, which contain fewer active NCO groups (i.e., fewer bonding points with the non-cured rubber asphalt coating part), and cannot be applied at high temperatures. The reaction activity with the phenolic hydroxyl group in the non-cured rubber asphalt under normal temperature and low catalytic activity conditions is low; on the other hand, during the long-term curing process, the oil in the non-cured rubber asphalt will gradually seep out, which has a negative impact on the curing and cross-linking between the coatings. Therefore, the composite coatings in Comparative Examples 1 and 2 show slow curing speed, poor bonding force, and obvious attenuation with time.

Claims

1. A composite construction method of non-curing rubber asphalt-polyurethane waterproof coating, characterized in that: First, hot-melt apply the non-curing rubber asphalt waterproof coating to the concrete layer within 1 minute, and then scrape the polyurethane waterproof coating on the surface of the non-curing rubber asphalt waterproof coating. Apply 1.0 to 1.5 mm of the polyurethane coating at a time.

2. A non-curing rubber asphalt-polyurethane waterproof coating composite construction method according to claim 1, characterized in that: The preparation method of the polyurethane waterproof coating comprises the following steps: Step 1: 120.00-200.00 parts by mass of polyether diol, 40.00-75.00 parts by mass of polyether triol, 30.00-100.00 parts by mass of polytetramethylene ether glycol (PTMEG), 3.00-3.50 parts by mass of dispersant, 40.00-120.00 parts by mass of liquid filler and 110.00-150.00 parts by mass of plasticizer are added to the reactor, stirred and heated to above 90°C, and then 500.00-620.00 parts by mass of powder filler, 1.20-2.50 parts by mass of pigment and 0.80-1.00 parts by mass of anti-settling agent are slowly added in 4-5 batches, the material temperature in the reactor is not lower than 90°C during the feeding process, the feeding time is not less than 1 hour, and after the addition, the dispersion is stirred for 0.5-1.0 hours, and the temperature is raised to 110°C-120°C; Step 2: vacuum dehydration for 2 hours at 110°C to 120°C and vacuum -0.08MPa to -0.09MPa, and detect that the moisture content of the material is below 0.05%. Turn off the vacuum pump, introduce nitrogen protection, and cool to 75-80°C; Step 3: In a nitrogen atmosphere, slowly add 80.00-102.00 parts by mass of aliphatic diisocyanate at 75-80°C, the addition time is not less than 1 hour, the material temperature during the process shall not exceed 85°C, and after the addition is completed, keep the reaction at 80°C-90°C for 3-4 hours; Step 4: Cooling to 75-80°C, adding 50.00-100.00 parts by mass of a capping agent and 0.50-0.75 parts by mass of a first catalyst within 0.5-1.0 hour, and then keeping warm at 80-90°C for 2-3 hours, and determining the NCO content in the material by the di-n-butylamine method (HGT2409-1992). When the NCO content is less than 0.1%, the reaction is considered complete; cooling to 75-80°C, adding 11.00-16.00 parts by mass of a latent curing agent, and keeping warm at 75-80°C for 1 hour; Step 5: Add 3.50-6.00 parts by mass of light stabilizer, 4.00-6.30 parts by mass of antioxidant and 4.00-6.00 parts by mass of ultraviolet absorber, start cooling, add 0.50-0.75 parts by mass of the first catalyst, 0.50-1.00 parts by mass of the second catalyst and 1.50-2.10 parts by mass of the defoaming agent at 50-60°C, continue to keep warm and stir at 50-60°C for 0.5-1.0 hour to obtain the polyurethane waterproof coating.

3. A non-curing rubber asphalt-polyurethane waterproof coating composite construction method according to claim 2, characterized in that: The polyether diol is one of polyether N210 and polyether N220 or a mixture of the two; The polytetramethylene ether glycol (PTMEG) is a mixture of one or two of PTMEG-1000 and PTMEG-2000; The polyether triol is one of polyether 330N and polyether 3050; The aliphatic diisocyanate is one of hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI); The liquid filler is 52# chlorinated paraffin; The plasticizer is one of dioctyl phthalate (DOP), di-n-butyl phthalate (DBP), and diisononyl phthalate (DINP); The powder filler is a mixture of 800 mesh heavy calcium carbonate and 1250 mesh talc or a mixture of 800 mesh heavy calcium carbonate and 1250 mesh kaolin; The pigment is Japanese Mitsubishi carbon black MA100; The anti-settling agent is CLAYMINTON 48, a product of Zhejiang Yanheng Technology Co., Ltd.; The dispersant is DISPERSER BYK108, a product of German BYK Company; The defoamer is DEFOAMERBYK065, a product of German BYK Company; The latent curing agent is one of ALT-403 and ALT-402 produced by Elite Chemicals; The first catalyst is one of stannous octoate (T-9) and dibutyltin dilaurate (T-12); The second catalyst is one of triethylenediamine and tetramethylhexanediamine; The ultraviolet absorber is one of UV-531 and UV-329; The antioxidant is one of antioxidant 1010 and antioxidant 264; The light stabilizer is one of the products of BASF, Tinuvin 770DF and Tinuvin 292.

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