Asphalt concrete polymer mastic auxiliary impermeable material and preparation method thereof

Abstract

The invention relates to an asphalt concrete polymer mastic auxiliary impermeable material and a preparation method thereof. The components comprise a component A, a component B and a component C, and the component A comprises first polyol, castor oil and isophorone diisocyanate; the component B comprises second polyol, a plasticizer and a catalyst; the component C comprises heavy calcium carbonate; the weight ratio of the component A to the component B to the component C is limited to be 1: (1-2): (2-4), so that the high-temperature resistance and low-temperature resistance of the impermeable material can be improved; the weight ratio of the component A to the component B to the component C is limited to be 1: (1-2): (3-4), the tensile strength of the impermeable material at 80 DEG C is larger than or equal to 3 MPa, and the breaking elongation rate is larger than or equal to 900%; the tensile strength at-80 DEG C is greater than or equal to 10MPa, and the breaking elongation is greater than or equal to 200%.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and specifically, to an asphalt concrete polymer mastic auxiliary anti-seepage material and a preparation method thereof. Background Art

[0002] In cold regions such as Northeast China, Northwest China, and Inner Mongolia, the outdoor temperature can reach -55°C at the coldest time in winter. In the construction of pumped-storage power stations in these regions, a method mainly using high asphalt concrete as the main structure and anti-seepage material is usually adopted. High asphalt concrete is extremely prone to cracking in the low-temperature environment in winter. Therefore, the traditional method is to coat a layer of asphalt mastic on the surface of asphalt concrete as an auxiliary anti-seepage layer. Asphalt mastic can play a good anti-seepage role at normal temperature, but when the summer temperature rises above 80°C, the performance of asphalt mastic will change, becoming soft from solid and starting to flow. And in winter, when the temperature drops below -31°C, this material will become brittle and is easily stretched and brittle fractured.

[0003] Chinese invention patent CN114133872B discloses a rubber asphalt waterproof coating and a preparation method thereof. This application uses terminal epoxy liquid nitrile rubber to modify asphalt. Since the terminal epoxy liquid nitrile rubber has similar polarity to asphalt, it has good compatibility with asphalt. The rubber asphalt waterproof coating prepared therefrom not only has good dispersion uniformity and storage stability before use and will not undergo phase separation, but also can maintain the creep performance of the non-curing material and the bonding performance with asphalt shingles for a long time during application. However, the problem with this invention is that it does not have significant heat resistance, has poor weather resistance in high-temperature environments, and does not explore its applicability in low-temperature environments. Summary of the Invention

[0004] The first aspect of the present invention provides an asphalt concrete polymer mastic auxiliary anti-seepage material, the components of which include component A, component B, and component C. Component A includes: a first polyol, castor oil, and isophorone diisocyanate; component B includes a second polyol, a plasticizer, and a catalyst; component C includes heavy calcium carbonate.

[0005] The weight ratio of component A, component B, and component C is 1:(1 - 2):(2 - 4).

[0006] Optionally, the weight ratio of component A, component B, and component C is 1:(1 - 2):(3 - 4).

[0007] The A component includes a first polyol, castor oil and isophorone diisocyanate; the B component includes a second polyol, a plasticizer and a catalyst; the C component includes heavy calcium carbonate; and it is specified that the weight ratio of the A component, the B component and the C component is 1:(1 - 2):(2 - 4), which can improve the high-temperature resistance (80 °C) and low-temperature resistance (-80 °C) of the anti-seepage material. The polyols in the A component and the B component can form a specific cross-linked polyurethane network structure, which has good elastic recovery at low temperatures. The plasticizer is used to increase the intermolecular slip of the network structure at low temperatures and maintain its anti-seepage performance. The heavy calcium carbonate in the C component, as an inorganic filler, can increase the thermal conductivity of the material, contribute to the dispersion of heat, and cooperate with the heavy calcium carbonate to form a dense microstructure, reducing the internal thermal stress of the material at high temperatures, and jointly improving the heat resistance and low-temperature resistance.

[0008] Both the first polyol and the second polyol include a triol.

[0009] Optionally, the triol includes at least one of polyethylene oxide triol, polytetrahydrofuran triol, polyethylene adipate triol, polybutylene adipate triol, and polyhexylene adipate triol.

[0010] Optionally, the triol includes polyethylene oxide triol.

[0011] The content of the triol in the A component is 20 - 30 wt%, and the content of the triol in the B component is 35 - 50 wt%.

[0012] Optionally, the content of the triol in the A component is 20 - 25 wt%, and the content of the triol in the B component is 40 - 45 wt%.

[0013] The first polyol further includes a diol, and the weight ratio of the diol to the triol in the first polyol is 1:(1.2 - 2).

[0014] Optionally, the first polyol further includes a diol, and the weight ratio of the diol to the triol in the first polyol is 1:(1.2 - 1.8).

[0015] The content of castor oil in the A component is 25 - 35 wt%.

[0016] Optionally, the content of castor oil in the A component is 25 - 30 wt%.

[0017] The diol includes at least one of polypropylene glycol, polyethylene oxide glycol, polytetrahydrofuran glycol, polyhexylene adipate glycol, and polyethylene adipate glycol.

[0018] Optionally, the diol includes polypropylene glycol.

[0019] The catalyst includes stannous octoate and dibutyltin dilaurate, and the weight ratio of stannous octoate to dibutyltin dilaurate is (0.1 - 0.3):(1 - 3).

[0020] Optionally, the weight ratio of stannous octoate to dibutyltin dilaurate is (0.1 - 0.2):(2 - 3).

[0021] The heavy calcium carbonate has a mesh number of 800 - 3000 meshes.

[0022] Optionally, the heavy calcium carbonate has a mesh number of 1000 - 2500 meshes.

[0023] Optionally, the heavy calcium carbonate has a mesh number of 1250 meshes.

[0024] The content of the plasticizer in component B is 45 - 60 wt%.

[0025] Optionally, the content of the plasticizer in component B is 50 - 60 wt%.

[0026] The plasticizer includes chlorinated paraffin plasticizers.

[0027] Optionally, the chlorinated paraffin plasticizers include at least one of chlorinated paraffin - 52, chlorinated paraffin - 70, chlorinated paraffin - 54, and chlorinated paraffin - 68.

[0028] Optionally, the chlorinated paraffin plasticizer includes chlorinated paraffin - 52.

[0029] The second aspect of the present invention provides a preparation method of an asphalt concrete polymer mastic auxiliary anti - seepage material, including the following steps: mixing and dehydrating the first polyol and castor oil, then dropping isophorone diisocyanate for reaction to obtain component A; mixing and dehydrating the second polyol and the plasticizer, then adding the catalyst to obtain component B; preparing heavy calcium carbonate as component C.

[0030] The temperature of the reaction is 70 - 90 °C and the time is 3 - 5 h.

[0031] Optionally, the temperature of the reaction is 80 °C and the time is 4 h.

[0032] Beneficial effects

[0033] 1. Component A includes the first polyol, castor oil and isophorone diisocyanate; component B includes the second polyol, the plasticizer and the catalyst; component C includes heavy calcium carbonate; and the weight ratio of component A, component B and component C is defined as 1:(1 - 2):(2 - 4), which can improve the high - temperature resistance (80 °C) and low - temperature resistance (-80 °C) of the anti - seepage material.

[0034] 2. By limiting the weight ratio of component A, component B, and component C to 1:(1 - 2):(3 - 4), the tensile strength of the anti-seepage material at 80 °C is ≥3 MPa, and the elongation at break is ≥900%; the tensile strength at -80 °C is ≥10 MPa, and the elongation at break is ≥200%.

[0035] 3. Both the first polyol and the second polyol include triol, and it is specified that the content of triol in component A is 20 - 30 wt%, and the content in component B is 35 - 50 wt%. This can improve the bonding strength between the anti-seepage material and asphalt concrete, and at the same time reduce the surface drying and through drying time.

[0036] 4. By limiting the mesh number of heavy calcium carbonate to 800 - 3000 meshes, the hardness, strength, and UV resistance of the anti-seepage material can be increased, and the cost can be reduced at the same time.

[0037] 5. The asphalt concrete polymer mastic auxiliary anti-seepage material prepared by the present invention has no fluidity at 120 °C, meeting the stability requirements of the anti-seepage material for high-temperature use. Detailed implementation mode

[0038] Examples 1 - 3, Comparative examples 1 - 3

[0039] An asphalt concrete polymer mastic auxiliary anti-seepage material is composed of component A, component B, and component C. The specific components are shown in Table 1, where the suppliers and grades of the raw materials in Table 1 are shown in Table 2. The raw material formulas of component A, component B, and component C are calculated according to their respective weight percentages. The weight ratios of component A, component B, and component C in Examples 1 - 3 are 1:1:3, 1:1.5:3.5, and 1:2:4 respectively; the weight ratios of component A, component B, and component C in Comparative examples 1 - 3 are 1:2:1, 1:0.5:1, and 1:0.8:1 respectively.

[0040] Table 1

[0041]

[0042] Table 2

[0043]

[0044]

[0045] A preparation method of an asphalt concrete polymer mastic auxiliary anti-seepage material is as follows:[[]]

[0046] Weighed polypropylene glycol, castor oil, and polyoxypropylene triol were added to the reaction kettle, the stirrer was started, and the temperature was raised to 80°C. The vacuum pump was started to slowly increase the vacuum degree to 0.095 MPa, and the temperature was raised to 120°C and maintained for 2 hours. The temperature was lowered to 80°C, and isophorone diisocyanate was added dropwise. The mixture was stirred and reacted at 80°C under vacuum for 4 hours. When the temperature dropped to 40°C, the mixture was placed in a sealed container under nitrogen protection for later use to obtain component A.

[0047] Add polyether polyol and chlorinated paraffin to the reaction kettle, start the vacuum pump, slowly increase the vacuum degree to 0.095 MPa, raise the temperature to 130°C, stir under vacuum, maintain for 2 hours, lower the temperature to 40°C, add stannous octoate and dibutyltin dilaurate, stir under vacuum for 1 hour, discharge the material, and place it in a sealed container under nitrogen protection for later use to obtain component B;

[0048] Prepare ground calcium carbonate as component C.

[0049] Performance testing methods

[0050] The anti-seepage materials prepared in the examples and comparative examples were sampled (components A, B, and C were mixed uniformly according to the mass ratio and then applied to the asphalt concrete surface with a wet coating thickness of 4 mm and cured at 25°C for 48 hours) and performance tested. The test methods and data are listed in Table 3. The surface setting time and through-drying time were tested after the wet coating thickness was 4 mm, while the remaining tests were performed after curing.

[0051] Performance test data

[0052] Table 3

[0053]

[0054]

[0055]

Claims

1. An asphalt concrete polymer mastic auxiliary anti-seepage material, characterized in that, The components include Component A, Component B and Component C. Component A includes: a first polyol, castor oil and isophorone diisocyanate; Component B includes a second polyol, a plasticizer and a catalyst; Component C includes heavy calcium carbonate; the weight ratio of Component A, Component B and Component C is 1:(1 - 2):(2 - 4).

2. The asphalt concrete polymer mastic auxiliary anti-seepage material according to claim 1, characterized in that, The weight ratio of Component A, Component B and Component C is 1:(1 - 2):(3 - 4).

3. The asphalt concrete polymer mastic auxiliary anti-seepage material according to claim 1, characterized in that, Both the first polyol and the second polyol include a triol.

4. The asphalt concrete polymer mastic auxiliary anti-seepage material according to claim 3, characterized in that, The content of the triol in Component A is 20 - 30 wt%, and the content of the triol in Component B is 35 - 50 wt%.

5. The asphalt concrete polymer mastic auxiliary anti-seepage material according to claim 3 or 4, characterized in that The first polyol further includes a diol, and the weight ratio of the diol to the triol in the first polyol is 1:(1.2 - 2).

6. The asphalt concrete polymer mastic auxiliary anti-seepage material according to claim 5, characterized in that, The content of castor oil in Component A is 25 - 35 wt%.

7. The asphalt concrete polymer mastic auxiliary anti-seepage material according to claim 6, characterized in that, The catalyst includes stannous octoate and dibutyltin dilaurate, and the weight ratio of stannous octoate to dibutyltin dilaurate is (0.1 - 0.3):(1 - 3).

8. The asphalt concrete polymer mastic auxiliary anti-seepage material according to claim 1, characterized in that, The mesh number of the heavy calcium carbonate is 800 - 3000 meshes.

9. The bituminous concrete polymer mastic auxiliary anti-seepage material according to claim 1, characterized in that, The content of the plasticizer in Component B is 45 - 60 wt%, and the plasticizer includes a chlorinated paraffin plasticizer.

10. A method for preparing the asphalt concrete polymer mastic auxiliary anti-seepage material according to any one of claims 1-9, characterized in that, It includes the following steps: mixing the first polyol and castor oil, dehydrating, and then dropping isophorone diisocyanate for reaction to obtain Component A; mixing the second polyol and the plasticizer, dehydrating, and then adding the catalyst to obtain Component B; Preparing heavy calcium carbonate as Component C.

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