A self-heating type wet-laid waterproofing membrane and a preparation method thereof

Abstract

The present application relates to the technical field of underground engineering waterproofing, and particularly relates to a self-heating wet-laid waterproofing membrane and a preparation method thereof, the self-heating wet-laid waterproofing membrane comprises, from bottom to top, a lower anti-adhesion release film, a self-heating material layer, a lower modified asphalt layer, a long-fiber polyester base layer, an upper modified asphalt layer and an upper anti-adhesion release film; the self-heating material layer is formed by spraying or spraying the self-heating material, and the self-heating material comprises the following raw materials in parts by mass: calcium oxide 20-35 parts, anhydrous magnesium sulfate 5-10 parts and activated carbon 3-6 parts. The present application utilizes the reaction between the self-heating material layer and the moisture of the base layer to uniformly release heat, improves the bonding uniformity, and can utilize the moisture of the base layer to avoid bonding failure caused by moisture retention of the base layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground engineering waterproofing, in particular to a self-heating wet-laid waterproofing membrane and a preparation method thereof. BACKGROUND

[0002] In recent years, there are more and more waterproof and anti-permeation projects such as basements, tunnels and subways, and waterproof construction is of great significance to underground projects. The waterproof materials used in waterproof construction are mainly coatings, sheets or membranes. Asphalt waterproofing membranes are widely used in waterproofing projects because they can be produced industrially and are easy to use. Asphalt waterproofing membranes are the leading product of building waterproofing materials in China. The preparation method of asphalt waterproofing membranes generally involves first impregnating SBS and tackifying resin modified petroleum asphalt base on a carcass, and then covering the surface of the base with a peelable release film made of anti-sticking material. This type of waterproofing membrane has good adhesion, can be constructed at room temperature, and has a fast construction speed. However, due to the humid and low-temperature environment of underground construction, the adhesion between the asphalt waterproofing membrane and the base under low-temperature conditions is greatly reduced, and adhesion failure occurs easily, resulting in water leakage and other phenomena, which cannot guarantee the firm adhesion of the waterproof layer to the base in humid and cold regions. The existing SBS modified asphalt waterproofing membrane uses hot melt construction to bond with the base. Before construction, the bonding surface of the membrane is heated to improve the bonding effect. However, due to the non-uniform operation of construction personnel, uneven heating, and other factors, excessive heating can damage the internal structure of the asphalt membrane and affect its performance, while insufficient heating cannot achieve full adhesion. Heating and temperature rising have the following problems: 1. The adhesion between the waterproofing membrane and the base is greatly affected by human factors, and the adhesion uniformity is poor; 2. The waterproofing membrane is easily affected by the moisture of the base, resulting in adhesion failure. SUMMARY

[0003] To solve the problems of poor adhesion uniformity between the waterproofing membrane and the base and adhesion failure caused by humid construction environment in the prior art, the present application provides a self-heating wet-laid waterproofing membrane and a preparation method thereof. The reaction between the self-heating material layer and the moisture of the base uniformly releases heat, improving the adhesion uniformity, and utilizing the moisture of the base to avoid adhesion failure caused by moisture retention.

[0004] In a first aspect, the present application provides a self-heating wet-laid waterproofing membrane, which comprises, from bottom to top, a lower anti-sticking release film, a self-heating material layer, a lower modified asphalt layer, a long-fiber polyester carcass layer, an upper modified asphalt layer and an upper anti-sticking release film.

[0005] The lower and upper anti-sticking isolation films are preferably PET single-side silicon oil isolation films. The lower and upper anti-sticking isolation films can protect the same-side bitumen layer and prevent the same-side bitumen layer from aging, and can also prevent water. The lower anti-sticking isolation film can also prevent adhesion failure caused by water or dust adhering to the surface thereof. The long-fiber polyester base layer is light in weight, high in strength, and excellent in toughness, durability and abrasion resistance. The long-fiber polyester base layer can form an isolation layer after being combined with bitumen, and has the functions of waterproofing and heat preservation.

[0006] The self-heating material layer is formed by spraying or spraying the self-heating material, and the self-heating material comprises raw materials in the following mass fractions: calcium oxide 20-35 parts, anhydrous magnesium sulfate 5-10 parts, and activated carbon 3-6 parts. Calcium oxide has hygroscopicity and can react with water to generate calcium hydroxide and a large amount of heat, which can act as a drying agent to absorb moisture between the waterproofing membrane and the base layer, and as a fluxing agent to increase the temperature between the waterproofing membrane and the base layer by using the heat generated by water absorption, thereby improving the adhesion effect, and the generation of calcium hydroxide can extend the service life of the waterproofing membrane to a certain extent. Anhydrous magnesium sulfate and calcium oxide work together to absorb moisture in the air and release heat. Since anhydrous magnesium sulfate is a neutral compound, using it in the self-heating material layer can also reduce the amount of calcium oxide used, while ensuring the heat release effect and reducing the influence of large pH changes in the self-heating material layer on the lower modified bitumen layer. Activated carbon has a large specific surface area and can adsorb moisture in the air together with anhydrous magnesium sulfate and calcium oxide to avoid the influence of membrane bulging on the adhesion effect.

[0007] Further, the preparation method of the self-heating material comprises the following steps:

[0008] Step (1): calcium oxide, anhydrous magnesium sulfate and activated carbon are weighed according to the proportion;

[0009] Step (2): the calcium oxide, anhydrous magnesium sulfate and activated carbon weighed in step (1) are added to a stirrer and stirred to obtain the self-heating material.

[0010] Further, in step (2), the stirring time is 20-30 minutes, and the stirring speed is 100-150 revolutions per minute.

[0011] Further, the calcium oxide is a 200-mesh powder, and preferably an effective content of ≥99% calcium oxide powder. The anhydrous magnesium sulfate is a 60-160-mesh powder, and preferably an effective content of ≥98% anhydrous magnesium sulfate powder. The activated carbon is a 80-mesh powdered wood-based activated carbon.

[0012] Further, the lower modified asphalt layer and the upper modified asphalt layer comprise the following raw materials in mass fraction: 100-120 parts of base asphalt, 40-65 parts of tackifying filler oil, 8-16 parts of SBS modifier, 10-15 parts of SBR modifier, 4-8 parts of C9 petroleum resin, and 50-75 parts of filler.

[0013] Further, the filler is at least one of talcum powder, heavy calcium, and bentonite.

[0014] In the second aspect, the application provides a preparation method of the self-heating wet-laid waterproof roll material, comprising the following steps:

[0015] S1: after mixing the base asphalt and the tackifying filler oil, the temperature is increased to 140-160 DEG C;

[0016] S2: the SBR modifier is added to the system of the base asphalt and the tackifying filler oil, and stirring and dispersion are carried out and the temperature is continuously increased to 180 DEG C;

[0017] S3: the SBS modifier is added to the mixed system obtained in S2, and the temperature is kept at 180 DEG C for 2h to obtain a mixture;

[0018] S4: after grinding the mixture obtained in S3, the C9 petroleum resin and the filler are sequentially added, and stirring and mixing are carried out respectively to obtain the modified asphalt;

[0019] S5: the modified asphalt obtained in S4 is uniformly coated on the lower side of the long-fiber polyester base layer to form a lower modified asphalt layer; the modified asphalt obtained in S4 is uniformly coated on the upper side of the long-fiber polyester base layer to form an upper modified asphalt layer; the upper anti-adhesion release film is covered on the upper surface of the upper modified asphalt layer to obtain a pre-prepared waterproof roll material;

[0020] S6: after the lower modified asphalt layer is cooled, the water on the lower surface of the lower modified asphalt layer is removed, the self-heating material is uniformly sprayed or sprayed on the lower surface of the lower modified asphalt layer to form a self-heating material layer; the lower anti-adhesion release film is covered on the lower surface of the self-heating material layer, and the self-heating wet-laid waterproof roll material is obtained after winding.

[0021] Further, the amount of the self-heating material is 20-30g / m 2 .

[0022] The application has the following beneficial effects:

[0023] The self-heating type wet-laid waterproof roll and the preparation method thereof are introduced with a self-heating material layer, so that the self-heating material layer reacts with moisture of a base layer during construction, uniformly releases heat, improves temperature of an asphalt layer below, and improves bonding effect of the waterproof roll in a low-temperature environment. Calcium oxide reacts with moisture of the base layer to release heat, anhydrous magnesium sulfate is used together with activated carbon to absorb water vapor generated in a heat reaction process, so as to avoid adverse effects of bulging of the waterproof roll on the bonding effect, and on the other hand, the anhydrous magnesium sulfate can generate heat while absorbing water vapor, and assist the calcium oxide to heat the waterproof layer and the base layer, so that the bonding is more firm. DETAILED DESCRIPTION

[0024] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0025] Embodiment 1

[0026] A self-heating material, the preparation method comprising the following steps:

[0027] Step (1): 20 parts by weight of calcium oxide, 10 parts by weight of anhydrous magnesium sulfate and 6 parts by weight of activated carbon are weighed respectively;

[0028] Step (2): the weighed calcium oxide, anhydrous magnesium sulfate and activated carbon in step (1) are added into a stirrer, and stirred at a speed of 130 revolutions per minute for 20 minutes to obtain the self-heating material.

[0029] Embodiment 2

[0030] A self-heating material, the preparation method comprising the following steps:

[0031] Step (1): 25 parts by weight of calcium oxide, 8 parts by weight of anhydrous magnesium sulfate and 5 parts by weight of activated carbon are weighed respectively;

[0032] Step (2): the weighed calcium oxide, anhydrous magnesium sulfate and activated carbon in step (1) are added into a stirrer, and stirred at a speed of 130 revolutions per minute for 20 minutes to obtain the self-heating material.

[0033] Embodiment 3

[0034] A self-heating material, the preparation method comprising the following steps:

[0035] Step (1): 30 parts by weight of calcium oxide, 6 parts by weight of anhydrous magnesium sulfate and 4 parts by weight of activated carbon are weighed respectively;

[0036] Step (2): The calcium oxide, anhydrous magnesium sulfate and activated carbon weighed in step (1) are added into a stirrer, and stirred at a speed of 130 revolutions per minute for 20 minutes to obtain a self-heating material.

[0037] Example 4

[0038] A self-heating material, the preparation method comprising the following steps:

[0039] Step (1): 35 parts by weight of calcium oxide, 5 parts by weight of anhydrous magnesium sulfate and 3 parts by weight of activated carbon are weighed respectively;

[0040] Step (2): The calcium oxide, anhydrous magnesium sulfate and activated carbon weighed in step (1) are added into a stirrer, and stirred at a speed of 130 revolutions per minute for 20 minutes to obtain a self-heating material.

[0041] A wet-laid waterproofing membrane is prepared using the self-heating materials prepared in Examples 1-4 respectively, and the specific preparation method comprises the following steps:

[0042] S1: 110 parts by weight of 90# base asphalt is mixed with 47 parts by weight of tackifying filler oil, and heated to 160°C;

[0043] S2: 13 parts by weight of SBR modifier is added to the system of 90# base asphalt and tackifying filler oil, and stirred and dispersed at 500 revolutions per minute, and the temperature is continued to be raised to 180°C;

[0044] S3: 10 parts by weight of SBS modifier is added to the mixed system obtained in S2, and swells at 180°C for 2h to obtain a mixture;

[0045] S4: The mixture obtained in S3 is ground in a disc mill with a mill gap ≤0.15mm for 25-35min, then 6 parts by weight of C9 petroleum resin and 60 parts by weight of 200 mesh talc are added in sequence, and are stirred and mixed at 300 revolutions per minute respectively to obtain a modified asphalt;

[0046] S5: The modified asphalt obtained in S4 is uniformly coated on the lower side of the national standard I type long filament polyester tire base layer to form a lower modified asphalt layer; the modified asphalt obtained in S4 is uniformly coated on the upper side of the national standard I type long filament polyester tire base layer to form an upper modified asphalt layer; an upper anti-adhesion release film is covered on the upper surface of the upper modified asphalt layer, wherein the upper anti-adhesion release film is a PET single-sided silicone release film, and the silicone oil side of the PET single-sided silicone release film faces the upper modified asphalt layer;

[0047] S6: After the lower side modified asphalt layer cools down, remove the moisture on the lower surface of the lower side modified asphalt layer, uniformly spray the self-heating material on the lower surface of the lower side modified asphalt layer to form a self-heating material layer; cover the lower side anti-adhesion release film on the lower surface of the self-heating material layer, and after winding, a self-heating type wet-laid waterproof roll material is obtained, and the lower side anti-adhesion release film is a PET single-side silicone oil release film, and the silicone oil side of the PET single-side silicone oil release film faces the lower side modified asphalt layer.

[0048] The self-heating material of Examples 1-4 is used in an amount of 28 g / m 2 , 26 g / m 2 , 24 g / m 2 , and 22 g / m 2 , respectively.

[0049] Comparative Example 1

[0050] A wet-laid waterproof roll material, and the specific preparation method comprises the following steps:

[0051] S1: 110 parts by weight of 90# base asphalt is mixed with 47 parts by weight of tackifying filler oil, and then heated to 160°C;

[0052] S2: 13 parts by weight of SBR modifier is added to the system of 90# base asphalt and tackifying filler oil, stirred and dispersed at 500 rpm, and continuously heated to 180°C;

[0053] S3: 10 parts by weight of SBS modifier is added to the mixed system obtained in S2, and swelled at 180°C for 2 h to obtain a mixture;

[0054] S4: The mixture obtained in S3 is ground in a disc mill with a mill gap ≤0.15 mm for 25-35 min, then 6 parts by weight of C9 petroleum resin and 60 parts by weight of 200-mesh talc are added, and stirred and mixed at 300 rpm, respectively, to obtain modified asphalt;

[0055] S5: The modified asphalt obtained in S4 is uniformly coated on the lower side of the national standard I type long filament polyester base layer to form a lower side modified asphalt layer; the modified asphalt obtained in S4 is uniformly coated on the upper side of the national standard I type long filament polyester base layer to form an upper side modified asphalt layer; and an upper side anti-adhesion release film is covered on the upper surface of the upper side modified asphalt layer, wherein the upper side anti-adhesion release film is a PET single-side silicone oil release film, and the silicone oil side of the PET single-side silicone oil release film faces the upper side modified asphalt layer;

[0056] S6: After the lower side modified asphalt layer cools down, remove the moisture on the lower surface of the lower side modified asphalt layer, uniformly spray the self-heating material on the lower surface of the lower side modified asphalt layer to form a self-heating material layer; cover the lower side anti-adhesion release film on the lower surface of the self-heating material layer, and after winding, a self-heating type wet-laid waterproof roll material is obtained, and the lower side anti-adhesion release film is a PET single-side silicone oil release film, and the silicone oil side of the PET single-side silicone oil release film faces the lower side modified asphalt layer.

[0057] The wet-laid waterproofing membrane in Example 1-4 and Comparative Example 1 was subjected to performance testing according to GB / T 34576-2017, and the performance testing conditions were as follows:

[0058] Water impermeability: the test pressure was 0.3 MPa, and the test time was 120 min;

[0059] Heat resistance test: the test temperature was 70℃;

[0060] Low-temperature flexibility: the test temperature was -20℃;

[0061] Inter-coat peel strength: the test temperature was room temperature.

[0062] Surface temperature of the wet-laid waterproofing membrane after bonding with a wet base in a low-temperature environment: the test temperature was -5℃, and the test time was 2h, 4h, 6h, 8h, 10h, and 12h.

[0063] Peel strength after bonding with a wet base for 24h in a -5℃ environment: the test temperature was -5℃.

[0064] The test results are shown in Table 1.

[0065] Table 1: Performance test results of the wet-laid waterproofing membrane

[0066]

[0067] As can be seen from the data in Table 1, the self-heating wet-laid waterproofing membrane prepared in Example 1-4 and the wet-laid waterproofing membrane prepared in Comparative Example 1 both meet the standard requirements for wet-laid waterproofing membranes, i.e., water impermeability: no water permeation within 120 min under a pressure of 0.3 MPa; heat resistance: no sliding, flowing, or dripping at 70℃; low-temperature flexibility: ≤-20℃; and inter-coat peel strength: ≥1.0 N / mm. The surface temperature of the self-heating wet-laid waterproofing membrane prepared in Example 1-4 after bonding with a wet base in a -5℃ environment can reach above 17℃ after 2h, indicating that the self-heating wet-laid waterproofing membrane prepared in Example 1-4 can quickly increase in temperature, and the surface temperature of the self-heating wet-laid waterproofing membrane after bonding with a wet base within 2-12h is not lower than the ambient temperature, indicating that the technical solution provided in the present application can greatly improve the bonding performance of the wet-laid waterproofing membrane at low temperatures under the condition that other performance changes are not large, thereby ensuring that the waterproof layer is firmly bonded with the base in cold and humid areas.

[0068] Although the present application has been described in detail with reference to the preferred embodiments, the application is not limited to such but encompasses any modifications or alternatives within the scope of the application as disclosed in the appended claims.

Claims

1. A self-heating type wet-laid waterproofing membrane, characterized by, The modified asphalt layer comprises the following raw materials in mass fraction: 100-120 parts of base asphalt, 40-65 parts of tackifying filler oil, 8-16 parts of SBS modifier, 10-15 parts of SBR modifier, 4-8 parts of C9 petroleum resin, and 50-75 parts of filler. The self-heating material layer is formed by spraying or spattering the self-heating material, which comprises raw materials in the following mass fractions: calcium oxide 20-35 parts, anhydrous magnesium sulfate 5-10 parts, and activated carbon 3-6 parts; the self-heating material is used in an amount of 20-30 g / m 2 ; The modified asphalt layer comprises the following raw materials in mass fraction: 100-120 parts of base asphalt, 40-65 parts of tackifying filler oil, 8-16 parts of SBS modifier, 10-15 parts of SBR modifier, 4-8 parts of C9 petroleum resin, and 50-75 parts of filler.

2. A self-heating type wet-laid waterproof sheet according to claim 1, wherein The preparation method of the self-heating material comprises the following steps: Step (1): calcium oxide, anhydrous magnesium sulfate and activated carbon are weighed according to the proportion respectively; Step (2): the weighed calcium oxide, anhydrous magnesium sulfate and activated carbon in step (1) are added into a stirrer for stirring to obtain the self-heating material.

3. A self-heating type wet-laid waterproof sheet according to claim 2, wherein In step (2), the stirring time is 20-30 minutes, and the stirring speed is 100-150 revolutions per minute.

4. A self-heating type wet-laid waterproof sheet according to claim 1 or 2, wherein The calcium oxide is a 200-mesh powder; the anhydrous magnesium sulfate is a 60-160-mesh powder; and the activated carbon is a 80-mesh powdered wood-based activated carbon.

5. A self-heating type wet-laid waterproof sheet according to claim 1, wherein The filler is at least one of talcum powder, heavy calcium, and bentonite.

6. A method for producing a self-heating type wet-laid waterproof sheet as claimed in any one of claims 1 to 5, characterized by, The method comprises the following steps: S1: after the base asphalt is mixed with the tackifying filler oil, the temperature is raised to 140-160℃; S2: the SBR modifier is added into the system of the base asphalt and the tackifying filler oil, and is stirred and dispersed, and the temperature is continuously raised to 180℃; S3: the SBS modifier is added into the mixed system obtained in S2, and is swelled at 180℃ for 2 hours to obtain a mixture; S4: after the mixture obtained in S3 is ground, the C9 petroleum resin and the filler are added in sequence, and are stirred and mixed respectively to obtain the modified asphalt; S5: the modified asphalt obtained in S4 is uniformly coated on the lower side of the long-filament polyester base layer to form the lower modified asphalt layer; the modified asphalt obtained in S4 is uniformly coated on the upper side of the long-filament polyester base layer to form the upper modified asphalt layer; and the upper anti-adhesion isolation film is covered on the upper surface of the upper modified asphalt layer to obtain the pre-prepared waterproof roll material; S6: after the lower modified asphalt layer is cooled, the water on the lower surface of the lower modified asphalt layer is removed, the self-heating material is uniformly sprayed or sprinkled on the lower surface of the lower modified asphalt layer to form the self-heating material layer; The lower anti-adhesion isolation film is covered on the lower surface of the self-heating material layer, and the self-heating type wet-laid waterproof roll material is obtained after rolling.

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