Quick-repair quick-drying thin coating type polyurethane waterproof material for high-speed railway

Abstract

The invention relates to the technical field of polyurethane, and provides a quick-repair quick-drying thin coating type polyurethane waterproof material for a high-speed railway, which comprises the following components in parts by mass: 300-350 parts of polyether polyol, 160-170 parts of isocyanate, 75-85 parts of color paste, 1-5 parts of a defoaming agent, 15-20 parts of a chain extender, 90-100 parts of an organic solvent, 20-30 parts of modified aluminum hydroxide, 0.3-1 part of a catalyst, 20-40 parts of a curing agent, 5-10 parts of an anti-aging agent and 1-3 parts of a dewatering agent. A modifier in the modified aluminum hydroxide is a substance containing carboxyl and ester groups. Through the technical scheme, the problems of complicated construction, low strength after curing and low elongation at break of a thin coating type polyurethane waterproof material in related technologies are solved.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane, and in particular to a quick-repair, quick-dry, thin-coat polyurethane waterproof material for high-speed railways. Background Art

[0002] At present, the new high-speed railway ballastless track bridge deck waterproofing mainly adopts thin-coat polyurethane waterproofing material, which has the advantages of good impermeability, thin construction thickness, sufficient adhesion with concrete bridge deck, good high and low temperature resistance, good UV aging resistance and chemical corrosion resistance, etc. However, it requires many construction passes, and the strength and elongation at break of the material after curing are low, which limits its use in maintenance to a certain extent. Summary of the invention

[0003] The invention provides a quick-repair and quick-dry thin-coat polyurethane waterproof material for high-speed railways, which solves the problems of cumbersome construction, low strength after curing and low elongation at break of the thin-coat polyurethane waterproof material in the related art.

[0004] The technical solution of the present invention is as follows: The quick-repair, quick-drying, thin-coat polyurethane waterproof material for high-speed railways comprises the following components in parts by weight: 300-350 parts of polyether polyol, 160-170 parts of isocyanate, 75-85 parts of color paste, 1-5 parts of defoaming agent, 15-20 parts of chain extender, 90-100 parts of organic solvent, 20-30 parts of modified aluminum hydroxide, 0.3-1 parts of catalyst, 20-40 parts of curing agent, 5-10 parts of anti-aging agent and 1-3 parts of dewatering agent. The modifier in the modified aluminum hydroxide is a substance containing carboxyl and ester groups.

[0005] The substance containing carboxyl groups and ester groups in the present invention may be any substance containing carboxyl groups and ester groups, preferably monomethyl succinate, monoethyl adipate, monomethyl suberate, methyl hydrogen azelate, more preferably monoethyl adipate, monomethyl suberate.

[0006] As a further technical solution, the isocyanate includes toluene diisocyanate and / or diphenylmethane diisocyanate.

[0007] As a further technical solution, the color paste includes white paste and black paste.

[0008] As a further technical solution, the catalyst includes a T-12 catalyst and a DMDEE catalyst in a mass ratio of 1:9 to 9:1.

[0009] As a further technical solution, the curing agent can be any one or more curing agents in the art, preferably curing agent MS201 and curing agent FT1032.

[0010] As a further technical solution, the anti-aging agent is FT-75 aging agent.

[0011] As a further technical solution, the dehydrating agent is a PI dehydrating agent.

[0012] As a further technical solution, the polyether polyol comprises polyether polyol DL1000D and polyether polyol EP-3600 in a mass ratio of 40:275 to 100:215.

[0013] As a further technical solution, the polyether polyol includes polyether polyol DL1000D and polyether polyol EP-3600 in a mass ratio of 65:250.

[0014] The present invention limits the polyether polyol to polyether polyol DL1000D and polyether polyol EP-3600 in a mass ratio of 65:250, thereby further improving the tensile strength and elongation at break of the thin-coat polyurethane waterproof material.

[0015] As a further technical solution, the number of carbon atoms in the substance containing carboxyl groups and ester groups is 8 to 9.

[0016] The present invention limits the substances containing carboxyl groups and ester groups to substances containing carboxyl groups and ester groups with 8 to 9 carbon atoms, thereby further improving the tensile strength and elongation at break of the thin-coat polyurethane waterproof material.

[0017] As a further technical solution, the substance containing carboxyl groups and ester groups is monoethyl adipate.

[0018] The present invention limits the substance containing carboxyl and ester groups to monoethyl adipate, thereby further improving the tensile strength and elongation at break of the thin-coat polyurethane waterproof material.

[0019] As a further technical solution, the mass ratio of the modifier to the aluminum hydroxide in the modified aluminum hydroxide is 1~5:100.

[0020] As a further technical solution, the mass ratio of the modifier to the aluminum hydroxide in the modified aluminum hydroxide is 3:100.

[0021] The present invention limits the mass ratio of the modifier to the aluminum hydroxide in the modified aluminum hydroxide to 3:100, thereby further improving the tensile strength and elongation at break of the thin-coat polyurethane waterproof material.

[0022] As a further technical solution, the preparation method of the modified aluminum hydroxide comprises the following steps: mixing aluminum hydroxide and a solvent to form a slurry, adding a modifier to modify it, filtering, and drying to obtain the modified aluminum hydroxide.

[0023] As a further technical solution, the mass fraction of the slurry is 5%~10%.

[0024] As a further technical solution, the modification temperature is 40-60°C and the modification time is 30-60 minutes.

[0025] As a further technical solution, the defoaming agent includes FT-3680 defoaming agent and / or FT-301VF defoaming agent.

[0026] As a further technical solution, the chain extender includes FT-6270 chain extender and trimethylolpropane in a mass ratio of 9 to 19:1.

[0027] As a further technical solution, the organic solvent includes one of propylene glycol methyl ether acetate, butyl acetate and a naphthalene-free aromatic solvent.

[0028] As a further technical solution, the naphthalene-free aromatic solvent can be any one or more naphthalene-free aromatic solvents, preferably the naphthalene-free aromatic solvent S-150.

[0029] The working principle and beneficial effects of the present invention are: 1. The addition of aluminum hydroxide in the present invention has the effect of strengthening and toughening the polyurethane waterproof material. At the same time, by using a substance containing carboxyl and ester groups to modify the surface of aluminum hydroxide, the tensile strength and elongation at break of the thin-coat polyurethane waterproof material are improved. This is because: when the surface of aluminum hydroxide is modified, the carboxyl group at one end of the substance containing carboxyl and ester groups can be adsorbed on the surface of aluminum hydroxide, and the ester group at the other end can form a hydrogen bond with the carbamate group in the main chain of the polyurethane, thereby achieving the effect of improving the tensile strength and elongation at break of the thin-coat polyurethane waterproof material.

[0030] 2. The interlayer adhesion of the polyurethane waterproof material provided by the present invention is above 3.0MPa, the UV aging resistance reaches 1500h without cracking or peeling, and the salt spray resistance reaches 1000h without blistering or peeling. This product has achieved technical breakthroughs in tensile strength, elongation at break, UV aging resistance, interlayer adhesion, salt spray resistance, etc., and some parameters have exceeded the foreign technical level.

[0031] 3. The polyurethane waterproof material provided by the present invention is a single component, which is ready to use. It does not require the preparation of all the mixing, metering, batching containers and other utensils of the two-component material. One person can construct it, reducing the number of construction personnel and saving labor costs; and the waterproof layer is reduced to 2 layers. It used to take 3 days to complete the finished product, but now it can be completed in 2 days. In addition, this product is wet-cured. Sudden rainfall during the construction process does not affect the curing of the material. Unlike the two-component material that foams when it encounters water, it is less affected by the weather and is more suitable for maintenance.

[0032] 4. When the polyurethane waterproof material provided by the present invention is used for skylight point construction, the original waterproof layer on the base surface should be scraped off first, and then the base surface should be roughened with a shot blasting machine; after the base surface is treated, the sealing paint should be applied in time, and the sealing paint should fully penetrate the base surface. The dosage should be 0.3~0.4kg / m 2 , can be applied by brushing, spraying, or rolling. The polyurethane waterproof material can be applied after the sealing layer is completely dry or after a 24-hour interval. Before application, foreign matter on the surface to be applied should be removed, and the material should be poured on the surface of the sealing layer and scraped flat with a scraper. It can also be applied by brushing, spraying, or rolling. After the application is completed, check for bubbles. If there are bubbles, remove them and then apply the paint. When the dry film thickness is 600μm, the dosage should be 0.7kg / m 2 After the sealing layer is applied, the longest interval between each coating should not exceed 7 days. If it exceeds 7 days, the surface to be coated should be checked for foreign matter and properly polished before coating, and then the surface should be wiped clean with topcoat thinner. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The parameters of the raw materials in the following examples and comparative examples are as follows: The polyether polyol DL1000D is Bluestar Dongda polyether polyol DL1000D, with a functionality of 2; Polyether polyol EP-3600 is Bluestar Dongda EP-3600 polyether polyol; Aluminum hydroxide is 5000 mesh aluminum hydroxide; FT-75 aging agent, FT-6270 chain extender, FT-3680 defoamer, FT-301VF defoamer, and curing agent FT1032 were purchased from Suzhou Feite Brothers New Material Technology Co., Ltd.; DMDEE catalyst was purchased from Huamao Weiye Green Technology Co., Ltd.; Curing agent MS201 was purchased from Qingdao Desai Ke Trading Co., Ltd.; PI dewatering agent was purchased from Kaifeng Yuanxu Chemical Co., Ltd.; T-12 catalyst was purchased from Tianjin Akeli International Trade Co., Ltd.; JAZ-1 carbon black was purchased from Shandong Huibaichuan New Materials Co., Ltd.; The preparation method of the white slurry is as follows: 190 parts of DuPont R960 titanium dioxide, 100 parts of TXIB plasticizer, and 7 parts of FT-204 dispersant are mixed evenly at 1200 revolutions, and then ground with a sand mill to a fineness of less than 30 μm; The preparation method of the black slurry is as follows: 50 parts of JAZ-1 carbon black, 300 parts of TXIB plasticizer, and 30 parts of FT-201 dispersant are mixed evenly at 1200 revolutions, and then ground with a sand mill to a fineness of less than 30 μm.

[0035] Example 1 S1. After mixing 100 g of aluminum hydroxide with ethanol to form a slurry with a mass fraction of 7%, the mixture was heated to 50° C., 1 g of monomethyl succinate was added while stirring at 2000 r / min for modification for 45 min, filtered, dried, and ground to obtain modified aluminum hydroxide; S2. Place 25 parts of modified aluminum hydroxide, 70 parts of white pulp, 10.5 parts of black pulp, 40 parts of polyether polyol DL1000D, and 275 parts of polyether polyol DL400D in a three-necked flask and dehydrate at 120°C and -0.09MPa for 2h, cool to 80°C, add 162.5 parts of diphenylmethane diisocyanate, 1.5 parts of FT-3680 defoamer, 1.5 parts of FT-301VF defoamer, and 10 parts of propylene glycol methyl ether acetate, keep at 80°C for 2.5h, cool to 45°C, add 17 parts of FT-6270 chain extender, 1.5 parts of trimethylolpropane, and 60 parts of naphthalene-free aromatic solvent S-150, keep constant temperature at 30°C for 1h, add 0.3 parts of T-12 catalyst, 0.3 parts of DMDEE catalyst, 25 parts of propylene glycol methyl ether acetate, and curing agent MS201 30 parts, 8.5 parts of FT-75 aging agent, and 2 parts of PI dewatering agent were kept at 35°C for 30 minutes, and degassed at -0.4MPa for 5 minutes to obtain a polyurethane waterproof material.

[0036] Example 2 S1. After mixing 100 g of aluminum hydroxide with ethanol to form a slurry with a mass fraction of 5%, the mixture was heated to 60°C, and 1 g of monomethyl succinate was added while stirring at 2000 r / min for modification for 30 min. The mixture was filtered, dried, and ground to obtain modified aluminum hydroxide. S2. Place 20 parts of modified aluminum hydroxide, 65 parts of white pulp, 10 parts of black pulp, 30 parts of polyether polyol DL1000D, and 270 parts of polyether polyol DL400D in a three-necked flask and dehydrate at 120°C and -0.09MPa for 2h, cool to 80°C, add 160 parts of diphenylmethane diisocyanate, 1 part of FT-3680 defoamer, and 10 parts of butyl acetate, keep at 80°C for 2.5h, cool to 45°C, add 13.5 parts of FT-6270 chain extender, 1.5 parts of trimethylolpropane, and 55 parts of naphthalene-free aromatic solvent S-150, keep at 30°C for 1h, add 0.03 parts of T-12 catalyst, 0.27 parts of DMDEE catalyst, 25 parts of butyl acetate, and curing agent FT1032. 20 parts, 5 parts of FT-75 aging agent, and 1 part of PI dewatering agent were kept at 35°C for 30 minutes, and degassed at -0.4MPa for 5 minutes to obtain a polyurethane waterproof material.

[0037] Example 3 S1. After mixing 100 g of aluminum hydroxide with ethanol to form a slurry with a mass fraction of 10%, the mixture was heated to 40°C, and 1 g of monomethyl succinate was added while stirring at 2000 r / min for modification for 60 min. The mixture was filtered, dried, and ground to obtain modified aluminum hydroxide. S2. Place 30 parts of modified aluminum hydroxide, 65 parts of white pulp, 20 parts of black pulp, 50 parts of polyether polyol DL1000D, and 300 parts of polyether polyol DL400D in a three-necked flask and dehydrate at 120°C and -0.09MPa for 2h, cool to 80°C, add 170 parts of toluene diisocyanate, 5 parts of FT-301VF defoamer, and 10 parts of butyl acetate, keep at 80°C for 2.5h, cool to 45°C, add 19 parts of FT-6270 chain extender, 1 part of trimethylolpropane, and 60 parts of naphthalene-free aromatic solvent S-150, keep constant temperature at 30°C for 1h, add 9 parts of T-12 catalyst, 1 part of DMDEE catalyst, 30 parts of butyl acetate, and curing agent MS201 40 parts, 10 parts of FT-75 aging agent, and 3 parts of PI dewatering agent were kept at 35°C for 30 minutes, and degassed at -0.4MPa for 5 minutes to obtain a polyurethane waterproof material.

[0038] Example 4 The only difference from Example 1 is that the polyether polyol DL400D is replaced by an equal amount of polyether polyol 330N.

[0039] Example 5 The only difference from Example 1 is that the polyether polyol DL400D is replaced by an equal amount of polyether polyol EP-3600.

[0040] Example 6 The only difference from Example 5 is: 65 parts of polyether polyol DL1000D and 250 parts of polyether polyol EP-3600.

[0041] Example 7 The only difference from Example 5 is: 100 parts of polyether polyol DL1000D and 215 parts of polyether polyol EP-3600.

[0042] Example 8 The only difference from Example 6 is: S1. After mixing 100 g of aluminum hydroxide with water to form a slurry with a mass fraction of 7%, the temperature is raised to 50°C, and 1 g of monoethyl adipate is added while stirring at 2000 r / min for modification for 45 minutes. The mixture is filtered, dried, and ground to obtain modified aluminum hydroxide.

[0043] Example 9 The only difference from Example 6 is: S1. After mixing 100 g of aluminum hydroxide and dimethyl sulfoxide into a slurry with a mass fraction of 7%, the temperature is raised to 50°C, and 1 g of monomethyl suberate is added while stirring at 2000 r / min for modification for 45 minutes. The mixture is filtered, dried, and ground to obtain modified aluminum hydroxide.

[0044] Example 10 The only difference from Example 6 is: S1. After mixing 100 g of aluminum hydroxide and chloroform into a slurry with a mass fraction of 7%, the temperature is raised to 50°C, and 1 g of methyl hydrogen azelaic acid is added while stirring at 2000 r / min for modification for 45 minutes. The mixture is filtered, dried, and ground to obtain modified aluminum hydroxide.

[0045] Embodiment 11 The only difference from Example 8 is: 3 g of monoethyl adipate.

[0046] Example 12 The only difference from Example 8 is: 5 g of monoethyl adipate.

[0047] Comparative Example 1 The only difference from Example 1 is that the modified aluminum hydroxide is replaced by an equal amount of aluminum hydroxide.

[0048] The polyurethane waterproof materials obtained in Examples 1 to 12 and Comparative Example 1 were coated to prepare a film with a thickness of 1.5 mm. The tensile strength and elongation at break were tested according to the method in GB / T 19250-2013 "Polyurethane Waterproof Coating". The test results are recorded in Table 1.

[0049] Table 1 Tensile strength and elongation at break of polyurethane waterproof materials

[0050] It can be seen from Table 1 that the polyurethane waterproof material provided by the present invention has high tensile strength and elongation at break, with a tensile strength of more than 12.0 MPa and an elongation at break of more than 250%, meeting the requirements of technical indicator III in GB / T 19250-2013.

[0051] Compared with Comparative Example 1, the tensile strength and elongation at break of the polyurethane waterproof material obtained by adding aluminum hydroxide modified with substances containing carboxyl groups and ester groups in Example 1 are higher than those in Comparative Example 1, indicating that the tensile strength and elongation at break of the polyurethane waterproof material can be improved after aluminum hydroxide is modified with substances containing carboxyl groups and ester groups.

[0052] The tensile strength and elongation at break of the polyurethane waterproof material obtained in Examples 5 to 7 are higher than those in Example 1 and Example 4, indicating that when the polyether polyol includes polyether polyol DL1000D and polyether polyol EP-3600, the tensile strength and elongation at break of the polyurethane waterproof material can be further improved.

[0053] The tensile strength and elongation at break of the polyurethane waterproof material obtained in Example 6 are higher than those in Example 5 and Example 7, indicating that the mass ratio of polyether polyol DL1000D to polyether polyol EP-3600 is 65:250, which can further improve the tensile strength and elongation at break of the polyurethane waterproof material.

[0054] The tensile strength and elongation at break of the polyurethane waterproof material obtained in Examples 8 to 9 are higher than those in Examples 6 and 10, indicating that the number of carbon atoms in the substance containing carboxyl and ester groups is 8 to 9, which can further improve the tensile strength and elongation at break of the polyurethane waterproof material.

[0055] The tensile strength and elongation at break of the polyurethane waterproof material obtained in Example 8 are higher than those in Example 9, indicating that the substance containing carboxyl and ester groups is monoethyl adipate, which can further improve the tensile strength and elongation at break of the polyurethane waterproof material.

[0056] The tensile strength and elongation at break of the polyurethane waterproof material obtained in Example 11 are higher than those in Example 8 and Example 12, indicating that the mass ratio of the modifier to aluminum hydroxide in the modified aluminum hydroxide is 3:100, which can further improve the tensile strength and elongation at break of the polyurethane waterproof material.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Quick-repair and quick-dry thin-coat polyurethane waterproof material for high-speed railways, characterized in that: The invention comprises the following components in parts by mass: 300-350 parts of polyether polyol, 160-170 parts of isocyanate, 75-85 parts of color paste, 1-5 parts of defoaming agent, 15-20 parts of chain extender, 90-100 parts of organic solvent, 20-30 parts of modified aluminum hydroxide, 0.3-1 parts of catalyst, 20-40 parts of curing agent, 5-10 parts of anti-aging agent and 1-3 parts of dewatering agent. The modifier in the modified aluminum hydroxide is a substance containing carboxyl group and ester group.

2. The quick-repair, quick-drying, thin-coating polyurethane waterproof material for high-speed railway according to claim 1, characterized in that: The polyether polyol includes polyether polyol DL1000D and polyether polyol EP-3600 in a mass ratio of 40:275 to 100:

215.

3. The quick-repair, quick-drying, thin-coating polyurethane waterproof material for high-speed railway according to claim 2, characterized in that: The number of carbon atoms in the substance containing carboxyl groups and ester groups is 8 to 9.

4. The quick-repair, quick-drying, thin-coating polyurethane waterproof material for high-speed railway according to claim 3, characterized in that: The substance containing carboxyl group and ester group is monoethyl adipate.

5. The quick-repair, quick-drying, thin-coating polyurethane waterproof material for high-speed railway according to claim 4, characterized in that: The mass ratio of the modifier to the aluminum hydroxide in the modified aluminum hydroxide is 1 to 5:

100.

6. The quick-repair, quick-drying, thin-coating polyurethane waterproof material for high-speed railway according to claim 5, characterized in that: The preparation method of the modified aluminum hydroxide comprises the following steps: mixing aluminum hydroxide and a solvent to form a slurry, adding a modifier to modify the slurry, filtering, and drying to obtain the modified aluminum hydroxide.

7. The quick-repair, quick-drying, thin-coating polyurethane waterproof material for high-speed railway according to claim 6, characterized in that: The modification temperature is 60-80°C and the modification time is 20-40 minutes.

8. The quick-repair, quick-drying, thin-coating polyurethane waterproof material for high-speed railway according to claim 1, characterized in that: The defoaming agent includes FT-3680 defoaming agent and / or FT-301VF defoaming agent.

9. The quick-repair, quick-drying, thin-coating polyurethane waterproof material for high-speed railway according to claim 1, characterized in that: The chain extender comprises FT-6270 chain extender and trimethylolpropane in a mass ratio of 9 to 19:

1.

10. The quick-repair, quick-drying, thin-coating polyurethane waterproof material for high-speed railway according to claim 1, characterized in that: The organic solvent includes one of propylene glycol methyl ether acetate, butyl acetate and a naphthalene-free aromatic solvent.

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